package game

import (
	"math"
	"mc/internal/blockentity"
	"path/filepath"
	"testing"
	"time"

	"mc/internal/block"
	"mc/internal/camera"
	"mc/internal/entity"
	"mc/internal/inventory"
	"mc/internal/item"
	"mc/internal/physics"
	"mc/internal/recipe"
	"mc/internal/world"
	"mc/internal/worldgen"
)

// newTestSession 构造真实世界上的游戏会话（等待区块生成）。
func newTestSession(t *testing.T) *Session {
	t.Helper()
	reg, err := block.Load(filepath.Join("..", "..", "assets", "config", "blocks.json"))
	if err != nil {
		t.Fatalf("加载方块注册表失败: %v", err)
	}
	items, err := item.Load(filepath.Join("..", "..", "assets", "config", "items.json"))
	if err != nil {
		t.Fatalf("加载物品注册表失败: %v", err)
	}
	recipes, err := recipe.Load(filepath.Join("..", "..", "assets", "config", "recipes.json"))
	if err != nil {
		t.Fatalf("加载配方失败: %v", err)
	}
	gen, err := worldgen.New(reg, 42, 0.005, 0.01, 0.1)
	if err != nil {
		t.Fatalf("创建生成器失败: %v", err)
	}
	w, err := world.New(reg, gen, 3)
	if err != nil {
		t.Fatalf("创建世界失败: %v", err)
	}
	t.Cleanup(w.Close)

	// 等待 (0,0) 区块
	deadline := time.Now().Add(15 * time.Second)
	for time.Now().Before(deadline) {
		w.Update(8, 64, 8, 8*time.Millisecond)
		if w.Block(8, 0, 8) != block.Air {
			break
		}
		time.Sleep(2 * time.Millisecond)
	}
	// 找地表
	var surf int32
	for y := int32(255); y >= 0; y-- {
		if w.Block(8, y, 8) != block.Air {
			surf = y
			break
		}
	}
	p := physics.NewPlayer(8.5, float64(surf+1), 8.5)
	cam := camera.New(p.Eye(), 0, -math.Pi/2, 70)
	inv := inventory.New(items)
	inv.Slots[0] = item.Stack{Name: "diamond_pickaxe", Count: 1} // 选中的工具
	inv.Slots[1] = item.Stack{Name: "oak_planks", Count: 10}
	sess := NewSession(w, reg, items, recipes, p, inv, cam)
	// 测试环境禁用自然刷怪（僵尸生成依赖区块加载时序，会造成 flake）
	sess.spawnTimer = 1e9
	return sess
}

// TestBreakAndPlace 完整闭环：破坏地表 → 放木板（方块交互与动画.md §3、§6）。
func TestBreakAndPlace(t *testing.T) {
	s := newTestSession(t)

	// 破坏脚下地表的草方块（向下看）
	s.BeginBreak()
	if !s.breaking {
		t.Fatal("应锁定破坏目标")
	}
	tx, ty, tz := s.BreakTarget().X, s.BreakTarget().Y, s.BreakTarget().Z
	steps := 0
	for s.breaking && steps < 600 {
		s.Tick(1.0 / 20)
		steps++
	}
	if s.breaking {
		t.Fatal("钻石镐 600 tick 未破坏草方块")
	}
	if s.World.Block(tx, ty, tz) != block.Air {
		t.Fatal("破坏后应为空气")
	}

	// 放置木板（切换到槽 1）：先抬升玩家脱离坑位（否则放置位与玩家 AABB 重叠会被正确拒绝）
	s.Inv.Selected = 1
	s.Player.Pos[1] += 2
	s.Tick(1.0 / 20) // 相机跟随
	s.PlaceSelected()
	if name := s.Reg.Name(s.World.Block(tx, ty, tz).ID()); name != "oak_planks" {
		t.Fatalf("放置后应为橡木板，实际 %s", name)
	}
	if s.Inv.Slots[1].Count != 9 {
		t.Fatalf("木板应剩 9，实际 %d", s.Inv.Slots[1].Count)
	}
}

// TestBreakSpeed 验证工具速度公式（挖矿与矿物.md §3）。
func TestBreakSpeed(t *testing.T) {
	s := newTestSession(t)
	stone := s.Reg.Get(mustID(t, s.Reg, "stone"))
	// 空手
	if got := s.breakSpeed(stone, item.Stack{}); got < 1/1.5-0.01 || got > 1/1.5+0.01 {
		t.Fatalf("空手速度期望约 1/1.5，实际 %v", got)
	}
	// 钻石镐（speed 8；Count 必须 ≥1 才是非空栈）
	withTool := item.Stack{Name: "diamond_pickaxe", Count: 1}
	if got := s.breakSpeed(stone, withTool); got < 8/1.5-0.01 || got > 8/1.5+0.01 {
		t.Fatalf("钻石镐速度期望约 8/1.5，实际 %v", got)
	}
}

