/*
 * parsechannels.c - 
 * Copyright (C) 2008 Zaheer Abbas Merali
 * 
 * Authors:
 *   Zaheer Abbas Merali <zaheerabbas at merali dot org>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library 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
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library 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 <glib.h>
#include <glib-object.h>
#include <stdlib.h>
#include <string.h>
#include <gst/gst.h>

#include "parsechannels.h"

/* this will do zap style channels.conf only for the moment*/
GHashTable *
parse_channels_conf_from_file (const gchar * filename)
{
  gchar *contents;
  gchar **lines;
  gchar *line;
  gchar **fields;
  const gchar *terrestrial[] = { "inversion", "bandwidth",
    "code-rate-hp", "code-rate-lp", "modulation", "transmission-mode",
    "guard", "hierarchy"
  };
  const gchar *satellite[] = { "polarity", "diseqc-source",
    "symbol-rate"
  };
  const gchar *cable[] = { "inversion", "symbol-rate", "code-rate-hp",
    "modulation"
  };
  int i;
  GHashTable *res = NULL;

  if (g_file_get_contents (filename, &contents, NULL, NULL)) {
    lines = g_strsplit (contents, "\n", 0);
    res = g_hash_table_new (g_str_hash, g_str_equal);

    i = 0;
    line = lines[0];
    while (line != NULL) {
      if (line[0] != '#') {
        int numfields;
        gboolean parsed = FALSE;
        GHashTable *params = g_hash_table_new_full (g_str_hash, g_str_equal,
            g_free, g_free);

        fields = g_strsplit (line, ":", 0);
        numfields = g_strv_length (fields);
        if (numfields == 8) {
          /* satellite */
          int j;

          g_hash_table_insert (params, g_strdup ("type"),
              g_strdup ("satellite"));
          for (j = 2; j <= 4; j++) {
            g_hash_table_insert (params, g_strdup (satellite[j - 2]),
                g_strdup (fields[j]));
          }
          g_hash_table_insert (params, g_strdup ("frequency"),
              g_strdup_printf ("%d", atoi (fields[1]) * 1000));
          parsed = TRUE;
        } else if (numfields == 13) {
          /* terrestrial */
          int j;

          g_hash_table_insert (params, g_strdup ("type"),
              g_strdup ("terrestrial"));
          for (j = 2; j <= 9; j++) {
            g_hash_table_insert (params, g_strdup (terrestrial[j - 2]),
                g_strdup (fields[j]));
          }
          g_hash_table_insert (params, g_strdup ("frequency"),
              g_strdup (fields[1]));
          parsed = TRUE;
        } else if (numfields == 9) {
          /* cable */
          int j;

          g_hash_table_insert (params, g_strdup ("type"), g_strdup ("cable"));
          for (j = 2; j <= 5; j++) {
            g_hash_table_insert (params, g_strdup (cable[j - 2]),
                g_strdup (fields[j]));
          }
          g_hash_table_insert (params, g_strdup ("frequency"),
              g_strdup (fields[1]));
          parsed = TRUE;
        } else if (numfields == 6) {
          /* atsc (vsb/qam) */
          g_hash_table_insert (params, g_strdup ("type"), g_strdup ("atsc"));
          g_hash_table_insert (params, g_strdup ("modulation"),
              g_strdup (fields[2]));

          g_hash_table_insert (params, g_strdup ("frequency"),
              g_strdup (fields[1]));
          parsed = TRUE;
        }
        if (parsed) {
          g_hash_table_insert (params, g_strdup ("sid"),
              g_strdup (fields[numfields - 1]));
          g_hash_table_insert (res, g_strdup (fields[0]), params);
        }
        g_strfreev (fields);
      }
      line = lines[++i];
    }
    g_strfreev (lines);
    g_free (contents);
  }
  return res;
}

static gboolean
remove_channel_from_hash (gpointer key, gpointer value, gpointer user_data)
{
  if (key)
    g_free (key);
  if (value)
    g_hash_table_destroy ((GHashTable *) value);
  return TRUE;
}

static void
destroy_channels_hash (GHashTable * channels)
{
  g_hash_table_foreach_remove (channels, remove_channel_from_hash, NULL);
}

