/*
 *  tvheadend, channel functions
 *  Copyright (C) 2007 Andreas Öman
 *
 *  This program 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 3 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 General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include <pthread.h>
#include <assert.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <fcntl.h>
#include <ctype.h>
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <dirent.h>

#include <libhts/htscfg.h>

#include "tvhead.h"
#include "dvb.h"
#include "v4l.h"
#include "iptv_input.h"
#include "psi.h"
#include "channels.h"
#include "transports.h"

struct th_channel_list channels;
int nchannels;

struct th_channel_group_queue all_channel_groups;

th_channel_group_t *defgroup;


void scanner_init(void);

/**
 *
 */
static int
ch_number(const char *s1)
{
  while(*s1) {
    if(*s1 >= '0' && *s1 <= '9') {
      return strtol(s1, NULL, 10);
    }
    s1++;
  }
  return INT32_MAX;
}

static int
chcmp(const char *s1, const char *s2)
{
  int n1, n2;

  n1 = ch_number(s1);
  n2 = ch_number(s2);
  
  if(n1 != n2) {
    return n1 - n2;
  }
  return strcmp(s1, s2);
}

/**
 *
 */
static int
channelcmp(th_channel_t *a, th_channel_t *b)
{
  return chcmp(a->ch_name, b->ch_name);
}


/**
 *
 */
th_channel_group_t *
channel_group_find(const char *name, int create)
{
  th_channel_group_t *tcg;

  TAILQ_FOREACH(tcg, &all_channel_groups, tcg_global_link) {
    if(!strcmp(name, tcg->tcg_name))
      return tcg;
  }
  if(!create)
    return NULL;

  tcg = calloc(1, sizeof(th_channel_group_t));
  tcg->tcg_name = strdup(name);
  tcg->tcg_tag = tag_get();
  
  TAILQ_INIT(&tcg->tcg_channels);

  TAILQ_INSERT_TAIL(&all_channel_groups, tcg, tcg_global_link);

  channel_group_settings_write();
  return tcg;
}




/**
 *
 */
void
channel_set_group(th_channel_t *ch, th_channel_group_t *tcg)
{
  if(ch->ch_group != NULL)
    TAILQ_REMOVE(&ch->ch_group->tcg_channels, ch, ch_group_link);

  ch->ch_group = tcg;
  TAILQ_INSERT_SORTED(&tcg->tcg_channels, ch, ch_group_link, channelcmp);

  channel_settings_write(ch);
}


/**
 *
 */
void
channel_group_destroy(th_channel_group_t *tcg)
{
  th_channel_t *ch;

  if(defgroup == tcg)
    return;

  while((ch = TAILQ_FIRST(&tcg->tcg_channels)) != NULL) {
    channel_set_group(ch, defgroup);
  }

  TAILQ_REMOVE(&all_channel_groups, tcg, tcg_global_link);
  free((void *)tcg->tcg_name);
  free(tcg);

  channel_group_settings_write();
}

/**
 *
 */
static void
channel_set_name(th_channel_t *ch, const char *name)
{
  const char *n2;
  int l, i;
  char *cp, c;

  free((void *)ch->ch_name);
  free((void *)ch->ch_sname);

  ch->ch_name = strdup(name);

  l = strlen(name);
  ch->ch_sname = cp = malloc(l + 1);

  n2 = utf8toprintable(name);

  for(i = 0; i < strlen(n2); i++) {
    c = tolower(n2[i]);
    if(isalnum(c))
      *cp++ = c;
    else
      *cp++ = '-';
  }
  *cp = 0;

  free((void *)n2);

  LIST_INSERT_SORTED(&channels, ch, ch_global_link, channelcmp);
}

/**
 *
 */
th_channel_t *
channel_find(const char *name, int create, th_channel_group_t *tcg)
{
  th_channel_t *ch;

  LIST_FOREACH(ch, &channels, ch_global_link)
    if(!strcasecmp(name, ch->ch_name))
      return ch;

  if(create == 0)
    return NULL;

  ch = calloc(1, sizeof(th_channel_t));
  ch->ch_index = nchannels;
  TAILQ_INIT(&ch->ch_epg_events);

  channel_set_name(ch, name);

  channel_set_group(ch, tcg ?: defgroup);

  ch->ch_tag = tag_get();
  nchannels++;
  return ch;
}


/**
 *
 */
static void
service_load(struct config_head *head)
{
  const char *name,  *v;
  th_transport_t *t;
  int r = 1;

  if((name = config_get_str_sub(head, "channel", NULL)) == NULL)
    return;

  t = calloc(1, sizeof(th_transport_t));

  if(0) {
#ifdef ENABLE_INPUT_IPTV
  } else if((v = config_get_str_sub(head, "iptv", NULL)) != NULL) {
    r = iptv_configure_transport(t, v, head, name);
#endif
#ifdef ENABLE_INPUT_V4L
  } else if((v = config_get_str_sub(head, "v4lmux", NULL)) != NULL) {
    r = v4l_configure_transport(t, v, name);
#endif
  }
  if(r)
    free(t);
}


static struct strtab commercial_detect_tab[] = {
  { "none",       COMMERCIAL_DETECT_NONE   },
  { "ttp192",     COMMERCIAL_DETECT_TTP192 },
};


/**
 *
 */
void
channels_load(void)
{
  struct config_head cl;
  config_entry_t *ce;
  char buf[PATH_MAX];
  DIR *dir;
  struct dirent *d;
  const char *name, *grp, *x;
  th_channel_t *ch;
  th_channel_group_t *tcg;
  int v;

