#include "Audio_Player.h"
#include "Audio.h"

Audio audio;
TaskHandle_t audioTaskHandle = NULL;
volatile bool isAudioTaskRunning = false;
uint8_t currentVolume = 12; // 0 to 21 range

uint16_t Audio_Count = 0;
char Audio_Names[100][100];

// FreeRTOS background task on Core 0 to run ESP32-audioI2S decode loop
void audioLoopTask(void* parameter) {
  isAudioTaskRunning = true;
  while (isAudioTaskRunning) {
    audio.loop();
    vTaskDelay(pdMS_TO_TICKS(1)); // Yield to let other RTOS tasks run
  }
  audioTaskHandle = NULL;
  vTaskDelete(NULL);
}

void initAudioPlayer() {
  audio.setPinout(I2S_BCLK, I2S_LRCK, I2S_DIN);
  audio.setVolume(currentVolume);
  
  // Start the background loop task on Core 0
  if (audioTaskHandle == NULL) {
    xTaskCreatePinnedToCore(
      audioLoopTask,
      "audioLoopTask",
      16384, // Increased from 8192 — ESP32-audioI2S MP3 decode needs ~12-16KB stack
      NULL,
      5, // Priority
      &audioTaskHandle,
      0  // Core 0
    );
  }
}

void playAudio(const char* filePath) {
  printf("AudioPlayer: Connecting to FS for file: %s\r\n", filePath);
  audio.connecttoFS(SD_MMC, filePath);
}

void stopAudio() {
  audio.stopSong();
}

void pauseResumeAudio() {
  audio.pauseResume();
}

bool isAudioPlaying() {
  return audio.isRunning();
}

void setPlayerVolume(uint8_t volume) {
  if (volume > 21) volume = 21;
  currentVolume = volume;
  audio.setVolume(currentVolume);
  printf("AudioPlayer: Volume set to %d / 21\r\n", currentVolume);
}

uint8_t getPlayerVolume() {
  return currentVolume;
}

// Case-insensitive check if filename ends with a given extension
static bool hasExtension(const char* name, const char* ext) {
  size_t nLen = strlen(name);
  size_t eLen = strlen(ext);
  if (nLen < eLen) return false;
  return strcasecmp(name + nLen - eLen, ext) == 0;
}

void Search_Audio(const char* directory) {
  File Path = SD_MMC.open(directory);
  if (!Path) {
    printf("Path: <%s> does not exist\r\n", directory);
    Audio_Count = 0;
    return;
  }
  
  uint16_t fileCount = 0;
  File file = Path.openNextFile();
  while (file && fileCount < 100) {
    if (!file.isDirectory()) {
      const char* name = file.name();
      // Case-insensitive extension match to handle FAT32 uppercase names
      if (hasExtension(name, ".wav") || hasExtension(name, ".mp3")) {
        strncpy(Audio_Names[fileCount], name, sizeof(Audio_Names[fileCount]) - 1);
        Audio_Names[fileCount][sizeof(Audio_Names[fileCount]) - 1] = '\0';
        fileCount++;
      }
    }
    file = Path.openNextFile();
  }
  Path.close();
  Audio_Count = fileCount;
  printf("Found %d audio files (.mp3/.wav)\r\n", Audio_Count);
}