tool
class_name NewGamePanel
extends PopupPanel

signal start_triggered(config, texture)

const pref_path := "user://preferences.cfg"
const cached_artwork_path := "user://artwork.dat"

const easy_columns := 3
const easy_rows := 3
const easy_iterations := 4
const normal_columns := 4
const normal_rows := 4
const normal_iterations := 10
const hard_columns := 5
const hard_rows := 5
const hard_iterations := 30

const Utils = preload("res://src/Utils.gd")

export var window_scale_factor = 0.9 # how big the popup will be compared to screen
export var default_artwork_texture: Texture

var preferences = ConfigFile.new()
var fade_duration = 0.2
var fade_scale_factor = 0.9
var flip_duration = 0.4

onready var popup = $"."
onready var panel = $Panel
onready var edit_panel = $EditPanel
onready var tween = $Tween

onready var difficulty_container = $Panel/VBoxContainer/Difficulty
onready var easy_button = $Panel/VBoxContainer/Difficulty/Easy
onready var normal_button = $Panel/VBoxContainer/Difficulty/Normal
onready var hard_button = $Panel/VBoxContainer/Difficulty/Hard
onready var custom_button = $Panel/VBoxContainer/HBoxContainer/Custom

onready var preview = $Panel/VBoxContainer/ArtworkSource/Preview

onready var columns_spinbox = $EditPanel/VBoxContainer/Columns/SpinBox
onready var rows_spinbox = $EditPanel/VBoxContainer/Rows/SpinBox
onready var iterations_spinbox = $EditPanel/VBoxContainer/Iterations/SpinBox

func _init():
	var err = preferences.load(pref_path)

func _ready():
	rect_pivot_offset = rect_size / 2

	assert(popup.theme != null)
	var popup_style : = popup.get_stylebox("panel", "PopupPanel") as StyleBoxFlat
	assert(popup_style != null)
	var panel_style := panel.get_stylebox("panel", "Panel") as StyleBoxFlat
	assert(panel_style != null)
	var modified_panel_style = panel_style.duplicate()
	modified_panel_style.corner_radius_bottom_left = popup_style.corner_radius_bottom_left
	modified_panel_style.corner_radius_bottom_right = popup_style.corner_radius_bottom_right
	modified_panel_style.corner_radius_top_left = popup_style.corner_radius_top_left
	modified_panel_style.corner_radius_top_right = popup_style.corner_radius_top_right
	panel.set("custom_styles/panel", modified_panel_style)
	edit_panel.set("custom_styles/panel", modified_panel_style)
	panel.show()
	edit_panel.hide()
	edit_panel.hide()
	
	var button_max_width: int = $EditPanel/VBoxContainer.rect_size.x / 3.5
	var button_width := min(200, button_max_width)
	print_debug("button max width = ", button_max_width)
	easy_button.rect_min_size.x = button_width
	normal_button.rect_min_size.x = button_width
	hard_button.rect_min_size.x = button_width
	custom_button.rect_min_size.x = button_width

func fade_in():
	tween.remove_all()
	tween.interpolate_property(self, "rect_scale", Vector2(fade_scale_factor, fade_scale_factor), Vector2.ONE, fade_duration, Tween.TRANS_LINEAR, Tween.EASE_IN)
	tween.interpolate_property(self, "modulate:a", 0.0, 1.0, fade_duration, Tween.TRANS_LINEAR, Tween.EASE_IN)
	tween.start()

func fade_out():
	tween.remove_all()
	tween.interpolate_property(self, "rect_scale", Vector2.ONE, Vector2(fade_scale_factor, fade_scale_factor), fade_duration, Tween.TRANS_LINEAR, Tween.EASE_IN)
	tween.interpolate_property(self, "modulate:a", 1.0, 0.0, fade_duration, Tween.TRANS_LINEAR, Tween.EASE_IN)
	tween.interpolate_callback(self, fade_duration, "hide")
	tween.start()

func flip_over(new_panel: Panel) -> void:
	tween.remove_all()
	var mid_duration = flip_duration / 2.0
	tween.interpolate_property(self, "rect_scale:x", 1.0, 0.0, mid_duration)
	tween.interpolate_callback($Panel, mid_duration, "hide")
	tween.interpolate_callback(new_panel, mid_duration, "show")
	tween.interpolate_property(self, "rect_scale:x", 0.0, 1.0, mid_duration, Tween.TRANS_LINEAR, Tween.EASE_IN, mid_duration)
	tween.start()

func flip_back(previous_panel: Panel) -> void:
	_update_description()
	tween.remove_all()
	var mid_duration = flip_duration / 2.0
	tween.interpolate_property(self, "rect_scale:x", 1.0, 0.0, mid_duration)
	tween.interpolate_callback($Panel, mid_duration, "show")
	tween.interpolate_callback(previous_panel, mid_duration, "hide")
	tween.interpolate_property(self, "rect_scale:x", 0.0, 1.0, mid_duration, Tween.TRANS_LINEAR, Tween.EASE_IN, mid_duration)
	tween.start()

func _update_description():
	var columns := 0
	var rows := 0
	var iterations := 0
	if easy_button.pressed:
		columns = easy_columns
		rows = easy_rows
		iterations = easy_iterations
	if normal_button.pressed:
		columns = normal_columns
		rows = normal_rows
		iterations = normal_iterations
	if hard_button.pressed:
		columns = hard_columns
		rows = hard_rows
		iterations = hard_iterations
	if custom_button.pressed:
		columns = columns_spinbox.value as int
		rows = rows_spinbox.value as int
		iterations = iterations_spinbox.value as int
	