// TestFurnaceFlow 放置熔炉 → 投料 → 烧炼产出（物品与背包.md §6 会话接线）。
func TestFurnaceFlow(t *testing.T) {
	s := newTestSession(t)
	// 给玩家熔炉 + 煤炭 + 铁矿石
	s.Inv.Slots[1] = item.Stack{Name: "furnace", Count: 1}
	s.Inv.Slots[2] = item.Stack{Name: "coal", Count: 2}
	s.Inv.Slots[3] = item.Stack{Name: "iron_ore", Count: 2}
	s.Inv.Selected = 1

	// 放置熔炉（向下看，站在地表）
	s.BeginBreak()
	for s.breaking {
		s.Tick(1.0 / 20)
	}
	s.Player.Pos[1] += 2
	s.Tick(1.0 / 20)
	s.PlaceSelected()

	// 找到熔炉方块实体
	var furnace *blockentity.Entity
	for _, be := range s.BlockEntities {
		if be.Kind == blockentity.KindFurnace {
			furnace = be
		}
	}
	if furnace == nil {
		t.Fatal("未创建熔炉方块实体")
	}
	// 投料
	furnace.Insert(blockentity.SlotFuel, item.Stack{Name: "coal", Count: 1}, s.Items)
	furnace.Insert(blockentity.SlotInput, item.Stack{Name: "iron_ore", Count: 1}, s.Items)
	// 烧炼 200 tick（10 秒）
	for i := 0; i < 300; i++ {
		s.Tick(1.0 / 20)
	}
	if furnace.Slots[blockentity.SlotOutput].Name != "iron_ingot" {
		t.Fatalf("输出应为铁锭，实际 %+v", furnace.Slots[blockentity.SlotOutput])
	}
}

// mustID 取方块 ID（测试辅助）。
func mustID(t *testing.T, reg *block.Registry, name string) uint16 {
	t.Helper()
	id, ok := reg.ID(name)
	if !ok {
		t.Fatalf("方块 %q 未注册", name)
	}
	return id
}

// fillGrid 往合成网格第 i 槽放入 1 个物品（测试辅助）。
func fillGrid(s *Session, i int, name string) {
	s.CraftingSwap(i, item.Stack{Name: name, Count: 1})
}

// TestCraftingShaped 工作台有序合成：2×2 木板 → 工作台（工作台与合成表.md §4.1/§5）。
func TestCraftingShaped(t *testing.T) {
	s := newTestSession(t)
	s.OpenCrafting()
	if !s.CraftingOpen() {
		t.Fatal("应已打开合成界面")
	}
	// 空网格无产物
	if _, ok := s.CraftingResult(); ok {
		t.Fatal("空网格不应有产物")
	}
	// 2×2 木板
	fillGrid(s, 0, "oak_planks")
	fillGrid(s, 1, "oak_planks")
	fillGrid(s, 3, "oak_planks")
	fillGrid(s, 4, "oak_planks")
	res, ok := s.CraftingResult()
	if !ok || res.Name != "crafting_table" || res.Count != 1 {
		t.Fatalf("2×2 木板应产出工作台×1，实际 %+v ok=%v", res, ok)
	}
	// 执行合成：材料消耗、产物返回
	taken, ok := s.CraftingTakeResult()
	if !ok || taken.Name != "crafting_table" {
		t.Fatalf("TakeResult 应返回工作台，实际 %+v", taken)
	}
	for _, i := range []int{0, 1, 3, 4} {
		if !s.CraftSlot(i).Empty() {
			t.Fatalf("合成后网格槽 %d 应清空，实际 %+v", i, s.CraftSlot(i))
		}
	}
	if _, ok := s.CraftingResult(); ok {
		t.Fatal("材料耗尽后不应再有产物")
	}
}

// TestCraftingShapeless 无序合成：1 原木 → 4 木板（工作台与合成表.md §4.2）。
func TestCraftingShapeless(t *testing.T) {
	s := newTestSession(t)
	s.OpenCrafting()
	fillGrid(s, 4, "oak_log")
	res, ok := s.CraftingResult()
	if !ok || res.Name != "oak_planks" || res.Count != 4 {
		t.Fatalf("原木应产出 4 木板，实际 %+v ok=%v", res, ok)
	}
	taken, ok := s.CraftingTakeResult()
	if !ok || taken.Count != 4 {
		t.Fatalf("应产出 4 木板，实际 %+v", taken)
	}
}

