const express = require('express');
const cors = require('cors');
const cookieParser = require('cookie-parser');
const fs = require('fs');
const os = require('os');
const path = require('path');
const yaml = require('js-yaml');
const YAML = require('yaml'); 
const db = require('../Structures/Database.js');
const configStore = require('../Structures/ConfigStore.js');
const { reloadBot, restartDiscordBot } = require('../Structures/BotReload.js');
const { LOG_TYPES, fetchLogs, getLogMeta } = require('../Structures/LogReader.js');
const { evaluateAllModules } = require('../Structures/ModuleStatus.js');
const { getBotInviteUrl } = require('../Structures/BotInvite.js');
const notificationStore = require('../Structures/NotificationStore.js');
const {
    notifyBotRestart,
    notifyUpdateInstalled,
    runUpdateCheck,
} = require('../Structures/NotificationService.js');
const {
    SESSION_COOKIE,
    signSession,
    verifySession,
    createSessionPayload,
    sessionCookieOptions,
} = require('../Structures/DashboardSession.js');
const {
    OAUTH_STATE_COOKIE,
    buildAuthorizeUrl,
    exchangeCode,
    fetchDiscordUser,
    createOAuthState,
    oauthStateCookieOptions,
    isOAuthConfigured,
    discordAvatarUrl,
} = require('../Structures/DiscordOAuth.js');
const {
    bootstrapFromOAuth,
    getAccess,
    canLogin,
    formatPublicUser,
    syncDiscordProfile,
    listUsers,
    addUser,
    updateUser,
    removeUser,
    hasPermission,
    canAccessConfig,
    ROLES,
    CONFIG_FILES,
} = require('../Structures/DashboardUserStore.js');
const {
    grantServiceAccess,
    forbid,
    assertConfigFilesEditable,
    fullPermissions,
} = require('../Structures/DashboardAuth.js');
const {
    syncGuildHealth,
    leaveGuild,
    fetchGuildResources,
    clearGuildResourcesCache,
} = require('../Structures/GuildManager.js');
const { withTimeout } = require('../Structures/asyncTimeout.js');
const {
    listCatalogAddons,
    listInstalledAddons,
    installAddonFromCatalog,
    listLocalAddonConfigs,
    readAddonConfig,
    writeAddonConfig,
} = require('../Structures/AddonCatalog.js');

const DASHBOARD_DIR = path.join(__dirname, '../public/dashboard');
const UPDATE_REPO = 'C-h-a-r/SupportBot-Dashboard';
const UPDATE_BRANCH = 'release';
const UPDATE_ZIP_URL = `https://github.com/${UPDATE_REPO}/archive/refs/heads/${UPDATE_BRANCH}.zip`;

class APIServer {
    constructor(client) {
        this.client = client;
        this.app = express();

        try {
            const apiCfg = yaml.load(fs.readFileSync('./Configs/api.yml', 'utf8')).API;
            this.config = apiCfg;
        } catch (e) {
            console.error('[API] Failed to load api.yml, defaulting to disabled.');
            this.config = { Enabled: false };
        }

        if (!this.config.Enabled) return;

        this.oauth = this.config.OAuth || {};
        bootstrapFromOAuth(this.oauth);

        this.app.use(cors({ origin: true, credentials: true }));
        this.app.use(cookieParser());
        this.app.use(express.json());

        this.app.get('/api/health', (req, res) => {
            const guild =
                this.client?.user ? syncGuildHealth(this.client) : null;
            res.json({
                success: true,
                dashboard: fs.existsSync(DASHBOARD_DIR),
                botReady: Boolean(this.client?.user) && !this.client?.__restarting,
                botRestarting: Boolean(this.client?.__restarting),
                oauthEnabled: isOAuthConfigured(this.oauth),
                guild,
            });
        });

        this.setupAuthRoutes();

        const api = express.Router();
        api.use((req, res, next) => this.authenticate(req, res, next));
        this.apiRouter = api;
        this.setupRoutes();
        this.app.use('/api', api);

        this.setupDashboard();

        this.app.use((err, req, res, next) => {
            if (res.headersSent) return next(err);
            console.error('[API] Unhandled error:', err);
            res.status(500).json({
                success: false,
                error: err.message || 'Internal server error',
            });
        });
    }

    authenticate(req, res, next) {
        const secret = this.config.SecretKey;
        const session = verifySession(req.cookies?.[SESSION_COOKIE], secret);

