#include <stdio.h>
#include <string.h>

#include "esp_log.h"
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"

#include "ambient_weather.h"
#include "app_config.h"
#include "backlight.h"
#include "display_rgb.h"
#include "i2c_bus.h"
#include "lvgl_port.h"
#include "touch_gt911.h"
#include "ui_manager.h"
#include "wifi_manager.h"

static const char *TAG = "main";

#define WEATHER_TASK_STACK 6144
#define WEATHER_TASK_PRIO  3
#define WEATHER_FIRST_DELAY_MS 3000

static void weather_update_task(void *arg)
{
    weather_data_t weather;
    char line[96];

    vTaskDelay(pdMS_TO_TICKS(WEATHER_FIRST_DELAY_MS));

    while (1) {
        if (!wifi_is_connected()) {
            ui_set_status("WiFi: reconnecting...");
            vTaskDelay(pdMS_TO_TICKS(WEATHER_UPDATE_INTERVAL_MS));
            continue;
        }

        /*
         * Freeze rendering for the duration of the fetch. The TLS session,
         * the LVGL redraw and the flush into the PSRAM framebuffer all
         * compete with the LCD's own DMA out of that same PSRAM; letting them
         * overlap is what produces visible artefacts. The panel keeps
         * scanning the last completed frame, so the screen simply holds still.
         */
        lvgl_port_pause();
        const esp_err_t err = weather_update(&weather);
        lvgl_port_resume();

        if (err == ESP_OK) {
            weather_get_string(&weather, line, sizeof(line));
            ESP_LOGI(TAG, "Weather: %s", line);

            char detail[64];
            snprintf(detail, sizeof(detail), "%.0f%% humidity",
                     weather.has_humidity ? weather.humidity : 0.0f);

            ui_update_weather((int16_t)(weather.temp_f + 0.5f),
                              weather.has_humidity ? detail : "Outdoor");

            wifi_get_status(line, sizeof(line));
            ui_set_status(line);
        } else {
            ESP_LOGW(TAG, "Weather update failed");
            ui_set_status("Weather update failed");
        }

        vTaskDelay(pdMS_TO_TICKS(WEATHER_UPDATE_INTERVAL_MS));
    }
}

void app_main(void)
{
    ESP_LOGI(TAG, "Thermostat HMI -- CrowPanel 7.0\" ESP32-S3 (800x480)");

    /*
     * WiFi comes up FIRST, before the RGB panel exists.
     *
     * The panel's bounce-buffer ISR reads the framebuffer out of PSRAM, and
     * PSRAM shares the cache with flash on the ESP32-S3. Bringing up NVS and
     * the WiFi PHY writes calibration data to flash, which disables the cache
     * and faults that ISR. Doing it here means every flash write is finished
     * before the panel starts scanning.
     */
    const esp_err_t wifi_err = wifi_init_sta();
    if (wifi_err != ESP_OK) {
        ESP_LOGE(TAG, "WiFi failed -- continuing, weather will be disabled");
    }

    /* LVGL core must exist before the display and touch drivers register
     * themselves with it. */
    ESP_ERROR_CHECK(lvgl_port_init());

    /* Shared bus: STC8H1K28 board controller and GT911 both live on it. */
    ESP_ERROR_CHECK(i2c_bus_init());

    /* Must precede touch_init(): the STC8H1K28 holds the GT911 in reset
     * until its init sequence runs. */
    if (backlight_init() != ESP_OK) {
        ESP_LOGE(TAG, "STC8H1K28 init failed -- backlight and touch will not work");
    }
    i2c_bus_scan(TAG);

    ESP_ERROR_CHECK(display_init());

    if (touch_init() != ESP_OK) {
        /* A dead touch panel should not stop the display from working. */
        ESP_LOGW(TAG, "Touch unavailable -- continuing without input");
    }

    ui_init();
    ESP_ERROR_CHECK(lvgl_port_start());

    /* First frame is rendered by now, so it is safe to light the panel. */
    vTaskDelay(pdMS_TO_TICKS(100));
    ESP_ERROR_CHECK(backlight_set(255));

    if (wifi_err != ESP_OK) {
        ui_set_status("WiFi: failed");
        return;
    }

    char status[96];
    wifi_get_status(status, sizeof(status));
    ui_set_status(status);

    if (weather_init() != ESP_OK) {
        ui_set_status("Weather: no API credentials");
        return;
    }

    xTaskCreate(weather_update_task, "weather", WEATHER_TASK_STACK, NULL,
                WEATHER_TASK_PRIO, NULL);

    ESP_LOGI(TAG, "System ready");
}