#include "AppCore.h"
#include "Logs.h"

#define HIBERNATE_DELAY 5000
#define SENSORS_CHECK_INTERVAL 2000
#define SENSORS_REQUEST_DELAY 750
#define TEMP_TRIGGER ((temp_t)(5 * 10.0f))
#define TEMP_INTERVAL ((temp_t)(0.5 * 10.0f))
#define LCD_CHAR_SENSOR 1

#define PIN_ONEWIRE 12
#define PIN_BTN_MODE 11
#define PIN_BTN_MINUS 10
#define PIN_BTN_PLUS 9
#define PIN_LCD_LED 8
#define PIN_LCD_RS 7
#define PIN_LCD_ENABLE 6
#define PIN_LCD_D0 5
#define PIN_LCD_D1 4
#define PIN_LCD_D2 3
#define PIN_LCD_D3 2

#define BUTTONS_COUNT (sizeof(g_buttons) / sizeof(*g_buttons))
#define MODE_SEQUENCE_COUNT (sizeof(m_modeSequence) / sizeof(*m_modeSequence))

AppCore::AppCore()
        : m_appCoreState(new AppCoreState{
        .appState = {
                .lastSensorRequestMs = 0,
                .hasReadSensors = true,
                .water = {
                        .current = TEMP_T_INVALID,
                        .setting = 0,
                        .isActive = false
                },
                .heater = {
                        .current = TEMP_T_INVALID,
                        .setting = 0,
                        .isActive = false
                }
        },
        .uiState = {
                .state = Lighting,
                .lastOpMs = 0,
                .modeSequenceIndex = MODE_SEQUENCE_COUNT - 1,
                .isUpdateNeeded = true
        }
})
          , m_modeSequence{WaterSetting, HeaterSetting, Lighting}
          , m_btnMode{PIN_BTN_MODE}
          , m_btnMinus{PIN_BTN_MINUS}
          , m_btnPlus{PIN_BTN_PLUS}
          , m_buttons{&m_btnMode, &m_btnMinus, &m_btnPlus}
          , m_lcd{PIN_LCD_RS, PIN_LCD_ENABLE, PIN_LCD_D0, PIN_LCD_D1, PIN_LCD_D2, PIN_LCD_D3}
          , m_oneWire{PIN_ONEWIRE}
          , m_sensors{&m_oneWire}
          , m_sensor1{0}
          , m_sensor2{0}
{
}

void AppCore::setup()
{
    Serial.begin(9600);
    LOG_FN_BEGIN(1);

    m_sensors.begin();
    LOG(5, "Found %i sensors", m_sensors.getDeviceCount());
    m_sensors.getAddress(m_sensor1, 0);
    m_sensors.getAddress(m_sensor2, 1);
    m_sensors.setWaitForConversion(false);

    for (auto& g_button : m_buttons)
    {
        g_button->begin();
    }

    pinMode(PIN_LCD_LED, OUTPUT);
    digitalWrite(PIN_LCD_LED, 1);

    m_lcd.begin(16, 2);
    byte sensorChar[8] = {
            B00100,
            B01110,
            B01110,
            B01110,
            B01110,
            B11111,
            B11111,
            B01110,
    };
    m_lcd.createChar(LCD_CHAR_SENSOR, sensorChar);


    bool allButtonsPressed = true;
    for (auto& g_button : m_buttons)
    {
        allButtonsPressed = allButtonsPressed && g_button->isPressed();
    }
    if (!allButtonsPressed)
    {
        LOG(5, "%s: Loading settings", __FUNCTION__);
        m_storage.load(*m_appCoreState);
    }
    else
    {
        LOG(5, "%s: Resetting settings", __FUNCTION__);
        m_storage.save(*m_appCoreState);
    }

    LOG_FN_END(1);
}

void AppCore::loop()
{
    LOG_FN_BEGIN(50);

    const auto& currentMs = millis();

    if (currentMs - m_appCoreState->appState.lastSensorRequestMs >= SENSORS_CHECK_INTERVAL)
    {
        m_appCoreState->appState.lastSensorRequestMs = currentMs;
        m_appCoreState->appState.hasReadSensors = false;
        m_sensors.requestTemperaturesByAddress(m_sensor1);
        m_sensors.requestTemperaturesByAddress(m_sensor2);
    }
    if (currentMs - m_appCoreState->appState.lastSensorRequestMs >= SENSORS_REQUEST_DELAY &&
        !m_appCoreState->appState.hasReadSensors)
    {
        m_appCoreState->appState.hasReadSensors = true;
        readAndUpdateSensors(&m_appCoreState->appState.water, m_sensor1);
        readAndUpdateSensors(&m_appCoreState->appState.heater, m_sensor2);
        checkBoilerItem(&m_appCoreState->appState.water);
        checkBoilerItem(&m_appCoreState->appState.heater);
    }


    for (auto& pButton : m_buttons)
    {
        pButton->read();
        if (pButton->isPressed())
        {
            m_appCoreState->uiState.lastOpMs = currentMs;
            break;
        }
    }


