import * as plugins from './plugins.js';
import * as helpers from './helpers.js';
import * as interfaces from './interfaces.js';
import { SmartBucket } from './classes.smartbucket.js';
import { Directory } from './classes.directory.js';
import { File } from './classes.file.js';

export class Bucket {
  public static async getBucketByName(smartbucketRef: SmartBucket, bucketNameArg: string) {
    const buckets = await smartbucketRef.minioClient.listBuckets();
    const foundBucket = buckets.find((bucket) => {
      return bucket.name === bucketNameArg;
    });

    if (foundBucket) {
      console.log(`bucket with name ${bucketNameArg} exists.`);
      console.log(`Taking this as base for new Bucket instance`);
      return new this(smartbucketRef, bucketNameArg);
    } else {
      return null;
    }
  }

  public static async createBucketByName(smartbucketRef: SmartBucket, bucketName: string) {
    await smartbucketRef.minioClient.makeBucket(bucketName, 'ams3').catch((e) => console.log(e));
    return new Bucket(smartbucketRef, bucketName);
  }

  public static async removeBucketByName(smartbucketRef: SmartBucket, bucketName: string) {
    await smartbucketRef.minioClient.removeBucket(bucketName).catch((e) => console.log(e));
  }

  public smartbucketRef: SmartBucket;
  public name: string;

  constructor(smartbucketRef: SmartBucket, bucketName: string) {
    this.smartbucketRef = smartbucketRef;
    this.name = bucketName;
  }

  /**
   * gets the base directory of the bucket
   */
  public async getBaseDirectory(): Promise<Directory> {
    return new Directory(this, null, '');
  }

  public async getDirectoryFromPath(pathDescriptorArg: interfaces.IPathDecriptor): Promise<Directory> {
    if (!pathDescriptorArg.path && !pathDescriptorArg.directory) {
      return this.getBaseDirectory();
    }
    let checkPath = await helpers.reducePathDescriptorToPath(pathDescriptorArg);
    const baseDirectory = await this.getBaseDirectory();
    return await baseDirectory.getSubDirectoryByName(checkPath);
  }

  // ===============
  // Fast Operations
  // ===============

  /**
   * store file
   */
  public async fastPut(optionsArg: {
    path: string;
    contents: string | Buffer;
    overwrite?: boolean;
  }): Promise<File> {
    try {
      const reducedPath = await helpers.reducePathDescriptorToPath({
        path: optionsArg.path,
      })
      // Check if the object already exists
      const exists = await this.fastExists({ path: reducedPath });
  
      if (exists && !optionsArg.overwrite) {
        console.error(`Object already exists at path '${reducedPath}' in bucket '${this.name}'.`);
        return;
      } else if (exists && optionsArg.overwrite) {
        console.log(`Overwriting existing object at path '${reducedPath}' in bucket '${this.name}'.`);
      } else {
        console.log(`Creating new object at path '${reducedPath}' in bucket '${this.name}'.`);
      }
  
      // Proceed with putting the object
      const streamIntake = new plugins.smartstream.StreamIntake();
      const putPromise = this.smartbucketRef.minioClient.putObject(this.name, reducedPath, streamIntake);
      streamIntake.pushData(optionsArg.contents);
      streamIntake.signalEnd();
      await putPromise;
  
      console.log(`Object '${reducedPath}' has been successfully stored in bucket '${this.name}'.`);
      const parsedPath = plugins.path.parse(reducedPath);
      return new File({
        directoryRefArg: await this.getDirectoryFromPath({
          path: parsedPath.dir,
        }),
        fileName: parsedPath.base,
      });
    } catch (error) {
      console.error(`Error storing object at path '${optionsArg.path}' in bucket '${this.name}':`, error);
      throw error;
    }
  }
  

  /**
   * get file
   */
  public async fastGet(optionsArg: {
    path: string
  }): Promise<Buffer> {
    const done = plugins.smartpromise.defer();
    let completeFile: Buffer;
    const replaySubject = await this.fastGetReplaySubject(optionsArg);
    const subscription = replaySubject.subscribe({
      next: (chunk) => {
        if (completeFile) {
          completeFile = Buffer.concat([completeFile, chunk]);
        } else {
          completeFile = chunk;
        }
      },
      complete: () => {
        done.resolve();
        subscription.unsubscribe();
      },
      error: (err) => {
        console.log(err);
      },
    });
    await done.promise;
    return completeFile;
  }