	var desc: RichTextLabel = $Panel/VBoxContainer/HBoxContainer/Description
#	$Panel/Description.text = "Dimension: %d x %d\nIterations: %d" % [columns, rows, iterations]
	desc.clear()
	
	desc.push_align(RichTextLabel.ALIGN_CENTER)
	desc.add_text("Board: ")
	
	desc.push_bold()
	desc.add_text("%d" % [columns])
	desc.pop()
	
	desc.add_text(" x ")
	
	desc.push_bold()
	desc.add_text("%d" % [rows])
	desc.pop()
	
	desc.newline()

	desc.add_text("Shuffle: ")

	desc.push_bold()
	desc.add_text("%d" % [iterations])
	desc.pop()

func _set_artwork(tex: Texture) -> void:
	preview.texture = tex
	
	var file = File.new()
	if file.open(cached_artwork_path, File.WRITE) != OK:
		assert(false)
	file.store_var(tex.get_data(), true)
	file.close()

#
# Signals
#
func _on_Cancel_pressed():
	fade_out()

func _on_Start_pressed():
	if easy_button.pressed:
		preferences.set_value("game", "difficulty", "easy")
		preferences.set_value("game", "columns", easy_columns)
		preferences.set_value("game", "rows", easy_rows)
		preferences.set_value("game", "shuffle_iterations", easy_iterations)
	if normal_button.pressed:
		preferences.set_value("game", "difficulty", "normal")
		preferences.set_value("game", "columns", normal_columns)
		preferences.set_value("game", "rows", normal_rows)
		preferences.set_value("game", "shuffle_iterations", normal_iterations)
	if hard_button.pressed:
		preferences.set_value("game", "difficulty", "hard")
		preferences.set_value("game", "columns", hard_columns)
		preferences.set_value("game", "rows", hard_rows)
		preferences.set_value("game", "shuffle_iterations", hard_iterations)
	if custom_button.pressed:
		preferences.set_value("game", "difficulty", "custom")
		preferences.set_value("game", "columns", columns_spinbox.value)
		preferences.set_value("game", "rows", rows_spinbox.value)
		preferences.set_value("game", "shuffle_iterations", iterations_spinbox.value)

	preferences.save(pref_path)

	emit_signal("start_triggered", preferences, preview.texture)
	fade_out()

func _on_NewGamePanel_about_to_show():
	var difficulty = preferences.get_value("game", "difficulty", "normal")
	easy_button.pressed = difficulty == "easy"
	normal_button.pressed = difficulty == "normal"
	hard_button.pressed = difficulty == "hard"
	custom_button.pressed = difficulty == "custom"
	
	columns_spinbox.value = preferences.get_value("game", "custom_columns", normal_columns)
	rows_spinbox.value = preferences.get_value("game", "custom_rows", normal_rows)
	iterations_spinbox.value = preferences.get_value("game", "custom_shuffle_iterations", normal_iterations)
	
	_update_description()
	
	preview.texture = Utils.deserialize_texture(cached_artwork_path)
	if preview.texture == null:
		preview.texture = default_artwork_texture

#	$Panel/Start.grab_focus()
	fade_in()

func _on_Edit_Cancel_pressed():
	columns_spinbox.value = preferences.get_value("game", "custom_columns", normal_columns)
	rows_spinbox.value = preferences.get_value("game", "custom_rows", normal_rows)
	iterations_spinbox.value = preferences.get_value("game", "custom_shuffle_iterations", normal_iterations)
	flip_back($EditPanel)

func _on_Edit_Save_pressed():
	print_debug(columns_spinbox.value)
	preferences.set_value("game", "custom_columns", columns_spinbox.value as int)
	preferences.set_value("game", "custom_rows", rows_spinbox.value as int)
	preferences.set_value("game", "custom_shuffle_iterations", iterations_spinbox.value as int)
	flip_back($EditPanel)

func _on_Easy_pressed():
	_update_description()

func _on_Normal_pressed():
	_update_description()

func _on_Hard_pressed():
	_update_description()

func _on_Custom_pressed():
	_update_description()
	flip_over($EditPanel)

func _on_LoadImage_pressed():
	flip_over($ImagePicker)

#func _on_ImagePicker_file_selected(path):
#	print_debug(path)
#	var texture := load(path)
#	if texture == null:
#		print_debug("Cannot load image from path: ", path)
#		return
#	preview.texture = texture
#
#	var file = File.new()
#	file.store_var(texture)
#
#	var directory = Directory.new()	
#	# TODO: remove previous artwork.png, artwork.jpg files
#	var cached_artwork_path := "user://artwork.%s" % [path.get_extension()]
#	var error = directory.copy(path, cached_artwork_path)
#	if error != OK:
#		print_debug("Cannot cache image")
#		_artwork_path = path
#	else:
#		_artwork_path = cached_artwork_path
#	flip_back($ImagePicker)

func _on_ImagePicker_canceled():
	flip_back($ImagePicker)

func _on_ImagePicker_texture_selected(texture):
	_set_artwork(texture)
	flip_back($ImagePicker)