// Admin UI for saltcorn-idp: a read-only dashboard plus group management.
// All pages are admin-gated (role_id 1) and live under /admin/idp (CSRF-protected
// browser forms — note these are NOT under the CSRF-exempt /idp namespace).

const crypto    = require("crypto");

const constants = require("./constants");
const keys      = require("./keys");
const groups    = require("./groups");
const clients   = require("./clients");
const samlSps   = require("./saml/sps");
const serviceAccount = require("./ldap/serviceAccount");
const ldapSettings   = require("./ldap/settings");
const db        = require("@saltcorn/data/db");
const User      = require("@saltcorn/data/models/user");

const { escapeHtml }   = require("./web");
const { getEnv }       = require("./env");
const { issuerForReq } = require("./oidc/discovery");

// Saltcorn native markup primitives -- the same ones core admin pages use, so
// these pages inherit the active theme by construction.
const { mkTable, post_btn, renderForm, link, alert, tags } = require("@saltcorn/markup");
const { p, code, pre, div, span, strong } = tags;
const Form = require("@saltcorn/data/models/form");

const ADMIN_ROLE_ID = 1;


const isAdmin = (req) => {
    return !!(req && req.user && req.user.role_id === ADMIN_ROLE_ID);
};


// URL-scheme guards for admin-supplied URLs. A SAML ACS is always an http(s)
// web endpoint, so require that (a "javascript:" ACS would otherwise become a
// form action). OIDC redirect_uris may use native/custom schemes, so for those
// only reject the dangerous executable schemes.
const DANGEROUS_SCHEME = /^\s*(javascript|data|vbscript|file)\s*:/i;

const isHttpUrl = (u) => {
    try {
        const p = new URL(String(u)).protocol;
        return p === "http:" || p === "https:";
    } catch (e) {
        return false;
    }
};

// True if a PEM X.509 cert parses and is currently within its validity window.
// A null/empty cert is "ok" here (means "no cert supplied"); callers decide.
const certCurrentlyValid = (pem) => {
    if (!pem) {
        return true;
    }
    try {
        const x   = new crypto.X509Certificate(pem);
        const now = Date.now();
        const nb  = Date.parse(x.validFrom);
        const na  = Date.parse(x.validTo);
        return Number.isFinite(nb) && Number.isFinite(na) && now >= nb && now <= na;
    } catch (e) {
        return false;
    }
};


// Lightweight per-session rate limit on admin MUTATIONS (defence-in-depth on top
// of the role gate). In-memory sliding window keyed by session id (falls back to
// IP). Generous enough never to trip normal admin use or the gates.
const adminHits = new Map();

const adminRateOk = (req) => {
    const key    = (req.sessionID || (req.session && req.session.id) || (req.connection && req.connection.remoteAddress) || "anon");
    const now    = Date.now();
    const window = constants.ADMIN_RATE_WINDOW_MS;
    const hits   = (adminHits.get(key) || []).filter((t) => now - t < window);
    if (hits.length >= constants.ADMIN_RATE_MAX) {
        adminHits.set(key, hits);
        return false;
    }
    hits.push(now);
    adminHits.set(key, hits);
    return true;
};


const csrfField = (req) => {
    const token = req.csrfToken ? req.csrfToken() : "";
    return `<input type="hidden" name="_csrf" value="${escapeHtml(token)}">`;
};


// Bootstrap nav-pills with the current page marked active. The active link is the
// one whose href is the LONGEST boundary-safe prefix of the request path, so a
// sub-page (e.g. /clients/<id>/secret) still highlights its parent tab.
const navPills = (req, links) => {
    const cur = String((req && (req.originalUrl || req.path)) || "").split("?")[0].replace(/\/+$/, "");
    let activeHref = "";
    for (const [href] of links) {
        const h = href.replace(/\/+$/, "");
        if ((cur === h || cur.startsWith(h + "/")) && h.length > activeHref.length) {
            activeHref = h;
        }
    }
    const items = links.map(([href, label]) => {
        const on = href.replace(/\/+$/, "") === activeHref;
        return `  <li class="nav-item"><a class="nav-link${on ? " active" : ""}"${on ? ' aria-current="page"' : ""} href="${escapeHtml(href)}">${escapeHtml(label)}</a></li>`;
    }).join("\n");
    return `<ul class="nav nav-pills mb-3">\n${items}\n</ul>`;
};


