//go:build gl

// 年糕历险记 —— 客户端入口（GL 构建）。
//
// 装配顺序：配置/日志 → 尽早 GLFW + Loading（screen=13）→ 图集/世界 → 主循环。
package main

import (
	"context"
	"errors"
	"flag"
	"fmt"
	"image"
	"image/color"
	"image/png"
	"math"
	"os"
	"os/signal"
	"sort"
	"strconv"
	"strings"
	"sync"
	"sync/atomic"
	"time"

	"mc/internal/assets"
	"mc/internal/audio"
	"mc/internal/block"
	"mc/internal/blockentity"
	"mc/internal/camera"
	"mc/internal/chunk"
	"mc/internal/config"
	"mc/internal/crash"
	"mc/internal/engine"
	"mc/internal/entity"
	"mc/internal/game"
	"mc/internal/inventory"
	"mc/internal/item"
	"mc/internal/logx"
	"mc/internal/mesh"
	"mc/internal/netclient"
	"mc/internal/netproto"
	"mc/internal/paths"
	"mc/internal/physics"
	"mc/internal/recipe"
	"mc/internal/render"
	"mc/internal/save"
	"mc/internal/ui"
	"mc/internal/world"
	"mc/internal/worldgen"
)

var devMode = flag.Bool("dev", devDefault, "开发模式：直接读取 assets/（默认随构建 tag）")

// 开发测试参数（dev 测试通过后再打包）
var (
	autoEnter  = flag.Bool("auto", false, "自动进入游戏（跳过主菜单点击）")
	shotPath   = flag.String("shot", "", "截图路径：运行约 2 秒后保存 PNG 并退出（dev 测试用）")
	lookDeg    = flag.Float64("lookdeg", 0, "dev 测试：进游戏后注入一次合成鼠标移动（角度），验证视角跟随链路")
	pitchDeg   = flag.Float64("pitchdeg", 0, "dev 测试：进游戏后把俯仰角直接设置为该值（度）")
	giveItem   = flag.String("give", "", "dev 测试：启动时给热键栏 0 号槽放入 64 个该物品（如 oak_planks/torch）")
	crackStage = flag.Int("crackstage", -1, "dev 测试：截图前把破坏进度视觉设置为该阶段（0–9）")
	spawnTest  = flag.String("spawntest", "", "dev 测试：截图前在视线前方 5 格生成一个实体（zombie/animal/villager）")
	escTest    = flag.Bool("esctest", false, "dev 测试：截图前注入一次 ESC（验证暂停菜单与光标释放链路）")
	craftTest  = flag.Bool("crafttest", false, "dev 测试：截图前打开工作台并预填 2×2 木板（验证合成界面）")
	optTest    = flag.Bool("optionstest", false, "dev 测试：截图前打开设置界面")
	invTest    = flag.Bool("invtest", false, "dev 测试：截图前打开物品栏（E 键界面）并放入若干物品")
	miniDump   = flag.String("minimapdump", "", "dev 诊断：保存一次小地图图像到该路径")
	waterTest  = flag.Bool("underwatertest", false, "dev 测试：截图前置水下渲染状态（验证蓝色叠加）")
	digTest    = flag.Bool("digtest", false, "dev 测试：截图前在视线前方挖一个 2×2×2 的坑（验证挖洞后洞壁光照）")
	swingTest  = flag.Bool("swingtest", false, "dev 测试：截图帧强制手部挥动（验证挖掘挥动动画）")
)

// clientApp 客户端应用：把会话与渲染粘合起来（engine.Ticker + engine.Renderer）。
type clientApp struct {
	sess *game.Session
	rend *render.Renderer
	reg  *block.Registry
	in   *inputState
	uiR  *ui.Renderer
	hud  *ui.HUD

	// 屏幕状态机：0 主菜单 / 1 游戏中 / 2 暂停 / 3 工作台 / 4 设置 / 5 物品栏
	// / 6 选择世界 / 7 创建世界 / 8 熔炉 / 9 箱子 / 10 创造物品栏 / 11 死亡 / 12 交易 / 13 Loading
	screen         int
	titleScreen    *ui.TitleScreen
	pauseScreen    *ui.PauseScreen
	loadingScreen  *ui.LoadingScreen
	deathScreen    *ui.DeathScreen
	tradeScreen    *ui.TradeScreen
	craftScreen    *ui.CraftingScreen
	optionsScr     *ui.OptionsScreen
	invScreen      *ui.InventoryScreen
	furnaceScreen  *ui.FurnaceScreen
	chestScreen    *ui.ChestScreen
	creativeScreen *ui.CreativeScreen
	selectWorld    *ui.SelectWorldScreen
	createWorld    *ui.CreateWorldScreen
	optionsRet     int        // 设置界面的返回屏幕（0 主菜单 / 2 暂停）
	held           item.Stack // 合成界面手持栈（跟随鼠标）
	gameMode       string     // survival / creative
	drag           slotDrag
	lastClickSlot  string
	lastClickAt    time.Time
	uiText         string // book / creative
	lastHotSel     int
	flies          []pickupFly
	armWarned      bool
	audio          *audio.Manager
	am             *assets.Manager
	audioLoaded    bool
	persistOnExit  bool
	saveHintUntil  time.Time
	saveHintTex    uint32
	saveHintW      float32
	saveHintH      float32
	// 设置值（设置界面滑条读写）
	sensVal float64
	volVal  float64

	// 联机（多人同步.md §2：无连接时为单机）
	net  *netclient.Client
	log  *logx.Logger
	lang *assets.Lang

	// 其他玩家位置（多人同步.md §3；渲染插值后置）
	remoteMu      sync.Mutex
	remotePlayers map[uint32][3]float64

	// 世界参数（client.yaml world.seed/name，存档与种子联动）
	worldSeed int64
	worldName string
	viewDist  int
	fov       float64
	items     *item.Registry
	recipes   *recipe.Registry

	clearChunks   atomic.Bool
	uiListDirty   atomic.Bool
	uiCreateDirty atomic.Bool
	retireWorld   *world.World
	lastSlotAt    time.Time
	lastSlot      int

	meshBuilder *mesh.Builder
	uv          func(string) (u0, v0, u1, v1 float32, ok bool)

	mu          sync.Mutex
	pendingMesh []*worldMeshJob // tick 构建 → 渲染线程上传

	// 光标模式请求（-1 无请求 / 0 释放 / 1 捕获）：由 tick 写入、渲染线程消费。
	// GLFW 调用必须发生在主线程（渲染线程），从 tick goroutine 直接调用
	// SetInputMode 属线程违规——症状：ESC 后鼠标仍锁在窗口中心无法自由移动。
	cursorReq atomic.Int32

	// 手持方块（tick 计算 UV → 渲染线程上传，渲染.md §5.2）
	handInit    bool
	handSlot    int
	handHas     bool
	handDirty   bool
	handUVs     [6][4]float32
	handTint    [3]float32 // 手持颜色乘数（空手肤色拳 / 持方块 1,1,1）
	handItemHas bool       // 手持非放置物品（图标四边形，实体图集 UV）
	handItemUV  [4]float32
	swing       float64 // 挥动动画剩余量（左/右键触发，渲染线程衰减）
	swingTimer  float64 // 按住挖掘时周期性挥动的节拍器

	// 水下状态（渲染线程读；tick 更新）
	underwater bool

	// 准星指向方块名（tick 光栅化 CJK → 渲染线程上传，UI还原.md §3.4）
	targetName  string
	targetImg   image.Image
	targetDirty bool

	captionSig   string
	captionImgs  []image.Image
	captionDirty bool

	// 槽位悬停 tooltip（tick 光栅化 CJK → 渲染线程上传）
	tipName  string
	tipImg   image.Image
	tipDirty bool

	// 小地图（tick 生成地表色图 → 渲染线程上传，UI还原.md §3.5）
	miniImg     image.Image
	miniDirty   bool
	blockColors []color.RGBA // 方块 ID → 图集中心色（启动时构建）

	savePool      *save.SavePool
	pendingRemove [][2]int32

	winW, winH int
	guiScale   float32
	menuTime   float64
	spawnY     float64
	tickCnt    uint64
	frames     int // 渲染帧计数（截图时机用）
	lastTime   time.Time

	lookInjected   bool // dev 测试：-lookdeg 已注入
	crackShot      bool // dev 测试：-crackstage 已注入
	spawnShot      bool // dev 测试：-spawntest 已注入
	escShot        bool // dev 测试：-esctest 已注入
	craftShot      bool // dev 测试：-crafttest 已注入
	craftClickShot bool // dev 测试：-crafttest 点击输出格已注入
	optShot        bool // dev 测试：-optionstest 已注入
	invShot        bool // dev 测试：-invtest 已注入
	miniDumped     bool // dev 诊断：-minimapdump 已保存
	waterShot      bool // dev 测试：-underwatertest 已注入
	digShot        bool // dev 测试：-digtest 已注入
}

// worldMeshJob 待上传网格。
type worldMeshJob struct {
	cx, cz int32
	m      *mesh.ChunkMesh
}

