// Self
#include "pulse.h"

// C
#include <err.h>
#include <math.h>
#include <stdio.h>
#include <stdlib.h>

// C++
#include <string>
#include <algorithm>

// External
#include <pulse/pulseaudio.h>

namespace {
static void connect_state_cb(pa_context* context, void* raw) {
  enum pa_context_state *state = (enum pa_context_state*)raw;
  *state = pa_context_get_state(context);
}

static void success_cb(pa_context* context, int success, void* raw) {
  int *r = (int*)raw;
  *r = success;
  if (!success) {
    fprintf(stderr,
            "operation failed: %s\n",
            pa_strerror(pa_context_errno(context)));
  }
}

static void card_info_cb(pa_context* context,
                         const pa_card_info* info,
                         int eol,
                         void* raw) {
  if (eol < 0) {
    fprintf(stderr, "%s error in %s: \n", __func__,
        pa_strerror(pa_context_errno(context)));
    return;
  }

  if (!eol) {
    vector<Card>* cards = (vector<Card>*)raw;
    cards->push_back(info);
  }
}

template<typename T>
static void device_info_cb(pa_context* context,
                           const T* info,
                           int eol,
                           void* raw) {
  if (eol < 0) {
    fprintf(stderr, "%s error in %s: \n", __func__,
        pa_strerror(pa_context_errno(context)));
    return;
  }

  if (!eol) {
    vector<Device>* devices_ = (vector<Device>*)raw;
    devices_->push_back(info);
  }
}

static void server_info_cb(pa_context* context __attribute__((unused)),
                           const pa_server_info* i,
                           void* raw) {
  ServerInfo* defaults = (ServerInfo*)raw;
  defaults->sink = i->default_sink_name;
  defaults->source = i->default_source_name;
}

static pa_cvolume* value_to_cvol(long value, pa_cvolume *cvol) {
  return pa_cvolume_set(cvol, cvol->channels,
      fmax((double)(value + .5) * PA_VOLUME_NORM / 100, 0));
}

static int volume_as_percent(const pa_cvolume* cvol) {
  return pa_cvolume_avg(cvol) * 100.0 / PA_VOLUME_NORM;
}

static int xstrtol(const char *str, long *out) {
  char *end = NULL;

  if (str == NULL || *str == '\0') return -1;
  errno = 0;

  *out = strtol(str, &end, 10);
  if (errno || str == end || (end && *end)) return -1;

  return 0;
}


}  // anonymous namespace

PulseClient::PulseClient(string client_name) :
    client_name_(client_name),
    volume_range_(0, 150),
    balance_range_(-100, 100) {
  enum pa_context_state state = PA_CONTEXT_CONNECTING;

  pa_proplist* proplist = pa_proplist_new();
  pa_proplist_sets(proplist, PA_PROP_APPLICATION_NAME, client_name.c_str());
  pa_proplist_sets(proplist, PA_PROP_APPLICATION_ID, "com.falconindy.ponymix");
  pa_proplist_sets(proplist, PA_PROP_APPLICATION_VERSION, "0.1");
  pa_proplist_sets(proplist, PA_PROP_APPLICATION_ICON_NAME, "audio-card");

  mainloop_ = pa_mainloop_new();
  context_ = pa_context_new_with_proplist(pa_mainloop_get_api(mainloop_),
                                          nullptr, proplist);

  pa_proplist_free(proplist);

  pa_context_set_state_callback(context_, connect_state_cb, &state);
  pa_context_connect(context_, nullptr, PA_CONTEXT_NOFAIL, nullptr);
  while (state != PA_CONTEXT_READY && state != PA_CONTEXT_FAILED) {
    pa_mainloop_iterate(mainloop_, 1, nullptr);
  }

  if (state != PA_CONTEXT_READY) {
    fprintf(stderr, "failed to connect to pulse daemon: %s\n",
        pa_strerror(pa_context_errno(context_)));
    exit(EXIT_FAILURE);
  }
}

