/* ncmpc (Ncurses MPD Client)
 * (c) 2004-2009 The Music Player Daemon Project
 * Project homepage: http://musicpd.org
 
 * 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 2 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, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/

#include <sys/stat.h>
#include "i18n.h"
#include "options.h"
#include "mpdclient.h"
#include "command.h"
#include "screen.h"
#include "strfsong.h"
#include "lyrics.h"
#include "screen_text.h"

#include <stdlib.h>
#include <string.h>
#include <glib.h>
#include <unistd.h>
#include <stdio.h>

static struct screen_text text;

static const struct mpd_song *next_song;

static struct {
	struct mpd_song *song;

	char *artist, *title;

	struct plugin_cycle *loader;
} current;

static void
screen_lyrics_abort(void)
{
	if (current.loader != NULL) {
		plugin_stop(current.loader);
		current.loader = NULL;
	}

	if (current.artist != NULL) {
		g_free(current.artist);
		current.artist = NULL;
	}

	if (current.title != NULL) {
		g_free(current.title);
		current.artist = NULL;
	}

	if (current.song != NULL) {
		mpd_freeSong(current.song);
		current.song = NULL;
	}
}

/**
 * Repaint and update the screen, if it is currently active.
 */
static void
lyrics_repaint_if_active(void)
{
	if (screen_is_visible(&screen_lyrics)) {
		screen_text_repaint(&text);

		/* XXX repaint the screen title */
	}
}

static void
screen_lyrics_set(const GString *str)
{
	screen_text_set(&text, str);

	/* paint new data */

	lyrics_repaint_if_active();
}

static void
screen_lyrics_callback(const GString *result, G_GNUC_UNUSED void *data)
{
	assert(current.loader != NULL);

	if (result != NULL)
		screen_lyrics_set(result);
	else
		/* translators: no lyrics were found for the song */
		screen_status_message (_("No lyrics"));

	plugin_stop(current.loader);
	current.loader = NULL;
}

static void
screen_lyrics_load(const struct mpd_song *song)
{
	char buffer[MAX_SONGNAME_LENGTH];

	assert(song != NULL);

	screen_lyrics_abort();
	screen_text_clear(&text);

	current.song = mpd_songDup(song);

	strfsong(buffer, sizeof(buffer), "%artist%", song);
	current.artist = g_strdup(buffer);

	strfsong(buffer, sizeof(buffer), "%title%", song);
	current.title = g_strdup(buffer);

	current.loader = lyrics_load(current.artist, current.title,
				     screen_lyrics_callback, NULL);
}

static FILE *create_lyr_file(const char *artist, const char *title)
{
	char path[1024];

	snprintf(path, 1024, "%s/.lyrics",
		 getenv("HOME"));
	mkdir(path, S_IRWXU);

	snprintf(path, 1024, "%s/.lyrics/%s - %s.txt",
		 getenv("HOME"), artist, title);

	return fopen(path, "w");
}

static int store_lyr_hd(void)
{
	FILE *lyr_file;
	unsigned i;

	lyr_file = create_lyr_file(current.artist, current.title);
	if (lyr_file == NULL)
		return -1;

	for (i = 0; i < text.lines->len; ++i)
		fprintf(lyr_file, "%s\n",
			(const char*)g_ptr_array_index(text.lines, i));

	fclose(lyr_file);
	return 0;
}

static void
lyrics_screen_init(WINDOW *w, int cols, int rows)
{
	screen_text_init(&text, w, cols, rows);
}

static void
lyrics_resize(int cols, int rows)
{
	screen_text_resize(&text, cols, rows);
}

static void
lyrics_exit(void)
{
	screen_lyrics_abort();

	screen_text_deinit(&text);
}

static void
lyrics_open(mpdclient_t *c)
{
	if (next_song == NULL)
		next_song = c->song;

	if (next_song != NULL &&
	    (current.song == NULL ||
	     strcmp(next_song->file, current.song->file) != 0))
		screen_lyrics_load(next_song);

	next_song = NULL;
}


static const char *
lyrics_title(char *str, size_t size)
{
	if (current.loader != NULL) {
		snprintf(str, size, "%s (%s)",
			 _("Lyrics"),
			 /* translators: this message is displayed
			    while data is retrieved */
			 _("loading..."));
		return str;
	} else if (current.artist != NULL && current.title != NULL &&
		   !screen_text_is_empty(&text)) {
		snprintf(str, size, "%s: %s - %s",
			 _("Lyrics"),
			 current.artist, current.title);
		return str;
	} else
		return _("Lyrics");
}

static void
lyrics_paint(void)
{
	screen_text_paint(&text);
}

static bool
lyrics_cmd(mpdclient_t *c, command_t cmd)
{
	if (screen_text_cmd(&text, c, cmd))
		return true;

	switch(cmd) {
	case CMD_INTERRUPT:
		if (current.loader != NULL) {
			screen_lyrics_abort();
			screen_text_clear(&text);
		}
		return true;
	case CMD_ADD:
		if (current.loader == NULL && current.artist != NULL &&
		    current.title != NULL && store_lyr_hd() == 0)
			/* lyrics for the song were saved on hard disk */
			screen_status_message (_("Lyrics saved"));
		return true;
	case CMD_LYRICS_UPDATE:
		if (c->song != NULL) {
			screen_lyrics_load(c->song);
			screen_text_repaint(&text);
		}
		return true;

#ifdef ENABLE_SONG_SCREEN
	case CMD_VIEW:
		if (current.song != NULL) {
			screen_song_switch(c, current.song);
			return true;
		}

		break;
#endif

	case CMD_LOCATE:
		if (current.song != NULL) {
			screen_file_goto_song(c, current.song);
			return true;
		}

		return false;

	default:
		break;
	}

	return false;
}

const struct screen_functions screen_lyrics = {
	.init = lyrics_screen_init,
	.exit = lyrics_exit,
	.open = lyrics_open,
	.close = NULL,
	.resize = lyrics_resize,
	.paint = lyrics_paint,
	.cmd = lyrics_cmd,
	.get_title = lyrics_title,
};

void
screen_lyrics_switch(struct mpdclient *c, const struct mpd_song *song)
{
	assert(song != NULL);

	next_song = song;
	screen_switch(&screen_lyrics, c);
}