package mapgens

import (
	"lab.zaar.be/thefish/alchemyst-go/engine/gamemap"
	"lab.zaar.be/thefish/alchemyst-go/engine/types"
	"lab.zaar.be/thefish/alchemyst-go/util"
)

//fixme move to config
var minRoomSize = 3
var maxRoomSize = 22
var maxrooms = 50

var fges = map[int]types.RectFill{
	1: types.RectFill{
		Top:         func() *gamemap.Tile { return gamemap.NewWall() },
		Bottom:      func() *gamemap.Tile { return gamemap.NewWall() },
		Left:        func() *gamemap.Tile { return gamemap.NewWall() },
		Right:       func() *gamemap.Tile { return gamemap.NewWall() },
		BottomLeft:  func() *gamemap.Tile { return gamemap.NewWall() },
		BottomRight: func() *gamemap.Tile { return gamemap.NewWall() },
		TopLeft:     func() *gamemap.Tile { return gamemap.NewWall() },
		TopRight:    func() *gamemap.Tile { return gamemap.NewWall() },
		Body:        func() *gamemap.Tile { return gamemap.NewFloor() },
	},

	2: types.RectFill{
		Top:         func() *gamemap.Tile { return gamemap.NewWaterTile() },
		Bottom:      func() *gamemap.Tile { return gamemap.NewWaterTile() },
		Left:        func() *gamemap.Tile { return gamemap.NewWaterTile() },
		Right:       func() *gamemap.Tile { return gamemap.NewWaterTile() },
		BottomLeft:  func() *gamemap.Tile { return gamemap.NewWaterTile() },
		BottomRight: func() *gamemap.Tile { return gamemap.NewWaterTile() },
		TopLeft:     func() *gamemap.Tile { return gamemap.NewWaterTile() },
		TopRight:    func() *gamemap.Tile { return gamemap.NewWaterTile() },
		Body:        func() *gamemap.Tile { return gamemap.NewDeepWaterTile() },
	},
}

func DefaultGen(l *gamemap.Level) (*gamemap.Level, []*gamemap.Room) {

	rng := util.NewRNG()

	//fill with walls
	for i := 0; i < l.W; i ++ {
		for j := 0; j < l.H; j++ {
			l.SetTileByXY(i, j, gamemap.NewWall())
		}
	}

	rooms := make([]*gamemap.Room, 0)

	for i := 0; i < maxrooms; i++ {
		var failed = false
		var fillage types.RectFill
		fillage = fges[rng.GetWeightedEntity(map[int]int{1: 10, 2: 1})]
		newRoom := gamemap.NewRandomRectRoom(
			rng,
			rng.Range(minRoomSize, maxRoomSize),
			rng.Range(minRoomSize, maxRoomSize),
			fillage,
		)
		where := types.Coords{
			rng.Range(1, l.W -2 - newRoom.W),
			rng.Range(1, l.H - 2 - newRoom.H),
		}


		for _, otherRoom := range rooms {
			if otherRoom.Intersects(newRoom.Rect) {
				failed = true
				break
			}
		}

		if !failed {
			rooms = append(rooms, newRoom)
		}

		newRoom.BlitToLevel(l, where)
		//addStairs(rooms)
		//itemize(rooms)
	}

	for idx, room := range rooms {
		if idx > 0 {
			connectRooms(l, room, rooms[idx-1], fillage, rng.Range(0, 1))
		}
	}

	return l, rooms
}

func connectRooms(l *gamemap.Level, room, otherRoom *gamemap.Room, fillage types.RectFill, toss int) {
	if toss == 0 {
		digHTunnel(l, room.Center.X, otherRoom.Center.X, room.Center.Y, fillage)
		digVTunnel(l, room.Center.Y, otherRoom.Center.Y, otherRoom.Center.X, fillage)
	} else {
		digVTunnel(l, room.Center.Y, otherRoom.Center.Y, room.Center.Y, fillage)
		digHTunnel(l, room.Center.X, otherRoom.Center.X, otherRoom.Center.Y, fillage)
	}
}

func digHTunnel(l *gamemap.Level, x1, x2, y int, fillage types.RectFill) {
	var start, finish int
	if x1 < x2 {
		start = x1
		finish = x2
	} else {
		start = x2
		finish = x1
	}
	for i := start; i <= finish; i++ {
		if l.InBounds(types.Coords{i, y}) {
			l.SetTileByXY(i, y, fillage.Body.(func() *gamemap.Tile)())
			//l.Tiles[i][y] = gamemap.NewFloor()
		}
	}
}

func digVTunnel(l *gamemap.Level, y1, y2, x int, fillage types.RectFill) {
	var start, finish int
	if y1 < y2 {
		start = y1
		finish = y2
	} else {
		start = y2
		finish = y1
	}
	for i := start; i <= finish; i++ {
		if l.InBounds(types.Coords{x, i}) {
			l.SetTileByXY(x, i, fillage.Body.(func() *gamemap.Tile)())
		}
	}
}