/* vim: set sw=4 ts=4 sts=4 et: */

#ifdef HAVE_CONFIG_H
# include <config.h>
#endif

#include <stdio.h>
#include <string.h>
#include <sys/types.h>
#include <dirent.h>
#include <fnmatch.h>
#include <limits.h>

#include <Ecore.h>
#include <Ecore_File.h>

#include "Efreet.h"
#include "efreet_private.h"

typedef struct Efreet_Cache_Search      Efreet_Cache_Search;
typedef struct Efreet_Cache_Search_List Efreet_Cache_Search_List;

struct Efreet_Cache_Search
{
    Efreet_Desktop *result;
    const char *what1;
    const char *what2;
};

struct Efreet_Cache_Search_List
{
    Eina_List *list;
    const char *what;
};

/* define macros and variable for using the eina logging system  */

#ifdef EFREET_MODULE_LOG_DOM 
#undef EFREET_MODULE_LOG_DOM
#endif
#define EFREET_MODULE_LOG_DOM _efreet_utils_log_dom
static int _efreet_utils_log_dom = -1;

static char *efreet_util_path_in_default(const char *section, const char *path);

static int  efreet_util_glob_match(const char *str, const char *glob);

static void efreet_util_menus_find_helper(Eina_List *menus, const char *config_dir);

static Efreet_Desktop *efreet_util_cache_find(const char *search, const char *what1, const char *what2);
static Eina_List *efreet_util_cache_list(const char *search, const char *what);
static Eina_List *efreet_util_cache_glob_list(const char *search, const char *what);

static Eina_Hash *file_id_by_desktop_path = NULL;
static char *cache_file = NULL;
static Eet_File *cache = NULL;

static int init = 0;

EAPI int
efreet_util_init(void)
{
    if (init++) return init;
    _efreet_utils_log_dom = eina_log_domain_register("Efreet_util",EFREET_DEFAULT_LOG_COLOR);
    if (_efreet_utils_log_dom < 0)
    {
        ERROR("Efreet: Could not create a log domain for efreet_util");
        goto log_error;
    }

    /* TODO: Need file monitor on cache in case it is updated */
    cache = eet_open(efreet_util_cache_file(), EET_FILE_MODE_READ);
    if (!cache) goto cache_error;
    file_id_by_desktop_path = eina_hash_string_superfast_new(EINA_FREE_CB(eina_stringshare_del));

    return init;

cache_error:
    eina_log_domain_unregister(_efreet_utils_log_dom);
log_error:
    return 0;
}

EAPI int
efreet_util_shutdown(void)
{
    if (--init) return init;
    
    eina_log_domain_unregister(_efreet_utils_log_dom);
    IF_FREE_HASH(file_id_by_desktop_path);
    if (cache) eet_close(cache);
    IF_FREE(cache_file);
    return init;
}

/*
 * Needs EAPI because of helper binaries
 */
EAPI const char *
efreet_util_cache_file(void)
{
    char tmp[PATH_MAX] = { '\0' };
    const char *home, *lang, *country, *modifier;

    if (cache_file) return cache_file;

    home = efreet_home_dir_get();
    lang = efreet_lang_get();
    country = efreet_lang_country_get();
    modifier = efreet_lang_modifier_get();

    if (lang && country && modifier)
        snprintf(tmp, sizeof(tmp), "%s/.efreet/desktop_util_%s_%s@%s.cache", home, lang, country, modifier);
    else if (lang && country)
        snprintf(tmp, sizeof(tmp), "%s/.efreet/desktop_util_%s_%s.cache", home, lang, country);
    else if (lang)
        snprintf(tmp, sizeof(tmp), "%s/.efreet/desktop_util_%s.cache", home, lang);
    else
        snprintf(tmp, sizeof(tmp), "%s/.efreet/desktop_util.cache", home);

    cache_file = strdup(tmp);
    return cache_file;
}

static char *
efreet_util_path_in_default(const char *section, const char *path)
{
    Eina_List *dirs;
    char *ret = NULL;
    char *dir;

    dirs = efreet_default_dirs_get(efreet_data_home_get(), efreet_data_dirs_get(),
                                                                    section);

    EINA_LIST_FREE(dirs, dir)
    {
        if (!strncmp(path, dir, strlen(dir)))
            ret = dir;
        else
            free(dir);
    }

    return ret;
}

EAPI const char *
efreet_util_path_to_file_id(const char *path)
{
    size_t len;
    char *tmp, *p;
    char *base;
    const char *file_id;

