import io
import logging
import os
import time
from typing import Any, Callable, Dict, Iterator, Literal, Optional, Tuple, Union

from langchain_core.documents import Document

from langchain_community.document_loaders.base import BaseBlobParser
from langchain_community.document_loaders.blob_loaders import Blob
from langchain_community.utils.openai import is_openai_v1

logger = logging.getLogger(__name__)


class AzureOpenAIWhisperParser(BaseBlobParser):
    """
    Transcribe and parse audio files using Azure OpenAI Whisper.

    This parser integrates with the Azure OpenAI Whisper model to transcribe
    audio files. It differs from the standard OpenAI Whisper parser, requiring
    an Azure endpoint and credentials. The parser is limited to files under 25 MB.

    **Note**:
    This parser uses the Azure OpenAI API, providing integration with the Azure
     ecosystem, and making it suitable for workflows involving other Azure services.

    For files larger than 25 MB, consider using Azure AI Speech batch transcription:
    https://learn.microsoft.com/azure/ai-services/speech-service/batch-transcription-create?pivots=rest-api#use-a-whisper-model

    Setup:
        1. Follow the instructions here to deploy Azure Whisper:
           https://learn.microsoft.com/azure/ai-services/openai/whisper-quickstart?tabs=command-line%2Cpython-new&pivots=programming-language-python
        2. Install ``langchain`` and set the following environment variables:

        .. code-block:: bash

            pip install -U langchain langchain-community

            export AZURE_OPENAI_API_KEY="your-api-key"
            export AZURE_OPENAI_ENDPOINT="https://your-endpoint.openai.azure.com/"
            export OPENAI_API_VERSION="your-api-version"

    Example Usage:
        .. code-block:: python

            from langchain.community import AzureOpenAIWhisperParser

            whisper_parser = AzureOpenAIWhisperParser(
                deployment_name="your-whisper-deployment",
                api_version="2024-06-01",
                api_key="your-api-key",
                # other params...
            )

            audio_blob = Blob(path="your-audio-file-path")
            response = whisper_parser.lazy_parse(audio_blob)

            for document in response:
                print(document.page_content)

    Integration with Other Loaders:
        The AzureOpenAIWhisperParser can be used with video/audio loaders and
        `GenericLoader` to automate retrieval and parsing.

    YoutubeAudioLoader Example:
        .. code-block:: python

            from langchain_community.document_loaders.blob_loaders import (
                YoutubeAudioLoader
                )
            from langchain_community.document_loaders.generic import GenericLoader

            # Must be a list
            youtube_url = ["https://your-youtube-url"]
            save_dir = "directory-to-download-videos"

            loader = GenericLoader(
                YoutubeAudioLoader(youtube_url, save_dir),
                AzureOpenAIWhisperParser(deployment_name="your-deployment-name")
            )

            docs = loader.load()
    """

    def __init__(
        self,
        *,
        api_key: Optional[str] = None,
        azure_endpoint: Optional[str] = None,
        api_version: Optional[str] = None,
        azure_ad_token_provider: Union[Callable[[], str], None] = None,
        language: Optional[str] = None,
        prompt: Optional[str] = None,
        response_format: Union[
            Literal["json", "text", "srt", "verbose_json", "vtt"], None
        ] = None,
        temperature: Optional[float] = None,
        deployment_name: str,
        max_retries: int = 3,
    ):
        """
        Initialize the AzureOpenAIWhisperParser.

