/* 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/queue.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";

/* All utterance framing (blocking WS sends, chime, face) runs on app_task, never
 * on the LVGL touch callback nor the AFE detect/fetch thread. The wake word, VAD,
 * and touch just POST an event; app_task is the single serializer of start/end,
 * which removes both the fetch-thread stall and the double-start race. */
typedef enum { EV_TOUCH, EV_WAKE, EV_SPEECH_END } app_event_t;
static QueueHandle_t s_events;

static void post_event(app_event_t ev)
{
    if (s_events != NULL) {
        xQueueSend(s_events, &ev, 0);
    }
}

/* --- these three are the fast, non-blocking hooks called from other tasks --- */
void app_on_touch(void) { post_event(EV_TOUCH); }        /* LVGL touch callback */
void app_on_wake(void) { post_event(EV_WAKE); }          /* AFE detect_task: wake word */
void app_on_speech_end(void) { post_event(EV_SPEECH_END); } /* AFE detect_task: VAD silence */

/* --- the actual work, all on app_task --- */
static void start_utterance(void)
{
    if (!gw_connected() || audio_is_playing() || audio_capture_active()
            || face_get() == FACE_EFFORT) {
        return;
    }
    face_activity();
    audio_play_chime();                              /* audible "I heard you" */
    gw_send_text("{\"type\":\"utterance_start\"}");   /* must precede any audio frames */
    audio_capture_start();                           /* now detect_task forwards audio */
    face_set(FACE_LISTENING);
    ESP_LOGI(TAG, "listening…");
}

static void end_utterance(void)
{
    if (!audio_capture_active()) {
        return;
    }
    audio_capture_stop();
    gw_send_text("{\"type\":\"utterance_end\"}");
    face_set(FACE_PENSIVE);
    ESP_LOGI(TAG, "utterance sent");
}

/* WS link dropped: abandon any half-utterance so the next wake starts fresh. */
void app_on_disconnect(void)
{
    audio_capture_stop();
}

static void app_task(void *arg)
{
    (void)arg;
    app_event_t ev;
    for (;;) {
        if (xQueueReceive(s_events, &ev, portMAX_DELAY) != pdTRUE) {
            continue;
        }
        if (ev == EV_TOUCH) {
            vTaskDelay(pdMS_TO_TICKS(60));       /* debounce */
            xQueueReset(s_events);               /* coalesce a bouncy tap burst */
            face_activity();
            if (!gw_connected()) {
                audio_capture_stop();
            } else if (!audio_capture_active()) {
                start_utterance();               /* tap = manual wake */
            } else {
                end_utterance();                 /* tap = manual end */
            }
        } else if (ev == EV_WAKE) {
            start_utterance();
        } else if (ev == EV_SPEECH_END) {
            end_utterance();
        }
    }
}

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

#if SDIO_TX_SELFTEST
/* Temporary autonomous SDIO-TX stress test: stream mic audio upstream for 40s
 * right after connecting (no user tap needed) to prove the #167 alignment fix.
 * Remove once verified. */
static void sdio_tx_selftest_task(void *arg)
{
    (void)arg;
    vTaskDelay(pdMS_TO_TICKS(4000));
    ESP_LOGW("selftest", "SDIO TX STRESS START: streaming mic audio 40s");
    audio_capture_start();
    for (int i = 0; i < 40; i++) {
        vTaskDelay(pdMS_TO_TICKS(1000));
        ESP_LOGW("selftest", "SDIO TX STRESS: alive %ds (no wedge)", i + 1);
    }
    audio_capture_stop();
    ESP_LOGW("selftest", "SDIO TX STRESS SURVIVED 40s — #167 FIX CONFIRMED");
    vTaskDelete(NULL);
}

void sdio_tx_selftest_kick(void)
{
    static bool started;
    if (!started) {
        started = true;
        xTaskCreate(sdio_tx_selftest_task, "sdiotest", 4096, NULL, 4, NULL);
    }
}
#endif

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

    s_events = xQueueCreate(8, sizeof(app_event_t));

    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");
}