#include "sameboy_application.h"
#include "widgets/main_window.h"
#include "widgets/about_dialog.h"
#include "widgets/preferences_window.h"

#define str(x) #x
#define xstr(x) str(x)

#define action_set_enabled(map, name, value) \
	g_simple_action_set_enabled( \
		G_SIMPLE_ACTION( \
			g_action_map_lookup_action(G_ACTION_MAP(map), name) \
		), \
		value \
	);

struct _SameBoyApplication {
	GtkApplication parent;

	const GThread *main_thread;
	PreferencesWindow *preferences;
	AboutDialog *about_dialog;

	struct CliOptionData {
		gchar *config_path;
		gchar *boot_rom_path;
		gboolean fullscreen;
		GB_model_t model;
		gboolean force_software_renderer;
	} cli_options;
};

G_DEFINE_TYPE(SameBoyApplication, sameboy_application, GTK_TYPE_APPLICATION);

static void sameboy_application_init(SameBoyApplication *app) {
	g_debug("sameboy_application_init");

	// Define our command line parameters
	GOptionEntry entries[] = {
		{ "version",    'v', G_OPTION_FLAG_NONE, G_OPTION_ARG_NONE,   NULL, "Show the application version", NULL },
		{ "fullscreen", 'f', G_OPTION_FLAG_NONE, G_OPTION_ARG_NONE,   &app->cli_options.fullscreen, "Start in fullscreen mode", NULL },
		{ "bootrom",    'b', G_OPTION_FLAG_NONE, G_OPTION_ARG_STRING, &app->cli_options.boot_rom_path, "Path to the boot ROM to use", "<file path>" },
		{ "model",      'm', G_OPTION_FLAG_NONE, G_OPTION_ARG_STRING, NULL, "Override the model type to emulate", "<model type>" },
		{ "config",     'c', G_OPTION_FLAG_NONE, G_OPTION_ARG_STRING, &app->cli_options.config_path, "Override the path of the configuration file", "<file path>" },
		{ "no-gl",      's', G_OPTION_FLAG_NONE, G_OPTION_ARG_NONE,   &app->cli_options.force_software_renderer, "Do not use OpenGL for rendering", NULL },
		{ NULL }
	};

	// Setup our command line information
	g_application_add_main_option_entries(G_APPLICATION(app), entries);
	g_application_set_option_context_parameter_string(G_APPLICATION(app), "[FILE…]");
	g_application_set_option_context_summary(G_APPLICATION(app), "SameBoy is an open source Game Boy (DMG) and Game Boy Color (CGB) emulator.");
}

static gint sameboy_application_handle_local_options(GApplication *gapp, GVariantDict *options) {
	SameBoyApplication *app = SAMEBOY_APPLICATION(gapp);
	g_debug("sameboy_application_handle_local_options");

	guint32 count;
	if (g_variant_dict_lookup(options, "version", "b", &count)) {
		g_message("SameBoy v" xstr(VERSION));
		return EXIT_SUCCESS;
	}

	// Handle model override
	GVariant *model_name_var = g_variant_dict_lookup_value(options, "model", G_VARIANT_TYPE_STRING);
	if (model_name_var != NULL) {
		const gchar *model_name = g_variant_get_string(model_name_var, NULL);

		// TODO: Synchronize with GB_model_t (Core/gb.h)
		if (g_str_has_prefix(model_name, "DMG")) {
			if (g_str_has_suffix(model_name, "-B") || g_strcmp0(model_name, "DMG") == 0) {
				app->cli_options.model = GB_MODEL_DMG_B;
			}
			else {
				app->cli_options.model = GB_MODEL_DMG_B;
				g_warning("Unsupported revision: %s\nFalling back to DMG-B", model_name);
			}
		}
		else if (g_str_has_prefix(model_name, "SGB")) {
			if (g_str_has_suffix(model_name, "-NTSC") || g_strcmp0(model_name, "SGB") == 0) {
				app->cli_options.model = GB_MODEL_SGB;
			}
			else if (g_str_has_suffix(model_name, "-PAL")) {
				app->cli_options.model = GB_MODEL_SGB | GB_MODEL_PAL_BIT;
			}
			else if (g_str_has_suffix(model_name, "2")) {
				app->cli_options.model = GB_MODEL_SGB2;
			}
			else {
				app->cli_options.model = GB_MODEL_SGB2;
				g_warning("Unsupported revision: %s\nFalling back to SGB2", model_name);
			}
		}
		else if (g_str_has_prefix(model_name, "CGB")) {
			if (g_str_has_suffix(model_name, "-C")) {
				app->cli_options.model = GB_MODEL_CGB_C;
			}
			else if (g_str_has_suffix(model_name, "-E") || g_strcmp0(model_name, "CGB") == 0) {
				app->cli_options.model = GB_MODEL_CGB_E;
			}
			else {
				app->cli_options.model = GB_MODEL_CGB_E;
				g_warning("Unsupported revision: %s\nFalling back to CGB-E", model_name);
			}
		}
		else if (g_str_has_prefix(model_name, "AGB")) {
			app->cli_options.model = GB_MODEL_AGB;
		}
		else {
			g_warning("Unknown model: %s", model_name);
			exit(EXIT_FAILURE);
		}
	}

