import base64
import os
import uuid
from datetime import datetime
from typing import Optional

import httpx
from fastapi import APIRouter, Depends, HTTPException
from sqlalchemy.orm import Session

from ..db import get_db
from ..models import VendorCredential, Voice
from ..schemas import (
    VendorCredentialOut,
    VendorCredentialUpsert,
    VoiceCreate,
    VoiceOut,
    VoicePreviewRequest,
    VoicePreviewResponse,
    VoiceUpdate,
)

router = APIRouter(prefix="/voices", tags=["Voices"])

SILICONFLOW_DEFAULT_MODEL = "FunAudioLLM/CosyVoice2-0.5B"


def _is_siliconflow_vendor(vendor: str) -> bool:
    return vendor.strip().lower() in {"siliconflow", "硅基流动"}


def _canonical_vendor_key(vendor: str) -> str:
    normalized = vendor.strip().lower()
    alias_map = {
        "硅基流动": "siliconflow",
        "siliconflow": "siliconflow",
        "ali": "ali",
        "volcano": "volcano",
        "minimax": "minimax",
    }
    return alias_map.get(normalized, normalized)


def _default_tts_base_url(vendor_key: str) -> Optional[str]:
    defaults = {
        "siliconflow": "https://api.siliconflow.cn/v1",
    }
    return defaults.get(vendor_key)


def _resolve_vendor_credential(db: Session, vendor: str) -> Optional[VendorCredential]:
    vendor_key = _canonical_vendor_key(vendor)
    return db.query(VendorCredential).filter(VendorCredential.vendor_key == vendor_key).first()


def _build_siliconflow_voice_key(voice: Voice, model: str) -> str:
    if voice.voice_key:
        return voice.voice_key
    if ":" in voice.id:
        return voice.id
    return f"{model}:{voice.id}"


@router.get("")
def list_voices(
    vendor: Optional[str] = None,
    language: Optional[str] = None,
    gender: Optional[str] = None,
    page: int = 1,
    limit: int = 50,
    db: Session = Depends(get_db)
):
    """获取声音库列表"""
    query = db.query(Voice)
    if vendor:
        query = query.filter(Voice.vendor == vendor)
    if language:
        query = query.filter(Voice.language == language)
    if gender:
        query = query.filter(Voice.gender == gender)

    total = query.count()
    voices = query.order_by(Voice.created_at.desc()) \
        .offset((page - 1) * limit).limit(limit).all()
    return {"total": total, "page": page, "limit": limit, "list": voices}


@router.post("", response_model=VoiceOut)
def create_voice(data: VoiceCreate, db: Session = Depends(get_db)):
    """创建声音"""
    vendor = data.vendor.strip()
    model = data.model
    voice_key = data.voice_key

    if _is_siliconflow_vendor(vendor):
        model = model or SILICONFLOW_DEFAULT_MODEL
        if not voice_key:
            raw_id = (data.id or data.name).strip()
            voice_key = raw_id if ":" in raw_id else f"{model}:{raw_id}"

    voice = Voice(
        id=data.id or str(uuid.uuid4())[:8],
        user_id=1,
        name=data.name,
        vendor=vendor,
        gender=data.gender,
        language=data.language,
        description=data.description,
        model=model,
        voice_key=voice_key,
        speed=data.speed,
        gain=data.gain,
        pitch=data.pitch,
        enabled=data.enabled,
    )
    db.add(voice)
    db.commit()
    db.refresh(voice)
    return voice


@router.get("/{id}", response_model=VoiceOut)
def get_voice(id: str, db: Session = Depends(get_db)):
    """获取单个声音详情"""
    voice = db.query(Voice).filter(Voice.id == id).first()
    if not voice:
        raise HTTPException(status_code=404, detail="Voice not found")
    return voice


@router.put("/{id}", response_model=VoiceOut)
def update_voice(id: str, data: VoiceUpdate, db: Session = Depends(get_db)):
    """更新声音"""
    voice = db.query(Voice).filter(Voice.id == id).first()
    if not voice:
        raise HTTPException(status_code=404, detail="Voice not found")

    update_data = data.model_dump(exclude_unset=True)
    if "vendor" in update_data and update_data["vendor"] is not None:
        update_data["vendor"] = update_data["vendor"].strip()

    vendor_for_defaults = update_data.get("vendor", voice.vendor)
    if _is_siliconflow_vendor(vendor_for_defaults):
        model = update_data.get("model") or voice.model or SILICONFLOW_DEFAULT_MODEL
        voice_key = update_data.get("voice_key") or voice.voice_key
        update_data["model"] = model
        update_data["voice_key"] = voice_key or _build_siliconflow_voice_key(voice, model)

    for field, value in update_data.items():
        setattr(voice, field, value)

    db.commit()
    db.refresh(voice)
    return voice


@router.delete("/{id}")
def delete_voice(id: str, db: Session = Depends(get_db)):
    """删除声音"""
    voice = db.query(Voice).filter(Voice.id == id).first()
    if not voice:
        raise HTTPException(status_code=404, detail="Voice not found")
    db.delete(voice)
    db.commit()
    return {"message": "Deleted successfully"}