const IDP_NAV = [
    [constants.ADMIN_BASE_PATH, "Dashboard"],
    [constants.ADMIN_BASE_PATH + "/clients", "Clients"],
    [constants.ADMIN_BASE_PATH + "/groups", "Groups"],
    [constants.ADMIN_BASE_PATH + "/saml-sps", "SAML SPs"],
    [constants.ADMIN_BASE_PATH + "/ldap", "LDAP"],
];


// Render an admin page in the ACTIVE Saltcorn theme: breadcrumbs + sub-nav +
// content segments (cards or strings), via res.sendWrap. The one rendering path;
// pages build content with mkTable / renderForm / post_btn (no raw page HTML).
const adminPage = (req, res, title, ...segments) => {
    const above = [
        { type: "breadcrumbs", crumbs: [{ text: "Settings", href: "/settings" }, { text: "saltcorn-idp" }, { text: title }] },
        navPills(req, IDP_NAV),
    ];
    res.sendWrap(`saltcorn-idp ${title}`, { above: above.concat(segments) });
};


const dashboard = async (req, res) => {
    if (!isAdmin(req)) {
        res.status(403).type("text/plain").send("admin only");
        return;
    }
    try {
        // Opportunistically sweep RETIRING keys whose grace window has elapsed to
        // RETIRED (drops them from JWKS) so admins don't need a separate cron.
        await keys.retireExpiredKeys();
        const env    = await getEnv();
        const jwks   = await keys.getJwks();
        const active = await keys.getActiveKeyMeta();
        const issuer = issuerForReq(req);
        const kvRows = [
            { k: "Env ID", v: code(escapeHtml(env ? env.env_id : "?")) },
            { k: "Bootstrapped at", v: escapeHtml(env ? env.bootstrapped_at : "") },
            { k: "Issuer", v: code(escapeHtml(issuer)) },
            { k: "Active signing key (kid)", v: code(escapeHtml(active ? active.kid : "(none)")) },
            { k: "Active key status", v: escapeHtml(active ? constants.KEY_STATUS.ACTIVE : "(none)") },
            { k: "Active key created at", v: escapeHtml(active ? active.created_at : "") },
            { k: "Signing alg", v: escapeHtml(active ? active.alg : "") },
            { k: "Published JWKS keys", v: escapeHtml(jwks.keys.length) },
            { k: "Discovery", v: link(constants.WELL_KNOWN_OPENID, constants.WELL_KNOWN_OPENID) },
            { k: "JWKS", v: link(constants.JWKS_PATH, constants.JWKS_PATH) },
        ];
        const kv = mkTable([{ label: "Setting", key: "k" }, { label: "Value", key: (r) => r.v }], kvRows);
        const rotate = p({ class: "text-muted" }, "Generates a new active signing key (new kid). The previous key keeps verifying issued tokens (stays in JWKS as ", code("retiring"), ") until its grace window elapses, then drops out.") +
            post_btn(constants.ADMIN_BASE_PATH + "/rotate-key", "Rotate signing key", req.csrfToken(), { req, btnClass: "btn-warning", confirm: true });
        adminPage(req, res, "dashboard",
            { type: "card", title: "Identity provider", contents: kv },
            { type: "card", title: "Signing key rotation", contents: rotate }
        );
    } catch (e) {
        // eslint-disable-next-line no-console
        console.error(`[${constants.PLUGIN_NAME}] dashboard failed:`, e);
        res.status(500).type("text/plain").send("dashboard unavailable");
    }
};


const rotateKeyHandler = async (req, res) => {
    if (!requireAdmin(req, res)) {
        return;
    }
    try {
        await keys.rotateActiveKey();
    } catch (e) {
        // eslint-disable-next-line no-console
        console.error(`[${constants.PLUGIN_NAME}] key rotation failed:`, e);
    }
    res.redirect(constants.ADMIN_BASE_PATH);
};