        if (session?.userId) {
            const access = getAccess(session.userId, this.oauth);
            if (access) {
                req.dashboardUser = session;
                req.dashboardPermissions = access.permissions;
                req.dashboardRole = access.role;
                req.dashboardIsOwner = access.isOwner;
                return next();
            }
        }

        const authHeader = req.headers.authorization;
        if (authHeader === `Bearer ${secret}`) {
            grantServiceAccess(req);
            return next();
        }

        return res.status(401).json({
            error: 'Unauthorized. Sign in with Discord.',
        });
    }

    requirePermission(permission) {
        return (req, res, next) => {
            if (req.dashboardService) return next();
            if (hasPermission(req.dashboardPermissions, permission)) return next();
            return forbid(res);
        };
    }

    requireConfigAccess(mode = 'view') {
        return (req, res, next) => {
            if (req.dashboardService) return next();
            const file = req.params?.file || req.body?.filename;
            if (!file) return next();
            if (!canAccessConfig(req.dashboardPermissions, file, mode)) {
                return forbid(res);
            }
            return next();
        };
    }

    respondAuthUser(req, res, session) {
        const access = getAccess(session.userId, this.oauth);
        if (!access) {
            return res.status(401).json({ success: false, error: 'Not signed in' });
        }

        return res.json({
            success: true,
            data: formatPublicUser(
                access.entry,
                access,
                {
                    id: session.userId,
                    username: session.username,
                    global_name: session.globalName,
                    avatar: session.avatar,
                },
            ),
        });
    }

    setupAuthRoutes() {
        const secret = this.config.SecretKey;
        const oauth = this.oauth;

        this.app.get('/api/auth/discord', (req, res) => {
            if (!isOAuthConfigured(oauth)) {
                return res.redirect('/login?error=oauth_not_configured');
            }

            const state = createOAuthState();
            res.cookie(OAUTH_STATE_COOKIE, state, oauthStateCookieOptions());
            res.redirect(buildAuthorizeUrl(oauth, state));
        });

        this.app.get('/api/auth/discord/callback', async (req, res) => {
            if (!isOAuthConfigured(oauth)) {
                return res.redirect('/login?error=oauth_not_configured');
            }

            const { code, state, error } = req.query;
            if (error) {
                return res.redirect(`/login?error=${encodeURIComponent(String(error))}`);
            }
            if (!code || !state) {
                return res.redirect('/login?error=missing_code');
            }

            const savedState = req.cookies?.[OAUTH_STATE_COOKIE];
            res.clearCookie(OAUTH_STATE_COOKIE, { path: '/' });

            if (!savedState || savedState !== state) {
                return res.redirect('/login?error=invalid_state');
            }

            try {
                const accessToken = await exchangeCode(oauth, String(code));
                const user = await fetchDiscordUser(accessToken);

                if (!canLogin(user.id, oauth)) {
                    return res.redirect('/login?error=not_allowed');
                }

                syncDiscordProfile(user.id, {
                    username: user.username,
                    globalName: user.global_name || null,
                    avatar: user.avatar || null,
                });

                const payload = createSessionPayload(user);
                const token = signSession(payload, secret);
                res.cookie(SESSION_COOKIE, token, sessionCookieOptions());
                res.redirect('/');
            } catch (err) {
                console.error('[API] Discord OAuth callback failed:', err.message);
                res.redirect('/login?error=oauth_failed');
            }
        });

        this.app.get('/api/auth/me', (req, res) => {
            const session = verifySession(req.cookies?.[SESSION_COOKIE], secret);
            if (!session?.userId) {
                return res.status(401).json({ success: false, error: 'Not signed in' });
            }
            return this.respondAuthUser(req, res, session);
        });

        this.app.post('/api/auth/logout', (req, res) => {
            res.clearCookie(SESSION_COOKIE, { path: '/' });
            res.json({ success: true });
        });
    }

    resolveDashboardDir() {
        const candidates = [
            DASHBOARD_DIR,
            path.join(process.cwd(), 'public', 'dashboard'),
        ];
        for (const dir of candidates) {
            if (fs.existsSync(path.join(dir, 'index.html'))) {
                return dir;
            }
        }
        return null;
    }

    setupDashboard() {
        const dashboardDir = this.resolveDashboardDir();
        const port = this.config.Port || 3000;

