// Emits the exact bytes hyperion.c would put on the wire, so the FlatBuffers
// encoding can be checked against the reference implementation.
//
//   ./fb_dump register out.bin
//   ./fb_dump image out.bin
#include "../native/src/net/hyperion.h"

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

int main(int argc, char** argv)
{
    if (argc < 3) {
        fprintf(stderr, "usage: %s <register|image> <output-file>\n", argv[0]);
        return 2;
    }

    size_t len = 0;
    uint8_t* buf = NULL;

    if (strcmp(argv[1], "register") == 0) {
        buf = hyperion_build_register("lgtv-audio-cap", 150, &len);
    } else if (strcmp(argv[1], "image") == 0) {
        // 4x2 RGB gradient: distinctive enough that a wrong vector offset or
        // a swapped width/height shows up immediately.
        const int w = 4, h = 2;
        uint8_t rgb[4 * 2 * 3];
        for (int i = 0; i < w * h; i++) {
            rgb[i * 3 + 0] = (uint8_t)(i * 10);
            rgb[i * 3 + 1] = (uint8_t)(i * 10 + 1);
            rgb[i * 3 + 2] = (uint8_t)(i * 10 + 2);
        }
        buf = hyperion_build_image(rgb, w, h, &len);
    } else {
        fprintf(stderr, "unknown message '%s'\n", argv[1]);
        return 2;
    }

    if (!buf) {
        fprintf(stderr, "build failed\n");
        return 1;
    }

    FILE* f = fopen(argv[2], "wb");
    if (!f) {
        perror("fopen");
        free(buf);
        return 1;
    }
    fwrite(buf, 1, len, f);
    fclose(f);
    free(buf);

    fprintf(stderr, "wrote %zu bytes to %s\n", len, argv[2]);
    return 0;
}