from pydantic import BaseModel
from environs import Env
from typing import List, Dict, Any
import os
import base64
import numpy as np
import librosa
from scipy.io import wavfile
import asyncio
from voice_processing import tts, get_model_names, voice_mapping, get_unique_filename

class EndpointHandler:
    def __init__(self, model_dir=None):
        self.model_dir = model_dir

    def __call__(self, data: Dict[str, Any]) -> Dict[str, Any]:
        try:
            if "inputs" in data:  # Check if data is in Hugging Face JSON format
                return self.process_hf_input(data)
            else:
                return self.process_json_input(data)
        except ValueError as e:
            return {"error": str(e)}
        except Exception as e:
            return {"error": str(e)}

    def process_json_input(self, json_data):
        if all(key in json_data for key in ["model_name", "tts_text", "selected_voice", "slang_rate", "use_uploaded_voice"]):
            model_name = json_data["model_name"]
            tts_text = json_data["tts_text"]
            selected_voice = json_data["selected_voice"]
            slang_rate = json_data["slang_rate"]
            use_uploaded_voice = json_data["use_uploaded_voice"]
            voice_upload_file = json_data.get("voice_upload_file", None)

            edge_tts_voice = voice_mapping.get(selected_voice)
            if not edge_tts_voice:
                raise ValueError(f"Invalid voice '{selected_voice}'.")

            info, edge_tts_output_path, tts_output_data, edge_output_file = asyncio.run(tts(
                model_name, tts_text, edge_tts_voice, slang_rate, use_uploaded_voice, voice_upload_file
            ))

            if edge_output_file and os.path.exists(edge_output_file):
                os.remove(edge_output_file)

            _, audio_output = tts_output_data

            audio_file_path = self.save_audio_data_to_file(audio_output) if isinstance(audio_output, np.ndarray) else audio_output

            try:
                with open(audio_file_path, 'rb') as file:
                    audio_bytes = file.read()
                audio_data_uri = f"data:audio/wav;base64,{base64.b64encode(audio_bytes).decode('utf-8')}"
            except Exception as e:
                raise Exception(f"Failed to read audio file: {e}")
            finally:
                if os.path.exists(audio_file_path):
                    os.remove(audio_file_path)

            return {"info": info, "audio_data_uri": audio_data_uri}
        else:
            raise ValueError("Invalid JSON structure.")

    def process_hf_input(self, hf_data):
        if "inputs" in hf_data:
            actual_data = hf_data["inputs"]
            return self.process_json_input(actual_data)
        else:
            return {"error": "Invalid Hugging Face JSON structure."}

    def save_audio_data_to_file(self, audio_data, sample_rate=40000):
        file_path = get_unique_filename('wav')
        wavfile.write(file_path, sample_rate, audio_data)
        return file_path