// Copyright IBM Corp. 2013,2019. All Rights Reserved.
// Node module: loopback-component-storage
// This file is licensed under the Artistic License 2.0.
// License text available at https://opensource.org/licenses/Artistic-2.0

'use strict';

var FileSystemProvider = require('../lib/providers/filesystem/index.js').Client;

var assert = require('assert');
var path = require('path');

function verifyMetadata(fileOrContainer, name) {
  assert(fileOrContainer.getMetadata());
  assert.equal(fileOrContainer.getMetadata().name, name);
  assert(fileOrContainer.getMetadata().uid === undefined);
  assert(fileOrContainer.getMetadata().gid === undefined);
  assert(fileOrContainer.getMetadata().atime);
  assert(fileOrContainer.getMetadata().ctime);
  assert(fileOrContainer.getMetadata().mtime);
  assert.equal(typeof fileOrContainer.getMetadata().size, 'number');
}

describe('FileSystem based storage provider', function() {
  describe('container apis', function() {
    var client = null;
    it('should require an existing directory as the root', function(done) {
      client = new FileSystemProvider({
        root: path.join(__dirname, 'storage'),
      });
      process.nextTick(done);
    });

    it('should work even it is ran from other path', function(done) {
      process.chdir('../../../');

      try {
        console.log(`running from ${process.cwd()}`);
        client = new FileSystemProvider({
          root: path.join(__dirname, 'storage'),
        });

        process.nextTick(done);
      } catch (error) {
        process.nextTick(done(error));
      }
    });

    it('should complain if the root directory doesn\'t exist', function(done) {
      try {
        client = new FileSystemProvider({
          root: path.join(__dirname, '_storage'),
        });
        process.nextTick(done.bind(null, 'Error'));
      } catch (err) {
        // Should be here
        process.nextTick(done);
      }
    });

    it('should return an empty list of containers', function(done) {
      client.getContainers(function(err, containers) {
        assert(!err);
        assert.equal(containers.length, 0);
        done(err, containers);
      });
    });

    it('should return an empty list of containers - promise', function(done) {
      client.getContainers()
        .then(function(containers) {
          assert.equal(containers.length, 0);
          done();
        })
        .catch(done);
    });

    it('should create a new container', function(done) {
      client.createContainer({name: 'c1'}, function(err, container) {
        assert(!err);
        verifyMetadata(container, 'c1');
        done(err, container);
      });
    });

    it('should create a new container - promise', function(done) {
      client.createContainer({name: 'c3'})
        .then(function(container) {
          verifyMetadata(container, 'c3');
          done();
        })
        .catch(done);
    });

    it('should get a container c1', function(done) {
      client.getContainer('c1', function(err, container) {
        assert(!err);
        verifyMetadata(container, 'c1');
        done(err, container);
      });
    });

    it('should get a container c1 - promise', function(done) {
      client.getContainer('c1')
        .then(function(container) {
          verifyMetadata(container, 'c1');
          done();
        })
        .catch(done);
    });

    it('should not get a container c2', function(done) {
      client.getContainer('c2', function(err, container) {
        assert(err);
        done(null, container);
      });
    });

    it('should destroy a container c3 - promise', function(done) {
      client.destroyContainer('c3')
        .then(function(container) {
          done(null, container);
        })
        .catch(done);
    });

    it('should return one container', function(done) {
      client.getContainers(function(err, containers) {
        assert(!err);
        assert.equal(containers.length, 1);
        done(err, containers);
      });
    });

    it('should destroy a container c1', function(done) {
      client.destroyContainer('c1', function(err, container) {
        assert(!err);
        done(err, container);
      });
    });

    it('should not get a container c1 after destroy', function(done) {
      client.getContainer('c1', function(err, container) {
        assert(err);
        done(null, container);
      });
    });
  });

  describe('file apis', function() {
    var fs = require('fs');
    var client = new FileSystemProvider({
      root: path.join(__dirname, 'storage'),
    });

    it('should create a new container', function(done) {
      client.createContainer({name: 'c1'}, function(err, container) {
        assert(!err);
        done(err, container);
      });
    });

    it('should upload a file', function(done) {
      var writer = client.upload({container: 'c1', remote: 'f1.txt'});
      fs.createReadStream(path.join(__dirname, 'files/f1.txt')).pipe(writer);
      writer.on('finish', done);
      writer.on('error', done);
    });