gboolean
set_properties_for_channel (GObject * dvbbasebin, const gchar * channel_name)
{
  gboolean ret = FALSE;
  GHashTable *channels;
  gchar *filename;

  filename = g_strdup (g_getenv ("GST_DVB_CHANNELS_CONF"));
  if (filename == NULL) {
    guint major, minor, micro, nano;

    gst_version (&major, &minor, &micro, &nano);
    filename = g_strdup_printf ("%s/gstreamer-%d.%d/dvb-channels.conf",
        g_get_user_config_dir (), major, minor);
  }
  channels = parse_channels_conf_from_file (filename);
  g_free (filename);

  if (channels) {
    GHashTable *params = g_hash_table_lookup (channels,
        channel_name);

    if (params) {
      gchar *type;
      const gchar *adapter;

      g_object_set (dvbbasebin, "program-numbers",
          g_hash_table_lookup (params, "sid"), NULL);
      /* check if it is terrestrial or satellite */
      adapter = g_getenv ("GST_DVB_ADAPTER");
      if (adapter)
        g_object_set (dvbbasebin, "adapter", atoi (adapter), NULL);
      g_object_set (dvbbasebin, "frequency",
          atoi (g_hash_table_lookup (params, "frequency")), NULL);
      type = g_hash_table_lookup (params, "type");
      if (strcmp (type, "terrestrial") == 0) {
        gchar *val;

        val = g_hash_table_lookup (params, "inversion");
        if (strcmp (val, "INVERSION_OFF") == 0)
          g_object_set (dvbbasebin, "inversion", 0, NULL);
        else if (strcmp (val, "INVERSION_ON") == 0)
          g_object_set (dvbbasebin, "inversion", 1, NULL);
        else
          g_object_set (dvbbasebin, "inversion", 2, NULL);

        val = g_hash_table_lookup (params, "bandwidth");
        if (strcmp (val, "BANDWIDTH_8_MHZ") == 0)
          g_object_set (dvbbasebin, "bandwidth", 0, NULL);
        else if (strcmp (val, "BANDWIDTH_7_MHZ") == 0)
          g_object_set (dvbbasebin, "bandwidth", 1, NULL);
        else if (strcmp (val, "BANDWIDTH_6_MHZ") == 0)
          g_object_set (dvbbasebin, "bandwidth", 2, NULL);
        else
          g_object_set (dvbbasebin, "bandwidth", 3, NULL);

        val = g_hash_table_lookup (params, "code-rate-hp");
        if (strcmp (val, "FEC_NONE") == 0)
          g_object_set (dvbbasebin, "code-rate-hp", 0, NULL);
        else if (strcmp (val, "FEC_1_2") == 0)
          g_object_set (dvbbasebin, "code-rate-hp", 1, NULL);
        else if (strcmp (val, "FEC_2_3") == 0)
          g_object_set (dvbbasebin, "code-rate-hp", 2, NULL);
        else if (strcmp (val, "FEC_3_4") == 0)
          g_object_set (dvbbasebin, "code-rate-hp", 3, NULL);
        else if (strcmp (val, "FEC_4_5") == 0)
          g_object_set (dvbbasebin, "code-rate-hp", 4, NULL);
        else if (strcmp (val, "FEC_5_6") == 0)
          g_object_set (dvbbasebin, "code-rate-hp", 5, NULL);
        else if (strcmp (val, "FEC_6_7") == 0)
          g_object_set (dvbbasebin, "code-rate-hp", 6, NULL);
        else if (strcmp (val, "FEC_7_8") == 0)
          g_object_set (dvbbasebin, "code-rate-hp", 7, NULL);
        else if (strcmp (val, "FEC_8_9") == 0)
          g_object_set (dvbbasebin, "code-rate-hp", 8, NULL);
        else
          g_object_set (dvbbasebin, "code-rate-hp", 9, NULL);

