import { Request, Response, NextFunction } from "express";
import { z } from "zod";
import { db } from "@server/db";
import { userOrgs, roles } from "@server/db";
import { eq, and, inArray } 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";
import { OpenAPITags, registry } from "@server/openApi";

const setUserRolesParamsSchema = z
    .object({
        orgId: z.string(),
        userId: z.string()
    })
    .strict();

const setUserRolesBodySchema = z.object({
    roleIds: z.array(z.number().int()).min(1)
});

export type SetUserRolesResponse = z.infer<typeof setUserRolesBodySchema>;

registry.registerPath({
    method: "post",
    path: "/org/{orgId}/user/{userId}/roles",
    description: "Set the roles of an user",
    tags: [OpenAPITags.Role, OpenAPITags.User],
    request: {
        params: setUserRolesParamsSchema,
        body: {
            content: { "application/json": { schema: setUserRolesBodySchema } }
        }
    },
    responses: {}
});

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

        const parsedBody = setUserRolesBodySchema.safeParse(req.body);
        if (!parsedBody.success) {
            return next(
                createHttpError(
                    HttpCode.BAD_REQUEST,
                    fromError(parsedBody.error).toString()
                )
            );
        }
        let { roleIds: newRoles } = parsedBody.data;
        newRoles = [...new Set(newRoles)];
        newRoles.sort((a, b) => a - b);
        if (newRoles.length === 0) {
            return next(
                createHttpError(
                    HttpCode.BAD_REQUEST,
                    "You need to set at least 1 role"
                )
            );
        }

        if ((req.userOrg?.orgId || req.apiKeyOrg?.orgId) !== orgId) {
            return next(
                createHttpError(
                    HttpCode.FORBIDDEN,
                    "You do not have access to this organization"
                )
            );
        }

        const existingRoles = await db
            .select()
            .from(userOrgs)
            .where(and(eq(userOrgs.userId, userId), eq(userOrgs.orgId, orgId)))
            .orderBy(userOrgs.roleId);

        if (existingRoles.length === 0) {
            return next(
                createHttpError(
                    HttpCode.NOT_FOUND,
                    "User not found or does not belong to the specified organization"
                )
            );
        }

        if (existingRoles[0].isOwner) {
            return next(
                createHttpError(
                    HttpCode.FORBIDDEN,
                    "Cannot change the role of the owner of the organization"
                )
            );
        }

        if (
            existingRoles.length === newRoles.length &&
            existingRoles.every((r, i) => r.roleId === newRoles[i])
        ) {
            return response(res, {
                data: { roles: newRoles },
                success: true,
                error: false,
                message: "User roles unchanged",
                status: HttpCode.OK
            });
        }

        const rolesToCheck = newRoles.filter(
            (r) => !existingRoles.some((er) => er.roleId === r)
        );
        if (rolesToCheck.length > 0) {
            const roleChkRes = await db
                .select()
                .from(roles)
                .where(
                    and(
                        eq(roles.orgId, orgId),
                        inArray(roles.roleId, rolesToCheck)
                    )
                );
            if (roleChkRes.length !== rolesToCheck.length) {
                return next(
                    createHttpError(
                        HttpCode.NOT_FOUND,
                        "Role not found or does not belong to the specified organization"
                    )
                );
            }
        }

        await db.transaction(async (trx) => {
            await trx
                .delete(userOrgs)
                .where(
                    and(eq(userOrgs.userId, userId), eq(userOrgs.orgId, orgId))
                );
            const newValues = newRoles.map((roleId) => ({
                userId,
                orgId,
                roleId,
                isOwner: false
            }));
            await trx.insert(userOrgs).values(newValues);
        });

        return response(res, {
            data: { roles: newRoles },
            success: true,
            error: false,
            message: "User roles set successfully",
            status: HttpCode.OK
        });
    } catch (error) {
        logger.error(error);
        return next(
            createHttpError(HttpCode.INTERNAL_SERVER_ERROR, "An error occurred")
        );
    }
}