import * as plugins from '../plugins.js';
import type { S3Context } from '../classes/context.js';

/**
 * Object-level operations
 */
export class ObjectController {
  /**
   * PUT /:bucket/:key* - Upload object, copy object, or upload part
   */
  public static async putObject(
    req: plugins.http.IncomingMessage,
    res: plugins.http.ServerResponse,
    ctx: S3Context,
    params: Record<string, string>
  ): Promise<void> {
    const { bucket, key } = params;

    // Check if this is a multipart upload part
    if (ctx.query.partNumber && ctx.query.uploadId) {
      return ObjectController.uploadPart(req, res, ctx, params);
    }

    // Check if this is a COPY operation
    const copySource = ctx.headers['x-amz-copy-source'] as string | undefined;
    if (copySource) {
      return ObjectController.copyObject(req, res, ctx, params);
    }

    // Extract metadata from headers
    const metadata: Record<string, string> = {};
    for (const [header, value] of Object.entries(ctx.headers)) {
      if (header.startsWith('x-amz-meta-')) {
        metadata[header] = value as string;
      }
      if (header === 'content-type' && value) {
        metadata['content-type'] = value as string;
      }
      if (header === 'cache-control' && value) {
        metadata['cache-control'] = value as string;
      }
    }

    // If no content-type, default to binary/octet-stream
    if (!metadata['content-type']) {
      metadata['content-type'] = 'binary/octet-stream';
    }

    // Stream upload
    const result = await ctx.store.putObject(bucket, key, ctx.getRequestStream(), metadata);

    ctx.setHeader('ETag', `"${result.md5}"`);
    ctx.status(200).send('');
  }

  /**
   * GET /:bucket/:key* - Download object
   */
  public static async getObject(
    req: plugins.http.IncomingMessage,
    res: plugins.http.ServerResponse,
    ctx: S3Context,
    params: Record<string, string>
  ): Promise<void> {
    const { bucket, key } = params;

    // Parse Range header if present
    const rangeHeader = ctx.headers.range as string | undefined;
    let range: { start: number; end: number } | undefined;

    if (rangeHeader) {
      const matches = rangeHeader.match(/bytes=(\d+)-(\d*)/);
      if (matches) {
        const start = parseInt(matches[1]);
        const end = matches[2] ? parseInt(matches[2]) : undefined;
        range = { start, end: end || start + 1024 * 1024 }; // Default to 1MB if no end
      }
    }

    // Get object
    const object = await ctx.store.getObject(bucket, key, range);

    // Set response headers
    ctx.setHeader('ETag', `"${object.md5}"`);
    ctx.setHeader('Last-Modified', object.lastModified.toUTCString());
    ctx.setHeader('Content-Type', object.metadata['content-type'] || 'binary/octet-stream');
    ctx.setHeader('Accept-Ranges', 'bytes');

    // Handle custom metadata headers
    for (const [key, value] of Object.entries(object.metadata)) {
      if (key.startsWith('x-amz-meta-')) {
        ctx.setHeader(key, value);
      }
    }

    if (range) {
      ctx.status(206);
      ctx.setHeader('Content-Length', (range.end - range.start + 1).toString());
      ctx.setHeader('Content-Range', `bytes ${range.start}-${range.end}/${object.size}`);
    } else {
      ctx.status(200);
      ctx.setHeader('Content-Length', object.size.toString());
    }

    // Stream response
    await ctx.send(object.content!);
  }

  /**
   * HEAD /:bucket/:key* - Get object metadata
   */
  public static async headObject(
    req: plugins.http.IncomingMessage,
    res: plugins.http.ServerResponse,
    ctx: S3Context,
    params: Record<string, string>
  ): Promise<void> {
    const { bucket, key } = params;

    // Get object (without content)
    const object = await ctx.store.getObject(bucket, key);

    // Set response headers (same as GET but no body)
    ctx.setHeader('ETag', `"${object.md5}"`);
    ctx.setHeader('Last-Modified', object.lastModified.toUTCString());
    ctx.setHeader('Content-Type', object.metadata['content-type'] || 'binary/octet-stream');
    ctx.setHeader('Content-Length', object.size.toString());
    ctx.setHeader('Accept-Ranges', 'bytes');

