#pragma once
#include <cstdint>

namespace Config {

    // Serial Configuration
    constexpr int SERIAL_BAUD_RATE = 115200;     // Serial communication baud rate

    // WiFi Configuration
    constexpr const char* WIFI_AP_NAME = "ESP32Piano";  // AP name when in configuration mode
    constexpr const char* WIFI_AP_PASSWORD = "12345678"; // AP password when in configuration mode
    constexpr uint32_t WIFI_CONFIG_TIMEOUT = 180;  // Seconds to wait for WiFi configuration
    constexpr uint32_t WIFI_CONFIG_PORT = 80;      // Web configuration portal port

    // I2S Pin Configuration
    constexpr int I2S_MIC_SERIAL_CLOCK = 8;      // SCK
    constexpr int I2S_MIC_LEFT_RIGHT_CLOCK = 9;  // WS/LRC 
    constexpr int I2S_MIC_SERIAL_DATA = 10;      // SD

    // I2S Configuration
    constexpr int SAMPLE_RATE = 8000;            // Hz - good for frequencies up to 4kHz
    constexpr int BITS_PER_SAMPLE = 16;          // Changed to 16-bit
    constexpr int CHANNELS = 1;                  // Mono input
    constexpr int SAMPLE_BUFFER_SIZE = 1024;     // Match FFT_SIZE for efficiency

    // DMA Configuration
    constexpr int DMA_BUFFER_COUNT = 4;          // Reduced for lower latency
    constexpr int DMA_BUFFER_LEN = 512;          // Smaller chunks for faster processing

    // Audio Processing
    constexpr float DC_OFFSET = 0.0f;            // DC offset correction
    constexpr float GAIN = 4.0f;                 // Increased gain for better note detection
    constexpr int16_t NOISE_THRESHOLD = 100;     // Lower threshold for 16-bit samples
    constexpr int16_t DEFAULT_RANGE_LIMIT = 32767; // Max value for 16-bit
    constexpr float DECAY_FACTOR = 0.7f;         // Faster decay for quicker note changes

    // FFT Configuration
    constexpr int FFT_SIZE = 1024;              // Must be power of 2, gives ~7.8 Hz resolution at 8kHz
    constexpr float FREQUENCY_RESOLUTION = static_cast<float>(SAMPLE_RATE) / FFT_SIZE;
    
    // Piano Note Frequencies (Hz)
    constexpr float NOTE_FREQ_C2 = 65.41f;      // Lowest note we'll detect
    constexpr float NOTE_FREQ_C3 = 130.81f;
    constexpr float NOTE_FREQ_C4 = 261.63f;     // Middle C
    constexpr float NOTE_FREQ_C5 = 523.25f;
    constexpr float NOTE_FREQ_C6 = 1046.50f;    // Highest note we'll detect
    
    // Note Detection Parameters
    constexpr float FREQUENCY_TOLERANCE = 3.0f;   // Hz tolerance, increased for better detection
    constexpr float MIN_MAGNITUDE_THRESHOLD = 500.0f; // Adjusted for 16-bit samples
    constexpr int MAX_SIMULTANEOUS_NOTES = 7;    // Maximum number of notes to detect simultaneously
    constexpr float PEAK_RATIO_THRESHOLD = 0.1f; // Peaks must be at least this ratio of the strongest peak

    // Timing and Debug
    constexpr uint32_t LEVEL_UPDATE_INTERVAL_MS = 50;   // Faster updates for better responsiveness
    constexpr bool ENABLE_DEBUG = true;                 // Enable debug output
    constexpr int DEBUG_INTERVAL_MS = 1000;            // Debug print interval

    // System Configuration
    constexpr uint32_t TASK_STACK_SIZE = 4096;   // Audio task stack size
    constexpr uint8_t TASK_PRIORITY = 2;         // Increased priority for more consistent timing
    constexpr uint8_t TASK_CORE = 1;            // Run on second core to avoid interference

    // Calibration Parameters
    constexpr bool CALIBRATION_MODE = false;     // Set to true to enable calibration output
    constexpr int CALIBRATION_DURATION_MS = 5000; // Duration to collect calibration data
    constexpr float CALIBRATION_PEAK_PERCENTILE = 0.95f; // Use 95th percentile for thresholds
    
    // Note Detection Timing
    constexpr int NOTE_PRINT_INTERVAL_MS = 100;  // How often to print detected notes
    constexpr int MIN_NOTE_DURATION_MS = 50;     // Minimum duration to consider a note valid
    constexpr int NOTE_RELEASE_TIME_MS = 100;    // Time before considering a note released

    // Serial Commands
    constexpr char CMD_HELP = 'h';           // Show help
    constexpr char CMD_CALIBRATE = 'c';      // Start calibration
    constexpr char CMD_THRESHOLD_UP = '+';   // Increase sensitivity
    constexpr char CMD_THRESHOLD_DOWN = '-';  // Decrease sensitivity
    constexpr char CMD_TOGGLE_SPECTRUM = 's'; // Toggle spectrum display
    constexpr float THRESHOLD_STEP = 0.1f;   // Threshold adjustment step

    // Command Response Messages
    constexpr const char* MSG_HELP = 
        "Commands:\n"
        "h - Show this help\n"
        "c - Start calibration\n"
        "+ - Increase sensitivity\n"
        "- - Decrease sensitivity\n"
        "s - Toggle spectrum display\n";
}