// Tick 每 tick（20Hz）：输入 → 玩家 → 会话 → 网格构建（渲染.md §3.3 dirty 重建）。
func (a *clientApp) Tick(dt float64) {
	// 屏幕状态机（UI还原.md §2：主菜单/暂停不处理游戏输入）
	switch a.screen {
	case 0: // 主菜单
		a.in.textMode = false
		a.ensureAudio()
		// dev 测试：-auto 自动进入游戏（跳过点击）
		if *autoEnter {
			a.screen = 1
			a.requestCursor(true)
			return
		}
		if a.in.clicked {
			switch a.titleScreen.HitTest(a.in.clickX, a.in.clickY) {
			case "select":
				a.uiListDirty.Store(true)
				a.screen = 6
			case "play":
				a.screen = 1
				a.requestCursor(true)
			case "options":
				a.screen = 4
				a.optionsRet = 0
			case "multi":
				// 联机：连接本机服务器（多人同步.md §2）
				if err := dialServer(a, "127.0.0.1:25565", "玩家"); err != nil {
					a.logf("连接服务器失败: %v", err)
				} else {
					a.screen = 1
					a.requestCursor(true)
					a.hud.OnlineCount = func() int {
						a.remoteMu.Lock()
						defer a.remoteMu.Unlock()
						return len(a.remotePlayers) + 1 // 含自己
					}
					a.logf("已连接服务器")
				}
			case "quit":
				if a.persistOnExit {
					a.persistWorldWait()
				}
				a.rend.Window().SetShouldClose(true)
			}
			a.in.clicked = false
		}
		a.in.dyaw, a.in.dpitch = 0, 0
		a.tickMenuBackdrop(dt)
		return
	case 2: // 暂停
		if a.in.escPressed {
			a.screen = 1
			a.requestCursor(true)
		}
		if a.in.clicked {
			switch a.pauseScreen.HitTest(a.in.clickX, a.in.clickY) {
			case "resume":
				a.screen = 1
				a.requestCursor(true)
			case "options":
				a.screen = 4
				a.optionsRet = 2
			case "save":
				a.persistWorldWait()
				a.saveHintUntil = time.Now().Add(2 * time.Second)
			case "saveQuit":
				a.persistWorldWait()
				a.screen = 0
				a.requestCursor(false)
			case "quitWorld":
				a.discardWorldToTitle()
			}
			a.in.clicked = false
		}
		a.in.escPressed = false
		return
	case 3: // 工作台（工作台与合成表.md §5：点击槽位交换、ESC 关闭）
		// dev 测试：crafttest 第二阶段——合成输出格（tick 线程，确定性早于截图）
		if *craftTest && !a.craftClickShot {
			a.craftClickShot = true
			a.handleCraftClick("result", false, false)
			a.logf("crafttest 第二阶段: 合成输出格（2×2 木板 → 工作台）")
		}
		a.in.textMode = a.uiText == "book"
		a.applySearchTyping(&a.craftScreen.BookQuery)
		if a.craftScreen.BookOpen {
			if d := a.consumeUIScroll(); d != 0 {
				a.craftScreen.BookScroll += d
				if a.craftScreen.BookScroll < 0 {
					a.craftScreen.BookScroll = 0
				}
			}
		} else {
			a.consumeUIScroll()
		}
		if a.tickSlotUI(dt, &a.craftScreen.OpenT, a.handleCraftClick) {
			a.closeCrafting()
			a.screen = 1
			a.requestCursor(true)
			return
		}
		a.updateSlotTooltip(a.craftHoverName())
		return
	case 4: // 设置（灵敏度/音量滑条 + 按键教程，UI与输入.md §6）
		if a.in.escPressed {
			a.leaveOptions()
			a.in.escPressed = false
			return
		}
		if a.in.clicked {
			switch a.optionsScr.HitTest(a.in.clickX, a.in.clickY) {
			case "sens-":
				a.sensVal = clampFloat(a.sensVal-0.0005, 0.0005, 0.01)
				a.in.SetSensitivity(a.sensVal)
			case "sens+":
				a.sensVal = clampFloat(a.sensVal+0.0005, 0.0005, 0.01)
				a.in.SetSensitivity(a.sensVal)
			case "vol-":
				a.volVal = clampFloat(a.volVal-0.1, 0, 1)
				a.audio.SetVolumes(a.volVal, 1, 1, 1)
			case "vol+":
				a.volVal = clampFloat(a.volVal+0.1, 0, 1)
				a.audio.SetVolumes(a.volVal, 1, 1, 1)
			case "done":
				a.leaveOptions()
			}
			a.in.clicked = false
		}
		return
	case 5: // 物品栏（E 打开，UI还原.md §3.3：27 主区 + 热键栏，点击交换）
		a.consumeUIScroll()
		if a.tickSlotUI(dt, &a.invScreen.OpenT, a.handleInvClick) {
			a.closeInventory()
			a.screen = 1
			a.requestCursor(true)
			return
		}
		a.updateSlotTooltip(a.invHoverName())
		return
	case 8: // 熔炉
		a.consumeUIScroll()
		if a.tickSlotUI(dt, &a.furnaceScreen.OpenT, a.handleFurnaceClick) {
			a.closeContainerUI()
			a.screen = 1
			a.requestCursor(true)
			return
		}
		a.updateSlotTooltip(a.furnaceHoverName())
		return
	case 9: // 箱子
		a.consumeUIScroll()
		if a.tickSlotUI(dt, &a.chestScreen.OpenT, a.handleChestClick) {
			a.closeContainerUI()
			a.screen = 1
			a.requestCursor(true)
			return
		}
		a.updateSlotTooltip(a.chestHoverName())
		return
	case 10: // 创造物品栏
		a.in.textMode = a.uiText == "creative"
		a.applySearchTyping(&a.creativeScreen.Query)
		if d := a.consumeUIScroll(); d != 0 {
			a.creativeScreen.Scroll += d
			if a.creativeScreen.Scroll < 0 {
				a.creativeScreen.Scroll = 0
			}
		}
		if a.tickSlotUI(dt, &a.creativeScreen.OpenT, a.handleCreativeClick) {
			a.returnHeld()
			a.endDrag()
			a.screen = 1
			a.requestCursor(true)
			return
		}
		a.updateSlotTooltip(a.creativeHoverName())
		return
	case 6: // 选择世界（UI还原.md §3.6）
		a.in.textMode = false
		if a.in.escPressed {
			a.screen = 0
			a.selectWorld.Confirm = false
			a.in.escPressed = false
			a.tickMenuBackdrop(dt)
			return
		}
		if a.in.clicked {
			a.handleSelectWorld(a.selectWorld.HitTest(a.in.clickX, a.in.clickY))
			a.in.clicked = false
		}
		a.in.dyaw, a.in.dpitch = 0, 0
		a.tickMenuBackdrop(dt)
		return
	case 7: // 创建世界
		a.in.textMode = true
		if a.in.escPressed {
			a.in.textMode = false
			a.screen = 6
			a.in.escPressed = false
			a.tickMenuBackdrop(dt)
			return
		}
		a.applyCreateTyping()
		if a.in.clicked {
			switch a.createWorld.HitTest(a.in.clickX, a.in.clickY) {
			case "focus-name":
				a.createWorld.Focus = 0
				a.uiCreateDirty.Store(true)
			case "focus-seed":
				a.createWorld.Focus = 1
				a.uiCreateDirty.Store(true)
			case "mode":
				if a.createWorld.GameMode == "creative" {
					a.createWorld.GameMode = "survival"
				} else {
					a.createWorld.GameMode = "creative"
				}
			case "create":
				a.in.textMode = false
				a.finishCreateWorld()
			case "cancel":
				a.in.textMode = false
				a.screen = 6
			}
			a.in.clicked = false
		}
		a.in.dyaw, a.in.dpitch = 0, 0
		a.tickMenuBackdrop(dt)
		return
	case 11: // 死亡（实体系统.md §6：世界继续 Tick）
		a.deathScreen.Cause = a.sess.DeathReason()
		if a.in.clicked {
			switch a.deathScreen.HitTest(a.in.clickX, a.in.clickY) {
			case "respawn":
				a.sess.Respawn()
				a.screen = 1
				a.requestCursor(true)
			case "title":
				a.persistWorldWait()
				a.screen = 0
				a.requestCursor(false)
			}
			a.in.clicked = false
		}
		a.in.escPressed = false
		a.sess.Tick(dt)
		a.flushUnloaded()
		return
	case 12: // 村民交易
		if a.tradeScreen.OpenT < 1 {
			a.tradeScreen.OpenT += float32(dt) * 8
			if a.tradeScreen.OpenT > 1 {
				a.tradeScreen.OpenT = 1
			}
		}
		if a.in.escPressed {
			a.sess.CloseTrade()
			a.screen = 1
			a.requestCursor(true)
			a.in.escPressed = false
			return
		}
		if a.in.clicked {
			slot := a.tradeScreen.HitTest(a.in.clickX, a.in.clickY, float32(a.winW), float32(a.winH), a.guiScale)
			if strings.HasPrefix(slot, "offer") {
				i, _ := strconv.Atoi(slot[5:])
				a.sess.ExecuteTrade(i)
			}
			a.in.clicked = false
		}
		return
	}
	// 游戏中
	if a.sess.IsDead() {
		a.deathScreen.Cause = a.sess.DeathReason()
		a.screen = 11
		a.requestCursor(false)
		a.sess.Tick(dt)
		a.flushUnloaded()
		return
	}
	if a.in.escPressed {
		a.screen = 2
		a.requestCursor(false)
		a.in.escPressed = false
		return
	}
	// E 打开物品栏（创造模式为创造栏）
	if a.in.toggleInv {
		a.in.toggleInv = false
		if a.sess.Creative {
			a.creativeScreen.OpenT = 0
			a.creativeScreen.Query = ""
			a.uiText = ""
			a.screen = 10
		} else {
			a.invScreen.OpenT = 0
			a.screen = 5
		}
		a.requestCursor(false)
		return
	}
	// 挥动动画触发（打击感：左/右键按下时手部挥动）
	if a.in.breakDown || a.in.placeDown {
		a.swing = 1.0
	}
	// 按住挖掘时周期性挥动（原版挖掘节奏，约每 0.3 秒一次）
	if a.in.breakHeld {
		a.swingTimer -= dt
		if a.swingTimer <= 0 {
			a.swingTimer = 0.3
			a.swing = 1.0
		}
	} else {
		a.swingTimer = 0
	}
	a.in.apply(a.sess)
	// 水下检测（相机所在方块为水 → 水下渲染效果）
	a.underwater = a.sess.Player.EyeInWater || *waterTest
	// 右键命中工作台 / 熔炉 / 箱子
	if a.screen == 1 && a.sess.CraftingOpen() {
		a.sess.DiscoverCraftable()
		a.craftScreen.OpenT = 0
		a.screen = 3
		a.requestCursor(false)
		a.logf("打开工作台合成界面")
	}
	if a.screen == 1 && a.sess.ContainerOpen() == 1 {
		a.furnaceScreen.OpenT = 0
		a.screen = 8
		a.requestCursor(false)
		a.logf("打开熔炉")
	}
	if a.screen == 1 && a.sess.ContainerOpen() == 2 {
		a.chestScreen.OpenT = 0
		a.screen = 9
		a.requestCursor(false)
		a.logf("打开箱子")
	}
	if a.screen == 1 && a.sess.TradeOpen() {
		a.tradeScreen.OpenT = 0
		a.screen = 12
		a.requestCursor(false)
		a.logf("打开村民交易")
	}
	if a.sess.Inv.Selected != a.lastHotSel {
		a.lastHotSel = a.sess.Inv.Selected
		a.hud.Punch(a.lastHotSel)
	}
	a.hud.TickAnims(float32(dt))
	a.tickFlies(dt)
	// 手持方块 UV（选中槽变化时重算；渲染线程消费，渲染.md §5.2）
	if !a.handInit || a.sess.Inv.Selected != a.handSlot {
		a.computeHand()
	}
	// dev 测试：注入一次合成鼠标移动（走真实 cursorCallback，验证视角跟随链路）
	if (*lookDeg != 0 || *pitchDeg != 0) && !a.lookInjected {
		a.lookInjected = true
		if *pitchDeg != 0 {
			a.sess.Cam.Pitch = *pitchDeg * math.Pi / 180.0
		}
		if *lookDeg != 0 {
			dx := float64(*lookDeg) * math.Pi / 180.0 / 0.0025             // 目标弧度 → 像素位移
			a.in.cursorCallback(nil, float64(a.winW)/2, float64(a.winH)/2) // 复位基准
			a.in.cursorCallback(nil, float64(a.winW)/2+dx, float64(a.winH)/2)
			a.logf("lookdeg 注入完成: +%.1f° 水平移动", *lookDeg)
		}
	}
	a.sess.Tick(dt)
	a.flushUnloaded()