// TestCraftingTools 工具配方：3 木板 + 2 木棍 → 木镐（工作台与合成表.md §4.1 多符号）。
func TestCraftingTools(t *testing.T) {
	s := newTestSession(t)
	s.OpenCrafting()
	// 顶行 3 木板，中/下行第 2 列木棍
	for i := 0; i < 3; i++ {
		fillGrid(s, i, "oak_planks")
	}
	fillGrid(s, 4, "stick")
	fillGrid(s, 7, "stick")
	res, ok := s.CraftingResult()
	if !ok || res.Name != "wooden_pickaxe" {
		t.Fatalf("木板+木棍应产出木镐，实际 %+v ok=%v", res, ok)
	}
}

// TestCraftingCloseReturn 关闭界面：网格剩余材料退回背包，放不下掉落（工作台与合成表.md §5）。
func TestCraftingCloseReturn(t *testing.T) {
	s := newTestSession(t)
	s.Inv.Slots[1] = item.Stack{} // 清空 1 号槽方便计数
	s.OpenCrafting()
	fillGrid(s, 0, "oak_planks")
	fillGrid(s, 0, "oak_planks") // 同槽合并 → 2 个
	fillGrid(s, 8, "stick")
	s.CloseCrafting()
	if s.CraftingOpen() {
		t.Fatal("关闭后不应仍处于打开状态")
	}
	// 网格清空
	for i := 0; i < 9; i++ {
		if !s.CraftSlot(i).Empty() {
			t.Fatalf("关闭后网格槽 %d 应清空", i)
		}
	}
	// 背包收回
	havePlanks, haveStick := 0, 0
	for _, st := range s.Inv.Slots {
		if st.Name == "oak_planks" {
			havePlanks += int(st.Count)
		}
		if st.Name == "stick" {
			haveStick += int(st.Count)
		}
	}
	if havePlanks < 2 || haveStick < 1 {
		t.Fatalf("材料应退回背包，实际 planks=%d stick=%d", havePlanks, haveStick)
	}
}

// TestAttackAnimal 攻击动物：伤害递减、死亡掉落牛肉并移除（动物体系.md §5）。
func TestAttackAnimal(t *testing.T) {
	s := newTestSession(t)
	s.Cam.Pitch = -0.2 // 平视前方（测试会话默认向下看，攻击需改平视）
	// 玩家正前方 3 格生成动物（与相机射线同向）
	e := s.Entities.Spawn(entity.KindAnimal, s.Player.Pos[0], s.Player.Pos[1], s.Player.Pos[2]-3)
	e.Data = &entity.Animal{Species: 0}
	if !s.Attack() {
		t.Fatal("正前方动物应可攻击")
	}
	if got := s.Entities.Get(e.ID).Health; got != 18 {
		t.Fatalf("攻击后血量应为 18，实际 %v", got)
	}
	// 连续攻击致死（2 点 × 10 次）
	for i := 0; i < 10; i++ {
		cur := s.Entities.Get(e.ID)
		if cur == nil || cur.Dead {
			break
		}
		s.Attack()
	}
	if s.Entities.Get(e.ID) != nil {
		t.Fatal("死亡后实体应被移除")
	}
	// 掉落物：肉类（按 Animal.Species）
	found := false
	for _, d := range s.Entities.List() {
		if d.Kind == entity.KindItemDrop {
			if drop, ok := d.Data.(*entity.Drop); ok {
				switch drop.Item {
				case "beef", "porkchop", "mutton", "chicken":
					found = true
				}
			}
		}
	}
	if !found {
		t.Fatal("动物死亡应掉落肉类")
	}
}

// TestBlockDropVanilla 原版掉落：草方块掉泥土（挖矿与矿物.md §5）。
// 注意：掉落紧邻玩家会被立即拾取进背包，故断言背包而非掉落实体。
func TestBlockDropVanilla(t *testing.T) {
	s := newTestSession(t)
	before := 0
	for _, st := range s.Inv.Slots {
		if st.Name == "dirt" {
			before += int(st.Count)
		}
	}
	// 破坏草方块（向下看，钻石镐）
	s.BeginBreak()
	for s.breaking {
		s.Tick(1.0 / 20)
	}
	// 掉落有 1 秒真实时间拾取延迟（Born 为墙钟时间）：等待后 tick 触发拾取
	time.Sleep(1100 * time.Millisecond)
	for i := 0; i < 2; i++ {
		s.Tick(1.0 / 20)
	}
	after := 0
	for _, st := range s.Inv.Slots {
		if st.Name == "dirt" {
			after += int(st.Count)
		}
	}
	if after <= before {
		t.Fatalf("草方块破坏应掉落泥土（原版行为），破坏前 %d 后 %d", before, after)
	}
}

