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

from app.database import get_db
from app.models.setting import AiSetting
from app.schemas.setting import AiSettingCreate
from app.routers.admin import get_current_admin_user
from app.models.user import AdminUser

router = APIRouter(prefix="/admin/settings", tags=["AI设置"])


@router.get("", response_model=list)
def list_settings(
    db: Session = Depends(get_db),
    current_user: AdminUser = Depends(get_current_admin_user),
):
    """列出所有 AI 配置"""
    return db.query(AiSetting).order_by(AiSetting.created_at.desc()).all()


@router.get("/active")
def get_active_setting(
    db: Session = Depends(get_db),
):
    """获取当前激活的 AI 配置（无需认证，供爬虫/优化器使用）"""
    setting = db.query(AiSetting).filter(AiSetting.is_active == True).first()
    if not setting:
        from app.routers.settings import _ensure_default_settings
        setting = _ensure_default_settings(db)
    return setting


@router.post("")
def create_setting(
    setting: AiSettingCreate,
    db: Session = Depends(get_db),
    current_user: AdminUser = Depends(get_current_admin_user),
):
    """新建 AI 配置"""
    db_setting = AiSetting(**setting.model_dump())
    db.add(db_setting)
    db.commit()
    db.refresh(db_setting)
    return db_setting


@router.put("/{setting_id}")
def update_setting(
    setting_id: int,
    setting: AiSettingCreate,
    db: Session = Depends(get_db),
    current_user: AdminUser = Depends(get_current_admin_user),
):
    """更新 AI 配置"""
    db_setting = db.query(AiSetting).filter(AiSetting.id == setting_id).first()
    if not db_setting:
        raise HTTPException(status_code=404, detail="配置不存在")
    for key, value in setting.model_dump().items():
        setattr(db_setting, key, value)
    db.commit()
    db.refresh(db_setting)
    return db_setting


@router.put("/{setting_id}/toggle")
def toggle_setting(
    setting_id: int,
    db: Session = Depends(get_db),
    current_user: AdminUser = Depends(get_current_admin_user),
):
    """切换激活状态（只能有一个活跃）"""
    db_setting = db.query(AiSetting).filter(AiSetting.id == setting_id).first()
    if not db_setting:
        raise HTTPException(status_code=404, detail="配置不存在")

    # 先全部设为非活跃
    db.query(AiSetting).update({AiSetting.is_active: False})
    db_setting.is_active = True
    db.commit()
    return {"message": "已激活", "id": setting_id}


@router.delete("/{setting_id}")
def delete_setting(
    setting_id: int,
    db: Session = Depends(get_db),
    current_user: AdminUser = Depends(get_current_admin_user),
):
    """删除 AI 配置"""
    db_setting = db.query(AiSetting).filter(AiSetting.id == setting_id).first()
    if not db_setting:
        raise HTTPException(status_code=404, detail="配置不存在")
    db.delete(db_setting)
    db.commit()
    return {"message": "删除成功"}


def _ensure_default_settings(db: Session) -> AiSetting:
    """当没有激活配置时，创建一条默认配置"""
    existing = db.query(AiSetting).first()
    if existing:
        existing.is_active = True
        db.commit()
        return existing

    defaults = AiSetting(
        is_active=True,
        # 默认提示词会在 main.py 迁移时填充
    )
    db.add(defaults)
    db.commit()
    db.refresh(defaults)
    return defaults