struct Audio;

struct AudioDriver {
  AudioDriver(Audio& super) : super(super) {}
  virtual ~AudioDriver() = default;

  virtual auto create() -> bool { return true; }
  virtual auto driverName() -> string { return "None"; }
  virtual auto ready() -> bool { return true; }

  virtual auto hasExclusive() -> bool { return false; }
  virtual auto hasContext() -> bool { return false; }
  virtual auto hasDevices() -> vector<string> { return {"Default"}; }
  virtual auto hasBlocking() -> bool { return false; }
  virtual auto hasDynamic() -> bool { return false; }
  virtual auto hasChannels() -> vector<uint> { return {0}; }
  virtual auto hasFrequencies() -> vector<uint> { return {0}; }
  virtual auto hasLatencies() -> vector<uint> { return {0}; }

  auto hasDevice(string device) -> bool { return (bool)hasDevices().find(device); }
  auto hasChannels(uint channels) -> bool { return (bool)hasChannels().find(channels); }
  auto hasFrequency(uint frequency) -> bool { return (bool)hasFrequencies().find(frequency); }
  auto hasLatency(uint latency) -> bool { return (bool)hasLatencies().find(latency); }

  virtual auto setExclusive(bool exclusive) -> bool { return true; }
  virtual auto setContext(uintptr context) -> bool { return true; }
  virtual auto setDevice(string device) -> bool { return true; }
  virtual auto setBlocking(bool blocking) -> bool { return true; }
  virtual auto setDynamic(bool dynamic) -> bool { return true; }
  virtual auto setChannels(uint channels) -> bool { return true; }
  virtual auto setFrequency(uint frequency) -> bool { return true; }
  virtual auto setLatency(uint latency) -> bool { return true; }

  virtual auto clear() -> void {}
  virtual auto level() -> double { return 0.5; }
  virtual auto output(const double samples[]) -> void {}

protected:
  Audio& super;
  friend class Audio;

  bool exclusive = false;
  uintptr context = 0;
  string device = "Default";
  bool blocking = false;
  bool dynamic = false;
  uint channels = 0;
  uint frequency = 0;
  uint latency = 0;
};

struct Audio {
  static auto hasDrivers() -> vector<string>;
  static auto hasDriver(string driver) -> bool { return (bool)hasDrivers().find(driver); }
  static auto optimalDriver() -> string;
  static auto safestDriver() -> string;

  Audio() : self(*this) {}
  explicit operator bool() const { return (bool)driver; }
  auto reset() -> void { driver.reset(); }
  auto create(string driver = "") -> bool;
  auto driverName() -> string { return driver->driverName(); }
  auto ready() -> bool { return driver->ready(); }

  auto hasExclusive() -> bool { return driver->hasExclusive(); }
  auto hasContext() -> bool { return driver->hasContext(); }
  auto hasDevices() -> vector<string> { return driver->hasDevices(); }
  auto hasBlocking() -> bool { return driver->hasBlocking(); }
  auto hasDynamic() -> bool { return driver->hasDynamic(); }
  auto hasChannels() -> vector<uint> { return driver->hasChannels(); }
  auto hasFrequencies() -> vector<uint> { return driver->hasFrequencies(); }
  auto hasLatencies() -> vector<uint> { return driver->hasLatencies(); }

  auto hasDevice(string device) -> bool { return driver->hasDevice(device); }
  auto hasChannels(uint channels) -> bool { return driver->hasChannels(channels); }
  auto hasFrequency(uint frequency) -> bool { return driver->hasFrequency(frequency); }
  auto hasLatency(uint latency) -> bool { return driver->hasLatency(latency); }

  auto exclusive() -> bool { return driver->exclusive; }
  auto context() -> uintptr { return driver->context; }
  auto device() -> string { return driver->device; }
  auto blocking() -> bool { return driver->blocking; }
  auto dynamic() -> bool { return driver->dynamic; }
  auto channels() -> uint { return driver->channels; }
  auto frequency() -> uint { return driver->frequency; }
  auto latency() -> uint { return driver->latency; }

  auto setExclusive(bool exclusive) -> bool;
  auto setContext(uintptr context) -> bool;
  auto setDevice(string device) -> bool;
  auto setBlocking(bool blocking) -> bool;
  auto setDynamic(bool dynamic) -> bool;
  auto setChannels(uint channels) -> bool;
  auto setFrequency(uint frequency) -> bool;
  auto setLatency(uint latency) -> bool;

  auto clear() -> void;
  auto level() -> double;
  auto output(const double samples[]) -> void;

protected:
  Audio& self;
  unique_pointer<AudioDriver> driver;
  vector<nall::DSP::Resampler::Cubic> resamplers;
};