	return G_APPLICATION_CLASS(sameboy_application_parent_class)->handle_local_options(G_APPLICATION(app), options);
}

static void activate_open(GSimpleAction *action, GVariant *parameter, gpointer user_data) {
	SameBoyApplication *app = SAMEBOY_APPLICATION(user_data);
	MainWindow *window = SAMEBOY_MAIN_WINDOW(gtk_application_get_active_window(GTK_APPLICATION(app)));
}

static void activate_close(GSimpleAction *action, GVariant *parameter, gpointer user_data) {
	SameBoyApplication *app = SAMEBOY_APPLICATION(user_data);
	MainWindow *window = SAMEBOY_MAIN_WINDOW(gtk_application_get_active_window(GTK_APPLICATION(app)));
}

static void activate_reset(GSimpleAction *action, GVariant *parameter, gpointer user_data) {
	SameBoyApplication *app = SAMEBOY_APPLICATION(user_data);
	MainWindow *window = SAMEBOY_MAIN_WINDOW(gtk_application_get_active_window(GTK_APPLICATION(app)));
}

static void on_pause_changed(GSimpleAction *action, GVariant *parameter, gpointer user_data) {
	SameBoyApplication *app = SAMEBOY_APPLICATION(user_data);
	MainWindow *window = SAMEBOY_MAIN_WINDOW(gtk_application_get_active_window(GTK_APPLICATION(app)));
}

static void activate_show_console(GSimpleAction *action, GVariant *parameter, gpointer user_data) {
	SameBoyApplication *app = SAMEBOY_APPLICATION(user_data);
	MainWindow *window = SAMEBOY_MAIN_WINDOW(gtk_application_get_active_window(GTK_APPLICATION(app)));
	main_window_open_console_window(window);
}

static void activate_open_memory_viewer(GSimpleAction *action, GVariant *parameter, gpointer user_data) {
	SameBoyApplication *app = SAMEBOY_APPLICATION(user_data);
	MainWindow *window = SAMEBOY_MAIN_WINDOW(gtk_application_get_active_window(GTK_APPLICATION(app)));
	main_window_open_memory_viewer_window(window);
}

static void activate_open_vram_viewer(GSimpleAction *action, GVariant *parameter, gpointer user_data) {
	SameBoyApplication *app = SAMEBOY_APPLICATION(user_data);
	MainWindow *window = SAMEBOY_MAIN_WINDOW(gtk_application_get_active_window(GTK_APPLICATION(app)));
	main_window_open_vram_viewer_window(window);
}

static void activate_break_debugger(GSimpleAction *action, GVariant *parameter, gpointer user_data) {
	SameBoyApplication *app = SAMEBOY_APPLICATION(user_data);
	MainWindow *window = SAMEBOY_MAIN_WINDOW(gtk_application_get_active_window(GTK_APPLICATION(app)));
}

static void on_developer_mode_changed(GSimpleAction *action, GVariant *parameter, gpointer user_data) {
	SameBoyApplication *app = SAMEBOY_APPLICATION(user_data);
	MainWindow *window = SAMEBOY_MAIN_WINDOW(gtk_application_get_active_window(GTK_APPLICATION(app)));
}

static void activate_clear_console(GSimpleAction *action, GVariant *parameter, gpointer user_data) {
	SameBoyApplication *app = SAMEBOY_APPLICATION(user_data);
	MainWindow *window = SAMEBOY_MAIN_WINDOW(gtk_application_get_active_window(GTK_APPLICATION(app)));
}

static void activate_open_gtk_debugger(GSimpleAction *action, GVariant *parameter, gpointer user_data) {
	gtk_window_set_interactive_debugging(true);
}

static void activate_quit(GSimpleAction *action, GVariant *parameter, gpointer user_data) {
	SameBoyApplication *app = SAMEBOY_APPLICATION(user_data);
	MainWindow *window = SAMEBOY_MAIN_WINDOW(gtk_application_get_active_window(GTK_APPLICATION(app)));
}