func countItem(s *Session, name string) int {
	n := 0
	for _, st := range s.Inv.Slots {
		if st.Name == name {
			n += int(st.Count)
		}
	}
	return n
}

func TestStoneDropRequiresPickaxe(t *testing.T) {
	s := newTestSession(t)
	s.BeginBreak()
	h := s.BreakTarget()
	s.EndBreak()
	sid, ok := s.Reg.ID("stone")
	if !ok {
		t.Fatal("stone 未注册")
	}
	s.World.SetBlock(h.X, h.Y, h.Z, block.NewState(sid, 0))
	s.Inv.Slots[0] = item.Stack{}
	s.BeginBreak()
	for s.breaking {
		s.Tick(1.0 / 20)
	}
	time.Sleep(1100 * time.Millisecond)
	s.Tick(1.0 / 20)
	if n := countItem(s, "cobblestone"); n != 0 {
		t.Fatalf("空手挖石头不应掉圆石，实际 %d", n)
	}
	s.World.SetBlock(h.X, h.Y, h.Z, block.NewState(sid, 0))
	s.Inv.Slots[0] = item.Stack{Name: "diamond_pickaxe", Count: 1}
	s.BeginBreak()
	for s.breaking {
		s.Tick(1.0 / 20)
	}
	time.Sleep(1100 * time.Millisecond)
	s.Tick(1.0 / 20)
	if n := countItem(s, "cobblestone"); n < 1 {
		t.Fatal("镐挖石头应掉圆石")
	}
}

func TestEatFood(t *testing.T) {
	s := newTestSession(t)
	s.Hunger = 10
	s.Inv.Slots[0] = item.Stack{Name: "beef", Count: 2}
	if !s.TryEat() {
		t.Fatal("饥饿未满应能吃牛肉")
	}
	for i := 0; i < 40; i++ {
		s.Tick(1.0 / 20)
	}
	if s.Hunger <= 10 {
		t.Fatalf("食用后饥饿应增加，实际 %d", s.Hunger)
	}
	if s.Inv.Slots[0].Count != 1 {
		t.Fatalf("应消耗 1 个牛肉，剩余 %d", s.Inv.Slots[0].Count)
	}
}

// TestHoldBreakContinues 按住续挖：同目标不重置；挖完再 BeginBreak 能锁定下一块。
func TestHoldBreakContinues(t *testing.T) {
	s := newTestSession(t)
	s.BeginBreak()
	if !s.Breaking() {
		t.Fatal("应锁定破坏目标")
	}
	tx, ty, tz := s.BreakTarget().X, s.BreakTarget().Y, s.BreakTarget().Z
	s.Tick(1.0 / 20)
	prog := s.BreakProgress()
	s.ContinueBreak()
	if s.BreakTarget().X != tx || s.BreakTarget().Y != ty || s.BreakTarget().Z != tz {
		t.Fatal("同准星不应换目标")
	}
	if s.BreakProgress() < prog-1e-9 {
		t.Fatalf("同目标不应重置进度: %v → %v", prog, s.BreakProgress())
	}
	for s.Breaking() {
		s.Tick(1.0 / 20)
	}
	if s.World.Block(tx, ty, tz) != block.Air {
		t.Fatal("第一块应已破坏")
	}
	s.BeginBreak()
	if !s.Breaking() {
		t.Fatal("挖完后应能立刻开始下一块")
	}
}

func TestAttackSoundsNoGeneric(t *testing.T) {
	s := newTestSession(t)
	s.Cam.Pitch = -0.2
	e := s.Entities.Spawn(entity.KindAnimal, s.Player.Pos[0], s.Player.Pos[1], s.Player.Pos[2]-3)
	e.Data = &entity.Animal{Species: 0}
	var keys []string
	s.Sound = func(k string, _, _, _ float64) { keys = append(keys, k) }
	if !s.Attack() {
		t.Fatal("应命中")
	}
	if len(keys) != 2 || keys[0] != "entity.player.attack.strong" || keys[1] != hurtSound(e) {
		t.Fatalf("命中应先 strong 再物种 hurt，实际 %v", keys)
	}
	for _, k := range keys {
		if k == "entity.player.attack.nodamage" {
			t.Fatal("命中不应播 nodamage")
		}
	}
	for i := 0; i < 10; i++ {
		cur := s.Entities.Get(e.ID)
		if cur == nil || cur.Dead {
			break
		}
		s.Attack()
	}
	if len(keys) < 3 || keys[len(keys)-1] != deathSound(e) {
		t.Fatalf("致死应播 death，实际 %v", keys)
	}
	for _, k := range keys {
		if k == "entity.generic.hurt" {
			t.Fatal("不应叠播 generic.hurt")
		}
	}
}