	// 音频监听器跟随玩家（音频.md §3 距离衰减基准）
	if a.audio != nil {
		a.audio.SetListener(a.sess.Player.Pos[0], a.sess.Player.Pos[1], a.sess.Player.Pos[2], a.sess.Cam.Yaw)
	}
	// 准星指向方块名（每 15 tick 更新；CJK 光栅化在 tick 线程，上传在渲染线程）
	if a.tickCnt%15 == 0 {
		a.updateTargetName()
	}
	a.updateCaptions()
	// 小地图（每 30 tick 重建地表色图，UI还原.md §3.5）
	if a.tickCnt%30 == 0 {
		a.updateMinimap()
	}

	// 联机：上报移动（20Hz，多人同步.md §3）
	if a.net != nil {
		p := a.sess.Player
		a.net.SendMove(netproto.PlayerMove{
			X: float32(p.Pos[0]), Y: float32(p.Pos[1]), Z: float32(p.Pos[2]),
			Yaw: float32(a.sess.Cam.Yaw), Pitch: float32(a.sess.Cam.Pitch),
			OnGround: p.OnGround,
		})
	}

	// 定时存档：30s（存档与持久化.md §2）
	a.tickCnt++
	if a.tickCnt%(20*30) == 0 && a.net == nil {
		a.persistWorld()
	}

	a.rebuildDirtyMeshes(a.sess.Player.Pos[0], a.sess.Player.Pos[2])
}

func (a *clientApp) tickMenuBackdrop(dt float64) {
	a.menuTime += dt
	py := a.spawnY
	if py < 8 {
		py = 80
	}
	a.sess.World.Update(8.5, py, 8.5, 8*time.Millisecond)
	a.flushUnloaded()
	a.rebuildDirtyMeshes(8.5, 8.5)
}

func (a *clientApp) rebuildDirtyMeshes(px, pz float64) {
	start := time.Now()
	type dirtyJob struct {
		c *chunk.Chunk
		d float64
	}
	var dirty []dirtyJob
	for _, c := range a.sess.World.ActiveChunks() {
		if !c.Dirty.Load() {
			continue
		}
		dx := float64(c.CX)*16 + 8 - px
		dz := float64(c.CZ)*16 + 8 - pz
		dirty = append(dirty, dirtyJob{c: c, d: dx*dx + dz*dz})
	}
	sort.Slice(dirty, func(i, j int) bool { return dirty[i].d < dirty[j].d })
	for _, dj := range dirty {
		if time.Since(start) > 6*time.Millisecond {
			break
		}
		a.sess.World.WithReadLock(func() {
			m := a.meshBuilder.Build(dj.c, func(x, y, z int32) block.State {
				return a.sess.World.BlockUnlocked(x, y, z)
			})
			a.mu.Lock()
			a.pendingMesh = append(a.pendingMesh, &worldMeshJob{cx: dj.c.CX, cz: dj.c.CZ, m: m})
			a.mu.Unlock()
		})
		dj.c.Dirty.Store(false)
	}
}

func (a *clientApp) persistWorldWait() {
	a.persistWorld()
	if a.savePool != nil {
		a.savePool.Wait()
	}
}

func (a *clientApp) persistWorld() {
	if a.sess == nil || a.net != nil || !a.persistOnExit {
		return
	}
	pd := a.snapshotPlayer()
	if pd == nil {
		if old, err := save.ReadLevel(paths.Join("worlds"), a.worldName); err == nil && playerPosOK(old.Player) {
			pd = old.Player
		}
	}
	mode := a.gameMode
	if mode == "" {
		mode = "survival"
	}
	lv := save.LevelData{
		Version:       1,
		Seed:          a.worldSeed,
		Time:          int64(a.tickCnt),
		GameMode:      mode,
		Spawn:         a.sess.Spawn,
		Player:        pd,
		BlockEntities: a.sess.ExportBlockEntities(),
	}
	regionDir := paths.Join("worlds", a.worldName, "region")
	if err := save.EnqueueDirty(a.sess.World, a.savePool, regionDir); err != nil {
		a.logf("存档失败: %v", err)
		return
	}
	if lv.Version == 0 {
		lv.Version = 1
	}
	if err := save.WriteLevel(paths.Join("worlds"), a.worldName, lv); err != nil {
		a.logf("存档失败: %v", err)
		return
	}
	a.logf("已保存世界 %s", a.worldName)
}

func (a *clientApp) flushUnloaded() {
	if a.sess == nil {
		return
	}
	regionDir := paths.Join("worlds", a.worldName, "region")
	for _, c := range a.sess.World.DrainUnloaded() {
		if c.SaveDirty.Load() && a.net == nil && a.savePool != nil {
			a.savePool.Enqueue(save.ChunkJob{RegionDir: regionDir, CX: c.CX, CZ: c.CZ, Data: save.EncodeChunk(c)})
			c.SaveDirty.Store(false)
		}
		a.mu.Lock()
		a.pendingRemove = append(a.pendingRemove, [2]int32{c.CX, c.CZ})
		a.mu.Unlock()
	}
}

func (a *clientApp) rasterize(s string, size float64, c color.RGBA) (uint32, float32, float32) {
	cjk := loadCJK(size)
	if cjk == nil || s == "" || a.uiR == nil {
		return 0, 0, 0
	}
	img := cjk.Draw(s, c)
	return a.uiR.UploadImage(img), float32(img.Bounds().Dx()), float32(img.Bounds().Dy())
}

func (a *clientApp) drawSaveHint() {
	if a.uiR == nil || time.Now().After(a.saveHintUntil) {
		return
	}
	if a.saveHintTex == 0 {
		label := "已保存"
		if a.lang != nil {
			if s := a.lang.Get("menu.saved"); s != "menu.saved" {
				label = s
			}
		}
		a.saveHintTex, a.saveHintW, a.saveHintH = a.rasterize(label, 16, color.RGBA{180, 255, 180, 255})
	}
	if a.saveHintTex == 0 {
		return
	}
	w, h := float32(a.winW), float32(a.winH)
	x := w/2 - a.saveHintW/2
	y := h * 0.72
	a.uiR.DrawRect(x-8, y-4, a.saveHintW+16, a.saveHintH+8, [4]float32{0, 0, 0, 0.55})
	a.uiR.DrawImage(a.saveHintTex, x, y, a.saveHintW, a.saveHintH)
}

func (a *clientApp) refreshWorldList() {
	if a.selectWorld == nil {
		return
	}
	list, err := save.ListWorlds(paths.Join("worlds"))
	if err != nil {
		a.logf("列出存档失败: %v", err)
		list = nil
	}
	white := color.RGBA{255, 255, 255, 255}
	gray := color.RGBA{200, 200, 200, 255}
	rows := make([]ui.WorldRow, 0, len(list))
	for _, w := range list {
		mode := w.GameMode
		if a.lang != nil {
			if s := a.lang.Get("world.gameMode." + mode); s != "world.gameMode."+mode {
				mode = s
			}
		}
		label, lw, lh := a.rasterize(w.Name, 16, white)
		meta, mw, mh := a.rasterize(fmt.Sprintf("种子 %d  %s", w.Seed, mode), 12, gray)
		rows = append(rows, ui.WorldRow{
			Name: w.Name, Folder: w.Name, Seed: w.Seed,
			LabelTex: label, LabelW: lw, LabelH: lh,
			MetaTex: meta, MetaW: mw, MetaH: mh,
		})
	}
	a.selectWorld.Rows = rows
	a.selectWorld.Confirm = false
	if a.selectWorld.Selected >= len(rows) {
		a.selectWorld.Selected = len(rows) - 1
	}
	if a.selectWorld.Selected < 0 && len(rows) > 0 {
		a.selectWorld.Selected = 0
	}
}

func (a *clientApp) handleSelectWorld(act string) {
	if strings.HasPrefix(act, "slot:") {
		i, _ := strconv.Atoi(strings.TrimPrefix(act, "slot:"))
		now := time.Now()
		if i == a.selectWorld.Selected && i == a.lastSlot && now.Sub(a.lastSlotAt) < 400*time.Millisecond {
			a.playSelectedWorld()
			return
		}
		a.selectWorld.Selected = i
		a.lastSlot, a.lastSlotAt = i, now
		return
	}
	switch act {
	case "play":
		a.playSelectedWorld()
	case "create":
		a.openCreateWorld()
	case "delete":
		if a.selectWorld.Selected >= 0 && a.selectWorld.Selected < len(a.selectWorld.Rows) {
			a.selectWorld.Confirm = true
		}
	case "cancel":
		a.screen = 0
	case "confirm-yes":
		a.deleteSelectedWorld()
	case "confirm-no":
		a.selectWorld.Confirm = false
	}
}

func (a *clientApp) playSelectedWorld() {
	if a.selectWorld.Selected < 0 || a.selectWorld.Selected >= len(a.selectWorld.Rows) {
		return
	}
	name := a.selectWorld.Rows[a.selectWorld.Selected].Folder
	if name == a.worldName {
		a.persistOnExit = true
		a.screen = 1
		a.requestCursor(true)
		return
	}
	a.persistWorld()
	lv, err := save.ReadLevel(paths.Join("worlds"), name)
	if err != nil {
		a.logf("读存档失败: %v", err)
		return
	}
	a.switchWorld(name, lv.Seed, true, lv.Player)
}

func (a *clientApp) deleteSelectedWorld() {
	if a.selectWorld.Selected < 0 || a.selectWorld.Selected >= len(a.selectWorld.Rows) {
		return
	}
	name := a.selectWorld.Rows[a.selectWorld.Selected].Folder
	if err := save.DeleteWorld(paths.Join("worlds"), name); err != nil {
		a.logf("删除存档失败: %v", err)
		a.selectWorld.Confirm = false
		return
	}
	a.logf("已删除世界 %s", name)
	if name == a.worldName {
		fresh := save.UniqueWorldName(paths.Join("worlds"), "NewWorld")
		a.switchWorld(fresh, time.Now().UnixNano(), false, nil)
		a.screen = 6
		a.requestCursor(false)
	}
	a.uiListDirty.Store(true)
}

