import { Request, Response, NextFunction } from "express";
import { z } from "zod";
import { db } from "@server/db";
import { resources, userResources, userSites } from "@server/db";
import { and, eq } from "drizzle-orm";
import response from "@server/lib/response";
import HttpCode from "@server/types/HttpCode";
import createHttpError from "http-errors";
import logger from "@server/logger";
import { fromError } from "zod-validation-error";

const removeUserSiteParamsSchema = z
    .object({
        userId: z.string()
    })
    .strict();

const removeUserSiteSchema = z
    .object({
        siteId: z.number().int().positive()
    })
    .strict();

export async function removeUserSite(
    req: Request,
    res: Response,
    next: NextFunction
): Promise<any> {
    try {
        const parsedParams = removeUserSiteParamsSchema.safeParse(req.params);
        if (!parsedParams.success) {
            return next(
                createHttpError(
                    HttpCode.BAD_REQUEST,
                    fromError(parsedParams.error).toString()
                )
            );
        }

        const { userId } = parsedParams.data;

        const parsedBody = removeUserSiteSchema.safeParse(req.body);
        if (!parsedBody.success) {
            return next(
                createHttpError(
                    HttpCode.BAD_REQUEST,
                    fromError(parsedBody.error).toString()
                )
            );
        }

        const { siteId } = parsedBody.data;

        await db.transaction(async (trx) => {
            const deletedUserSite = await trx
                .delete(userSites)
                .where(
                    and(
                        eq(userSites.userId, userId),
                        eq(userSites.siteId, siteId)
                    )
                )
                .returning();

            if (deletedUserSite.length === 0) {
                return next(
                    createHttpError(
                        HttpCode.NOT_FOUND,
                        `Site with ID ${siteId} not found for user with ID ${userId}`
                    )
                );
            }

            const siteResources = await trx
                .select()
                .from(resources)
                .where(eq(resources.siteId, siteId));

            for (const resource of siteResources) {
                await trx
                    .delete(userResources)
                    .where(
                        and(
                            eq(userResources.userId, userId),
                            eq(userResources.resourceId, resource.resourceId)
                        )
                    )
                    .returning();
            }
        });

        return response(res, {
            data: null,
            success: true,
            error: false,
            message: "Site removed from user successfully",
            status: HttpCode.OK
        });
    } catch (error) {
        logger.error(error);
        return next(
            createHttpError(HttpCode.INTERNAL_SERVER_ERROR, "An error occurred")
        );
    }
}