import os
import traceback
import faiss
from data.ModelSlot import RVCModelSlot

from voice_changer.RVC.deviceManager.DeviceManager import DeviceManager
from voice_changer.RVC.embedder.EmbedderManager import EmbedderManager
from voice_changer.RVC.inferencer.InferencerManager import InferencerManager
from voice_changer.RVC.pipeline.Pipeline import Pipeline
from voice_changer.RVC.pitchExtractor.PitchExtractorManager import PitchExtractorManager


def createPipeline(modelSlot: RVCModelSlot, gpu: int, f0Detector: str):
    dev = DeviceManager.get_instance().getDevice(gpu)
    half = DeviceManager.get_instance().halfPrecisionAvailable(gpu)

    # Inferencer 生成
    try:
        inferencer = InferencerManager.getInferencer(modelSlot.modelType, modelSlot.modelFile, gpu)
    except Exception as e:
        print("[Voice Changer] exception! loading inferencer", e)
        traceback.print_exc()

    # Embedder 生成
    try:
        embedder = EmbedderManager.getEmbedder(
            modelSlot.embedder,
            # emmbedderFilename,
            half,
            dev,
        )
    except Exception as e:
        print("[Voice Changer]  exception! loading embedder", e)
        traceback.print_exc()

    # pitchExtractor
    pitchExtractor = PitchExtractorManager.getPitchExtractor(f0Detector, gpu)

    # index, feature
    index = _loadIndex(modelSlot)

    pipeline = Pipeline(
        embedder,
        inferencer,
        pitchExtractor,
        index,
        modelSlot.samplingRate,
        dev,
        half,
    )

    return pipeline


def _loadIndex(modelSlot: RVCModelSlot):
    # Indexのロード
    print("[Voice Changer] Loading index...")
    # ファイル指定がない場合はNone
    if modelSlot.indexFile is None:
        print("[Voice Changer] Index is None, not used")
        return None

    # ファイル指定があってもファイルがない場合はNone
    if os.path.exists(modelSlot.indexFile) is not True:
        return None

    try:
        print("Try loading...", modelSlot.indexFile)
        index = faiss.read_index(modelSlot.indexFile)
    except: # NOQA
        print("[Voice Changer] load index failed. Use no index.")
        traceback.print_exc()
        return None

    return index