func (a *clientApp) openCreateWorld() {
	name := save.UniqueWorldName(paths.Join("worlds"), "新的世界")
	a.createWorld.Name = name
	a.createWorld.Seed = ""
	a.createWorld.Focus = 0
	if a.createWorld.GameMode == "" {
		a.createWorld.GameMode = "survival"
	}
	a.uiCreateDirty.Store(true)
	a.screen = 7
}

func (a *clientApp) refreshCreateFields() {
	white := color.RGBA{255, 255, 255, 255}
	shown := a.createWorld.Name
	if a.createWorld.Focus == 0 {
		shown += "|"
	}
	a.createWorld.NameValTex, a.createWorld.NameValW, a.createWorld.NameValH = a.rasterize(shown, 16, white)
	ss := a.createWorld.Seed
	if ss == "" {
		ss = "（空则随机）"
	}
	if a.createWorld.Focus == 1 {
		ss += "|"
	}
	a.createWorld.SeedValTex, a.createWorld.SeedValW, a.createWorld.SeedValH = a.rasterize(ss, 16, white)
}

func (a *clientApp) applyCreateTyping() {
	changed := false
	if a.in.backspace {
		a.in.backspace = false
		if a.createWorld.Focus == 0 && len(a.createWorld.Name) > 0 {
			r := []rune(a.createWorld.Name)
			a.createWorld.Name = string(r[:len(r)-1])
			changed = true
		} else if a.createWorld.Focus == 1 && len(a.createWorld.Seed) > 0 {
			r := []rune(a.createWorld.Seed)
			a.createWorld.Seed = string(r[:len(r)-1])
			changed = true
		}
	}
	if len(a.in.chars) > 0 {
		for _, ch := range a.in.chars {
			if ch < 32 {
				continue
			}
			if a.createWorld.Focus == 0 && len([]rune(a.createWorld.Name)) < 32 {
				a.createWorld.Name += string(ch)
				changed = true
			} else if a.createWorld.Focus == 1 && len([]rune(a.createWorld.Seed)) < 20 {
				a.createWorld.Seed += string(ch)
				changed = true
			}
		}
		a.in.chars = a.in.chars[:0]
	}
	if changed {
		a.uiCreateDirty.Store(true)
	}
}

func (a *clientApp) finishCreateWorld() {
	dir := paths.Join("worlds")
	name, err := save.SanitizeWorldName(a.createWorld.Name)
	if err != nil {
		name = save.UniqueWorldName(dir, "新的世界")
	} else {
		name = save.UniqueWorldName(dir, name)
	}
	seed := save.ParseWorldSeed(a.createWorld.Seed)
	mode := a.createWorld.GameMode
	if mode == "" {
		mode = "survival"
	}
	a.persistWorld()
	if err := save.WriteLevel(dir, name, save.LevelData{Version: 1, Seed: seed, GameMode: mode}); err != nil {
		a.logf("创建存档失败: %v", err)
		return
	}
	a.gameMode = mode
	a.switchWorld(name, seed, false, nil)
	if a.sess != nil {
		a.sess.Creative = mode == "creative"
	}
}

func (a *clientApp) switchWorld(name string, seed int64, loadExisting bool, player *save.PlayerData) {
	a.replaceWorld(name, seed, loadExisting, player)
}

func (a *clientApp) replaceWorld(name string, seed int64, loadExisting bool, player *save.PlayerData) {
	if a.reg == nil || a.items == nil || a.recipes == nil {
		return
	}
	vd := a.viewDist
	if vd < 2 {
		vd = 8
	}
	gen, err := worldgen.New(a.reg, seed, 0.005, 0.01, 0.1)
	if err != nil {
		a.logf("生成器失败: %v", err)
		return
	}
	w, err := world.New(a.reg, gen, vd)
	if err != nil {
		a.logf("创建世界失败: %v", err)
		return
	}
	if loadExisting {
		if _, err := save.LoadWorld(w, paths.Join("worlds"), name); err != nil {
			a.logf("载入世界失败: %v", err)
		}
	}
	surf := waitSpawnSurface(w)
	p := physics.NewPlayer(8.5, float64(surf+2), 8.5)
	fov := a.fov
	if fov == 0 {
		fov = 70
	}
	cam := camera.New(p.Eye(), 0, -0.35, fov)
	inv := inventory.New(a.items)
	sess := game.NewSession(w, a.reg, a.items, a.recipes, p, inv, cam)
	old := a.sess.World
	a.sess = sess
	a.bindSessionHooks()
	if a.hud != nil {
		a.hud.SetSession(sess)
	}
	a.meshBuilder = newMeshBuilder(a.reg, a.uv, sess)
	a.mu.Lock()
	a.pendingMesh = nil
	a.retireWorld = old
	a.mu.Unlock()
	a.clearChunks.Store(true)
	a.worldName, a.worldSeed = name, seed
	a.spawnY = float64(surf)
	if loadExisting {
		if lv, err := save.ReadLevel(paths.Join("worlds"), name); err == nil {
			a.sess.ImportBlockEntities(lv.BlockEntities)
			a.gameMode = lv.GameMode
			a.sess.Creative = lv.GameMode == "creative"
			if lv.Spawn[1] != 0 {
				a.sess.Spawn = lv.Spawn
			}
			if player == nil {
				player = lv.Player
			}
		}
	} else if a.gameMode == "" {
		a.gameMode = "survival"
	} else {
		a.sess.Creative = a.gameMode == "creative"
	}
	if player != nil {
		a.restorePlayer(player)
	}
	a.lastHotSel = a.sess.Inv.Selected
	a.persistOnExit = true
	a.ensureAudio()
	a.screen = 1
	a.requestCursor(true)
	a.logf("进入世界 %s 种子 %d", name, seed)
}

func (a *clientApp) discardWorldToTitle() {
	if a.sess == nil {
		a.screen = 0
		a.requestCursor(false)
		return
	}
	name, seed := a.worldName, a.worldSeed
	var player *save.PlayerData
	if lv, err := save.ReadLevel(paths.Join("worlds"), name); err == nil {
		player = lv.Player
		seed = lv.Seed
	}
	a.persistOnExit = false
	a.replaceWorld(name, seed, true, player)
	a.persistOnExit = false
	a.screen = 0
	a.requestCursor(false)
	a.logf("已丢弃未保存改动，返回标题")
}

func (a *clientApp) ensureAudio() {
	if a.audioLoaded || a.audio == nil || a.am == nil {
		return
	}
	a.audioLoaded = true
	if jsPath, ok := a.am.ResolveFile("", "sounds", ".json"); ok {
		if raw, err := os.ReadFile(jsPath); err == nil {
			a.audio.LoadSounds(raw, func(name string) (string, bool) {
				return a.am.ResolveFile("sounds", name, ".ogg")
			})
			a.logf("已加载音效事件 %d 个", a.audio.EventCount())
		}
	}
}

func waitSpawnSurface(w *world.World) int32 {
	var surf int32 = 120
	deadline := time.Now().Add(3 * time.Second)
	for time.Now().Before(deadline) {
		w.Update(8.5, 100, 8.5, 8*time.Millisecond)
		if w.Block(8, 80, 8) != block.Air {
			break
		}
		time.Sleep(2 * time.Millisecond)
	}
	for y := int32(255); y > 0; y-- {
		if w.Block(8, y, 8) != block.Air {
			return y
		}
	}
	return surf
}

func playerPosOK(pd *save.PlayerData) bool {
	return pd != nil && pd.Y >= 1
}

func (a *clientApp) snapshotPlayer() *save.PlayerData {
	p := a.sess.Player
	if p.Pos[1] < 1 {
		return nil
	}
	pd := &save.PlayerData{
		X: p.Pos[0], Y: p.Pos[1], Z: p.Pos[2],
		Yaw: a.sess.Cam.Yaw, Pitch: a.sess.Cam.Pitch,
		Health: float64(a.sess.Health), Hunger: a.sess.Hunger,
		Saturation: a.sess.Saturation,
		Selected:   a.sess.Inv.Selected,
	}
	pd.Slots = make([]save.InvSlot, len(a.sess.Inv.Slots))
	for i, st := range a.sess.Inv.Slots {
		pd.Slots[i] = save.InvSlot{Name: st.Name, Count: st.Count, Durability: st.Durability}
	}
	pd.UnlockedRecipes = a.sess.ExportUnlocked()
	return pd
}

func (a *clientApp) restorePlayer(pd *save.PlayerData) {
	if pd == nil {
		return
	}
	if playerPosOK(pd) {
		a.sess.Player.Pos = [3]float64{pd.X, pd.Y, pd.Z}
		a.sess.Cam.Pos = a.sess.Player.Eye()
		a.sess.Cam.Yaw, a.sess.Cam.Pitch = pd.Yaw, pd.Pitch
	} else {
		a.logf("忽略无效玩家坐标 (%.1f, %.1f, %.1f)", pd.X, pd.Y, pd.Z)
	}
	if pd.Health > 0 {
		a.sess.Health = int(pd.Health)
	}
	if pd.Hunger > 0 {
		a.sess.Hunger = pd.Hunger
	}
	a.sess.Saturation = pd.Saturation
	if pd.Selected >= 0 && pd.Selected < 9 {
		a.sess.Inv.Selected = pd.Selected
	}
	for i := 0; i < len(pd.Slots) && i < len(a.sess.Inv.Slots); i++ {
		s := pd.Slots[i]
		a.sess.Inv.Slots[i] = item.Stack{Name: s.Name, Count: s.Count, Durability: s.Durability}
	}
	a.sess.ImportUnlocked(pd.UnlockedRecipes)
}

func (a *clientApp) menuOrbitCam() *camera.Camera {
	sy := a.spawnY
	if sy < 8 {
		sy = 64
	}
	ang := a.menuTime * 0.12
	tx, tz := 8.5, 8.5
	ty := sy + 2
	cx := tx + math.Sin(ang)*22
	cz := tz + math.Cos(ang)*22
	cy := sy + 10
	dx, dy, dz := tx-cx, ty-cy, tz-cz
	yaw := math.Atan2(-dx, -dz)
	pitch := math.Atan2(dy, math.Sqrt(dx*dx+dz*dz))
	return camera.New([3]float64{cx, cy, cz}, yaw, pitch, 70)
}

