/*
 * GET users listing.
 */
import express = require('express');
const router = express.Router();
import Security from '../src/Security';
import { ILDAPManager } from '../src/ldapInterface';
import LDAPEntry from '../src/LDAPEntry';
import RouterUtils from '../src/RouterUtils';
import ConfigManager, { LDAPAttribute, LDAPCategory } from '../src/ConfigLoader';

function GetCurrentCategory(req: express.Request, defaultResult: LDAPCategory): LDAPCategory|null {
    if (!req.query["category"])
        return null;
    let query = Array.isArray(req.query["category"]) ? req.query["category"][0] : req.query["category"];
    return LinkToCategory(query.toString()) || defaultResult;
}

function LinkToCategory(query: string): LDAPCategory | null {
    return ConfigManager.GetInstance().GetCategoryByName(query);
}

function CategoryToLink(category: LDAPCategory): string {
    return category.GetName();
}

function DnToLink(dn: string): string {
    return dn.replace(new RegExp("=", "g"), "-").replace(new RegExp("[^a-zA-Z\-]", "g"), "_");
}

router.get('/', (req: express.Request, res: express.Response) => {
    if (!req.isUserLogged)
        return RouterUtils.Redirect(res, "/login");
    req.ldapManager.GetInstance().then((ldap: ILDAPManager): void => {
        ldap.GetTree().then(root => {
            let categories = ConfigManager.GetInstance().GetCategories();
            let category = GetCurrentCategory(req, categories[0]);

            if (category == null) {
                res.render("index", {
                    tree: root.GetChildren()[0],
                    rootSrc: "?category=" + CategoryToLink(categories[0])
                });
            } else {
                let session = Security.GetSession(req);

                ldap.ListEntries(category).then(items => {
                    res.render("category", {
                        csrf: session ? session.GetCSRFToken() : "",
                        categoryName: category?.GetName(),
                        allCategories: categories.map((i) => { return { name: i.GetName(), lnk: "?category=" + CategoryToLink(i) } }),
                        items: items,
                        attributes: category?.GetAttributes(),
                        DnToLnk: DnToLink,
                        GetAttributeLink: function (attr: LDAPAttribute, entityDn: string) {
                            if (attr.type.startsWith("entry")) {
                                let link = attr.type.split("#", 2)[1];
                                if (link)
                                    return "?category=" + link + "#" + DnToLink(entityDn);
                            }
                            return null;
                        },
                        GetAttributeValue: function (user: LDAPEntry, attribute: LDAPAttribute) {
                            return user.GetAttributeByName(attribute.name);
                        }
                    });
                });
			}
        });
    });
});

export default router;