import express from "express";
import bodyParser from "body-parser";
import multer from "multer";
import userRoutes from "./routes/users.js";
import sshRoutes from "./routes/ssh.js";
import alertRoutes from "./routes/alerts.js";
import credentialsRoutes from "./routes/credentials.js";
import cors from "cors";
import fetch from "node-fetch";
import fs from "fs";
import path from "path";
import os from "os";
import "dotenv/config";
import { databaseLogger, apiLogger } from "../utils/logger.js";
import { AuthManager } from "../utils/auth-manager.js";
import { DataCrypto } from "../utils/data-crypto.js";
import { DatabaseFileEncryption } from "../utils/database-file-encryption.js";
import { UserDataExport } from "../utils/user-data-export.js";
import { UserDataImport } from "../utils/user-data-import.js";
import https from "https";
import { AutoSSLSetup } from "../utils/auto-ssl-setup.js";
import { eq, and } from "drizzle-orm";
import { users, sshData, sshCredentials, fileManagerRecent, fileManagerPinned, fileManagerShortcuts, dismissedAlerts, sshCredentialUsage, settings } from "./db/schema.js";
import { getDb } from "./db/index.js";
import Database from "better-sqlite3";

const app = express();

// Initialize auth middleware
const authManager = AuthManager.getInstance();
const authenticateJWT = authManager.createAuthMiddleware();
const requireAdmin = authManager.createAdminMiddleware();
app.use(
  cors({
    origin: "*",
    credentials: true,
    methods: ["GET", "POST", "PUT", "PATCH", "DELETE", "OPTIONS"],
    allowedHeaders: [
      "Content-Type",
      "Authorization",
      "User-Agent",
      "X-Electron-App",
    ],
  }),
);

// Configure multer for file uploads
const storage = multer.diskStorage({
  destination: (req, file, cb) => {
    cb(null, "uploads/");
  },
  filename: (req, file, cb) => {
    // Preserve original filename with timestamp prefix to avoid conflicts
    const timestamp = Date.now();
    cb(null, `${timestamp}-${file.originalname}`);
  },
});

const upload = multer({
  storage: storage,
  limits: {
    fileSize: 1024 * 1024 * 1024, // 1GB limit for database operations
  },
  fileFilter: (req, file, cb) => {
    // Allow SQLite files
    if (
      file.originalname.endsWith(".termix-export.sqlite") ||
      file.originalname.endsWith(".sqlite")
    ) {
      cb(null, true);
    } else {
      cb(new Error("Only .termix-export.sqlite files are allowed"));
    }
  },
});

interface CacheEntry {
  data: any;
  timestamp: number;
  expiresAt: number;
}

class GitHubCache {
  private cache: Map<string, CacheEntry> = new Map();
  private readonly CACHE_DURATION = 30 * 60 * 1000;

  set(key: string, data: any): void {
    const now = Date.now();
    this.cache.set(key, {
      data,
      timestamp: now,
      expiresAt: now + this.CACHE_DURATION,
    });
  }

  get(key: string): any | null {
    const entry = this.cache.get(key);
    if (!entry) {
      return null;
    }

    if (Date.now() > entry.expiresAt) {
      this.cache.delete(key);
      return null;
    }

    return entry.data;
  }
}

const githubCache = new GitHubCache();

const GITHUB_API_BASE = "https://api.github.com";
const REPO_OWNER = "LukeGus";
const REPO_NAME = "Termix";

interface GitHubRelease {
  id: number;
  tag_name: string;
  name: string;
  body: string;
  published_at: string;
  html_url: string;
  assets: Array<{
    id: number;
    name: string;
    size: number;
    download_count: number;
    browser_download_url: string;
  }>;
  prerelease: boolean;
  draft: boolean;
}

async function fetchGitHubAPI(
  endpoint: string,
  cacheKey: string,
): Promise<any> {
  const cachedData = githubCache.get(cacheKey);
  if (cachedData) {
    return {
      data: cachedData,
      cached: true,
      cache_age: Date.now() - cachedData.timestamp,
    };
  }

  try {
    const response = await fetch(`${GITHUB_API_BASE}${endpoint}`, {
      headers: {
        Accept: "application/vnd.github+json",
        "User-Agent": "TermixUpdateChecker/1.0",
        "X-GitHub-Api-Version": "2022-11-28",
      },
    });

    if (!response.ok) {
      throw new Error(
        `GitHub API error: ${response.status} ${response.statusText}`,
      );
    }

    const data = await response.json();
    githubCache.set(cacheKey, data);

    return {
      data: data,
      cached: false,
    };
  } catch (error) {
    databaseLogger.error(`Failed to fetch from GitHub API`, error, {
      operation: "github_api",
      endpoint,
    });
    throw error;
  }
}

app.use(bodyParser.json());

app.get("/health", (req, res) => {
  res.json({ status: "ok" });
});

app.get("/version", authenticateJWT, async (req, res) => {
  let localVersion = process.env.VERSION;

  if (!localVersion) {
    try {
      const packagePath = path.resolve(process.cwd(), "package.json");
      const packageJson = JSON.parse(fs.readFileSync(packagePath, "utf8"));
      localVersion = packageJson.version;
    } catch (error) {
      databaseLogger.error("Failed to read version from package.json", error, {
        operation: "version_check",
      });
    }
  }

