extends PanelContainer
#warning-ignore-all:return_value_discarded

const FOLDER_ICON := preload('res://theme/icon_folder.tres')
const ALLOWED_EXTS := PoolStringArray(['bin', 'iso', 'sfc', 'srm', 'gba'])
const CD_EXTS := PoolStringArray(['bin', 'iso'])  # If you have a weird disc image format, you can mount it yourself, leave me out of it
var EXT_ICONS := {  # Dicts can't be const
	'bin': preload('res://theme/icon_binary.tres'),
	'iso': preload('res://theme/icon_disc.tres'),
	'sfc': preload('res://theme/icon_cart.tres'),
	'gba': preload('res://theme/icon_cart.tres'),
}
var TYPE_DESCS := {  # Dicts can't be const
	'bin': 'Binary',
	'iso': 'CD-ROM Image',
	'sfc': 'SNES ROM',
	'gba': 'GBA ROM',
	'srm': 'SNES Savefile'
}

var cached_cd_bin_paths := {}
var dir := Directory.new()
var home_path := ''
onready var itemlist: ItemList = $VBoxContainer/HBoxContainer/PanelContainer/ItemList
onready var vscroller: VScrollBar = itemlist.get_child(0)
onready var folder_buttons_scroller: ScrollContainer = $VBoxContainer/ScrollContainer
onready var folder_buttons: HBoxContainer = $VBoxContainer/ScrollContainer/folder_buttons
onready var btn_ok: Button = $VBoxContainer/HBoxContainer/VBoxContainer/btn_ok
onready var lbl_filename_header: Label = $VBoxContainer/HBoxContainer/VBoxContainer/lbl_filename
onready var lbl_filename_content: Label = $VBoxContainer/HBoxContainer/VBoxContainer/mc/filename
onready var lbl_filetype_header: Label = $VBoxContainer/HBoxContainer/VBoxContainer/lbl_type
onready var lbl_filetype_content: Label = $VBoxContainer/HBoxContainer/VBoxContainer/mc2/filetype
onready var lbl_filesize_header: Label = $VBoxContainer/HBoxContainer/VBoxContainer/lbl_size
onready var lbl_filesize_content: Label = $VBoxContainer/HBoxContainer/VBoxContainer/mc3/filesize
onready var lbl_fileinfo_header: Label = $VBoxContainer/HBoxContainer/VBoxContainer/lbl_info
onready var lbl_fileinfo_content: Label = $VBoxContainer/HBoxContainer/VBoxContainer/mc4/fileinfo
const inactive_modulate_color := Color(0.5, 0.5, 0.5)
const active_modulate_color := Color.white
var last_dir := ''

static func get_human_size(n: int) -> String:
	if n > 0x100000000:
		return '%.2f GiB' % (n/float(0x40000000))
	if n > 0x400000:
		return '%.1f MiB' % (n/float(0x100000))
	if n > 0x1000:
		return '%.1f KiB' % (n/float(0x400))
	return '%d B' % n

static func tokenize_path(path: String) -> PoolStringArray:
	return path.rstrip('/').split('/', true)  # Allow empty means '/' will return ['']

static func join_path(tokens) -> String:
	var path = '/'.join(tokens)
	return path if path else '/'

func update_view():
	var error = dir.list_dir_begin(true, true)
	if error != OK:
		print_debug(error)
		return

	for child in folder_buttons.get_children():
		child.queue_free()
	var path = ProjectSettings.globalize_path(dir.get_current_dir())
	var cur_path: Array = tokenize_path(path)
	var l := len(cur_path)
	for i in l:
		var btn := Button.new()
		btn.connect('pressed', self, 'activate_entry', [join_path(cur_path.slice(0, i))])
		btn.text = cur_path[i]
		folder_buttons.add_child(btn)
		if i == 0:
			btn.text += '/'
		if i == l-1:
			btn.icon = FOLDER_ICON
	if last_dir.begins_with(path):  # i.e. we jumped up a level or more
		var last_path: Array = tokenize_path(last_dir)
		var l2 := len(last_path)
		for i in range(l, l2):
			var btn := Button.new()
			btn.connect('pressed', self, 'activate_entry', [join_path(last_path.slice(0, i))])
			btn.text = last_path[i]
			btn.modulate = inactive_modulate_color
			folder_buttons.add_child(btn)
	# Doesn't work thanks to frame delay
	# folder_buttons_scroller.set_h_scroll(9999)
	# folder_buttons_scroller.ensure_control_visible(folder_buttons_scroller.get_h_scrollbar())
	# folder_buttons_scroller.get_h_scrollbar().update()

