import uuid
import logging
from fastapi import APIRouter, Depends, HTTPException
from sqlalchemy import select
from sqlalchemy.ext.asyncio import AsyncSession
from database import get_db
from models import ModelProvider, ModelInstance
from dependencies import get_current_user

logger = logging.getLogger(__name__)
router = APIRouter(prefix="/api/model-providers", tags=["模型供应商"])


@router.get("")
async def list_providers(db: AsyncSession = Depends(get_db), user=Depends(get_current_user)):
    result = await db.execute(
        select(ModelProvider).order_by(ModelProvider.created_at.desc())
    )
    return {
        "code": 200,
        "data": [
            {
                "id": str(p.id),
                "name": p.name,
                "provider_type": p.provider_type,
                "base_url": p.base_url,
                "is_active": p.is_active,
                "created_at": p.created_at.isoformat() if p.created_at else "",
            }
            for p in result.scalars().all()
        ],
    }


@router.post("")
async def create_provider(payload: dict, db: AsyncSession = Depends(get_db), user=Depends(get_current_user)):
    existing = await db.execute(
        select(ModelProvider).where(ModelProvider.base_url == payload.get("base_url", ""))
    )
    if existing.scalars().first():
        raise HTTPException(400, "相同 base_url 的供应商已存在")

    p = ModelProvider(
        name=payload["name"],
        provider_type=payload["provider_type"],
        base_url=payload.get("base_url", ""),
        api_key=payload.get("api_key", ""),
        extra_config=payload.get("extra_config", {}),
    )
    db.add(p)
    await db.commit()
    return {"code": 200, "data": {"id": str(p.id)}}


@router.put("/{provider_id}")
async def update_provider(provider_id: str, payload: dict, db: AsyncSession = Depends(get_db), user=Depends(get_current_user)):
    p = await db.get(ModelProvider, uuid.UUID(provider_id))
    if not p:
        raise HTTPException(404, "供应商不存在")

    p.name = payload.get("name", p.name)
    p.base_url = payload.get("base_url", p.base_url)
    p.api_key = payload.get("api_key", p.api_key)
    p.provider_type = payload.get("provider_type", p.provider_type)
    p.extra_config = payload.get("extra_config", p.extra_config)
    p.is_active = payload.get("is_active", p.is_active)
    await db.commit()
    return {"code": 200, "data": {"id": str(p.id)}}


@router.delete("/{provider_id}")
async def delete_provider(provider_id: str, db: AsyncSession = Depends(get_db), user=Depends(get_current_user)):
    p = await db.get(ModelProvider, uuid.UUID(provider_id))
    if not p:
        raise HTTPException(404, "供应商不存在")
    await db.delete(p)
    await db.commit()
    return {"code": 200, "message": "已删除"}


@router.get("/models/all")
async def list_all_models(db: AsyncSession = Depends(get_db), user=Depends(get_current_user)):
    result = await db.execute(
        select(ModelInstance)
        .where(ModelInstance.is_active == True)
        .order_by(ModelInstance.model_type, ModelInstance.model_name)
    )
    return {
        "code": 200,
        "data": [
            {
                "id": str(m.id),
                "model_name": m.model_name,
                "model_type": m.model_type,
                "display_name": m.display_name,
            }
            for m in result.scalars().all()
        ],
    }


@router.get("/{provider_id}/models")
async def list_models(provider_id: str, db: AsyncSession = Depends(get_db), user=Depends(get_current_user)):
    result = await db.execute(
        select(ModelInstance)
        .where(ModelInstance.provider_id == uuid.UUID(provider_id))
        .order_by(ModelInstance.model_type, ModelInstance.model_name)
    )
    return {
        "code": 200,
        "data": [
            {
                "id": str(m.id),
                "provider_id": str(m.provider_id),
                "model_name": m.model_name,
                "model_type": m.model_type,
                "display_name": m.display_name,
                "capabilities": m.capabilities,
                "default_params": m.default_params,
                "is_default": m.is_default,
                "is_active": m.is_active,
            }
            for m in result.scalars().all()
        ],
    }


@router.post("/{provider_id}/models")
async def create_model(provider_id: str, payload: dict, db: AsyncSession = Depends(get_db), user=Depends(get_current_user)):
    p = await db.get(ModelProvider, uuid.UUID(provider_id))
    if not p:
        raise HTTPException(404, "供应商不存在")

    existing = await db.execute(
        select(ModelInstance).where(
            ModelInstance.provider_id == uuid.UUID(provider_id),
            ModelInstance.model_name == payload["model_name"],
        )
    )
    if existing.scalars().first():
        raise HTTPException(400, "相同名称的模型已存在")

    m = ModelInstance(
        provider_id=uuid.UUID(provider_id),
        model_name=payload["model_name"],
        model_type=payload["model_type"],
        display_name=payload.get("display_name", payload["model_name"]),
        capabilities=payload.get("capabilities", {}),
        default_params=payload.get("default_params", {}),
        is_default=payload.get("is_default", False),
    )
    db.add(m)
    await db.commit()
    return {"code": 200, "data": {"id": str(m.id)}}


@router.put("/{provider_id}/models/{model_id}")
async def update_model(provider_id: str, model_id: str, payload: dict, db: AsyncSession = Depends(get_db), user=Depends(get_current_user)):
    m = await db.get(ModelInstance, uuid.UUID(model_id))
    if not m or str(m.provider_id) != provider_id:
        raise HTTPException(404, "模型不存在")

    m.model_name = payload.get("model_name", m.model_name)
    m.model_type = payload.get("model_type", m.model_type)
    m.display_name = payload.get("display_name", m.display_name)
    m.capabilities = payload.get("capabilities", m.capabilities)
    m.default_params = payload.get("default_params", m.default_params)
    m.is_default = payload.get("is_default", m.is_default)
    m.is_active = payload.get("is_active", m.is_active)
    await db.commit()
    return {"code": 200, "data": {"id": str(m.id)}}


@router.delete("/{provider_id}/models/{model_id}")
async def delete_model(provider_id: str, model_id: str, db: AsyncSession = Depends(get_db), user=Depends(get_current_user)):
    m = await db.get(ModelInstance, uuid.UUID(model_id))
    if not m or str(m.provider_id) != provider_id:
        raise HTTPException(404, "模型不存在")
    await db.delete(m)
    await db.commit()
    return {"code": 200, "message": "已删除"}