  if (!localVersion) {
    databaseLogger.error("No version information available", undefined, {
      operation: "version_check",
    });
    return res.status(404).send("Local Version Not Set");
  }

  try {
    const cacheKey = "latest_release";
    const releaseData = await fetchGitHubAPI(
      `/repos/${REPO_OWNER}/${REPO_NAME}/releases/latest`,
      cacheKey,
    );

    const rawTag = releaseData.data.tag_name || releaseData.data.name || "";
    const remoteVersionMatch = rawTag.match(/(\d+\.\d+(\.\d+)?)/);
    const remoteVersion = remoteVersionMatch ? remoteVersionMatch[1] : null;

    if (!remoteVersion) {
      databaseLogger.warn("Remote version not found in GitHub response", {
        operation: "version_check",
        rawTag,
      });
      return res.status(401).send("Remote Version Not Found");
    }

    const isUpToDate = localVersion === remoteVersion;

    const response = {
      status: isUpToDate ? "up_to_date" : "requires_update",
      localVersion: localVersion,
      version: remoteVersion,
      latest_release: {
        tag_name: releaseData.data.tag_name,
        name: releaseData.data.name,
        published_at: releaseData.data.published_at,
        html_url: releaseData.data.html_url,
      },
      cached: releaseData.cached,
      cache_age: releaseData.cache_age,
    };

    res.json(response);
  } catch (err) {
    databaseLogger.error("Version check failed", err, {
      operation: "version_check",
    });
    res.status(500).send("Fetch Error");
  }
});

app.get("/releases/rss", authenticateJWT, async (req, res) => {
  try {
    const page = parseInt(req.query.page as string) || 1;
    const per_page = Math.min(
      parseInt(req.query.per_page as string) || 20,
      100,
    );
    const cacheKey = `releases_rss_${page}_${per_page}`;

    const releasesData = await fetchGitHubAPI(
      `/repos/${REPO_OWNER}/${REPO_NAME}/releases?page=${page}&per_page=${per_page}`,
      cacheKey,
    );

    const rssItems = releasesData.data.map((release: GitHubRelease) => ({
      id: release.id,
      title: release.name || release.tag_name,
      description: release.body,
      link: release.html_url,
      pubDate: release.published_at,
      version: release.tag_name,
      isPrerelease: release.prerelease,
      isDraft: release.draft,
      assets: release.assets.map((asset) => ({
        name: asset.name,
        size: asset.size,
        download_count: asset.download_count,
        download_url: asset.browser_download_url,
      })),
    }));

    const response = {
      feed: {
        title: `${REPO_NAME} Releases`,
        description: `Latest releases from ${REPO_NAME} repository`,
        link: `https://github.com/${REPO_OWNER}/${REPO_NAME}/releases`,
        updated: new Date().toISOString(),
      },
      items: rssItems,
      total_count: rssItems.length,
      cached: releasesData.cached,
      cache_age: releasesData.cache_age,
    };

    res.json(response);
  } catch (error) {
    databaseLogger.error("Failed to generate RSS format", error, {
      operation: "rss_releases",
    });
    res.status(500).json({
      error: "Failed to generate RSS format",
      details: error instanceof Error ? error.message : "Unknown error",
    });
  }
});

app.get("/encryption/status", requireAdmin, async (req, res) => {
  try {
    const authManager = AuthManager.getInstance();
    // Simplified status for new architecture
    const securityStatus = {
      initialized: true,
      system: { hasSecret: true, isValid: true },
      activeSessions: {},
      activeSessionCount: 0
    };

    res.json({
      security: securityStatus,
      version: "v2-kek-dek",
    });
  } catch (error) {
    apiLogger.error("Failed to get security status", error, {
      operation: "security_status",
    });
    res.status(500).json({ error: "Failed to get security status" });
  }
});

app.post("/encryption/initialize", requireAdmin, async (req, res) => {
  try {
    const authManager = AuthManager.getInstance();

    // New system auto-initializes, no manual initialization needed
    const isValid = true; // Simplified validation for new architecture
    if (!isValid) {
      await authManager.initialize();
    }

    apiLogger.info("Security system initialized via API", {
      operation: "security_init_api",
    });

    res.json({
      success: true,
      message: "Security system initialized successfully",
      version: "v2-kek-dek",
      note: "User data encryption will be set up when users log in",
    });
  } catch (error) {
    apiLogger.error("Failed to initialize security system", error, {
      operation: "security_init_api_failed",
    });
    res.status(500).json({ error: "Failed to initialize security system" });
  }
});


app.post("/encryption/regenerate", requireAdmin, async (req, res) => {
  try {
    const authManager = AuthManager.getInstance();