const groupsPage = async (req, res) => {
    if (!isAdmin(req)) {
        res.status(403).type("text/plain").send("admin only");
        return;
    }
    try {
        const all = await groups.listGroups();
        const groupRows = [];
        for (const g of all) {
            const members = await groups.membersOf(g.id);
            const memberList = members.map((member) =>
                span({ class: "d-inline-block me-2 mb-1" },
                    code(escapeHtml(member.user_email)) + " " +
                    post_btn(constants.ADMIN_BASE_PATH + "/groups/removemember", "x", req.csrfToken(), { req, btnClass: "btn-outline-danger", small: true, formClass: "d-inline", body: { group_id: g.id, user_email: member.user_email } }))
            ).join("");
            const addMember = `<form class="d-inline" method="post" action="${escapeHtml(constants.ADMIN_BASE_PATH)}/groups/addmember">${csrfField(req)}<input type="hidden" name="group_id" value="${escapeHtml(g.id)}"><input type="text" class="form-control form-control-sm d-inline-block w-auto me-1" name="email" placeholder="user email"><button class="btn btn-primary btn-sm">add</button></form>`;
            groupRows.push({
                name: code(escapeHtml(g.name)),
                members: (memberList || span({ class: "text-muted" }, "(none)")) + "<br>" + addMember,
                actions: post_btn(constants.ADMIN_BASE_PATH + "/groups/delete", "delete", req.csrfToken(), { req, btnClass: "btn-danger", small: true, body: { id: g.id }, confirm: true }),
            });
        }
        const groupsTable = groupRows.length === 0
            ? p({ class: "text-muted" }, "no groups yet")
            : mkTable([{ label: "Group", key: (r) => r.name }, { label: "Members", key: (r) => r.members }, { label: "", key: (r) => r.actions }], groupRows);
        const createForm = new Form({ action: constants.ADMIN_BASE_PATH + "/groups/create", submitLabel: "Create", fields: [{ name: "name", label: "Group name", type: "String", required: true }] });
        adminPage(req, res, "groups",
            { type: "card", title: "Groups", contents:
                p({ class: "text-muted" }, "The OIDC ", code("groups"), " claim = each user's Saltcorn role (as ", code("role:&lt;name&gt;"), ") plus these custom groups (as ", code("group:&lt;name&gt;"), ").") + groupsTable },
            { type: "card", title: "Create group", contents: renderForm(createForm, req.csrfToken()) }
        );
    } catch (e) {
        // eslint-disable-next-line no-console
        console.error(`[${constants.PLUGIN_NAME}] groups page failed:`, e);
        res.status(500).type("text/plain").send("groups unavailable");
    }
};


const requireAdmin = (req, res) => {
    if (!isAdmin(req)) {
        res.status(403).type("text/plain").send("admin only");
        return false;
    }
    // requireAdmin gates the mutating handlers; throttle POSTs per session.
    if (req.method === "POST" && !adminRateOk(req)) {
        res.status(429).type("text/plain").send("too many requests");
        return false;
    }
    return true;
};


const createGroupHandler = async (req, res) => {
    if (!requireAdmin(req, res)) {
        return;
    }
    const name = String((req.body && req.body.name) || "").trim();
    if (name) {
        try {
            await groups.createGroup(name);
        } catch (e) {
            // unique-name violation or similar; ignore and re-render
        }
    }
    res.redirect(constants.ADMIN_BASE_PATH + "/groups");
};


const deleteGroupHandler = async (req, res) => {
    if (!requireAdmin(req, res)) {
        return;
    }
    const id = parseInt(req.body && req.body.id, 10);
    if (Number.isFinite(id)) {
        await groups.deleteGroup(id);
    }
    res.redirect(constants.ADMIN_BASE_PATH + "/groups");
};