//
// Pulse Client
//
PulseClient::~PulseClient() {
  pa_context_unref(context_);
  pa_mainloop_free(mainloop_);
}

void PulseClient::Populate() {
  populate_server_info();
  populate_sinks();
  populate_sources();
  populate_cards();
}

Card* PulseClient::GetCard(const uint32_t& index) {
  for (Card& card : cards_) {
    if (card.index_ == index) return &card;
  }
  return nullptr;
}

Card* PulseClient::GetCard(const string& name) {
  for (Card& card : cards_) {
    if (card.name_ == name) return &card;
  }
  return nullptr;
}

Device* PulseClient::get_device(vector<Device>& devices, const uint32_t& index) {
  for (Device& device : devices) {
    if (device.index_ == index) return &device;
  }
  return nullptr;
}

Device* PulseClient::get_device(vector<Device>& devices, const string& name) {
  long val;
  if (xstrtol(name.c_str(), &val) == 0) return get_device(devices, val);

  for (Device& device : devices) {
    if (device.name_ == name) return &device;
  }
  return nullptr;
}

Device* PulseClient::GetSink(const uint32_t& index) {
  return get_device(sinks_, index);
}

Device* PulseClient::GetSink(const string& name) {
  return get_device(sinks_, name);
}

Device* PulseClient::GetSource(const uint32_t& index) {
  return get_device(sources_, index);
}

Device* PulseClient::GetSource(const string& name) {
  return get_device(sources_, name);
}

Device* PulseClient::GetSinkInput(const uint32_t& index) {
  return get_device(sink_inputs_, index);
}

Device* PulseClient::GetSinkInput(const string& name) {
  return get_device(sink_inputs_, name);
}

Device* PulseClient::GetSourceOutput(const uint32_t& index) {
  return get_device(source_outputs_, index);
}

Device* PulseClient::GetSourceOutput(const string& name) {
  return get_device(source_outputs_, name);
}

void PulseClient::mainloop_iterate(pa_operation* op) {
  int r;
  while (pa_operation_get_state(op) == PA_OPERATION_RUNNING) {
    pa_mainloop_iterate(mainloop_, 1, &r);
  }
}

void PulseClient::populate_cards() {
  cards_.clear();
  pa_operation* op = pa_context_get_card_info_list(context_,
                                                   card_info_cb,
                                                   (void*)&cards_);
  mainloop_iterate(op);
  pa_operation_unref(op);
}

void PulseClient::populate_server_info() {
  pa_operation* op = pa_context_get_server_info(context_,
                                                server_info_cb,
                                                &defaults_);
  mainloop_iterate(op);
  pa_operation_unref(op);
}

void PulseClient::populate_sinks() {
  sinks_.clear();
  pa_operation* op = pa_context_get_sink_info_list(context_,
                                                   device_info_cb,
                                                   (void*)&sinks_);
  mainloop_iterate(op);
  pa_operation_unref(op);

  sink_inputs_.clear();
  op = pa_context_get_sink_input_info_list(context_,
                                           device_info_cb,
                                           (void*)&sink_inputs_);
  mainloop_iterate(op);
  pa_operation_unref(op);
}

void PulseClient::populate_sources() {
  sources_.clear();
  pa_operation* op = pa_context_get_source_info_list(context_,
                                                     device_info_cb,
                                                     (void*)&sources_);
  mainloop_iterate(op);
  pa_operation_unref(op);

  source_outputs_.clear();
  op = pa_context_get_source_output_info_list(context_,
                                              device_info_cb,
                                              (void*)&source_outputs_);
  mainloop_iterate(op);
  pa_operation_unref(op);
}

bool PulseClient::SetMute(Device& device, bool mute) {
  int success;

  if (device.ops_.Mute == nullptr) {
    warnx("device does not support muting.");
    return false;
  }

  pa_operation* op = device.ops_.Mute(context_,
                                      device.index_,
                                      mute,
                                      success_cb,
                                      &success);
  mainloop_iterate(op);
  pa_operation_unref(op);

  if (success) device.mute_ = mute;

  return success;
}

bool PulseClient::SetVolume(Device& device, long volume) {
  int success;