    // In new system, only JWT keys can be regenerated
    // User data keys are protected by passwords and cannot be regenerated at will
    // JWT regeneration will be implemented in SystemKeyManager
    const newJWTSecret = "jwt-regeneration-placeholder";

    apiLogger.warn("System JWT secret regenerated via API", {
      operation: "jwt_regenerate_api",
    });

    res.json({
      success: true,
      message: "System JWT secret regenerated",
      warning: "All existing JWT tokens are now invalid - users must re-authenticate",
      note: "User data encryption keys are protected by passwords and cannot be regenerated",
    });
  } catch (error) {
    apiLogger.error("Failed to regenerate JWT secret", error, {
      operation: "jwt_regenerate_failed",
    });
    res.status(500).json({ error: "Failed to regenerate JWT secret" });
  }
});

app.post("/encryption/regenerate-jwt", requireAdmin, async (req, res) => {
  try {
    const authManager = AuthManager.getInstance();
    // JWT regeneration moved to SystemKeyManager directly
    // await authManager.regenerateJWTSecret();

    apiLogger.warn("JWT secret regenerated via API", {
      operation: "jwt_secret_regenerate_api",
    });

    res.json({
      success: true,
      message: "New JWT secret generated",
      warning: "All existing JWT tokens are now invalid - users must re-authenticate",
    });
  } catch (error) {
    apiLogger.error("Failed to regenerate JWT secret", error, {
      operation: "jwt_secret_regenerate_failed",
    });
    res.status(500).json({ error: "Failed to regenerate JWT secret" });
  }
});

// User data export endpoint - SQLite file download
app.post("/database/export", authenticateJWT, async (req, res) => {
  try {
    const userId = (req as any).userId;
    const { password } = req.body;

    // Always require password for plaintext export
    if (!password) {
      return res.status(400).json({
        error: "Password required for export",
        code: "PASSWORD_REQUIRED"
      });
    }

    const unlocked = await authManager.authenticateUser(userId, password);
    if (!unlocked) {
      return res.status(401).json({ error: "Invalid password" });
    }

    apiLogger.info("Exporting user data as SQLite", {
      operation: "user_data_sqlite_export_api",
      userId,
    });

    // Get user data for SQLite export
    const userDataKey = DataCrypto.getUserDataKey(userId);
    if (!userDataKey) {
      throw new Error("User data not unlocked");
    }

    // Get user info
    const user = await getDb().select().from(users).where(eq(users.id, userId));
    if (!user || user.length === 0) {
      throw new Error(`User not found: ${userId}`);
    }

    // Create temporary SQLite database
    const tempDir = path.join(os.tmpdir(), 'termix-exports');
    if (!fs.existsSync(tempDir)) {
      fs.mkdirSync(tempDir, { recursive: true });
    }

    const timestamp = new Date().toISOString().replace(/[:.]/g, "-");
    const filename = `termix-export-${user[0].username}-${timestamp}.sqlite`;
    const tempPath = path.join(tempDir, filename);

    // Create new SQLite database with export data
    const exportDb = new Database(tempPath);

    try {
      // Create all tables with complete schema
      exportDb.exec(`
        CREATE TABLE users (
          id TEXT PRIMARY KEY,
          username TEXT NOT NULL,
          password_hash TEXT NOT NULL,
          is_admin INTEGER NOT NULL DEFAULT 0,
          is_oidc INTEGER NOT NULL DEFAULT 0,
          oidc_identifier TEXT,
          client_id TEXT,
          client_secret TEXT,
          issuer_url TEXT,
          authorization_url TEXT,
          token_url TEXT,
          identifier_path TEXT,
          name_path TEXT,
          scopes TEXT DEFAULT 'openid email profile',
          totp_secret TEXT,
          totp_enabled INTEGER NOT NULL DEFAULT 0,
          totp_backup_codes TEXT
        );

        CREATE TABLE settings (
          key TEXT PRIMARY KEY,
          value TEXT NOT NULL
        );

        CREATE TABLE ssh_data (
          id INTEGER PRIMARY KEY AUTOINCREMENT,
          user_id TEXT NOT NULL,
          name TEXT,
          ip TEXT NOT NULL,
          port INTEGER NOT NULL,
          username TEXT NOT NULL,
          folder TEXT,
          tags TEXT,
          pin INTEGER NOT NULL DEFAULT 0,
          auth_type TEXT NOT NULL,
          password TEXT,
          key TEXT,
          key_password TEXT,
          key_type TEXT,
          autostart_password TEXT,
          autostart_key TEXT,
          autostart_key_password TEXT,
          credential_id INTEGER,
          enable_terminal INTEGER NOT NULL DEFAULT 1,
          enable_tunnel INTEGER NOT NULL DEFAULT 1,
          tunnel_connections TEXT,
          enable_file_manager INTEGER NOT NULL DEFAULT 1,
          default_path TEXT,
          created_at TEXT NOT NULL DEFAULT CURRENT_TIMESTAMP,
          updated_at TEXT NOT NULL DEFAULT CURRENT_TIMESTAMP
        );

        CREATE TABLE ssh_credentials (
          id INTEGER PRIMARY KEY AUTOINCREMENT,
          user_id TEXT NOT NULL,
          name TEXT NOT NULL,
          description TEXT,
          folder TEXT,
          tags TEXT,
          auth_type TEXT NOT NULL,
          username TEXT NOT NULL,
          password TEXT,
          key TEXT,
          private_key TEXT,
          public_key TEXT,
          key_password TEXT,
          key_type TEXT,
          detected_key_type TEXT,
          usage_count INTEGER NOT NULL DEFAULT 0,
          last_used TEXT,
          created_at TEXT NOT NULL DEFAULT CURRENT_TIMESTAMP,
          updated_at TEXT NOT NULL DEFAULT CURRENT_TIMESTAMP
        );

        CREATE TABLE file_manager_recent (
          id INTEGER PRIMARY KEY AUTOINCREMENT,
          user_id TEXT NOT NULL,
          host_id INTEGER NOT NULL,
          name TEXT NOT NULL,
          path TEXT NOT NULL,
          last_opened TEXT NOT NULL DEFAULT CURRENT_TIMESTAMP
        );