    // Handle custom metadata headers
    for (const [key, value] of Object.entries(object.metadata)) {
      if (key.startsWith('x-amz-meta-')) {
        ctx.setHeader(key, value);
      }
    }

    ctx.status(200).send('');
  }

  /**
   * DELETE /:bucket/:key* - Delete object or abort multipart upload
   */
  public static async deleteObject(
    req: plugins.http.IncomingMessage,
    res: plugins.http.ServerResponse,
    ctx: S3Context,
    params: Record<string, string>
  ): Promise<void> {
    const { bucket, key } = params;

    // Check if this is an abort multipart upload
    if (ctx.query.uploadId) {
      return ObjectController.abortMultipartUpload(req, res, ctx, params);
    }

    await ctx.store.deleteObject(bucket, key);
    ctx.status(204).send('');
  }

  /**
   * COPY operation (PUT with x-amz-copy-source header)
   */
  private static async copyObject(
    req: plugins.http.IncomingMessage,
    res: plugins.http.ServerResponse,
    ctx: S3Context,
    params: Record<string, string>
  ): Promise<void> {
    const { bucket: destBucket, key: destKey } = params;
    const copySource = ctx.headers['x-amz-copy-source'] as string;

    // Parse source bucket and key from copy source
    // Format: /bucket/key or bucket/key
    const sourcePath = copySource.startsWith('/') ? copySource.slice(1) : copySource;
    const firstSlash = sourcePath.indexOf('/');
    const srcBucket = decodeURIComponent(sourcePath.slice(0, firstSlash));
    const srcKey = decodeURIComponent(sourcePath.slice(firstSlash + 1));

    // Get metadata directive (COPY or REPLACE)
    const metadataDirective = (ctx.headers['x-amz-metadata-directive'] as string)?.toUpperCase() || 'COPY';

    // Extract new metadata if REPLACE
    let newMetadata: Record<string, string> | undefined;
    if (metadataDirective === 'REPLACE') {
      newMetadata = {};
      for (const [header, value] of Object.entries(ctx.headers)) {
        if (header.startsWith('x-amz-meta-')) {
          newMetadata[header] = value as string;
        }
        if (header === 'content-type' && value) {
          newMetadata['content-type'] = value as string;
        }
      }
    }

    // Perform copy
    const result = await ctx.store.copyObject(
      srcBucket,
      srcKey,
      destBucket,
      destKey,
      metadataDirective as 'COPY' | 'REPLACE',
      newMetadata
    );

    // Send XML response
    await ctx.sendXML({
      CopyObjectResult: {
        LastModified: new Date().toISOString(),
        ETag: `"${result.md5}"`,
      },
    });
  }

  /**
   * POST /:bucket/:key* - Initiate or complete multipart upload
   */
  public static async postObject(
    req: plugins.http.IncomingMessage,
    res: plugins.http.ServerResponse,
    ctx: S3Context,
    params: Record<string, string>
  ): Promise<void> {
    // Check if this is initiate multipart upload
    if (ctx.query.uploads !== undefined) {
      return ObjectController.initiateMultipartUpload(req, res, ctx, params);
    }

    // Check if this is complete multipart upload
    if (ctx.query.uploadId) {
      return ObjectController.completeMultipartUpload(req, res, ctx, params);
    }

    ctx.throw('InvalidRequest', 'Invalid POST request');
  }

  /**
   * Initiate Multipart Upload (POST with ?uploads)
   */
  private static async initiateMultipartUpload(
    req: plugins.http.IncomingMessage,
    res: plugins.http.ServerResponse,
    ctx: S3Context,
    params: Record<string, string>
  ): Promise<void> {
    const { bucket, key } = params;

