/* DeskLock — living-room face and voice for the Tatlock butler.
 *
 * Boot: display + face -> audio (gong) -> Wi-Fi (C6/ESP-Hosted) -> gateway WS.
 * Interaction (phase 2): touch-to-talk — tap to speak, tap again to finish.
 *
 * Touch is DECOUPLED from the LVGL thread: the touch callback only signals a
 * semaphore; all the real work (blocking WebSocket sends, audio, face changes)
 * runs in app_task. A blocking WS send on the LVGL render thread stalls the
 * MIPI-DSI flush -> blue/garbage frame + task-watchdog reboot.
 */

#include "esp_log.h"
#include "esp_system.h"
#include "freertos/FreeRTOS.h"
#include "freertos/semphr.h"
#include "freertos/task.h"
#include "bsp/esp-bsp.h"

#include "desklock.h"

/* 1 = L1 wifi driver diagnosis (SoftAP, no STA/gateway). 0 = normal app. */
#define WIFI_DIAG_MODE 0

static const char *TAG = "desklock";

static SemaphoreHandle_t s_touch_sem;
static bool s_talking;

/* Called from the LVGL touch callback — MUST be fast and non-blocking. */
void app_on_touch(void)
{
    if (s_touch_sem != NULL) {
        xSemaphoreGive(s_touch_sem);
    }
}

/* Called from the WS event task when the link drops: forget any half-utterance
 * so the next tap starts a fresh one instead of hitting the "stop" branch. */
void app_on_disconnect(void)
{
    s_talking = false;
}

/* Runs in app_task (normal context): blocking sends here don't stall rendering. */
static void handle_touch(void)
{
    face_activity();

    if (!gw_connected()) {
        s_talking = false; /* link gone; nothing to talk to */
        return;
    }
    if (!s_talking) {
        if (audio_is_playing() || face_get() == FACE_EFFORT) {
            return; /* barge-in is phase 4 */
        }
        s_talking = true;
        gw_send_text("{\"type\":\"utterance_start\"}");
        audio_capture_start();
        face_set(FACE_LISTENING);
        ESP_LOGI(TAG, "listening…");
    } else {
        s_talking = false;
        audio_capture_stop();
        gw_send_text("{\"type\":\"utterance_end\"}");
        face_set(FACE_PENSIVE);
        ESP_LOGI(TAG, "utterance sent");
    }
}

static void app_task(void *arg)
{
    (void)arg;
    for (;;) {
        if (xSemaphoreTake(s_touch_sem, portMAX_DELAY) == pdTRUE) {
            vTaskDelay(pdMS_TO_TICKS(60));   /* debounce */
            xSemaphoreTake(s_touch_sem, 0);  /* coalesce repeats during debounce */
            handle_touch();
        }
    }
}

void app_on_playback_done(void)
{
    face_set(FACE_IDLE);
}

void app_main(void)
{
    ESP_LOGI(TAG, "DeskLock starting");

    s_touch_sem = xSemaphoreCreateBinary();

    bsp_display_start();
    bsp_display_backlight_on();
    face_init();

    audio_init();
    if (esp_reset_reason() == ESP_RST_POWERON) {
        audio_play_gong(); /* cold boot only — recovery reboots stay silent */
    }

    xTaskCreate(app_task, "app", 4096, NULL, 5, NULL);

#if WIFI_DIAG_MODE
    wifi_diag_start();
#else
    net_start();
    c6_ota_start(); /* one-shot C6 radio firmware update — remove once proven */
#endif

    ESP_LOGI(TAG, "DeskLock up");
}