@router.get("/vendors/credentials")
def list_vendor_credentials(db: Session = Depends(get_db)):
    items = db.query(VendorCredential).order_by(VendorCredential.updated_at.desc()).all()
    return {"list": items, "total": len(items)}


@router.get("/vendors/credentials/{vendor_key}", response_model=VendorCredentialOut)
def get_vendor_credential(vendor_key: str, db: Session = Depends(get_db)):
    key = _canonical_vendor_key(vendor_key)
    item = db.query(VendorCredential).filter(VendorCredential.vendor_key == key).first()
    if not item:
        raise HTTPException(status_code=404, detail="Vendor credential not found")
    return item


@router.put("/vendors/credentials/{vendor_key}", response_model=VendorCredentialOut)
def upsert_vendor_credential(vendor_key: str, data: VendorCredentialUpsert, db: Session = Depends(get_db)):
    key = _canonical_vendor_key(vendor_key)
    item = db.query(VendorCredential).filter(VendorCredential.vendor_key == key).first()

    if item:
        item.vendor_name = data.vendor_name or item.vendor_name
        item.api_key = data.api_key
        item.base_url = data.base_url
        item.updated_at = datetime.utcnow()
    else:
        item = VendorCredential(
            vendor_key=key,
            vendor_name=data.vendor_name or vendor_key,
            api_key=data.api_key,
            base_url=data.base_url,
        )
        db.add(item)

    db.commit()
    db.refresh(item)
    return item


@router.delete("/vendors/credentials/{vendor_key}")
def delete_vendor_credential(vendor_key: str, db: Session = Depends(get_db)):
    key = _canonical_vendor_key(vendor_key)
    item = db.query(VendorCredential).filter(VendorCredential.vendor_key == key).first()
    if not item:
        raise HTTPException(status_code=404, detail="Vendor credential not found")
    db.delete(item)
    db.commit()
    return {"message": "Deleted successfully"}


@router.post("/{id}/preview", response_model=VoicePreviewResponse)
def preview_voice(id: str, data: VoicePreviewRequest, db: Session = Depends(get_db)):
    """试听指定声音，基于 OpenAI-compatible /audio/speech 接口。"""
    voice = db.query(Voice).filter(Voice.id == id).first()
    if not voice:
        raise HTTPException(status_code=404, detail="Voice not found")

    text = data.text.strip()
    if not text:
        raise HTTPException(status_code=400, detail="Preview text cannot be empty")

    credential = _resolve_vendor_credential(db, voice.vendor)
    api_key = (data.api_key or "").strip()
    if not api_key and credential:
        api_key = credential.api_key
    if not api_key:
        api_key = os.getenv("SILICONFLOW_API_KEY") if _is_siliconflow_vendor(voice.vendor) else ""
    if not api_key:
        raise HTTPException(status_code=400, detail=f"Vendor API key is required for {voice.vendor}")

    model = voice.model or SILICONFLOW_DEFAULT_MODEL
    vendor_key = _canonical_vendor_key(voice.vendor)
    base_url = (credential.base_url.strip() if credential and credential.base_url else "") or _default_tts_base_url(vendor_key)
    if not base_url:
        raise HTTPException(status_code=400, detail=f"Vendor base_url is required for {voice.vendor}")
    tts_api_url = f"{base_url.rstrip('/')}/audio/speech"

    payload = {
        "model": model,
        "input": text,
        "voice": voice.voice_key or _build_siliconflow_voice_key(voice, model),
        "response_format": "mp3",
        "speed": data.speed if data.speed is not None else voice.speed,
    }

    try:
        with httpx.Client(timeout=45.0) as client:
            response = client.post(
                tts_api_url,
                headers={"Authorization": f"Bearer {api_key}", "Content-Type": "application/json"},
                json=payload,
            )
    except Exception as exc:
        raise HTTPException(status_code=502, detail=f"TTS request failed: {exc}") from exc

    if response.status_code != 200:
        detail = response.text
        try:
            detail_json = response.json()
            detail = detail_json.get("error", {}).get("message") or detail_json.get("detail") or detail
        except Exception:
            pass
        raise HTTPException(status_code=502, detail=f"TTS vendor error: {detail}")

    audio_base64 = base64.b64encode(response.content).decode("utf-8")
    return VoicePreviewResponse(success=True, audio_url=f"data:audio/mpeg;base64,{audio_base64}")