extends PanelContainer
#warning-ignore-all:return_value_discarded

signal debug_pressed
signal savefile_loaded(dicts)

const globals = preload('res://globals.gd')  # Make LSP shut up about non-const
const FOLDER_ICON := globals.FOLDER_ICON
const ALLOWED_EXTS := globals.ALLOWED_EXTS
const CD_EXTS := globals.CD_EXTS
const EXT_ICONS := globals.EXT_ICONS
const TYPE_DESCS := globals.TYPE_DESCS

enum {SELECT_ROM, SELECT_SAVE, COMPLETE}
var current_mode = SELECT_ROM

var uploaded_files := {}  # filename: data
var uploaded_files_types := {}  # filename: type

var cached_cd_bin_paths := {}
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_load: Button = $'%btn_load'
onready var btn_debug: Button = $'%btn_debug'
onready var lbl_filename_header: Label = $'%lbl_filename_header'
onready var lbl_filename_content: Label = $'%lbl_filename_content'
onready var lbl_filetype_header: Label = $'%lbl_filetype_header'
onready var lbl_filetype_content: Label = $'%lbl_filetype_content'
onready var lbl_filesize_header: Label = $'%lbl_filesize_header'
onready var lbl_filesize_content: Label = $'%lbl_filesize_content'
onready var lbl_fileinfo_header: Label = $'%lbl_fileinfo_header'
onready var lbl_fileinfo_content: Label = $'%lbl_fileinfo_content'
onready var splash_filter := $'%splash_filter'
onready var splash_label := $'%splash_label'
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():
	# for child in folder_buttons.get_children():
	# 	child.queue_free()

	itemlist.clear()
	var files := []
	for entry in uploaded_files.keys():
		if entry in cached_cd_bin_paths:
			files.append([entry, EXT_ICONS.iso])
		elif '.' in entry:
			var extension = entry.rsplit('.', true, 1)[1]
			if extension in ALLOWED_EXTS:
				files.append([entry, EXT_ICONS.get(extension)])
	files.sort()
	for entry in files:
		itemlist.add_item(entry[0], entry[1])

func load_file(entry: String):
	var ext = entry.rsplit('.', true, 1)[1].to_lower()
	match ext:
		'sfc', 'smc':
			if true:  # current_mode == SELECT_ROM:
				splash_filter.visible = true
				splash_label.text = 'Loading ROM: %s'%filename
				var scenetree := get_tree()
				if scenetree:
					yield(scenetree, 'idle_frame')
				RomLoader.load_snes_rom_from_bytes(uploaded_files[entry])
		'srm':
			if current_mode != SELECT_ROM:
				emit_signal('savefile_loaded', SaveLoader.load_save_dicts_from_bytes(uploaded_files[entry]))
				_set_mode(COMPLETE)

func activate_entry(entry: String, _index: int = -1):
	load_file(entry)

func activate_current_entry():
	var selected := itemlist.get_selected_items()
	if len(selected) > 0:
		activate_entry(itemlist.get_item_text(selected[0]))

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

	var size = len(uploaded_files[entry])
	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: String = uploaded_files_types[entry]
	if ext in CD_EXTS:
		pass # TODO: Update cd image loader to accept PoolByteArray or a buffer view
#		var cd := RomLoader.loader_cd_image.new(uploaded_files[entry])
#		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[entry] = 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
	match current_mode:
		SELECT_ROM:
			btn_load.disabled = (ext != 'sfc' and ext != 'smc')  # Only allow opening snes roms for now
		SELECT_SAVE, COMPLETE:
			btn_load.disabled = (ext != 'srm')

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 _upload_file(filename: String, file_type: String, data):  # data is Javascript ArrayBuffer, which should be castable to PoolByteArray
	uploaded_files[filename] = data
	uploaded_files_types[filename] = file_type
	print('uploaded "%s" with filesize %d bytes'%[filename, len(data)])
	update_view()

func _files_dropped(filenames: PoolStringArray, screen_idx: int) -> void:
	print('Files Dropped signal: screen=%d, files='%screen_idx, filenames)
	for filename in filenames:
		var ext: String = filename.rsplit('.', true, 1)[1]
		if ext in ALLOWED_EXTS:
			var file := File.new()
			match file.open(filename, File.READ):
				OK:
					var rom_size := file.get_len()
					var data := file.get_buffer(rom_size)
					uploaded_files[filename] = data
					uploaded_files_types[filename] = ext
					print('uploaded "%s" with filesize %d bytes'%[filename, len(data)])
					update_view()
					load_file(filename)
				var error:
					print_debug('Error %d loading filename:'%error, filename)

func _ready() -> void:
	if OS.get_name() != 'HTML5' or !OS.has_feature('JavaScript'):
		return
	init_labels()
	update_view()
	btn_load.connect('pressed', self, 'activate_current_entry')
	btn_debug.connect('pressed', self, '_on_debug_pressed')
	RomLoader.connect('rom_loaded', self, '_on_rom_loaded')
	RomLoader.connect('loading_stage_updated', self, '_on_loading_stage_updated')
	HTML5.connect('uploaded_file', self, '_upload_file')
	get_tree().connect('files_dropped', self, '_files_dropped')

func _set_mode(new_mode) -> void:
	match new_mode:
		SELECT_ROM:
			$'%lbl_prompt'.text = "Select a ROM from your device's storage"
			btn_debug.disabled = true
		SELECT_SAVE:
			$'%lbl_prompt'.text = "Select a save file from your device's storage"
			btn_debug.disabled = false
		COMPLETE:
			$'%lbl_prompt'.text = "Save file loaded"
			btn_debug.disabled = false
	current_mode = new_mode
	update_view()
	init_labels()

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)

func _on_btn_upload_pressed() -> void:
	HTML5.upload_file()

func _on_loading_stage_updated(stage: String) -> void:
	splash_label.text += '\n' + stage

func _on_rom_loaded() -> void:
	splash_filter.visible = false
	_set_mode(SELECT_SAVE)

func _on_debug_pressed() -> void:
	emit_signal('debug_pressed')