ocarina/core/tags/album.c

/*
 * Copyright 2014 (c) Anna Schumaker.
 */
#include <core/idle.h>
#include <core/string.h>
#include <core/version.h>
#include <core/tags/album.h>
#include <musicbrainz5/mb5_c.h>

static struct database album_db;


static inline void __album_init_file(struct album *al, struct cache_file *f)
{
	cache_file_init(f, g_strdup_printf("%d",     al->al_year),
			   g_strdup_printf("%s.jpg", al->al_name));
}

static inline void __album_deinit_file(struct cache_file *f)
{
	g_free(f->cf_subdir);
	g_free(f->cf_name);
}

static Mb5Metadata __album_query_releaseid(struct album *album,
					   Mb5Query *mb5)
{
	gchar *param, *query = "query";
	Mb5Metadata  metadata = NULL;
	tQueryResult result;
	gchar error[256];

	if (album->al_artist != NULL)
		param = g_strdup_printf("release:\"%s\" AND artist:%s",
				album->al_lower, album->al_artist->ar_lower);
	else if (album->al_year != 0)
		param = g_strdup_printf("release:\"%s\" AND date:%d",
				album->al_lower, album->al_year);
	else
		param = g_strdup_printf("release:\"%s\"", album->al_lower);

	metadata = mb5_query_query(mb5, "release", "", "", 1, &query, &param);
	result   = mb5_query_get_lastresult(mb5);
	if (result != 0) {
		mb5_query_get_lasterrormessage(mb5, error, sizeof(error));
		g_printf("MusicBrainz: %s\n", error);
	}

	g_free(param);
	return metadata;
}

static bool __album_fetch_artwork(struct album *album)
{
	Mb5Metadata metadata;
	Mb5Query *mb5;
	bool ret;

	if (album_artwork_exists(album))
		return true;

	mb5 = mb5_query_new(OCARINA_NAME, NULL, 0);
	if (!mb5)
		return true;

	metadata = __album_query_releaseid(album, mb5);
	if (metadata)
		mb5_metadata_delete(metadata);

	ret = mb5_query_get_lasthttpcode(mb5) != 503;
	mb5_query_delete(mb5);
	return ret;
}

static gchar *__album_key(const gchar *name, unsigned int year)
{
	return g_strdup_printf("%u/%s", year, name);
}

static struct album *__album_alloc(gchar *name, unsigned int year)
{
	struct album *album = g_malloc(sizeof(struct album));

	dbe_init(&album->al_dbe, album);
	album->al_year   = year;
	album->al_name   = name;
	album->al_lower  = string_lowercase(album->al_name);
	album->al_artist = NULL;

	if (!album_artwork_exists(album))
		idle_schedule(IDLE_ASYNC, IDLE_FUNC(__album_fetch_artwork), album);
	return album;
}


static struct db_entry *album_alloc(const gchar *key)
{
	unsigned int year;
	gchar *name;

	if (sscanf(key, "%u/%m[^\n]", &year, &name) == 1)
		name = g_strdup("");
	return &__album_alloc(name, year)->al_dbe;
}

static void album_free(struct db_entry *dbe)
{
	g_free(ALBUM(dbe)->al_name);
	g_free(ALBUM(dbe)->al_lower);
	g_free(ALBUM(dbe));
}

static gchar *album_key(struct db_entry *dbe)
{
	return __album_key(ALBUM(dbe)->al_name, ALBUM(dbe)->al_year);
}

static struct db_entry *album_read(struct file *file)
{
	unsigned int year;
	gchar *line, *name;

	line = file_readl(file);
	if (sscanf(line, "%u %m[^\n]", &year, &name) == 1)
		name = g_strdup("");

	g_free(line);
	return &__album_alloc(name, year)->al_dbe;
}

static void album_write(struct file *file, struct db_entry *dbe)
{
	file_writef(file, "%u %s", ALBUM(dbe)->al_year, ALBUM(dbe)->al_name);
}


static const struct db_ops album_ops = {
	album_alloc,
	album_free,
	album_key,
	album_read,
	NULL,
	album_write,
};


void album_db_init()
{
	db_init(&album_db, "album.db", true, &album_ops);
	db_load_idle(&album_db);
}

void album_db_deinit()
{
	db_deinit(&album_db);
}

struct album *album_find(const gchar *name, unsigned int year)
{
	gchar *key = __album_key(name, year);
	struct album *album = ALBUM(db_find(&album_db, key));
	g_free(key);
	return album;
}

struct album *album_get(const unsigned int index)
{
	return ALBUM(db_at(&album_db, index));
}

int album_compare(struct album *lhs, struct album *rhs)
{
	return string_compare(lhs->al_lower, rhs->al_lower);
}

int album_compare_year(struct album *lhs, struct album *rhs)
{
	if (lhs->al_year - rhs->al_year == 0)
		return album_compare(lhs, rhs);
	return lhs->al_year - rhs->al_year;
}

bool album_artwork_exists(struct album *album)
{
	struct cache_file file;
	bool ret;

	__album_init_file(album, &file);
	ret = cache_file_exists(&file);
	__album_deinit_file(&file);

	return ret;
}

#ifdef CONFIG_TESTING
const struct db_ops *test_album_ops() { return &album_ops; }
#endif /* CONFIG_TESTING */