#include "wav.h"
#include "channel.h"
#include <stdio.h>
#include <stdlib.h>
#include <sndfile.h>

int wav_read(const char *path, float **buffer, unsigned *frames) {
    SF_INFO info;
    info.format = 0;
    SNDFILE *sf = sf_open(path, SFM_READ, &info);
    if (!sf) return -1;

    /* We need mono 16-bit PCM; refuse anything else */
    if (info.channels != 1 || info.samplerate <= 0) {
        sf_close(sf);
        return -1;
    }

    unsigned total = (info.frames > (sf_count_t)LOOP_BUF_SIZE) ? LOOP_BUF_SIZE : (unsigned)info.frames;
    float *buf = (float*)malloc(total * sizeof(float));
    if (!buf) { sf_close(sf); return -1; }

    sf_count_t nread = sf_readf_float(sf, buf, total);
    sf_close(sf);
    *buffer = buf;
    *frames = (unsigned)nread;
    return 0;
}

int wav_write(const char *path, const float *data, unsigned frames, unsigned sample_rate) {
    SF_INFO info;
    info.samplerate = sample_rate;
    info.channels = 1;
    info.format = SF_FORMAT_WAV | SF_FORMAT_PCM_16;
    SNDFILE *sf = sf_open(path, SFM_WRITE, &info);
    if (!sf) return -1;

    sf_writef_float(sf, data, frames);
    sf_close(sf);
    return 0;
}