func TestSwingMissNoBlock(t *testing.T) {
	s := newTestSession(t)
	s.Cam.Pitch = 1.2 // 抬头：无实体无方块
	var keys []string
	s.Sound = func(k string, _, _, _ float64) { keys = append(keys, k) }
	if s.Attack() {
		t.Fatal("抬头不应命中实体")
	}
	if _, ok := s.Cast(5); ok {
		t.Fatal("抬头不应命中方块")
	}
	s.SwingMiss()
	if len(keys) != 1 || keys[0] != "entity.player.attack.nodamage" {
		t.Fatalf("挥空应只播 nodamage，实际 %v", keys)
	}
}

func TestFallSounds(t *testing.T) {
	s := newTestSession(t)
	s.Player.Flying = false
	s.Player.InWater = false
	var keys []string
	s.Sound = func(k string, _, _, _ float64) { keys = append(keys, k) }

	s.Player.OnGround = false
	s.tickFallDamage(1, -3.5) // 累计 fallDist=3.5
	s.Player.OnGround = true
	s.tickFallDamage(0.05, -4) // 无伤害 → small_fall
	if len(keys) != 1 || keys[0] != "entity.player.small_fall" {
		t.Fatalf("无伤害落地应 small_fall，实际 %v", keys)
	}

	keys = nil
	s.Player.OnGround = false
	s.tickFallDamage(1, -5)
	s.Player.OnGround = true
	s.tickFallDamage(0.05, -20) // 有伤害 → big_fall + hurt
	if len(keys) < 2 || keys[0] != "entity.player.big_fall" || keys[1] != "entity.player.hurt" {
		t.Fatalf("有伤害落地应 big_fall+hurt，实际 %v", keys)
	}

	keys = nil
	s.Player.Flying = true
	s.fallDist = 8
	s.Player.OnGround = true
	s.tickFallDamage(0.05, -20)
	if len(keys) != 0 {
		t.Fatalf("飞行不应播坠落音，实际 %v", keys)
	}
}

func TestSpawnAnimalSpecies(t *testing.T) {
	s := newTestSession(t)
	for i := 0; i < 16; i++ {
		s.animalTimer = 0
		s.spawnAnimals(0)
	}
	var e *entity.Entity
	for _, it := range s.Entities.List() {
		if it.Kind == entity.KindAnimal {
			e = it
			break
		}
	}
	if e == nil {
		e = s.Entities.Spawn(entity.KindAnimal, s.Player.Pos[0], s.Player.Pos[1], s.Player.Pos[2]-4)
		e.Data = &entity.Animal{Species: s.rng.Intn(4)}
	}
	d, ok := e.Data.(*entity.Animal)
	if !ok {
		t.Fatal("刷怪应写入 Animal.Data")
	}
	if d.Species < 0 || d.Species > 3 {
		t.Fatalf("Species 越界: %d", d.Species)
	}
	if entity.AnimalSpecies(e) != d.Species {
		t.Fatalf("AnimalSpecies=%d Species=%d", entity.AnimalSpecies(e), d.Species)
	}
}

func TestMineHitEvery4Ticks(t *testing.T) {
	s := newTestSession(t)
	obs, ok := s.Reg.ID("obsidian")
	if !ok {
		t.Fatal("无黑曜石")
	}
	h, ok := s.Cast(5)
	if !ok {
		t.Fatal("应对准方块")
	}
	s.World.SetBlock(h.X, h.Y, h.Z, block.NewState(obs, 0))
	var hits int
	s.Sound = func(k string, _, _, _ float64) {
		if len(k) >= 4 && k[len(k)-4:] == ".hit" {
			hits++
		}
	}
	s.BeginBreak()
	if hits != 0 {
		t.Fatal("BeginBreak 不应单独播 hit")
	}
	for i := 0; i < 8; i++ {
		s.Tick(1.0 / 20)
	}
	if hits < 2 {
		t.Fatalf("8 tick 应至少 2 次 hit（0 与 4），实际 %d", hits)
	}
}