const addMemberHandler = async (req, res) => {
    if (!requireAdmin(req, res)) {
        return;
    }
    const groupId = parseInt(req.body && req.body.group_id, 10);
    const email   = String((req.body && req.body.email) || "").trim();
    if (Number.isFinite(groupId) && email) {
        // Validate the user exists and store its CANONICAL email (matches how
        // users.email is stored), so the membership key stays consistent.
        const u = await User.findOne({ email: email });
        if (u) {
            await groups.addMember(groupId, u.email);
        }
    }
    res.redirect(constants.ADMIN_BASE_PATH + "/groups");
};


const removeMemberHandler = async (req, res) => {
    if (!requireAdmin(req, res)) {
        return;
    }
    const groupId = parseInt(req.body && req.body.group_id, 10);
    const email   = String((req.body && req.body.user_email) || "").trim();
    if (Number.isFinite(groupId) && email) {
        await groups.removeMember(groupId, email);
    }
    res.redirect(constants.ADMIN_BASE_PATH + "/groups");
};


const clientsPage = async (req, res) => {
    if (!isAdmin(req)) {
        res.status(403).type("text/plain").send("admin only");
        return;
    }
    try {
        const all = await clients.listClients();
        const clientsTable = all.length === 0
            ? p({ class: "text-muted" }, "no clients yet")
            : mkTable([
                { label: "client_id", key: (c) => code(escapeHtml(c.client_id)) },
                { label: "label", key: (c) => escapeHtml(c.label || "") },
                { label: "auth", key: (c) => escapeHtml(c.token_auth_method) },
                { label: "redirect URIs", key: (c) => JSON.parse(c.redirect_uris).map((u) => code(escapeHtml(u))).join("<br>") },
                { label: "scope", key: (c) => escapeHtml(c.scope || "") },
                { label: "", key: (c) => post_btn(constants.ADMIN_BASE_PATH + "/clients/delete", "delete", req.csrfToken(), { req, btnClass: "btn-danger", small: true, body: { client_id: c.client_id }, confirm: true }) },
            ], all);
        const regForm = new Form({
            action: constants.ADMIN_BASE_PATH + "/clients/create",
            submitLabel: "Register",
            values: { auth_method: "none", scope: "openid email profile groups" },
            fields: [
                { name: "client_id", label: "client_id", type: "String", required: true },
                { name: "label", label: "label", type: "String" },
                { name: "redirect_uris", label: "redirect URIs (one per line)", type: "String", fieldview: "textarea" },
                { name: "auth_method", label: "auth method", input_type: "select", options: [
                    { label: "none (public + PKCE)", value: "none" },
                    { label: "client_secret_basic (confidential)", value: "client_secret_basic" },
                    { label: "client_secret_post (confidential)", value: "client_secret_post" },
                ] },
                { name: "scope", label: "scope", type: "String" },
            ],
        });
        adminPage(req, res, "clients",
            { type: "card", title: "Clients (relying parties)", contents: clientsTable },
            { type: "card", title: "Register client", contents: renderForm(regForm, req.csrfToken()) }
        );
    } catch (e) {
        // eslint-disable-next-line no-console
        console.error(`[${constants.PLUGIN_NAME}] clients page failed:`, e);
        res.status(500).type("text/plain").send("clients unavailable");
    }
};


const parseUris = (text) => {
    return String(text || "").split(/[\r\n]+/).map((s) => s.trim()).filter(Boolean);
};


