import base64
import io
import os
import tempfile
import wave
import torch
import numpy as np
from typing import List
from pydantic import BaseModel
import spaces

from TTS.tts.configs.xtts_config import XttsConfig
from TTS.tts.models.xtts import Xtts
from trainer.io import get_user_data_dir
from TTS.utils.manage import ModelManager

os.environ["COQUI_TOS_AGREED"] = "1"

torch.set_num_threads(int(os.environ.get("NUM_THREADS", os.cpu_count())))
device = torch.device("cuda" if os.environ.get("USE_CPU", "0") == "0" else "cpu")
if not torch.cuda.is_available() and device == "cuda":
    raise RuntimeError("CUDA device unavailable, please use Dockerfile.cpu instead.") 

custom_model_path = os.environ.get("CUSTOM_MODEL_PATH", "/app/tts_models")

if os.path.exists(custom_model_path) and os.path.isfile(custom_model_path + "/config.json"):
    model_path = custom_model_path
    print("Loading custom model from", model_path, flush=True)
else:
    print("Loading default model", flush=True)
    model_name = "tts_models/multilingual/multi-dataset/xtts_v2"
    print("Downloading XTTS Model:", model_name, flush=True)
    ModelManager().download_model(model_name)
    model_path = os.path.join(get_user_data_dir("tts"), model_name.replace("/", "--"))
    print("XTTS Model downloaded", flush=True)

print("Loading XTTS", flush=True)
config = XttsConfig()
config.load_json(os.path.join(model_path, "config.json"))
model = Xtts.init_from_config(config)
model.load_checkpoint(config, checkpoint_dir=model_path, eval=True, use_deepspeed=True if device == "cuda" else False)
model.to(device)
print("XTTS Loaded.", flush=True)

print("Running XTTS Server ...", flush=True)



# @app.post("/clone_speaker")
@spaces.GPU
def predict_speaker(wav_file):
    """Compute conditioning inputs from reference audio file."""

    if isinstance(wav_file, str):
        wav_file = open(wav_file,"rb");
        
    
    temp_audio_name = next(tempfile._get_candidate_names())
    with open(temp_audio_name, "wb") as temp, torch.inference_mode():
        temp.write(io.BytesIO(wav_file.read()).getbuffer())
        gpt_cond_latent, speaker_embedding = model.get_conditioning_latents(
            temp_audio_name
        )
    return {
        "gpt_cond_latent": gpt_cond_latent.cpu().squeeze().half().tolist(),
        "speaker_embedding": speaker_embedding.cpu().squeeze().half().tolist(),
    }


def postprocess(wav):
    """Post process the output waveform"""
    if isinstance(wav, list):
        wav = torch.cat(wav, dim=0)
    wav = wav.clone().detach().cpu().numpy()
    wav = wav[None, : int(wav.shape[0])]
    wav = np.clip(wav, -1, 1)
    wav = (wav * 32767).astype(np.int16)
    return wav


def encode_audio_common(
    frame_input, encode_base64=True, sample_rate=24000, sample_width=2, channels=1
):
    """Return base64 encoded audio"""
    wav_buf = io.BytesIO()
    with wave.open(wav_buf, "wb") as vfout:
        vfout.setnchannels(channels)
        vfout.setsampwidth(sample_width)
        vfout.setframerate(sample_rate)
        vfout.writeframes(frame_input)

    wav_buf.seek(0)
    if encode_base64:
        b64_encoded = base64.b64encode(wav_buf.getbuffer()).decode("utf-8")
        return b64_encoded
    else:
        return wav_buf.read()


class StreamingInputs(BaseModel):
    speaker_embedding: List[float]
    gpt_cond_latent: List[List[float]]
    text: str
    language: str
    add_wav_header: bool = True
    stream_chunk_size: str = "20"

#
#def predict_streaming_generator(parsed_input: dict = Body(...)):
#    speaker_embedding = torch.tensor(parsed_input.speaker_embedding).unsqueeze(0).unsqueeze(-1)
#    gpt_cond_latent = torch.tensor(parsed_input.gpt_cond_latent).reshape((-1, 1024)).unsqueeze(0)
#    text = parsed_input.text
#    language = parsed_input.language
#
#    stream_chunk_size = int(parsed_input.stream_chunk_size)
#    add_wav_header = parsed_input.add_wav_header
#
#
#    chunks = model.inference_stream(
#        text,
#        language,
#        gpt_cond_latent,
#        speaker_embedding,
#        stream_chunk_size=stream_chunk_size,
#        enable_text_splitting=True
#    )
#
#    for i, chunk in enumerate(chunks):
#        chunk = postprocess(chunk)
#        if i == 0 and add_wav_header:
#            yield encode_audio_common(b"", encode_base64=False)
#            yield chunk.tobytes()
#        else:
#            yield chunk.tobytes()
#
#
## @app.post("/tts_stream")
#def predict_streaming_endpoint(parsed_input: StreamingInputs):
#    return StreamingResponse(
#        predict_streaming_generator(parsed_input),
#        media_type="audio/wav",
#    )

class TTSInputs(BaseModel):
    speaker_embedding: List[float]
    gpt_cond_latent: List[List[float]]
    text: str
    language: str
    temperature: float
    speed: float
    top_k: int
    top_p: float

# @app.post("/tts")
@spaces.GPU
def predict_speech(parsed_input: TTSInputs):
    speaker_embedding = torch.tensor(parsed_input.speaker_embedding).unsqueeze(0).unsqueeze(-1)
    gpt_cond_latent = torch.tensor(parsed_input.gpt_cond_latent).reshape((-1, 1024)).unsqueeze(0)
    
    text = parsed_input.text
    language = parsed_input.language
    temperature = parsed_input.temperature
    speed = parsed_input.speed
    top_k = parsed_input.top_k
    top_p = parsed_input.top_p
    length_penalty = 1.0
    repetition_penalty= 2.0
    
    
    out = model.inference(
        text,
        language,
        gpt_cond_latent,
        speaker_embedding,
        temperature,
        length_penalty,
        repetition_penalty,
        top_k,
        top_p,
        speed,
    )

    wav = postprocess(torch.tensor(out["wav"]))

    return encode_audio_common(wav.tobytes())


# @app.get("/studio_speakers")
def get_speakers():
    if hasattr(model, "speaker_manager") and hasattr(model.speaker_manager, "speakers"):
        return {
            speaker: {
                "speaker_embedding": model.speaker_manager.speakers[speaker]["speaker_embedding"].cpu().squeeze().half().tolist(),
                "gpt_cond_latent": model.speaker_manager.speakers[speaker]["gpt_cond_latent"].cpu().squeeze().half().tolist(),
            }
            for speaker in model.speaker_manager.speakers.keys()
        }
    else:
        return {}
        
# @app.get("/languages")
def get_languages():
    return config.languages