/*
 * param.c: SAT>IP plugin for the Video Disk Recorder
 *
 * See the README file for copyright information and how to reach the author.
 *
 */

#include <ctype.h>
#include <vdr/dvbdevice.h>
#include "common.h"
#include "param.h"

// --- cSatipParameterMaps ----------------------------------------------------

struct tSatipParameterMap {
  int         driverValue;
  const char *satipString;
};

static const tSatipParameterMap SatipBandwidthValues[] = {
  {  5000000, "&bw=5"     },
  {  6000000, "&bw=6"     },
  {  7000000, "&bw=7"     },
  {  8000000, "&bw=8"     },
  { 10000000, "&bw=10"    },
  {  1712000, "&bw=1.712" },
  {       -1, NULL       }
};

static const tSatipParameterMap SatipPilotValues[] = {
  {  PILOT_OFF, "&plts=off" },
  {   PILOT_ON, "&plts=on"  },
  { PILOT_AUTO, ""         },
  {         -1, NULL       }
};

static const tSatipParameterMap SatipSisoMisoValues[] = {
  {   0, "&sm=0" },
  {   1, "&sm=1" },
  {  -1, NULL   }
};

static const tSatipParameterMap SatipCodeRateValues[] = {
  { FEC_NONE, ""        },
  {  FEC_1_2, "&fec=12"  },
  {  FEC_2_3, "&fec=23"  },
  {  FEC_3_4, "&fec=34"  },
  {  FEC_3_5, "&fec=35"  },
  {  FEC_4_5, "&fec=45"  },
  {  FEC_5_6, "&fec=56"  },
  {  FEC_6_7, "&fec=67"  },
  {  FEC_7_8, "&fec=78"  },
  {  FEC_8_9, "&fec=89"  },
  { FEC_9_10, "&fec=910" },
  { FEC_AUTO, ""        },
  {       -1, NULL      }
};

static const tSatipParameterMap SatipModulationValues[] = {
  {     QPSK, "&mtype=qpsk"   },
  {    PSK_8, "&mtype=8psk"   },
  {   QAM_16, "&mtype=16qam"  },
  {   QAM_64, "&mtype=64qam"  },
  {  QAM_128, "&mtype=128qam" },
  {  QAM_256, "&mtype=256qam" },
  { QAM_AUTO, ""             },
  {       -1, NULL           }
};

static const tSatipParameterMap SatipSystemValuesSat[] = {
  {   0, "&msys=dvbs"  },
  {   1, "&msys=dvbs2" },
  {  -1, NULL         }
};

static const tSatipParameterMap SatipSystemValuesTerrestrial[] = {
  {   0, "&msys=dvbt"  },
  {   1, "&msys=dvbt2" },
  {  -1, NULL         }
};

static const tSatipParameterMap SatipSystemValuesCable[] = {
  {   0, "&msys=dvbc"  },
  {   1, "&msys=dvbc2" },
  {  -1, NULL         }
};

static const tSatipParameterMap SatipTransmissionValues[] = {
  {   TRANSMISSION_MODE_1K, "&tmode=1k"  },
  {   TRANSMISSION_MODE_2K, "&tmode=2k"  },
  {   TRANSMISSION_MODE_4K, "&tmode=4k"  },
  {   TRANSMISSION_MODE_8K, "&tmode=8k"  },
  {  TRANSMISSION_MODE_16K, "&tmode=16k" },
  {  TRANSMISSION_MODE_32K, "&tmode=32k" },
  { TRANSMISSION_MODE_AUTO, ""          },
  {                     -1, NULL        }
};

static const tSatipParameterMap SatipGuardValues[] = {
  {    GUARD_INTERVAL_1_4, "&gi=14"    },
  {    GUARD_INTERVAL_1_8, "&gi=18"    },
  {   GUARD_INTERVAL_1_16, "&gi=116"   },
  {   GUARD_INTERVAL_1_32, "&gi=132"   },
  {  GUARD_INTERVAL_1_128, "&gi=1128"  },
  { GUARD_INTERVAL_19_128, "&gi=19128" },
  { GUARD_INTERVAL_19_256, "&gi=19256" },
  {   GUARD_INTERVAL_AUTO, ""         },
  {                    -1, NULL       }
};