const createClientHandler = async (req, res) => {
    if (!requireAdmin(req, res)) {
        return;
    }
    const clientId     = String((req.body && req.body.client_id) || "").trim();
    const redirectUris = parseUris(req.body && req.body.redirect_uris);
    // Reject executable-scheme redirect URIs (javascript:/data:/...). Custom
    // native-app schemes + loopback are allowed (oidc-provider validates the rest).
    if (!clientId || redirectUris.some((u) => DANGEROUS_SCHEME.test(u))) {
        res.redirect(constants.ADMIN_BASE_PATH + "/clients");
        return;
    }
    let created = null;
    try {
        created = await clients.createClient({
            clientId:     clientId,
            label:        String((req.body && req.body.label) || "").trim(),
            redirectUris: redirectUris,
            authMethod:   String((req.body && req.body.auth_method) || "none"),
            scope:        String((req.body && req.body.scope) || "").trim()
        });
    } catch (e) {
        res.redirect(constants.ADMIN_BASE_PATH + "/clients");
        return;
    }
    if (created && created.secret) {
        adminPage(req, res, "client secret",
            { type: "card", title: "Client registered", contents:
                p("client_id: ", code(escapeHtml(created.client_id))) +
                p("Client secret (shown once - copy it now):") +
                pre({ class: "user-select-all p-2 bg-light text-dark border rounded", style: "white-space:pre-wrap;word-break:break-all" }, escapeHtml(created.secret)) +
                p(link(constants.ADMIN_BASE_PATH + "/clients", "Back to clients")) }
        );
    } else {
        res.redirect(constants.ADMIN_BASE_PATH + "/clients");
    }
};


const deleteClientHandler = async (req, res) => {
    if (!requireAdmin(req, res)) {
        return;
    }
    const clientId = String((req.body && req.body.client_id) || "").trim();
    if (clientId) {
        await clients.deleteClient(clientId);
    }
    res.redirect(constants.ADMIN_BASE_PATH + "/clients");
};


const samlSpsPage = async (req, res) => {
    if (!isAdmin(req)) {
        res.status(403).type("text/plain").send("admin only");
        return;
    }
    try {
        const all = await samlSps.listSps();
        const spsTable = all.length === 0
            ? p({ class: "text-muted" }, "no SPs yet")
            : mkTable([
                { label: "entityID", key: (s) => code(escapeHtml(s.entity_id)) },
                { label: "label", key: (s) => escapeHtml(s.label || "") },
                { label: "ACS URLs", key: (s) => samlSps.acsUrls(s).map((u) => code(escapeHtml(u))).join("<br>") },
                { label: "req signed", key: (s) => s.want_authn_requests_signed ? "yes" : "no" },
                { label: "cert", key: (s) => s.signing_cert ? "yes" : "no" },
                { label: "", key: (s) => post_btn(constants.ADMIN_BASE_PATH + "/saml-sps/delete", "delete", req.csrfToken(), { req, btnClass: "btn-danger", small: true, body: { entity_id: s.entity_id }, confirm: true }) },
            ], all);
        const regForm = new Form({
            action: constants.ADMIN_BASE_PATH + "/saml-sps/create",
            submitLabel: "Register",
            fields: [
                { name: "entity_id", label: "entityID", type: "String", required: true },
                { name: "label", label: "label", type: "String" },
                { name: "acs_urls", label: "ACS URLs (one per line)", type: "String", fieldview: "textarea" },
                { name: "signing_cert", label: "signing cert (PEM, optional)", type: "String", fieldview: "textarea" },
                { name: "want_signed", label: "require signed AuthnRequests", type: "Bool" },
            ],
        });
        adminPage(req, res, "saml sps",
            { type: "card", title: "SAML service providers", contents:
                p({ class: "text-muted" }, "Only registered SPs receive assertions, and only at an allow-listed ACS URL. A signing cert enables (and \"require signed\" enforces) AuthnRequest signature verification.") + spsTable },
            { type: "card", title: "Register SP", contents: renderForm(regForm, req.csrfToken()) }
        );
    } catch (e) {
        // eslint-disable-next-line no-console
        console.error(`[${constants.PLUGIN_NAME}] saml sps page failed:`, e);
        res.status(500).type("text/plain").send("saml sps unavailable");
    }
};