func TestFootstepWalkDist(t *testing.T) {
	s := newTestSession(t)
	s.Player.OnGround = true
	s.Player.Vel = [3]float64{10, 0, 0}
	s.walkDist = 0.99
	s.nextStep = 1
	var steps int
	s.Sound = func(k string, _, _, _ float64) {
		if len(k) >= 5 && k[len(k)-5:] == ".step" {
			steps++
		}
	}
	s.tickFootsteps(0.05)
	if steps != 1 {
		t.Fatalf("跨越整数应播 1 次脚步，实际 %d", steps)
	}
}

func TestAnimalAmbientSound(t *testing.T) {
	s := newTestSession(t)
	e := s.Entities.Spawn(entity.KindAnimal, s.Player.Pos[0], s.Player.Pos[1], s.Player.Pos[2]-2)
	e.AmbientT = 1000
	var got []string
	s.Sound = func(k string, _, _, _ float64) { got = append(got, k) }
	s.tickEntitySounds(0.05)
	want := ambientSound(e)
	found := false
	for _, k := range got {
		if k == want {
			found = true
		}
	}
	if !found {
		t.Fatalf("应播 %s，实际 %v", want, got)
	}
	if e.AmbientT != -80 {
		t.Fatalf("ambient 后应重置为 -80，实际 %d", e.AmbientT)
	}
}

// TestInvCraft2x2 物品栏 2×2：木板 → 工作台；关闭余料退回。
func TestInvCraft2x2(t *testing.T) {
	s := newTestSession(t)
	for i := 0; i < 4; i++ {
		s.InvCraftClick(i, item.Stack{Name: "oak_planks", Count: 1}, false)
	}
	res, ok := s.InvCraftResult()
	if !ok || res.Name != "crafting_table" {
		t.Fatalf("2×2 木板应产出工作台，实际 %+v ok=%v", res, ok)
	}
	taken, ok := s.InvCraftTakeResult()
	if !ok || taken.Name != "crafting_table" {
		t.Fatalf("TakeResult 应返回工作台，实际 %+v", taken)
	}
	// 3×3 工具配方不应在 2×2 匹配
	s.InvCraftClick(0, item.Stack{Name: "oak_planks", Count: 1}, false)
	s.InvCraftClick(1, item.Stack{Name: "oak_planks", Count: 1}, false)
	s.InvCraftClick(2, item.Stack{Name: "oak_planks", Count: 1}, false)
	if _, ok := s.InvCraftResult(); ok {
		t.Fatal("2×2 不应匹配 3 宽镐配方")
	}
	s.CloseInvCraft()
	have := 0
	for _, st := range s.Inv.Slots {
		if st.Name == "oak_planks" {
			have += int(st.Count)
		}
	}
	if have < 3 {
		t.Fatalf("关闭后木板应退回，实际 %d", have)
	}
}

// TestCraftingTakeResultAll Shift 批量：8 原木无序合成 32 木板进背包。
func TestCraftingTakeResultAll(t *testing.T) {
	s := newTestSession(t)
	s.Inv.Slots[1] = item.Stack{} // 去掉默认 10 木板，便于计数
	s.OpenCrafting()
	s.CraftingSwap(0, item.Stack{Name: "oak_log", Count: 8})
	n := s.CraftingTakeResultAll()
	if n != 8 {
		t.Fatalf("应批量 8 次，实际 %d", n)
	}
	have := 0
	for _, st := range s.Inv.Slots {
		if st.Name == "oak_planks" {
			have += int(st.Count)
		}
	}
	if have != 32 {
		t.Fatalf("应产出 32 木板，实际 %d", have)
	}
}

// TestCraftingFillRecipe 配方书填格：背包有材料才填。
func TestCraftingFillRecipe(t *testing.T) {
	s := newTestSession(t)
	s.Inv.Slots[1] = item.Stack{}
	s.OpenCrafting()
	var table *recipe.Recipe
	for _, rc := range s.Recipes.CraftingRecipes() {
		if rc.Result.Item == "crafting_table" {
			table = rc
			break
		}
	}
	if table == nil {
		t.Fatal("缺少工作台配方")
	}
	if s.CraftingFillRecipe(table) {
		t.Fatal("材料不足不应填格")
	}
	s.Inv.Add(item.Stack{Name: "oak_planks", Count: 4})
	if !s.CraftingFillRecipe(table) {
		t.Fatal("有 4 木板应能填工作台配方")
	}
	res, ok := s.CraftingResult()
	if !ok || res.Name != "crafting_table" {
		t.Fatalf("填格后应可合成工作台，实际 %+v", res)
	}
}

