import { Credentials, S3 } from 'aws-sdk';
import fs from 'fs';
import path from 'path';
import klawSync from 'klaw-sync';
import klaw, { Item } from 'klaw';
import mime from 'mime-types';
import UploadStream from 's3-stream-upload';
import { isEmpty } from 'ramda';
import { createReadStream } from 'fs-extra';
import archiver from 'archiver';
import { utils } from '@serverless/core';

import {} from '../../types';

export const getClients = (
  credentials: Credentials,
  region: string
): {
  regular: S3;
  accelerated: S3;
} => {
  const params = {
    region,
    credentials,
  };

  // we need two S3 clients because creating/deleting buckets
  // is not available with the acceleration feature.
  return {
    regular: new S3(params),
    accelerated: new S3({ ...params, endpoint: `s3-accelerate.amazonaws.com` }),
  };
};

const bucketCreation = async (s3: S3, Bucket: S3.BucketName): Promise<any> => {
  try {
    await s3.headBucket({ Bucket }).promise();
  } catch (e) {
    if (e.code === 'NotFound' || e.code === 'NoSuchBucket') {
      await utils.sleep(2000);
      return bucketCreation(s3, Bucket);
    }
    throw new Error(e);
  }
};

export const ensureBucket = async (
  s3: S3,
  name: string,
  debug: (message: string) => void
): Promise<any> => {
  try {
    debug(`Checking if bucket ${name} exists.`);
    await s3.headBucket({ Bucket: name }).promise();
  } catch (e) {
    if (e.code === 'NotFound') {
      debug(`Bucket ${name} does not exist. Creating...`);
      await s3.createBucket({ Bucket: name }).promise();
      // there's a race condition when using acceleration
      // so we need to sleep for a couple seconds. See this issue:
      // https://github.com/serverless/components/issues/428
      debug(`Bucket ${name} created. Confirming it's ready...`);
      await bucketCreation(s3, name);
      debug(`Bucket ${name} creation confirmed.`);
    } else if (e.code === 'Forbidden' && e.message === null) {
      throw Error(`Forbidden: Invalid credentials or this AWS S3 bucket name may already be taken`);
    } else if (e.code === 'Forbidden') {
      throw Error(`Bucket name "${name}" is already taken.`);
    } else {
      throw e;
    }
  }
};

export const uploadDir = async (
  s3: S3,
  bucketName: string,
  dirPath: string,
  cacheControl?: S3.CacheControl,
  options?: { keyPrefix?: string }
): Promise<void> => {
  const items: ReadonlyArray<klawSync.Item> = await new Promise((resolve, reject) => {
    try {
      resolve(klawSync(dirPath));
    } catch (error) {
      reject(error);
    }
  });

  const uploadItems: Promise<S3.ManagedUpload.SendData>[] = [];
  items.forEach((item) => {
    if (item.stats.isDirectory()) {
      return;
    }

    let key = path.relative(dirPath, item.path);

    if (options?.keyPrefix) {
      key = path.posix.join(options.keyPrefix, key);
    }

    // convert backslashes to forward slashes on windows
    if (path.sep === '\\') {
      key = key.replace(/\\/g, '/');
    }

    const itemParams = {
      Bucket: bucketName,
      Key: key,
      Body: fs.readFileSync(item.path),
      ContentType: mime.lookup(path.basename(item.path)) || 'application/octet-stream',
      CacheControl: cacheControl,
    };

    uploadItems.push(s3.upload(itemParams).promise());
  });

  await Promise.all(uploadItems);
};

export const packAndUploadDir = async ({
  s3,
  bucketName,
  dirPath,
  key,
  append = [],
  cacheControl,
}: {
  s3: S3;
  bucketName: string;
  dirPath: string;
  key: string;
  append?: string[];
  cacheControl?: S3.CacheControl;
}): Promise<void> => {
  const ignore = (await utils.readFileIfExists(path.join(dirPath, '.slsignore'))) || [];
  return new Promise((resolve, reject) => {
    const archive = archiver('zip', {
      zlib: { level: 9 },
    });