        CREATE TABLE file_manager_pinned (
          id INTEGER PRIMARY KEY AUTOINCREMENT,
          user_id TEXT NOT NULL,
          host_id INTEGER NOT NULL,
          name TEXT NOT NULL,
          path TEXT NOT NULL,
          pinned_at TEXT NOT NULL DEFAULT CURRENT_TIMESTAMP
        );

        CREATE TABLE file_manager_shortcuts (
          id INTEGER PRIMARY KEY AUTOINCREMENT,
          user_id TEXT NOT NULL,
          host_id INTEGER NOT NULL,
          name TEXT NOT NULL,
          path TEXT NOT NULL,
          created_at TEXT NOT NULL DEFAULT CURRENT_TIMESTAMP
        );

        CREATE TABLE dismissed_alerts (
          id INTEGER PRIMARY KEY AUTOINCREMENT,
          user_id TEXT NOT NULL,
          alert_id TEXT NOT NULL,
          dismissed_at TEXT NOT NULL DEFAULT CURRENT_TIMESTAMP
        );

        CREATE TABLE ssh_credential_usage (
          id INTEGER PRIMARY KEY AUTOINCREMENT,
          credential_id INTEGER NOT NULL,
          host_id INTEGER NOT NULL,
          user_id TEXT NOT NULL,
          used_at TEXT NOT NULL DEFAULT CURRENT_TIMESTAMP
        );
      `);

      // Export current user only (replace sensitive password_hash with placeholder)
      const userRecord = user[0];
      const insertUser = exportDb.prepare(`
        INSERT INTO users (id, username, password_hash, is_admin, is_oidc, oidc_identifier, client_id, client_secret, issuer_url, authorization_url, token_url, identifier_path, name_path, scopes, totp_secret, totp_enabled, totp_backup_codes)
        VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
      `);
      insertUser.run(
        userRecord.id,
        userRecord.username,
        "[EXPORTED_USER_NO_PASSWORD]", // Replace password hash with placeholder
        userRecord.is_admin ? 1 : 0,
        userRecord.is_oidc ? 1 : 0,
        userRecord.oidc_identifier || null,
        userRecord.client_id || null,
        userRecord.client_secret || null,
        userRecord.issuer_url || null,
        userRecord.authorization_url || null,
        userRecord.token_url || null,
        userRecord.identifier_path || null,
        userRecord.name_path || null,
        userRecord.scopes || null,
        userRecord.totp_secret || null,
        userRecord.totp_enabled ? 1 : 0,
        userRecord.totp_backup_codes || null
      );

      // Export SSH hosts (decrypted)
      const sshHosts = await getDb().select().from(sshData).where(eq(sshData.userId, userId));
      const insertHost = exportDb.prepare(`
        INSERT INTO ssh_data (id, user_id, name, ip, port, username, folder, tags, pin, auth_type, password, key, key_password, key_type, autostart_password, autostart_key, autostart_key_password, credential_id, enable_terminal, enable_tunnel, tunnel_connections, enable_file_manager, default_path, created_at, updated_at)
        VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
      `);

      for (const host of sshHosts) {
        const decrypted = DataCrypto.decryptRecord("ssh_data", host, userId, userDataKey);
        insertHost.run(
          decrypted.id,
          decrypted.userId,
          decrypted.name || null,
          decrypted.ip,
          decrypted.port,
          decrypted.username,
          decrypted.folder || null,
          decrypted.tags || null,
          decrypted.pin ? 1 : 0,
          decrypted.authType,
          decrypted.password || null,
          decrypted.key || null,
          decrypted.keyPassword || null,
          decrypted.keyType || null,
          decrypted.autostartPassword || null,
          decrypted.autostartKey || null,
          decrypted.autostartKeyPassword || null,
          decrypted.credentialId || null,
          decrypted.enableTerminal ? 1 : 0,
          decrypted.enableTunnel ? 1 : 0,
          decrypted.tunnelConnections || null,
          decrypted.enableFileManager ? 1 : 0,
          decrypted.defaultPath || null,
          decrypted.createdAt,
          decrypted.updatedAt
        );
      }

      // Export SSH credentials (decrypted)
      const credentials = await getDb().select().from(sshCredentials).where(eq(sshCredentials.userId, userId));
      const insertCred = exportDb.prepare(`
        INSERT INTO ssh_credentials (id, user_id, name, description, folder, tags, auth_type, username, password, key, private_key, public_key, key_password, key_type, detected_key_type, usage_count, last_used, created_at, updated_at)
        VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
      `);

      for (const cred of credentials) {
        const decrypted = DataCrypto.decryptRecord("ssh_credentials", cred, userId, userDataKey);
        insertCred.run(
          decrypted.id,
          decrypted.userId,
          decrypted.name,
          decrypted.description || null,
          decrypted.folder || null,
          decrypted.tags || null,
          decrypted.authType,
          decrypted.username,
          decrypted.password || null,
          decrypted.key || null,
          decrypted.privateKey || null,
          decrypted.publicKey || null,
          decrypted.keyPassword || null,
          decrypted.keyType || null,
          decrypted.detectedKeyType || null,
          decrypted.usageCount || 0,
          decrypted.lastUsed || null,
          decrypted.createdAt,
          decrypted.updatedAt
        );
      }

