//go:build gl

// 物品栏界面（UI还原.md §3.3、物品与背包.md §3）：
// inventory.png 176×166 + 27 主区 (7,83) + 热键栏 (7,141) + 盔甲 4 (7,8)
// + 副手 (77,8) + 2×2 (98,8) + 输出 (125,24) + 玩家模型 (34,9)–(69,80)。
package ui

import (
	"fmt"

	"mc/internal/item"
)

// InventoryScreen 物品栏界面。
type InventoryScreen struct {
	itemIcons
	bgTex      uint32
	winW, winH float32

	tipTex     uint32
	tipW, tipH float32
	OpenT      float32
}

// NewInventoryScreen 创建物品栏界面。
func NewInventoryScreen(bgTex uint32, items *item.Registry) *InventoryScreen {
	s := &InventoryScreen{bgTex: bgTex, winW: 176, winH: 166, OpenT: 1}
	s.items = items
	s.itemUV = map[string][4]float32{}
	s.blockUV = map[string][4]float32{}
	return s
}

// SetItemAtlas 设置 items 图集。
func (s *InventoryScreen) SetItemAtlas(tex uint32, uv map[string][4]float32) {
	s.setItemAtlas(tex, uv)
}

// SetBlockAtlas 设置 blocks 图集。
func (s *InventoryScreen) SetBlockAtlas(tex uint32, uv map[string][4]float32) {
	s.setBlockAtlas(tex, uv)
}

// SetTooltip 设置悬停名称纹理（tick 光栅化 CJK，渲染线程上传）。
func (s *InventoryScreen) SetTooltip(tex uint32, w, h float32) {
	s.tipTex = tex
	s.tipW, s.tipH = w, h
}

// HitTest 命中：main0–26 / hot0–8 / armor0–3 / offhand / craft0–3 / result。
func (s *InventoryScreen) HitTest(mx, my float32, screenW, screenH, scale float32) string {
	bx, by := screenW/2-s.winW/2*scale, screenH/2-s.winH/2*scale
	for i := 0; i < 4; i++ {
		if hitSlot(mx, my, bx, by, 7, 8+float32(i)*18, scale) {
			return "armor" + fmt.Sprintf("%d", i)
		}
	}
	if hitSlot(mx, my, bx, by, 77, 8, scale) {
		return "offhand"
	}
	for i := 0; i < 4; i++ {
		px := 98 + float32(i%2)*18
		py := 8 + float32(i/2)*18
		if hitSlot(mx, my, bx, by, px, py, scale) {
			return "craft" + fmt.Sprintf("%d", i)
		}
	}
	if hitSlot(mx, my, bx, by, 125, 24, scale) {
		return "result"
	}
	for i := 0; i < 27; i++ {
		px := 7 + float32(i%9)*18
		py := 83 + float32(i/9)*18
		if hitSlot(mx, my, bx, by, px, py, scale) {
			return "main" + fmt.Sprintf("%d", i)
		}
	}
	for i := 0; i < 9; i++ {
		if hitSlot(mx, my, bx, by, 7+float32(i)*18, 141, scale) {
			return "hot" + fmt.Sprintf("%d", i)
		}
	}
	return ""
}

// Draw 绘制物品栏（slots 含盔甲/副手；craft 为 2×2；res 为输出）。
func (s *InventoryScreen) Draw(r *Renderer, slots []item.Stack, craft [4]item.Stack, res item.Stack, hasRes bool, held item.Stack, mx, my, scale float32) {
	w, h := float32(r.w), float32(r.h)
	r.DrawRect(0, 0, w, h, [4]float32{0, 0, 0, 0.35})
	sc := scale * (0.85 + 0.15*s.OpenT)
	bx, by := w/2-s.winW/2*sc, h/2-s.winH/2*sc
	if s.bgTex != 0 {
		r.pushQuad(quad{x: bx, y: by, w: s.winW * sc, h: s.winH * sc,
			u0: 0, v0: 0, u1: 176.0 / 256.0, v1: 166.0 / 256.0,
			r: 1, g: 1, b: 1, a: 1, tex: s.bgTex})
	}
	s.drawPlayerModel(r, bx, by, sc)
	// 盔甲 4
	for i := 0; i < 4; i++ {
		idx := 36 + i
		st := item.Stack{}
		if idx < len(slots) {
			st = slots[idx]
		}
		s.drawSlot(r, st, bx+(7+1)*sc, by+(8+float32(i)*18+1)*sc, sc)
	}
	if 40 < len(slots) {
		s.drawSlot(r, slots[40], bx+(77+1)*sc, by+(8+1)*sc, sc)
	}
	for i := 0; i < 4; i++ {
		px := 98 + float32(i%2)*18
		py := 8 + float32(i/2)*18
		s.drawSlot(r, craft[i], bx+(px+1)*sc, by+(py+1)*sc, sc)
	}
	if hasRes {
		s.drawSlot(r, res, bx+(125+1)*sc, by+(24+1)*sc, sc)
	}
	for i := 0; i < 27; i++ {
		idx := 9 + i
		st := item.Stack{}
		if idx < len(slots) {
			st = slots[idx]
		}
		px := 7 + float32(i%9)*18
		py := 83 + float32(i/9)*18
		s.drawSlot(r, st, bx+(px+1)*sc, by+(py+1)*sc, sc)
	}
	for i := 0; i < 9 && i < len(slots); i++ {
		s.drawSlot(r, slots[i], bx+(7+float32(i)*18+1)*sc, by+(141+1)*sc, sc)
	}
	if !held.Empty() {
		s.drawSlot(r, held, mx-8*scale, my-8*scale, scale)
	}
	if s.tipTex != 0 && s.tipW > 0 {
		tx, ty := mx+12, my+12
		drawTooltipBG(r, tx, ty, s.tipW, s.tipH)
		r.pushQuad(quad{x: tx, y: ty, w: s.tipW, h: s.tipH,
			u0: 0, v0: 0, u1: 1, v1: 1, r: 1, g: 1, b: 1, a: 1, tex: s.tipTex})
	}
}

func (s *InventoryScreen) drawPlayerModel(r *Renderer, bx, by, scale float32) {
	// 简化纸片人，区域 (34,9)–(69,80)
	ox, oy := bx+34*scale, by+9*scale
	skin := [4]float32{0.85, 0.68, 0.52, 1}
	shirt := [4]float32{0.25, 0.35, 0.75, 1}
	pants := [4]float32{0.22, 0.22, 0.55, 1}
	// 头 8×8、身 8×12、臂 4×12、腿 4×12（逻辑像素）
	r.DrawRect(ox+10*scale, oy+2*scale, 8*scale, 8*scale, skin)
	r.DrawRect(ox+10*scale, oy+10*scale, 8*scale, 12*scale, shirt)
	r.DrawRect(ox+6*scale, oy+10*scale, 4*scale, 12*scale, shirt)
	r.DrawRect(ox+18*scale, oy+10*scale, 4*scale, 12*scale, shirt)
	r.DrawRect(ox+10*scale, oy+22*scale, 4*scale, 12*scale, pants)
	r.DrawRect(ox+14*scale, oy+22*scale, 4*scale, 12*scale, pants)
}