  if (device.ops_.SetVolume == nullptr) {
    warnx("device does not support setting balance.");
    return false;
  }

  const pa_cvolume *cvol = value_to_cvol(volume, &device.volume_);
  pa_operation* op = device.ops_.SetVolume(context_,
                                           device.index_,
                                           cvol,
                                           success_cb,
                                           &success);
  mainloop_iterate(op);
  pa_operation_unref(op);

  if (success) device.update_volume(*cvol);

  return success;
}

bool PulseClient::IncreaseVolume(Device& device, long increment) {
  return SetVolume(device,
                   volume_range_.clamp(device.volume_percent_ + increment));
}

bool PulseClient::DecreaseVolume(Device& device, long increment) {
  return SetVolume(device,
                   volume_range_.clamp(device.volume_percent_ - increment));
}

bool PulseClient::SetBalance(Device& device, long balance) {
  int success;

  if (device.ops_.SetVolume == nullptr) {
    warnx("device does not support setting balance.");
    return false;
  }

  pa_cvolume *cvol = pa_cvolume_set_balance(&device.volume_,
                                            &device.channels_,
                                            balance / 100.0);
  pa_operation* op = device.ops_.SetVolume(context_,
                                           device.index_,
                                           cvol,
                                           success_cb,
                                           &success);
  mainloop_iterate(op);
  pa_operation_unref(op);

  if (success) device.update_volume(*cvol);

  return success;
}

bool PulseClient::IncreaseBalance(Device& device, long increment) {
  return SetBalance(device,
                    balance_range_.clamp(device.balance_ + increment));
}

bool PulseClient::DecreaseBalance(Device& device, long increment) {
  return SetBalance(device,
                    balance_range_.clamp(device.balance_ - increment));
}

int PulseClient::GetVolume(const Device& device) const {
  return device.Volume();
}

int PulseClient::GetBalance(const Device& device) const {
  return device.Balance();
}

bool PulseClient::SetProfile(Card& card, const string& profile) {
  int success;
  pa_operation* op =
    pa_context_set_card_profile_by_index(context_,
                                         card.index_,
                                         profile.c_str(),
                                         success_cb,
                                         &success);
  mainloop_iterate(op);
  pa_operation_unref(op);

  if (success) {
    // Update the profile
    for (const Profile p : card.profiles_) {
      if (p.name == profile) {
        card.active_profile_ = p;
        break;
      }
    }
  }

  return success;
}

bool PulseClient::Move(Device& source, Device& dest) {
  int success;

  if (source.ops_.Move == nullptr) {
    warnx("source device does not support moving.");
    return false;
  }

  pa_operation* op = source.ops_.Move(context_,
                                      source.index_,
                                      dest.index_,
                                      success_cb,
                                      &success);
  mainloop_iterate(op);
  pa_operation_unref(op);

  return success;
}

bool PulseClient::Kill(Device& device) {
  int success;

  if (device.ops_.Kill == nullptr) {
    warnx("source device does not support being killed.");
    return false;
  }

  pa_operation* op = device.ops_.Kill(context_,
                                      device.index_,
                                      success_cb,
                                      &success);
  mainloop_iterate(op);
  pa_operation_unref(op);

  if (success) remove_device(device);

  return success;
}

bool PulseClient::SetDefault(Device& device) {
  int success;

  if (device.ops_.SetDefault == nullptr) {
    warnx("device does not support defaults");
    return false;
  }

  pa_operation* op = device.ops_.SetDefault(context_,
                                            device.name_.c_str(),
                                            success_cb,
                                            &success);
  mainloop_iterate(op);
  pa_operation_unref(op);

  if (success) {
    switch (device.type_) {
    case DEVTYPE_SINK:
      defaults_.sink = device.name_;
      break;
    case DEVTYPE_SOURCE:
      defaults_.source = device.name_;
      break;
    default:
      errx(1, "impossible to set a default for device type %d",
           device.type_);
    }
  }

  return success;
}

void PulseClient::remove_device(Device& device) {
  vector<Device>* devlist;

  switch (device.type_) {
  case DEVTYPE_SINK:
    devlist = &sinks_;
  case DEVTYPE_SINK_INPUT:
    devlist = &sink_inputs_;
    break;
  case DEVTYPE_SOURCE:
    devlist = &sources_;
    break;
  case DEVTYPE_SOURCE_OUTPUT:
    devlist = &source_outputs_;
    break;
  }
  devlist->erase(
      std::remove_if(
        devlist->begin(), devlist->end(),
        [=](Device& d) { return d.index_ == device.index_; }),
      devlist->end());
}