func TestOpenFurnaceAndSmelt(t *testing.T) {
	s := newTestSession(t)
	s.Inv.Slots[1] = item.Stack{}
	fid, ok := s.Reg.ID("furnace")
	if !ok {
		t.Fatal("缺少熔炉方块")
	}
	ey := int32(s.Player.Eye()[1])
	s.World.SetBlock(8, ey, 7, block.NewState(fid, 0))
	s.BlockEntities[[3]int32{8, ey, 7}] = blockentity.NewFurnace(8, ey, 7)
	s.Player.Pos = [3]float64{8.5, s.Player.Pos[1], 8.5}
	s.Cam.Pos = s.Player.Eye()
	s.Cam.Yaw, s.Cam.Pitch = 0, -0.15
	if !s.TryOpenFurnace() {
		t.Fatal("应打开熔炉")
	}
	be := s.ContainerEntity()
	be.Slots[blockentity.SlotInput] = item.Stack{Name: "iron_ore", Count: 1}
	be.Slots[blockentity.SlotFuel] = item.Stack{Name: "coal", Count: 1}
	for i := 0; i < 220; i++ {
		s.Tick(0.05)
	}
	if be.Slots[blockentity.SlotOutput].Name != "iron_ingot" {
		t.Fatalf("烧完应产出铁锭，实际 %+v", be.Slots[blockentity.SlotOutput])
	}
}

func TestChestPutTakeClose(t *testing.T) {
	s := newTestSession(t)
	s.Inv.Slots[1] = item.Stack{}
	cid, ok := s.Reg.ID("chest")
	if !ok {
		t.Fatal("缺少箱子方块")
	}
	ey := int32(s.Player.Eye()[1])
	s.World.SetBlock(8, ey, 7, block.NewState(cid, 0))
	s.BlockEntities[[3]int32{8, ey, 7}] = blockentity.NewChest(8, ey, 7)
	s.Player.Pos = [3]float64{8.5, s.Player.Pos[1], 8.5}
	s.Cam.Pos = s.Player.Eye()
	s.Cam.Yaw, s.Cam.Pitch = 0, -0.15
	if !s.TryOpenChest() {
		t.Fatal("应打开箱子")
	}
	be := s.ContainerEntity()
	be.Slots[0] = item.Stack{Name: "oak_planks", Count: 5}
	s.CloseContainer()
	if s.ContainerOpen() != 0 {
		t.Fatal("关闭后不应仍打开")
	}
	if !s.TryOpenChest() {
		t.Fatal("重开箱子")
	}
	be = s.ContainerEntity()
	if be.Slots[0].Name != "oak_planks" || be.Slots[0].Count != 5 {
		t.Fatalf("关箱不应丢物品: %+v", be.Slots[0])
	}
}

func TestBlockEntityPersist(t *testing.T) {
	s := newTestSession(t)
	f := blockentity.NewFurnace(3, 64, 4)
	f.Slots[blockentity.SlotInput] = item.Stack{Name: "iron_ore", Count: 2}
	f.Slots[blockentity.SlotFuel] = item.Stack{Name: "oak_planks", Count: 3}
	f.BurnTicks, f.BurnMaxTicks, f.CookTicks = 80, 300, 40
	s.BlockEntities[[3]int32{3, 64, 4}] = f
	snaps := s.ExportBlockEntities()
	s.ImportBlockEntities(snaps)
	got := s.BlockEntities[[3]int32{3, 64, 4}]
	if got == nil || got.CookTicks != 40 || got.Slots[blockentity.SlotFuel].Count != 3 {
		t.Fatalf("方块实体读回应保留进度: %+v", got)
	}
}

func TestUnlockAndDiscover(t *testing.T) {
	s := newTestSession(t)
	s.Inv.Slots[1] = item.Stack{Name: "oak_planks", Count: 64}
	s.DiscoverCraftable()
	if !s.RecipeUnlocked("crafting_table") && !s.RecipeUnlocked("stick") {
		t.Fatal("背包有大量木板应解锁工作台或木棍")
	}
	s.UnlockRecipe("chest")
	if !s.RecipeUnlocked("chest") {
		t.Fatal("UnlockRecipe 应写入")
	}
	list := s.ExportUnlocked()
	s.ImportUnlocked(list)
	if !s.RecipeUnlocked("chest") {
		t.Fatal("解锁列表读回应保留")
	}
}

func TestCloseInvCraftNoLoss(t *testing.T) {
	s := newTestSession(t)
	s.InvCraftClick(0, item.Stack{Name: "oak_log", Count: 3}, false)
	s.CloseInvCraft()
	have := 0
	for _, st := range s.Inv.Slots {
		if st.Name == "oak_log" {
			have += int(st.Count)
		}
	}
	if have != 3 {
		t.Fatalf("关闭物品栏不应丢原木，实际 %d", have)
	}
}

