/* -*- Mode: C; indent-tabs-mode: t; c-basic-offset: 8; tab-width: 8 -*- */
/*
 * Copyright (C) 2005 Novell, Inc.
 *
 * Caja 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.
 *
 * Caja 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; see the file COPYING.  If not,
 * write to the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
 * Boston, MA 02110-1301, USA.
 *
 * Author: Anders Carlsson <andersca@imendio.com>
 *
 */

#include <config.h>
#include "caja-search-engine-beagle.h"

#include <eel/eel-gtk-macros.h>
#include <gmodule.h>

typedef struct _BeagleHit BeagleHit;
typedef struct _BeagleQuery BeagleQuery;
typedef struct _BeagleClient BeagleClient;
typedef struct _BeagleRequest BeagleRequest;
typedef struct _BeagleFinishedResponse BeagleFinishedResponse;
typedef struct _BeagleHitsAddedResponse BeagleHitsAddedResponse;
typedef struct _BeagleQueryPartProperty BeagleQueryPartProperty;
typedef struct _BeagleQueryPart BeagleQueryPart;
typedef struct _BeagleHitsSubtractedResponse BeagleHitsSubtractedResponse;

struct CajaSearchEngineBeagleDetails
{
    BeagleClient *client;
    CajaQuery *query;

    BeagleQuery *current_query;
    char *current_query_uri_prefix;
    gboolean query_finished;
};

/* We dlopen() all the following from libbeagle at runtime */
#define BEAGLE_HIT(x) ((BeagleHit *)(x))
#define BEAGLE_REQUEST(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), beagle_request_get_type(), BeagleRequest))
#define BEAGLE_QUERY_PART(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), beagle_query_part_get_type(), BeagleQueryPart))

typedef enum
{
    BEAGLE_QUERY_PART_LOGIC_REQUIRED   = 1,
    BEAGLE_QUERY_PART_LOGIC_PROHIBITED = 2
} BeagleQueryPartLogic;

typedef enum
{
    BEAGLE_PROPERTY_TYPE_UNKNOWN = 0,
    BEAGLE_PROPERTY_TYPE_TEXT    = 1,
    BEAGLE_PROPERTY_TYPE_KEYWORD = 2,
    BEAGLE_PROPERTY_TYPE_DATE    = 3,
    BEAGLE_PROPERTY_TYPE_LAST    = 4
} BeaglePropertyType;

/* *static* wrapper function pointers */
static gboolean (*beagle_client_send_request_async) (BeagleClient  *client,
        BeagleRequest  *request,
        GError        **err) = NULL;
static const char* (*beagle_hit_get_uri)(BeagleHit* hit) = NULL;
static GSList *(*beagle_hits_added_response_get_hits) (BeagleHitsAddedResponse *response) = NULL;
static BeagleQuery *(*beagle_query_new) (void) = NULL;
static void (*beagle_query_add_text) (BeagleQuery     *query,
                                      const char      *str) = NULL;
static BeagleQueryPartProperty *(*beagle_query_part_property_new) (void) = NULL;
static void (*beagle_query_part_set_logic) (BeagleQueryPart      *part,
        BeagleQueryPartLogic  logic) = NULL;
static void (*beagle_query_part_property_set_key) (BeagleQueryPartProperty *part,
        const char              *key) = NULL;
static void (*beagle_query_part_property_set_value) (BeagleQueryPartProperty *part,
        const char *             value) = NULL;
static void (*beagle_query_part_property_set_property_type) (BeagleQueryPartProperty *part,
        BeaglePropertyType       prop_type) = NULL;
static void (*beagle_query_add_part) (BeagleQuery     *query,
                                      BeagleQueryPart *part) = NULL;
static GType (*beagle_request_get_type) (void) = NULL;
static GType (*beagle_query_part_get_type) (void) = NULL;
static gboolean (*beagle_util_daemon_is_running) (void) = NULL;
static BeagleClient *(*beagle_client_new_real) (const char *client_name) = NULL;
static void (*beagle_query_set_max_hits) (BeagleQuery *query,
        int max_hits) = NULL;
static GSList *(*beagle_hits_subtracted_response_get_uris) (BeagleHitsSubtractedResponse *response) = NULL;

static struct BeagleDlMapping
{
    const char *fn_name;
    gpointer *fn_ptr_ref;
} beagle_dl_mapping[] =
{
#define MAP(a) { #a, (gpointer *)&a }
    MAP (beagle_client_send_request_async),
    MAP (beagle_hit_get_uri),
    MAP (beagle_hits_added_response_get_hits),
    MAP (beagle_query_new),
    MAP (beagle_query_add_text),
    MAP (beagle_query_part_property_new),
    MAP (beagle_query_part_set_logic),
    MAP (beagle_query_part_property_set_key),
    MAP (beagle_query_part_property_set_value),
    MAP (beagle_query_part_property_set_property_type),
    MAP (beagle_query_add_part),
    MAP (beagle_request_get_type),
    MAP (beagle_query_part_get_type),
    MAP (beagle_util_daemon_is_running),
    MAP (beagle_query_set_max_hits),
    MAP (beagle_hits_subtracted_response_get_uris),
#undef MAP
    { "beagle_client_new", (gpointer *)&beagle_client_new_real },
};

