/*
    en50221 encoder An implementation for libdvb
    an implementation for the en50221 transport layer

    Copyright (C) 2004, 2005 Manu Abraham (manu@kromtek.com)
    Copyright (C) 2005 Julian Scheel (julian at jusst dot de)
    Copyright (C) 2006 Andrew de Quincey (adq_dvb@lidskialf.net)

    This library is free software; you can redistribute it and/or modify
    it under the terms of the GNU Lesser General Public License as
    published by the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public
    License along with this library; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
*/

#include <string.h>
#include <libdvbmisc/dvbmisc.h>
#include <pthread.h>
#include "en50221_app_dvb.h"
#include "en50221_app_tags.h"
#include "asn_1.h"

struct en50221_app_dvb_private {
        struct en50221_app_send_functions *funcs;

        en50221_app_dvb_tune_callback tune_callback;
        void *tune_callback_arg;

        en50221_app_dvb_replace_callback replace_callback;
        void *replace_callback_arg;

        en50221_app_dvb_clear_replace_callback clear_replace_callback;
        void *clear_replace_callback_arg;

        pthread_mutex_t lock;
};

static int en50221_app_dvb_parse_tune(struct en50221_app_dvb_private *private,
                                       uint8_t slot_id, uint16_t session_number,
                                       uint8_t *data, uint32_t data_length);

static int en50221_app_dvb_parse_replace(struct en50221_app_dvb_private *private,
                                          uint8_t slot_id, uint16_t session_number,
                                          uint8_t *data, uint32_t data_length);

static int en50221_app_dvb_parse_clear_replace(struct en50221_app_dvb_private *private,
                                                uint8_t slot_id, uint16_t session_number,
                                                uint8_t *data, uint32_t data_length);



en50221_app_dvb en50221_app_dvb_create(struct en50221_app_send_functions *funcs)
{
    struct en50221_app_dvb_private *private = NULL;

    // create structure and set it up
    private = malloc(sizeof(struct en50221_app_dvb_private));
    if (private == NULL) {
        return NULL;
    }
    private->funcs = funcs;
    private->tune_callback = NULL;
    private->replace_callback = NULL;
    private->clear_replace_callback = NULL;

    pthread_mutex_init(&private->lock, NULL);

    // done
    return private;
}

void en50221_app_dvb_destroy(en50221_app_dvb dvb)
{
    struct en50221_app_dvb_private *private = (struct en50221_app_dvb_private *) dvb;

    pthread_mutex_destroy(&private->lock);
    free(private);
}

void en50221_app_dvb_register_tune_callback(en50221_app_dvb dvb,
                                            en50221_app_dvb_tune_callback callback, void *arg)
{
    struct en50221_app_dvb_private *private = (struct en50221_app_dvb_private *) dvb;

    pthread_mutex_lock(&private->lock);
    private->tune_callback = callback;
    private->tune_callback_arg = arg;
    pthread_mutex_unlock(&private->lock);
}

void en50221_app_dvb_register_replace_callback(en50221_app_dvb dvb,
                                               en50221_app_dvb_replace_callback callback, void *arg)
{
    struct en50221_app_dvb_private *private = (struct en50221_app_dvb_private *) dvb;

    pthread_mutex_lock(&private->lock);
    private->replace_callback = callback;
    private->replace_callback_arg = arg;
    pthread_mutex_unlock(&private->lock);
}

void en50221_app_dvb_register_clear_replace_callback(en50221_app_dvb dvb,
                                                     en50221_app_dvb_clear_replace_callback callback, void *arg)
{
    struct en50221_app_dvb_private *private = (struct en50221_app_dvb_private *) dvb;

    pthread_mutex_lock(&private->lock);
    private->clear_replace_callback = callback;
    private->clear_replace_callback_arg = arg;
    pthread_mutex_unlock(&private->lock);
}

int en50221_app_dvb_ask_release(en50221_app_dvb dvb, uint16_t session_number)
{
    struct en50221_app_dvb_private *private = (struct en50221_app_dvb_private *) dvb;
    uint8_t data[4];

    data[0] = (TAG_ASK_RELEASE >> 16) & 0xFF;
    data[1] = (TAG_ASK_RELEASE >> 8) & 0xFF;
    data[2] = TAG_ASK_RELEASE & 0xFF;
    data[3] = 0;

    return private->funcs->send_data(private->funcs->arg, session_number, data, 4);
}

int en50221_app_dvb_message(en50221_app_dvb dvb,
                            uint8_t slot_id,
                            uint16_t session_number,
                            uint32_t resource_id,
                            uint8_t *data, uint32_t data_length)
{
    struct en50221_app_dvb_private *private = (struct en50221_app_dvb_private *) dvb;
    (void) resource_id;

