/* FreeRTOS */
#include "FreeRTOS.h"
#include "semphr.h"
#include "task.h"

/* LVGL */
#include "lv_demos.h"
#include "lvgl.h"

/* App */
#include "app_impl_lcd.h"
#include "app_lvgl.h"

#define APP_LVGL_WIDTH  (360)
#define APP_LVGL_HEIGHT (360)

static SemaphoreHandle_t s_lvgl_semphr = NULL;

static uint16_t s_lcd_buffer[APP_LVGL_WIDTH * 10];

static uint32_t app_lvgl_get_tick_cb(void);
static void     app_lvgl_lcd_flush_cb(lv_display_t *disp, const lv_area_t *area, uint8_t *px_map);
static void     app_lvgl_task(void *arguments);

int app_lvgl_init(void) {
    s_lvgl_semphr = xSemaphoreCreateBinary();
    if (s_lvgl_semphr == NULL) {
        return -1;
    }

    xSemaphoreGive(s_lvgl_semphr);

    app_lcd_impl_init(NULL);

    lv_init();

    lv_tick_set_cb(app_lvgl_get_tick_cb);

    uint16_t hor_res = APP_LVGL_WIDTH;
    uint16_t ver_res = APP_LVGL_HEIGHT;

    lv_display_t *display = lv_display_create(hor_res, ver_res);
    if (display == NULL) {
        goto deinit_lv_exit;
    }

    lv_display_set_flush_cb(display, app_lvgl_lcd_flush_cb);
    lv_display_set_buffers(display, s_lcd_buffer, NULL, sizeof(s_lcd_buffer), LV_DISPLAY_RENDER_MODE_PARTIAL);

    lv_demo_widgets();

    if (xTaskCreate(app_lvgl_task, "LVGL", 2048, NULL, 3, NULL) != pdPASS) {
        goto destroy_display_exit;
    }

    return 0;

destroy_display_exit:
    lv_display_delete(display);

deinit_lv_exit:
    lv_deinit();
    vSemaphoreDelete(s_lvgl_semphr);

    return -1;
}

bool app_lvgl_lock(uint32_t timeout_ms) {
    if (xSemaphoreTake(s_lvgl_semphr, pdMS_TO_TICKS(timeout_ms)) != pdPASS) {
        return false;
    }

    return true;
}

void app_lvgl_unlock(void) {
    xSemaphoreGive(s_lvgl_semphr);
}

static uint32_t app_lvgl_get_tick_cb(void) {
    return xTaskGetTickCount();
}

static void app_lvgl_lcd_flush_cb(lv_display_t *disp, const lv_area_t *area, uint8_t *px_map) {
    lv_display_flush_ready(disp);
}

static void app_lvgl_task(void *arguments) {
    for (;;) {
        if (app_lvgl_lock(portMAX_DELAY)) {
            lv_task_handler();
            app_lvgl_unlock();
        }

        vTaskDelay(pdMS_TO_TICKS(5));
    }
}