"""系统配置路由：
- GET  /api/config/ui            公开 UI 配置（前端启动时拉取，无需登录）
- GET  /api/admin/config         管理端读取配置（admin）
- PUT  /api/admin/config         管理端保存配置（admin）
- GET  /api/admin/stats          管理端统计（admin）
"""
import json

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

from ..core.deps import get_current_user
from ..core.response import ok
from ..database import get_db
from ..models import Agent, ChatMessage, ChatSession, Project, Task, User
from ..services.chat_service import get_ui_config
from ..services.default_config import DEFAULT_UI_CONFIG

router = APIRouter(tags=["配置"])


def require_admin(user: User = Depends(get_current_user)) -> User:
    if user.role != "admin":
        raise HTTPException(status_code=403, detail="需要管理员权限")
    return user


@router.get("/config/ui")
def ui_config(db: Session = Depends(get_db)):
    """公开：前端渲染所需的界面配置。"""
    return ok(get_ui_config(db))


@router.get("/admin/config")
def get_admin_config(user: User = Depends(require_admin), db: Session = Depends(get_db)):
    from ..models import AppConfig
    row = db.get(AppConfig, "ui")
    stored = {}
    if row and row.value:
        try:
            stored = json.loads(row.value)
        except json.JSONDecodeError:
            stored = {}
    return ok({"defaults": DEFAULT_UI_CONFIG, "stored": stored, "effective": get_ui_config(db)})


class AdminConfigBody(BaseModel):
    config: dict


@router.put("/admin/config")
def put_admin_config(body: AdminConfigBody, user: User = Depends(require_admin), db: Session = Depends(get_db)):
    from ..models import AppConfig
    row = db.get(AppConfig, "ui")
    if not row:
        row = AppConfig(key="ui", value="{}")
        db.add(row)
    row.value = json.dumps(body.config, ensure_ascii=False)
    db.commit()
    return ok(get_ui_config(db), "已保存")


@router.get("/admin/stats")
def admin_stats(user: User = Depends(require_admin), db: Session = Depends(get_db)):
    return ok({
        "users": db.query(User).count(),
        "sessions": db.query(ChatSession).count(),
        "messages": db.query(ChatMessage).count(),
        "projects": db.query(Project).count(),
        "tasks": db.query(Task).count(),
        "agents": db.query(Agent).count(),
        "likes": db.query(ChatMessage).filter(ChatMessage.feedback == "like").count(),
        "dislikes": db.query(ChatMessage).filter(ChatMessage.feedback == "dislike").count(),
    })