#include "pico/stdlib.h"
#include "hardware/pwm.h"
#include <stdlib.h>


// Definição dos pinos e frequências das notas
#define BUZZER_PIN 21   // Defina o pino de acordo com a sua conexão
#define LED_PIN 13      // Pino do LED
#define TEMPO 100       // Tempo de duração das notas (em ms)

// Frequências das notas (em Hz) ajustadas para uma oitava abaixo

#define NOTE_B0 31 
#define NOTE_C1 33
#define NOTE_CS1 35
#define NOTE_D1 37
#define NOTE_DS1 39
#define NOTE_E1 41
#define NOTE_F1 44
#define NOTE_FS1 46
#define NOTE_G1 49
#define NOTE_GS1 52
#define NOTE_A1 55
#define NOTE_AS1 58
#define NOTE_B1 62
#define NOTE_C2 65
#define NOTE_CS2 69
#define NOTE_D2 73
#define NOTE_DS2 78
#define NOTE_E2 82
#define NOTE_F2 87
#define NOTE_FS2 93
#define NOTE_G2 98
#define NOTE_GS2 104
#define NOTE_A2 110
#define NOTE_AS2 117
#define NOTE_B2 123
#define NOTE_C3 131
#define NOTE_CS3 139
#define NOTE_D3 147
#define NOTE_DS3 156
#define NOTE_E3 165
#define NOTE_F3 175
#define NOTE_FS3 185
#define NOTE_G3 196
#define NOTE_GS3 208
#define NOTE_A3 220
#define NOTE_AS3 233
#define NOTE_B3 247
#define NOTE_C4 262
#define NOTE_CS4 277
#define NOTE_D4 294
#define NOTE_DS4 311
#define NOTE_E4 330
#define NOTE_F4 349
#define NOTE_FS4 370
#define NOTE_G4 392
#define NOTE_GS4 415
#define NOTE_A4 440
#define NOTE_AS4 466
#define NOTE_B4 494
#define NOTE_C5 523
#define NOTE_CS5 554
#define NOTE_D5 587
#define NOTE_DS5 622
#define NOTE_E5 659
#define NOTE_F5 698
#define NOTE_FS5 740
#define NOTE_G5 784
#define NOTE_GS5 831
#define NOTE_A5 880
#define NOTE_AS5 932
#define NOTE_B5 988
#define NOTE_C6 1047
#define NOTE_CS6 1109
#define NOTE_D6 1175
#define NOTE_DS6 1245
#define NOTE_E6 1319
#define NOTE_F6 1397
#define NOTE_FS6 1480
#define NOTE_G6 1568
#define NOTE_GS6 1661
#define NOTE_A6 1760
#define NOTE_AS6 1865
#define NOTE_B6 1976
#define NOTE_C7 2093
#define NOTE_CS7 2217
#define NOTE_D7 2349
#define NOTE_DS7 2489
#define NOTE_E7 2637
#define NOTE_F7 2794
#define NOTE_FS7 2960
#define NOTE_G7 3136
#define NOTE_GS7 3322
#define NOTE_A7 3520
#define NOTE_AS7 3729
#define NOTE_B7 3951
#define NOTE_C8 4186
#define NOTE_CS8 4435
#define NOTE_D8 4699
#define NOTE_DS8 4978
#define REST      0


// Melodia fornecida (Pulo da Gaita)
int melody[] = {
    NOTE_C5,4, NOTE_G4,8, NOTE_AS4,4, NOTE_A4,8,
    NOTE_G4,16, NOTE_C4,8, NOTE_C4,16, NOTE_G4,16, NOTE_G4,8, NOTE_G4,16,
    NOTE_C5,4, NOTE_G4,8, NOTE_AS4,4, NOTE_A4,8,
    NOTE_G4,2,
    