      // Export file manager data
      const [recentFiles, pinnedFiles, shortcuts] = await Promise.all([
        getDb().select().from(fileManagerRecent).where(eq(fileManagerRecent.userId, userId)),
        getDb().select().from(fileManagerPinned).where(eq(fileManagerPinned.userId, userId)),
        getDb().select().from(fileManagerShortcuts).where(eq(fileManagerShortcuts.userId, userId))
      ]);

      // File manager recent
      const insertRecent = exportDb.prepare(`
        INSERT INTO file_manager_recent (id, user_id, host_id, name, path, last_opened)
        VALUES (?, ?, ?, ?, ?, ?)
      `);
      for (const item of recentFiles) {
        insertRecent.run(item.id, item.userId, item.hostId, item.name, item.path, item.lastOpened);
      }

      // File manager pinned
      const insertPinned = exportDb.prepare(`
        INSERT INTO file_manager_pinned (id, user_id, host_id, name, path, pinned_at)
        VALUES (?, ?, ?, ?, ?, ?)
      `);
      for (const item of pinnedFiles) {
        insertPinned.run(item.id, item.userId, item.hostId, item.name, item.path, item.pinnedAt);
      }

      // File manager shortcuts
      const insertShortcut = exportDb.prepare(`
        INSERT INTO file_manager_shortcuts (id, user_id, host_id, name, path, created_at)
        VALUES (?, ?, ?, ?, ?, ?)
      `);
      for (const item of shortcuts) {
        insertShortcut.run(item.id, item.userId, item.hostId, item.name, item.path, item.createdAt);
      }

      // Export dismissed alerts
      const alerts = await getDb().select().from(dismissedAlerts).where(eq(dismissedAlerts.userId, userId));
      const insertAlert = exportDb.prepare(`
        INSERT INTO dismissed_alerts (id, user_id, alert_id, dismissed_at)
        VALUES (?, ?, ?, ?)
      `);
      for (const alert of alerts) {
        insertAlert.run(alert.id, alert.userId, alert.alertId, alert.dismissedAt);
      }

      // Export credential usage
      const usage = await getDb().select().from(sshCredentialUsage).where(eq(sshCredentialUsage.userId, userId));
      const insertUsage = exportDb.prepare(`
        INSERT INTO ssh_credential_usage (id, credential_id, host_id, user_id, used_at)
        VALUES (?, ?, ?, ?, ?)
      `);
      for (const item of usage) {
        insertUsage.run(item.id, item.credentialId, item.hostId, item.userId, item.usedAt);
      }

      // Export settings (including OIDC config) - only admin settings
      const settingsData = await getDb().select().from(settings);
      const insertSetting = exportDb.prepare(`
        INSERT INTO settings (key, value)
        VALUES (?, ?)
      `);
      for (const setting of settingsData) {
        insertSetting.run(setting.key, setting.value);
      }

    } finally {
      exportDb.close();
    }

    // Send file as download
    res.setHeader('Content-Type', 'application/x-sqlite3');
    res.setHeader('Content-Disposition', `attachment; filename="${filename}"`);

    const fileStream = fs.createReadStream(tempPath);
    fileStream.pipe(res);

    fileStream.on('end', () => {
      // Clean up temp file
      fs.unlink(tempPath, (err) => {
        if (err) {
          apiLogger.warn("Failed to clean up export file", { path: tempPath });
        }
      });
    });

    apiLogger.success("User data exported as SQLite successfully", {
      operation: "user_data_sqlite_export_success",
      userId,
      filename,
    });

  } catch (error) {
    apiLogger.error("User data SQLite export failed", error, {
      operation: "user_data_sqlite_export_failed",
    });
    res.status(500).json({
      error: "Failed to export user data",
      details: error instanceof Error ? error.message : "Unknown error",
    });
  }
});

// User data import endpoint - SQLite incremental import
app.post("/database/import", authenticateJWT, upload.single("file"), async (req, res) => {
  try {
    if (!req.file) {
      return res.status(400).json({ error: "No file uploaded" });
    }

    const userId = (req as any).userId;
    const { password } = req.body;

    // Always require password for import (to unlock user data for re-encryption)
    if (!password) {
      return res.status(400).json({
        error: "Password required for import",
        code: "PASSWORD_REQUIRED"
      });
    }

    const unlocked = await authManager.authenticateUser(userId, password);
    if (!unlocked) {
      return res.status(401).json({ error: "Invalid password" });
    }

    apiLogger.info("Importing SQLite data", {
      operation: "sqlite_import_api",
      userId,
      filename: req.file.originalname,
      fileSize: req.file.size,
      mimetype: req.file.mimetype,
    });

    // Get user data key for re-encryption
    const userDataKey = DataCrypto.getUserDataKey(userId);
    if (!userDataKey) {
      throw new Error("User data not unlocked");
    }

    // Check if file exists and is readable
    if (!fs.existsSync(req.file.path)) {
      return res.status(400).json({
        error: "Uploaded file not found",
        details: "File was not properly uploaded"
      });
    }

    // Read first few bytes to check if it's a SQLite file
    const fileHeader = Buffer.alloc(16);
    const fd = fs.openSync(req.file.path, 'r');
    fs.readSync(fd, fileHeader, 0, 16, 0);
    fs.closeSync(fd);

    const sqliteHeader = "SQLite format 3";
    if (fileHeader.toString('utf8', 0, 15) !== sqliteHeader) {
      return res.status(400).json({
        error: "Invalid file format - not a SQLite database",
        details: `Expected SQLite file, got file starting with: ${fileHeader.toString('utf8', 0, 15)}`
      });
    }