	itemlist.clear()
	var directories := PoolStringArray()
	var current_dir := dir.get_current_dir()
	var files := []
	while true:
		var entry := dir.get_next()
		if len(entry) == 0:
			break
		var filename := current_dir + '/' + entry
		if filename in cached_cd_bin_paths:
			files.append([entry, EXT_ICONS.iso])
		elif dir.current_is_dir():
			directories.append(entry)
		elif '.' in entry:
			var extension = entry.rsplit('.', true, 1)[1]
			if extension in ALLOWED_EXTS:
				files.append([entry, EXT_ICONS.get(extension)])
	directories.sort()
	files.sort()
	for entry in directories:
		itemlist.add_item(entry, FOLDER_ICON)
	for entry in files:
		itemlist.add_item(entry[0], entry[1])

func activate_entry(entry: String, _index: int = -1):
	var curr_dir := dir.get_current_dir()
	if not self.last_dir.begins_with(curr_dir):
		self.last_dir = curr_dir
	if dir.dir_exists(entry):
		var error := dir.change_dir(entry)
		if error == OK:
			update_view()
		else:
			print_debug(error)
	elif dir.file_exists(entry):
		pass  # Load the file

func view_entry(entry: String, index: int = -1):
	init_labels()
	lbl_filename_header.modulate = active_modulate_color
	lbl_filename_content.text = entry
	lbl_filetype_header.modulate = active_modulate_color
	if dir.dir_exists(entry):
		lbl_filetype_content.text = 'Folder'
	elif dir.file_exists(entry):
		var file := File.new()
		var filename := dir.get_current_dir() + '/' + entry
		var error := file.open(filename, File.READ)
		if error != OK:
			print_debug(error)
			return
		var size = file.get_len()
		var human_size = get_human_size(size)
		var ext = entry.rsplit('.', true, 1)[1].to_lower()
		var type = TYPE_DESCS.get(ext, 'Unknown')
		var prodcode := ''
		if ext in CD_EXTS:
			var cd := RomLoader.loader_cd_image.new(file)
			for key in cd.directory:
				var s = key.trim_prefix('./')
				var re_match := RomLoader.psx_productcode_regex.search(s)
				if re_match:
					prodcode = '%s\n   %s\n   %s' % [cd.pvd.system_identifier.strip_edges(), cd.pvd.volume_identifier.strip_edges(), re_match.get_string(1)]
					type = 'PSX CD-ROM Image'
					cached_cd_bin_paths[filename] = prodcode
					if index >= 0:
						itemlist.set_item_icon(index, EXT_ICONS.iso)
					break
		var info = ('Info:\n   %s' % prodcode) if prodcode else ''
		lbl_filetype_content.text = type
		lbl_filesize_header.modulate = active_modulate_color
		lbl_filesize_content.text = human_size
		lbl_fileinfo_header.modulate = active_modulate_color if prodcode else inactive_modulate_color
		lbl_fileinfo_content.text = prodcode

func init_labels():
	lbl_filename_header.modulate = inactive_modulate_color
	lbl_filename_content.text = ''
	lbl_filetype_header.modulate = inactive_modulate_color
	lbl_filetype_content.text = ''
	lbl_filesize_header.modulate = inactive_modulate_color
	lbl_filesize_content.text = ''
	lbl_fileinfo_header.modulate = inactive_modulate_color
	lbl_fileinfo_content.text = ''

func _ready() -> void:
	init_labels()
	if OS.has_feature('windows'):
		home_path = OS.get_environment('USERPROFILE')
	else:
		home_path = OS.get_environment('HOME')
	# dir.open(OS.get_system_dir(OS.SYSTEM_DIR_DOWNLOADS))
	var error = dir.open(home_path)
	if error == OK:
		update_view()
	print(ProjectSettings.globalize_path('user://'))
	print(ProjectSettings.globalize_path(dir.get_current_dir()))


func _on_ItemList_item_activated(index: int) -> void:
	activate_entry(itemlist.get_item_text(index), index)


func _on_ItemList_item_selected(index: int) -> void:
	view_entry(itemlist.get_item_text(index), index)