"""
Auth Admin API - Users, Groups, Permissions management
"""
from fastapi import APIRouter, HTTPException, status, Depends
from pydantic import BaseModel, Field
from app.core.auth_dependencies import require_permission
from app.core.auth_service import AuthService
from app.core.database import execute_query, execute_query_single, execute_insert, execute_update
from app.models.schemas import UserAdminCreate, UserGroupsUpdate, GroupCreate, GroupPermissionsUpdate, UserTwoFactorResetRequest
import logging

logger = logging.getLogger(__name__)

router = APIRouter()


class UserStatusUpdateRequest(BaseModel):
    is_active: bool


class UserPasswordResetRequest(BaseModel):
    new_password: str = Field(..., min_length=8, max_length=128)


@router.get("/admin/users", dependencies=[Depends(require_permission("users.manage"))])
async def list_users():
    users = execute_query(
        """
         SELECT u.user_id, u.username, u.email, u.full_name,
             u.is_active, u.is_superadmin, u.is_2fa_enabled,
                         u.telefoni_extension, u.telefoni_aktiv, u.telefoni_phone_ip, u.telefoni_phone_username,
             u.created_at, u.last_login_at,
               COALESCE(array_remove(array_agg(g.name), NULL), ARRAY[]::varchar[]) AS groups
        FROM users u
        LEFT JOIN user_groups ug ON u.user_id = ug.user_id
        LEFT JOIN groups g ON ug.group_id = g.id
        GROUP BY u.user_id
        ORDER BY u.user_id
        """
    )
    return users


@router.post("/admin/users", status_code=status.HTTP_201_CREATED, dependencies=[Depends(require_permission("users.manage"))])
async def create_user(payload: UserAdminCreate):
    existing = execute_query_single(
        "SELECT user_id FROM users WHERE username = %s OR email = %s",
        (payload.username, payload.email)
    )
    if existing:
        raise HTTPException(
            status_code=status.HTTP_409_CONFLICT,
            detail="Username or email already exists"
        )

    try:
        password_hash = AuthService.hash_password(payload.password)
    except Exception as exc:
        logger.error("❌ Password hash failed: %s", exc)
        raise HTTPException(
            status_code=status.HTTP_400_BAD_REQUEST,
            detail="Kunne ikke hashe adgangskoden"
        ) from exc
    user_id = execute_insert(
        """
        INSERT INTO users (username, email, password_hash, full_name, is_superadmin, is_active)
        VALUES (%s, %s, %s, %s, %s, %s) RETURNING user_id
        """,
        (payload.username, payload.email, password_hash, payload.full_name, payload.is_superadmin, payload.is_active)
    )

    if payload.group_ids:
        for group_id in payload.group_ids:
            execute_update(
                """
                INSERT INTO user_groups (user_id, group_id)
                VALUES (%s, %s) ON CONFLICT DO NOTHING
                """,
                (user_id, group_id)
            )

    logger.info("✅ User created via admin: %s (ID: %s)", payload.username, user_id)
    return {"user_id": user_id}


@router.put("/admin/users/{user_id}/groups", dependencies=[Depends(require_permission("users.manage"))])
async def update_user_groups(user_id: int, payload: UserGroupsUpdate):
    user = execute_query_single("SELECT user_id FROM users WHERE user_id = %s", (user_id,))
    if not user:
        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="User not found")

    execute_update("DELETE FROM user_groups WHERE user_id = %s", (user_id,))

    for group_id in payload.group_ids:
        execute_update(
            """
            INSERT INTO user_groups (user_id, group_id)
            VALUES (%s, %s) ON CONFLICT DO NOTHING
            """,
            (user_id, group_id)
        )

    return {"message": "Groups updated"}


@router.patch("/admin/users/{user_id}", dependencies=[Depends(require_permission("users.manage"))])
async def update_user_status(user_id: int, payload: UserStatusUpdateRequest):
    user = execute_query_single(
        "SELECT user_id, username FROM users WHERE user_id = %s",
        (user_id,)
    )
    if not user:
        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="User not found")

    execute_update(
        "UPDATE users SET is_active = %s, updated_at = CURRENT_TIMESTAMP WHERE user_id = %s",
        (payload.is_active, user_id)
    )

    logger.info("✅ Updated user status via admin: %s -> active=%s", user.get("username"), payload.is_active)
    return {"message": "User status updated", "user_id": user_id, "is_active": payload.is_active}