        Args:
            api_key (Optional[str]):
                Azure OpenAI API key. If not provided, defaults to the
                `AZURE_OPENAI_API_KEY` environment variable.
            azure_endpoint (Optional[str]):
                Azure OpenAI service endpoint. Defaults to `AZURE_OPENAI_ENDPOINT`
                environment variable if not set.
            api_version (Optional[str]):
                API version to use,
                defaults to the `OPENAI_API_VERSION` environment variable.
            azure_ad_token_provider (Union[Callable[[], str], None]):
                Azure Active Directory token for authentication (if applicable).
            language (Optional[str]):
                Language in which the request should be processed.
            prompt (Optional[str]):
                Custom instructions or prompt for the Whisper model.
            response_format (Union[str, None]):
                The desired output format. Options: "json", "text", "srt",
                "verbose_json", "vtt".
            temperature (Optional[float]):
                Controls the randomness of the model's output.
            deployment_name (str):
                The deployment name of the Whisper model.
            max_retries (int):
                Maximum number of retries for failed API requests.
        Raises:
            ImportError:
                If the required package `openai` is not installed.
        """
        self.api_key = api_key or os.environ.get("AZURE_OPENAI_API_KEY")
        self.azure_endpoint = azure_endpoint or os.environ.get("AZURE_OPENAI_ENDPOINT")
        self.api_version = api_version or os.environ.get("OPENAI_API_VERSION")
        self.azure_ad_token_provider = azure_ad_token_provider

        self.language = language
        self.prompt = prompt
        self.response_format = response_format
        self.temperature = temperature

        self.deployment_name = deployment_name
        self.max_retries = max_retries

        try:
            import openai
        except ImportError:
            raise ImportError(
                "openai package not found, please install it with `pip install openai`"
            )

        if is_openai_v1():
            self._client = openai.AzureOpenAI(
                api_key=self.api_key,
                azure_endpoint=self.azure_endpoint,
                api_version=self.api_version,
                max_retries=self.max_retries,
                azure_ad_token_provider=self.azure_ad_token_provider,
            )
        else:
            if self.api_key:
                openai.api_key = self.api_key
            if self.azure_endpoint:
                openai.api_base = self.azure_endpoint
            if self.api_version:
                openai.api_version = self.api_version
            openai.api_type = "azure"
            self._client = openai

    @property
    def _create_params(self) -> Dict[str, Any]:
        params = {
            "language": self.language,
            "prompt": self.prompt,
            "response_format": self.response_format,
            "temperature": self.temperature,
        }
        return {k: v for k, v in params.items() if v is not None}

    def lazy_parse(self, blob: Blob) -> Iterator[Document]:
        """
        Lazily parse the provided audio blob for transcription.

        Args:
            blob (Blob):
                The audio file in Blob format to be transcribed.

        Yields:
            Document:
                Parsed transcription from the audio file.

        Raises:
            Exception:
                If an error occurs during transcription.
        """

        file_obj = open(str(blob.path), "rb")

        # Transcribe
        try:
            if is_openai_v1():
                transcript = self._client.audio.transcriptions.create(
                    model=self.deployment_name,
                    file=file_obj,
                    **self._create_params,
                )
            else:
                transcript = self._client.Audio.transcribe(
                    model=self.deployment_name,
                    deployment_id=self.deployment_name,
                    file=file_obj,
                    **self._create_params,
                )
        except Exception:
            raise

        yield Document(
            page_content=transcript.text
            if not isinstance(transcript, str)
            else transcript,
            metadata={"source": blob.source},
        )


class OpenAIWhisperParser(BaseBlobParser):
    """Transcribe and parse audio files.

    Audio transcription is with OpenAI Whisper model.

    Args:
        api_key: OpenAI API key
        chunk_duration_threshold: Minimum duration of a chunk in seconds
            NOTE: According to the OpenAI API, the chunk duration should be at least 0.1
            seconds. If the chunk duration is less or equal than the threshold,
            it will be skipped.
    """

    def __init__(
        self,
        api_key: Optional[str] = None,
        *,
        chunk_duration_threshold: float = 0.1,
        base_url: Optional[str] = None,
        language: Union[str, None] = None,
        prompt: Union[str, None] = None,
        response_format: Union[
            Literal["json", "text", "srt", "verbose_json", "vtt"], None
        ] = None,
        temperature: Union[float, None] = None,
        model: str = "whisper-1",
    ):
        self.api_key = api_key
        self.chunk_duration_threshold = chunk_duration_threshold
        self.base_url = (
            base_url if base_url is not None else os.environ.get("OPENAI_API_BASE")
        )
        self.language = language
        self.prompt = prompt
        self.response_format = response_format
        self.temperature = temperature
        self.model = model