static const tSatipParameterMap SatipRollOffValues[] = {
  { ROLLOFF_AUTO, ""        },
  {   ROLLOFF_20, "&ro=0.20" },
  {   ROLLOFF_25, "&ro=0.25" },
  {   ROLLOFF_35, "&ro=0.35" },
  {           -1, NULL      }
};

static int SatipUserIndex(int valueP, const tSatipParameterMap *mapP)
{
  const tSatipParameterMap *map = mapP;
  while (map && map->driverValue != -1) {
        if (map->driverValue == valueP)
           return map - mapP;
        map++;
        }
  return -1;
}

static int PrintUrlString(char *bufP, int lenP, int valueP, const tSatipParameterMap *mapP)
{
  int n = SatipUserIndex(valueP, mapP);
  return ((n >= 0) && (lenP > 0)) ? snprintf(bufP, lenP, "%s", mapP[n].satipString) : 0;
}

cString GetTransponderUrlParameters(const cChannel *channelP)
{
  if (channelP) {
     char buffer[255];
     cDvbTransponderParameters dtp(channelP->Parameters());
#if defined(APIVERSNUM) && APIVERSNUM < 20106
     int Pilot = PILOT_AUTO;
     int T2SystemId = 0;
     int SisoMiso = 0;
#else
     int Pilot = dtp.Pilot();
     int T2SystemId = dtp.T2SystemId();
     int SisoMiso = dtp.SisoMiso();
#endif
     float freq = channelP->Frequency();
     char type = cSource::ToChar(channelP->Source());
     cSource *source = Sources.Get(channelP->Source());
     int src = (strchr("S", type) && source) ? atoi(source->Description()) : 1;
     char *q = buffer;
     *q = 0;
     // Scale down frequencies to MHz
     while (freq > 20000L)
           freq /= 1000L;
#define ST(s) if (strchr(s, type) && (strchr(s, '0' + dtp.System() + 1) || strchr(s, '*')))
#define STBUFLEFT (sizeof(buffer) - (q - buffer))
                q += snprintf(q,       STBUFLEFT, "freq=%s",          *dtoa(freq, "%lg"));
     ST(" S *") q += snprintf(q,       STBUFLEFT, "&src=%d",          ((src > 0) && (src <= 255)) ? src : 1);
     ST("CS *") q += snprintf(q,       STBUFLEFT, "&sr=%d",           channelP->Srate());
     ST(" S *") q += snprintf(q,       STBUFLEFT, "&pol=%c",          tolower(dtp.Polarization()));
     ST("C T2") q += snprintf(q,       STBUFLEFT, "&plp=%d",          dtp.StreamId());
     ST("  T2") q += snprintf(q,       STBUFLEFT, "&t2id=%d",         T2SystemId);
     ST("  T2") q += PrintUrlString(q, STBUFLEFT, SisoMiso,           SatipSisoMisoValues);
     ST("  T*") q += PrintUrlString(q, STBUFLEFT, dtp.Bandwidth(),    SatipBandwidthValues);
     ST("  T*") q += PrintUrlString(q, STBUFLEFT, dtp.Guard(),        SatipGuardValues);
     ST("CST*") q += PrintUrlString(q, STBUFLEFT, dtp.CoderateH(),    SatipCodeRateValues);
     ST(" S 2") q += PrintUrlString(q, STBUFLEFT, Pilot,              SatipPilotValues);
     ST(" S 2") q += PrintUrlString(q, STBUFLEFT, dtp.Modulation(),   SatipModulationValues);
     ST("C T*") q += PrintUrlString(q, STBUFLEFT, dtp.Modulation(),   SatipModulationValues);
     ST(" S 2") q += PrintUrlString(q, STBUFLEFT, dtp.RollOff(),      SatipRollOffValues);
     ST(" S *") q += PrintUrlString(q, STBUFLEFT, dtp.System(),       SatipSystemValuesSat);
     ST("C  *") q += PrintUrlString(q, STBUFLEFT, dtp.System(),       SatipSystemValuesCable);
     ST("  T*") q += PrintUrlString(q, STBUFLEFT, dtp.System(),       SatipSystemValuesTerrestrial);
     ST("  T*") q += PrintUrlString(q, STBUFLEFT, dtp.Transmission(), SatipTransmissionValues);
     if (channelP->Rid() > 0)
                q += snprintf(q,       STBUFLEFT, "&fe=%d",           channelP->Rid());
#undef ST
     return buffer;
     }
  return NULL;
}