@router.post("/admin/users/{user_id}/reset-password", dependencies=[Depends(require_permission("users.manage"))])
async def admin_reset_user_password(user_id: int, payload: UserPasswordResetRequest):
    user = execute_query_single(
        "SELECT user_id, username FROM users WHERE user_id = %s",
        (user_id,)
    )
    if not user:
        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="User not found")

    try:
        password_hash = AuthService.hash_password(payload.new_password)
    except Exception as exc:
        logger.error("❌ Password hash failed for user_id=%s: %s", user_id, exc)
        raise HTTPException(status_code=status.HTTP_400_BAD_REQUEST, detail="Kunne ikke hashe adgangskoden") from exc

    execute_update(
        "UPDATE users SET password_hash = %s, updated_at = CURRENT_TIMESTAMP WHERE user_id = %s",
        (password_hash, user_id)
    )

    logger.info("✅ Password reset via admin for user: %s", user.get("username"))
    return {"message": "Password reset", "user_id": user_id}


@router.post("/admin/users/{user_id}/2fa/reset")
async def reset_user_2fa(
    user_id: int,
    payload: UserTwoFactorResetRequest,
    current_user: dict = Depends(require_permission("users.manage"))
):
    ok = AuthService.admin_reset_user_2fa(user_id)
    if not ok:
        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="User not found")

    reason = (payload.reason or "").strip()
    if reason:
        logger.info(
            "✅ Admin reset 2FA for user_id=%s by %s (reason: %s)",
            user_id,
            current_user.get("username"),
            reason
        )
    else:
        logger.info(
            "✅ Admin reset 2FA for user_id=%s by %s",
            user_id,
            current_user.get("username")
        )
    return {"message": "2FA reset"}


@router.get("/admin/groups", dependencies=[Depends(require_permission("users.manage"))])
async def list_groups():
    groups = execute_query(
        """
        SELECT g.id, g.name, g.description,
               COALESCE(array_remove(array_agg(p.code), NULL), ARRAY[]::varchar[]) AS permissions
        FROM groups g
        LEFT JOIN group_permissions gp ON g.id = gp.group_id
        LEFT JOIN permissions p ON gp.permission_id = p.id
        GROUP BY g.id
        ORDER BY g.id
        """
    )
    return groups


@router.post("/admin/groups", status_code=status.HTTP_201_CREATED, dependencies=[Depends(require_permission("permissions.manage"))])
async def create_group(payload: GroupCreate):
    existing = execute_query_single("SELECT id FROM groups WHERE name = %s", (payload.name,))
    if existing:
        raise HTTPException(status_code=status.HTTP_409_CONFLICT, detail="Group already exists")

    group_id = execute_insert(
        """
        INSERT INTO groups (name, description)
        VALUES (%s, %s) RETURNING id
        """,
        (payload.name, payload.description)
    )

    return {"group_id": group_id}


@router.put("/admin/groups/{group_id}/permissions", dependencies=[Depends(require_permission("permissions.manage"))])
async def update_group_permissions(group_id: int, payload: GroupPermissionsUpdate):
    group = execute_query_single("SELECT id FROM groups WHERE id = %s", (group_id,))
    if not group:
        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="Group not found")

    execute_update("DELETE FROM group_permissions WHERE group_id = %s", (group_id,))

    for permission_id in payload.permission_ids:
        execute_update(
            """
            INSERT INTO group_permissions (group_id, permission_id)
            VALUES (%s, %s) ON CONFLICT DO NOTHING
            """,
            (group_id, permission_id)
        )

    return {"message": "Permissions updated"}


@router.get("/admin/permissions", dependencies=[Depends(require_permission("permissions.manage"))])
async def list_permissions():
    permissions = execute_query(
        """
        SELECT id, code, description, category
        FROM permissions
        ORDER BY category, code
        """
    )
    return permissions