        if (!dashboardDir) {
            console.warn(
                '[API] Dashboard UI missing — add the public/dashboard/ folder from the repository (index.html + assets/).',
            );
            this.app.get('/', (req, res) => {
                res.status(503).type('html').send(`<!DOCTYPE html>
<html lang="en"><head><meta charset="utf-8"><title>SupportBot Dashboard</title>
<style>body{font-family:system-ui,sans-serif;max-width:36rem;margin:3rem auto;padding:0 1rem;color:#e8e8f0;background:#0c0c10}
h1{font-size:1.25rem}a{color:#a78bfa}</style></head><body>
<h1>Dashboard files not found</h1>
<p>The API is running, but <code>public/dashboard/</code> is missing from this install (no <code>index.html</code>).</p>
<p>Clone or download the repo including <strong>public/dashboard/</strong>, then restart the bot.</p>
<p><a href="/api/health">Check API health</a></p>
</body></html>`);
            });
            return;
        }

        console.log(`[API] Serving dashboard from ${dashboardDir}`);

        this.app.use(
            express.static(dashboardDir, {
                index: 'index.html',
                fallthrough: true,
            }),
        );

        this.app.use((req, res, next) => {
            if (req.method !== 'GET' && req.method !== 'HEAD') return next();
            if (req.path.startsWith('/api')) return next();
            res.sendFile(path.join(dashboardDir, 'index.html'), (err) => {
                if (err) next(err);
            });
        });

        console.log('[API] Dashboard available at http://localhost:' + port);
    }

    start(port) {
        if (this._httpServer) {
            return this._httpServer;
        }

        const listenPort = port || this.config.Port || 3000;
        this._httpServer = this.app.listen(listenPort, () => {
            console.log(`[API] Server running on port ${listenPort}`);
            this.startNotificationJobs();
        });

        this._httpServer.on('error', (err) => {
            if (err.code === 'EADDRINUSE') {
                console.error(
                    `[API] Port ${listenPort} is already in use. Change Port in Configs/api.yml.`,
                );
            } else {
                console.error('[API] Server error:', err);
            }
        });

        return this._httpServer;
    }

    async restartBotAfterConfigSave() {
        if (!this.client) {
            return { success: false, error: 'Bot client not available' };
        }
        if (this.client.__restarting) {
            return {
                success: false,
                error: 'Bot restart already in progress. Try again in a moment.',
            };
        }

        try {
            const result = await withTimeout(
                restartDiscordBot(this.client),
                90_000,
                'Bot restart timed out after 90 seconds',
            );
            clearGuildResourcesCache();
            return {
                success: true,
                commands: result.commands?.count ?? 0,
            };
        } catch (err) {
            console.error('[API] Bot restart failed:', err);
            return { success: false, error: err.message };
        }
    }

    startNotificationJobs() {
        const FIRST_MS = 60 * 1000;
        const INTERVAL_MS = 6 * 60 * 60 * 1000;

        const run = async () => {
            try {
                await runUpdateCheck();
            } catch (err) {
                console.warn('[Notifications] Update check failed:', err.message);
            }
        };

        this._notificationTimers = [
            setTimeout(run, FIRST_MS),
            setInterval(run, INTERVAL_MS),
        ];
    }

    setupRoutes() {
        const app = this.apiRouter;
        const oauth = this.oauth;
        const p = (permission) => this.requirePermission(permission);
        const cv = (mode) => this.requireConfigAccess(mode);

        app.get('/dashboard-users', p('users.view'), (req, res) => {
            try {
                res.json({
                    success: true,
                    data: {
                        users: listUsers(oauth),
                        roles: ROLES,
                        configFiles: CONFIG_FILES,
                    },
                });
            } catch (err) {
                res.status(500).json({ success: false, error: err.message });
            }
        });

        app.post('/dashboard-users', p('users.manage'), (req, res) => {
            try {
                const actorId = req.dashboardUser?.userId || 'service';
                const user = addUser(req.body, actorId, oauth);
                res.json({ success: true, data: user });
            } catch (err) {
                res.status(400).json({ success: false, error: err.message });
            }
        });

        app.patch('/dashboard-users/:id', p('users.manage'), (req, res) => {
            try {
                const actorId = req.dashboardUser?.userId || 'service';
                const user = updateUser(req.params.id, req.body, actorId, oauth);
                res.json({ success: true, data: user });
            } catch (err) {
                res.status(400).json({ success: false, error: err.message });
            }
        });

        app.delete('/dashboard-users/:id', p('users.manage'), (req, res) => {
            try {
                removeUser(req.params.id, oauth);
                res.json({ success: true });
            } catch (err) {
                res.status(400).json({ success: false, error: err.message });
            }
        });