/**
 * Opens the global about dialog.
 */
static void activate_about(GSimpleAction *action, GVariant *parameter, gpointer user_data) {
	SameBoyApplication *app = SAMEBOY_APPLICATION(user_data);
	gtk_dialog_run(GTK_DIALOG(app->about_dialog));
	gtk_widget_hide(GTK_WIDGET(app->about_dialog));
}

/**
 * Opens the global preferences menu.
 */
static void activate_preferences(GSimpleAction *action, GVariant *parameter, gpointer user_data) {
	SameBoyApplication *app = SAMEBOY_APPLICATION(user_data);
	gtk_widget_show_all(GTK_WIDGET(app->preferences));
}

static void on_mute_changed(GSimpleAction *action, GVariant *parameter, gpointer user_data) {
	SameBoyApplication *app = SAMEBOY_APPLICATION(user_data);
	MainWindow *window = SAMEBOY_MAIN_WINDOW(gtk_application_get_active_window(GTK_APPLICATION(app)));
}

static const GActionEntry file_entries[] = {
	{ "open", activate_open, NULL, NULL, NULL },
	{ "close", activate_close, NULL, NULL, NULL },
};

static const GActionEntry emulation_entries[] = {
	{ "reset", activate_reset, NULL, NULL, NULL },
	{ "pause", NULL, NULL, "false", on_pause_changed },
	{ "save_state", NULL, NULL, NULL, NULL },
	{ "load_state", NULL, NULL, NULL, NULL },
};

static const GActionEntry developer_entries[] = {
	{ "show_console", activate_show_console, NULL, NULL, NULL },
	{ "open_memory_viewer", activate_open_memory_viewer, NULL, NULL, NULL },
	{ "open_vram_viewer", activate_open_vram_viewer, NULL, NULL, NULL },
	{ "break_debugger", activate_break_debugger, NULL, NULL, NULL },
	{ "toggle_developer_mode", NULL, NULL, "false", on_developer_mode_changed },
	{ "clear_console", activate_clear_console, NULL, NULL, NULL },
	{ "open_gtk_debugger", activate_open_gtk_debugger, NULL, NULL, NULL },
};

static  GActionEntry app_entries[] = {
	{ "quit", activate_quit, NULL, NULL, NULL },
	{ "about", activate_about, NULL, NULL, NULL },
	{ "preferences", activate_preferences, NULL, NULL, NULL },
	{ "toggle_mute", NULL, NULL, "false", on_mute_changed },
};

// WHY DO WE NEED SUCH AN UGLY METHOD, GTK?!
static void action_entries_set_enabled(SameBoyApplication *app, const GActionEntry *entries, unsigned n_entries, bool value) {
	// Assumes null-terminated if n_entries == -1
	for (unsigned i = 0; n_entries == -1 ? entries[i].name != NULL : i < n_entries; i++) {
		const GActionEntry *entry = &entries[i];
		if (entry->name == NULL) continue;

		action_set_enabled(app, entry->name, value);
	}
}

static void create_action_groups(SameBoyApplication *app) {
	g_action_map_add_action_entries(G_ACTION_MAP(app), emulation_entries, G_N_ELEMENTS(emulation_entries), app);
	g_action_map_add_action_entries(G_ACTION_MAP(app), developer_entries, G_N_ELEMENTS(developer_entries), app);
	g_action_map_add_action_entries(G_ACTION_MAP(app), app_entries,       G_N_ELEMENTS(app_entries),       app);
	g_action_map_add_action_entries(G_ACTION_MAP(app), file_entries,      G_N_ELEMENTS(file_entries),      app);

	action_set_enabled(app, "close", false);
	action_entries_set_enabled(app, emulation_entries, G_N_ELEMENTS(emulation_entries), false);
}

static void sameboy_application_startup(GApplication *gapp) {
	G_APPLICATION_CLASS(sameboy_application_parent_class)->startup(gapp);

	// TODO:
	// signal(SIGINT, quit_interrupt);

	g_debug("GTK version %u.%u.%u", gtk_get_major_version(), gtk_get_minor_version(), gtk_get_micro_version());

	SameBoyApplication *app = SAMEBOY_APPLICATION(gapp);
	g_debug("sameboy_application_startup");

	app->preferences = preferences_window_new();
	app->about_dialog = about_dialog_new();

	gtk_application_add_window(GTK_APPLICATION(gapp), GTK_WINDOW(app->preferences));

	create_action_groups(app);

	#if NDEBUG
		// Disable when not compiled in debug mode
		action_set_enabled(app, "open_gtk_debugger", false);
	#endif