// injectDevVisuals dev 测试注入（渲染线程，3D 绘制之前调用）：
// -crackstage 设置破坏裂纹阶段（视线前方方块）；-spawntest 生成实体；
// -esctest 注入 ESC（下一 tick 转暂停并请求释放光标）。
func (a *clientApp) injectDevVisuals() {
	if *escTest && !a.escShot {
		a.escShot = true
		a.in.escPressed = true
		a.logf("esctest 注入: ESC 按下（暂停菜单 + 光标释放链路）")
	}
	if *crackStage >= 0 && !a.crackShot {
		a.crackShot = true
		if h, ok := a.sess.Cast(4); ok {
			a.sess.SetBreakVisual(h.X, h.Y, h.Z, float64(*crackStage)/10.0+0.05)
			a.in.breakHeld = true // 防止 tick 的 EndBreak 清掉注入的裂纹视觉
			a.logf("crackstage 注入: 方块(%d,%d,%d) 阶段 %d", h.X, h.Y, h.Z, *crackStage)
		}
	}
	if *spawnTest != "" && !a.spawnShot {
		a.spawnShot = true
		f := a.sess.Cam.Forward()
		ex, ez := int32(a.sess.Player.Pos[0]+f[0]*5), int32(a.sess.Player.Pos[2]+f[2]*5)
		gy := int32(a.sess.Player.Pos[1])
		for ; gy > 0; gy-- {
			if a.sess.World.Block(ex, gy, ez) != block.Air {
				break
			}
		}
		ey := float64(gy + 1)
		switch *spawnTest {
		case "zombie":
			a.sess.Entities.Spawn(entity.KindZombie, float64(ex)+0.5, ey, float64(ez)+0.5)
		case "animal":
			e := a.sess.Entities.Spawn(entity.KindAnimal, float64(ex)+0.5, ey, float64(ez)+0.5)
			e.Data = &entity.Animal{}
		case "villager":
			a.sess.Entities.Spawn(entity.KindVillager, float64(ex)+0.5, ey, float64(ez)+0.5)
		case "drop":
			a.sess.Entities.SpawnDrop("cobblestone", 3, float64(ex)+0.5, ey, float64(ez)+0.5)
		}
		a.logf("spawntest 注入: %s 于 (%d,%d,%d)", *spawnTest, ex, gy+1, ez)
	}
	if *craftTest && !a.craftShot {
		a.craftShot = true
		// 预填 2×2 木板（槽 0/1/3/4）→ 产物为工作台（工作台与合成表.md §5 合成链路）
		for _, i := range []int{0, 1, 3, 4} {
			a.sess.CraftingSwap(i, item.Stack{Name: "oak_planks", Count: 1})
		}
		// 热键栏放 16 木板供界面展示与后续合成
		a.sess.Inv.Slots[0] = item.Stack{Name: "oak_planks", Count: 16}
		a.sess.OpenCrafting()
		a.screen = 3
		a.requestCursor(false)
		a.logf("crafttest 注入: 打开工作台并预填 2×2 木板")
	}
	if *optTest && !a.optShot {
		a.optShot = true
		a.screen = 4
		a.optionsRet = 1
		a.requestCursor(false)
		a.logf("optionstest 注入: 打开设置界面")
	}
	if *invTest && !a.invShot {
		a.invShot = true
		// 放入若干展示物品（工具/方块/掉落物）
		demo := []string{"oak_planks", "crafting_table", "furnace", "torch", "iron_pickaxe", "cobblestone", "beef", "stick", "diamond"}
		for i, name := range demo {
			a.sess.Inv.Slots[i+9] = item.Stack{Name: name, Count: uint8(1 + i*3)}
		}
		a.sess.Inv.Slots[0] = item.Stack{Name: "oak_planks", Count: 32}
		a.screen = 5
		a.requestCursor(false)
		a.logf("invtest 注入: 打开物品栏")
	}
	if *waterTest && !a.waterShot {
		a.waterShot = true
		a.underwater = true
		a.logf("underwatertest 注入: 水下渲染状态")
	}
}

// handleCraftClick 工作台点击：左/右/Shift（工作台与合成表.md §5、UI与输入.md §4）。
func (a *clientApp) handleCraftClick(slot string, right, shift bool) {
	switch {
	case slot == "":
		return
	case slot == "book":
		a.craftScreen.BookOpen = !a.craftScreen.BookOpen
		if !a.craftScreen.BookOpen {
			a.uiText = ""
		}
	case slot == "search":
		a.uiText = "book"
	case strings.HasPrefix(slot, "recipe"):
		var i int
		fmt.Sscanf(slot[6:], "%d", &i)
		list := ui.FilterRecipes(a.sess.Recipes.CraftingRecipes(), a.craftScreen.BookQuery, a.craftScreen.Labels)
		if i >= 0 && i < len(list) && a.sess.RecipeUnlocked(list[i].Result.Item) {
			a.sess.CraftingFillRecipe(list[i])
		}
	case slot == "result":
		if shift {
			a.sess.CraftingTakeResultAll()
			return
		}
		a.takeCraftResult(right)
	case strings.HasPrefix(slot, "grid"):
		i := int(slot[len(slot)-1] - '0')
		if shift && !right {
			a.sess.CraftingShiftGrid(i)
			return
		}
		a.held = a.sess.CraftingClick(i, a.held, right)
	case strings.HasPrefix(slot, "main"), strings.HasPrefix(slot, "hot"):
		idx := a.invIndex(slot)
		if idx < 0 {
			return
		}
		if shift && !right {
			a.sess.CraftingShiftInv(idx)
			return
		}
		a.held = a.sess.Inv.ClickSlot(idx, a.held, right)
	}
}

func (a *clientApp) takeCraftResult(right bool) {
	res, ok := a.sess.CraftingResult()
	if !ok {
		return
	}
	if a.held.Empty() {
		if r, ok := a.sess.CraftingTakeResult(); ok {
			a.held = r
		}
		return
	}
	if a.held.Name != res.Name || a.held.Count >= a.held.Limit(a.sess.Items) {
		return
	}
	if r, ok := a.sess.CraftingTakeResult(); ok {
		merged, remain := inventory.Merge(a.held.Limit(a.sess.Items), a.held, r)
		a.held = merged
		if !remain.Empty() {
			if rem := a.sess.Inv.Add(remain); !rem.Empty() {
				a.sess.Entities.SpawnDrop(rem.Name, int(rem.Count), a.sess.Player.Pos[0], a.sess.Player.Pos[1]+1, a.sess.Player.Pos[2])
			}
		}
	}
	_ = right
}

func (a *clientApp) invIndex(slot string) int {
	var idx int
	switch {
	case strings.HasPrefix(slot, "main"):
		fmt.Sscanf(slot[4:], "%d", &idx)
		return idx + 9
	case strings.HasPrefix(slot, "hot"):
		fmt.Sscanf(slot[3:], "%d", &idx)
		if idx >= 0 && idx < inventory.HotbarSize {
			return idx
		}
	case strings.HasPrefix(slot, "armor"):
		fmt.Sscanf(slot[5:], "%d", &idx)
		if idx >= 0 && idx < 4 {
			return inventory.SlotHelmet + idx
		}
	case slot == "offhand":
		return inventory.SlotOffhand
	}
	return -1
}

// handleInvClick 物品栏点击：存储/盔甲/副手/2×2/输出（UI还原.md §3.3）。
func (a *clientApp) handleInvClick(slot string, right, shift bool) {
	switch {
	case slot == "":
		return
	case slot == "result":
		if shift {
			a.sess.InvCraftTakeResultAll()
			return
		}
		res, ok := a.sess.InvCraftResult()
		if !ok {
			return
		}
		if a.held.Empty() {
			if r, ok := a.sess.InvCraftTakeResult(); ok {
				a.held = r
			}
		} else if a.held.Name == res.Name && a.held.Count < a.held.Limit(a.sess.Items) {
			if r, ok := a.sess.InvCraftTakeResult(); ok {
				merged, remain := inventory.Merge(a.held.Limit(a.sess.Items), a.held, r)
				a.held = merged
				if !remain.Empty() {
					if rem := a.sess.Inv.Add(remain); !rem.Empty() {
						a.sess.Entities.SpawnDrop(rem.Name, int(rem.Count), a.sess.Player.Pos[0], a.sess.Player.Pos[1]+1, a.sess.Player.Pos[2])
					}
				}
			}
		}
	case strings.HasPrefix(slot, "craft"):
		var i int
		fmt.Sscanf(slot[5:], "%d", &i)
		if shift && !right {
			a.sess.InvCraftShift(i)
			return
		}
		a.held = a.sess.InvCraftClick(i, a.held, right)
	default:
		idx := a.invIndex(slot)
		if idx < 0 {
			return
		}
		if shift && !right {
			a.sess.Inv.ShiftFromInv(idx)
			return
		}
		a.held = a.sess.Inv.ClickSlot(idx, a.held, right)
	}
}

// returnHeld 手持栈放回背包（放不下掉落地面）。
func (a *clientApp) returnHeld() {
	if a.held.Empty() {
		return
	}
	if rem := a.sess.Inv.Add(a.held); !rem.Empty() {
		a.sess.Entities.SpawnDrop(rem.Name, int(rem.Count), a.sess.Player.Pos[0], a.sess.Player.Pos[1]+1, a.sess.Player.Pos[2])
	}
	a.held = item.Stack{}
}

