package world

import (
	"github.com/Tnze/go-mc/bot/world/entity"
)

//World record all of the things in the world where player at
type World struct {
	Entities map[int32]entity.Entity
	Chunks   map[ChunkLoc]*Chunk
}

//Chunk store a 256*16*16 column blocks
type Chunk struct {
	sections [16]Section
}

//Section store a 16*16*16 cube blocks
type Section interface {
	GetBlock(x, y, z int) (blockID uint32)
}

type ChunkLoc struct {
	X, Z int
}

// //Entity 表示一个实体
// type Entity interface {
// 	EntityID() int32
// }

// //Face is a face of a block
// type Face byte

// // All six faces in a block
// const (
// 	Bottom Face = iota
// 	Top
// 	North
// 	South
// 	West
// 	East
// )

// // getBlock return the block in the position (x, y, z)
// func (w *world) getBlock(x, y, z int) Block {
// 	c := w.chunks[chunkLoc{x >> 4, z >> 4}]
// 	if c != nil {
// 		cx, cy, cz := x&15, y&15, z&15
// 		/*
// 			n = n&(16-1)

// 			is equal to

// 			n %= 16
// 			if n < 0 { n += 16 }
// 		*/

// 		return c.sections[y/16].blocks[cx][cy][cz]
// 	}

// 	return Block{id: 0}
// }

// func (b Block) String() string {
// 	return blockNameByID[b.id]
// }

//LoadChunk load chunk at (x, z)
func (w *World) LoadChunk(x, z int, c *Chunk) {
	w.Chunks[ChunkLoc{X: x, Z: z}] = c
}