        val = g_hash_table_lookup (params, "code-rate-lp");
        if (strcmp (val, "FEC_NONE") == 0)
          g_object_set (dvbbasebin, "code-rate-lp", 0, NULL);
        else if (strcmp (val, "FEC_1_2") == 0)
          g_object_set (dvbbasebin, "code-rate-lp", 1, NULL);
        else if (strcmp (val, "FEC_2_3") == 0)
          g_object_set (dvbbasebin, "code-rate-lp", 2, NULL);
        else if (strcmp (val, "FEC_3_4") == 0)
          g_object_set (dvbbasebin, "code-rate-lp", 3, NULL);
        else if (strcmp (val, "FEC_4_5") == 0)
          g_object_set (dvbbasebin, "code-rate-lp", 4, NULL);
        else if (strcmp (val, "FEC_5_6") == 0)
          g_object_set (dvbbasebin, "code-rate-lp", 5, NULL);
        else if (strcmp (val, "FEC_6_7") == 0)
          g_object_set (dvbbasebin, "code-rate-lp", 6, NULL);
        else if (strcmp (val, "FEC_7_8") == 0)
          g_object_set (dvbbasebin, "code-rate-lp", 7, NULL);
        else if (strcmp (val, "FEC_8_9") == 0)
          g_object_set (dvbbasebin, "code-rate-lp", 8, NULL);
        else
          g_object_set (dvbbasebin, "code-rate-lp", 9, NULL);

        val = g_hash_table_lookup (params, "modulation");
        if (strcmp (val, "QPSK") == 0)
          g_object_set (dvbbasebin, "modulation", 0, NULL);
        else if (strcmp (val, "QAM_16") == 0)
          g_object_set (dvbbasebin, "modulation", 1, NULL);
        else if (strcmp (val, "QAM_32") == 0)
          g_object_set (dvbbasebin, "modulation", 2, NULL);
        else if (strcmp (val, "QAM_64") == 0)
          g_object_set (dvbbasebin, "modulation", 3, NULL);
        else if (strcmp (val, "QAM_128") == 0)
          g_object_set (dvbbasebin, "modulation", 4, NULL);
        else if (strcmp (val, "QAM_256") == 0)
          g_object_set (dvbbasebin, "modulation", 5, NULL);
        else
          g_object_set (dvbbasebin, "modulation", 6, NULL);

        val = g_hash_table_lookup (params, "transmission-mode");
        if (strcmp (val, "TRANSMISSION_MODE_2K") == 0)
          g_object_set (dvbbasebin, "trans-mode", 0, NULL);
        else if (strcmp (val, "TRANSMISSION_MODE_8K") == 0)
          g_object_set (dvbbasebin, "trans-mode", 1, NULL);
        else
          g_object_set (dvbbasebin, "trans-mode", 2, NULL);

        val = g_hash_table_lookup (params, "guard");
        if (strcmp (val, "GUARD_INTERVAL_1_32") == 0)
          g_object_set (dvbbasebin, "guard", 0, NULL);
        else if (strcmp (val, "GUARD_INTERVAL_1_16") == 0)
          g_object_set (dvbbasebin, "guard", 1, NULL);
        else if (strcmp (val, "GUARD_INTERVAL_1_8") == 0)
          g_object_set (dvbbasebin, "guard", 2, NULL);
        else if (strcmp (val, "GUARD_INTERVAL_1_4") == 0)
          g_object_set (dvbbasebin, "guard", 3, NULL);
        else
          g_object_set (dvbbasebin, "guard", 4, NULL);

        val = g_hash_table_lookup (params, "hierarchy");
        if (strcmp (val, "HIERARCHY_NONE") == 0)
          g_object_set (dvbbasebin, "hierarchy", 0, NULL);
        else if (strcmp (val, "HIERARCHY_1") == 0)
          g_object_set (dvbbasebin, "hierarchy", 1, NULL);
        else if (strcmp (val, "HIERARCHY_2") == 0)
          g_object_set (dvbbasebin, "hierarchy", 2, NULL);
        else if (strcmp (val, "HIERARCHY_4") == 0)
          g_object_set (dvbbasebin, "hierarchy", 3, NULL);
        else
          g_object_set (dvbbasebin, "hierarchy", 4, NULL);

        ret = TRUE;
      } else if (strcmp (type, "satellite") == 0) {
        gchar *val;

        ret = TRUE;

        val = g_hash_table_lookup (params, "polarity");
        if (val)
          g_object_set (dvbbasebin, "polarity", val, NULL);
        else
          ret = FALSE;