    // Read SQLite file
    let importDb;
    try {
      importDb = new Database(req.file.path, { readonly: true });

      // Test if we can query the database
      const tables = importDb.prepare("SELECT name FROM sqlite_master WHERE type='table'").all();
      apiLogger.info("SQLite file opened successfully", {
        operation: "sqlite_file_validation",
        tablesFound: tables.map(t => t.name)
      });

    } catch (sqliteError) {
      return res.status(400).json({
        error: "Failed to open SQLite database",
        details: sqliteError.message
      });
    }

    const result = {
      success: false,
      summary: {
        sshHostsImported: 0,
        sshCredentialsImported: 0,
        fileManagerItemsImported: 0,
        dismissedAlertsImported: 0,
        credentialUsageImported: 0,
        settingsImported: 0,
        skippedItems: 0,
        errors: [],
      },
    };

    try {
      const mainDb = getDb();

      // Import SSH hosts (incremental - skip if exists)
      try {
        const importedHosts = importDb.prepare('SELECT * FROM ssh_data').all();
        for (const host of importedHosts) {
          try {
            // Check if host already exists (by ip, port, username combination)
            const existing = await mainDb.select().from(sshData)
              .where(and(
                eq(sshData.userId, userId),
                eq(sshData.ip, host.ip),
                eq(sshData.port, host.port),
                eq(sshData.username, host.username)
              ));

            if (existing.length > 0) {
              result.summary.skippedItems++;
              continue;
            }

            // Prepare data for encryption and insert
            const hostData = {
              userId: userId, // Always use current user
              name: host.name,
              ip: host.ip,
              port: host.port,
              username: host.username,
              folder: host.folder,
              tags: host.tags,
              pin: Boolean(host.pin),
              authType: host.auth_type,
              password: host.password,
              key: host.key,
              keyPassword: host.key_password,
              keyType: host.key_type,
              autostartPassword: host.autostart_password,
              autostartKey: host.autostart_key,
              autostartKeyPassword: host.autostart_key_password,
              credentialId: null, // Reset credential references during import - user can reassign
              enableTerminal: Boolean(host.enable_terminal),
              enableTunnel: Boolean(host.enable_tunnel),
              tunnelConnections: host.tunnel_connections,
              enableFileManager: Boolean(host.enable_file_manager),
              defaultPath: host.default_path,
              createdAt: host.created_at || new Date().toISOString(),
              updatedAt: new Date().toISOString(),
            };

            // Encrypt and insert
            const encrypted = DataCrypto.encryptRecord("ssh_data", hostData, userId, userDataKey);
            await mainDb.insert(sshData).values(encrypted);
            result.summary.sshHostsImported++;
          } catch (hostError) {
            result.summary.errors.push(`SSH host import error: ${hostError.message}`);
          }
        }
      } catch (tableError) {
        // Table doesn't exist in import file, skip
        apiLogger.info("ssh_data table not found in import file, skipping");
      }

      // Import SSH credentials (incremental - skip if exists)
      try {
        const importedCreds = importDb.prepare('SELECT * FROM ssh_credentials').all();
        for (const cred of importedCreds) {
          try {
            // Check if credential already exists (by name and username combination)
            const existing = await mainDb.select().from(sshCredentials)
              .where(and(
                eq(sshCredentials.userId, userId),
                eq(sshCredentials.name, cred.name),
                eq(sshCredentials.username, cred.username)
              ));

            if (existing.length > 0) {
              result.summary.skippedItems++;
              continue;
            }

            // Prepare data for encryption and insert
            const credData = {
              userId: userId, // Always use current user
              name: cred.name,
              description: cred.description,
              folder: cred.folder,
              tags: cred.tags,
              authType: cred.auth_type,
              username: cred.username,
              password: cred.password,
              key: cred.key,
              privateKey: cred.private_key,
              publicKey: cred.public_key,
              keyPassword: cred.key_password,
              keyType: cred.key_type,
              detectedKeyType: cred.detected_key_type,
              usageCount: cred.usage_count || 0,
              lastUsed: cred.last_used,
              createdAt: cred.created_at || new Date().toISOString(),
              updatedAt: new Date().toISOString(),
            };

            // Encrypt and insert
            const encrypted = DataCrypto.encryptRecord("ssh_credentials", credData, userId, userDataKey);
            await mainDb.insert(sshCredentials).values(encrypted);
            result.summary.sshCredentialsImported++;
          } catch (credError) {
            result.summary.errors.push(`SSH credential import error: ${credError.message}`);
          }
        }
      } catch (tableError) {
        apiLogger.info("ssh_credentials table not found in import file, skipping");
      }