    // Extract metadata from headers
    const metadata: Record<string, string> = {};
    for (const [header, value] of Object.entries(ctx.headers)) {
      if (header.startsWith('x-amz-meta-')) {
        metadata[header] = value as string;
      }
      if (header === 'content-type' && value) {
        metadata['content-type'] = value as string;
      }
    }

    // Initiate upload
    const uploadId = await ctx.multipart.initiateUpload(bucket, key, metadata);

    // Send XML response
    await ctx.sendXML({
      InitiateMultipartUploadResult: {
        Bucket: bucket,
        Key: key,
        UploadId: uploadId,
      },
    });
  }

  /**
   * Upload Part (PUT with ?partNumber&uploadId)
   */
  private static async uploadPart(
    req: plugins.http.IncomingMessage,
    res: plugins.http.ServerResponse,
    ctx: S3Context,
    params: Record<string, string>
  ): Promise<void> {
    const uploadId = ctx.query.uploadId!;
    const partNumber = parseInt(ctx.query.partNumber!);

    if (isNaN(partNumber) || partNumber < 1 || partNumber > 10000) {
      ctx.throw('InvalidPartNumber', 'Part number must be between 1 and 10000');
    }

    // Upload the part
    const partInfo = await ctx.multipart.uploadPart(
      uploadId,
      partNumber,
      ctx.getRequestStream() as any as import('stream').Readable
    );

    // Set ETag header (part ETag)
    ctx.setHeader('ETag', `"${partInfo.etag}"`);
    ctx.status(200).send('');
  }

  /**
   * Complete Multipart Upload (POST with ?uploadId)
   */
  private static async completeMultipartUpload(
    req: plugins.http.IncomingMessage,
    res: plugins.http.ServerResponse,
    ctx: S3Context,
    params: Record<string, string>
  ): Promise<void> {
    const { bucket, key } = params;
    const uploadId = ctx.query.uploadId!;

    // Read and parse request body (XML with part list)
    const body = await ctx.readBody();

    // Parse XML to extract parts
    // Expected format: <CompleteMultipartUpload><Part><PartNumber>1</PartNumber><ETag>"etag"</ETag></Part>...</CompleteMultipartUpload>
    const partMatches = body.matchAll(/<Part>.*?<PartNumber>(\d+)<\/PartNumber>.*?<ETag>(.*?)<\/ETag>.*?<\/Part>/gs);
    const parts: Array<{ PartNumber: number; ETag: string }> = [];

    for (const match of partMatches) {
      parts.push({
        PartNumber: parseInt(match[1]),
        ETag: match[2],
      });
    }

    // Complete the upload
    const result = await ctx.multipart.completeUpload(uploadId, parts);

    // Get upload metadata
    const upload = ctx.multipart.getUpload(uploadId);
    if (!upload) {
      ctx.throw('NoSuchUpload', 'The specified upload does not exist');
    }

    // Move final file to object store
    const finalPath = ctx.multipart.getFinalPath(uploadId);
    const finalContent = await plugins.smartfs.file(finalPath).read();
    const finalStream = plugins.http.IncomingMessage.prototype;

    // Create a readable stream from the buffer
    const { Readable } = await import('stream');
    const finalReadableStream = Readable.from([finalContent]);

    // Store the final object
    await ctx.store.putObject(bucket, key, finalReadableStream, upload.metadata);

    // Clean up multipart upload data
    await ctx.multipart.cleanupUpload(uploadId);

    // Send XML response
    await ctx.sendXML({
      CompleteMultipartUploadResult: {
        Location: `/${bucket}/${key}`,
        Bucket: bucket,
        Key: key,
        ETag: `"${result.etag}"`,
      },
    });
  }

  /**
   * Abort Multipart Upload (DELETE with ?uploadId)
   */
  private static async abortMultipartUpload(
    req: plugins.http.IncomingMessage,
    res: plugins.http.ServerResponse,
    ctx: S3Context,
    params: Record<string, string>
  ): Promise<void> {
    const uploadId = ctx.query.uploadId!;

    // Abort and cleanup
    await ctx.multipart.abortUpload(uploadId);

    ctx.status(204).send('');
  }
}