"""
Admin panel routes for Ohm Stream Downloader API.
"""

from datetime import datetime
from typing import Optional, List

from fastapi import APIRouter, Depends, HTTPException, Request, Response
from fastapi.templating import Jinja2Templates
from sqlmodel import Session, select

from app.database import get_session, engine
from app.models.auth import User, UserTable
from app.routers.router_auth import get_current_user_from_token

router = APIRouter(prefix="/api/admin", tags=["admin"])
templates = Jinja2Templates(directory="templates")


async def require_admin(current_user: User = Depends(get_current_user_from_token)) -> User:
    """Dependency that requires the current user to be an admin."""
    if not current_user.is_admin:
        raise HTTPException(status_code=403, detail="Admin access required")
    return current_user


@router.get("/users")
async def list_users(
    current_user: User = Depends(require_admin),
):
    """List all users (admin only)"""
    with Session(engine) as session:
        statement = select(UserTable)
        users = session.exec(statement).all()
        return {
            "users": [
                {
                    "id": u.id,
                    "username": u.username,
                    "email": u.email,
                    "full_name": u.full_name,
                    "is_active": u.is_active,
                    "is_admin": u.is_admin,
                    "created_at": u.created_at.isoformat() if u.created_at else None,
                    "last_login": u.last_login.isoformat() if u.last_login else None,
                }
                for u in users
            ],
            "total": len(users),
        }


@router.get("/stats")
async def get_admin_stats(
    current_user: User = Depends(require_admin),
):
    """Get admin dashboard statistics"""
    from app.download_manager import DownloadManager
    from main import download_manager

    with Session(engine) as session:
        total_users = len(session.exec(select(UserTable)).all())
        active_users = len(session.exec(select(UserTable).where(UserTable.is_active == True)).all())
        admin_users = len(session.exec(select(UserTable).where(UserTable.is_admin == True)).all())

    tasks = download_manager.get_all_tasks()
    total_downloads = len(tasks)
    completed_downloads = len([t for t in tasks if t.status == "completed"])
    active_downloads = len([t for t in tasks if t.status in ("downloading", "pending")])

    return {
        "users": {
            "total": total_users,
            "active": active_users,
            "admins": admin_users,
        },
        "downloads": {
            "total": total_downloads,
            "completed": completed_downloads,
            "active": active_downloads,
        },
    }


@router.put("/users/{user_id}/toggle-active")
async def toggle_user_active(
    user_id: str,
    response: Response,
    current_user: User = Depends(require_admin),
):
    """Activate or deactivate a user"""
    with Session(engine) as session:
        user = session.exec(select(UserTable).where(UserTable.id == user_id)).first()
        if not user:
            raise HTTPException(status_code=404, detail="User not found")
        if user.id == current_user.id:
            raise HTTPException(status_code=400, detail="Cannot modify your own account")
        user.is_active = not user.is_active
        session.add(user)
        session.commit()
        status = "active" if user.is_active else "inactive"
        response.headers["HX-Trigger"] = f'{{"show-toast": {{"message": "User {user.username} is now {status}", "type": "success"}}}}'
        return {"id": user_id, "is_active": user.is_active}


@router.put("/users/{user_id}/toggle-admin")
async def toggle_user_admin(
    user_id: str,
    response: Response,
    current_user: User = Depends(require_admin),
):
    """Promote or demote a user to/from admin"""
    with Session(engine) as session:
        user = session.exec(select(UserTable).where(UserTable.id == user_id)).first()
        if not user:
            raise HTTPException(status_code=404, detail="User not found")
        if user.id == current_user.id:
            raise HTTPException(status_code=400, detail="Cannot modify your own admin status")
        user.is_admin = not user.is_admin
        session.add(user)
        session.commit()
        role = "admin" if user.is_admin else "user"
        response.headers["HX-Trigger"] = f'{{"show-toast": {{"message": "{user.username} is now {role}", "type": "success"}}}}'
        return {"id": user_id, "is_admin": user.is_admin}


@router.delete("/users/{user_id}")
async def delete_user(
    user_id: str,
    response: Response,
    current_user: User = Depends(require_admin),
):
    """Delete a user"""
    with Session(engine) as session:
        user = session.exec(select(UserTable).where(UserTable.id == user_id)).first()
        if not user:
            raise HTTPException(status_code=404, detail="User not found")
        if user.id == current_user.id:
            raise HTTPException(status_code=400, detail="Cannot delete your own account")
        username = user.username
        session.delete(user)
        session.commit()
        response.headers["HX-Trigger"] = f'{{"show-toast": {{"message": "User {username} deleted", "type": "info"}}}}'
        return {"deleted": user_id}


@router.get("/ui")
async def get_admin_ui(
    request: Request,
    current_user: Optional[User] = Depends(get_current_user_from_token),
):
    """Get admin panel UI"""
    if current_user is None or not current_user.is_admin:
        from app.routers.router_auth import get_optional_user
        return templates.TemplateResponse(
            "components/login_prompt.html", {"request": request}
        )
    
    with Session(engine) as session:
        users = session.exec(select(UserTable)).all()
    
    return templates.TemplateResponse(
        "components/admin_panel.html",
        {"request": request, "users": users, "current_user": current_user},
    )