#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 = false;
bool RefreshTick = false;

void RtcCallback(void) {
    RtcTick = true;
}

void RefreshCallback(void) {
    RefreshTick = true;
}

typedef struct {
    char Prev;          // Previous digit to fade out
    ushort PrevValue;   // Brightness of previous digit
    char Next;          // Next digit to fade in
    ushort NextValue;   // Brightness of next digit
} Digit;

Digit Digits[NUM_DIGITS] = {0};  // Active per-tube digit setting

int DotNextValue, DotPrevValue;
bool DotIncrement = false;

bool StartupFlag = true;
bool RuntimeFlag = false;

Ticker StartupTicker;
int StartupTickerIter = 1024;

void StartupTickerCallback(void) {

    for (int i = 0; i < NUM_DIGITS; i++) {
        Digits[i].NextValue = (i == 0 && Digits[i].Next == 0) ? 0 : Digits[i].NextValue + 4;
    }

    DotNextValue += 4;

    if (--StartupTickerIter == 0) {
        StartupTicker.detach();
        for (int i = 0; i < NUM_DIGITS; i++) {
            Digits[i].Prev = Digits[i].Next;
        }
        RuntimeFlag = true;
    }
}

Ticker RuntimeTicker;
int RuntimeTickerIter = 1024;

void RuntimeTickerCallback(void) {

    for (int i = 0; i < NUM_DIGITS; i++) {
        if(Digits[i].Prev != Digits[i].Next) {
            Digits[i].PrevValue -= 4;
            Digits[i].NextValue = (i == 0 && Digits[i].Next == 0) ? 0 : Digits[i].NextValue + 4;
        }
    }

    DotNextValue = DotIncrement ? DotNextValue + 4 : DotNextValue - 4;

    if (--RuntimeTickerIter == 0) {
        RuntimeTicker.detach();
        for (int i = 0; i < NUM_DIGITS; i++) {
            Digits[i].Prev = Digits[i].Next;
        }
        DotIncrement = !DotIncrement;
    }
}

int main() {
    
    // Start I2C at 400kHz for DS3231 
    i2c.frequency(400000);
    
    // Start with HV PSU disabled
    HV_EnableOutput(false);
    
    TUSB322_Init();
    PCA9685_Init();
    DS3231_Init(RtcCallback);
    
    // 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(RefreshCallback, 1000);

    // 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

            // If brightness has changed, update both prevous and next digits with new values
            for (int i = 0; i < NUM_DIGITS; i++) {
                if (Digits[i].NextValue != Digits[i].PrevValue) {
                    PCA9685_SetDigit(i, Digits[i].Prev, Digits[i].PrevValue);
                    PCA9685_SetDigit(i, Digits[i].Next, Digits[i].NextValue);
                }
            }

            if (DotNextValue != DotPrevValue) {
                PCA9685_SetDot(DotNextValue);
            }

            // Update previous values to what was just set

            for (int i = 0; i < NUM_DIGITS; i++) {
                Digits[i].PrevValue = Digits[i].NextValue;
            }
            DotPrevValue = DotNextValue;
        }

        if (RtcTick) {
            
            RtcTick = false;

            // On RTC 1Hz ticks, get the time and begin update

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

            Digits[3].Next = nextMinute % 10;
            Digits[2].Next = nextMinute / 10;
            Digits[1].Next = nextHour % 10;
            Digits[0].Next = nextHour / 10;

            if (StartupFlag) {

                // Fade in the current time
                StartupTicker.attach_us(StartupTickerCallback, 900);
                StartupFlag = false;
            } 

            if (RuntimeFlag) {

                // Fade in the new time
                RuntimeTickerIter = 1024;
                RuntimeTicker.attach_us(RuntimeTickerCallback, 900);
            }
        }
    }
}

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);
}