#include "camera.h"

#include "common/processing.h"
#include "common/properties.h"

#define FF_TERMUX_API_PATH FASTFETCH_TARGET_DIR_ROOT "/libexec/termux-api"
#define FF_TERMUX_API_PARAM "CameraInfo"

static inline void wrapYyjsonFree(yyjson_doc** doc) {
    assert(doc);
    if (*doc) {
        yyjson_doc_free(*doc);
    }
}

const char* ffDetectCamera(FF_A_UNUSED FFlist* result) {
    FF_STRBUF_AUTO_DESTROY buffer = ffStrbufCreate();

    if (ffProcessAppendStdOut(&buffer, (char* const[]) { FF_TERMUX_API_PATH, FF_TERMUX_API_PARAM, NULL })) {
        return "Starting `" FF_TERMUX_API_PATH " " FF_TERMUX_API_PARAM "` failed";
    }

    yyjson_doc* FF_A_CLEANUP(wrapYyjsonFree) doc = yyjson_read_opts(buffer.chars, buffer.length, 0, NULL, NULL);
    if (!doc) {
        return "Failed to parse camera info";
    }

    yyjson_val* root = yyjson_doc_get_root(doc);
    if (!yyjson_is_arr(root)) {
        return "Camera info result is not a JSON array";
    }

    yyjson_val* device;
    size_t idx, max;
    yyjson_arr_foreach (root, idx, max, device) {
        FFCameraResult* camera = FF_LIST_ADD(FFCameraResult, *result);
        {
            const char* facing = yyjson_get_str(yyjson_obj_get(device, "facing"));
            if (facing) {
                ffStrbufInitF(&camera->name, "builtin-%s", facing);
            } else {
                ffStrbufInitStatic(&camera->name, "Unknown");
            }
        }
        ffStrbufInit(&camera->vendor);
        ffStrbufInitJsonVal(&camera->id, yyjson_obj_get(device, "id"));
        yyjson_val* sizes = yyjson_arr_get_first(yyjson_obj_get(device, "jpeg_output_sizes"));
        if (yyjson_is_obj(sizes)) {
            camera->width = (uint32_t) yyjson_get_uint(yyjson_obj_get(sizes, "width"));
            camera->height = (uint32_t) yyjson_get_uint(yyjson_obj_get(sizes, "height"));
        } else {
            camera->width = camera->height = 0;
        }
        ffStrbufInit(&camera->colorspace);
    }

    return NULL;
}
