#include "nerv/common.h"
#include "kaldi_mpe.h"
#include <stdio.h>

const char *nerv_kaldi_mpe_tname = "nerv.KaldiMPE";
const char *nerv_matrix_cuda_float_tname = "nerv.CuMatrixFloat";
const char *nerv_matrix_host_float_tname = "nerv.MMatrixFloat";

static int mpe_new(lua_State *L) {
    const char *arg = luaL_checkstring(L, 1);
    const char *mdl = luaL_checkstring(L, 2);
    const char *lat = luaL_checkstring(L, 3);
    const char *ali = luaL_checkstring(L, 4);
    KaldiMPE *mpe = new_KaldiMPE(arg, mdl, lat, ali);
    luaT_pushudata(L, mpe, nerv_kaldi_mpe_tname);
    return 1;
}

static int mpe_destroy(lua_State *L) {
    KaldiMPE *mpe = luaT_checkudata(L, 1, nerv_kaldi_mpe_tname);
    destroy_KaldiMPE(mpe);
    return 0;
}

static int mpe_check(lua_State *L) {
    KaldiMPE *mpe = luaT_checkudata(L, 1, nerv_kaldi_mpe_tname);
    const Matrix *cumat = luaT_checkudata(L, 2, nerv_matrix_cuda_float_tname);
    const char *utt = luaL_checkstring(L, 3);

    lua_pushboolean(L, check_mpe(mpe, cumat, utt));
    return 1;
}

static int mpe_calc_diff(lua_State *L) {
    KaldiMPE *mpe = luaT_checkudata(L, 1, nerv_kaldi_mpe_tname);
    Matrix *mat = luaT_checkudata(L, 2, nerv_matrix_host_float_tname);
    const char *utt = luaL_checkstring(L, 3);

    Matrix *diff = calc_diff_mpe(mpe, mat, utt);
    luaT_pushudata(L, diff, nerv_matrix_host_float_tname);
    return 1;
}

static int mpe_get_num_frames(lua_State *L) {
    KaldiMPE *mpe = luaT_checkudata(L, 1, nerv_kaldi_mpe_tname);
    lua_pushnumber(L, get_num_frames_mpe(mpe));
    return 1;
}

static int mpe_get_utt_frame_acc(lua_State *L) {
    KaldiMPE *mpe = luaT_checkudata(L, 1, nerv_kaldi_mpe_tname);
    lua_pushnumber(L, get_utt_frame_acc_mpe(mpe));
    return 1;
}

static const luaL_Reg mpe_methods[] = {
    {"check", mpe_check},
    {"calc_diff", mpe_calc_diff},
    {"get_num_frames", mpe_get_num_frames},
    {"get_utt_frame_acc", mpe_get_utt_frame_acc},
    {NULL, NULL}
};

static void mpe_init(lua_State *L) {
    luaT_newmetatable(L, nerv_kaldi_mpe_tname, NULL,
                        mpe_new, mpe_destroy, NULL);
    luaL_register(L, NULL, mpe_methods);
    lua_pop(L, 1);
}

void kaldi_seq_init(lua_State *L) {
    mpe_init(L);
}