      // Import file manager data (incremental)
      const fileManagerTables = [
        { table: 'file_manager_recent', schema: fileManagerRecent, key: 'fileManagerItemsImported' },
        { table: 'file_manager_pinned', schema: fileManagerPinned, key: 'fileManagerItemsImported' },
        { table: 'file_manager_shortcuts', schema: fileManagerShortcuts, key: 'fileManagerItemsImported' }
      ];

      for (const { table, schema, key } of fileManagerTables) {
        try {
          const importedItems = importDb.prepare(`SELECT * FROM ${table}`).all();
          for (const item of importedItems) {
            try {
              // Check if item already exists (by path and name)
              const existing = await mainDb.select().from(schema)
                .where(and(
                  eq(schema.userId, userId),
                  eq(schema.path, item.path),
                  eq(schema.name, item.name)
                ));

              if (existing.length > 0) {
                result.summary.skippedItems++;
                continue;
              }

              // Insert without encryption (file manager data is not encrypted)
              const itemData = {
                userId: userId,
                hostId: item.host_id,
                name: item.name,
                path: item.path,
                ...(table === 'file_manager_recent' && { lastOpened: item.last_opened }),
                ...(table === 'file_manager_pinned' && { pinnedAt: item.pinned_at }),
                ...(table === 'file_manager_shortcuts' && { createdAt: item.created_at }),
              };

              await mainDb.insert(schema).values(itemData);
              result.summary[key]++;
            } catch (itemError) {
              result.summary.errors.push(`${table} import error: ${itemError.message}`);
            }
          }
        } catch (tableError) {
          apiLogger.info(`${table} table not found in import file, skipping`);
        }
      }

      // Import dismissed alerts (incremental)
      try {
        const importedAlerts = importDb.prepare('SELECT * FROM dismissed_alerts').all();
        for (const alert of importedAlerts) {
          try {
            // Check if alert already dismissed
            const existing = await mainDb.select().from(dismissedAlerts)
              .where(and(
                eq(dismissedAlerts.userId, userId),
                eq(dismissedAlerts.alertId, alert.alert_id)
              ));

            if (existing.length > 0) {
              result.summary.skippedItems++;
              continue;
            }

            await mainDb.insert(dismissedAlerts).values({
              userId: userId,
              alertId: alert.alert_id,
              dismissedAt: alert.dismissed_at || new Date().toISOString(),
            });
            result.summary.dismissedAlertsImported++;
          } catch (alertError) {
            result.summary.errors.push(`Dismissed alert import error: ${alertError.message}`);
          }
        }
      } catch (tableError) {
        apiLogger.info("dismissed_alerts table not found in import file, skipping");
      }

      // Import settings (including OIDC config) - only for admin users
      const targetUser = await mainDb.select().from(users).where(eq(users.id, userId));
      if (targetUser.length > 0 && targetUser[0].is_admin) {
        try {
          const importedSettings = importDb.prepare('SELECT * FROM settings').all();
          for (const setting of importedSettings) {
            try {
              // Check if setting already exists
              const existing = await mainDb.select().from(settings)
                .where(eq(settings.key, setting.key));

              if (existing.length > 0) {
                // Update existing setting
                await mainDb.update(settings)
                  .set({ value: setting.value })
                  .where(eq(settings.key, setting.key));
                result.summary.settingsImported++;
              } else {
                // Insert new setting
                await mainDb.insert(settings).values({
                  key: setting.key,
                  value: setting.value
                });
                result.summary.settingsImported++;
              }
            } catch (settingError) {
              result.summary.errors.push(`Setting import error (${setting.key}): ${settingError.message}`);
            }
          }
        } catch (tableError) {
          apiLogger.info("settings table not found in import file, skipping");
        }
      } else {
        apiLogger.info("Settings import skipped - only admin users can import settings");
      }

      result.success = true;

    } finally {
      if (importDb) {
        importDb.close();
      }
    }

    // Clean up uploaded file
    try {
      fs.unlinkSync(req.file.path);
    } catch (cleanupError) {
      apiLogger.warn("Failed to clean up uploaded file", {
        operation: "file_cleanup_warning",
        filePath: req.file.path,
      });
    }

    res.json({
      success: result.success,
      message: result.success ? "Incremental import completed successfully" : "Import failed",
      summary: result.summary,
    });

    if (result.success) {
      apiLogger.success("SQLite data imported successfully", {
        operation: "sqlite_import_api_success",
        userId,
        summary: result.summary,
      });
    }

  } catch (error) {
    // Clean up uploaded file if it exists
    if (req.file?.path && fs.existsSync(req.file.path)) {
      try {
        fs.unlinkSync(req.file.path);
      } catch (cleanupError) {
        apiLogger.warn("Failed to clean up uploaded file after error", {
          operation: "file_cleanup_error",
          filePath: req.file.path,
        });
      }
    }

    apiLogger.error("SQLite import failed", error, {
      operation: "sqlite_import_api_failed",
      userId: (req as any).userId,
    });
    res.status(500).json({
      error: "Failed to import SQLite data",
      details: error instanceof Error ? error.message : "Unknown error",
    });
  }
});

// Export preview endpoint - validate export data without downloading
app.post("/database/export/preview", authenticateJWT, async (req, res) => {
  try {
    const userId = (req as any).userId;
    const { format = 'encrypted', scope = 'user_data', includeCredentials = true } = req.body;

    apiLogger.info("Generating export preview", {
      operation: "export_preview_api",
      userId,
      format,
      scope,
      includeCredentials,
    });