        app.get('/guild/status', p('overview'), (req, res) => {
            try {
                if (!this.client?.user) {
                    return res.json({
                        success: true,
                        data: {
                            status: 'offline',
                            configuredGuildId: null,
                            message: 'Bot is not connected to Discord.',
                            configuredGuild: null,
                            extraGuilds: [],
                        },
                    });
                }
                res.json({
                    success: true,
                    data: syncGuildHealth(this.client),
                });
            } catch (err) {
                res.status(500).json({ success: false, error: err.message });
            }
        });

        app.get('/guild/resources', (req, res, next) => {
            if (req.dashboardService) return next();
            const canAny = CONFIG_FILES.some((f) =>
                canAccessConfig(req.dashboardPermissions, f, 'view'),
            );
            if (!canAny && !hasPermission(req.dashboardPermissions, 'overview')) {
                return forbid(res);
            }
            return next();
        }, async (req, res) => {
            try {
                if (this.client?.__restarting) {
                    return res.status(503).json({
                        success: false,
                        error: 'Bot is restarting. Channel and role lists will be back shortly.',
                    });
                }
                if (!this.client?.user) {
                    return res.status(503).json({
                        success: false,
                        error: 'Bot is not connected.',
                    });
                }
                const data = await fetchGuildResources(this.client);
                if (!data) {
                    return res.status(400).json({
                        success: false,
                        error: 'Bot is not in the configured server. Set General.GuildId and invite the bot.',
                    });
                }
                res.json({ success: true, data });
            } catch (err) {
                res.status(500).json({ success: false, error: err.message });
            }
        });

        app.post('/guild/:guildId/leave', p('settings.update'), async (req, res) => {
            try {
                if (!this.client?.user) {
                    return res.status(503).json({
                        success: false,
                        error: 'Bot is not connected.',
                    });
                }
                const health = await leaveGuild(this.client, req.params.guildId);
                res.json({ success: true, data: health });
            } catch (err) {
                res.status(400).json({ success: false, error: err.message });
            }
        });

        app.get('/stats', p('overview'), async (req, res) => {
            try {
                if (this.client.__restarting) {
                    return res.json({
                        success: false,
                        error: 'Bot is restarting after a config change. Try again shortly.',
                    });
                }
                if (!this.client.user) {
                    return res.json({ success: false, error: 'Bot is still starting up.' });
                }

                let userCount = 0;
                this.client.guilds.cache.forEach(guild => {
                    userCount += guild.memberCount;
                });

                const allTickets = db.getAllTickets() || [];
                const openTickets = allTickets.filter(t => t.status === 'open').length;
                const closedTickets = allTickets.filter(t => t.status !== 'open').length;

                const transcriptDir = path.join(__dirname, '../Data/Transcripts');
                let transcriptCount = 0;
                if (fs.existsSync(transcriptDir)) {
                    transcriptCount = fs
                        .readdirSync(transcriptDir)
                        .filter((f) => f.endsWith('-transcript.html')).length;
                }

                const modules = evaluateAllModules(configStore, {
                    transcriptCount,
                });

                const totalMem = os.totalmem();
                const freeMem = os.freemem();
                const usedMem = totalMem - freeMem;
                const ramPercent = Math.round((usedMem / totalMem) * 100);
                const cpuLoad = os.loadavg()[0].toFixed(2);

                res.json({
                    success: true,
                    data: {
                        bot: {
                            username: this.client.user.username,
                            id: this.client.user.id,
                            avatar: this.client.user.displayAvatarURL(),
                            inviteUrl: getBotInviteUrl(this.client.user.id),
                            version: require('../package.json').version,
                            ping: this.client.ws.ping,
                            uptime: process.uptime(),
                        },
                        servers: this.client.guilds.cache.size,
                        users: userCount,
                        tickets: {
                            total: allTickets.length,
                            open: openTickets,
                            closed: closedTickets
                        },
                        modules,
                        hosting: {
                            ram_used: (usedMem / 1024 / 1024 / 1024).toFixed(2) + ' GB',
                            ram_total: (totalMem / 1024 / 1024 / 1024).toFixed(2) + ' GB',
                            ram_percent: ramPercent,
                            cpu_load: cpuLoad,
                            uptime: Math.floor(os.uptime() / 86400) + ' Days'
                        }
                    }
                });
            } catch (err) {
                console.error('[API] Error fetching stats:', err);
                res.status(500).json({ success: false, error: 'Internal Server Error' });
            }
        });

