#!/usr/bin/python3
# -*- coding: utf-8 -*-
from enum import Enum
from functools import lru_cache
import logging
import os
import platform
from pathlib import Path

import huggingface_hub
import sherpa
import sherpa_onnx

main_logger = logging.getLogger("main")


class EnumDecodingMethod(Enum):
    greedy_search = "greedy_search"
    modified_beam_search = "modified_beam_search"


model_map = {
    "Chinese": [
        {
            "repo_id": "csukuangfj/wenet-chinese-model",
            "nn_model_file": "final.zip",
            "nn_model_file_sub_folder": ".",
            "tokens_file": "units.txt",
            "tokens_file_sub_folder": ".",
            "normalize_samples": False,
            "loader": "load_sherpa_offline_recognizer",
        },
        {
            "repo_id": "csukuangfj/sherpa-onnx-paraformer-zh-2024-03-09",
            "nn_model_file": "model.int8.onnx",
            "nn_model_file_sub_folder": ".",
            "tokens_file": "tokens.txt",
            "tokens_file_sub_folder": ".",
            "loader": "load_sherpa_offline_recognizer_from_paraformer",
        },
        {
            "repo_id": "csukuangfj/sherpa-onnx-paraformer-zh-small-2024-03-09",
            "nn_model_file": "model.int8.onnx",
            "nn_model_file_sub_folder": ".",
            "tokens_file": "tokens.txt",
            "tokens_file_sub_folder": ".",
            "loader": "load_sherpa_offline_recognizer_from_paraformer",
        },
        {
            "repo_id": "luomingshuang/icefall_asr_wenetspeech_pruned_transducer_stateless2",
            "nn_model_file": "cpu_jit_epoch_10_avg_2_torch_1.7.1.pt",
            "nn_model_file_sub_folder": "exp",
            "tokens_file": "tokens.txt",
            "tokens_file_sub_folder": "data/lang_char",
            "normalize_samples": True,
            "loader": "load_sherpa_offline_recognizer",
        },
        {
            "repo_id": "zrjin/sherpa-onnx-zipformer-multi-zh-hans-2023-9-2",
            "encoder_model_file": "encoder-epoch-20-avg-1.onnx",
            "encoder_model_file_sub_folder": ".",
            "decoder_model_file": "decoder-epoch-20-avg-1.onnx",
            "decoder_model_file_sub_folder": ".",
            "joiner_model_file": "joiner-epoch-20-avg-1.onnx",
            "joiner_model_file_sub_folder": ".",
            "tokens_file": "tokens.txt",
            "tokens_file_sub_folder": ".",
            "loader": "load_sherpa_offline_recognizer_from_transducer",
        },
    ],
    "English": [
        {
            "repo_id": "csukuangfj/sherpa-onnx-paraformer-en-2024-03-09",
            "nn_model_file": "model.int8.onnx",
            "nn_model_file_sub_folder": ".",
            "tokens_file": "tokens.txt",
            "tokens_file_sub_folder": ".",
            "loader": "load_sherpa_offline_recognizer_from_paraformer",
        },
    ],
    "Chinese+English": [
        {
            "repo_id": "csukuangfj/sherpa-onnx-paraformer-zh-2023-03-28",
            "nn_model_file": "model.int8.onnx",
            "nn_model_file_sub_folder": ".",
            "tokens_file": "tokens.txt",
            "tokens_file_sub_folder": ".",
            "loader": "load_sherpa_offline_recognizer_from_paraformer",
        },
    ],
    "Chinese+Cantonese+English": [
        {
            "repo_id": "csukuangfj/sherpa-onnx-paraformer-trilingual-zh-cantonese-en",
            "nn_model_file": "model.int8.onnx",
            "nn_model_file_sub_folder": ".",
            "tokens_file": "tokens.txt",
            "tokens_file_sub_folder": ".",
            "loader": "load_sherpa_offline_recognizer_from_paraformer",
        },
    ]
}


def download_model(local_model_dir: str,
                   **kwargs,
                   ):
    repo_id = kwargs["repo_id"]

    if "nn_model_file" in kwargs.keys():
        main_logger.info("download nn_model_file. filename: {}, subfolder: {}".format(kwargs["nn_model_file"], kwargs["nn_model_file_sub_folder"]))
        _ = huggingface_hub.hf_hub_download(
            repo_id=repo_id,
            filename=kwargs["nn_model_file"],
            subfolder=kwargs["nn_model_file_sub_folder"],
            local_dir=local_model_dir,
        )

    if "encoder_model_file" in kwargs.keys():
        main_logger.info("download encoder_model_file. filename: {}, subfolder: {}".format(kwargs["encoder_model_file"], kwargs["encoder_model_file_sub_folder"]))
        _ = huggingface_hub.hf_hub_download(
            repo_id=repo_id,
            filename=kwargs["encoder_model_file"],
            subfolder=kwargs["encoder_model_file_sub_folder"],
            local_dir=local_model_dir,
        )

    if "decoder_model_file" in kwargs.keys():
        main_logger.info("download decoder_model_file. filename: {}, subfolder: {}".format(kwargs["decoder_model_file"], kwargs["decoder_model_file_sub_folder"]))
        _ = huggingface_hub.hf_hub_download(
            repo_id=repo_id,
            filename=kwargs["decoder_model_file"],
            subfolder=kwargs["decoder_model_file_sub_folder"],
            local_dir=local_model_dir,
        )

