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	/*
	Copyright © 2018 Write.as

	This file is part of the Write.as GTK desktop app.

	This program is free software: you can redistribute it and/or modify
	it under the terms of the GNU General Public License as published by
	the Free Software Foundation, either version 3 of the License, or
	(at your option) any later version.

	This program is distributed in the hope that it will be useful,
	but WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	GNU General Public License for more details.

	You should have received a copy of the GNU General Public License
	along with this program. If not, see <https://www.gnu.org/licenses/>.
	*/
	public class WriteAs.MainWindow : Gtk.ApplicationWindow {
	private Gtk.TextView canvas;
	private Gtk.HeaderBar header;
	private Gtk.ToggleButton darkmode_button;

	private static string data_dir = ".writeas";
	private static string version = "1.0.1";

	private int font_size = 16;
	private bool dark_mode = false;
	private string font = "Lora, 'Palatino Linotype',"
	+ "'Book Antiqua', 'New York', 'DejaVu serif', serif";
	private string fontstyle = "serif";
	private bool text_changed = false;

	private bool is_initializing = true;

	construct {
	header = new Gtk.HeaderBar();
	header.title = "Write.as";
	construct_toolbar();
	build_keyboard_shortcuts();

	var scrolled = new Gtk.ScrolledWindow(null, null);
	canvas = new Gtk.SourceView();
	canvas.wrap_mode = Gtk.WrapMode.WORD_CHAR;
	scrolled.add(canvas);
	add(scrolled);

	size_allocate.connect((_) => {adjust_text_style();});
	canvas.event_after.connect((evt) => {
	// TODO This word count algorithm may be quite naive
	// and could do improvement.
	var word_count = canvas.buffer.text.split(" ").length;
	header.subtitle = ngettext("%i word","%i words",word_count).printf(word_count);

	text_changed = true;
	});
	Timeout.add_full(Priority.DEFAULT_IDLE, 100/ms/, () => {
	if (!text_changed) return Source.CONTINUE;

	var text = canvas.buffer.text;
	// This happens sometimes for some reason, but it's difficult to debug.
	if (text == "") return Source.CONTINUE;

	try {
	draft_file().replace_contents(text.data, null, false,
	FileCreateFlags.PRIVATE \| FileCreateFlags.REPLACE_DESTINATION,
	null);
	text_changed = false;
	} catch (Error err) {/* We'll try again anyways. */}

	return Source.CONTINUE;
	});

	adjust_text_style(false);

	}

	public MainWindow(Gtk.Application app) {
	stdout.printf("writeas-gtk v%s\n", version);

	set_application(app);
	icon_name = "com.github.writeas.writeas-gtk";
	init_folder();
	try {
	open_file(draft_file());
	} catch (Error err) {}
	restore_styles();

	set_default_size(800, 600);
	is_initializing = false;
	}

	private static void init_folder() {
	var home = File.new_for_path(get_data_dir());
	try {
	home.make_directory();
	} catch (Error e) {
	stderr.printf("Create data dir: %s\n", e.message);
	}
	}

	private static string get_data_dir() {
	return Environment.get_home_dir() + "/" + data_dir;
	}

	private static File draft_file() {
	var home = File.new_for_path(get_data_dir());
	return home.get_child("draft.txt");
	}

	private static bool supports_dark_theme() {
	var theme = Gtk.Settings.get_default().gtk_theme_name;

	foreach (var datapath in Environment.get_system_data_dirs()) {
	var path = File.new_for_path(Path.build_filename(datapath, "themes", theme));
	if (path.get_child("gtk-dark.css").query_exists()) return true;

	try {
	var enumerator = path.enumerate_children("standard::*", 0);
	FileInfo info = null;
	while ((info = enumerator.next_file()) != null) {
	var fullpath = path.get_child(info.get_name()).get_child("gtk-dark.css");
	if (fullpath.query_exists()) return true;
	}
	} catch (Error err) {/* Might be missing something, but no biggy. */}
	}

	return false;
	}

	private void construct_toolbar() {
	header.show_close_button = true;
	set_titlebar(header);

	var publish_button = new Gtk.Button.from_icon_name("document-send",
	Gtk.IconSize.SMALL_TOOLBAR);
	publish_button.tooltip_text = _("Publish to Write.as on the web");
	publish_button.clicked.connect(() => {
	canvas.buffer.text += "\n\n" + publish();

	canvas.grab_focus();
	});
	header.pack_end(publish_button);

