extends Node3D
class_name LevelGenerator

var levelGrid: Array[Array]
@export var gridSize: int = 250

var spawnableRooms: Array[RoomData]
var biomes: Array[Biome]
var rng := RandomNumberGenerator.new()

func _ready() -> void:
	initGrid()
	
	var spaceshipRoomList := RoomListSpaceship.new() # Have something choose the map in this part later
	spawnableRooms = spaceshipRoomList.rooms
	
	
	var temp: Array[DoorPosition]
	
	# Generate the level
	temp = spawnRoom(spawnableRooms[0],Vector2i(40,40),0,true)
	for x in temp:
		spawnRoomAtDoor(spawnableRooms[0],x)
	printLevelGrid()

func initGrid() -> void:
	for x in gridSize:
		var newRow: Array
		levelGrid.push_back(newRow)
		for y in gridSize:
			var newCell := GridCell.new()
			levelGrid[x].push_back(newCell)
func addGridCells(cell1: GridCell,cell2: GridCell) -> GridCell:
	var returnCell: GridCell = GridCell.new()
	returnCell.spaceTaken = cell1.spaceTaken or cell2.spaceTaken
	returnCell.door = cell2.door
	returnCell.doorOrientation = cell2.doorOrientation
	returnCell.biome = cell1.biome
	return returnCell
func addArrays2D(array1: Array[Array], array2: Array[Array], arr2pos: Vector2i = Vector2i(0,0)) -> void:
	if array1.size() < (arr2pos.x - 1) + array2.size(): return 
	if array1[arr2pos.y].size() < (arr2pos.y - 1) + array2[0].size(): return
	for x in array2.size():
		for y in array2[x].size():
			array1[x+arr2pos.x][y+arr2pos.y] = addGridCells(array1[x+arr2pos.x][y+arr2pos.y],array2[x][y])
func rotateArray2D(array: Array[Array], numberOfRotationsBy90Degrees: int = 1) -> void:
	var size: int = array.size()
	var layerCount: int = size/2
	
	for x in numberOfRotationsBy90Degrees%4:
		for layer in layerCount:
			var first: int = layer
			var last: int = size - first - 1
			
			for element in range(first, last):
				var offset = element - first
				
				var top = array[first][element]
				var right = array[element][last]
				var bot = array[last][last-offset]
				var left = array[last-offset][first]
				
				array[element][last] = top
				array[last][last-offset] = right
				array[last-offset][first] = bot
				array[first][element] = left
func getDoorPosition(cell: GridCell, GridCellPosition: Vector2i) -> DoorPosition:
	if !cell.door:
		print("Tried to get door at cell that isnt a door")
		return null
	var returnDoorPosition := DoorPosition.new()
	returnDoorPosition.pos = GridCellPosition
	returnDoorPosition.orientation = cell.doorOrientation
	return returnDoorPosition
func addObject(AddedObject:PackedScene, Parent: Node3D, Position: Vector3, Rotation: Vector3= Vector3(0,0,0)):
	if !AddedObject: 
		print("tried to add object but packed scene is null")
		return
	var obj = AddedObject.instantiate()
	Parent.add_child(obj)
	obj.position = Position
	obj.rotation = Rotation
	return obj
func rotateRoom(roomData: RoomData, numberOfRotationsBy90Degrees: int) -> void:
	rotateArray2D(roomData.roomGrid,numberOfRotationsBy90Degrees)
	for door in roomData.doorPositions:
		door.rotatePosRight(roomData.roomGrid.size(),numberOfRotationsBy90Degrees)
		door.orientation += numberOfRotationsBy90Degrees % 4
func spawnRoom(roomData: RoomData,pos: Vector2i,numberOfRotationsBy90Degrees: int = 0, centered: bool = false) -> Array[DoorPosition]: #Pos corresponds to the upper left corner of the room immage
	var roomScene: PackedScene = load(roomData.roomSceneRef)
	
	rotateRoom(roomData,numberOfRotationsBy90Degrees)
	var roomGrid := roomData.roomGrid
	var doorPositions: Array[DoorPosition] = roomData.doorPositions
	if centered:
		pos = Vector2i(pos.x-(roomGrid.size()/2),pos.y-(roomGrid[0].size()/2))
	
	addArrays2D(levelGrid,roomGrid,pos)
	addObject(roomScene,self,Vector3(pos.x+(roomGrid.size()/2),0,pos.y+(roomGrid[0].size()/2)),Vector3(0,(numberOfRotationsBy90Degrees%4)*PI/2,0))
	for door in doorPositions:
		door.pos += pos
	
	return doorPositions
func spawnRoomAtDoor(roomData: RoomData, door: DoorPosition) -> void:
	var spawnDoor: DoorPosition = roomData.doorPositions[rng.randi_range(0,roomData.doorPositions.size()-1)]
	var doorOrientationDifference : int = spawnDoor.orientation - door.orientation
	var numberOfRoomRotations: int = 0
	if !abs(doorOrientationDifference) == 2:
		if doorOrientationDifference > 0:
			numberOfRoomRotations = 1
		if doorOrientationDifference == 0:
			numberOfRoomRotations = 2
		if doorOrientationDifference < 0:
			numberOfRoomRotations = 3
	
	spawnRoom(roomData,door.pos,numberOfRoomRotations)
func printLevelGrid() -> void:
	var debugCube: PackedScene = preload("res://test/debugCube.tscn")
	for x in levelGrid.size():
		for y in levelGrid[x].size():
			if levelGrid[x][y].spaceTaken:
				addObject(debugCube,self,Vector3(x+0.5,0,y+0.5))