from flask import Blueprint, request, jsonify, send_file
import subprocess
import os
import logging
import uuid
from flask import current_app

bp = Blueprint('main', __name__)

def _build_command_args(args):
    return [
        args['voicepeak_path'],
        "-s", args['script'],
        "-n", args['narrator'],
        "-o", args['output_path'],
        "-e", args['emotions'],
        "--pitch", str(args['pitch']),
    ]

def _synthesize_with_voicepeak(script, narrator, emotions, pitch, output_path, retries=3):
    args = {
        'voicepeak_path': current_app.config['VOICEPEAK_PATH'],
        'script': script,
        'narrator': narrator,
        'output_path': output_path,
        'emotions': emotions,
        'pitch': pitch,
    }
    command_args = _build_command_args(args)

    for attempt in range(retries):
        try:
            subprocess.run(command_args, check=True)
            if os.path.exists(output_path):
                return output_path
        except subprocess.CalledProcessError as e:
            error_message = f"VoicePeak synthesis failed on attempt {attempt + 1}: {e}"
            logging.error(error_message)
            if attempt < retries - 1:
                logging.info(f"Retrying... ({attempt + 2}/{retries})")
            else:
                raise RuntimeError(error_message) from e

    error_message = f"Expected audio file not found after {retries} attempts: {output_path}"
    logging.error(error_message)
    raise FileNotFoundError(error_message)

@bp.route('/generate_voice', methods=['POST'])
def generate_voice():
    try:
        data = request.json
        text = data.get('text')
        narrator = data.get('narrator', '1')
        emotion_happy = data.get('emotion_happy', '0')
        emotion_sad = data.get('emotion_sad', '0')
        emotion_angry = data.get('emotion_angry', '0')
        emotion_fun = data.get('emotion_fun', '0')
        pitch = data.get('pitch', '1')
        
        if not text:
            return jsonify({'error': 'Text is required'}), 400

        emotions = f"happy={emotion_happy},sad={emotion_sad},angry={emotion_angry},fun={emotion_fun}"
        
        unique_id = str(uuid.uuid4())
        output_file = os.path.join(current_app.config['PROJECT_PATH'], f'{unique_id}.wav')
        
        _synthesize_with_voicepeak(text, narrator, emotions, pitch, output_file)

        response = send_file(output_file, mimetype='audio/wav')
        
        os.remove(output_file)
        
        return response
    
    except Exception as e:
        return jsonify({'error': str(e)}), 500