    NOTE_C5,4, NOTE_G4,8, NOTE_AS4,4, NOTE_A4,8,
    NOTE_G4,16, NOTE_C4,8, NOTE_C4,16, NOTE_G4,16, NOTE_G4,8, NOTE_G4,16,
    NOTE_F4,8, NOTE_E4,8, NOTE_D4,8, NOTE_C4,8,
    NOTE_C4,2,
    
    NOTE_C5,4, NOTE_G4,8, NOTE_AS4,4, NOTE_A4,8,
    NOTE_G4,16, NOTE_C4,8, NOTE_C4,16, NOTE_G4,16, NOTE_G4,8, NOTE_G4,16,
    NOTE_C5,4, NOTE_G4,8, NOTE_AS4,4, NOTE_A4,8,
    NOTE_G4,2,
    
    NOTE_C5,4, NOTE_G4,8, NOTE_AS4,4, NOTE_A4,8,
    NOTE_G4,16, NOTE_C4,8, NOTE_C4,16, NOTE_G4,16, NOTE_G4,8, NOTE_G4,16,
    NOTE_F4,8, NOTE_E4,8, NOTE_D4,8, NOTE_C4,8,
    NOTE_C4,16, NOTE_D5,8, NOTE_D5,16, NOTE_D5,16, NOTE_D5,8, NOTE_D5,16,
    
    NOTE_D5,16, NOTE_D5,8, NOTE_D5,16, NOTE_C5,8, NOTE_E5,-8,
    NOTE_C5,8, NOTE_C5,16, NOTE_E5,16, NOTE_E5,8, NOTE_C5,16,
    NOTE_F5,8, NOTE_D5,8, NOTE_D5,8, NOTE_E5,-8,
    NOTE_C5,8, NOTE_D5,16, NOTE_E5,16, NOTE_D5,8, NOTE_C5,16,
    
    NOTE_F5,8, NOTE_F5,8, NOTE_A5,8, NOTE_G5,-8,
    NOTE_G5,8, NOTE_C5,16, NOTE_C5,16, NOTE_C5,8, NOTE_C5,16,
    NOTE_F5,-8, NOTE_E5,16, NOTE_D5,8, NOTE_C5,4,
    NOTE_C5,16, NOTE_C5,16, NOTE_C5,16, NOTE_C5,16,
    
    NOTE_F5,8, NOTE_F5,16, NOTE_A5,8, NOTE_G5,-8,
    NOTE_G5,8, NOTE_C5,16, NOTE_C5,16, NOTE_C5,8, NOTE_C5,16,
    NOTE_F5,16, NOTE_E5,8, NOTE_D5,16, NOTE_C5,8, NOTE_E5,-8,
    NOTE_C5,8, NOTE_D5,16, NOTE_E5,16, NOTE_D5,8, NOTE_C5,16,
    
    NOTE_F5,8, NOTE_F5,16, NOTE_A5,8, NOTE_G5,-8,
    NOTE_G5,8, NOTE_C5,16, NOTE_C5,16, NOTE_C5,8, NOTE_C5,16,
    NOTE_F5,8, NOTE_E5,16, NOTE_D5,8, NOTE_C5,8,
    NOTE_C5,4, NOTE_G4,8, NOTE_AS4,4, NOTE_A4,8,
    
    NOTE_G4,16, NOTE_C4,8, NOTE_C4,16, NOTE_G4,16, NOTE_G4,8, NOTE_G4,16,
    NOTE_C5,4, NOTE_G4,8, NOTE_AS4,4, NOTE_A4,8,
    NOTE_G4,2,
    NOTE_C5,4, NOTE_G4,8, NOTE_AS4,4, NOTE_A4,8,
    
    NOTE_G4,16, NOTE_C4,8, NOTE_C4,16, NOTE_G4,16, NOTE_G4,8, NOTE_G4,16,
    NOTE_F4,8, NOTE_E4,8, NOTE_D4,8, NOTE_C4,-2,
    NOTE_C5,4, NOTE_G4,8, NOTE_AS4,4, NOTE_A4,8,
    