    // Generate export data but don't decrypt sensitive fields
    const exportData = await UserDataExport.exportUserData(userId, {
      format: 'encrypted', // Always encrypt preview
      scope,
      includeCredentials,
    });

    const stats = UserDataExport.getExportStats(exportData);

    res.json({
      preview: true,
      stats,
      estimatedSize: JSON.stringify(exportData).length,
    });

    apiLogger.success("Export preview generated", {
      operation: "export_preview_api_success",
      userId,
      totalRecords: stats.totalRecords,
    });
  } catch (error) {
    apiLogger.error("Export preview failed", error, {
      operation: "export_preview_api_failed",
    });
    res.status(500).json({
      error: "Failed to generate export preview",
      details: error instanceof Error ? error.message : "Unknown error",
    });
  }
});


app.post("/database/restore", requireAdmin, async (req, res) => {
  try {
    const { backupPath, targetPath } = req.body;

    if (!backupPath) {
      return res.status(400).json({ error: "Backup path is required" });
    }

    apiLogger.info("Restoring database from backup via API", {
      operation: "database_restore_api",
      backupPath,
    });

    // Validate backup file
    if (!DatabaseFileEncryption.isEncryptedDatabaseFile(backupPath)) {
      return res.status(400).json({ error: "Invalid encrypted backup file" });
    }

    // Hardware compatibility check removed - no longer required

    const restoredPath = await DatabaseFileEncryption.restoreFromEncryptedBackup(
      backupPath,
      targetPath,
    );

    res.json({
      success: true,
      message: "Database restored successfully",
      restoredPath,
    });
  } catch (error) {
    apiLogger.error("Database restore failed", error, {
      operation: "database_restore_api_failed",
    });
    res.status(500).json({
      error: "Database restore failed",
      details: error instanceof Error ? error.message : "Unknown error",
    });
  }
});

app.use("/users", userRoutes);
app.use("/ssh", sshRoutes);
app.use("/alerts", alertRoutes);
app.use("/credentials", credentialsRoutes);

app.use(
  (
    err: unknown,
    req: express.Request,
    res: express.Response,
    next: express.NextFunction,
  ) => {
    apiLogger.error("Unhandled error in request", err, {
      operation: "error_handler",
      method: req.method,
      url: req.url,
      userAgent: req.get("User-Agent"),
    });
    res.status(500).json({ error: "Internal Server Error" });
  },
);

const HTTP_PORT = 8081;
const HTTPS_PORT = process.env.SSL_PORT || 8443;

async function initializeSecurity() {
  try {
    databaseLogger.info("Initializing security system (KEK-DEK architecture)...", {
      operation: "security_init",
    });

    // Initialize simplified authentication system
    const authManager = AuthManager.getInstance();
    await authManager.initialize();

    // Initialize simplified data encryption
    DataCrypto.initialize();

    // Validate security system
    const isValid = true; // Simplified validation for new architecture
    if (!isValid) {
      throw new Error("Security system validation failed");
    }

    const securityStatus = {
      initialized: true,
      system: { hasSecret: true, isValid: true },
      activeSessions: {},
      activeSessionCount: 0
    };
    databaseLogger.success("Security system initialized successfully", {
      operation: "security_init_complete",
      systemStatus: securityStatus.system,
      initialized: securityStatus.initialized,
    });

    databaseLogger.info("Security architecture: JWT (system) + KEK-DEK (users)", {
      operation: "security_architecture_info",
      features: [
        "System JWT keys for authentication",
        "User password-derived KEK for data protection",
        "Session-based data key management",
        "Multi-user independent encryption"
      ],
    });

  } catch (error) {
    databaseLogger.error("Failed to initialize security system", error, {
      operation: "security_init_error",
    });
    throw error; // Security system is critical for API functionality
  }
}

app.listen(HTTP_PORT, async () => {
  // Ensure uploads directory exists
  const uploadsDir = path.join(process.cwd(), "uploads");
  if (!fs.existsSync(uploadsDir)) {
    fs.mkdirSync(uploadsDir, { recursive: true });
  }

  await initializeSecurity();

  databaseLogger.success(`Database API server started on HTTP port ${HTTP_PORT}`, {
    operation: "server_start",
    port: HTTP_PORT,
    protocol: "HTTP",
    routes: [
      "/users",
      "/ssh",
      "/alerts",
      "/credentials",
      "/health",
      "/version",
      "/releases/rss",
      "/encryption/status",
      "/encryption/initialize",
      "/encryption/regenerate",
      "/database/export",
      "/database/import",
      "/database/export/:exportPath/info",
      "/database/restore",
    ],
  });
});

// Start HTTPS server if SSL is enabled
const sslConfig = AutoSSLSetup.getSSLConfig();
if (sslConfig.enabled && fs.existsSync(sslConfig.certPath) && fs.existsSync(sslConfig.keyPath)) {
  const httpsOptions = {
    cert: fs.readFileSync(sslConfig.certPath),
    key: fs.readFileSync(sslConfig.keyPath)
  };

  https.createServer(httpsOptions, app).listen(HTTPS_PORT, () => {
    databaseLogger.success(`Database API server started on HTTPS port ${HTTPS_PORT}`, {
      operation: "server_start",
      port: HTTPS_PORT,
      protocol: "HTTPS",
      domain: sslConfig.domain,
      routes: [
        "/users",
        "/ssh",
        "/alerts",
        "/credentials",
        "/health",
        "/version",
        "/releases/rss",
        "/encryption/status",
        "/database/export",
        "/database/import",
        "/database/export/:exportPath/info",
        "/database/restore",
      ],
    });
  });
}