const createSamlSpHandler = async (req, res) => {
    if (!requireAdmin(req, res)) {
        return;
    }
    const entityId = String((req.body && req.body.entity_id) || "").trim();
    const acsUrls  = parseUris(req.body && req.body.acs_urls);
    // An SP with no ACS URL is unusable and a hazard: the SSO/SLO handlers would
    // have nothing to validate a request-supplied ACS against. Reject it here so
    // a no-ACS SP never reaches the registry (defence-in-depth over the request
    // handlers, which also reject an empty allow-list).
    const signingCert = String((req.body && req.body.signing_cert) || "").trim() || null;
    // Reject: no entityId, no/empty ACS list, any ACS that is not an http(s) URL
    // (a SAML ACS is always a web endpoint; this blocks a "javascript:" ACS from
    // becoming the auto-POST form action), or an expired/unparseable signing cert.
    if (!entityId || acsUrls.length === 0 || !acsUrls.every(isHttpUrl) || !certCurrentlyValid(signingCert)) {
        res.redirect(constants.ADMIN_BASE_PATH + "/saml-sps");
        return;
    }
    try {
        await samlSps.createSp({
            entityId:    entityId,
            label:       String((req.body && req.body.label) || "").trim(),
            acsUrls:     acsUrls,
            signingCert: signingCert,
            wantSigned:  !!(req.body && req.body.want_signed)
        });
    } catch (e) {
        // duplicate entity_id or similar; fall through to re-render
    }
    res.redirect(constants.ADMIN_BASE_PATH + "/saml-sps");
};


const deleteSamlSpHandler = async (req, res) => {
    if (!requireAdmin(req, res)) {
        return;
    }
    const entityId = String((req.body && req.body.entity_id) || "").trim();
    if (entityId) {
        await samlSps.deleteSp(entityId);
    }
    res.redirect(constants.ADMIN_BASE_PATH + "/saml-sps");
};


// The LDAP listener is process-global (one per instance), so its host/port/enable
// settings are editable only on the root/public site; tenant admins see them
// read-only. isRootTenant() is true on a single-tenant (SQLite) deployment.
const isRootTenant = () => {
    if (!db.is_it_multi_tenant || !db.is_it_multi_tenant()) {
        return true;
    }
    const def = String((db.connectObj && db.connectObj.default_schema) || "public").toLowerCase();
    const cur = String((db.getTenantSchema && db.getTenantSchema()) || "").toLowerCase();
    return cur === def;
};


// Whether the running listener (applied) differs from the resolved desired
// settings (runtime) -- i.e. a restart is needed for an edit to take effect.
const ldapAppliedDiffers = (applied, runtime) => {
    const a = applied || { enabled: false };
    if (!a.enabled && !runtime.enabled) {
        return false;
    }
    if (!!a.enabled !== !!runtime.enabled) {
        return true;
    }
    return a.host !== runtime.host || a.port !== runtime.port;
};


const LDAP_SETTINGS_ERRORS = {
    port:   "Port must be an integer between 1 and 65535.",
    host:   "Bind host contains invalid characters.",
    noport: "Enabling the LDAP listener requires a valid port."
};