  /**
   * good when time to first byte is important
   * and multiple subscribers are expected
   * @param optionsArg
   * @returns 
   */
  public async fastGetReplaySubject(optionsArg: {
    path: string;
  }): Promise<plugins.smartrx.rxjs.ReplaySubject<Buffer>> {
    const fileStream = await this.smartbucketRef.minioClient
      .getObject(this.name, optionsArg.path)
      .catch((e) => console.log(e));
    const replaySubject = new plugins.smartrx.rxjs.ReplaySubject<Buffer>();
    const duplexStream = new plugins.smartstream.SmartDuplex<Buffer, void>({
      writeFunction: async (chunk) => {
        replaySubject.next(chunk);
        return;
      },
      finalFunction: async (cb) => {
        replaySubject.complete();
        return;
      }
    });

    if (!fileStream) {
      return null;
    }

    const smartstream = new plugins.smartstream.StreamWrapper([
      fileStream,
      duplexStream,
    ]);
    smartstream.run();
    return replaySubject;
  }

  public fastGetStream(optionsArg: {
    path: string;
  }, typeArg: 'webstream'): Promise<ReadableStream>
  public async fastGetStream(optionsArg: {
    path: string;
  }, typeArg: 'nodestream'): Promise<plugins.stream.Readable>

  /**
   * fastGetStream
   * @param optionsArg
   * @returns 
   */
  public async fastGetStream(optionsArg: { path: string; }, typeArg: 'webstream' | 'nodestream' = 'nodestream'): Promise<ReadableStream | plugins.stream.Readable>{
    const fileStream = await this.smartbucketRef.minioClient
      .getObject(this.name, optionsArg.path)
      .catch((e) => console.log(e));
    const duplexStream = new plugins.smartstream.SmartDuplex<Buffer, Buffer>({
      writeFunction: async (chunk) => {
        return chunk;
      },
      finalFunction: async (cb) => {
        return null;
      }
    });

    if (!fileStream) {
      return null;
    }

    const smartstream = new plugins.smartstream.StreamWrapper([
      fileStream,
      duplexStream,
    ]);
    smartstream.run();
    if (typeArg === 'nodestream') {
      return duplexStream;
    };
    if (typeArg === 'webstream') {
      return (await duplexStream.getWebStreams()).readable;
    }
  }

  /**
   * store file as stream
   */
  public async fastPutStream(optionsArg: {
    path: string;
    readableStream: plugins.stream.Readable | ReadableStream;
    nativeMetadata?: { [key: string]: string };
    overwrite?: boolean;
  }): Promise<void> {
    try {
      // Check if the object already exists
      const exists = await this.fastExists({ path: optionsArg.path });
  
      if (exists && !optionsArg.overwrite) {
        console.error(`Object already exists at path '${optionsArg.path}' in bucket '${this.name}'.`);
        return;
      } else if (exists && optionsArg.overwrite) {
        console.log(`Overwriting existing object at path '${optionsArg.path}' in bucket '${this.name}'.`);
      } else {
        console.log(`Creating new object at path '${optionsArg.path}' in bucket '${this.name}'.`);
      }

      const streamIntake = await plugins.smartstream.StreamIntake.fromStream<Uint8Array>(optionsArg.readableStream);
  
      // Proceed with putting the object
      await this.smartbucketRef.minioClient.putObject(
        this.name,
        optionsArg.path,
        streamIntake,
        null,
        ...(optionsArg.nativeMetadata
          ? (() => {
              const returnObject: any = {};
              return returnObject;
            })()
          : {})
      );
  
      console.log(`Object '${optionsArg.path}' has been successfully stored in bucket '${this.name}'.`);
    } catch (error) {
      console.error(`Error storing object at path '${optionsArg.path}' in bucket '${this.name}':`, error);
      throw error;
    }
  }
  

  public async fastCopy(optionsArg: {
    sourcePath: string;
    destinationPath?: string;
    targetBucket?: Bucket;
    nativeMetadata?: { [key: string]: string };
    deleteExistingNativeMetadata?: boolean;
  }): Promise<void> {
    try {
      const targetBucketName = optionsArg.targetBucket ? optionsArg.targetBucket.name : this.name;

      // Retrieve current object information to use in copy conditions
      const currentObjInfo = await this.smartbucketRef.minioClient.statObject(
        targetBucketName,
        optionsArg.sourcePath
      );

      // Setting up copy conditions
      const copyConditions = new plugins.minio.CopyConditions();

      // Prepare new metadata
      const newNativeMetadata = {
        ...(optionsArg.deleteExistingNativeMetadata ? {} : currentObjInfo.metaData),
        ...optionsArg.nativeMetadata,
      };