    /* TODO: Check if searching in cache is fast enough */
    if (!path) return NULL;
    file_id = eina_hash_find(file_id_by_desktop_path, path);
    if (file_id) return file_id;

    base = efreet_util_path_in_default("applications", path);
    if (!base) return NULL;

    len = strlen(base);
    if (strlen(path) <= len)
    {
        free(base);
        return NULL;
    }
    if (strncmp(path, base, len))
    {
        free(base);
        return NULL;
    }

    tmp = strdup(path + len + 1);
    p = tmp;
    while (*p)
    {
        if (*p == '/') *p = '-';
        p++;
    }
    free(base);
    file_id = eina_stringshare_add(tmp);
    free(tmp);
    eina_hash_del(file_id_by_desktop_path, path, NULL);
    eina_hash_add(file_id_by_desktop_path, path, (void *)file_id);
    return file_id;
}

EAPI Eina_List *
efreet_util_desktop_mime_list(const char *mime)
{
    return efreet_util_cache_list("*::m", mime);
}

EAPI Efreet_Desktop *
efreet_util_desktop_wm_class_find(const char *wmname, const char *wmclass)
{
    return efreet_util_cache_find("*::swc", wmname, wmclass);
}

EAPI Efreet_Desktop *
efreet_util_desktop_file_id_find(const char *file_id)
{
    return efreet_util_cache_find("*::fi", file_id, NULL);
}

EAPI Efreet_Desktop *
efreet_util_desktop_exec_find(const char *exec)
{
    char **keys;
    int num, i;
    Efreet_Desktop *ret = NULL;

    if (!exec) return NULL;

    keys = eet_list(cache, "*::e", &num);
    if (!keys) return NULL;
    for (i = 0; i < num; i++)
    {
        const char *data, *file;
        char *exe;
        int size, id;
        char key[PATH_MAX];

        data = eet_read_direct(cache, keys[i], &size);
        if (!data) continue;
        exe = ecore_file_app_exe_get(data);
        if (!exe) continue;
        file = ecore_file_file_get(exe);
        if (!file) continue;
        if (strcmp(exec, exe) && strcmp(exec, file))
        {
            free(exe);
            continue;
        }
        free(exe);

        id = atoi(keys[i]);
        snprintf(key, sizeof(key), "%d::op", id);
        data = eet_read_direct(cache, key, &size);
        if (!data) continue;
        ret = efreet_desktop_get(data);
        if (ret) break;
    }
    free(keys);
    return ret;
}

EAPI Efreet_Desktop *
efreet_util_desktop_name_find(const char *name)
{
    return efreet_util_cache_find("*::n", name, NULL);
}

EAPI Efreet_Desktop *
efreet_util_desktop_generic_name_find(const char *generic_name)
{
    return efreet_util_cache_find("*::gn", generic_name, NULL);
}

EAPI Eina_List *
efreet_util_desktop_name_glob_list(const char *glob)
{
    return efreet_util_cache_glob_list("*::n", glob);
}

EAPI Eina_List *
efreet_util_desktop_exec_glob_list(const char *glob)
{
    char **keys;
    int num, i;
    Eina_List *ret = NULL;

    if (!glob) return NULL;

    keys = eet_list(cache, "*::e", &num);
    if (!keys) return NULL;
    for (i = 0; i < num; i++)
    {
        const char *data;
        char *exe;
        int size, id;
        char key[PATH_MAX];
        Efreet_Desktop *desk;

        data = eet_read_direct(cache, keys[i], &size);
        if (!data) continue;
        exe = ecore_file_app_exe_get(data);
        if (!exe) continue;
        if (!efreet_util_glob_match(exe, glob))
        {
            free(exe);
            continue;
        }
        free(exe);

        id = atoi(keys[i]);
        snprintf(key, sizeof(key), "%d::op", id);
        data = eet_read_direct(cache, key, &size);
        if (!data) continue;
        desk = efreet_desktop_get(data);
        if (desk)
            ret = eina_list_append(ret, desk);
    }
    free(keys);
    return ret;
}

EAPI Eina_List *
efreet_util_desktop_generic_name_glob_list(const char *glob)
{
    return efreet_util_cache_glob_list("*::gn", glob);
}

EAPI Eina_List *
efreet_util_desktop_comment_glob_list(const char *glob)
{
    return efreet_util_cache_glob_list("*::co", glob);
}

/**
 * Find all desktop categories
 * This list must be freed using EINA_LIST_FREE
 *
 * @return an Eina_List of category names (const char *)
 */
EAPI Eina_List *
efreet_util_desktop_categories_list(void)
{
    char **keys;
    int num, i;
    Eina_List *ret = NULL;

    keys = eet_list(cache, "*::ca", &num);
    if (!keys) return NULL;
    for (i = 0; i < num; i++)
    {
        const char *data;
        int size;

        data = eet_read_direct(cache, keys[i], &size);
        if (!data) continue;
        if (eina_list_search_unsorted(ret, EINA_COMPARE_CB(strcmp), data)) continue;
        ret = eina_list_append(ret, data);
    }
    free(keys);
    return ret;
}