const ldapListenerSection = async (req) => {
    const runtime   = await ldapSettings.resolveRuntime();
    const applied   = await ldapSettings.getApplied();
    const effective = runtime.enabled ? `${escapeHtml(runtime.host)}:${escapeHtml(String(runtime.port))}` : "disabled";
    const running   = (applied && applied.enabled) ? `${escapeHtml(applied.host)}:${escapeHtml(String(applied.port))}` : "disabled";
    const statusTable = `<table class="table table-sm table-bordered">
            <tr><th>Currently running</th><td>${running}</td></tr>
            <tr><th>Effective after restart</th><td>${effective}</td></tr>
        </table>`;
    if (!isRootTenant()) {
        return `<h2>LDAP listener</h2>
        <p class="text-muted">One LDAPS listener serves all tenants on this Saltcorn instance; it is configured on the <strong>public site</strong> (read-only here).</p>
        ${statusTable}`;
    }
    const stored    = await ldapSettings.getStoredConfig();
    const errCode   = String((req.query && req.query.err) || "");
    const errBanner = (errCode && LDAP_SETTINGS_ERRORS[errCode])
        ? `<p style="color:#b00"><strong>${escapeHtml(LDAP_SETTINGS_ERRORS[errCode])}</strong></p>` : "";
    const restartBanner = ldapAppliedDiffers(applied, runtime)
        ? `<p style="color:#b00"><strong>&#9888; LDAP settings changed &mdash; restart Saltcorn for them to take effect.</strong></p>` : "";
    const envNote = (runtime.portFromEnv || runtime.hostFromEnv)
        ? `<p class="text-muted">An LDAP environment variable (${escapeHtml(constants.LDAP_PORT_ENV)} / ${escapeHtml(constants.LDAP_HOST_ENV)}) is set and currently OVERRIDES the values below until it is removed.</p>` : "";
    const exposureWarn = (stored.host && !ldapSettings.isLoopbackHost(stored.host))
        ? `<p style="color:#b00">Warning: bind host <code>${escapeHtml(stored.host)}</code> is beyond loopback &mdash; the listener will be reachable from the network. Ensure this is intended and firewalled.</p>` : "";
    return `<h2>LDAP listener (this server)</h2>
        <p class="text-muted">One LDAPS listener serves all tenants on this Saltcorn instance. Changes apply on the next Saltcorn restart.</p>
        ${errBanner}${restartBanner}${envNote}
        ${statusTable}
        <form method="post" action="${escapeHtml(constants.ADMIN_BASE_PATH)}/ldap/settings">${csrfField(req)}
            <p><label><input type="checkbox" class="form-check-input me-1" name="enabled" value="on" ${stored.enabled ? "checked" : ""}> Enable LDAP listener</label></p>
            <p>Bind host <input type="text" class="form-control form-control-sm d-inline-block w-auto" name="host" value="${escapeHtml(stored.host || "")}" placeholder="${escapeHtml(constants.LDAP_DEFAULT_HOST)}" size="22"></p>
            <p>Port <input type="number" class="form-control form-control-sm d-inline-block w-auto" name="port" value="${stored.port !== null ? escapeHtml(String(stored.port)) : ""}" min="${escapeHtml(String(constants.LDAP_PORT_MIN))}" max="${escapeHtml(String(constants.LDAP_PORT_MAX))}"></p>
            ${exposureWarn}
            <button class="btn btn-primary btn-sm">save listener settings</button>
        </form>`;
};


const ldapServicePage = async (req, res) => {
    if (!isAdmin(req)) {
        res.status(403).type("text/plain").send("admin only");
        return;
    }
    try {
        const dn = await serviceAccount.getServiceDn();
        const listener = await ldapListenerSection(req);
        const setForm = new Form({
            action: constants.ADMIN_BASE_PATH + "/ldap/service",
            submitLabel: "Save",
            fields: [
                { name: "dn", label: "service DN", type: "String", attributes: { placeholder: "cn=svc,ou=people,dc=saltcorn,dc=local" } },
                { name: "password", label: "password", type: "String", input_type: "password" },
            ],
        });
        adminPage(req, res, "ldap",
            { type: "card", title: "LDAP listener", contents: listener },
            { type: "card", title: "LDAP service account", contents:
                p({ class: "text-muted" }, "A service DN + password for the search-then-bind flow (an application binds as this DN, searches for a user, then re-binds as that user to validate the password). The password is sealed at rest and never displayed.") +
                p("Configured service DN: ", dn ? code(escapeHtml(dn)) : span({ class: "text-muted" }, "(none)")) +
                renderForm(setForm, req.csrfToken()) },
            { type: "card", title: "Clear", contents:
                post_btn(constants.ADMIN_BASE_PATH + "/ldap/service/clear", "Clear service account", req.csrfToken(), { req, btnClass: "btn-outline-danger", confirm: true }) }
        );
    } catch (e) {
        // eslint-disable-next-line no-console
        console.error(`[${constants.PLUGIN_NAME}] ldap service page failed:`, e);
        res.status(500).type("text/plain").send("ldap admin unavailable");
    }
};


const setLdapServiceHandler = async (req, res) => {
    if (!requireAdmin(req, res)) {
        return;
    }
    const dn       = String((req.body && req.body.dn) || "").trim();
    const password = String((req.body && req.body.password) || "");
    if (dn && password) {
        await serviceAccount.setServiceAccount(dn, password);
    }
    res.redirect(constants.ADMIN_BASE_PATH + "/ldap");
};