// closeCrafting 关闭合成界面：材料退回背包、手持栈放回背包。
func (a *clientApp) closeCrafting() {
	a.sess.CloseCrafting()
	a.returnHeld()
	a.endDrag()
	a.uiText = ""
	a.in.textMode = false
	if a.craftScreen != nil {
		a.craftScreen.BookOpen = false
	}
}

func (a *clientApp) bindSessionHooks() {
	if a.sess == nil {
		return
	}
	if a.audio != nil {
		a.sess.Sound = func(key string, x, y, z float64) { a.audio.Play(key, x, y, z) }
	}
	a.sess.Pickup = func(name string, x, y, z float64, slot int) {
		a.mu.Lock()
		a.flies = append(a.flies, pickupFly{name: name, wx: x, wy: y, wz: z, slot: slot})
		a.mu.Unlock()
	}
	if tbl, err := entity.LoadTrades(paths.Join("assets", "config", "villager_trades.json")); err == nil {
		a.sess.Trades = tbl
	}
}

func (a *clientApp) tickFlies(dt float64) {
	a.mu.Lock()
	n := 0
	for _, f := range a.flies {
		f.age += float32(dt)
		if f.age < 0.4 {
			a.flies[n] = f
			n++
		} else if a.hud != nil {
			a.hud.Punch(f.slot)
		}
	}
	a.flies = a.flies[:n]
	a.mu.Unlock()
}

func (a *clientApp) drawPickupFlies() {
	a.mu.Lock()
	flies := append([]pickupFly(nil), a.flies...)
	a.mu.Unlock()
	if len(flies) == 0 {
		return
	}
	aspect := float64(a.winW) / float64(a.winH)
	view, proj := a.sess.Cam.View(), a.sess.Cam.Projection(aspect, 0.05, 1024)
	w, h := float32(a.winW), float32(a.winH)
	for _, f := range flies {
		t := f.age / 0.4
		if t > 1 {
			t = 1
		}
		sx, sy, ok := projectWorld(view, proj, f.wx, f.wy, f.wz, w, h)
		dx, dy := a.hud.HotbarIconPos(f.slot, w, h)
		x := sx + (dx-sx)*t
		y := sy + (dy-sy)*t
		if !ok {
			x, y = dx, dy
		}
		size := (1.2 - 0.6*t) * a.guiScale
		a.hud.DrawIconAt(a.uiR, f.name, x, y, 16*size)
	}
}

func projectWorld(view, proj [16]float32, x, y, z float64, w, h float32) (sx, sy float32, ok bool) {
	fx, fy, fz := float32(x), float32(y), float32(z)
	vx := view[0]*fx + view[4]*fy + view[8]*fz + view[12]
	vy := view[1]*fx + view[5]*fy + view[9]*fz + view[13]
	vz := view[2]*fx + view[6]*fy + view[10]*fz + view[14]
	vw := view[3]*fx + view[7]*fy + view[11]*fz + view[15]
	cx := proj[0]*vx + proj[4]*vy + proj[8]*vz + proj[12]*vw
	cy := proj[1]*vx + proj[5]*vy + proj[9]*vz + proj[13]*vw
	cw := proj[3]*vx + proj[7]*vy + proj[11]*vz + proj[15]*vw
	if cw <= 0.01 {
		return 0, 0, false
	}
	ndcX, ndcY := cx/cw, cy/cw
	return (ndcX*0.5 + 0.5) * w, (0.5 - ndcY*0.5) * h, true
}

// closeInventory 关闭物品栏：2×2 余料与手持栈退回背包。
func (a *clientApp) closeInventory() {
	a.sess.CloseInvCraft()
	a.returnHeld()
}

// updateTargetName 计算准星指向方块的显示名（lang 本地化 → CJK 光栅化，UI还原.md §3.4）。
// 只在目标变化时重算；CPU 光栅化在 tick 线程，GL 上传由渲染线程消费 targetDirty。
func (a *clientApp) updateTargetName() {
	name := ""
	if h, ok := a.sess.Cast(6); ok {
		name = a.sess.Reg.Name(a.sess.World.Block(h.X, h.Y, h.Z).ID())
	}
	if name == a.targetName {
		return
	}
	a.targetName = name
	a.mu.Lock()
	defer a.mu.Unlock()
	if name == "" {
		a.targetImg = nil
		a.targetDirty = true
		return
	}
	label := name
	if a.lang != nil {
		if s := a.lang.Get("block.minecraft." + name); s != "block.minecraft."+name {
			label = s
		}
	}
	if r := loadCJK(14); r != nil {
		a.targetImg = r.Draw(label, color.RGBA{255, 255, 255, 255})
	}
	a.targetDirty = true
}

func (a *clientApp) updateCaptions() {
	if a.audio == nil {
		return
	}
	caps := a.audio.Captions()
	labels := make([]string, 0, len(caps))
	for _, c := range caps {
		lab := c.Subtitle
		if lab == "" {
			lab = c.Event
		}
		if a.lang != nil {
			if s := a.lang.Get(lab); s != lab {
				lab = s
			}
		}
		labels = append(labels, lab)
	}
	sig := strings.Join(labels, "\n")
	if sig == a.captionSig {
		return
	}
	a.captionSig = sig
	a.mu.Lock()
	defer a.mu.Unlock()
	a.captionImgs = nil
	if r := loadCJK(12); r != nil {
		for _, lab := range labels {
			a.captionImgs = append(a.captionImgs, r.Draw(lab, color.RGBA{230, 230, 230, 255}))
		}
	}
	a.captionDirty = true
}

func (a *clientApp) itemDisplayName(name string) string {
	if name == "" {
		return ""
	}
	if a.lang != nil {
		if s := a.lang.Get("item.minecraft." + name); s != "item.minecraft."+name {
			return s
		}
		if s := a.lang.Get("block.minecraft." + name); s != "block.minecraft."+name {
			return s
		}
	}
	return name
}

func (a *clientApp) stackAtInvHit(slot string) item.Stack {
	switch {
	case slot == "result":
		st, _ := a.sess.InvCraftResult()
		return st
	case strings.HasPrefix(slot, "craft"):
		var i int
		fmt.Sscanf(slot[5:], "%d", &i)
		return a.sess.InvCraftSlot(i)
	default:
		idx := a.invIndex(slot)
		if idx >= 0 && idx < len(a.sess.Inv.Slots) {
			return a.sess.Inv.Slots[idx]
		}
	}
	return item.Stack{}
}

func (a *clientApp) invHoverName() string {
	slot := a.invScreen.HitTest(float32(a.in.cursorX), float32(a.in.cursorY), float32(a.winW), float32(a.winH), a.guiScale)
	return a.stackAtInvHit(slot).Name
}

func (a *clientApp) craftHoverName() string {
	slot := a.craftScreen.HitTest(float32(a.in.cursorX), float32(a.in.cursorY), float32(a.winW), float32(a.winH), a.guiScale)
	switch {
	case slot == "result":
		st, _ := a.sess.CraftingResult()
		return st.Name
	case strings.HasPrefix(slot, "grid"):
		i := int(slot[len(slot)-1] - '0')
		return a.sess.CraftSlot(i).Name
	case strings.HasPrefix(slot, "recipe"):
		var i int
		fmt.Sscanf(slot[6:], "%d", &i)
		list := ui.FilterRecipes(a.sess.Recipes.CraftingRecipes(), a.craftScreen.BookQuery, a.craftScreen.Labels)
		if i >= 0 && i < len(list) {
			return list[i].Result.Item
		}
	default:
		idx := a.invIndex(slot)
		if idx >= 0 && idx < len(a.sess.Inv.Slots) {
			return a.sess.Inv.Slots[idx].Name
		}
	}
	return ""
}

func (a *clientApp) updateSlotTooltip(name string) {
	if name == a.tipName {
		return
	}
	a.tipName = name
	a.mu.Lock()
	defer a.mu.Unlock()
	if name == "" {
		a.tipImg = nil
		a.tipDirty = true
		return
	}
	label := a.itemDisplayName(name)
	if r := loadCJK(12); r != nil {
		a.tipImg = r.Draw(label, color.RGBA{255, 255, 255, 255})
	}
	a.tipDirty = true
}

// leaveOptions 离开设置界面：返回来源屏幕（暂停 → 重新捕获光标）。
func (a *clientApp) leaveOptions() {
	a.screen = a.optionsRet
	if a.optionsRet == 1 || a.optionsRet == 2 {
		a.requestCursor(true)
	}
}

// clampFloat 数值夹取。
func clampFloat(v, lo, hi float64) float64 {
	if v < lo {
		return lo
	}
	if v > hi {
		return hi
	}
	return v
}

// updateMinimap 重建小地图地表色图（96×96 像素 = 玩家周围 96×96 方块）。
// 每列取最上方非空气/非树叶方块的颜色（图集中心色表）；tick 线程 CPU 构建。
func (a *clientApp) updateMinimap() {
	const n = 96
	img := image.NewRGBA(image.Rect(0, 0, n, n))
	px, pz := int32(a.sess.Player.Pos[0]), int32(a.sess.Player.Pos[2])
	half := int32(n / 2)
	sky := color.RGBA{135, 207, 235, 255}
	a.sess.World.WithReadLock(func() {
		for dz := int32(0); dz < n; dz++ {
			wz := pz - half + dz
			for dx := int32(0); dx < n; dx++ {
				wx := px - half + dx
				var s block.State
				for y := int32(200); y >= 0; y-- {
					bs := a.sess.World.BlockUnlocked(wx, y, wz)
					if bs == block.Air {
						continue
					}
					if a.reg.Name(bs.ID()) == "oak_leaves" {
						continue // 树叶透视到地表
					}
					s = bs
					break
				}
				c := sky
				if s != block.Air && int(s.ID()) < len(a.blockColors) {
					c = a.blockColors[s.ID()]
				}
				img.SetRGBA(int(dx), int(dz), c)
			}
		}
	})
	// 玩家标记：烘焙进地图图（中心 3×3 白点 + 黑描边），
	// 避免 UI 批处理下覆盖层 quad 的颜色异常（见 HUD 小地图注释）
	drawMarker := func(cx, cy int) {
		img.SetRGBA(cx-1, cy-1, color.RGBA{0, 0, 0, 255})
		img.SetRGBA(cx, cy-1, color.RGBA{0, 0, 0, 255})
		img.SetRGBA(cx+1, cy-1, color.RGBA{0, 0, 0, 255})
		img.SetRGBA(cx-1, cy, color.RGBA{0, 0, 0, 255})
		img.SetRGBA(cx, cy, color.RGBA{255, 255, 255, 255})
		img.SetRGBA(cx+1, cy, color.RGBA{0, 0, 0, 255})
		img.SetRGBA(cx-1, cy+1, color.RGBA{0, 0, 0, 255})
		img.SetRGBA(cx, cy+1, color.RGBA{0, 0, 0, 255})
		img.SetRGBA(cx+1, cy+1, color.RGBA{0, 0, 0, 255})
	}
	drawMarker(n/2, n/2)
	// dev 诊断：-minimapdump 保存一次地图图
	if *miniDump != "" && !a.miniDumped {
		a.miniDumped = true
		if f, err := os.Create(*miniDump); err == nil {
			_ = png.Encode(f, img)
			_ = f.Close()
			a.logf("minimapdump 已保存: %s", *miniDump)
		}
	}
	a.mu.Lock()
	a.miniImg = img
	a.miniDirty = true
	a.mu.Unlock()
}

// buildBlockColors 构建方块 ID → 图集中心色表（小地图配色，渲染.md §4）。
func buildBlockColors(reg *block.Registry, atlasImg image.Image, uvRects map[string]image.Rectangle) []color.RGBA {
	defs := reg.All()
	out := make([]color.RGBA, len(defs))
	for id := range defs {
		if id == 0 {
			continue
		}
		st := block.NewState(uint16(id), 0)
		key := reg.Texture(st, "up")
		rc, ok := uvRects[key]
		if !ok {
			continue
		}
		cx, cy := rc.Min.X+rc.Dx()/2, rc.Min.Y+rc.Dy()/2
		pr, pg, pb, _ := atlasImg.At(cx, cy).RGBA()
		out[id] = color.RGBA{uint8(pr >> 8), uint8(pg >> 8), uint8(pb >> 8), 255}
	}
	return out
}

