import argparse
import os
from helpers import *
from faster_whisper import WhisperModel
import whisperx
import torch
from pydub import AudioSegment
from nemo.collections.asr.models.msdd_models import NeuralDiarizer
from deepmultilingualpunctuation import PunctuationModel
import re
import logging
import shutil

mtypes = {"cpu": "int8", "cuda": "float16"}

# Initialize parser
parser = argparse.ArgumentParser()
parser.add_argument(
    "-d", "--directory", help="path to the directory containing the target files", required=True
)
parser.add_argument(
    "--no-stem",
    action="store_false",
    dest="stemming",
    default=True,
    help="Disables source separation."
    "This helps with long files that don't contain a lot of music.",
)
parser.add_argument(
    "--suppress_numerals",
    action="store_true",
    dest="suppress_numerals",
    default=False,
    help="Suppresses Numerical Digits."
    "This helps the diarization accuracy but converts all digits into written text.",
)
parser.add_argument(
    "--whisper-model",
    dest="model_name",
    default="medium.en",
    help="name of the Whisper model to use",
)
parser.add_argument(
    "--batch-size",
    type=int,
    dest="batch_size",
    default=8,
    help="Batch size for batched inference, reduce if you run out of memory, set to 0 for non-batched inference",
)
parser.add_argument(
    "--language",
    type=str,
    default=None,
    choices=whisper_langs,
    help="Language spoken in the audio, specify None to perform language detection",
)
parser.add_argument(
    "--device",
    dest="device",
    default="cuda" if torch.cuda.is_available() else "cpu",
    help="if you have a GPU use 'cuda', otherwise 'cpu'",
)
args = parser.parse_args()

def process_file(audio_file, output_dir):
    if args.stemming:
        # Isolate vocals from the rest of the audio
        return_code = os.system(
            f'python3 -m demucs.separate -n htdemucs --two-stems=vocals "{audio_file}" -o "temp_outputs"'
        )
        if return_code != 0:
            logging.warning(
                "Source splitting failed, using original audio file. Use --no-stem argument to disable it."
            )
            vocal_target = audio_file
        else:
            vocal_target = os.path.join(
                "temp_outputs",
                "htdemucs",
                os.path.splitext(os.path.basename(audio_file))[0],
                "vocals.wav",
            )
    else:
        vocal_target = audio_file

    # Transcribe the audio file
    if args.batch_size != 0:
        from transcription_helpers import transcribe_batched
        whisper_results, language = transcribe_batched(
            vocal_target,
            args.language,
            args.batch_size,
            args.model_name,
            mtypes[args.device],
            args.suppress_numerals,
            args.device,
        )
    else:
        from transcription_helpers import transcribe
        whisper_results, language = transcribe(
            vocal_target,
            args.language,
            args.model_name,
            mtypes[args.device],
            args.suppress_numerals,
            args.device,
        )

    if language in wav2vec2_langs:
        alignment_model, metadata = whisperx.load_align_model(
            language_code=language, device=args.device
        )
        result_aligned = whisperx.align(
            whisper_results, alignment_model, metadata, vocal_target, args.device
        )
        word_timestamps = filter_missing_timestamps(
            result_aligned["word_segments"],
            initial_timestamp=whisper_results[0].get("start"),
            final_timestamp=whisper_results[-1].get("end"),
        )
        # clear gpu vram
        del alignment_model
        torch.cuda.empty_cache()
    else:
        assert (
            args.batch_size == 0  # TODO: add a better check for word timestamps existence
        ), (
            f"Unsupported language: {language}, use --batch_size to 0"
            " to generate word timestamps using whisper directly and fix this error."
        )
        word_timestamps = []
        for segment in whisper_results:
            for word in segment["words"]:
                word_timestamps.append({"word": word[2], "start": word[0], "end": word[1]})

    # convert audio to mono for NeMo compatibility
    sound = AudioSegment.from_file(vocal_target).set_channels(1)
    temp_path = os.path.join(output_dir, "temp_outputs")
    os.makedirs(temp_path, exist_ok=True)
    sound.export(os.path.join(temp_path, "mono_file.wav"), format="wav")

    # Initialize NeMo MSDD diarization model
    msdd_model = NeuralDiarizer(cfg=create_config(temp_path)).to(args.device)
    msdd_model.diarize()
    del msdd_model
    torch.cuda.empty_cache()

    # Reading timestamps <> Speaker Labels mapping
    speaker_ts = []
    with open(os.path.join(temp_path, "pred_rttms", "mono_file.rttm"), "r") as f:
        lines = f.readlines()
        for line in lines:
            line_list = line.split(" ")
            s = int(float(line_list[5]) * 1000)
            e = s + int(float(line_list[8]) * 1000)
            speaker_ts.append([s, e, int(line_list[11].split("_")[-1])])

    wsm = get_words_speaker_mapping(word_timestamps, speaker_ts, "start")

    if language in punct_model_langs:
        # restoring punctuation in the transcript to help realign the sentences
        punct_model = PunctuationModel(model="kredor/punctuate-all")
        words_list = list(map(lambda x: x["word"], wsm))
        labled_words = punct_model.predict(words_list)
        ending_puncts = ".?!"
        model_puncts = ".,;:!?"
        # We don't want to punctuate U.S.A. with a period. Right?
        is_acronym = lambda x: re.fullmatch(r"\b(?:[a-zA-Z]\.){2,}", x)
        for word_dict, labeled_tuple in zip(wsm, labled_words):
            word = word_dict["word"]
            if (
                word
                and labeled_tuple[1] in ending_puncts
                and (word[-1] not in model_puncts or is_acronym(word))
            ):
                word += labeled_tuple[1]
                if word.endswith(".."):
                    word = word.rstrip(".")
                word_dict["word"] = word
    else:
        logging.warning(
            f"Punctuation restoration is not available for {language} language. Using the original punctuation."
        )

    wsm = get_realigned_ws_mapping_with_punctuation(wsm)
    ssm = get_sentences_speaker_mapping(wsm, speaker_ts)

    with open(os.path.join(output_dir, f"{os.path.splitext(os.path.basename(audio_file))[0]}.txt"), "w", encoding="utf-8-sig") as f:
        get_speaker_aware_transcript(ssm, f)

    with open(os.path.join(output_dir, f"{os.path.splitext(os.path.basename(audio_file))[0]}.srt"), "w", encoding="utf-8-sig") as srt:
        write_srt(ssm, srt)

    cleanup(temp_path)

# Set the target directory containing the .avi files
target_dir = args.directory

# Create the "done" directory in the same location as the script
script_dir = os.path.dirname(os.path.abspath(__file__))
done_dir = os.path.join(script_dir, "done")

# Iterate over the subfolders in the target directory
for root, dirs, files in os.walk(target_dir):
    for file in files:
        if file.endswith(".avi"):
            avi_file = os.path.join(root, file)
            wav_file = os.path.splitext(avi_file)[0] + ".wav"

            # Extract the audio from the .avi file
            os.system(f'ffmpeg -i "{avi_file}" -vn -acodec pcm_s16le -ar 16000 -ac 1 "{wav_file}"')

            # Create the mirrored subfolder structure in the "done" directory
            subfolder = os.path.relpath(root, target_dir)
            output_dir = os.path.join(done_dir, subfolder)
            os.makedirs(output_dir, exist_ok=True)

            # Process the extracted .wav file
            process_file(wav_file, output_dir)

            # Remove the extracted .wav file
            os.remove(wav_file)