// CC0 1.0 Universal (CC0 1.0)
// Public Domain Dedication
// https://github.com/nmrr

#include <stdio.h>
#include <furi.h>
#include <gui/gui.h>
#include <input/input.h>
#include <notification/notification_messages.h>
#include <furi_hal_random.h>
#include <furi_hal_pwm.h>

#define SCREEN_SIZE_X 128
#define SCREEN_SIZE_Y 64

typedef enum {
    EventTypeInput,
    ClockEventTypeTick,
    EventGPIO,
} EventType;

typedef struct {
    EventType type;
    InputEvent input;
} EventApp;

typedef struct {
    uint32_t counter;
    uint32_t cps, cpm;
    uint8_t line[SCREEN_SIZE_X/2];
    float coef;
} mutexStruct;

static void draw_callback(Canvas* canvas, void* ctx) 
{
    UNUSED(ctx);

    mutexStruct* lfsrMutex = (mutexStruct*)acquire_mutex_block((ValueMutex*)ctx);
    char buffer[32];

    snprintf(buffer, sizeof(buffer), "%ld cps - %ld cpm", lfsrMutex->cps, lfsrMutex->cpm);

    for (int i=0;i<SCREEN_SIZE_X;i+=2)
    {
        float Y = SCREEN_SIZE_Y-(lfsrMutex->line[i/2]*lfsrMutex->coef);
        if (Y < 0) Y = 0;

        canvas_draw_line(canvas, i, Y, i, SCREEN_SIZE_Y);
        canvas_draw_line(canvas, i+1, Y, i+1, SCREEN_SIZE_Y);
    }

    canvas_set_font(canvas, FontPrimary);
    canvas_draw_str_aligned(canvas, 64, 10, AlignCenter, AlignBottom, buffer);

    release_mutex((ValueMutex*)ctx, lfsrMutex);
}

static void input_callback(InputEvent* input_event, void* ctx) 
{
    furi_assert(ctx);
    FuriMessageQueue* event_queue = ctx;
    EventApp event = {.type = EventTypeInput, .input = *input_event};
    furi_message_queue_put(event_queue, &event, FuriWaitForever);
}

static void clock_tick(void* ctx) {
    furi_assert(ctx);

    uint8_t randomuint8[1];
    furi_hal_random_fill_buf(randomuint8,1);
    randomuint8[0] &= 0b00001111;                
    furi_hal_pwm_start(FuriHalPwmOutputIdLptim2PA4, randomuint8[0], 20);

    FuriMessageQueue* queue = ctx;
    EventApp event = {.type = ClockEventTypeTick};
    furi_message_queue_put(queue, &event, 0);
}

static void gpiocallback(void* ctx) {
    furi_assert(ctx);
    FuriMessageQueue* queue = ctx;
    EventApp event = {.type = EventGPIO};
    furi_message_queue_put(queue, &event, 0);
}


int32_t flipper_geiger_app() 
{
    EventApp event;
    FuriMessageQueue* event_queue = furi_message_queue_alloc(8, sizeof(EventApp));

    furi_hal_gpio_init(&gpio_ext_pa7, GpioModeInterruptFall, GpioPullUp, GpioSpeedVeryHigh);
    furi_hal_pwm_start(FuriHalPwmOutputIdLptim2PA4, 5, 20);

    mutexStruct mutexVal;
    mutexVal.counter = 0;
    mutexVal.cps = 0;
    mutexVal.cpm = 0;
    for (int i=0;i<SCREEN_SIZE_X/2;i++) mutexVal.line[i] = 0;
    mutexVal.coef = 1;

    ValueMutex state_mutex;
    init_mutex(&state_mutex, &mutexVal, sizeof(mutexVal));

    ViewPort* view_port = view_port_alloc();
    view_port_draw_callback_set(view_port, draw_callback, &state_mutex);
    view_port_input_callback_set(view_port, input_callback, event_queue);

    furi_hal_gpio_add_int_callback(&gpio_ext_pa7, gpiocallback, event_queue);

    Gui* gui = furi_record_open(RECORD_GUI);
    gui_add_view_port(gui, view_port, GuiLayerFullscreen);

    FuriTimer* timer = furi_timer_alloc(clock_tick, FuriTimerTypePeriodic, event_queue);
    furi_timer_start(timer, 1000);

    while(1) 
    {
        FuriStatus event_status = furi_message_queue_get(event_queue, &event, FuriWaitForever);
        mutexStruct* lfsrMutex = (mutexStruct*)acquire_mutex_block(&state_mutex);

        if (event_status == FuriStatusOk)
        {   
            if(event.type == EventTypeInput) 
            {
                if(event.input.key == InputKeyBack) 
                {
                    release_mutex(&state_mutex, lfsrMutex);
                    break;
                }
                else if(event.input.key == InputKeyOk && event.input.type == InputTypeShort)
                {
                    mutexVal.counter = 0;
                    mutexVal.cps = 0;
                    mutexVal.cpm = 0;
                    for (int i=0;i<SCREEN_SIZE_X/2;i++) mutexVal.line[i] = 0;
                }
            }
            else if (event.type == ClockEventTypeTick)
            {
                for (int i=0;i<SCREEN_SIZE_X/2-1;i++) lfsrMutex->line[SCREEN_SIZE_X/2-1-i] = lfsrMutex->line[SCREEN_SIZE_X/2-2-i]; 

                lfsrMutex->line[0] = lfsrMutex->counter;
                lfsrMutex->cps = lfsrMutex->counter;
                lfsrMutex->counter = 0;

                lfsrMutex->cpm = 0;
                for (int i=0;i<60;i++) lfsrMutex->cpm += lfsrMutex->line[i];

                uint32_t max = lfsrMutex->line[0];
                for (int i=1;i<SCREEN_SIZE_X/2;i++)
                {
                    if (lfsrMutex->line[i] > max) max = lfsrMutex->line[i];
                }

                if (max > 0)
                {
                    lfsrMutex->coef = ((float)(SCREEN_SIZE_Y-15))/((float)max);
                }
            }
            else if (event.type == EventGPIO)
            {
                lfsrMutex->counter = lfsrMutex->counter + 1;
            }
        }

        release_mutex(&state_mutex, lfsrMutex);
        view_port_update(view_port);
    }

    furi_hal_gpio_disable_int_callback(&gpio_ext_pa7);
    furi_hal_gpio_remove_int_callback(&gpio_ext_pa7);
    furi_hal_pwm_stop(FuriHalPwmOutputIdLptim2PA4);

    furi_message_queue_free(event_queue);
    delete_mutex(&state_mutex);
    gui_remove_view_port(gui, view_port);
    view_port_free(view_port);
    furi_timer_free(timer);
    furi_record_close(RECORD_GUI);

    return 0;
}