      // Define the copy operation as a Promise
      // TODO: check on issue here: https://github.com/minio/minio-js/issues/1286
      await this.smartbucketRef.minioClient.copyObject(
        this.name,
        optionsArg.sourcePath,
        `/${targetBucketName}/${optionsArg.destinationPath || optionsArg.sourcePath}`,
        copyConditions
      );
    } catch (err) {
      console.error('Error updating metadata:', err);
      throw err; // rethrow to allow caller to handle
    }
  }

    /**
   * Move object from one path to another within the same bucket or to another bucket
   */
    public async fastMove(optionsArg: {
      sourcePath: string;
      destinationPath: string;
      targetBucket?: Bucket;
      overwrite?: boolean;
    }): Promise<void> {
      try {
        // Check if the destination object already exists
        const destinationBucket = optionsArg.targetBucket || this;
        const exists = await destinationBucket.fastExists({ path: optionsArg.destinationPath });
  
        if (exists && !optionsArg.overwrite) {
          console.error(`Object already exists at destination path '${optionsArg.destinationPath}' in bucket '${destinationBucket.name}'.`);
          return;
        } else if (exists && optionsArg.overwrite) {
          console.log(`Overwriting existing object at destination path '${optionsArg.destinationPath}' in bucket '${destinationBucket.name}'.`);
        } else {
          console.log(`Moving object to path '${optionsArg.destinationPath}' in bucket '${destinationBucket.name}'.`);
        }
  
        // Proceed with copying the object to the new path
        await this.fastCopy(optionsArg);
  
        // Remove the original object after successful copy
        await this.fastRemove({ path: optionsArg.sourcePath });
  
        console.log(`Object '${optionsArg.sourcePath}' has been successfully moved to '${optionsArg.destinationPath}' in bucket '${destinationBucket.name}'.`);
      } catch (error) {
        console.error(`Error moving object from '${optionsArg.sourcePath}' to '${optionsArg.destinationPath}':`, error);
        throw error;
      }
    }
  

  /**
   * removeObject
   */
  public async fastRemove(optionsArg: {
    path: string;
  }) {
    await this.smartbucketRef.minioClient.removeObject(this.name, optionsArg.path);
  }

  /**
   * check wether file exists
   * @param optionsArg
   * @returns 
   */
  public async fastExists(optionsArg: {
    path: string;
  }): Promise<boolean> {
    try {
      await this.smartbucketRef.minioClient.statObject(this.name, optionsArg.path);
      console.log(`Object '${optionsArg.path}' exists in bucket '${this.name}'.`);
      return true;
    } catch (error) {
      if (error.code === 'NotFound') {
        console.log(`Object '${optionsArg.path}' does not exist in bucket '${this.name}'.`);
        return false;
      } else {
        console.error('Error checking object existence:', error);
        throw error; // Rethrow if it's not a NotFound error to handle unexpected issues
      }
    }
  }

  /**
   * deletes this bucket
   */
  public async delete() {
    await this.smartbucketRef.minioClient.removeBucket(this.name);
  }

  public async fastStat(pathDescriptor: interfaces.IPathDecriptor) {
    let checkPath = await helpers.reducePathDescriptorToPath(pathDescriptor);
    return this.smartbucketRef.minioClient.statObject(this.name, checkPath);
  }

  public async isDirectory(pathDescriptor: interfaces.IPathDecriptor): Promise<boolean> {
    let checkPath = await helpers.reducePathDescriptorToPath(pathDescriptor);
    
    // lets check if the checkPath is a directory
    const stream = this.smartbucketRef.minioClient.listObjectsV2(this.name, checkPath, true);
    const done = plugins.smartpromise.defer<boolean>();
    stream.on('data', (dataArg) => {
      stream.destroy(); // Stop the stream early if we find at least one object
      if (dataArg.prefix.startsWith(checkPath + '/')) {
        done.resolve(true);
      }
    });
    
    stream.on('end', () => {
      done.resolve(false);
    });
    
    stream.on('error', (err) => {
      done.reject(err);
    });

    return done.promise;
  };

  public async isFile(pathDescriptor: interfaces.IPathDecriptor): Promise<boolean> {
    let checkPath = await helpers.reducePathDescriptorToPath(pathDescriptor);
    
    // lets check if the checkPath is a directory
    const stream = this.smartbucketRef.minioClient.listObjectsV2(this.name, checkPath, true);
    const done = plugins.smartpromise.defer<boolean>();
    stream.on('data', (dataArg) => {
      stream.destroy(); // Stop the stream early if we find at least one object
      if (dataArg.prefix === checkPath) {
        done.resolve(true);
      }
    });
    
    stream.on('end', () => {
      done.resolve(false);
    });
    
    stream.on('error', (err) => {
      done.reject(err);
    });

    return done.promise;
  }
}