    if (m_appCoreState->uiState.state == Hibernate)
    {
        for (auto& pButton : m_buttons)
        {
            if (pButton->wasReleased())
            {
                setState(Lighting);
                break;
            }
        }
    }
    else
    {
        if (currentMs - m_appCoreState->uiState.lastOpMs >= HIBERNATE_DELAY)
        {
            setState(Hibernate);
        }
        else
        {
            if (m_btnMode.wasReleased())
            {
                m_appCoreState->uiState.modeSequenceIndex =
                        (m_appCoreState->uiState.modeSequenceIndex + 1) % MODE_SEQUENCE_COUNT;
                setState(m_modeSequence[m_appCoreState->uiState.modeSequenceIndex]);
            }
            else if (m_btnMinus.wasReleased() || m_btnPlus.wasReleased())
            {
                BoilerItemState* itemState = nullptr;
                if (m_appCoreState->uiState.state == WaterSetting)
                {
                    itemState = &m_appCoreState->appState.water;
                }
                else if (m_appCoreState->uiState.state == HeaterSetting)
                {
                    itemState = &m_appCoreState->appState.heater;
                }

                if (itemState)
                {
                    if (m_btnMinus.wasReleased())
                    {
                        itemState->setting -= TEMP_INTERVAL;
                    }
                    else if (m_btnPlus.wasReleased())
                    {
                        itemState->setting += TEMP_INTERVAL;
                    }
                    LOG(1, "Setting temp to %i (%i)", itemState->setting, TEMP_INTERVAL);
                    m_appCoreState->uiState.isUpdateNeeded = true;
                }
            }
        }
    }

    if (m_appCoreState->uiState.isUpdateNeeded)
    {
        printState();
    }

    LOG_FN_END(50);
}

void AppCore::setState(
        UiStateEnum state
)
{
    LOG_FN_BEGIN(1);
    LOG(5, "Changing state %i => %i", m_appCoreState->uiState.state, state);

    if (state == Lighting)
    {
        digitalWrite(PIN_LCD_LED, 1);
    }
    else if (state == Hibernate)
    {
        digitalWrite(PIN_LCD_LED, 0);
        m_appCoreState->uiState.modeSequenceIndex = MODE_SEQUENCE_COUNT - 1;
        m_storage.save(*m_appCoreState);
    }
    m_appCoreState->uiState.state = state;
    m_appCoreState->uiState.isUpdateNeeded = true;

    LOG_FN_END(1);
}

void AppCore::checkBoilerItem(
        BoilerItemState* boilerItemState
)
{
    LOG_FN_BEGIN(2);

    if (!boilerItemState->isActive && boilerItemState->current != TEMP_T_INVALID &&
        boilerItemState->current <= boilerItemState->setting - TEMP_TRIGGER)
    {
        boilerItemState->isActive = true;
        m_appCoreState->uiState.isUpdateNeeded = true;
    }
    else if (boilerItemState->isActive &&
             (boilerItemState->current == TEMP_T_INVALID || boilerItemState->current >= boilerItemState->setting))
    {
        boilerItemState->isActive = false;
        m_appCoreState->uiState.isUpdateNeeded = true;
    }

    LOG_FN_END(2);
}

void AppCore::readAndUpdateSensors(
        BoilerItemState* boilerItemState
        , const uint8_t* sensor
)
{
    LOG_FN_BEGIN(2);

    auto raw = m_sensors.getTempC(sensor);
    temp_t temp = TEMP_T_INVALID;
    if (raw != DEVICE_DISCONNECTED_C)
    {
        temp = (temp_t) (raw * 10);
    }

    if (temp != boilerItemState->current)
    {
        boilerItemState->current = temp;
        m_appCoreState->uiState.isUpdateNeeded = true;
    }

    LOG_FN_END(2);
}

void AppCore::printState()
{
    LOG_FN_BEGIN(2);

    m_lcd.setCursor(0, 0);
    printStateLine('S', &m_appCoreState->appState.water, m_appCoreState->uiState.state == WaterSetting,
                   m_appCoreState->appState.water.isActive);
    m_lcd.setCursor(0, 1);
    printStateLine('C', &m_appCoreState->appState.heater, m_appCoreState->uiState.state == HeaterSetting,
                   m_appCoreState->appState.heater.isActive);
    m_appCoreState->uiState.isUpdateNeeded = false;

    LOG_FN_END(2);
}

void
AppCore::printStateLine(
        char prefix
        , const BoilerItemState* boilerItemState
        , bool isModifying
        , bool isActive
)
{
    LOG_FN_BEGIN(2);

    char curTmp[7], setTmp[7], tmp[17];
    tempToStr(curTmp, boilerItemState->current, 5);
    tempToStr(setTmp, boilerItemState->setting, 4);
    int count = snprintf(tmp, sizeof(tmp), "%c:%s [%s]%c%c", prefix, curTmp, setTmp, isModifying ? '<' : ' ',
                         isActive ? LCD_CHAR_SENSOR : ' ');
    for (; count < 17; ++count)
    {
        tmp[count] = ' ';
    }
    tmp[count] = 0;
    m_lcd.print(tmp);

    LOG_FN_END(2);
}

void AppCore::tempToStr(
        char* out
        , temp_t temp
        , signed char width
)
{
    LOG_FN_BEGIN(2);

    LOG(5, "%s: temp=%i", __FUNCTION__, (int)temp);

    if (temp == TEMP_T_INVALID)
    {
        strcpy(out, " --.-");
    }
    else
    {
        dtostrf(temp / 10.0f, width, 1, out);
    }

    LOG_FN_END(2);
}