    @property
    def _create_params(self) -> Dict[str, Any]:
        params = {
            "language": self.language,
            "prompt": self.prompt,
            "response_format": self.response_format,
            "temperature": self.temperature,
        }
        return {k: v for k, v in params.items() if v is not None}

    def lazy_parse(self, blob: Blob) -> Iterator[Document]:
        """Lazily parse the blob."""

        try:
            import openai
        except ImportError:
            raise ImportError(
                "openai package not found, please install it with `pip install openai`"
            )

        audio = _get_audio_from_blob(blob)

        if is_openai_v1():
            # api_key optional, defaults to `os.environ['OPENAI_API_KEY']`
            client = openai.OpenAI(api_key=self.api_key, base_url=self.base_url)
        else:
            # Set the API key if provided
            if self.api_key:
                openai.api_key = self.api_key
            if self.base_url:
                openai.api_base = self.base_url

        # Define the duration of each chunk in minutes
        # Need to meet 25MB size limit for Whisper API
        chunk_duration = 20
        chunk_duration_ms = chunk_duration * 60 * 1000

        # Split the audio into chunk_duration_ms chunks
        for split_number, i in enumerate(range(0, len(audio), chunk_duration_ms)):
            # Audio chunk
            chunk = audio[i : i + chunk_duration_ms]
            # Skip chunks that are too short to transcribe
            if chunk.duration_seconds <= self.chunk_duration_threshold:
                continue
            file_obj = io.BytesIO(chunk.export(format="mp3").read())
            if blob.source is not None:
                file_obj.name = blob.source + f"_part_{split_number}.mp3"
            else:
                file_obj.name = f"part_{split_number}.mp3"

            # Transcribe
            print(f"Transcribing part {split_number + 1}!")  # noqa: T201
            attempts = 0
            while attempts < 3:
                try:
                    if is_openai_v1():
                        transcript = client.audio.transcriptions.create(
                            model=self.model, file=file_obj, **self._create_params
                        )
                    else:
                        transcript = openai.Audio.transcribe(self.model, file_obj)
                    break
                except Exception as e:
                    attempts += 1
                    print(f"Attempt {attempts} failed. Exception: {str(e)}")  # noqa: T201
                    time.sleep(5)
            else:
                print("Failed to transcribe after 3 attempts.")  # noqa: T201
                continue

            yield Document(
                page_content=transcript.text
                if not isinstance(transcript, str)
                else transcript,
                metadata={"source": blob.source, "chunk": split_number},
            )


class OpenAIWhisperParserLocal(BaseBlobParser):
    """Transcribe and parse audio files with OpenAI Whisper model.

    Audio transcription with OpenAI Whisper model locally from transformers.

    Parameters:
    device - device to use
        NOTE: By default uses the gpu if available,
        if you want to use cpu, please set device = "cpu"
    lang_model - whisper model to use, for example "openai/whisper-medium"
    forced_decoder_ids - id states for decoder in multilanguage model,
        usage example:
        from transformers import WhisperProcessor
        processor = WhisperProcessor.from_pretrained("openai/whisper-medium")
        forced_decoder_ids = WhisperProcessor.get_decoder_prompt_ids(language="french",
          task="transcribe")
        forced_decoder_ids = WhisperProcessor.get_decoder_prompt_ids(language="french",
        task="translate")



    """

    def __init__(
        self,
        device: str = "0",
        lang_model: Optional[str] = None,
        batch_size: int = 8,
        chunk_length: int = 30,
        forced_decoder_ids: Optional[Tuple[Dict]] = None,
    ):
        """Initialize the parser.

        Args:
            device: device to use.
            lang_model: whisper model to use, for example "openai/whisper-medium".
              Defaults to None.
            forced_decoder_ids: id states for decoder in a multilanguage model.
              Defaults to None.
            batch_size: batch size used for decoding
              Defaults to 8.
            chunk_length: chunk length used during inference.
              Defaults to 30s.
        """
        try:
            from transformers import pipeline
        except ImportError:
            raise ImportError(
                "transformers package not found, please install it with "
                "`pip install transformers`"
            )
        try:
            import torch
        except ImportError:
            raise ImportError(
                "torch package not found, please install it with `pip install torch`"
            )

        # Determine the device to use
        if device == "cpu":
            self.device = "cpu"
        else:
            self.device = "cuda:0" if torch.cuda.is_available() else "cpu"

        if self.device == "cpu":
            default_model = "openai/whisper-base"
            self.lang_model = lang_model if lang_model else default_model
        else:
            # Set the language model based on the device and available memory
            mem = torch.cuda.get_device_properties(self.device).total_memory / (1024**2)
            if mem < 5000:
                rec_model = "openai/whisper-base"
            elif mem < 7000:
                rec_model = "openai/whisper-small"
            elif mem < 12000:
                rec_model = "openai/whisper-medium"
            else:
                rec_model = "openai/whisper-large"
            self.lang_model = lang_model if lang_model else rec_model

        print("Using the following model: ", self.lang_model)  # noqa: T201

        self.batch_size = batch_size

        # load model for inference
        self.pipe = pipeline(
            "automatic-speech-recognition",
            model=self.lang_model,
            chunk_length_s=chunk_length,
            device=self.device,
        )
        if forced_decoder_ids is not None:
            try:
                self.pipe.model.config.forced_decoder_ids = forced_decoder_ids
            except Exception as exception_text:
                logger.info(
                    "Unable to set forced_decoder_ids parameter for whisper model"
                    f"Text of exception: {exception_text}"
                    "Therefore whisper model will use default mode for decoder"
                )

    def lazy_parse(self, blob: Blob) -> Iterator[Document]:
        """Lazily parse the blob."""

        try:
            import librosa
        except ImportError:
            raise ImportError(
                "librosa package not found, please install it with "
                "`pip install librosa`"
            )

        audio = _get_audio_from_blob(blob)

        file_obj = io.BytesIO(audio.export(format="mp3").read())

        # Transcribe
        print(f"Transcribing part {blob.path}!")  # noqa: T201

        y, sr = librosa.load(file_obj, sr=16000)

        prediction = self.pipe(y.copy(), batch_size=self.batch_size)["text"]

        yield Document(
            page_content=prediction,
            metadata={"source": blob.source},
        )


class YandexSTTParser(BaseBlobParser):
    """Transcribe and parse audio files.
    Audio transcription is with OpenAI Whisper model."""

    def __init__(
        self,
        *,
        api_key: Optional[str] = None,
        iam_token: Optional[str] = None,
        model: str = "general",
        language: str = "auto",
    ):
        """Initialize the parser.

        Args:
            api_key: API key for a service account
            with the `ai.speechkit-stt.user` role.
            iam_token: IAM token for a service account
            with the `ai.speechkit-stt.user` role.
            model: Recognition model name.
              Defaults to general.
            language: The language in ISO 639-1 format.
              Defaults to automatic language recognition.
        Either `api_key` or `iam_token` must be provided, but not both.
        """
        if (api_key is None) == (iam_token is None):
            raise ValueError(
                "Either 'api_key' or 'iam_token' must be provided, but not both."
            )
        self.api_key = api_key
        self.iam_token = iam_token
        self.model = model
        self.language = language

    def lazy_parse(self, blob: Blob) -> Iterator[Document]:
        """Lazily parse the blob."""

        try:
            from speechkit import configure_credentials, creds, model_repository
            from speechkit.stt import AudioProcessingType
        except ImportError:
            raise ImportError(
                "yandex-speechkit package not found, please install it with "
                "`pip install yandex-speechkit`"
            )

        audio = _get_audio_from_blob(blob)

        if self.api_key:
            configure_credentials(
                yandex_credentials=creds.YandexCredentials(api_key=self.api_key)
            )
        else:
            configure_credentials(
                yandex_credentials=creds.YandexCredentials(iam_token=self.iam_token)
            )

        model = model_repository.recognition_model()

        model.model = self.model
        model.language = self.language
        model.audio_processing_type = AudioProcessingType.Full

        result = model.transcribe(audio)

        for res in result:
            yield Document(
                page_content=res.normalized_text,
                metadata={"source": blob.source},
            )


class FasterWhisperParser(BaseBlobParser):
    """Transcribe and parse audio files with faster-whisper.

    faster-whisper is a reimplementation of OpenAI's Whisper model using CTranslate2,
    which is up to 4 times faster than openai/whisper for the same accuracy while using
    less memory. The efficiency can be further improved with 8-bit quantization on both
    CPU and GPU.

