/*
    Media Library plugin for DeaDBeeF Player
    Copyright (C) 2009-2014 Alexey Yakovenko

    This software is provided 'as-is', without any express or implied
    warranty.  In no event will the authors be held liable for any damages
    arising from the use of this software.

    Permission is granted to anyone to use this software for any purpose,
    including commercial applications, and to alter it and redistribute it
    freely, subject to the following restrictions:

    1. The origin of this software must not be misrepresented; you must not
     claim that you wrote the original software. If you use this software
     in a product, an acknowledgment in the product documentation would be
     appreciated but is not required.

    2. Altered source versions must be plainly marked as such, and must not be
     misrepresented as being the original software.

    3. This notice may not be removed or altered from any source distribution.
*/

#include <sys/time.h>
#include <string.h>
#include "../../deadbeef.h"

DB_functions_t *deadbeef;

typedef struct ml_string_s {
    const char *text;
    struct ml_string_s *next;
} ml_string_t;

typedef struct ml_entry_s {
    const char *file;
    const char *title;
    int subtrack;
    ml_string_t *artist;
    ml_string_t *album;
    ml_string_t *genre;
    ml_string_t *folder;
    struct ml_entry_s *next;
} ml_entry_t;

typedef struct {
    ml_entry_t *tracks;

    // index tables
    ml_string_t *album;
    ml_string_t *artist;
    ml_string_t *genre;
    ml_string_t *folder;
} ml_db_t;

#define REG_COL(col)\
ml_string_t *\
ml_reg_##col (ml_db_t *db, const char *col) {\
    ml_string_t *s;\
    int release = 0;\
    if (!col) {\
        col = deadbeef->metacache_add_string ("Unknown");\
        release = 1;\
    }\
    for (s = db->col; s; s = s->next) {\
        if (s->text == col) {\
            if (release) {\
                deadbeef->metacache_unref (col);\
            }\
            return s;\
        }\
    }\
    if (!release) {\
        deadbeef->metacache_ref (col);\
    }\
    s = malloc (sizeof (ml_string_t));\
    memset (s, 0, sizeof (ml_string_t));\
    s->text = col;\
    s->next = db->col;\
    db->col = s;\
    return s;\
}

REG_COL(album);
REG_COL(artist);
REG_COL(genre);
REG_COL(folder);

DB_playItem_t *(*plt_insert_dir) (ddb_playlist_t *plt, DB_playItem_t *after, const char *dirname, int *pabort, int (*cb)(DB_playItem_t *it, void *data), void *user_data);

uintptr_t tid;
int scanner_terminate;

static int
add_file_info_cb (DB_playItem_t *it, void *data) {
//    fprintf (stderr, "added %s                                 \r", deadbeef->pl_find_meta (it, ":URI"));
    return 0;
}

static void
scanner_thread (void *none) {
    return;
    // create invisible playlist
    ddb_playlist_t *plt = deadbeef->plt_alloc ("scanner");

    struct timeval tm1;
    gettimeofday (&tm1, NULL);

    plt_insert_dir (plt, NULL, "/backup/mus/en", &scanner_terminate, add_file_info_cb, NULL);

    struct timeval tm2;
    gettimeofday (&tm2, NULL);
    int ms = (tm2.tv_sec*1000+tm2.tv_usec/1000) - (tm1.tv_sec*1000+tm1.tv_usec/1000);
    fprintf (stderr, "initial scan time: %f seconds (%d tracks)\n", ms / 1000.f, deadbeef->plt_get_item_count (plt, PL_MAIN));

    fprintf (stderr, "building index...\n");
    gettimeofday (&tm1, NULL);
    ml_db_t db;
    memset (&db, 0, sizeof (db));

    ml_entry_t *tail = NULL;

    DB_playItem_t *it = deadbeef->plt_get_first (plt, PL_MAIN);
    while (it) {

        ml_entry_t *en = malloc (sizeof (ml_entry_t));
        memset (en, 0, sizeof (ml_entry_t));

        const char *uri = deadbeef->pl_find_meta (it, ":URI");
        const char *title = deadbeef->pl_find_meta (it, "title");
        const char *artist = deadbeef->pl_find_meta (it, "artist");
        const char *album = deadbeef->pl_find_meta (it, "album");
        const char *genre = deadbeef->pl_find_meta (it, "genre");

        ml_string_t *alb = ml_reg_album (&db, album);
        ml_string_t *art = ml_reg_artist (&db, artist);
        ml_string_t *gnr = ml_reg_genre (&db, genre);