        val = g_hash_table_lookup (params, "diseqc-source");
        if (val)
          g_object_set (dvbbasebin, "diseqc-source", atoi (val), NULL);

        val = g_hash_table_lookup (params, "symbol-rate");
        if (val)
          g_object_set (dvbbasebin, "symbol-rate", atoi (val), NULL);
        else
          ret = FALSE;
      } else if (strcmp (type, "cable") == 0) {
        gchar *val;

        ret = TRUE;
        val = g_hash_table_lookup (params, "symbol-rate");
        if (val)
          g_object_set (dvbbasebin, "symbol-rate", atoi (val) / 1000, NULL);
        val = g_hash_table_lookup (params, "modulation");
        if (strcmp (val, "QPSK") == 0)
          g_object_set (dvbbasebin, "modulation", 0, NULL);
        else if (strcmp (val, "QAM_16") == 0)
          g_object_set (dvbbasebin, "modulation", 1, NULL);
        else if (strcmp (val, "QAM_32") == 0)
          g_object_set (dvbbasebin, "modulation", 2, NULL);
        else if (strcmp (val, "QAM_64") == 0)
          g_object_set (dvbbasebin, "modulation", 3, NULL);
        else if (strcmp (val, "QAM_128") == 0)
          g_object_set (dvbbasebin, "modulation", 4, NULL);
        else if (strcmp (val, "QAM_256") == 0)
          g_object_set (dvbbasebin, "modulation", 5, NULL);
        else
          g_object_set (dvbbasebin, "modulation", 6, NULL);
        val = g_hash_table_lookup (params, "code-rate-hp");
        if (strcmp (val, "FEC_NONE") == 0)
          g_object_set (dvbbasebin, "code-rate-hp", 0, NULL);
        else if (strcmp (val, "FEC_1_2") == 0)
          g_object_set (dvbbasebin, "code-rate-hp", 1, NULL);
        else if (strcmp (val, "FEC_2_3") == 0)
          g_object_set (dvbbasebin, "code-rate-hp", 2, NULL);
        else if (strcmp (val, "FEC_3_4") == 0)
          g_object_set (dvbbasebin, "code-rate-hp", 3, NULL);
        else if (strcmp (val, "FEC_4_5") == 0)
          g_object_set (dvbbasebin, "code-rate-hp", 4, NULL);
        else if (strcmp (val, "FEC_5_6") == 0)
          g_object_set (dvbbasebin, "code-rate-hp", 5, NULL);
        else if (strcmp (val, "FEC_6_7") == 0)
          g_object_set (dvbbasebin, "code-rate-hp", 6, NULL);
        else if (strcmp (val, "FEC_7_8") == 0)
          g_object_set (dvbbasebin, "code-rate-hp", 7, NULL);
        else if (strcmp (val, "FEC_8_9") == 0)
          g_object_set (dvbbasebin, "code-rate-hp", 8, NULL);
        else
          g_object_set (dvbbasebin, "code-rate-hp", 9, NULL);
        val = g_hash_table_lookup (params, "inversion");
        if (strcmp (val, "INVERSION_OFF") == 0)
          g_object_set (dvbbasebin, "inversion", 0, NULL);
        else if (strcmp (val, "INVERSION_ON") == 0)
          g_object_set (dvbbasebin, "inversion", 1, NULL);
        else
          g_object_set (dvbbasebin, "inversion", 2, NULL);
      } else if (strcmp (type, "atsc") == 0) {
        gchar *val;

        ret = TRUE;

        val = g_hash_table_lookup (params, "modulation");
        if (strcmp (val, "QAM_64") == 0)
          g_object_set (dvbbasebin, "modulation", 3, NULL);
        else if (strcmp (val, "QAM_256") == 0)
          g_object_set (dvbbasebin, "modulation", 5, NULL);
        else if (strcmp (val, "8VSB") == 0)
          g_object_set (dvbbasebin, "modulation", 7, NULL);
        else if (strcmp (val, "16VSB") == 0)
          g_object_set (dvbbasebin, "modulation", 8, NULL);
        else
          ret = FALSE;
      }
    }
    destroy_channels_hash (channels);
  }

  return ret;
}