        app.get('/configs/:file', cv('view'), (req, res) => {
            const validFiles = ['supportbot', 'ticket-panel', 'commands', 'messages', 'supportbot-ai'];
            const file = req.params.file;
            if (!validFiles.includes(file)) return res.status(400).json({ success: false, error: 'Invalid file' });
            try {
                const configData = fs.readFileSync(`./Configs/${file}.yml`, 'utf8');
                res.json({ success: true, data: configData });
            } catch (err) {
                res.status(500).json({ success: false, error: 'Failed to read config' });
            }
        });

        app.put('/configs/raw', cv('edit'), async (req, res) => {
            const validFiles = ['supportbot', 'ticket-panel', 'commands', 'messages', 'supportbot-ai'];
            const file = req.body.filename;
            let content = req.body.content;
            if (!validFiles.includes(file)) return res.status(400).json({ success: false, error: 'Invalid file' });
            try {
                if (file === 'supportbot' && /^\s*Token:\s*["']BOT_TOKEN["']/m.test(content)) {
                    const currentPath = `./Configs/${file}.yml`;
                    if (fs.existsSync(currentPath)) {
                        const current = fs.readFileSync(currentPath, 'utf8');
                        const tokenMatch = current.match(/^(\s*Token:\s*)["']([^"']+)["']/m);
                        if (tokenMatch && tokenMatch[2] !== 'BOT_TOKEN') {
                            content = content.replace(
                                /^(\s*Token:\s*)["']BOT_TOKEN["']/m,
                                `$1"${tokenMatch[2]}"`,
                            );
                        }
                    }
                }
                fs.writeFileSync(`./Configs/${file}.yml`, content);
                configStore.reloadFile(file);

                let botRestart = { success: false, error: 'Bot client not available' };
                if (this.client) {
                    botRestart = await this.restartBotAfterConfigSave();
                    notifyBotRestart(botRestart.success, botRestart.error);
                }

                res.json({
                    success: true,
                    botRestart,
                    message: botRestart.success
                        ? 'Config saved and bot restarted. API and dashboard stayed online.'
                        : 'Config saved but the bot could not restart. Check server logs.',
                });
            } catch (err) {
                res.status(500).json({ success: false, error: 'Failed to write config' });
            }
        });

        app.get('/configs/json/:file', cv('view'), (req, res) => {
            const validFiles = ['supportbot', 'ticket-panel', 'commands', 'messages', 'supportbot-ai'];
            const file = req.params.file;
            if (!validFiles.includes(file)) return res.status(400).json({ success: false, error: 'Invalid file' });
            try {
                const configData = yaml.load(fs.readFileSync(`./Configs/${file}.yml`, 'utf8'));
                res.json({ success: true, data: configData });
            } catch (err) {
                res.status(500).json({ success: false, error: 'Failed to parse config' });
            }
        });

        app.post('/configs/update-fields/multi', async (req, res) => {
            const updates = req.body;
            if (!updates || typeof updates !== 'object') return res.status(400).json({ success: false, error: 'Invalid updates' });

            const touchedFiles = new Set();
            for (const keyPath of Object.keys(updates)) {
                touchedFiles.add(keyPath.split(':')[0]);
            }
            if (!req.dashboardService) {
                const denied = assertConfigFilesEditable(
                    req.dashboardPermissions,
                    [...touchedFiles],
                    res,
                );
                if (denied) return;
            }

            try {
                const touched = new Set();
                for (const [keyPath, value] of Object.entries(updates)) {
                    const [fileName, fieldPath] = keyPath.split(':');
                    const fileContent = fs.readFileSync(`./Configs/${fileName}.yml`, 'utf8');
                    const doc = YAML.parseDocument(fileContent);
                    const keys = fieldPath.split('.');
                    doc.setIn(keys, value);
                    fs.writeFileSync(`./Configs/${fileName}.yml`, doc.toString());
                    touched.add(fileName);
                }

                const reloadFiles = [...touched].filter((f) => f !== 'api');

                let botRestart = { success: false, error: 'Bot client not available' };
                if (reloadFiles.length && this.client) {
                    botRestart = await this.restartBotAfterConfigSave();
                    notifyBotRestart(botRestart.success, botRestart.error);
                }

                res.json({
                    success: true,
                    reloaded: reloadFiles,
                    botRestart,
                    message: botRestart.success
                        ? 'Config saved and bot restarted. API and dashboard stayed online.'
                        : 'Config saved but the bot could not restart. Check server logs.',
                });
            } catch (err) {
                console.error('[API] Update failed:', err);
                res.status(500).json({ success: false, error: err.message });
            }
        });