    // get the tag
    if (data_length < 3) {
        print(LOG_LEVEL, ERROR, 1, "Received short data\n");
        return -1;
    }
    uint32_t tag = (data[0] << 16) | (data[1] << 8) | data[2];

    switch(tag)
    {
        case TAG_TUNE:
            return en50221_app_dvb_parse_tune(private, slot_id, session_number, data+3, data_length-3);
        case TAG_REPLACE:
            return en50221_app_dvb_parse_replace(private, slot_id, session_number, data+3, data_length-3);
        case TAG_CLEAR_REPLACE:
            return en50221_app_dvb_parse_clear_replace(private, slot_id, session_number, data+3, data_length-3);
    }

    print(LOG_LEVEL, ERROR, 1, "Received unexpected tag %x\n", tag);
    return -1;
}










static int en50221_app_dvb_parse_tune(struct en50221_app_dvb_private *private,
                                       uint8_t slot_id, uint16_t session_number,
                                       uint8_t *data, uint32_t data_length)
{
    // validate data
    if (data_length < 9) {
        print(LOG_LEVEL, ERROR, 1, "Received short data\n");
        return -1;
    }
    if (data[0] != 8) {
        print(LOG_LEVEL, ERROR, 1, "Received short data\n");
        return -1;
    }
    uint8_t *tune_data = data+1;

    // parse it
    uint16_t network_id = (tune_data[0] << 8) | tune_data[1];
    uint16_t original_network_id = (tune_data[2] << 8) | tune_data[3];
    uint16_t transport_stream_id = (tune_data[4] << 8) | tune_data[5];
    uint16_t service_id = (tune_data[6] << 8) | tune_data[7];

    // tell the app
    pthread_mutex_lock(&private->lock);
    en50221_app_dvb_tune_callback cb = private->tune_callback;
    void *cb_arg = private->tune_callback_arg;
    pthread_mutex_unlock(&private->lock);
    if (cb) {
        return cb(cb_arg, slot_id, session_number, network_id, original_network_id, transport_stream_id, service_id);
    }
    return 0;
}

static int en50221_app_dvb_parse_replace(struct en50221_app_dvb_private *private,
                                       uint8_t slot_id, uint16_t session_number,
                                       uint8_t *data, uint32_t data_length)
{
    // validate data
    if (data_length < 6) {
        print(LOG_LEVEL, ERROR, 1, "Received short data\n");
        return -1;
    }
    if (data[0] != 5) {
        print(LOG_LEVEL, ERROR, 1, "Received short data\n");
        return -1;
    }
    uint8_t *replace_data = data+1;

    // parse it
    uint8_t replacement_ref = replace_data[0];
    uint16_t replace_pid = ((replace_data[1] & 0x1f)<<8) | replace_data[2];
    uint16_t replacement_pid = ((replace_data[3] & 0x1f)<<8) | replace_data[4];

    // tell the app
    pthread_mutex_lock(&private->lock);
    en50221_app_dvb_replace_callback cb = private->replace_callback;
    void *cb_arg = private->replace_callback_arg;
    pthread_mutex_unlock(&private->lock);
    if (cb) {
        return cb(cb_arg, slot_id, session_number, replacement_ref, replace_pid, replacement_pid);
    }
    return 0;
}

static int en50221_app_dvb_parse_clear_replace(struct en50221_app_dvb_private *private,
                                                uint8_t slot_id, uint16_t session_number,
                                                uint8_t *data, uint32_t data_length)
{
    // validate data
    if (data_length < 2) {
        print(LOG_LEVEL, ERROR, 1, "Received short data\n");
        return -1;
    }
    if (data[0] != 1) {
        print(LOG_LEVEL, ERROR, 1, "Received short data\n");
        return -1;
    }
    uint8_t *replace_data = data+1;

    // parse it
    uint8_t replacement_ref = replace_data[0];

    // tell the app
    pthread_mutex_lock(&private->lock);
    en50221_app_dvb_clear_replace_callback cb = private->clear_replace_callback;
    void *cb_arg = private->clear_replace_callback_arg;
    pthread_mutex_unlock(&private->lock);
    if (cb) {
        return cb(cb_arg, slot_id, session_number, replacement_ref);
    }
    return 0;
}