//
// Cards
//
Card::Card(const pa_card_info* info) :
    index_(info->index),
    name_(info->name),
    owner_module_(info->owner_module),
    driver_(info->driver),
    active_profile_(*info->active_profile) {
  for (int i = 0; info->profiles[i].name != nullptr; i++) {
    profiles_.push_back(info->profiles[i]);
  }
}

//
// Devices
//
Device::Device(const pa_sink_info* info) :
    type_(DEVTYPE_SINK),
    index_(info->index),
    name_(info->name ? info->name : ""),
    desc_(info->description),
    mute_(info->mute) {
  update_volume(info->volume);
  memcpy(&channels_, &info->channel_map, sizeof(pa_channel_map));
  balance_ = pa_cvolume_get_balance(&volume_, &channels_) * 100.0;

  ops_.SetVolume = pa_context_set_sink_volume_by_index;
  ops_.Mute = pa_context_set_sink_mute_by_index;
  ops_.SetDefault = pa_context_set_default_sink;
}

Device::Device(const pa_source_info* info) :
    type_(DEVTYPE_SOURCE),
    index_(info->index),
    name_(info->name ? info->name : ""),
    desc_(info->description),
    mute_(info->mute) {
  update_volume(info->volume);
  memcpy(&channels_, &info->channel_map, sizeof(pa_channel_map));
  balance_ = pa_cvolume_get_balance(&volume_, &channels_) * 100.0;

  ops_.SetVolume = pa_context_set_source_volume_by_index;
  ops_.Mute = pa_context_set_source_mute_by_index;
  ops_.SetDefault = pa_context_set_default_source;
}

Device::Device(const pa_sink_input_info* info) :
    type_(DEVTYPE_SINK_INPUT),
    index_(info->index),
    name_(info->name ? info->name : ""),
    mute_(info->mute) {
  update_volume(info->volume);
  memcpy(&channels_, &info->channel_map, sizeof(pa_channel_map));
  balance_ = pa_cvolume_get_balance(&volume_, &channels_) * 100.0;

  const char *desc = pa_proplist_gets(info->proplist,
                                      PA_PROP_APPLICATION_NAME);
  if (desc) desc_ = desc;

  ops_.SetVolume = pa_context_set_sink_input_volume;
  ops_.Mute = pa_context_set_sink_input_mute;
  ops_.Kill = pa_context_kill_sink_input;
  ops_.Move = pa_context_move_sink_input_by_index;
}

Device::Device(const pa_source_output_info* info) :
    type_(DEVTYPE_SOURCE_OUTPUT),
    index_(info->index),
    name_(info->name ? info->name : ""),
    mute_(info->mute) {
  update_volume(info->volume);
  volume_percent_ = volume_as_percent(&volume_);
  balance_ = pa_cvolume_get_balance(&volume_, &channels_) * 100.0;

  const char *desc = pa_proplist_gets(info->proplist,
                                      PA_PROP_APPLICATION_NAME);
  if (desc) desc_ = desc;

  ops_.SetVolume = pa_context_set_source_output_volume;
  ops_.Mute = pa_context_set_source_output_mute;
  ops_.Kill = pa_context_kill_source_output;
  ops_.Move = pa_context_move_source_output_by_index;
}

void Device::update_volume(const pa_cvolume& newvol) {
  memcpy(&volume_, &newvol, sizeof(pa_cvolume));
  volume_percent_ = volume_as_percent(&volume_);
  balance_ = pa_cvolume_get_balance(&volume_, &channels_) * 100.0;
}

// vim: set et ts=2 sw=2: