conver.py

from dataclasses import dataclass
from typing import List, Tuple, Dict
import os
import re
import httpx
import json
from openai import OpenAI
import edge_tts
import tempfile
import wave
from pydub import AudioSegment
import base64
from pathlib import Path


@dataclass
class ConversationConfig:
    max_words: int = 3000
    prefix_url: str = "https://r.jina.ai/"
    model_name: str = "meta-llama/Meta-Llama-3.1-8B-Instruct-Turbo"


class URLToAudioConverter:
    def __init__(self, config: ConversationConfig, llm_api_key: str):
        self.config = config
        self.llm_client = OpenAI(api_key=llm_api_key, base_url="https://api.together.xyz/v1")
        self.llm_out = None

    def fetch_text(self, url: str) -> str:
        if not url:
            raise ValueError("URL cannot be empty")

        full_url = f"{self.config.prefix_url}{url}"
        try:
            response = httpx.get(full_url, timeout=60.0)
            response.raise_for_status()
            return response.text
        except httpx.HTTPError as e:
            raise RuntimeError(f"Failed to fetch URL: {e}")

    def extract_conversation(self, text: str) -> Dict:
        if not text:
            raise ValueError("Input text cannot be empty")

        try:
            chat_completion = self.llm_client.chat.completions.create(
                messages=[{"role": "user", "content": self._build_prompt(text)}],
                model=self.config.model_name,
            )

            pattern = r"\{(?:[^{}]|(?:\{[^{}]*\}))*\}"
            json_match = re.search(pattern, chat_completion.choices[0].message.content)

            if not json_match:
                raise ValueError("No valid JSON found in response")

            return json.loads(json_match.group())
        except Exception as e:
            raise RuntimeError(f"Failed to extract conversation: {e}")

    def _build_prompt(self, text: str) -> str:
        template = """
        {
            "conversation": [
                {"speaker": "", "text": ""},
                {"speaker": "", "text": ""}
            ]
        }
        """
        return (
            f"{text}\nConvert the provided text into a short informative and crisp "
            f"podcast conversation between two experts. The tone should be "
            f"professional and engaging. Please adhere to the following "
            f"format and return the conversation in JSON:\n{template}"
        )

    async def text_to_speech(self, conversation_json: Dict, voice_1: str, voice_2: str) -> Tuple[List[str], str]:
        output_dir = Path(self._create_output_directory())
        filenames = []

        try:
            for i, turn in enumerate(conversation_json["conversation"]):
                filename = output_dir / f"output_{i}.wav"
                voice = voice_1 if i % 2 == 0 else voice_2

                tmp_path, error = await self._generate_audio(turn["text"], voice)
                if error:
                    raise RuntimeError(f"Text-to-speech failed: {error}")

                os.rename(tmp_path, filename)
                filenames.append(str(filename))

            return filenames, str(output_dir)
        except Exception as e:
            raise RuntimeError(f"Failed to convert text to speech: {e}")

    async def _generate_audio(self, text: str, voice: str, rate: int = 0, pitch: int = 0) -> Tuple[str, str]:
        if not text.strip():
            return None, "Text cannot be empty"
        if not voice:
            return None, "Voice cannot be empty"

        voice_short_name = voice.split(" - ")[0]
        rate_str = f"{rate:+d}%"
        pitch_str = f"{pitch:+d}Hz"
        communicate = edge_tts.Communicate(text, voice_short_name, rate=rate_str, pitch=pitch_str)

        with tempfile.NamedTemporaryFile(delete=False, suffix=".wav") as tmp_file:
            tmp_path = tmp_file.name
            await communicate.save(tmp_path)

        return tmp_path, None

    def _create_output_directory(self) -> str:
        random_bytes = os.urandom(8)
        folder_name = base64.urlsafe_b64encode(random_bytes).decode("utf-8")
        os.makedirs(folder_name, exist_ok=True)
        return folder_name

    def combine_audio_files(self, filenames: List[str], output_file: str) -> None:
        if not filenames:
            raise ValueError("No input files provided")

        try:
            audio_segments = []

            for filename in filenames:
                audio_segment = AudioSegment.from_mp3(filename)
                audio_segments.append(audio_segment)

            combined = sum(audio_segments)

            combined.export(output_file, format="wav")

            for filename in filenames:
                os.remove(filename)

        except Exception as e:
            raise RuntimeError(f"Failed to combine audio files: {e}")

    async def url_to_audio(self, url: str, voice_1: str, voice_2: str) -> str:
        text = self.fetch_text(url)

        words = text.split()
        if len(words) > self.config.max_words:
            text = " ".join(words[: self.config.max_words])

        conversation_json = self.extract_conversation(text)
        self.llm_out = conversation_json
        audio_files, folder_name = await self.text_to_speech(
            conversation_json, voice_1, voice_2
        )

        final_output = os.path.join(folder_name, "combined_output.wav")
        self.combine_audio_files(audio_files, final_output)
        return final_output