/* test/test_decode.c — 播放解码链路验证（宿主）：minimp3 解码 mp3 → audio_out(FILE sink) 写 WAV。
 * 不依赖网络/登录（输入本地 mp3）。验证：解码无错、WAV 非空、时长合理、RT 因子。
 * 运行：NCM_AUDIO_SINK=file NCM_AUDIO_OUT=/tmp/ncm_decode.wav ./test_decode <path.mp3>
 */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include "../ncm_app_internal.h"   /* 引 audio_out / minimp3 声明 */
#include "minimp3_ex.h"

ncm_app_state_t g_st;
ncm_play_run_t  g_play = { .mu = PTHREAD_MUTEX_INITIALIZER };
volatile int g_app_quit = 0;
volatile int g_net_ready = 0;
int          g_host_mock = 1;

static double now_s(void)
{
    struct timespec ts;
    clock_gettime(CLOCK_MONOTONIC, &ts);
    return (double)ts.tv_sec + ts.tv_nsec / 1e9;
}

int main(int argc, char **argv)
{
    const char *path = (argc > 1) ? argv[1] : "vendor/minimp3/vectors/performance/MIPSTest.mp3";
    mp3dec_ex_t dec;
    memset(&dec, 0, sizeof dec);
    if (mp3dec_ex_open(&dec, path, MP3D_SEEK_TO_BYTE) != 0) { fprintf(stderr, "open failed\n"); return 1; }

    static mp3d_sample_t pcm[8192 * 2];
    /* 读首帧确定采样率/声道（read 会填 dec.info）*/
    size_t got = mp3dec_ex_read(&dec, pcm, 8192 * 2);
    int sr = dec.info.hz;
    int ch = dec.info.channels;
    if (sr <= 0 || ch <= 0) { fprintf(stderr, "bad stream\n"); return 1; }
    printf("mp3: %s  %dHz x%d  detected_samples=%lld  bitrate=%dkbps\n",
           path, sr, ch, (long long)dec.samples, dec.info.bitrate_kbps);
    if (audio_out_open(sr, ch, 16) != 0) { fprintf(stderr, "audio_out open failed\n"); return 1; }

    long long frames = 0;
    double t0 = now_s();
    if (got > 0) {
        int fr = (int)(got / (size_t)ch);
        if (audio_out_write(pcm, fr) != fr) { fprintf(stderr, "write failed\n"); return 1; }
        frames += fr;
    }
    for (;;) {
        if (g_app_quit) break;
        got = mp3dec_ex_read(&dec, pcm, 8192 * 2);
        if (got == 0) break;
        int fr = (int)(got / (size_t)ch);
        if (audio_out_write(pcm, fr) != fr) { fprintf(stderr, "write failed\n"); break; }
        frames += fr;
    }
    double dt = now_s() - t0;
    audio_out_close();
    mp3dec_ex_close(&dec);

    double secs = (double)frames / (double)sr;
    double rt  = (dt > 0) ? secs / dt : 0;
    printf("decoded %lld frames = %.2f s audio (%d Hz) in %.3f s => %.1fx RT\n",
           frames, secs, sr, dt, rt);
    printf("OK: %s\n", (frames > 0) ? "decode chain works" : "EMPTY");
    return (frames > 0) ? 0 : 1;
}