    NOTE_G4,16, NOTE_C4,8, NOTE_C4,16, NOTE_G4,16, NOTE_G4,8, NOTE_G4,16,
    NOTE_C5,4, NOTE_G4,8, NOTE_AS4,4, NOTE_A4,8,
    NOTE_G4,2,
    NOTE_C5,4, NOTE_G4,8, NOTE_AS4,4, NOTE_A4,8,
    
    NOTE_G4,16, NOTE_C4,8, NOTE_C4,16, NOTE_G4,16, NOTE_G4,8, NOTE_G4,16,
    NOTE_F4,8, NOTE_E4,8, NOTE_D4,8, NOTE_C4,-2,
    NOTE_C4,16, NOTE_C4,8, NOTE_C4,16, NOTE_E4,16, NOTE_E4,8, NOTE_E4,16,
    NOTE_F4,16, NOTE_F4,8, NOTE_F4,16, NOTE_FS4,16, NOTE_FS4,8, NOTE_FS4,16,
    
    NOTE_G4,8, REST,8, NOTE_AS4,8, NOTE_C5,1,
};

int notes = sizeof(melody) / sizeof(melody[0]) / 2;  // Calcula o número de notas
int wholenote = (38000 * 4) / TEMPO;  // Calcula a duração da nota inteira em ms
int divider = 0, noteDuration = 0;

// Função para configurar o buzzer com PWM
void configurar_buzzer(uint pin) {
    gpio_set_function(pin, GPIO_FUNC_PWM);
    uint slice_num = pwm_gpio_to_slice_num(pin);
    pwm_set_clkdiv(slice_num, 4.0); // Ajusta o divisor de clock para uma frequência mais baixa
    pwm_set_wrap(slice_num, 16438);  // Ajuste o valor de wrap
}

// Função para emitir som no buzzer
void emitir_som(uint pin, int frequencia, int duracao_ms) {
    if (frequencia == REST) {
        pwm_set_gpio_level(pin, 0);  // Desliga o buzzer durante a pausa
    } else {
        uint slice_num = pwm_gpio_to_slice_num(pin);
        pwm_set_gpio_level(pin, 4094);  // Gera som (metade do valor de wrap)
        pwm_set_clkdiv(slice_num, 6192.0 / frequencia); // Ajusta a frequência
    }
    sleep_ms(duracao_ms);  // Espera pelo tempo da nota ou pausa
    pwm_set_gpio_level(pin, 0); // Desliga o som após a duração
}

// Função para configurar o LED
void configurar_led(uint pin) {
    gpio_init(pin);
    gpio_set_dir(pin, GPIO_OUT);
}

// Função para acender o LED
void acender_led(uint pin) {
    gpio_put(pin, 1);
}

// Função para apagar o LED
void apagar_led(uint pin) {
    gpio_put(pin, 0);
}

void setup() {
    stdio_init_all();  // Inicializa a comunicação serial
    configurar_buzzer(BUZZER_PIN); // Configura o buzzer
    configurar_led(LED_PIN);       // Configura o LED


    // Loop para tocar a melodia
    for (int thisNote = 0; thisNote < notes * 2; thisNote = thisNote + 2) {
        divider = melody[thisNote + 1];
        if (divider > 0) {
            noteDuration = (wholenote) / divider;
        } else if (divider < 0) {
            noteDuration = (wholenote) / abs(divider);
            noteDuration *= 1.5; // Aumenta a duração para notas pontuadas
        }

        // Acende o LED no início da nota
        acender_led(LED_PIN);
        // Toca a nota
        emitir_som(BUZZER_PIN, melody[thisNote], noteDuration * 0.9);
        // Apaga o LED no final da nota
        apagar_led(LED_PIN);
        
        sleep_ms(noteDuration);  // Espera a duração da nota
    }
}

int main() {
     // Inicializa a melodia
    while (true) {
       setup();  // O loop principal pode ficar vazio, pois a melodia já foi tocada na função setup()
    }
    return 0;
}