///
//
// leds.h defines structs and functions for addressing an HD107s ledstrip over serial using the GPIO pins.
//
///

#ifndef _potion_leds_h
#define _potion_leds_h

#include <FreeRTOS.h>
#include <freertos/task.h>
#include <freertos/semphr.h>
#include "esp_system.h"

enum LedsSendStatus {
    LEDS_SEND_WAITING,
    LEDS_SEND_REQUESTED,
    LEDS_SENDING,
};

// pack the struct to match exactly 8 * 4 = 32bits
struct __attribute__((__packed__)) LedComponents {
    // RGB component values
    uint8_t red;
    uint8_t green;
    uint8_t blue;
    uint8_t global; // global baseline brightness, highest 3 bits should always be ones
};

// union of components and their representation as a u32
// allows for easier sending of data over serial
union Led {
    struct LedComponents components;
    uint32_t bits;
};

// point on a gradient
struct GradientPoint {
    union Led led;    // value of the led at this point
    size_t offset;      // offset (measured in leds) from the beginning
    short movement;     // direction of movement over time
};

struct Gradient {
    struct GradientPoint points[16]; // array of gradient points, support at most 16 points in a gradient
    size_t points_len;                           // number of used gradient points
    float duration;                       // amount of time to allow this gradient to last
                                          // positive means an amount in second 0 or negative means indefinitely until further notice
};

struct LedThreadData {
    TaskHandle_t task;
    TaskFunction_t func;
};

// buffer that will be written out to the led strip over serial
extern uint32_t g_serial_out_buffer[122];
// 120-long slice of the out buffer that represents the first few leds
extern union Led* g_leds;
extern struct Gradient g_default_gradient;
extern struct Gradient g_current_gradient;
extern int g_leds_are_default;
extern enum LedsSendStatus g_leds_send_state;
extern SemaphoreHandle_t g_led_mutex;
extern struct LedThreadData g_led_thread_data;

#define CLOCK 4
#define DATA 5

extern void send_leds();

extern void set_led_range(int start, int end, union Led value);
extern void leds_set_default_gradient(const struct Gradient* gradient);
extern void leds_set_current_gradient(const struct Gradient* gradient, int defer_send);
extern void leds_reset_gradient(int defer_send);

extern void leds_thread();
extern void leds_init();

#endif // !_leds_h