        app.get('/notifications', p('overview'), (req, res) => {
            res.json({
                success: true,
                data: {
                    items: notificationStore.list(),
                    unreadCount: notificationStore.unreadCount(),
                },
            });
        });

        app.post('/notifications/read', p('overview'), (req, res) => {
            const { ids } = req.body || {};
            if (ids === 'all') {
                notificationStore.markRead('all');
            } else if (Array.isArray(ids)) {
                notificationStore.markRead(ids);
            } else if (typeof ids === 'string') {
                notificationStore.markRead([ids]);
            }
            res.json({
                success: true,
                data: { unreadCount: notificationStore.unreadCount() },
            });
        });

        app.delete('/notifications/:id', p('overview'), (req, res) => {
            notificationStore.dismiss(req.params.id);
            res.json({
                success: true,
                data: { unreadCount: notificationStore.unreadCount() },
            });
        });

        app.post('/system/reload-configs', p('settings.update'), async (req, res) => {
            try {
                const file = req.body?.file;
                const valid = ['supportbot', 'ticket-panel', 'commands', 'messages', 'supportbot-ai'];
                if (file && !valid.includes(file)) {
                    return res.status(400).json({ success: false, error: 'Invalid config file' });
                }
                const result = await reloadBot(this.client, {
                    fileKey: file || null,
                    refreshCommands: !file || file === 'commands',
                });
                res.json({
                    success: true,
                    reloaded: result.reloaded,
                    commands: result.commands,
                });
            } catch (err) {
                console.error('[API] Reload failed:', err);
                res.status(500).json({ success: false, error: err.message });
            }
        });

        app.get('/system/logs/meta', p('logs'), (req, res) => {
            try {
                res.json({ success: true, data: { types: LOG_TYPES, files: getLogMeta() } });
            } catch (err) {
                console.error('[API] Log meta failed:', err);
                res.status(500).json({ success: false, error: err.message });
            }
        });

        app.get('/system/logs', p('logs'), (req, res) => {
            try {
                const typesParam = req.query.types;
                const types = typesParam
                    ? String(typesParam).split(',').map((t) => t.trim())
                    : LOG_TYPES;

                let cursor = {};
                if (req.query.cursor) {
                    try {
                        cursor = JSON.parse(String(req.query.cursor));
                    } catch {
                        return res.status(400).json({ success: false, error: 'Invalid cursor' });
                    }
                }

                const hasCursor = Object.keys(cursor).length > 0;
                const tailParam = req.query.tail;
                const initialLines = hasCursor
                    ? 0
                    : Math.min(
                          1000,
                          Math.max(0, parseInt(tailParam, 10) || 400),
                      );

                const { entries, cursor: nextCursor } = fetchLogs(types, cursor, initialLines);

                res.json({
                    success: true,
                    data: {
                        entries,
                        cursor: nextCursor,
                    },
                });
            } catch (err) {
                console.error('[API] Logs fetch failed:', err);
                res.status(500).json({ success: false, error: err.message });
            }
        });

        app.get('/system/update-check', p('settings.view'), async (req, res) => {
            try {
                const info = await runUpdateCheck();
                res.json({ success: true, data: info });
            } catch (err) {
                console.error('[API] Update check failed:', err);
                res.status(500).json({ success: false, error: 'Could not check for updates. Try again later.' });
            }
        });

        app.get('/addons/catalog', p('settings.view'), async (req, res) => {
            try {
                const catalog = await listCatalogAddons();
                const installed = await listInstalledAddons(catalog);
                const installedIds = new Set(installed.map((a) => a.id));
                res.json({
                    success: true,
                    data: {
                        repository: `https://github.com/Emerald-Services/Addons`,
                        addons: catalog.map((addon) => ({
                            ...addon,
                            installed: installedIds.has(addon.id),
                        })),
                    },
                });
            } catch (err) {
                console.error('[API] Addon catalog failed:', err);
                res.status(500).json({
                    success: false,
                    error: err.message || 'Could not load addon catalog from GitHub',
                });
            }
        });

        app.get('/addons/installed', p('settings.view'), async (req, res) => {
            try {
                let catalog = [];
                try {
                    catalog = await listCatalogAddons();
                } catch {
                    catalog = [];
                }
                const installed = await listInstalledAddons(catalog);
                const configs = listLocalAddonConfigs();
                res.json({ success: true, data: { installed, configs } });
            } catch (err) {
                res.status(500).json({ success: false, error: err.message });
            }
        });