    It can automatically detect the following 14 languages and transcribe the text
    into their respective languages: en, zh, fr, de, ja, ko, ru, es, th, it, pt, vi,
    ar, tr.

    The gitbub repository for faster-whisper is :
    https://github.com/SYSTRAN/faster-whisper

    Example: Load a YouTube video and transcribe the video speech into a document.
        .. code-block:: python

            from langchain.document_loaders.generic import GenericLoader
            from langchain_community.document_loaders.parsers.audio
                import FasterWhisperParser
            from langchain.document_loaders.blob_loaders.youtube_audio
                import YoutubeAudioLoader


            url="https://www.youtube.com/watch?v=your_video"
            save_dir="your_dir/"
            loader = GenericLoader(
                YoutubeAudioLoader([url],save_dir),
                FasterWhisperParser()
            )
            docs = loader.load()

    """

    def __init__(
        self,
        *,
        device: Optional[str] = "cuda",
        model_size: Optional[str] = None,
    ):
        """Initialize the parser.

        Args:
            device: It can be "cuda" or "cpu" based on the available device.
            model_size: There are four model sizes to choose from: "base", "small",
                        "medium", and "large-v3", based on the available GPU memory.
        """
        try:
            import torch
        except ImportError:
            raise ImportError(
                "torch package not found, please install it with `pip install torch`"
            )

        # Determine the device to use
        if device == "cpu":
            self.device = "cpu"
        else:
            self.device = "cuda" if torch.cuda.is_available() else "cpu"

        # Determine the model_size
        if self.device == "cpu":
            self.model_size = "base"
        else:
            # Set the model_size based on the available memory
            mem = torch.cuda.get_device_properties(self.device).total_memory / (1024**2)
            if mem < 1000:
                self.model_size = "base"
            elif mem < 3000:
                self.model_size = "small"
            elif mem < 5000:
                self.model_size = "medium"
            else:
                self.model_size = "large-v3"
        # If the user has assigned a model size, then use the assigned size
        if model_size is not None:
            if model_size in ["base", "small", "medium", "large-v3"]:
                self.model_size = model_size

    def lazy_parse(self, blob: Blob) -> Iterator[Document]:
        """Lazily parse the blob."""

        try:
            from faster_whisper import WhisperModel
        except ImportError:
            raise ImportError(
                "faster_whisper package not found, please install it with "
                "`pip install faster-whisper`"
            )

        audio = _get_audio_from_blob(blob)

        file_obj = io.BytesIO(audio.export(format="mp3").read())

        # Transcribe
        model = WhisperModel(self.model_size, device=self.device)

        segments, info = model.transcribe(file_obj, beam_size=5)

        for segment in segments:
            yield Document(
                page_content=segment.text,
                metadata={
                    "source": blob.source,
                    "timestamps": "[%.2fs -> %.2fs]" % (segment.start, segment.end),
                    "language": info.language,
                    "probability": "%d%%" % round(info.language_probability * 100),
                    **blob.metadata,
                },
            )


def _get_audio_from_blob(blob: Blob) -> Any:
    """Get audio data from blob.

    Args:
        blob: Blob object containing the audio data.

    Returns:
        AudioSegment: Audio data from the blob.

    Raises:
        ImportError: If the required package `pydub` is not installed.
        ValueError: If the audio data is not found in the blob
    """
    try:
        from pydub import AudioSegment
    except ImportError:
        raise ImportError(
            "pydub package not found, please install it with `pip install pydub`"
        )

    if isinstance(blob.data, bytes):
        audio = AudioSegment.from_file(io.BytesIO(blob.data))
    elif blob.data is None and blob.path:
        audio = AudioSegment.from_file(blob.path)
    else:
        raise ValueError("Unable to get audio from blob")

    return audio
