/* Виртуальное устройство сохраняет уже поставленные темпы: проверка догона и истории без реального времени. */
#include <stdlib.h>
#include <string.h>

#include "../src/stream/stream_playback_clock.h"
#include "../lib/debug_config.h"

#define CHECK(x) do { if (!(x)) { DEBUG_ERROR(DEBUG_CATEGORY_STREAM, "playback test line=%d: %s", __LINE__, #x); exit(1); } } while (0)

static void test_history_correction(void) {
    struct stream_playback_clock clock; struct stream_playback_state state;
    stream_playback_clock_reset(&clock, 1);
    CHECK(!stream_playback_clock_update(&clock, 0, 0, 120000, 20000, 0, 0, &state));
    CHECK(!stream_playback_clock_update(&clock, 1000000, 1000000, 1300000, 20000, 0, 0, &state));
    CHECK(state.minimum_us == 120000 && state.correction_us == 0);
    CHECK(!stream_playback_clock_update(&clock, 1080000, 1000000, 1300000, 20000, 0, 1, &state));
    CHECK(state.minimum_us == 200000 && state.correction_us == 80000 && state.waiting);
    CHECK(!stream_playback_clock_update(&clock, 1090000, 1010000, 1310000, 20000, 0, 0, &state));
    CHECK(!state.waiting && state.tempo_milli == 1000);
    CHECK(!stream_playback_clock_update(&clock, 2090000, 2110000, 2410000, 20000, 0, 0, &state));
    CHECK(state.minimum_us == 100000 && state.correction_us == -20000);
    DEBUG_INFO(DEBUG_CATEGORY_STREAM, "[PASS] history: pause shifts all minima +80ms, actual x1.1 shifts -100ms");
}

static void test_catchup_device_queue(void) {
    struct stream_playback_clock clock; struct stream_playback_state state;
    stream_playback_clock_reset(&clock, 2);
    int queued[100]; for (unsigned i = 0; i < 100; i++) queued[i] = 1000;
    int64_t position = 0;
    int accelerated = 0, maximum = 1000;
    for (int64_t tick = 0; tick <= 120000; tick++) {
        unsigned slot = (unsigned)(tick % 100);
        if (tick) position += queued[slot];
        int64_t pending_gain = 0;
        for (unsigned i = 0; i < 100; i++) pending_gain += queued[i] - 1000;
        CHECK(!stream_playback_clock_update(&clock, tick * 1000, position, tick * 1000 + 300000,
                                            30000, pending_gain, 0, &state));
        CHECK(state.tempo_milli >= 1000 && state.tempo_milli <= 1100);
        if (tick < 60000) CHECK(state.tempo_milli == 1000);
        if (state.tempo_milli > 1000) accelerated = 1;
        if (state.tempo_milli > maximum) maximum = state.tempo_milli;
        CHECK(state.minimum_us >= 29000);
        queued[slot] = state.tempo_milli;
    }
    CHECK(accelerated && maximum == 1100 && state.history_ready);
    CHECK(state.reserve_us >= 29000 && state.reserve_us < 33000 && state.tempo_milli == 1000);
    /* Короткая остановка, попавшая между секундными отсчётами, блокирует догон на полную минуту. */
    int64_t now = 120000000;
    CHECK(!stream_playback_clock_update(&clock, now + 10000, position, position, 30000, 0, 1, &state));
    CHECK(!stream_playback_clock_update(&clock, now + 20000, position, position + 500000, 30000, 0, 0, &state));
    for (int64_t tick = 1; tick < 60000; tick++) {
        CHECK(!stream_playback_clock_update(&clock, now + 20000 + tick * 1000, position + tick * 1000,
                                            position + tick * 1000 + 500000, 30000, 0, 0, &state));
        CHECK(state.tempo_milli == 1000);
    }
    DEBUG_INFO(DEBUG_CATEGORY_STREAM, "[PASS] catchup: healthy minute, smooth x1.1, queued audio, safe residual and pause cooldown");
}

static void test_invalid_and_sampling_gap(void) {
    struct stream_playback_clock clock; struct stream_playback_state state, before;
    stream_playback_clock_reset(&clock, 3); memset(&state, 0xa5, sizeof(state)); before = state;
    CHECK(stream_playback_clock_update(&clock, -1, 0, 0, 0, 0, 0, &state) < 0 && !memcmp(&state, &before, sizeof(state)));
    CHECK(!stream_playback_clock_update(&clock, 0, 0, 200000, 20000, 0, 0, &state));
    CHECK(!stream_playback_clock_update(&clock, 2000000, 2000000, 2200000, 20000, 0, 0, &state));
    CHECK(!state.stable_us && state.tempo_milli == 1000 && !state.history_ready);
    before = state;
    CHECK(stream_playback_clock_update(&clock, 2000001, 1000000, 2200000, 20000, 0, 0, &state) < 0);
    CHECK(!memcmp(&state, &before, sizeof(state)));
    DEBUG_INFO(DEBUG_CATEGORY_STREAM, "[PASS] clock: invalid/backward positions preserve result, missed samples reset healthy minute");
}

int main(void) {
    debug_config_init(); debug_set_level(DEBUG_LEVEL_ERROR);
    debug_set_category_level(DEBUG_CATEGORY_STREAM, DEBUG_LEVEL_INFO);
    test_history_correction(); test_catchup_device_queue(); test_invalid_and_sampling_gap();
    return 0;
}