  TAILQ_INIT(&all_channel_groups);
  TAILQ_INIT(&cl);

  snprintf(buf, sizeof(buf), "%s/channel-group-settings.cfg", settings_dir);
  config_read_file0(buf, &cl);

  TAILQ_FOREACH(ce, &cl, ce_link) {
    if(ce->ce_type != CFG_SUB || strcasecmp("channel-group", ce->ce_key))
      continue;
     
    if((name = config_get_str_sub(&ce->ce_sub, "name", NULL)) == NULL)
      continue;

    channel_group_find(name, 1);
  }
  config_free0(&cl);

  tcg = channel_group_find("-disabled-", 1);
  tcg->tcg_cant_delete_me = 1;
  tcg->tcg_hidden = 1;
  
  defgroup = channel_group_find("Uncategorized", 1);
  defgroup->tcg_cant_delete_me = 1;

  snprintf(buf, sizeof(buf), "%s/channels", settings_dir);

  if((dir = opendir(buf)) == NULL)
    return;
  
  while((d = readdir(dir)) != NULL) {

    if(d->d_name[0] == '.')
      continue;

    snprintf(buf, sizeof(buf), "%s/channels/%s", settings_dir, d->d_name);
    TAILQ_INIT(&cl);
    config_read_file0(buf, &cl);

    name = config_get_str_sub(&cl, "name", NULL);
    grp = config_get_str_sub(&cl, "channel-group", NULL);
    if(name != NULL && grp != NULL) {
      tcg = channel_group_find(grp, 1);
      ch = channel_find(name, 1, tcg);
    
      x = config_get_str_sub(&cl, "commercial-detect", NULL);
      if(x != NULL) {
	v = str2val(x, commercial_detect_tab);
	if(v > 1)
	  ch->ch_commercial_detection = v;
      }

      if((x = config_get_str_sub(&cl, "icon", NULL)) != NULL)
	ch->ch_icon = strdup(x);
    }
    config_free0(&cl);
  }

  closedir(dir);

  
  /* Static services */

  TAILQ_FOREACH(ce, &config_list, ce_link) {
    if(ce->ce_type == CFG_SUB && !strcasecmp("service", ce->ce_key)) {
      service_load(&ce->ce_sub);
    }
  }
}



/**
 * The index stuff should go away
 */
th_channel_t *
channel_by_index(uint32_t index)
{
  th_channel_t *ch;

  LIST_FOREACH(ch, &channels, ch_global_link)
    if(ch->ch_index == index)
      return ch;

  return NULL;
}



/**
 *
 */
th_channel_t *
channel_by_tag(uint32_t tag)
{
  th_channel_t *ch;

  LIST_FOREACH(ch, &channels, ch_global_link)
    if(ch->ch_tag == tag)
      return ch;

  return NULL;
}



/**
 *
 */
th_channel_group_t *
channel_group_by_tag(uint32_t tag)
{
  th_channel_group_t *tcg;

  TAILQ_FOREACH(tcg, &all_channel_groups, tcg_global_link) {
    if(tcg->tcg_tag == tag)
      return tcg;
    if(tag == 0 && tcg->tcg_hidden == 0)
      return tcg;
  }

  return NULL;
}


/**
 * Write out a config file with all channel groups
 *
 * We do this to maintain order of groups
 */
void
channel_group_settings_write(void)
{
  FILE *fp;
  th_channel_group_t *tcg;

  char buf[400];
  snprintf(buf, sizeof(buf), "%s/channel-group-settings.cfg", settings_dir);

  if((fp = settings_open_for_write(buf)) == NULL)
    return;

  TAILQ_FOREACH(tcg, &all_channel_groups, tcg_global_link) {
    fprintf(fp, "channel-group {\n"
	    "\tname = %s\n", tcg->tcg_name);
    fprintf(fp, "}\n");
  }
  fclose(fp);
}



/**
 * Write out a config file for a channel
 */
void
channel_settings_write(th_channel_t *ch)
{
  FILE *fp;
  char buf[400];

  snprintf(buf, sizeof(buf), "%s/channels/%s", settings_dir, ch->ch_sname);
  if((fp = settings_open_for_write(buf)) == NULL)
    return;

  fprintf(fp, "name = %s\n", ch->ch_name);
  fprintf(fp, "channel-group = %s\n", ch->ch_group->tcg_name);
  if(ch->ch_icon != NULL)
    fprintf(fp, "icon = %s\n", ch->ch_icon);
  fprintf(fp, "commercial-detect = %s\n", 
	  val2str(ch->ch_commercial_detection, commercial_detect_tab) ?: "?");
  fclose(fp);
}

/**
 * Rename a channel and all tied transports
 */
int
channel_rename(th_channel_t *ch, const char *newname)
{
  th_transport_t *t;

  if(channel_find(newname, 0, NULL))
    return -1;

  LIST_REMOVE(ch, ch_global_link);
  channel_set_name(ch, newname);

  LIST_FOREACH(t, &ch->ch_transports, tht_channel_link) {
    free(t->tht_servicename);
    t->tht_servicename = strdup(newname);
    t->tht_config_change(t);
  }

  channel_settings_write(ch);
  return 0;
}

/**
 * Delete channel
 */
void
channel_delete(th_channel_t *ch)
{
  th_transport_t *t;

  while((t = LIST_FIRST(&ch->ch_transports)) != NULL)
    transport_unmap_channel(t);

  printf("Deleted channel %s\n", ch->ch_name);
}