    /* eslint-disable mocha/handle-done-callback */
    it('should fail to upload a file with invalid characters', function(done) {
      var writer = client.upload({container: 'c1', remote: 'a/f1.txt'});
      fs.createReadStream(path.join(__dirname, 'files/f1.txt')).pipe(writer);
      var cb = done;
      var clearCb = function() {};
      writer.on('error', function() {
        cb();
        cb = clearCb;
      });
      writer.on('finish', function() {
        cb(new Error('Should have finished with error callback'));
        cb = clearCb;
      });
    });
    /* eslint-enable mocha/handle-done-callback */

    it('should download a file', function(done) {
      var reader = client.download({
        container: 'c1',
        remote: 'f1.txt',
      });
      reader.pipe(
        fs.createWriteStream(path.join(__dirname, 'files/f1_downloaded.txt'))
      );
      reader.on('end', done);
      reader.on('error', done);
    });

    /* eslint-disable mocha/handle-done-callback */
    it('should fail to download a file with invalid characters', function(done) {
      var reader = client.download({container: 'c1', remote: 'a/f1.txt'});
      reader.pipe(
        fs.createWriteStream(path.join(__dirname, 'files/a-f1_downloaded.txt'))
      );
      var cb = done;
      var clearCb = function() {};
      reader.on('error', function() {
        cb();
        cb = clearCb;
      });
      reader.on('end', function() {
        cb(new Error('Expected error: Invalid name'));
        cb = clearCb;
      });
    });
    /* eslint-enable mocha/handle-done-callback */

    it('should get files for a container', function(done) {
      client.getFiles('c1', function(err, files) {
        assert(!err);
        assert.equal(files.length, 1);
        done(err, files);
      });
    });

    it('should get files for a container - promise', function(done) {
      client.getFiles('c1')
        .then(function(files) {
          assert.equal(files.length, 1);
          done();
        })
        .catch(done);
    });

    it('should get a file', function(done) {
      client.getFile('c1', 'f1.txt', function(err, f) {
        assert(!err);
        assert.ok(f);
        verifyMetadata(f, 'f1.txt');
        done(err, f);
      });
    });

    it('should get a file - promise', function(done) {
      client.getFile('c1', 'f1.txt')
        .then(function(f) {
          assert.ok(f);
          verifyMetadata(f, 'f1.txt');
          done();
        })
        .catch(done);
    });

    it('should remove a file', function(done) {
      client.removeFile('c1', 'f1.txt', function(err) {
        assert(!err);
        done(err);
      });
    });

    it('should remove a file - promise', function(done) {
      createFile('c1', 'f1.txt').then(function() {
        return client.removeFile('c1', 'f1.txt')
          .then(function() {
            done();
          });
      })
        .catch(done);
    });

    it('should get no files from a container', function(done) {
      client.getFiles('c1', function(err, files) {
        assert(!err);
        assert.equal(files.length, 0);
        done(err, files);
      });
    });

    it('should get no files from a container - promise', function(done) {
      client.getFiles('c1')
        .then(function(files) {
          assert.equal(files.length, 0);
          done();
        })
        .catch(done);
    });

    it('should not get a file from a container', function(done) {
      client.getFile('c1', 'f2.txt', function(err, f) {
        assert(err);
        assert.equal(err.code, 'ENOENT');
        assert(!f);
        done();
      });
    });

    it('should not get a file from a container - promise', function(done) {
      client.getFile('c1', 'f2.txt')
        .then(function() {
          throw new Error('should not be throw');
        })
        .catch(function(err) {
          assert.equal(err.code, 'ENOENT');
          done();
        });
    });

    it('should destroy a container c1', function(done) {
      client.destroyContainer('c1', function(err, container) {
        assert(!err);
        done(err, container);
      });
    });

    function createFile(container, file) {
      return new Promise(function(resolve, reject) {
        var writer = client.upload({container: container, remote: file});
        fs.createReadStream(path.join(__dirname, 'files/f1.txt')).pipe(writer);
        writer.on('finish', resolve);
        writer.on('error', reject);
      });
    }
  });
});