        app.post('/addons/install', p('settings.update'), async (req, res) => {
            const name = req.body?.name || req.body?.id;
            if (!name) {
                return res.status(400).json({ success: false, error: 'Missing addon name' });
            }

            try {
                const result = await installAddonFromCatalog(name);
                let botRestart = { success: false, error: 'Bot client not available' };
                if (this.client) {
                    botRestart = await this.restartBotAfterConfigSave();
                    notifyBotRestart(botRestart.success, botRestart.error);
                }

                res.json({
                    success: true,
                    data: result,
                    botRestart,
                    message: botRestart.success
                        ? `${result.addon.name} installed and bot restarted. Enable addons in Bot config if needed.`
                        : `${result.addon.name} installed but the bot could not restart. Check server logs.`,
                });
            } catch (err) {
                console.error('[API] Addon install failed:', err);
                res.status(500).json({ success: false, error: err.message });
            }
        });

        app.get('/addons/configs', p('settings.view'), (req, res) => {
            try {
                const files = listLocalAddonConfigs();
                res.json({ success: true, data: files });
            } catch (err) {
                res.status(500).json({ success: false, error: err.message });
            }
        });

        app.get('/addons/configs/json/:file', (req, res, next) => {
            if (req.dashboardService) return next();
            if (!canAccessConfig(req.dashboardPermissions, 'supportbot', 'view')) {
                return forbid(res);
            }
            return next();
        }, (req, res) => {
            try {
                const parsed = readAddonConfig(req.params.file);
                res.json({ success: true, data: parsed.data, filename: parsed.filename });
            } catch (err) {
                res.status(404).json({ success: false, error: err.message });
            }
        });

        app.put('/addons/configs', (req, res, next) => {
            if (req.dashboardService) return next();
            if (!canAccessConfig(req.dashboardPermissions, 'supportbot', 'edit')) {
                return forbid(res);
            }
            return next();
        }, async (req, res) => {
            const { filename, data } = req.body || {};
            if (!filename || !data || typeof data !== 'object') {
                return res.status(400).json({ success: false, error: 'Missing filename or data' });
            }

            try {
                writeAddonConfig(filename, data);
                let botRestart = { success: false, error: 'Bot client not available' };
                if (this.client) {
                    botRestart = await this.restartBotAfterConfigSave();
                    notifyBotRestart(botRestart.success, botRestart.error);
                }
                res.json({
                    success: true,
                    botRestart,
                    message: botRestart.success
                        ? 'Addon config saved and bot restarted.'
                        : 'Addon config saved but the bot could not restart.',
                });
            } catch (err) {
                console.error('[API] Addon config save failed:', err);
                res.status(500).json({ success: false, error: err.message });
            }
        });

        // --- Nexus Updater API ---
        app.post('/system/update', p('settings.update'), async (req, res) => {
            const { url, version } = req.body;
            const downloadUrl = url || UPDATE_ZIP_URL;

            try {
                const axios = require('axios');
                const { execSync } = require('child_process');
                const path = require('path');

                console.log(`[Updater] Starting update to ${version || 'latest'}...`);

                // 1. Download
                const tempZip = `./update_${Date.now()}.zip`;
                const response = await axios({ method: 'get', url: downloadUrl, responseType: 'stream' });
                const writer = fs.createWriteStream(tempZip);
                response.data.pipe(writer);

                await new Promise((resolve, reject) => {
                    writer.on('finish', resolve);
                    writer.on('error', reject);
                });

                // 2. Extract to temp dir
                const tempDir = `./temp_update_${Date.now()}`;
                if (!fs.existsSync(tempDir)) fs.mkdirSync(tempDir);

                const isWindows = process.platform === 'win32';
                try {
                    if (isWindows) {
                        execSync(`powershell -Command "Expand-Archive -Path '${tempZip}' -DestinationPath '${tempDir}' -Force"`);
                    } else {
                        execSync(`unzip -o "${tempZip}" -d "${tempDir}"`);
                    }
                } catch (e) {
                    throw new Error(`Extraction failed. Ensure ${isWindows ? 'PowerShell' : 'unzip'} is installed. ${e.message}`);
                }

                // Identify inner directory (sometimes zips contain a root folder)
                let sourcePath = tempDir;
                const items = fs.readdirSync(tempDir);
                if (items.length === 1 && fs.statSync(path.join(tempDir, items[0])).isDirectory()) {
                    sourcePath = path.join(tempDir, items[0]);
                }

