import * as plugins from '../plugins.js';
import { S3Router } from './router.js';
import { MiddlewareStack } from './middleware-stack.js';
import { S3Context } from './context.js';
import { FilesystemStore } from './filesystem-store.js';
import { S3Error } from './s3-error.js';
import { ServiceController } from '../controllers/service.controller.js';
import { BucketController } from '../controllers/bucket.controller.js';
import { ObjectController } from '../controllers/object.controller.js';

export interface ISmarts3ServerOptions {
  port?: number;
  address?: string;
  directory?: string;
  cleanSlate?: boolean;
  silent?: boolean;
}

/**
 * Custom S3-compatible server implementation
 * Built on native Node.js http module with zero framework dependencies
 */
export class Smarts3Server {
  private httpServer?: plugins.http.Server;
  private router: S3Router;
  private middlewares: MiddlewareStack;
  private store: FilesystemStore;
  private options: Required<ISmarts3ServerOptions>;

  constructor(options: ISmarts3ServerOptions = {}) {
    this.options = {
      port: 3000,
      address: '0.0.0.0',
      directory: plugins.path.join(process.cwd(), '.nogit/bucketsDir'),
      cleanSlate: false,
      silent: false,
      ...options,
    };

    this.store = new FilesystemStore(this.options.directory);
    this.router = new S3Router();
    this.middlewares = new MiddlewareStack();

    this.setupMiddlewares();
    this.setupRoutes();
  }

  /**
   * Setup middleware stack
   */
  private setupMiddlewares(): void {
    // Logger middleware
    if (!this.options.silent) {
      this.middlewares.use(async (req, res, ctx, next) => {
        const start = Date.now();
        console.log(`→ ${req.method} ${req.url}`);
        console.log(`  Headers:`, JSON.stringify(req.headers, null, 2).slice(0, 200));
        await next();
        const duration = Date.now() - start;
        console.log(`← ${req.method} ${req.url} - ${res.statusCode} (${duration}ms)`);
      });
    }

    // TODO: Add authentication middleware
    // TODO: Add CORS middleware
  }

  /**
   * Setup routes
   */
  private setupRoutes(): void {
    // Service level (/)
    this.router.get('/', ServiceController.listBuckets);

    // Bucket level (/:bucket)
    this.router.put('/:bucket', BucketController.createBucket);
    this.router.delete('/:bucket', BucketController.deleteBucket);
    this.router.get('/:bucket', BucketController.listObjects);
    this.router.head('/:bucket', BucketController.headBucket);

    // Object level (/:bucket/:key*)
    this.router.put('/:bucket/:key*', ObjectController.putObject);
    this.router.get('/:bucket/:key*', ObjectController.getObject);
    this.router.head('/:bucket/:key*', ObjectController.headObject);
    this.router.delete('/:bucket/:key*', ObjectController.deleteObject);
  }

  /**
   * Handle incoming HTTP request
   */
  private async handleRequest(
    req: plugins.http.IncomingMessage,
    res: plugins.http.ServerResponse
  ): Promise<void> {
    const context = new S3Context(req, res, this.store);

    try {
      // Execute middleware stack
      await this.middlewares.execute(req, res, context);

      // Route to handler
      const match = this.router.match(context.method, context.url.pathname);

      if (match) {
        context.params = match.params;
        await match.handler(req, res, context, match.params);
      } else {
        context.throw('NoSuchKey', 'The specified resource does not exist');
      }
    } catch (err) {
      await this.handleError(err, context, res);
    }
  }

  /**
   * Handle errors and send S3-compatible error responses
   */
  private async handleError(
    err: any,
    context: S3Context,
    res: plugins.http.ServerResponse
  ): Promise<void> {
    const s3Error = err instanceof S3Error ? err : S3Error.fromError(err);

    if (!this.options.silent) {
      console.error(`[S3Error] ${s3Error.code}: ${s3Error.message}`);
      if (s3Error.status >= 500) {
        console.error(err.stack || err);
      }
    }

    // Send error response
    const errorXml = s3Error.toXML();

    res.writeHead(s3Error.status, {
      'Content-Type': 'application/xml',
      'Content-Length': Buffer.byteLength(errorXml),
    });

    res.end(errorXml);
  }

  /**
   * Start the server
   */
  public async start(): Promise<void> {
    // Initialize store
    await this.store.initialize();

    // Clean slate if requested
    if (this.options.cleanSlate) {
      await this.store.reset();
    }

    // Create HTTP server
    this.httpServer = plugins.http.createServer((req, res) => {
      this.handleRequest(req, res).catch((err) => {
        console.error('Fatal error in request handler:', err);
        if (!res.headersSent) {
          res.writeHead(500, { 'Content-Type': 'text/plain' });
          res.end('Internal Server Error');
        }
      });
    });

    // Start listening
    await new Promise<void>((resolve, reject) => {
      this.httpServer!.listen(this.options.port, this.options.address, (err?: Error) => {
        if (err) {
          reject(err);
        } else {
          if (!this.options.silent) {
            console.log(`S3 server listening on ${this.options.address}:${this.options.port}`);
          }
          resolve();
        }
      });
    });
  }

  /**
   * Stop the server
   */
  public async stop(): Promise<void> {
    if (!this.httpServer) {
      return;
    }

    await new Promise<void>((resolve, reject) => {
      this.httpServer!.close((err?: Error) => {
        if (err) {
          reject(err);
        } else {
          if (!this.options.silent) {
            console.log('S3 server stopped');
          }
          resolve();
        }
      });
    });

    this.httpServer = undefined;
  }

  /**
   * Get server port (useful for testing with random ports)
   */
  public getPort(): number {
    if (!this.httpServer) {
      throw new Error('Server not started');
    }

    const address = this.httpServer.address();
    if (typeof address === 'string') {
      throw new Error('Unix socket not supported');
    }

    return address?.port || this.options.port;
  }

  /**
   * Get S3 descriptor for client configuration
   */
  public getS3Descriptor(): {
    accessKey: string;
    accessSecret: string;
    endpoint: string;
    port: number;
    useSsl: boolean;
  } {
    return {
      accessKey: 'S3RVER',
      accessSecret: 'S3RVER',
      endpoint: this.options.address === '0.0.0.0' ? '127.0.0.1' : this.options.address,
      port: this.getPort(),
      useSsl: false,
    };
  }
}