// requestCursor 请求切换光标捕获模式（由 tick 写入，渲染线程消费——
// GLFW 调用必须发生在渲染/主线程，UI与输入.md §6）。
func (a *clientApp) requestCursor(captured bool) {
	if captured {
		a.cursorReq.Store(1)
	} else {
		a.cursorReq.Store(0)
	}
}

// computeHand 计算手持方块的六面 UV（选中槽的放置方块）。
// 顺序：顶/底/东/西/南/北（与 render.cubeFaces 一致）。
func (a *clientApp) computeHand() {
	a.handInit = true
	a.handSlot = a.sess.Inv.Selected
	sel := a.sess.Inv.SelectedStack()
	if sel.Empty() {
		a.clearHeldItem()
		return
	}
	d, ok := a.sess.Items.Get(sel.Name)
	if !ok {
		a.clearHeldItem()
		return
	}
	if d.Place != "" {
		a.computeBlockHand(d.Place)
		return
	}
	// 非放置物品（工具/食物等）：实体图集中含全部物品贴图，手持图标四边形
	if uv, found := a.rend.EntityUV(d.Texture); found {
		a.mu.Lock()
		a.handItemHas = true
		a.handItemUV = uv
		a.handHas = false
		a.handDirty = true
		a.mu.Unlock()
		return
	}
	a.clearHeldItem()
}

// computeBlockHand 手持可放置方块：六面贴图立方体（渲染.md §5.2）。
func (a *clientApp) computeBlockHand(place string) {
	bid, ok := a.reg.ID(place)
	if !ok {
		a.clearHeldItem()
		return
	}
	st := block.NewState(bid, 0)
	faces := [6]string{"up", "down", "side", "side", "side", "side"}
	var uvs [6][4]float32
	for i, f := range faces {
		u0, v0, u1, v1, found := a.uv(a.reg.Texture(st, f))
		if !found {
			u0, v0, u1, v1 = 0, 0, 1, 1
		}
		uvs[i] = [4]float32{u0, v0, u1, v1}
	}
	a.mu.Lock()
	a.handUVs = uvs
	a.handHas = true
	a.handItemHas = false
	a.handTint = [3]float32{1, 1, 1}
	a.handDirty = true
	a.mu.Unlock()
}

// newMeshBuilder 创建网格构建器：面光照取邻格光照（原版光照模型，
// 光照.md 顶点光照——方块自身 sky=0，用自身光照会让悬崖/矿洞立面全黑）。
func newMeshBuilder(reg *block.Registry, uvFn func(string) (u0, v0, u1, v1 float32, ok bool), sess *game.Session) *mesh.Builder {
	b := mesh.NewBuilder(reg, uvFn)
	b.SetLight(func(x, y, z int32) (uint8, uint8) {
		return sess.World.SkyLightUnlocked(x, y, z), sess.World.BlockLightUnlocked(x, y, z)
	})
	return b
}

// clearHeldItem 空手：只画皮肤手臂，不再铺白羊毛拳头（渲染.md §5.2）。
func (a *clientApp) clearHeldItem() {
	a.mu.Lock()
	a.handHas = false
	a.handItemHas = false
	a.handDirty = true
	a.mu.Unlock()
}

// integerGUIScale 按窗口像素取 1–4 整数缩放（UI还原.md §3.1：427×240 基准）。
func integerGUIScale(w, h int) float32 {
	s := w / 427
	if h/240 < s {
		s = h / 240
	}
	if s < 1 {
		s = 1
	}
	if s > 4 {
		s = 4
	}
	return float32(s)
}

// applyResize 同步 viewport 之后的 UI / 投影尺寸（渲染.md §5.4）。
func (a *clientApp) applyResize(w, h int) {
	if w < 1 {
		w = 1
	}
	if h < 1 {
		h = 1
	}
	a.winW, a.winH = w, h
	a.guiScale = integerGUIScale(w, h)
	if a.uiR != nil {
		a.uiR.Resize(w, h, a.guiScale)
	}
	if a.hud != nil {
		a.hud.SetScale(a.guiScale)
	}
	if a.titleScreen != nil {
		a.titleScreen.Layout(float32(w), float32(h), a.guiScale)
	}
	if a.pauseScreen != nil {
		a.pauseScreen.Layout(float32(w), float32(h), a.guiScale)
	}
	if a.deathScreen != nil {
		a.deathScreen.Layout(float32(w), float32(h), a.guiScale)
	}
	if a.selectWorld != nil {
		a.selectWorld.Layout(float32(w), float32(h), a.guiScale)
	}
	if a.createWorld != nil {
		a.createWorld.Layout(float32(w), float32(h), a.guiScale)
	}
	if a.optionsScr != nil {
		a.optionsScr.Layout(float32(w))
	}
}

// Render 每帧渲染（渲染线程）：上传待传网格 → 视图矩阵 → 三 pass 绘制。
func (a *clientApp) Render() {
	if a.in.toggleFS {
		a.in.toggleFS = false
		a.rend.ToggleFullscreen()
	}
	// 消费光标模式请求（主线程执行 GLFW 调用）
	if req := a.cursorReq.Load(); req >= 0 {
		a.rend.SetCursorMode(req == 1)
		if req == 1 {
			// 重新捕获：光标跳回窗口中心，重置基准防视角瞬跳（UI与输入.md §6）
			a.in.lastX, a.in.lastY = float64(a.winW)/2, float64(a.winH)/2
			a.in.firstMouse = true
		}
		a.cursorReq.Store(-1)
	}
	if a.uiListDirty.CompareAndSwap(true, false) {
		a.refreshWorldList()
	}
	if a.uiCreateDirty.CompareAndSwap(true, false) {
		a.refreshCreateFields()
	}
	if a.clearChunks.CompareAndSwap(true, false) {
		a.rend.ClearAllChunks()
		a.mu.Lock()
		old := a.retireWorld
		a.retireWorld = nil
		a.mu.Unlock()
		if old != nil {
			old.Close()
		}
	}
	a.mu.Lock()
	rm := a.pendingRemove
	a.pendingRemove = nil
	a.mu.Unlock()
	for _, p := range rm {
		a.rend.RemoveChunk(p[0], p[1])
	}
	// dev 测试：挖坑类测试提前注入（留足网格重建时间）；其余截图前注入
	if a.frames == 100 && *digTest && !a.digShot {
		a.digShot = true
		if h, ok := a.sess.Cast(5); ok {
			for dy := int32(0); dy < 2; dy++ {
				for dx := int32(-1); dx <= 1; dx++ {
					for dz := int32(-1); dz <= 1; dz++ {
						a.sess.World.SetBlock(h.X+dx, h.Y-dy, h.Z+dz, block.Air)
					}
				}
			}
			a.logf("digtest 注入: 挖坑 (%d,%d,%d)", h.X, h.Y, h.Z)
		}
	}
	// dev 测试：截图前注入破坏裂纹/实体/ESC/工作台/设置/物品栏/水下/挖坑（必须在 3D 绘制之前，截图帧才能拍到）
	if a.frames == 195 && (*crackStage >= 0 || *spawnTest != "" || *escTest || *craftTest || *optTest || *invTest || *waterTest) {
		a.injectDevVisuals()
	}
	// 上传 tick 构建好的网格（GL 调用必须在渲染线程）
	a.mu.Lock()
	pending := a.pendingMesh
	a.pendingMesh = nil
	a.mu.Unlock()
	for _, j := range pending {
		a.rend.UploadChunk(j.cx, j.cz, j.m)
		mesh.Release(j.m) // 上传完毕归还顶点池（性能与内存.md §2）
	}

	// 清屏 + 绘制（视锥剔除简化为全量绘制，后置 LOD）
	a.rend.BeginFrame()
	fw, fh := a.rend.FramebufferSize()
	if fw != a.winW || fh != a.winH {
		a.applyResize(fw, fh)
	}
	cam := a.sess.Cam
	if a.screen == 0 || a.screen == 6 || a.screen == 7 {
		cam = a.menuOrbitCam()
	}
	aspect := float64(a.winW) / float64(a.winH)
	a.rend.SetViewProj(cam.View(), cam.Projection(aspect, 0.05, 1024))
	chunks := a.sess.World.ActiveChunks()
	a.rend.DrawChunks(func(i int) (int32, int32) { return chunks[i].CX, chunks[i].CZ }, len(chunks))

	// 实体绘制（渲染.md §5.3：动物/人形盒模型；掉落物广告牌）
	for _, e := range a.sess.Entities.List() {
		if e.Dead {
			continue
		}
		key, h, variant := entityVisual(e, a.sess.Items)
		if key == "" {
			continue
		}
		if variant >= 0 {
			uv, ok := firstUV(a.rend, animalSkinKeys(variant)...)
			if !ok {
				uv, ok = a.rend.EntityUV("entity/missing")
			}
			if ok {
				yaw := float32(e.Yaw)
				a.rend.DrawAnimalModel(float32(e.Pos[0]), float32(e.Pos[1]), float32(e.Pos[2]), yaw, render.AnimalModelByVariant(variant), uv, e.HitFlash > 0)
				if variant == 2 {
					if fur, furOK := firstUV(a.rend, "entity/sheep/sheep_fur", "entity/sheep/sheep_wool"); furOK {
						a.rend.DrawAnimalModel(float32(e.Pos[0]), float32(e.Pos[1]), float32(e.Pos[2]), yaw, render.SheepWoolModel(), fur, e.HitFlash > 0)
					}
				}
			}
			continue
		}
		uv, ok := a.rend.EntityUV(key)
		if !ok {
			uv, ok = a.rend.EntityUV("entity/missing")
		}
		if !ok {
			continue
		}
		if e.Kind == entity.KindItemDrop {
			a.rend.DrawBillboard(float32(e.Pos[0]), float32(e.Pos[1]), float32(e.Pos[2]), h, h, uv, false)
		} else {
			a.rend.DrawAnimalModel(float32(e.Pos[0]), float32(e.Pos[1]), float32(e.Pos[2]), float32(e.Yaw), render.HumanoidModel(), uv, e.HitFlash > 0)
		}
	}