                // 3. Smart Config Merge
                const configFiles = ['supportbot', 'commands', 'messages', 'ticket-panel', 'supportbot-ai'];
                configFiles.forEach(cf => {
                    const currentPath = `./Configs/${cf}.yml`;
                    const newPath = path.join(sourcePath, 'Configs', `${cf}.yml`);

                    if (fs.existsSync(currentPath) && fs.existsSync(newPath)) {
                        const currentCfg = yaml.load(fs.readFileSync(currentPath, 'utf8'));
                        const newCfg = yaml.load(fs.readFileSync(newPath, 'utf8'));

                        const merge = (target, source) => {
                            for (const key of Object.keys(source)) {
                                if (source[key] instanceof Object && !Array.isArray(source[key]) && target[key]) {
                                    merge(target[key], source[key]);
                                } else if (target[key] === undefined) {
                                    target[key] = source[key];
                                    console.log(`[Updater] Added missing key: ${key} to ${cf}.yml`);
                                }
                            }
                        };
                        merge(currentCfg, newCfg);
                        fs.writeFileSync(currentPath, YAML.stringify(currentCfg));
                    }
                });

                // 4. Overwrite core folders (keep Configs + Data)
                const coreFolders = ['API', 'Commands', 'Events', 'Structures', 'public'];
                coreFolders.forEach(folder => {
                    const src = path.join(sourcePath, folder);
                    if (fs.existsSync(src)) {
                        if (isWindows) {
                            execSync(`xcopy "${src}" ".\\${folder}" /E /I /Y`);
                        } else {
                            execSync(`cp -R "${src}/"* "./${folder}/"`);
                        }
                    }
                });

                // 5. Update package.json (version only)
                const newPkgPath = path.join(sourcePath, 'package.json');
                if (fs.existsSync(newPkgPath)) {
                    const currentPkg = JSON.parse(fs.readFileSync('./package.json', 'utf8'));
                    const newPkg = JSON.parse(fs.readFileSync(newPkgPath, 'utf8'));
                    currentPkg.version = newPkg.version;
                    fs.writeFileSync('./package.json', JSON.stringify(currentPkg, null, 2));
                }

                fs.unlinkSync(tempZip);
                if (isWindows) {
                    execSync(`rmdir /s /q "${tempDir}"`);
                } else {
                    execSync(`rm -rf "${tempDir}"`);
                }

                if (fs.existsSync(path.join(sourcePath, 'index.js'))) {
                    fs.copyFileSync(path.join(sourcePath, 'index.js'), './index.js');
                }

                configStore.reloadBotConfigs();
                if (this.client) {
                    await reloadBot(this.client, { refreshCommands: true });
                }

                const updateMessage =
                    'Update installed. Please restart your server (stop and run npm start again) to apply all file changes.';
                notifyUpdateInstalled(updateMessage);

                res.json({
                    success: true,
                    message: updateMessage,
                    restartRequired: true,
                });

            } catch (err) {
                console.error('[Updater] Update failed:', err);
                notificationStore.add({
                    type: 'error',
                    title: 'Update failed',
                    message: err.message,
                    href: '/settings',
                });
                res.status(500).json({ success: false, error: err.message });
            }
        });

        // --- Transcript API ---
        app.get('/system/transcripts', p('transcripts'), (req, res) => {
            const transcriptDir = './Data/Transcripts';
            try {
                if (!fs.existsSync(transcriptDir)) {
                    return res.json({ success: true, data: [] });
                }
                const files = fs.readdirSync(transcriptDir);
                const transcripts = files
                    .filter(f => f.endsWith('-transcript.html'))
                    .map(f => {
                        const stats = fs.statSync(`${transcriptDir}/${f}`);
                        return {
                            id: f.replace('-transcript.html', ''),
                            filename: f,
                            createdAt: stats.mtime
                        };
                    })
                    .sort((a, b) => b.createdAt - a.createdAt);
                res.json({ success: true, data: transcripts });
            } catch (err) {
                res.status(500).json({ success: false, error: 'Failed to list transcripts' });
            }
        });

        app.get('/system/transcripts/:id', p('transcripts'), (req, res) => {
            const id = req.params.id.replace(/[^0-9]/g, ''); // Sanitize ID
            const filePath = `./Data/Transcripts/${id}-transcript.html`;
            try {
                if (!fs.existsSync(filePath)) {
                    return res.status(404).json({ success: false, error: 'Transcript not found' });
                }
                const content = fs.readFileSync(filePath, 'utf8');
                res.json({ success: true, data: content });
            } catch (err) {
                res.status(500).json({ success: false, error: 'Failed to read transcript' });
            }
        });
    }
}

module.exports = APIServer;