static void
open_libbeagle (void)
{
    static gboolean done = FALSE;

    if (!done)
    {
        int i;
        GModule *beagle;

        done = TRUE;

        beagle = g_module_open ("libbeagle.so.1", G_MODULE_BIND_LAZY | G_MODULE_BIND_LOCAL);
        if (!beagle)
            return;

        for (i = 0; i < G_N_ELEMENTS (beagle_dl_mapping); i++)
        {
            if (!g_module_symbol (beagle, beagle_dl_mapping[i].fn_name,
                                  beagle_dl_mapping[i].fn_ptr_ref))
            {
                g_warning ("Missing symbol '%s' in libbeagle\n",
                           beagle_dl_mapping[i].fn_name);
                g_module_close (beagle);

                for (i = 0; i < G_N_ELEMENTS (beagle_dl_mapping); i++)
                    beagle_dl_mapping[i].fn_ptr_ref = NULL;

                return;
            }
        }
    }
}

static BeagleClient *
beagle_client_new (const char *client_name)
{
    if (beagle_client_new_real)
        return beagle_client_new_real (client_name);

    return NULL;
}

static void  caja_search_engine_beagle_class_init       (CajaSearchEngineBeagleClass *class);
static void  caja_search_engine_beagle_init             (CajaSearchEngineBeagle      *engine);

G_DEFINE_TYPE (CajaSearchEngineBeagle,
               caja_search_engine_beagle,
               CAJA_TYPE_SEARCH_ENGINE);

static CajaSearchEngineClass *parent_class = NULL;

static void
finalize (GObject *object)
{
    CajaSearchEngineBeagle *beagle;

    beagle = CAJA_SEARCH_ENGINE_BEAGLE (object);

    if (beagle->details->current_query)
    {
        g_object_unref (beagle->details->current_query);
        beagle->details->current_query = NULL;
        g_free (beagle->details->current_query_uri_prefix);
        beagle->details->current_query_uri_prefix = NULL;
    }

    if (beagle->details->query)
    {
        g_object_unref (beagle->details->query);
        beagle->details->query = NULL;
    }

    if (beagle->details->client)
    {
        g_object_unref (beagle->details->client);
        beagle->details->client = NULL;
    }

    g_free (beagle->details);

    EEL_CALL_PARENT (G_OBJECT_CLASS, finalize, (object));
}

static void
beagle_hits_added (BeagleQuery *query,
                   BeagleHitsAddedResponse *response,
                   CajaSearchEngineBeagle *engine)
{
    GSList *hits, *list;
    GList *hit_uris;
    const char *uri;

    hit_uris = NULL;

    hits = beagle_hits_added_response_get_hits (response);

    for (list = hits; list != NULL; list = list->next)
    {
        BeagleHit *hit = BEAGLE_HIT (list->data);

        uri = beagle_hit_get_uri (hit);

        if (engine->details->current_query_uri_prefix &&
                !g_str_has_prefix (uri, engine->details->current_query_uri_prefix))
        {
            continue;
        }

        hit_uris = g_list_prepend (hit_uris, (char *)uri);
    }

    caja_search_engine_hits_added (CAJA_SEARCH_ENGINE (engine), hit_uris);
    g_list_free (hit_uris);
}

static void
beagle_hits_subtracted (BeagleQuery *query,
                        BeagleHitsSubtractedResponse *response,
                        CajaSearchEngineBeagle *engine)
{
    GSList *uris, *list;
    GList *hit_uris;

    hit_uris = NULL;

    uris = beagle_hits_subtracted_response_get_uris (response);

    for (list = uris; list != NULL; list = list->next)
    {
        hit_uris = g_list_prepend (hit_uris, (char *)list->data);
    }

    caja_search_engine_hits_subtracted (CAJA_SEARCH_ENGINE (engine), hit_uris);
    g_list_free (hit_uris);
}

static void
beagle_finished (BeagleQuery *query,
                 BeagleFinishedResponse *response,
                 CajaSearchEngineBeagle *engine)
{
    /* For some reason we keep getting finished events,
     * only emit finished once */
    if (engine->details->query_finished)
    {
        return;
    }

    engine->details->query_finished = TRUE;
    caja_search_engine_finished (CAJA_SEARCH_ENGINE (engine));
}