/**
 * Find all desktops in a given category
 *
 * @param category the category name
 * @return a list of desktops
 */
EAPI Eina_List *
efreet_util_desktop_category_list(const char *category)
{
    return efreet_util_cache_list("*::ca", category);
}

static int
efreet_util_glob_match(const char *str, const char *glob)
{
    if (!str || !glob)
        return 0;
    if (glob[0] == '\0')
    {
        if (str[0] == '\0') return 1;
        return 0;
    }
    if (!strcmp(glob, "*")) return 1;
    if (!fnmatch(glob, str, 0)) return 1;
    return 0;
}

/**
 * Returns a list of .menu files found in the various config dirs.
 * @return An eina list of menu file paths (const char *). This must be freed with EINA_LIST_FREE.
 */
EAPI Eina_List *
efreet_util_menus_find(void)
{
    Eina_List *menus = NULL;
    Eina_List *dirs, *l;
    const char *dir;

    efreet_util_menus_find_helper(menus, efreet_config_home_get());

    dirs = efreet_config_dirs_get();
    EINA_LIST_FOREACH(dirs, l, dir)
        efreet_util_menus_find_helper(menus, dir);

    return menus;
}

static void
efreet_util_menus_find_helper(Eina_List *menus, const char *config_dir)
{
    DIR *files = NULL;
    struct dirent *file = NULL;
    char dbuf[PATH_MAX], fbuf[PATH_MAX];

    snprintf(dbuf, sizeof(dbuf), "%s/menus", config_dir);
    files = opendir(dbuf);
    if (!files) return;
    while ((file = readdir(files))) {
        const char *exten;
        exten = strrchr(file->d_name, '.');
        if (!exten) continue;
        if (strcmp(".menu", exten)) continue;

        snprintf(fbuf, sizeof(fbuf), "%s/%s", dbuf, file->d_name);
        if (ecore_file_is_dir(fbuf)) continue;

        menus = eina_list_append(menus, strdup(fbuf));
    }
    closedir(files);
}

static Efreet_Desktop *
efreet_util_cache_find(const char *search, const char *what1, const char *what2)
{
    char **keys;
    int num, i;
    Efreet_Desktop *ret = NULL;

    if ((!what1) && (!what2)) return NULL;

    keys = eet_list(cache, search, &num);
    if (!keys) return NULL;
    for (i = 0; i < num; i++)
    {
        const char *data;
        int size, id;
        char key[PATH_MAX];

        data = eet_read_direct(cache, keys[i], &size);
        if (!data) continue;
        if (!((what1 && !strcmp(what1, data)) ||
              (what2 && !strcmp(what2, data)))) continue;

        id = atoi(keys[i]);
        snprintf(key, sizeof(key), "%d::op", id);
        data = eet_read_direct(cache, key, &size);
        if (!data) continue;
        ret = efreet_desktop_get(data);
        if (ret) break;
    }
    free(keys);
    return ret;
}

static Eina_List *
efreet_util_cache_list(const char *search, const char *what)
{
    char **keys;
    int num, i;
    Eina_List *ret = NULL;

    if (!what) return NULL;

    keys = eet_list(cache, search, &num);
    if (!keys) return NULL;
    for (i = 0; i < num; i++)
    {
        const char *data;
        int size, id;
        char key[PATH_MAX];
        Efreet_Desktop *desk;

        data = eet_read_direct(cache, keys[i], &size);
        if (!data) continue;
        if (strcmp(what, data)) continue;

        id = atoi(keys[i]);
        snprintf(key, sizeof(key), "%d::op", id);
        data = eet_read_direct(cache, key, &size);
        if (!data) continue;
        desk = efreet_desktop_get(data);
        if (desk)
            ret = eina_list_append(ret, desk);
    }
    free(keys);
    return ret;
}

static Eina_List *
efreet_util_cache_glob_list(const char *search, const char *what)
{
    char **keys;
    int num, i;
    Eina_List *ret = NULL;

    if (!what) return NULL;

    keys = eet_list(cache, search, &num);
    if (!keys) return NULL;
    for (i = 0; i < num; i++)
    {
        const char *data;
        int size, id;
        char key[PATH_MAX];
        Efreet_Desktop *desk;

        data = eet_read_direct(cache, keys[i], &size);
        if (!data) continue;
        if (!efreet_util_glob_match(data, what)) continue;

        id = atoi(keys[i]);
        snprintf(key, sizeof(key), "%d::op", id);
        data = eet_read_direct(cache, key, &size);
        if (!data) continue;
        desk = efreet_desktop_get(data);
        if (desk)
            ret = eina_list_append(ret, desk);
    }
    free(keys);
    return ret;
}