/*
 * status_led.c
 *
 * Copyright (c) 2025 Umber Networks & Robert McMahon
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice,
 * this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
 * documentation and/or other materials provided with the distribution.
 *
 * 3. Neither the name of the copyright holder nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include "status_led.h"
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "driver/gpio.h"
#include "led_strip.h"
#include "esp_log.h"

static const char *TAG = "status_led";

static led_strip_handle_t s_led_strip = NULL;
static bool s_is_rgb = false;
static int s_gpio_pin = -1;
static volatile led_state_t s_current_state = LED_STATE_NO_CONFIG;

// Helper to set color safely
static void set_color(uint8_t r, uint8_t g, uint8_t b) {
    if (s_is_rgb && s_led_strip) {
        led_strip_set_pixel(s_led_strip, 0, r, g, b);
        led_strip_refresh(s_led_strip);
    } else if (!s_is_rgb && s_gpio_pin >= 0) {
        // Simple LED logic: If any color is requested, turn ON.
        // NOTE: If your LED is active-low (VCC->LED->Pin), invert this to !((r+g+b)>0)
        gpio_set_level(s_gpio_pin, (r + g + b) > 0 ? 1 : 0);
    }
}

static void led_task(void *arg) {
    int toggle = 0;

    // --- Startup Diagnostic Sequence ---
    // Cycle R -> G -> B to prove hardware is working
    ESP_LOGW(TAG, "Running LED Diagnostic Sequence on GPIO %d...", s_gpio_pin);
    set_color(50, 0, 0); // Red
    vTaskDelay(pdMS_TO_TICKS(300));
    set_color(0, 50, 0); // Green
    vTaskDelay(pdMS_TO_TICKS(300));
    set_color(0, 0, 50); // Blue
    vTaskDelay(pdMS_TO_TICKS(300));
    set_color(0, 0, 0);  // Off
    vTaskDelay(pdMS_TO_TICKS(100));

    while (1) {
        // Brightness set to 30-50 (out of 255) for visibility
        switch (s_current_state) {
            case LED_STATE_NO_CONFIG: // Yellow (Solid RGB / Blink Simple)
                if (s_is_rgb) {
                    set_color(40, 30, 0);
                    vTaskDelay(pdMS_TO_TICKS(1000));
                } else {
                    set_color(1,1,1); vTaskDelay(pdMS_TO_TICKS(100));
                    set_color(0,0,0); vTaskDelay(pdMS_TO_TICKS(100));
                }
                break;
            case LED_STATE_WAITING: // Blue Blink
                set_color(0, 0, toggle ? 50 : 0);
                toggle = !toggle;
                vTaskDelay(pdMS_TO_TICKS(500));
                break;
            case LED_STATE_CONNECTED: // Green Solid
                set_color(0, 30, 0);
                vTaskDelay(pdMS_TO_TICKS(1000));
                break;
            case LED_STATE_MONITORING: // Cyan Solid
                set_color(0, 30, 30);
                vTaskDelay(pdMS_TO_TICKS(1000));
                break;
            case LED_STATE_TRANSMITTING: // Purple Fast Flash
                set_color(toggle ? 40 : 0, 0, toggle ? 40 : 0);
                toggle = !toggle;
                vTaskDelay(pdMS_TO_TICKS(100));
                break;
            case LED_STATE_TRANSMITTING_SLOW: // Purple Slow Pulse
                set_color(toggle ? 40 : 0, 0, toggle ? 40 : 0);
                toggle = !toggle;
                vTaskDelay(pdMS_TO_TICKS(500));
                break;
            case LED_STATE_STALLED: // Red/Purple Solid
                set_color(50, 0, 20);
                vTaskDelay(pdMS_TO_TICKS(1000));
                break;
            case LED_STATE_FAILED: // Red Blink
                set_color(toggle ? 50 : 0, 0, 0);
                toggle = !toggle;
                vTaskDelay(pdMS_TO_TICKS(200));
                break;
            default:
                vTaskDelay(pdMS_TO_TICKS(100));
                break;
        }
    }
}

void status_led_init(int gpio_pin, bool is_rgb_strip) {
    s_gpio_pin = gpio_pin;
    s_is_rgb = is_rgb_strip;

    ESP_LOGI(TAG, "Initializing Status LED: GPIO=%d, Type=%s",
             gpio_pin, is_rgb_strip ? "RGB Strip (WS2812)" : "Simple GPIO");

    if (s_is_rgb) {
        led_strip_config_t s_cfg = {
            .strip_gpio_num = gpio_pin,
            .max_leds = 1,
            .led_pixel_format = LED_PIXEL_FORMAT_GRB,
            .led_model = LED_MODEL_WS2812,
            .flags.invert_out = false,
        };
        led_strip_rmt_config_t r_cfg = {
            .resolution_hz = 10 * 1000 * 1000,
            .flags.with_dma = false,
        };

        esp_err_t ret = led_strip_new_rmt_device(&s_cfg, &r_cfg, &s_led_strip);
        if (ret != ESP_OK) {
            ESP_LOGE(TAG, "Failed to create RMT LED strip: %s", esp_err_to_name(ret));
            return;
        }
        led_strip_clear(s_led_strip);
    } else {
        gpio_reset_pin(gpio_pin);
        gpio_set_direction(gpio_pin, GPIO_MODE_OUTPUT);
        gpio_set_level(gpio_pin, 0);
    }

    xTaskCreate(led_task, "led_task", 2048, NULL, 5, NULL);
}

void status_led_set_state(led_state_t state) {
    s_current_state = state;
}

led_state_t status_led_get_state(void) {
    return s_current_state;
}