#include "mbed.h"
#include "main.h"
#include "SWO.h"
#include "pca9685.h"
#include "tusb322.h"
#include "ds3231.h"
#include "ioc.h"
#include "animation.h"

I2C i2c(PA_10, PA_9);
// SWO_Channel swo("swo");

bool RtcTick, RefreshTick, RngTick;

typedef struct {
    char Value;
    ushort Reg;
    bool Active;
    bool Increment;
} DIGIT;

typedef struct {
    DIGIT Digits[MAX_FADE_DIGITS];
    DIGIT *NextDigit;
    DIGIT *PrevDigit;
    bool Updated;
    bool RefreshActive;
} TUBE;

TUBE Tube[NUM_TUBES] = {0};  // Active per-tube digit setting

ushort DotValue = PCA9685_Min_Brightness;
bool DotUpdated = false;
bool DotIncrement = true;

Ticker StartupUpdateTicker, RuntimeUpdateTicker, RngUpdateTicker;
int StartupTickerIter, RuntimeTickerIter, RngTickerIter;


void RtcTickCallback(void) {
    RtcTick = true;
}

void RefreshTickCallback(void) {
    RefreshTick = true;
}

void RngTickCallback(void) {
    RngTick = true;
}

void RuntimeTickerUpdate(void) {

    for (int i = 0; i < NUM_TUBES; i++) {

        if(!Tube[i].RefreshActive) {

            for (int j = 0; j < MAX_FADE_DIGITS; j++) {

                DIGIT *digit = &Tube[i].Digits[j];

                if (digit->Active) {

                    if (digit->Increment && digit->Reg < PCA9685_Max_Brightness) {
                        digit->Reg += FADE_TICK_STEP;
                    } else if (digit->Reg > PCA9685_Min_Brightness) {
                        digit->Reg -= FADE_TICK_STEP;
                    }

                    Tube[i].Updated = true;
                }
            }
        }
    }

    DotValue = DotIncrement ? DotValue + FADE_TICK_STEP : DotValue - FADE_TICK_STEP;
    DotUpdated = true;

    if (--RuntimeTickerIter == 0) {
        RuntimeUpdateTicker.detach();
        DotIncrement = !DotIncrement;
    }
}

void RngTickerUpdate(void) {


    if (--RngTickerIter == 0) {
        RngUpdateTicker.detach();
    }
}

int main() {

    // Initialize pointers in global data structure
    for (int i = 0; i < NUM_TUBES; i++) {
        Tube[i].NextDigit = &Tube[i].Digits[0];
    }

    RtcTick = false;
    RefreshTick = false;
    RngTick = false;

    int nextSecond, nextMinute, nextHour;
    int prevMinute, prevHour;
    bool startup = true;
    
    // Start I2C at 400kHz for DS3231 
    i2c.frequency(400000);
    
    // Start with HV PSU disabled
    HV_EnableOutput(false);
    
    TUSB322_Init();
    PCA9685_Init();
    DS3231_Init(RtcTickCallback);

    // Enable HV PSU
    HV_EnableOutput(true);
    
    // Set PCA9685 input voltage to highest possible
    PCA9685_SetVoltage(1.0);
    
    // swo.printf("CPU SystemCoreClock is %d Hz\r\n", SystemCoreClock);
    
    // Bump I2C frequency to 1MHz
    // i2c.frequency(1000000);

    // Setup a ticker to refresh the display at 1kHz
    Ticker refreshTicker;
    refreshTicker.attach_us(RefreshTickCallback, DIGIT_REFRESH_RATE_US);

    // Kick off the RNG ticker at 0.1Hz
    // Ticker rngTicker;
    // rngTicker.attach(RngTickCallback, DIGIT_RNG_REFRESH_RATE_S);

    // DS3231_SetTime(0, 55, 6, true);
    // DS3231_SetDate(0, 2, 12, 18, 0);

    while(1) {

        // Animate_Cycle_Basic();
        // Animate_Cycle_Analog();
        // Animate_Cycle_Low_Pwm();
        // Animate_Cycle_Pwm();
        // Animate_Cycle_Fade();
        // Animate_Cycle_Fade_Random();
        // Animate_Cycle_Fast();
        // Animate_Cycle_Fast_Random();

        if (RefreshTick) {
            RefreshTick = false;