	darkmode_button = new Gtk.ToggleButton();
	darkmode_button.tooltip_text = _("Toggle dark theme");
	// NOTE the fallback icon is a bit of a meaning stretch, but it works.
	var icon_theme = Gtk.IconTheme.get_default();
	darkmode_button.image = new Gtk.Image.from_icon_name(
	icon_theme.has_icon("writeas-bright-dark") ?
	"writeas-bright-dark" : "weather-clear-night",
	Gtk.IconSize.SMALL_TOOLBAR);
	darkmode_button.draw_indicator = false;
	var settings = Gtk.Settings.get_default();
	darkmode_button.toggled.connect(() => {
	settings.gtk_application_prefer_dark_theme = darkmode_button.active;
	dark_mode = darkmode_button.active;
	if (!is_initializing) theme_save();

	canvas.grab_focus();
	});
	if (supports_dark_theme()) header.pack_end(darkmode_button);

	var fonts = new Gtk.MenuButton();
	fonts.tooltip_text = _("Change document font");
	fonts.image = new Gtk.Image.from_icon_name("font-x-generic", Gtk.IconSize.SMALL_TOOLBAR);
	fonts.popup = new Gtk.Menu();
	header.pack_start(fonts);

	build_fontoption(fonts.popup, _("Serif"), "serif", font);
	build_fontoption(fonts.popup, _("Sans-serif"), "sans",
	"'Open Sans', 'Segoe UI', Tahoma, Arial, sans-serif");
	build_fontoption(fonts.popup, _("Monospace"), "wrap", "Hack, consolas," +
	"Menlo-Regular, Menlo, Monaco, 'ubuntu mono', monospace");
	fonts.popup.show_all();
	}

	private unowned SList<Gtk.RadioMenuItem>? font_options = null;
	private void build_fontoption(Gtk.Menu menu,
	string label, string fontstyle, string families) {
	var option = new Gtk.RadioMenuItem.with_label(font_options, label);
	font_options = option.get_group();
	option.activate.connect(() => {
	this.font = families;
	this.fontstyle = fontstyle;
	adjust_text_style(!is_initializing);

	canvas.grab_focus();
	});

	var styles = option.get_style_context();
	var provider = new Gtk.CssProvider();
	try {
	provider.load_from_data("* {font-family: %s;}".printf(families));
	styles.add_provider(provider, Gtk.STYLE_PROVIDER_PRIORITY_APPLICATION);
	} catch (Error e) {
	warning(e.message);
	}

	menu.add(option);
	}

	public override void grab_focus() {
	canvas.grab_focus();
	}

	private KeyFile theme = new KeyFile();
	private void restore_styles() {
	try {
	loaded_theme = true;

	theme.load_from_file(get_data_dir() + "/prefs.ini", KeyFileFlags.NONE);

	dark_mode = theme.get_boolean("Theme", "darkmode");
	darkmode_button.set_active(dark_mode);
	Gtk.Settings.get_default().gtk_application_prefer_dark_theme = dark_mode;
	font_size = theme.get_integer("Theme", "fontsize");
	font = theme.get_string("Post", "font");
	fontstyle = theme.get_string("Post", "fontstyle");

	adjust_text_style(false);
	} catch (Error err) {/* No biggy... */}
	}

	private Gtk.CssProvider cur_styles = null;
	// So the theme isn't read before it's saved.
	private bool loaded_theme = false;
	private void adjust_text_style(bool save_theme = true) {
	try {
	if (cur_styles != null)
	Gtk.StyleContext.remove_provider_for_screen(Gdk.Screen.get_default(), cur_styles);

	var padding = canvas.get_allocated_width()*0.10;
	var css = ("textview {font-family: %s; font-size: %dpx; padding: 20px;" +
	" padding-left: %ipx; padding-right: %ipx;" +
	" caret-color: #5ac4ee;}").printf(font, font_size,
	(int) padding, (int) padding);
	cur_styles = new Gtk.CssProvider();
	cur_styles.load_from_data(css);

	Gtk.StyleContext.add_provider_for_screen(Gdk.Screen.get_default(),
	cur_styles, Gtk.STYLE_PROVIDER_PRIORITY_APPLICATION);

	if (save_theme) theme_save();
	} catch (Error e) {
	warning(e.message);
	}
	}

	private void theme_save() {
	if (!loaded_theme) return;
	theme.set_boolean("Theme", "darkmode", dark_mode);
	theme.set_integer("Theme", "fontsize", font_size);
	theme.set_string("Post", "font", font);
	theme.set_string("Post", "fontstyle", fontstyle);

	try {
	theme.save_to_file(get_data_dir() + "/prefs.ini");
	} catch (FileError err) {/* Oh well. */}
	}

	private string publish() {
	try {
	if (text_changed) {;
	draft_file().replace_contents(canvas.buffer.text.data, null, false,
	FileCreateFlags.PRIVATE \| FileCreateFlags.REPLACE_DESTINATION,
	null);
	text_changed = false;
	}

	var cmd = "sh -c 'cat ~/" + data_dir + "/draft.txt \| writeas --md --font %s --user-agent \"writeas-gtk v" + version + "\"'";
	cmd = cmd.printf(fontstyle);
	string stdout, stderr;
	int status;
	Process.spawn_command_line_sync(cmd,
	out stdout, out stderr, out status);

