//go:build gl

// 实体可视映射：实体类型 → 贴图键/身高/动物模型（渲染.md §5.3）。
package main

import (
	"mc/internal/entity"
	"mc/internal/item"
	"mc/internal/render"
)

// entitySkinKeys 实体皮肤候选（temperate 优先，回退短名）。
var entitySkinKeys = []string{
	"entity/player/wide/steve",
	"entity/steve",
	"entity/zombie/zombie",
	"entity/villager/villager",
	"entity/cow/cow_temperate",
	"entity/cow/cow",
	"entity/pig/pig_temperate",
	"entity/pig/pig",
	"entity/sheep/sheep_temperate",
	"entity/sheep/sheep",
	"entity/sheep/sheep_fur",
	"entity/sheep/sheep_wool",
	"entity/chicken/chicken_temperate",
	"entity/chicken/chicken",
}

// requiredEntitySkinGroups 必选皮肤候选组：组内任一键命中即可；全缺才品红占位。
var requiredEntitySkinGroups = [][]string{
	{"entity/zombie/zombie"},
	{"entity/villager/villager"},
	{"entity/cow/cow_temperate", "entity/cow/cow"},
	{"entity/pig/pig_temperate", "entity/pig/pig"},
	{"entity/sheep/sheep_temperate", "entity/sheep/sheep"},
	{"entity/chicken/chicken_temperate", "entity/chicken/chicken"},
}

func firstUV(r *render.Renderer, keys ...string) ([4]float32, bool) {
	for _, k := range keys {
		if uv, ok := r.EntityUV(k); ok {
			return uv, true
		}
	}
	return [4]float32{}, false
}

// entityVisual 返回实体的贴图键与身高（米）。
// 动物额外返回外观变体（0 牛 / 1 猪 / 2 羊 / 3 鸡）。
func entityVisual(e *entity.Entity, items *item.Registry) (key string, height float32, variant int) {
	switch e.Kind {
	case entity.KindZombie:
		return "entity/zombie/zombie", 1.95, -1
	case entity.KindVillager:
		return "entity/villager/villager", 1.95, -1
	case entity.KindAnimal:
		switch entity.AnimalSpecies(e) {
		case 0:
			return "entity/cow/cow_temperate", 1.4, 0
		case 1:
			return "entity/pig/pig_temperate", 0.9, 1
		case 2:
			return "entity/sheep/sheep", 1.3, 2
		default:
			return "entity/chicken/chicken_temperate", 0.7, 3
		}
	case entity.KindItemDrop:
		d, ok := e.Data.(*entity.Drop)
		if !ok || items == nil {
			return "", 0, -1
		}
		def, ok := items.Get(d.Item)
		if !ok {
			return "", 0, -1
		}
		return def.Texture, 0.45, -1
	default:
		return "", 0, -1
	}
}

func animalSkinKeys(variant int) []string {
	switch variant {
	case 0:
		return []string{"entity/cow/cow_temperate", "entity/cow/cow"}
	case 1:
		return []string{"entity/pig/pig_temperate", "entity/pig/pig"}
	case 2:
		return []string{"entity/sheep/sheep_temperate", "entity/sheep/sheep"}
	default:
		return []string{"entity/chicken/chicken_temperate", "entity/chicken/chicken"}
	}
}