local Luan = require "luan:Luan.luan"
local error = Luan.error
local ipairs = Luan.ipairs or error()
local Io = require "luan:Io.luan"
local print = Io.print or error()
local new_file = Io.schemes.file or error()
local Swing = require "luan:swing/Swing.luan"
local new_frame = require("luan:swing/Frame.luan").new or error()
local new_label = require("luan:swing/Label.luan").new or error()
local new_text_area = require("luan:swing/Text_area.luan").new or error()
local new_scroll_pane = require("luan:swing/Scroll_pane.luan").new or error()
local new_list = require("luan:swing/List.luan").new or error()
local new_menu_bar = require("luan:swing/Menu_bar.luan").new or error()
local new_menu = require("luan:swing/Menu.luan").new or error()
local new_menu_item = require("luan:swing/Menu_item.luan").new or error()
local new_check_box_menu_item = require("luan:swing/Check_box_menu_item.luan").new or error()
local Logging = require "luan:logging/Logging.luan"
local logger = Logging.logger "editor"


local new_window

local function make_menu_bar(window)
	local menu_bar = new_menu_bar()
	do
		local file_menu = new_menu()
		file_menu.text = "File"
		do
			local new_file = new_menu_item()
			new_file.text = "New File"
			new_file.accelerator = "meta N"
			new_file.add_action_listener(function()
				new_window()
			end)
			file_menu.add(new_file)
		end
		do
			local open = new_menu_item()
			open.text = "Open..."
			open.accelerator = "meta O"
			open.add_action_listener(function()
				local file_chooser = window.frame.file_chooser_load()
				if window.file ~= nil then
					file_chooser.directory = window.file.parent()
				end
				file_chooser.visible = true
				local file = file_chooser.file
				if file ~= nil then
					new_window(file)
				end
			end)
			file_menu.add(open)
		end
		do
			local save = new_menu_item()
			save.text = "Save"
			save.accelerator = "meta S"
			save.add_action_listener(function()
				if window.file == nil then
					local file_chooser = window.frame.file_chooser_save()
					file_chooser.visible = true
					local file = file_chooser.file
					if file == nil then
						return
					end
					window.file = file
					window.frame.title = file.canonical().to_string()
				end
				window.file.write_text(window.text_area.text)
			end)
			file_menu.add(save)
		end
		menu_bar.add(file_menu)
	end
	do
		local view_menu = new_menu()
		view_menu.text = "View"
		do
			local word_wrap = new_check_box_menu_item()
			word_wrap.text = "Word Wrap"
			word_wrap.state = window.text_area.line_wrap
			word_wrap.add_action_listener(function()
				window.text_area.line_wrap = word_wrap.state
			end)
			view_menu.add(word_wrap)
		end
		menu_bar.add(view_menu)
	end
	return menu_bar
end

local n_windows = 0

function new_window(file)
	local frame = new_frame()
	frame.title = file and file.canonical().to_string() or "new"
	frame.add_close_listener(function()
		n_windows = n_windows - 1
		if n_windows == 0 then
			Luan.exit()
		end
	end)
	local text_area = new_text_area()
	if file ~= nil and file.is_file() then
		text_area.text = file.read_text()
	end
	text_area.rows = 10
	text_area.columns = 20
	text_area.wrap_style_word = true
	text_area.line_wrap = true
	text_area.tab_size = 4
	text_area.set_font{ family="Monospaced", size=13 }
	text_area.select(0,0)
	--print(text_area.line_count)
	local scroll_pane = new_scroll_pane(text_area)
	local list = new_list()
	list.add_element("1")
	list.add_element("2")
	list.add_element("3")
	--scroll_pane.set_row_header_view(list)
	frame.add(scroll_pane)
	local window = {
		frame = frame
		file = file
		text_area = text_area
	}
	local menu_bar = make_menu_bar(window)
	frame.set_menu_bar(menu_bar)
	frame.pack()
	frame.visible = true
	text_area.request_focus_in_window()
	n_windows = n_windows + 1
end

Swing.run(function()
	local args = Luan.arg
	if #args == 0 then
		new_window()
	else
		for _, arg in ipairs(args) do
			local file = new_file(arg)
			new_window(file)
		end
	end
end)