"""User management routes."""

from __future__ import annotations

import uuid
from typing import Any

from fastapi import APIRouter, Depends, HTTPException, Query, status
from fastapi import Response
from sqlalchemy.ext.asyncio import AsyncSession

from app.core.audit import log_audit
from app.core.db import get_db
from app.core.notifications import create_notification
from app.deps import get_current_user, require_admin, get_tenant_id, get_current_user_id
from app.schemas.user import UserCreate, UserUpdate
from app.services.user_service import user_service

router = APIRouter(prefix="/api/v1/users", tags=["users"])


@router.get("")
async def list_users(
    page: int = Query(1, ge=1),
    page_size: int = Query(25, ge=1, le=100),
    search: str | None = Query(None),
    db: AsyncSession = Depends(get_db),
    current_user: dict = Depends(require_admin),
):
    """List users (admin only, paginated)."""
    tenant_id = uuid.UUID(current_user["tenant_id"])
    return await user_service.list_users(db, tenant_id, page, page_size, search)


@router.post("", status_code=status.HTTP_201_CREATED)
async def create_user(
    body: UserCreate,
    db: AsyncSession = Depends(get_db),
    current_user: dict = Depends(require_admin),
):
    """Create a new user (admin only)."""
    tenant_id = uuid.UUID(current_user["tenant_id"])
    user_id = uuid.UUID(current_user["user_id"])

    user = await user_service.create_user(
        db, tenant_id, body.email, body.name, body.password, body.role, body.is_active,
    )

    # Audit log
    await log_audit(
        db, tenant_id, user_id, "create", "user", user.id,
        changes={"email": body.email, "name": body.name, "role": body.role},
    )

    # Notification
    await create_notification(
        db, tenant_id, user.id, "info",
        "Account created",
        f"Your account has been created by {current_user['name']}.",
    )

    return {
        "id": str(user.id),
        "email": user.email,
        "name": user.name,
        "role": user.role,
        "is_active": user.is_active,
        "tenant_id": str(user.tenant_id),
    }


@router.get("/{user_id}")
async def get_user(
    user_id: str,
    db: AsyncSession = Depends(get_db),
    current_user: dict = Depends(get_current_user),
):
    """Get a single user."""
    tenant_id = uuid.UUID(current_user["tenant_id"])
    try:
        uid = uuid.UUID(user_id)
    except ValueError:
        raise HTTPException(400, detail={"detail": "Invalid user_id", "code": "invalid_id"})

    user = await user_service.get_user(db, tenant_id, uid)
    if user is None:
        raise HTTPException(404, detail={"detail": "User not found", "code": "not_found"})

    return {
        "id": str(user.id),
        "email": user.email,
        "name": user.name,
        "role": user.role,
        "is_active": user.is_active,
        "tenant_id": str(user.tenant_id),
    }


@router.patch("/{user_id}")
async def update_user(
    user_id: str,
    body: UserUpdate,
    db: AsyncSession = Depends(get_db),
    current_user: dict = Depends(require_admin),
):
    """Update a user (admin only)."""
    tenant_id = uuid.UUID(current_user["tenant_id"])
    acting_user_id = uuid.UUID(current_user["user_id"])
    try:
        uid = uuid.UUID(user_id)
    except ValueError:
        raise HTTPException(400, detail={"detail": "Invalid user_id", "code": "invalid_id"})

    changes: dict[str, Any] = {}
    if body.name is not None:
        changes["name"] = body.name
    if body.role is not None:
        changes["role"] = body.role
    if body.is_active is not None:
        changes["is_active"] = body.is_active

    user = await user_service.update_user(
        db, tenant_id, uid, body.name, body.role, body.is_active,
    )
    if user is None:
        raise HTTPException(404, detail={"detail": "User not found", "code": "not_found"})

    await log_audit(db, tenant_id, acting_user_id, "update", "user", uid, changes=changes)

    return {
        "id": str(user.id),
        "email": user.email,
        "name": user.name,
        "role": user.role,
        "is_active": user.is_active,
        "tenant_id": str(user.tenant_id),
    }


@router.delete("/{user_id}")
async def delete_user(
    user_id: str,
    db: AsyncSession = Depends(get_db),
    current_user: dict = Depends(require_admin),
):
    """Delete a user (admin only)."""
    tenant_id = uuid.UUID(current_user["tenant_id"])
    acting_user_id = uuid.UUID(current_user["user_id"])
    try:
        uid = uuid.UUID(user_id)
    except ValueError:
        raise HTTPException(400, detail={"detail": "Invalid user_id", "code": "invalid_id"})

    # Get user snapshot for audit before deletion
    user = await user_service.get_user(db, tenant_id, uid)
    if user is None:
        raise HTTPException(404, detail={"detail": "User not found", "code": "not_found"})

    success = await user_service.delete_user(db, tenant_id, uid)
    if not success:
        raise HTTPException(404, detail={"detail": "User not found", "code": "not_found"})

    await log_audit(
        db, tenant_id, acting_user_id, "delete", "user", uid,
        changes={"email": user.email, "name": user.name},
    )

    return Response(status_code=status.HTTP_204_NO_CONTENT)