#include <string>

#include "../modules/fmt/include/fmt/format.h"
#include "../modules/pico-onewire/api/one_wire.h"
#include "hardware/i2c.h"
#include "pico/stdlib.h"

#include "config.h"
#include "lcd.h"
#include "relais.h"

// GPIOs used
constexpr uint I2C_SDA_PIN = 26;
constexpr uint I2C_SCL_PIN = 27;
constexpr uint DS18B20_PIN = 28;
constexpr uint RELAIS_PIN = 18;
constexpr uint BUTTON_1_PIN = 17;
constexpr uint BUTTON_2_PIN = 16;
constexpr uint BUTTON_3_PIN = 15;

// Custom chars for the LCD
constexpr char CUSTOM_CHAR_DEG = 0xDF;
constexpr char CUSTOM_CHAR_AE = 0xE1;

// Global variables which have to be accessed by callback function
bool isSystemOn = false;
float temp_tgt{28.0};
absolute_time_t lastPressed = get_absolute_time();

using std::string;

void buttonPressedCallback(uint gpio, [[maybe_unused]] uint32_t events) {
    absolute_time_t now = get_absolute_time();
    if (absolute_time_diff_us(lastPressed, now) < 750000) {
        return;
    } else {
        lastPressed = now;
    }

    switch (gpio) {
    case BUTTON_1_PIN:
        temp_tgt -= 0.5;
        break;
    case BUTTON_2_PIN:
        temp_tgt += 0.5;
        break;
    case BUTTON_3_PIN:
        isSystemOn = !isSystemOn;
        break;
    }
}

int main() {
    // Enable UART so we can print status output
    stdio_init_all();

    // Initialize the LCD
    auto myLCD = LCD(i2c1, I2C_SDA_PIN, I2C_SCL_PIN);
    myLCD.clear();

    // Initialize the temp sensor
    One_wire oneWire(DS18B20_PIN);
    oneWire.init();
    rom_address_t address{};
    oneWire.single_device_read_rom(address);

    // Initialize the relais
    Relais relais(RELAIS_PIN);

    // Initialize the Buttons
    gpio_set_irq_enabled_with_callback(BUTTON_1_PIN, GPIO_IRQ_EDGE_FALL, true,
                                       &buttonPressedCallback);
    gpio_set_irq_enabled_with_callback(BUTTON_2_PIN, GPIO_IRQ_EDGE_FALL, true,
                                       &buttonPressedCallback);
    gpio_set_irq_enabled_with_callback(BUTTON_3_PIN, GPIO_IRQ_EDGE_FALL, true,
                                       &buttonPressedCallback);

    float temp_act{0};
    float temp_diff{0.5};
    string lcdText{};
    bool isHeating = false;
    string heatInfo{""};
    string systemInfo{""};

    lcdText = fmt::format(" G{}rbox Manager\n (Ver. {})", CUSTOM_CHAR_AE,
                          PROJECT_VERSION);
    myLCD.sendString(lcdText);
    sleep_ms(3000);

    while (true) {
        oneWire.convert_temperature(address, true, false);
        temp_act = oneWire.temperature(address);

        if (isSystemOn && temp_act < temp_tgt - temp_diff) {
            isHeating = true;
        } else if (isSystemOn && temp_act > temp_tgt + temp_diff) {
            isHeating = false;
        } else if (!isSystemOn) {
            isHeating = false;
        }

        isHeating ? heatInfo = ">H<" : heatInfo = "   ";
        isSystemOn ? systemInfo = "ON " : systemInfo = "OFF";

        relais.activate(isHeating);

        lcdText = fmt::format("ACT: {:05.2f}{}C {}\nACT: {:05.2f}{}C {}",
                              temp_act, CUSTOM_CHAR_DEG, heatInfo, temp_tgt,
                              CUSTOM_CHAR_DEG, systemInfo);
        myLCD.setCursor(0, 0);
        myLCD.sendString(lcdText);
    }
}