    if (!isEmpty(append)) {
      append.forEach((file) => {
        const fileStream = createReadStream(file);
        archive.append(fileStream, { name: path.basename(file) });
      });
    }

    archive.glob(
      '**/*',
      {
        cwd: dirPath,
        ignore,
      },
      {}
    );

    archive
      .pipe(
        UploadStream(s3, {
          Bucket: bucketName,
          Key: key,
          CacheControl: cacheControl,
        })
      )
      .on('error', (err: Error) => reject(err))
      .on('finish', () => resolve());

    archive.finalize();
  });
};

export const uploadFile = async ({
  s3,
  bucketName,
  filePath,
  key,
  cacheControl,
}: {
  s3: S3;
  bucketName: string;
  filePath: string;
  key: string;
  cacheControl?: S3.CacheControl;
}): Promise<void> => {
  return new Promise((resolve, reject) => {
    fs.createReadStream(filePath)
      .pipe(
        UploadStream(s3, {
          Bucket: bucketName,
          Key: key,
          ContentType: mime.lookup(filePath) || 'application/octet-stream',
          CacheControl: cacheControl,
        })
      )
      .on('error', (err: Error) => reject(err))
      .on('finish', () => resolve());
  });
};

/*
 * Delete Website Bucket
 */
export const clearBucket = async (s3: S3, bucketName: string): Promise<any> => {
  try {
    const data = await s3.listObjects({ Bucket: bucketName }).promise();

    const items = data.Contents || [];
    const promises = [];

    for (let i = 0; i < items.length; i += 1) {
      const deleteParams = { Bucket: bucketName, Key: items[i].Key as string };
      const delObj = s3.deleteObject(deleteParams).promise();
      promises.push(delObj);
    }

    await Promise.all(promises);
  } catch (error) {
    if (error.code !== 'NoSuchBucket') {
      throw error;
    }
  }
};

export const accelerateBucket = async (
  s3: S3,
  bucketName: string,
  accelerated: boolean
): Promise<any> => {
  try {
    await s3
      .putBucketAccelerateConfiguration({
        AccelerateConfiguration: {
          Status: accelerated ? 'Enabled' : 'Suspended',
        },
        Bucket: bucketName,
      })
      .promise();
  } catch (e) {
    if (e.code === 'NoSuchBucket') {
      await utils.sleep(2000);
      return accelerateBucket(s3, bucketName, accelerated);
    }
    throw e;
  }
};

export const deleteBucket = async (s3: S3, bucketName: string): Promise<any> => {
  try {
    await s3.deleteBucket({ Bucket: bucketName }).promise();
  } catch (error) {
    if (error.code !== 'NoSuchBucket') {
      throw error;
    }
  }
};

export const configureCors = async (
  s3: S3,
  bucketName: string,
  config: S3.CORSConfiguration
): Promise<any> => {
  const params = { Bucket: bucketName, CORSConfiguration: config };
  try {
    await s3.putBucketCors(params).promise();
  } catch (e) {
    if (e.code === 'NoSuchBucket') {
      await utils.sleep(2000);
      return configureCors(s3, bucketName, config);
    }
    throw e;
  }
};

export const pathToPosix = (path: string): string => path.replace(/\\/g, '/');

export const readDirectoryFiles = (directory: string): Promise<Array<Item>> => {
  const items: Item[] = [];
  return new Promise((resolve, reject) => {
    klaw(directory.trim())
      .on('data', (item) => items.push(item))
      .on('end', () => {
        resolve(items);
      })
      .on('error', reject);
  });
};

export const filterOutDirectories = (fileItem: Item): boolean => !fileItem.stats.isDirectory();

export const getMimeType = (filePath: string): string =>
  mime.lookup(path.basename(filePath)) || 'application/octet-stream';