	// 破坏裂纹叠加（方块交互与动画.md §4：progress→destroy_stage 0–9）
	if a.screen == 1 {
		if prog := a.sess.BreakProgress(); prog > 0 {
			t := a.sess.BreakTarget()
			a.rend.DrawCrackOverlay(float32(t.X), float32(t.Y), float32(t.Z), int(prog*10))
		}
	}
	// 手持方块上传与绘制（渲染.md §5.2；上传必须是渲染线程）
	// 挥动动画：左/右键后手部斜向下摆，逐帧重传立方体
	if *swingTest && a.frames >= 198 {
		a.swing = 1.0 // dev 测试：截图帧强制挥动
	}
	if a.swing > 0 {
		a.swing -= 0.12
		if a.swing < 0 {
			a.swing = 0
		}
	}
	a.mu.Lock()
	handHas := a.handHas
	handItemHas, handItemUV := a.handItemHas, a.handItemUV
	var handUVs [6][4]float32
	if handHas {
		handUVs = a.handUVs
	}
	a.handDirty = false
	a.mu.Unlock()
	if a.screen == 1 {
		armUV, hasSkin := firstUV(a.rend, "entity/player/wide/steve", "entity/steve")
		if !hasSkin && !a.armWarned {
			a.armWarned = true
			a.logf("WARN 玩家皮肤缺失（entity/player/wide/steve、entity/steve），第一人称手臂使用肤色回退")
		}
		a.rend.DrawFirstPerson(armUV, hasSkin, float32(a.swing), handUVs, handHas, handItemUV, handItemHas)
	}

	// 准星指向方块名上传（tick 光栅化 → 渲染线程上传，UI还原.md §3.4）
	a.mu.Lock()
	targetDirty, targetImg := a.targetDirty, a.targetImg
	a.targetDirty = false
	a.mu.Unlock()
	if targetDirty {
		if targetImg != nil {
			tex := a.uiR.UploadImage(targetImg)
			a.hud.SetTarget(tex, float32(targetImg.Bounds().Dx()), float32(targetImg.Bounds().Dy()), a.targetName)
		} else {
			a.hud.SetTarget(0, 0, 0, "")
		}
	}
	a.mu.Lock()
	tipDirty, tipImg := a.tipDirty, a.tipImg
	a.tipDirty = false
	a.mu.Unlock()
	if tipDirty {
		if tipImg != nil {
			tex := a.uiR.UploadImage(tipImg)
			tw, th := float32(tipImg.Bounds().Dx()), float32(tipImg.Bounds().Dy())
			a.invScreen.SetTooltip(tex, tw, th)
			a.craftScreen.SetTooltip(tex, tw, th)
			if a.furnaceScreen != nil {
				a.furnaceScreen.SetTooltip(tex, tw, th)
			}
			if a.chestScreen != nil {
				a.chestScreen.SetTooltip(tex, tw, th)
			}
			if a.creativeScreen != nil {
				a.creativeScreen.SetTooltip(tex, tw, th)
			}
		} else {
			a.invScreen.SetTooltip(0, 0, 0)
			a.craftScreen.SetTooltip(0, 0, 0)
			if a.furnaceScreen != nil {
				a.furnaceScreen.SetTooltip(0, 0, 0)
			}
			if a.chestScreen != nil {
				a.chestScreen.SetTooltip(0, 0, 0)
			}
			if a.creativeScreen != nil {
				a.creativeScreen.SetTooltip(0, 0, 0)
			}
		}
	}

	a.mu.Lock()
	capDirty, capImgs := a.captionDirty, a.captionImgs
	a.captionDirty = false
	a.mu.Unlock()
	if capDirty {
		var tex []uint32
		var cw, ch []float32
		for _, img := range capImgs {
			if img == nil {
				continue
			}
			tex = append(tex, a.uiR.UploadImage(img))
			b := img.Bounds()
			cw = append(cw, float32(b.Dx()))
			ch = append(ch, float32(b.Dy()))
		}
		a.hud.SetCaptions(tex, cw, ch)
	}

	// 小地图上传（tick 生成地表色图 → 渲染线程上传，UI还原.md §3.5）
	a.mu.Lock()
	miniDirty, miniImg := a.miniDirty, a.miniImg
	a.miniDirty = false
	a.mu.Unlock()
	if miniDirty && miniImg != nil {
		a.hud.SetMinimap(a.uiR.UploadImage(miniImg))
	}

	// UI pass（UI与输入.md §2：3D 之后、状态隔离）
	a.uiR.Begin()
	a.hud.SetUnderwater(a.underwater)
	mx, my := float32(a.in.cursorX), float32(a.in.cursorY)
	switch a.screen {
	case 0:
		a.titleScreen.SetWorldBg(true)
		a.titleScreen.Draw(a.uiR, mx, my)
	case 1:
		a.hud.Draw(a.uiR)
		a.drawPickupFlies()
	case 2:
		a.hud.Draw(a.uiR) // 暂停时世界仍可见（UI还原.md §2）
		a.pauseScreen.Draw(a.uiR, mx, my)
		a.drawSaveHint()
	case 13:
		if a.loadingScreen != nil {
			a.loadingScreen.Draw(a.uiR)
		}
	case 11:
		a.hud.Draw(a.uiR)
		a.deathScreen.Cause = a.sess.DeathReason()
		a.deathScreen.Draw(a.uiR, mx, my)
	case 12:
		a.tradeScreen.Draw(a.uiR, a.sess.TradeOffers(), mx, my, a.guiScale)
	case 3: // 工作台合成界面（UI还原.md §3.4）
		var grid [9]item.Stack
		for i := range grid {
			grid[i] = a.sess.CraftSlot(i)
		}
		res, hasRes := a.sess.CraftingResult()
		a.craftScreen.Draw(a.uiR, grid, res, hasRes, a.sess.Inv.Slots, a.held, a.sess.Recipes.CraftingRecipes(), a.sess.Unlocked, mx, my, a.guiScale)
	case 4: // 设置界面
		a.optionsScr.Draw(a.uiR, mx, my, float32(a.sensVal/0.01), float32(a.volVal))
	case 5: // 物品栏界面
		var cg [4]item.Stack
		for i := range cg {
			cg[i] = a.sess.InvCraftSlot(i)
		}
		ires, ihas := a.sess.InvCraftResult()
		a.invScreen.Draw(a.uiR, a.sess.Inv.Slots, cg, ires, ihas, a.held, mx, my, a.guiScale)
	case 8:
		be := a.sess.ContainerEntity()
		var in, fuel, out item.Stack
		var burn, cook float32
		if be != nil && len(be.Slots) > 2 {
			in, fuel, out = be.Slots[1], be.Slots[0], be.Slots[2]
			if be.BurnMaxTicks > 0 {
				burn = float32(be.BurnTicks) / float32(be.BurnMaxTicks)
			}
			cook = float32(be.CookTicks) / float32(blockentity.CookTime)
		}
		a.furnaceScreen.Draw(a.uiR, in, fuel, out, burn, cook, a.sess.Inv.Slots, a.held, mx, my, a.guiScale)
	case 9:
		var box []item.Stack
		if be := a.sess.ContainerEntity(); be != nil {
			box = be.Slots
		}
		a.chestScreen.Draw(a.uiR, box, a.sess.Inv.Slots, a.held, mx, my, a.guiScale)
	case 10:
		a.creativeScreen.Draw(a.uiR, a.sess.Inv.Slots, a.held, mx, my, a.guiScale)
	case 6:
		a.titleScreen.SetWorldBg(true)
		a.selectWorld.Draw(a.uiR, mx, my)
	case 7:
		a.titleScreen.SetWorldBg(true)
		a.createWorld.Draw(a.uiR, mx, my)
	}
	a.uiR.Flush()
	a.rend.EndFrame()

	// 截图（dev 测试：游戏内等玩家所在区块 5×5 网格就绪再拍，避免视野空洞导致误判）
	a.frames++
	if *shotPath != "" && a.frames >= 200 {
		ready := a.screen != 1 // 非游戏画面（标题/暂停）无需等区块
		if !ready {
			ready = true
			pcx, pcz := int32(a.sess.Player.Pos[0])>>4, int32(a.sess.Player.Pos[2])>>4
			for cx := pcx - 2; cx <= pcx+2 && ready; cx++ {
				for cz := pcz - 2; cz <= pcz+2; cz++ {
					if !a.rend.HasChunk(cx, cz) {
						ready = false
						break
					}
				}
			}
		}
		if ready || a.frames > 2400 { // 就绪即拍；48 秒兜底
			if !ready {
				a.logf("截图兜底：视野未完全就绪（frame=%d）", a.frames)
			}
			a.logf("shot cam: pos=%v yaw=%.2f pitch=%.2f chunks=%d", a.sess.Cam.Pos, a.sess.Cam.Yaw, a.sess.Cam.Pitch, len(a.sess.World.ActiveChunks()))
			if err := a.saveScreenshot(*shotPath); err != nil {
				a.logf("截图失败: %v", err)
			} else {
				a.logf("截图已保存: %s", *shotPath)
			}
			a.rend.Window().SetShouldClose(true)
		}
	}
}

// ShouldClose 窗口关闭判定。
func (a *clientApp) ShouldClose() bool { return a.rend.ShouldClose() }

// logf 客户端日志（联机回调使用）。
func (a *clientApp) logf(format string, args ...any) {
	if a.log != nil {
		a.log.Infof(format, args...)
	}
}

func main() {
	crash.SetLogPath(paths.Join("logs", "crash.log"))
	defer crash.Guard(paths.Join("logs", "crash.log"))
	flag.Parse()

	log, err := logx.NewFile(paths.Join("logs", "client.log"), logx.LevelInfo)
	if err != nil {
		panic(err)
	}
	cfg, err := config.Load(paths.Join("config", "client.yaml"), config.DefaultClient())
	if err != nil {
		log.Warnf("配置加载失败，使用默认值：%v", err)
	}
	log.Infof("%s 客户端启动：%dx%d，语言 %s，视距 %d", cfg.Client.WindowTitle, cfg.Client.WindowWidth, cfg.Client.WindowHeight, cfg.Client.Language, cfg.Client.RenderDistance)

	app, err := bootClient(log, cfg)
	if err != nil {
		if errors.Is(err, errBootClosed) {
			log.Infof("启动中关闭窗口")
			return
		}
		panic(err)
	}
	defer app.rend.Shutdown()
	defer app.audio.Close()
	if app.sess != nil && app.sess.World != nil {
		defer app.sess.World.Close()
	}

	ctx, stop := signal.NotifyContext(context.Background(), os.Interrupt)
	defer stop()
	log.Infof("进入游戏主循环")
	engine.Run(ctx, app, app)
	if app.persistOnExit {
		app.persistWorldWait()
	}
	app.savePool.Close()
	log.Infof("客户端已退出")
}