	// Open it in the browser
	if (status == 0) {
	var browser = AppInfo.get_default_for_uri_scheme("https");
	var urls = new List<string>();
	urls.append(stdout.strip());
	browser.launch_uris(urls, null);
	}

	return stderr.strip();
	} catch (Error err) {
	return err.message;
	}
	}
	/* --- */

	private void build_keyboard_shortcuts() {
	/* These operations are not exposed to the UI as buttons,
	as most people are very familiar with them and they are not the
	focus of this app. */
	var accels = new Gtk.AccelGroup();

	// App operations
	accels.connect(Gdk.Key.W, Gdk.ModifierType.CONTROL_MASK,
	Gtk.AccelFlags.VISIBLE \| Gtk.AccelFlags.LOCKED,
	(g,a,k,m) => quit());
	accels.connect(Gdk.Key.Q, Gdk.ModifierType.CONTROL_MASK,
	Gtk.AccelFlags.VISIBLE \| Gtk.AccelFlags.LOCKED,
	(g,a,k,m) => quit());

	// File operations
	accels.connect(Gdk.Key.S, Gdk.ModifierType.CONTROL_MASK,
	Gtk.AccelFlags.VISIBLE \| Gtk.AccelFlags.LOCKED,
	(g,a,k,m) => save_as());
	accels.connect(Gdk.Key.S,
	Gdk.ModifierType.CONTROL_MASK \| Gdk.ModifierType.SHIFT_MASK,
	Gtk.AccelFlags.VISIBLE \| Gtk.AccelFlags.LOCKED,
	(g,a,k,m) => save_as());

	// Adjust text size
	accels.connect(Gdk.Key.minus, Gdk.ModifierType.CONTROL_MASK, Gtk.AccelFlags.VISIBLE \| Gtk.AccelFlags.LOCKED, (g,a,k,m) => {
	if (font_size < 3) {
	return false;
	}
	if (font_size <= 10) {
	font_size -= 1;
	} else {
	font_size -= 2;
	}
	adjust_text_style(true);
	return true;
	});
	accels.connect(Gdk.Key.equal, Gdk.ModifierType.CONTROL_MASK, Gtk.AccelFlags.VISIBLE \| Gtk.AccelFlags.LOCKED, (g,a,k,m) => {
	if (font_size < 10) {
	font_size += 1;
	} else {
	font_size += 2;
	}
	adjust_text_style(true);
	return true;
	});

	// Toggle theme with Ctrl+T
	accels.connect(Gdk.Key.T, Gdk.ModifierType.CONTROL_MASK, Gtk.AccelFlags.VISIBLE \| Gtk.AccelFlags.LOCKED, (g,a,k,m) => {
	darkmode_button.set_active(!darkmode_button.get_active());
	return true;
	});

	// Publish with Ctrl+Enter
	accels.connect(Gdk.Key.Return, Gdk.ModifierType.CONTROL_MASK, Gtk.AccelFlags.VISIBLE \| Gtk.AccelFlags.LOCKED, (g,a,k,m) => {
	canvas.buffer.text += "\n\n" + publish();
	return true;
	});

	add_accel_group(accels);
	}

	private bool save_as() {
	try {
	var file = prompt_file(Gtk.FileChooserAction.SAVE, _("Save as"));
	file.replace_contents(canvas.buffer.text.data, null, false,
	FileCreateFlags.PRIVATE \| FileCreateFlags.REPLACE_DESTINATION,
	null);
	} catch (Error e) {
	// It's fine...
	}
	return true;
	}

	private File prompt_file(Gtk.FileChooserAction mode, string action)
	throws UserCancellable {
	var file_chooser = new Gtk.FileChooserDialog(action, this, mode,
	_("Cancel"), Gtk.ResponseType.CANCEL,
	action, Gtk.ResponseType.ACCEPT);

	file_chooser.select_multiple = false;
	var filter = new Gtk.FileFilter();
	filter.add_mime_type("text/plain");
	file_chooser.set_filter(filter);

	var resp = file_chooser.run();
	file_chooser.close();
	if (resp == Gtk.ResponseType.ACCEPT) {
	return file_chooser.get_file();
	} else {
	throw new UserCancellable.USER_CANCELLED("FileChooserDialog");
	}
	}

	public void open_file(File file) throws Error {
	uint8[] text;
	file.load_contents(null, out text, null);
	canvas.buffer.text = (string) text;
	}

	private bool quit() {
	this.close();
	return true;
	}
	}

	errordomain WriteAs.UserCancellable {USER_CANCELLED}

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