const clearLdapServiceHandler = async (req, res) => {
    if (!requireAdmin(req, res)) {
        return;
    }
    await serviceAccount.setServiceAccount(null, null);
    res.redirect(constants.ADMIN_BASE_PATH + "/ldap");
};


const setLdapSettingsHandler = async (req, res) => {
    if (!requireAdmin(req, res)) {
        return;
    }
    // The listener is process-global; only the public/root site may change it.
    if (!isRootTenant()) {
        res.status(403).type("text/plain").send("LDAP listener settings are managed on the public site");
        return;
    }
    const enabled = !!(req.body && (req.body.enabled === "on" || req.body.enabled === "true" || req.body.enabled === true));
    const host    = String((req.body && req.body.host) || "").trim();
    const portRaw = String((req.body && req.body.port) || "").trim();
    if (host && !/^[A-Za-z0-9_.:-]+$/.test(host)) {
        res.redirect(constants.ADMIN_BASE_PATH + "/ldap?err=host");
        return;
    }
    let port = null;
    if (portRaw !== "") {
        const n = parseInt(portRaw, 10);
        if (!ldapSettings.validatePort(n)) {
            res.redirect(constants.ADMIN_BASE_PATH + "/ldap?err=port");
            return;
        }
        port = n;
    }
    if (enabled && port === null) {
        res.redirect(constants.ADMIN_BASE_PATH + "/ldap?err=noport");
        return;
    }
    await ldapSettings.setStoredConfig({ enabled: enabled, host: host, port: port });
    res.redirect(constants.ADMIN_BASE_PATH + "/ldap");
};


const adminRoutes = [
    { url: constants.ADMIN_BASE_PATH,                          method: "get",  callback: dashboard },
    { url: constants.ADMIN_BASE_PATH + "/",                    method: "get",  callback: dashboard },
    { url: constants.ADMIN_BASE_PATH + "/rotate-key",         method: "post", callback: rotateKeyHandler },
    { url: constants.ADMIN_BASE_PATH + "/clients",            method: "get",  callback: clientsPage },
    { url: constants.ADMIN_BASE_PATH + "/clients/create",     method: "post", callback: createClientHandler },
    { url: constants.ADMIN_BASE_PATH + "/clients/delete",     method: "post", callback: deleteClientHandler },
    { url: constants.ADMIN_BASE_PATH + "/groups",             method: "get",  callback: groupsPage },
    { url: constants.ADMIN_BASE_PATH + "/groups/create",      method: "post", callback: createGroupHandler },
    { url: constants.ADMIN_BASE_PATH + "/groups/delete",      method: "post", callback: deleteGroupHandler },
    { url: constants.ADMIN_BASE_PATH + "/groups/addmember",   method: "post", callback: addMemberHandler },
    { url: constants.ADMIN_BASE_PATH + "/groups/removemember", method: "post", callback: removeMemberHandler },
    { url: constants.ADMIN_BASE_PATH + "/saml-sps",           method: "get",  callback: samlSpsPage },
    { url: constants.ADMIN_BASE_PATH + "/saml-sps/create",    method: "post", callback: createSamlSpHandler },
    { url: constants.ADMIN_BASE_PATH + "/saml-sps/delete",    method: "post", callback: deleteSamlSpHandler },
    { url: constants.ADMIN_BASE_PATH + "/ldap",               method: "get",  callback: ldapServicePage },
    { url: constants.ADMIN_BASE_PATH + "/ldap/service",       method: "post", callback: setLdapServiceHandler },
    { url: constants.ADMIN_BASE_PATH + "/ldap/service/clear", method: "post", callback: clearLdapServiceHandler },
    { url: constants.ADMIN_BASE_PATH + "/ldap/settings",      method: "post", callback: setLdapSettingsHandler }
];


module.exports = {
    adminRoutes,
    isAdmin,
    escapeHtml
};