from typing import Optional
from pydantic import BaseModel
from fastapi import APIRouter, Depends, HTTPException, Query
from sqlalchemy.ext.asyncio import AsyncSession
from sqlalchemy import select
from app.database import get_db
from app.api.v1.deps import get_current_user
from app.models.ai_provider import AIProvider
from app.ai.router import get_ai_router

router = APIRouter()


async def require_admin(current_user: dict = Depends(get_current_user)) -> dict:
    if current_user.get("role") != "admin":
        raise HTTPException(status_code=403, detail="Admin access required")
    return current_user


class AIProviderCreate(BaseModel):
    name: str
    provider_type: str
    api_key: Optional[str] = None
    api_secret: Optional[str] = None
    base_url: Optional[str] = None
    model_name: str = "deepseek-v4-flash"
    extra_config: Optional[dict] = None
    priority: int = 0
    enabled: bool = True


class AIProviderUpdate(BaseModel):
    name: Optional[str] = None
    api_key: Optional[str] = None
    api_secret: Optional[str] = None
    base_url: Optional[str] = None
    model_name: Optional[str] = None
    extra_config: Optional[dict] = None
    priority: Optional[int] = None
    enabled: Optional[bool] = None


PROVIDER_TYPE_LABELS = {
    "sensenova": "Sensenova (商汤)",
    "opencode_go": "OpencodeGo",
    "nvidia": "NVIDIA",
    "spark": "讯飞 Spark",
    "alibaba-mt": "阿里翻译",
}


@router.get("/ai-providers")
async def list_providers(
    page: int = Query(1, ge=1),
    size: int = Query(50, ge=1, le=100),
    _: dict = Depends(require_admin),
    db: AsyncSession = Depends(get_db),
):
    result = await db.execute(
        select(AIProvider).order_by(AIProvider.priority).offset((page - 1) * size).limit(size)
    )
    providers = result.scalars().all()
    total_result = await db.execute(select(AIProvider))
    total = len(total_result.scalars().all())
    return {
        "items": [
            {
                "id": str(p.id),
                "name": p.name,
                "provider_type": p.provider_type,
                "type_label": PROVIDER_TYPE_LABELS.get(p.provider_type, p.provider_type),
                "api_key": p.api_key[:8] + "..." if p.api_key and len(p.api_key) > 8 else (p.api_key or ""),
                "api_secret": bool(p.api_secret),
                "base_url": p.base_url,
                "model_name": p.model_name,
                "extra_config": p.extra_config,
                "priority": p.priority,
                "enabled": p.enabled,
                "created_at": p.created_at.isoformat() if p.created_at else None,
                "updated_at": p.updated_at.isoformat() if p.updated_at else None,
            }
            for p in providers
        ],
        "total": total,
        "page": page,
        "size": size,
    }


@router.post("/ai-providers")
async def create_provider(
    data: AIProviderCreate,
    _: dict = Depends(require_admin),
    db: AsyncSession = Depends(get_db),
):
    provider = AIProvider(
        name=data.name,
        provider_type=data.provider_type,
        api_key=data.api_key,
        api_secret=data.api_secret,
        base_url=data.base_url,
        model_name=data.model_name,
        extra_config=data.extra_config or {},
        priority=data.priority,
        enabled=data.enabled,
    )
    db.add(provider)
    await db.commit()
    await db.refresh(provider)
    await get_ai_router().reload_from_db(db)
    return {"id": str(provider.id), "message": "AI provider created"}


@router.put("/ai-providers/{provider_id}")
async def update_provider(
    provider_id: str,
    data: AIProviderUpdate,
    _: dict = Depends(require_admin),
    db: AsyncSession = Depends(get_db),
):
    result = await db.execute(select(AIProvider).where(AIProvider.id == provider_id))
    provider = result.scalar_one_or_none()
    if not provider:
        raise HTTPException(status_code=404, detail="AI provider not found")

    update_data = data.model_dump(exclude_unset=True)
    for key, value in update_data.items():
        setattr(provider, key, value)
    await db.commit()
    await db.refresh(provider)

    await get_ai_router().reload_from_db(db)
    return {"id": str(provider.id), "message": "AI provider updated"}


@router.delete("/ai-providers/{provider_id}")
async def delete_provider(
    provider_id: str,
    _: dict = Depends(require_admin),
    db: AsyncSession = Depends(get_db),
):
    result = await db.execute(select(AIProvider).where(AIProvider.id == provider_id))
    provider = result.scalar_one_or_none()
    if not provider:
        raise HTTPException(status_code=404, detail="AI provider not found")
    await db.delete(provider)
    await db.commit()

    await get_ai_router().reload_from_db(db)
    return {"message": "AI provider deleted"}


@router.post("/ai-providers/reload")
async def reload_providers(
    _: dict = Depends(require_admin),
    db: AsyncSession = Depends(get_db),
):
    count = await get_ai_router().reload_from_db(db)
    return {"message": f"AI providers reloaded, {count} providers active"}


@router.get("/ai-providers/status")
async def get_provider_status(
    _: dict = Depends(require_admin),
):
    router = get_ai_router()
    active = list(router.providers.keys())
    routing = router.routing_rules
    return {"active_providers": active, "routing_rules": routing, "provider_count": len(active)}