	GdkScreen *screen = gdk_screen_get_default();
	GtkCssProvider *provider = gtk_css_provider_new();
	gtk_css_provider_load_from_resource(provider, RESOURCE_PREFIX "css/main.css");
	gtk_style_context_add_provider_for_screen(screen, GTK_STYLE_PROVIDER(provider), GTK_STYLE_PROVIDER_PRIORITY_APPLICATION);
}

static void open_file(SameBoyApplication *app, GFile *file) {
	g_debug("config_path:   %s", app->cli_options.config_path);
	g_debug("boot_rom_path: %s", app->cli_options.boot_rom_path);
	g_debug("fullscreen:    %d", app->cli_options.fullscreen);
	g_debug("model:         %d", app->cli_options.model);
	g_debug("force_software_renderer: %d", app->cli_options.force_software_renderer);

	if (file != NULL) {
		gchar *path = g_file_get_path(file);
		g_debug("File path: %s", path);
		g_free(path);
	}

	MainWindow *window = main_window_new(SAMEBOY_APPLICATION(app), false /* force_software_renderer */);

	// Define a set of window icons
	GList *icon_list = NULL;
	static char* icons[] = {
		RESOURCE_PREFIX "logo_256.png",
		RESOURCE_PREFIX "logo_128.png",
		RESOURCE_PREFIX "logo_64.png",
		RESOURCE_PREFIX "logo_48.png",
		RESOURCE_PREFIX "logo_32.png",
		RESOURCE_PREFIX "logo_16.png"
	};

	GdkPixbuf *icon = gdk_pixbuf_new_from_resource(icons[5], NULL);
	if (icon) {
		gtk_window_set_icon(GTK_WINDOW(window), icon);
		gtk_window_set_default_icon(icon);
	}

	// Create list of GdkPixbufs
	for (int i = 0; i < (sizeof(icons) / sizeof(const char*)); ++i) {
		GdkPixbuf *icon = gdk_pixbuf_new_from_resource(icons[i], NULL);
		if (!icon) continue;

		icon_list = g_list_prepend(icon_list, icon);
	}

	// Let GTK choose the proper icon
	gtk_window_set_icon_list(GTK_WINDOW(window), icon_list);
	gtk_window_set_default_icon_list(icon_list);

	gtk_about_dialog_set_logo(GTK_ABOUT_DIALOG(app->about_dialog), gdk_pixbuf_new_from_resource(icons[2], NULL)); // reuse the 64x64 icon
	gtk_about_dialog_set_version(GTK_ABOUT_DIALOG(app->about_dialog), "v" xstr(VERSION));
	g_list_free_full(icon_list, g_object_unref);

	if (app->cli_options.fullscreen) {
		main_window_fullscreen(window, true);
	}

	gtk_window_present(GTK_WINDOW(window));
}

static void sameboy_application_activate(GApplication *gapp) {
	SameBoyApplication *app = SAMEBOY_APPLICATION(gapp);
	g_debug("sameboy_application_activate");

	open_file(app, NULL);

	G_APPLICATION_CLASS(sameboy_application_parent_class)->activate(gapp);
}

static void sameboy_application_open(GApplication *gapp, GFile **files, int n_files, const char *hint) {
	SameBoyApplication *app = SAMEBOY_APPLICATION(gapp);
	g_debug("sameboy_application_open(hint = \"%s\")", hint);

	if (n_files >= 1) {
		if (n_files > 1) {
			g_warning("More than one file specified");
		}

		open_file(app, files[0]);
	}

	G_APPLICATION_CLASS(sameboy_application_parent_class)->open(gapp, files, n_files, hint);
}

static void sameboy_application_shutdown(GApplication *gapp) {
	SameBoyApplication *app = SAMEBOY_APPLICATION(gapp);
	g_debug("sameboy_application_shutdown");

	G_APPLICATION_CLASS(sameboy_application_parent_class)->shutdown(gapp);
}

static void sameboy_application_class_init(SameBoyApplicationClass *class) {
	G_APPLICATION_CLASS(class)->handle_local_options = sameboy_application_handle_local_options;
	G_APPLICATION_CLASS(class)->startup  = sameboy_application_startup;
	G_APPLICATION_CLASS(class)->activate = sameboy_application_activate;
	G_APPLICATION_CLASS(class)->open     = sameboy_application_open;
	G_APPLICATION_CLASS(class)->shutdown = sameboy_application_shutdown;
}

SameBoyApplication *sameboy_application_new(void) {
	return g_object_new(
		SAMEBOY_APPLICATION_TYPE,
		"application-id", APP_ID,
		// "flags", G_APPLICATION_NON_UNIQUE | G_APPLICATION_HANDLES_OPEN,
		"flags", G_APPLICATION_HANDLES_OPEN,
		NULL
	);
}

void sameboy_application_preferences_signal_connect(SameBoyApplication *app, const gchar *detailed_signal, GCallback c_handler, gpointer data) {
	g_signal_connect(app->preferences, detailed_signal, c_handler, data);
}