        char *fn = strrchr (uri, '/');
        ml_string_t *fld = NULL;
        if (fn) {
            char folder[fn-uri+1];
            memcpy (folder, uri, fn-uri);
            folder[fn-uri] = 0;
            const char *s = deadbeef->metacache_add_string (folder);
            fld = ml_reg_folder (&db, s);
            deadbeef->metacache_unref (s); // there should be at least 1 ref left, so it's safe
        }

        deadbeef->metacache_ref (uri);
        en->file = uri;
        deadbeef->metacache_ref (title);
        if (deadbeef->pl_get_item_flags (it) & DDB_IS_SUBTRACK) {
            en->subtrack = deadbeef->pl_find_meta_int (it, ":TRACKNUM", -1);
        }
        else {
            en->subtrack = -1;
        }
        en->title = title;
        en->artist = art;
        en->album = alb;
        en->genre = gnr;
        en->folder = fld;

        if (tail) {
            tail->next = en;
            tail = en;
        }
        else {
            tail = db.tracks = en;
        }

        DB_playItem_t *next = deadbeef->pl_get_next (it, PL_MAIN);
        deadbeef->pl_item_unref (it);
        it = next;
    }
    ms = (tm2.tv_sec*1000+tm2.tv_usec/1000) - (tm1.tv_sec*1000+tm1.tv_usec/1000);

    int nalb = 0;
    int nart = 0;
    int ngnr = 0;
    int nfld = 0;
    ml_string_t *s;
    for (s = db.album; s; s = s->next, nalb++);
    for (s = db.artist; s; s = s->next, nart++);
    for (s = db.genre; s; s = s->next, ngnr++);
    for (s = db.folder; s; s = s->next, nfld++);

    fprintf (stderr, "index build time: %f seconds (%d albums, %d artists, %d genres, %d folders)\n", ms / 1000.f, nalb, nart, ngnr, nfld);

    deadbeef->plt_free (plt);
}

static int
ml_connect (void) {
    tid = deadbeef->thread_start_low_priority (scanner_thread, NULL);
    return 0;
}

static int
ml_stop (void) {
    if (tid) {
        scanner_terminate = 1;
        deadbeef->thread_join (tid);
        tid = 0;
    }

    return 0;
}

static int
ml_message (uint32_t id, uintptr_t ctx, uint32_t p1, uint32_t p2) {
    return 0;
}

typedef struct {
    DB_misc_t plugin;
} ddb_medialib_plugin_t;

// define plugin interface
static ddb_medialib_plugin_t plugin = {
    .plugin.plugin.api_vmajor = 1,
    .plugin.plugin.api_vminor = 0,
    .plugin.plugin.version_major = 0,
    .plugin.plugin.version_minor = 1,
    .plugin.plugin.type = DB_PLUGIN_MISC,
    .plugin.plugin.id = "medialib",
    .plugin.plugin.name = "Media Library",
    .plugin.plugin.descr = "Scans disk for music files and manages them as database",
    .plugin.plugin.copyright = 
        "Media Library plugin for DeaDBeeF Player\n"
        "Copyright (C) 2009-2014 Alexey Yakovenko\n"
        "\n"
        "This software is provided 'as-is', without any express or implied\n"
        "warranty.  In no event will the authors be held liable for any damages\n"
        "arising from the use of this software.\n"
        "\n"
        "Permission is granted to anyone to use this software for any purpose,\n"
        "including commercial applications, and to alter it and redistribute it\n"
        "freely, subject to the following restrictions:\n"
        "\n"
        "1. The origin of this software must not be misrepresented; you must not\n"
        " claim that you wrote the original software. If you use this software\n"
        " in a product, an acknowledgment in the product documentation would be\n"
        " appreciated but is not required.\n"
        "\n"
        "2. Altered source versions must be plainly marked as such, and must not be\n"
        " misrepresented as being the original software.\n"
        "\n"
        "3. This notice may not be removed or altered from any source distribution.\n"
    ,
    .plugin.plugin.website = "http://deadbeef.sf.net",
    .plugin.plugin.connect = ml_connect,
    .plugin.plugin.stop = ml_stop,
//    .plugin.plugin.configdialog = settings_dlg,
    .plugin.plugin.message = ml_message,
};

DB_plugin_t *
medialib_load (DB_functions_t *api) {
    deadbeef = api;

    // hack: we need original function without overrides
    plt_insert_dir = deadbeef->plt_insert_dir;
    return DB_PLUGIN (&plugin);
}