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 pysrt

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

# Initialize parser
parser = argparse.ArgumentParser()
parser.add_argument(
    "-a", "--audio", help="name of the target audio file", required=True
)
parser.add_argument(
    "-s", "--srt", help="name of the target SRT file", 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 ensure_dir(directory):
    if not os.path.exists(directory):
        os.makedirs(directory)

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 "{args.audio}" -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 = args.audio
    else:
        vocal_target = os.path.join(
            "temp_outputs",
            "htdemucs",
            os.path.splitext(os.path.basename(args.audio))[0],
            "vocals.wav",
        )
else:
    vocal_target = args.audio

# 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)
ROOT = os.getcwd()
temp_path = os.path.join(ROOT, "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)

# Load the SRT file
subs = pysrt.open(args.srt)

# Base directory for the LJ Speech-like structure
base_dir = "LJ_Speech_dataset"

# Dictionary to hold audio segments and texts for easpeaker_audios_texts = {}

# Process each subtitle
for sub in subs:
    start_time = (sub.start.hours * 3600 + sub.start.minutes * 60 + sub.start.seconds) * 1000 + sub.start.milliseconds
    end_time = (sub.end.hours * 3600 + sub.end.minutes * 60 + sub.end.seconds) * 1000 + sub.end.milliseconds
    
    # Extract speaker and text from the subtitle
    speaker_text = sub.text.split(':')
    if len(speaker_text) > 1:
        speaker = speaker_text[0].strip()
        text = ':'.join(speaker_text[1:]).strip()
        segment = sound[start_time:end_time]
        
        # Append or create the audio segment and text for the speaker
        if speaker not in speaker_audios_texts:
            speaker_audios_texts[speaker] = []
        speaker_audios_texts[speaker].append((segment, text))

# Save each speaker's audio to a separate file and generate metadata
for speaker, segments_texts in speaker_audios_texts.items():
    speaker_dir = os.path.join(base_dir, speaker.replace(' ', '_'))
    ensure_dir(speaker_dir)
    
    metadata_lines = []
    for i, (segment, text) in enumerate(segments_texts, start=1):
        filename = f"{speaker.replace(' ', '_')}_{i:03}.wav"
        filepath = os.path.join(speaker_dir, filename)
        segment.export(filepath, format="wav")
        
        # Prepare metadata line (filename without extension, speaker, text)
        metadata_lines.append(f"{filename[:-4]}|{speaker}|{text}")
    
    # Save metadata to a file
    metadata_file = os.path.join(speaker_dir, "metadata.csv")
    with open(metadata_file, "w", encoding="utf-8") as f:
        f.write("\n".join(metadata_lines))
    
    print(f"Exported files and metadata for {speaker}")

# Move the original WAV and SRT files to the "handled" subfolder
handled_dir = "handled"
ensure_dir(handled_dir)
os.rename(args.audio, os.path.join(handled_dir, os.path.basename(args.audio)))
os.rename(args.srt, os.path.join(handled_dir, os.path.basename(args.srt)))

print(f"Moved {args.audio} and {args.srt} to the 'handled' subfolder.")

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

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

cleanup(temp_path)