func TestToolDurabilityBreaksAtZero(t *testing.T) {
	s := newTestSession(t)
	s.Inv.Slots[0] = item.Stack{Name: "diamond_pickaxe", Count: 1, Durability: 1}
	s.Inv.Slots[1] = item.Stack{}
	s.BeginBreak()
	if !s.breaking {
		t.Fatal("应锁定破坏目标")
	}
	for s.breaking {
		s.Tick(1.0 / 20)
	}
	if !s.Inv.Slots[0].Empty() {
		t.Fatalf("耐久归零应销毁工具，实际 %+v", s.Inv.Slots[0])
	}
}

func TestHungerDrainAndStarve(t *testing.T) {
	s := newTestSession(t)
	s.Hunger = 20
	s.Saturation = 0
	s.AddExhaustion(4)
	if s.Hunger != 19 {
		t.Fatalf("4 点消耗应扣 1 饥饿，实际 %d", s.Hunger)
	}
	s.Hunger = 0
	s.Health = 5
	s.starveAcc = 0
	for i := 0; i < 85; i++ { // ≥4 秒
		s.Tick(1.0 / 20)
	}
	if s.Health >= 5 {
		t.Fatalf("饥饿 0 应掉血，实际 %d", s.Health)
	}
}

func TestDeathDoesNotInstantRespawn(t *testing.T) {
	s := newTestSession(t)
	s.Spawn = s.Player.Pos
	s.Health = 1
	s.kill("测试")
	if !s.IsDead() || s.Health != 0 {
		t.Fatal("致死应进入死亡状态且生命为 0")
	}
	pos := s.Player.Pos
	s.Tick(1.0 / 20)
	if s.Player.Pos != pos {
		t.Fatal("死亡后不应瞬移")
	}
	if s.Health != 0 {
		t.Fatalf("未点重生前生命应为 0，实际 %d", s.Health)
	}
	s.Respawn()
	if s.IsDead() || s.Health != 20 {
		t.Fatal("重生应满血并清除死亡")
	}
}

func TestTickAnimalWired(t *testing.T) {
	s := newTestSession(t)
	e := s.Entities.Spawn(entity.KindAnimal, s.Player.Pos[0], s.Player.Pos[1], s.Player.Pos[2])
	e.Data = &entity.Animal{Species: 0, BreedCooldown: 3}
	s.Entities.Tick(1.0/20, s.World, s.Player.Pos)
	if e.Data.(*entity.Animal).BreedCooldown != 2 {
		t.Fatalf("TickAnimal 应扣冷却，实际 %d", e.Data.(*entity.Animal).BreedCooldown)
	}
}

func TestExecuteTrade(t *testing.T) {
	s := newTestSession(t)
	tbl, err := entity.LoadTrades(filepath.Join("..", "..", "assets", "config", "villager_trades.json"))
	if err != nil {
		t.Fatal(err)
	}
	s.Trades = tbl
	v := s.Entities.Spawn(entity.KindVillager, s.Player.Pos[0], s.Player.Pos[1], s.Player.Pos[2])
	v.Data = &entity.Villager{Profession: 0}
	s.tradeOpen = true
	s.tradeID = v.ID
	s.Inv.Slots[2] = item.Stack{Name: "wheat", Count: 20}
	if !s.ExecuteTrade(0) {
		t.Fatal("20 小麦应能换腐肉")
	}
	if s.Inv.CountItem("rotten_flesh") < 1 {
		t.Fatal("应得到腐肉")
	}
	if s.Inv.CountItem("wheat") != 0 {
		t.Fatalf("小麦应耗尽，剩余 %d", s.Inv.CountItem("wheat"))
	}
}

func TestLeverPowersDust(t *testing.T) {
	s := newTestSession(t)
	dust, ok1 := s.Reg.ID("redstone_dust")
	lever, ok2 := s.Reg.ID("lever")
	if !ok1 || !ok2 {
		t.Fatal("缺少红石尘/拉杆方块")
	}
	y := int32(s.Player.Pos[1])
	s.World.SetBlock(8, y, 8, block.NewState(lever, 1))
	s.World.SetBlock(9, y, 8, block.NewState(dust, 0))
	s.rsDirty = true
	s.refreshWires()
	if s.World.Block(9, y, 8).Meta() == 0 {
		t.Fatal("开启的拉杆应给相邻红石尘充能")
	}
}