"""
LinkSyncServer - Admin Endpoints
"""

import uuid
from typing import List, Optional

from fastapi import APIRouter, HTTPException, Query, status
from pydantic import BaseModel, EmailStr, Field

from api.endpoints.auth import hash_password, require_admin
from models.base import AuditLog, Bookmark, Collection, Tag, User, get_session

router = APIRouter(prefix="/api/admin", tags=["Admin"])


class UserCreate(BaseModel):
    username: str
    email: EmailStr
    password: str
    role: str = Field(default="user", pattern="^(admin|user)$")
    is_active: bool = True


class UserUpdate(BaseModel):
    email: Optional[EmailStr] = None
    role: Optional[str] = Field(None, pattern="^(admin|user)$")
    is_active: Optional[bool] = None
    password: Optional[str] = None


class SettingsUpdate(BaseModel):
    debug: Optional[bool] = None
    cors_origins: Optional[str] = None


@router.get("/users", response_model=List[dict])
async def list_users(
    limit: int = Query(20, le=100, ge=1),
    offset: int = Query(0, ge=0),
    current_admin: dict = require_admin,
):
    db = get_session()
    try:
        users = db.query(User).order_by(User.created_at.desc()).offset(offset).limit(limit).all()
        return [u.to_dict() for u in users]
    finally:
        db.close()


@router.post("/users", response_model=dict, status_code=status.HTTP_201_CREATED)
async def create_user(
    data: UserCreate,
    current_admin: dict = require_admin,
):
    db = get_session()
    try:
        existing = db.query(User).filter(
            (User.username == data.username) | (User.email == data.email)
        ).first()
        if existing:
            raise HTTPException(status_code=400, detail="Username or email already exists")

        user = User(
            id=str(uuid.uuid4()),
            username=data.username,
            email=data.email,
            password_hash=hash_password(data.password),
            role=data.role,
            is_active=data.is_active,
        )
        db.add(user)
        db.commit()
        db.refresh(user)
        return user.to_dict()
    finally:
        db.close()


@router.get("/users/{user_id}", response_model=dict)
async def get_user(
    user_id: str,
    current_admin: dict = require_admin,
):
    db = get_session()
    try:
        user = db.query(User).filter(User.id == user_id).first()
        if not user:
            raise HTTPException(status_code=404, detail="User not found")
        return user.to_dict()
    finally:
        db.close()


@router.put("/users/{user_id}", response_model=dict)
async def update_user(
    user_id: str,
    data: UserUpdate,
    current_admin: dict = require_admin,
):
    db = get_session()
    try:
        user = db.query(User).filter(User.id == user_id).first()
        if not user:
            raise HTTPException(status_code=404, detail="User not found")

        update_data = data.model_dump(exclude_unset=True)
        if "password" in update_data:
            update_data["password_hash"] = hash_password(update_data.pop("password"))

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

        db.commit()
        db.refresh(user)
        return user.to_dict()
    finally:
        db.close()


@router.delete("/users/{user_id}", response_model=dict)
async def delete_user(
    user_id: str,
    current_admin: dict = require_admin,
):
    db = get_session()
    try:
        user = db.query(User).filter(User.id == user_id).first()
        if not user:
            raise HTTPException(status_code=404, detail="User not found")
        if user.username == current_admin.get("username"):
            raise HTTPException(status_code=400, detail="Cannot delete yourself")

        db.delete(user)
        db.commit()
        return {"message": "User deleted successfully", "deleted_id": user_id}
    finally:
        db.close()


@router.get("/stats", response_model=dict)
async def get_system_stats(current_admin: dict = require_admin):
    db = get_session()
    try:
        return {
            "total_users": db.query(User).count(),
            "total_bookmarks": db.query(Bookmark).count(),
            "total_collections": db.query(Collection).count(),
            "total_tags": db.query(Tag).count(),
            "total_audit_logs": db.query(AuditLog).count(),
        }
    finally:
        db.close()


@router.get("/audit", response_model=List[dict])
async def get_audit_log(
    limit: int = Query(50, le=200, ge=1),
    offset: int = Query(0, ge=0),
    entity_type: Optional[str] = Query(None),
    action: Optional[str] = Query(None),
    current_admin: dict = require_admin,
):
    db = get_session()
    try:
        query = db.query(AuditLog)
        if entity_type:
            query = query.filter(AuditLog.entity_type == entity_type)
        if action:
            query = query.filter(AuditLog.action == action)
        logs = query.order_by(AuditLog.created_at.desc()).offset(offset).limit(limit).all()
        return [
            {
                "id": log.id,
                "user_id": log.user_id,
                "action": log.action,
                "entity_type": log.entity_type,
                "entity_id": log.entity_id,
                "old_value": log.old_value,
                "new_value": log.new_value,
                "ip_address": log.ip_address,
                "created_at": log.created_at.isoformat() if log.created_at else None,
            }
            for log in logs
        ]
    finally:
        db.close()