import { Request, Response, NextFunction } from 'express';
import { z } from 'zod';
import { db } from '@server/db';
import { users } from '@server/db/schema';
import response from "@server/utils/response";
import HttpCode from '@server/types/HttpCode';
import createHttpError from 'http-errors';
import { sql } from 'drizzle-orm';
import { ActionsEnum, checkUserActionPermission } from '@server/auth/actions';
import logger from '@server/logger';

const listUsersSchema = z.object({
    limit: z.string().optional().transform(Number).pipe(z.number().int().positive().default(10)),
    offset: z.string().optional().transform(Number).pipe(z.number().int().nonnegative().default(0)),
});

export async function listUsers(req: Request, res: Response, next: NextFunction): Promise<any> {
    try {
        const parsedQuery = listUsersSchema.safeParse(req.query);
        if (!parsedQuery.success) {
            return next(
                createHttpError(
                    HttpCode.BAD_REQUEST,
                    parsedQuery.error.errors.map(e => e.message).join(', ')
                )
            );
        }

        const { limit, offset } = parsedQuery.data;

        // Check if the user has permission to list sites
        const hasPermission = await checkUserActionPermission(ActionsEnum.listUsers, req);
        if (!hasPermission) {
            return next(createHttpError(HttpCode.FORBIDDEN, 'User does not have permission to list sites'));
        }

        const usersList = await db.select()
            .from(users)
            .limit(limit)
            .offset(offset);

        const totalCountResult = await db
            .select({ count: sql<number>`cast(count(*) as integer)` })
            .from(users);
        const totalCount = totalCountResult[0].count;

        // Remove passwordHash from each user object
        const usersWithoutPassword = usersList.map(({ passwordHash, ...userWithoutPassword }) => userWithoutPassword);

        return response(res, {
            data: {
                users: usersWithoutPassword,
                pagination: {
                    total: totalCount,
                    limit,
                    offset,
                },
            },
            success: true,
            error: false,
            message: "Users retrieved successfully",
            status: HttpCode.OK,
        });
    } catch (error) {
        logger.error(error);
        return next(createHttpError(HttpCode.INTERNAL_SERVER_ERROR, "An error occurred..."));
    }
}