/*
 * menu.c — wersja z transmisją HIH8120 w tle
 *
 * Created: 30.05.2025
 * Author : Student
 */

#include <avr/io.h>
#define F_CPU 11059200UL
#include <util/delay.h>
#include <avr/interrupt.h>
#include <stdio.h>
#include "lcd.h"
#include "ds18b20.h"
#include "spi.h"

#define HIH8120_ADDR 0x27

volatile int8_t ekran = 0;      // 0..6
volatile int8_t subscreen = 0;  // 0 lub 1
volatile uint8_t running = 1;   // sekundnik ON/OFF

volatile uint8_t MSB_H, LSB_H, MSB_T, LSB_T;
volatile uint16_t res_H, res_T;
volatile uint16_t humidity, temperature; // *100

void encoder_init(void) {
    DDRD &= ~((1 << PD2) | (1 << PD3) | (1 << PD4));
    PORTD |= (1 << PD2) | (1 << PD3) | (1 << PD4);
    MCUCR |= (1 << ISC01); MCUCR &= ~(1 << ISC00);
    GICR |= (1 << INT0);
    sei();
}

ISR(INT0_vect) {
    if (subscreen == 1) {
        subscreen = 0;
        return;
    }

    if (PIND & (1 << PD3)) ekran++;
    else ekran--;

    if (ekran > 6) ekran = 0;
    if (ekran < 0) ekran = 6;
    subscreen = 0;
}

// --- TWI (I2C) ---
void TWI_start(void) {
    TWCR = (1 << TWEN) | (1 << TWSTA) | (1 << TWINT);
    while (!(TWCR & (1 << TWINT)));
    _delay_ms(10);
}

void TWI_address_transmit(void) {
    TWDR = 0b01001000;
    TWCR = (1 << TWEN) | (1 << TWINT);
    while (!(TWCR & (1 << TWINT)));
    _delay_ms(10);
}

void TWI_address_receive(void) {
    TWDR = 0b01001001;
    TWCR = (1 << TWEN) | (1 << TWINT);
    while (!(TWCR & (1 << TWINT)));
    _delay_ms(10);
}

uint8_t TWI_receive_ACK(void) {
    TWCR = (1 << TWEN) | (1 << TWINT) | (1 << TWEA);
    while (!(TWCR & (1 << TWINT)));
    return TWDR;
}

uint8_t TWI_receive_NACK(void) {
    TWCR = (1 << TWEN) | (1 << TWINT);
    while (!(TWCR & (1 << TWINT)));
    return TWDR;
}

void TWI_stop(void) {
    TWCR = (1 << TWEN) | (1 << TWSTO);
    _delay_ms(10);
}

void TWI_calc(void) {
    res_H = ((uint16_t)(MSB_H & 0x3F) << 8) | LSB_H;
    humidity = (uint16_t)(((float)res_H / 16382.0f) * 10000.0f);
    res_T = ((uint16_t)(MSB_T) << 6) | (LSB_T >> 2);
    temperature = (uint16_t)(((float)res_T / 16382.0f) * 16500.0f - 4000.0f);
}

int main(void) {
    lcd_init();
    encoder_init();
    ds18b20_init();
    SPI_MasterInit();
    _delay_ms(50);

    DDRB = 0xFF;
    PORTB = 0x00;

    uint16_t sekundy = 0;
    char buf[17];

    static uint8_t counter = 0;

    while (1) {
        // Co ~10 pętli — odśwież komunikację HIH8120
        counter++;
        if (counter > 10) {  // około co 3 sekundy
            counter = 0;

            TWI_start();
            TWI_address_transmit();
            TWI_stop();

            _delay_ms(50);

            TWI_start();
            TWI_address_receive();

            MSB_H = TWI_receive_ACK();
            LSB_H = TWI_receive_ACK();
            MSB_T = TWI_receive_ACK();
            LSB_T = TWI_receive_NACK();

            TWI_stop();
            TWI_calc();
        }

        lcd_clear();

        if (!(PIND & (1 << PD4))) {
            _delay_ms(300);
            if (ekran == 2) {
                lcd_show_startstop(running);
                running = !running;
            } else if (ekran != 3) {
                lcd_show_loading();
                subscreen = 1;
            }
            while (!(PIND & (1 << PD4))) _delay_ms(10);
        }

        switch (ekran) {
            case 0:
                if (subscreen == 0) {
                    lcd_gotoxy(0, 0); lcd_puts("Imie, nazwisko");
                } else {
                    lcd_gotoxy(0, 0); lcd_puts("Daniel");
                    lcd_gotoxy(0, 1);
                    lcd_send_byte(0, 1); lcd_puts("wi");
                    lcd_send_byte(1, 1); lcd_puts("cki");
                }
                break;

            case 1:
                if (subscreen == 0) {
                    lcd_gotoxy(0, 0); lcd_puts("Numer indeksu");
                } else {
                    lcd_gotoxy(0, 0); lcd_puts("275777");
                }
                break;

            case 2:
                lcd_gotoxy(0, 0); lcd_puts("Czas:");
                lcd_gotoxy(0, 1);
                sprintf(buf, "%us", sekundy);
                lcd_puts(buf);
                if (running) sekundy++;
                _delay_ms(1000);
                break;

            case 3:
                lcd_gotoxy(0, 0); lcd_puts("Resetuj czas");
                lcd_gotoxy(0, 1); lcd_puts("Wcisnij przycisk");
                break;

            case 4:
                if (subscreen == 0) {
                    lcd_gotoxy(0, 0); lcd_puts("Temperatura");
                } else {
                    lcd_gotoxy(0, 0); lcd_puts("Temperatura:");
                    int16_t temp_raw = ds18b20_read_temp();
                    if (temp_raw == -1000) {
                        lcd_gotoxy(0, 1); lcd_puts("Brak czujnika");
                    } else {
                        int16_t temp_c = temp_raw / 16;
                        uint16_t temp_frac = ((temp_raw & 0x0F) * 625) / 100;
                        lcd_gotoxy(0, 1);
                        sprintf(buf, "%d.%02d%cC", temp_c, temp_frac, 223);
                        lcd_puts(buf);
                    }
                }
                break;

            case 5:
                if (subscreen == 0) {
                    lcd_gotoxy(0, 0); lcd_puts("Temp z czujnika");
                    lcd_gotoxy(0, 1); lcd_puts("SPI TC77");
                } else {
                    lcd_gotoxy(0, 0); lcd_puts("Temperatura:");
                    int16_t raw = readTemperatureRaw_TC77();

                    if (raw == 0xFFFF) {
                        lcd_gotoxy(0, 1); lcd_puts("Brak SPI danych");
                    } else {
                        float temp = raw * 0.0625;
                        int8_t cal = (int8_t)temp;
                        uint8_t frac = (uint8_t)((temp - cal) * 100);

                        lcd_gotoxy(0, 1);
                        sprintf(buf, "%d.%02d%cC", cal, frac, 223);
                        lcd_puts(buf);
                    }
                }
                break;

            case 6:
                lcd_gotoxy(0, 0);
                sprintf(buf, "Temp: %d.%02d C", temperature / 100, temperature % 100);
                lcd_puts(buf);

                lcd_gotoxy(0, 1);
                sprintf(buf, "Wilg: %d.%02d %%", humidity / 100, humidity % 100);
                lcd_puts(buf);
                break;
        }

        _delay_ms(300);
    }
}