static void
beagle_error (BeagleQuery *query,
              GError *error,
              CajaSearchEngineBeagle *engine)
{
    caja_search_engine_error (CAJA_SEARCH_ENGINE (engine), error->message);
}

static void
caja_search_engine_beagle_start (CajaSearchEngine *engine)
{
    CajaSearchEngineBeagle *beagle;
    GError *error;
    GList *mimetypes, *l;
    char *text, *mimetype;

    error = NULL;
    beagle = CAJA_SEARCH_ENGINE_BEAGLE (engine);

    if (beagle->details->current_query)
    {
        return;
    }

    beagle->details->query_finished = FALSE;
    beagle->details->current_query = beagle_query_new ();
    g_signal_connect (beagle->details->current_query,
                      "hits-added", G_CALLBACK (beagle_hits_added), engine);
    g_signal_connect (beagle->details->current_query,
                      "hits-subtracted", G_CALLBACK (beagle_hits_subtracted), engine);
    g_signal_connect (beagle->details->current_query,
                      "finished", G_CALLBACK (beagle_finished), engine);
    g_signal_connect (beagle->details->current_query,
                      "error", G_CALLBACK (beagle_error), engine);

    /* We only want files */
    beagle_query_add_text (beagle->details->current_query," type:File");

    beagle_query_set_max_hits (beagle->details->current_query,
                               1000);

    text = caja_query_get_text (beagle->details->query);
    beagle_query_add_text (beagle->details->current_query,
                           text);

    mimetypes = caja_query_get_mime_types (beagle->details->query);
    for (l = mimetypes; l != NULL; l = l->next)
    {
        char* temp;
        mimetype = l->data;
        temp = g_strconcat (" mimetype:", mimetype, NULL);
        beagle_query_add_text (beagle->details->current_query,temp);
        g_free (temp);
    }

    beagle->details->current_query_uri_prefix = caja_query_get_location (beagle->details->query);

    if (!beagle_client_send_request_async (beagle->details->client,
                                           BEAGLE_REQUEST (beagle->details->current_query), &error))
    {
        caja_search_engine_error (engine, error->message);
        g_error_free (error);
    }

    /* These must live during the lifetime of the query */
    g_free (text);
    g_list_free_full (mimetypes, g_free);
}

static void
caja_search_engine_beagle_stop (CajaSearchEngine *engine)
{
    CajaSearchEngineBeagle *beagle;

    beagle = CAJA_SEARCH_ENGINE_BEAGLE (engine);

    if (beagle->details->current_query)
    {
        g_object_unref (beagle->details->current_query);
        beagle->details->current_query = NULL;
        g_free (beagle->details->current_query_uri_prefix);
        beagle->details->current_query_uri_prefix = NULL;
    }
}

static gboolean
caja_search_engine_beagle_is_indexed (CajaSearchEngine *engine)
{
    return TRUE;
}

static void
caja_search_engine_beagle_set_query (CajaSearchEngine *engine, CajaQuery *query)
{
    CajaSearchEngineBeagle *beagle;

    beagle = CAJA_SEARCH_ENGINE_BEAGLE (engine);

    if (query)
    {
        g_object_ref (query);
    }

    if (beagle->details->query)
    {
        g_object_unref (beagle->details->query);
    }

    beagle->details->query = query;
}

static void
caja_search_engine_beagle_class_init (CajaSearchEngineBeagleClass *class)
{
    GObjectClass *gobject_class;
    CajaSearchEngineClass *engine_class;

    parent_class = g_type_class_peek_parent (class);

    gobject_class = G_OBJECT_CLASS (class);
    gobject_class->finalize = finalize;

    engine_class = CAJA_SEARCH_ENGINE_CLASS (class);
    engine_class->set_query = caja_search_engine_beagle_set_query;
    engine_class->start = caja_search_engine_beagle_start;
    engine_class->stop = caja_search_engine_beagle_stop;
    engine_class->is_indexed = caja_search_engine_beagle_is_indexed;
}

static void
caja_search_engine_beagle_init (CajaSearchEngineBeagle *engine)
{
    engine->details = g_new0 (CajaSearchEngineBeagleDetails, 1);
}


CajaSearchEngine *
caja_search_engine_beagle_new (void)
{
    CajaSearchEngineBeagle *engine;
    BeagleClient *client;

    open_libbeagle ();

    if (beagle_util_daemon_is_running == NULL ||
            !beagle_util_daemon_is_running ())
    {
        /* check whether daemon is running as beagle_client_new
         * doesn't fail when a stale socket file exists */
        return NULL;
    }

    client = beagle_client_new (NULL);

    if (client == NULL)
    {
        return NULL;
    }

    engine = g_object_new (CAJA_TYPE_SEARCH_ENGINE_BEAGLE, NULL);

    engine->details->client = client;

    return CAJA_SEARCH_ENGINE (engine);
}