    if "joiner_model_file" in kwargs.keys():
        main_logger.info("download joiner_model_file. filename: {}, subfolder: {}".format(kwargs["joiner_model_file"], kwargs["joiner_model_file_sub_folder"]))
        _ = huggingface_hub.hf_hub_download(
            repo_id=repo_id,
            filename=kwargs["joiner_model_file"],
            subfolder=kwargs["joiner_model_file_sub_folder"],
            local_dir=local_model_dir,
        )

    if "tokens_file" in kwargs.keys():
        main_logger.info("download tokens_file. filename: {}, subfolder: {}".format(kwargs["tokens_file"], kwargs["tokens_file_sub_folder"]))
        _ = huggingface_hub.hf_hub_download(
            repo_id=repo_id,
            filename=kwargs["tokens_file"],
            subfolder=kwargs["tokens_file_sub_folder"],
            local_dir=local_model_dir,
        )


def load_sherpa_offline_recognizer(nn_model_file: str,
                                   tokens_file: str,
                                   sample_rate: int = 16000,
                                   num_active_paths: int = 2,
                                   decoding_method: str = "greedy_search",
                                   num_mel_bins: int = 80,
                                   frame_dither: int = 0,
                                   normalize_samples: bool = False,
                                   ):
    feat_config = sherpa.FeatureConfig(normalize_samples=normalize_samples)
    feat_config.fbank_opts.frame_opts.samp_freq = sample_rate
    feat_config.fbank_opts.mel_opts.num_bins = num_mel_bins
    feat_config.fbank_opts.frame_opts.dither = frame_dither

    if not os.path.exists(nn_model_file):
        raise AssertionError("nn_model_file not found. nn_model_file: {}".format(nn_model_file))

    config = sherpa.OfflineRecognizerConfig(
        nn_model=nn_model_file,
        tokens=tokens_file,
        use_gpu=False,
        feat_config=feat_config,
        decoding_method=decoding_method,
        num_active_paths=num_active_paths,
    )

    recognizer = sherpa.OfflineRecognizer(config)

    return recognizer


def load_sherpa_offline_recognizer_from_paraformer(nn_model_file: str,
                                                   tokens_file: str,
                                                   sample_rate: int = 16000,
                                                   decoding_method: str = "greedy_search",
                                                   feature_dim: int = 80,
                                                   num_threads: int = 2,
                                                   ):
    recognizer = sherpa_onnx.OfflineRecognizer.from_paraformer(
        paraformer=nn_model_file,
        tokens=tokens_file,
        num_threads=num_threads,
        sample_rate=sample_rate,
        feature_dim=feature_dim,
        decoding_method=decoding_method,
        debug=False,
    )
    return recognizer


def load_sherpa_offline_recognizer_from_transducer(encoder_model_file: str,
                                                   decoder_model_file: str,
                                                   joiner_model_file: str,
                                                   tokens_file: str,
                                                   sample_rate: int = 16000,
                                                   decoding_method: str = "greedy_search",
                                                   feature_dim: int = 80,
                                                   num_threads: int = 2,
                                                   num_active_paths: int = 2,
                                                   ):
    recognizer = sherpa_onnx.OfflineRecognizer.from_transducer(
        encoder=encoder_model_file,
        decoder=decoder_model_file,
        joiner=joiner_model_file,
        tokens=tokens_file,
        num_threads=num_threads,
        sample_rate=sample_rate,
        feature_dim=feature_dim,
        decoding_method=decoding_method,
        max_active_paths=num_active_paths,
    )
    return recognizer


def load_recognizer(local_model_dir: Path,
                    decoding_method: str = "greedy_search",
                    num_active_paths: int = 4,
                    **kwargs
                    ):
    if not local_model_dir.exists():
        download_model(
            local_model_dir=local_model_dir.as_posix(),
            **kwargs,
        )

    loader = kwargs["loader"]

    kwargs_ = dict()
    if "nn_model_file" in kwargs.keys():
        nn_model_file = (local_model_dir / kwargs["nn_model_file"]).as_posix()
        kwargs_["nn_model_file"] = nn_model_file
    if "encoder_model_file" in kwargs.keys():
        encoder_model_file = (local_model_dir / kwargs["encoder_model_file"]).as_posix()
        kwargs_["encoder_model_file"] = encoder_model_file
    if "decoder_model_file" in kwargs.keys():
        decoder_model_file = (local_model_dir / kwargs["decoder_model_file"]).as_posix()
        kwargs_["decoder_model_file"] = decoder_model_file
    if "joiner_model_file" in kwargs.keys():
        joiner_model_file = (local_model_dir / kwargs["joiner_model_file"]).as_posix()
        kwargs_["joiner_model_file"] = joiner_model_file
    if "tokens_file" in kwargs.keys():
        tokens_file = (local_model_dir / kwargs["tokens_file"]).as_posix()
        kwargs_["tokens_file"] = tokens_file
    if "normalize_samples" in kwargs.keys():
        kwargs_["normalize_samples"] = kwargs["normalize_samples"]

    if loader == "load_sherpa_offline_recognizer":
        recognizer = load_sherpa_offline_recognizer(
            decoding_method=decoding_method,
            num_active_paths=num_active_paths,
            **kwargs_
        )
    elif loader == "load_sherpa_offline_recognizer_from_paraformer":
        recognizer = load_sherpa_offline_recognizer_from_paraformer(
            decoding_method=decoding_method,
            **kwargs_
        )
    elif loader == "load_sherpa_offline_recognizer_from_transducer":
        recognizer = load_sherpa_offline_recognizer_from_transducer(
            decoding_method=decoding_method,
            **kwargs_
        )
    else:
        raise NotImplementedError("loader not support: {}".format(loader))
    return recognizer


if __name__ == "__main__":
    pass