class_name Minefield extends Node2D

static var instance: Minefield

@onready var tilePrefab: PackedScene = preload("res://scenes/Tile.tscn")
@onready var cam: Camera2D = $Camera2D

@export var width: int = 10
@export var height: int = 10
@export var mineCount: int = 10
@export var startingSafeZone: int = 2

var tiles: Array[Tile]
var mines: Array[Tile]
var falseFlags: Array[Tile]
var spriteWidth: int = 16
var fieldInitialized: bool = false
var gameRunning: bool = true
var revealed: int = 0
var winCondition: int
var timer: int

func _enter_tree() -> void:
	if (instance == null || is_instance_valid(instance)): instance = self
	else: queue_free()

func _ready() -> void:
	var scale: float = 1
	winCondition = (width * height) - mineCount
	for x: int in range(width):
		for y: int in range(height):
			var tile: Tile = tilePrefab.instantiate()
			tile.coord = Vector2i(x, y)
			tile.position = Vector2(spriteWidth * x - (spriteWidth * (width / 2)) + (spriteWidth / 2),
									spriteWidth * y - (spriteWidth * (height / 2)) + (spriteWidth / 2))
			add_child(tile)
			tiles.append(tile)

func initField(coord: Vector2i) -> void:
	fieldInitialized = true
	var pickPool: Array[Tile] = tiles.duplicate()
	for i: int in range(mineCount):
		var pick: Tile = pickPool.pick_random()
		while (true):
			pickPool.erase(pick)
			if (abs(coord - pick.coord) >= Vector2i(startingSafeZone, startingSafeZone)):
				pick.type = Tile.TileTypes.MINE
				mines.append(pick)
				break
			pick = pickPool.pick_random()
	for tile: Tile in tiles:
		tile.evaluateType()
	timer = Time.get_ticks_msec()

func lose() -> void:
	gameRunning = false
	for mine: Tile in mines:
		await get_tree().create_timer(randf_range(0.01, 0.25)).timeout
		mine.reveal()
	for flag: Tile in falseFlags:
		await get_tree().create_timer(randf_range(0.01, 0.1)).timeout
		flag.breakFlag()

func tilesRevealed(count: int) -> void:
	revealed += count
	if (revealed == winCondition):
		gameRunning = false
		var completionTime: int = Time.get_ticks_msec() - timer
		var humanTime: float = float(completionTime) / 1000
		print("You win.\nCompleted in " + str(humanTime) + " seconds")

func getTile(coord: Vector2i) -> Tile:
	if (coord.x < 0 || coord.y < 0 || coord.x >= width || coord.y >= width): return null
	return tiles[(coord.x * height) + coord.y]