            // On refresh, update the display with new values

            for (int i = 0; i < NUM_TUBES; i++) {
                if (Tube[i].Updated) {
                    Tube[i].Updated = false;

                    for (int j = 0; j < MAX_FADE_DIGITS; j++) {
                        DIGIT *digit = &Tube[i].Digits[j];
                        if (digit->Active) {
                            PCA9685_SetDigit(i, digit->Value, digit->Reg);
                            if (digit->Reg == 0 && !digit->Increment) {
                                digit->Active = false;
                            }
                        }
                    }
                }
            }

            if (DotUpdated) {
                PCA9685_SetDot(DotValue);
                DotUpdated = false;
            }
        }

        if (RtcTick) {
            RtcTick = false;

            prevMinute = nextMinute;
            prevHour = nextHour;

            DS3231_GetTime(&nextSecond, &nextMinute, &nextHour);

            if (startup) {
                startup = false;

                for (int i = 0; i < NUM_TUBES; i++) {

                    bool Update = false;
                    if (i == 0 && nextHour / 10 != 0) {
                        Tube[i].NextDigit->Value = nextHour / 10;
                        Update = true;
                    } else if (i == 1) {
                        Tube[i].NextDigit->Value = nextHour % 10;
                        Update = true;
                    } else if (i == 2) {
                        Tube[i].NextDigit->Value = nextMinute / 10;
                        Update = true;
                    } else if (i == 3) {
                        Tube[i].NextDigit->Value = nextMinute % 10;
                        Update = true;
                    }

                    if (Update) {

                        Tube[i].NextDigit->Increment = true;
                        Tube[i].NextDigit->Active = true;
                        Tube[i].PrevDigit = Tube[i].NextDigit;
                        Tube[i].NextDigit = (Tube[i].NextDigit == &Tube[i].Digits[0]) ? 
                            &Tube[i].Digits[1] : &Tube[i].Digits[0];
                    }
                }

            } else {

                for (int i = 0; i < NUM_TUBES; i++) {

                    bool Update = false;
                    if (i == 0 && ((prevHour / 10) != (nextHour / 10))) {
                        if (nextHour / 10 != 0) {
                            Tube[i].NextDigit->Value = nextHour / 10;
                            Tube[i].NextDigit->Increment = true;
                            Tube[i].NextDigit->Active = true;
                        }
                        Update = true;
                    } else if (i == 1 && ((prevHour % 10) != (nextHour % 10))) {
                        Tube[i].NextDigit->Value = nextHour % 10;
                        Tube[i].NextDigit->Increment = true;
                        Tube[i].NextDigit->Active = true;
                        Update = true;
                    } else if (i == 2 && ((prevMinute / 10) != (nextMinute / 10))) {
                        Tube[i].NextDigit->Value = nextMinute / 10;
                        Tube[i].NextDigit->Increment = true;
                        Tube[i].NextDigit->Active = true;
                        Update = true;
                    } else if (i == 3 && ((prevMinute % 10) != (nextMinute % 10))) {
                        Tube[i].NextDigit->Value = nextMinute % 10;
                        Tube[i].NextDigit->Increment = true;
                        Tube[i].NextDigit->Active = true;
                        Update = true;
                    }

                    if (Update) {
                        Tube[i].PrevDigit->Increment = false;
                        Tube[i].PrevDigit = Tube[i].NextDigit;
                        Tube[i].NextDigit = (Tube[i].NextDigit == &Tube[i].Digits[0]) ? 
                            &Tube[i].Digits[1] : &Tube[i].Digits[0];
                    }
                }
            }

            // Fade in the new time
            RuntimeTickerIter = FADE_TICKS;
            RuntimeUpdateTicker.attach(RuntimeTickerUpdate, (float)(DIGIT_REFRESH_RATE_US / 1000) / RuntimeTickerIter);
        }

        if (RngTick) {

            // Choose a random tube to refresh
            Tube[rand() % 4].RefreshActive = true;

            RngTickerIter = DIGIT_RNG_REFRESH_ITER * FADE_TICKS;
            RngUpdateTicker.attach(RngTickerUpdate, (DIGIT_REFRESH_RATE_US/1000)/FADE_TICKS);
            RngTick = false;
        }
    }
}

void I2C_Write(int DeviceAddress, char RegAddress, char *Data, int Length) {
    char buffer[I2C_MAX_BUFFER+1] = {0};

    if (Length > I2C_MAX_BUFFER) LED_Fault(1);

    buffer[0] = RegAddress;
    memcpy(&buffer[1], Data, Length);

    i2c.write(DeviceAddress << 1, buffer, Length + 1);
}

void I2C_Read(int DeviceAddress, char RegAddress, char *Data, int Length) {
    
    i2c.write(DeviceAddress << 1, &RegAddress, 1);
    i2c.read(DeviceAddress << 1, Data, Length);
}