/*
 * Copyright 2016 resin.io
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

'use strict';

const m = require('mochainon');
const _ = require('lodash');
const errors = require('../../lib/shared/errors');

describe('Shared: Errors', function() {

  describe('.HUMAN_FRIENDLY', function() {

    it('should be a plain object', function() {
      m.chai.expect(_.isPlainObject(errors.HUMAN_FRIENDLY)).to.be.true;
    });

    it('should contain title and description function properties', function() {
      m.chai.expect(_.every(_.map(errors.HUMAN_FRIENDLY, (error) => {
        return _.isFunction(error.title) && _.isFunction(error.description);
      }))).to.be.true;
    });

  });

  describe('.shouldReport()', function() {

    it('should return true for a string error', function() {
      const error = 'foo';
      m.chai.expect(errors.shouldReport(error)).to.be.true;
    });

    it('should return true for a number 0 error', function() {
      const error = 0;
      m.chai.expect(errors.shouldReport(error)).to.be.true;
    });

    it('should return true for a number 1 error', function() {
      const error = 1;
      m.chai.expect(errors.shouldReport(error)).to.be.true;
    });

    it('should return true for a number -1 error', function() {
      const error = -1;
      m.chai.expect(errors.shouldReport(error)).to.be.true;
    });

    it('should return true for an array error', function() {
      const error = [ 1, 2, 3 ];
      m.chai.expect(errors.shouldReport(error)).to.be.true;
    });

    it('should return true for an undefined error', function() {
      const error = undefined;
      m.chai.expect(errors.shouldReport(error)).to.be.true;
    });

    it('should return true for a null error', function() {
      const error = null;
      m.chai.expect(errors.shouldReport(error)).to.be.true;
    });

    it('should return true for an empty object error', function() {
      const error = {};
      m.chai.expect(errors.shouldReport(error)).to.be.true;
    });

    it('should return true for a basic error', function() {
      const error = new Error('foo');
      m.chai.expect(errors.shouldReport(error)).to.be.true;
    });

    it('should return true for an error with a report true property', function() {
      const error = new Error('foo');
      error.report = true;
      m.chai.expect(errors.shouldReport(error)).to.be.true;
    });

    it('should return false for an error with a report false property', function() {
      const error = new Error('foo');
      error.report = false;
      m.chai.expect(errors.shouldReport(error)).to.be.false;
    });

    it('should return false for an error with a report undefined property', function() {
      const error = new Error('foo');
      error.report = undefined;
      m.chai.expect(errors.shouldReport(error)).to.be.false;
    });

    it('should return false for an error with a report null property', function() {
      const error = new Error('foo');
      error.report = null;
      m.chai.expect(errors.shouldReport(error)).to.be.false;
    });

    it('should return false for an error with a report 0 property', function() {
      const error = new Error('foo');
      error.report = 0;
      m.chai.expect(errors.shouldReport(error)).to.be.false;
    });

    it('should return true for an error with a report 1 property', function() {
      const error = new Error('foo');
      error.report = 1;
      m.chai.expect(errors.shouldReport(error)).to.be.true;
    });

    it('should cast the report property to boolean', function() {
      const error = new Error('foo');
      error.report = '';
      m.chai.expect(errors.shouldReport(error)).to.be.false;
    });

  });

  describe('.getTitle()', function() {

    it('should accept a string', function() {
      const error = 'This is an error';
      m.chai.expect(errors.getTitle(error)).to.equal('This is an error');
    });

    it('should accept a number 0', function() {
      const error = 0;
      m.chai.expect(errors.getTitle(error)).to.equal('0');
    });

    it('should accept a number 1', function() {
      const error = 1;
      m.chai.expect(errors.getTitle(error)).to.equal('1');
    });

    it('should accept a number -1', function() {
      const error = -1;
      m.chai.expect(errors.getTitle(error)).to.equal('-1');
    });

    it('should accept an array', function() {
      const error = [ 0, 1, 2 ];
      m.chai.expect(errors.getTitle(error)).to.equal('0,1,2');
    });

    it('should return a generic error message if the error is an empty object', function() {
      const error = {};
      m.chai.expect(errors.getTitle(error)).to.equal('An error ocurred');
    });

    it('should return a generic error message if the error is undefined', function() {
      const error = undefined;
      m.chai.expect(errors.getTitle(error)).to.equal('An error ocurred');
    });

    it('should return a generic error message if the error is null', function() {
      const error = null;
      m.chai.expect(errors.getTitle(error)).to.equal('An error ocurred');
    });

    it('should return the error message', function() {
      const error = new Error('This is an error');
      m.chai.expect(errors.getTitle(error)).to.equal('This is an error');
    });

    it('should return the error code if there is no message', function() {
      const error = new Error();
      error.code = 'MYERROR';
      m.chai.expect(errors.getTitle(error)).to.equal('Error code: MYERROR');
    });

    it('should prioritise the message over the code', function() {
      const error = new Error('Foo bar');
      error.code = 'MYERROR';
      m.chai.expect(errors.getTitle(error)).to.equal('Foo bar');
    });

    it('should prioritise the code over the message if the message is an empty string', function() {
      const error = new Error('');
      error.code = 'MYERROR';
      m.chai.expect(errors.getTitle(error)).to.equal('Error code: MYERROR');
    });

    it('should prioritise the code over the message if the message is a blank string', function() {
      const error = new Error('    ');
      error.code = 'MYERROR';
      m.chai.expect(errors.getTitle(error)).to.equal('Error code: MYERROR');
    });

    it('should understand an error-like object with a code', function() {
      const error = {
        code: 'MYERROR'
      };

      m.chai.expect(errors.getTitle(error)).to.equal('Error code: MYERROR');
    });

    it('should understand an error-like object with a message', function() {
      const error = {
        message: 'Hello world'
      };

      m.chai.expect(errors.getTitle(error)).to.equal('Hello world');
    });

    it('should understand an error-like object with a message and a code', function() {
      const error = {
        message: 'Hello world',
        code: 'MYERROR'
      };

      m.chai.expect(errors.getTitle(error)).to.equal('Hello world');
    });

    it('should display an error code 0', function() {
      const error = new Error();
      error.code = 0;
      m.chai.expect(errors.getTitle(error)).to.equal('Error code: 0');
    });

    it('should display an error code 1', function() {
      const error = new Error();
      error.code = 1;
      m.chai.expect(errors.getTitle(error)).to.equal('Error code: 1');
    });

    it('should display an error code -1', function() {
      const error = new Error();
      error.code = -1;
      m.chai.expect(errors.getTitle(error)).to.equal('Error code: -1');
    });

    it('should not display an empty string error code', function() {
      const error = new Error();
      error.code = '';
      m.chai.expect(errors.getTitle(error)).to.equal('An error ocurred');
    });

    it('should not display a blank string error code', function() {
      const error = new Error();
      error.code = '   ';
      m.chai.expect(errors.getTitle(error)).to.equal('An error ocurred');
    });

    it('should return a generic error message if no information was found', function() {
      const error = new Error();
      m.chai.expect(errors.getTitle(error)).to.equal('An error ocurred');
    });

    it('should return a generic error message if no code and the message is empty', function() {
      const error = new Error('');
      m.chai.expect(errors.getTitle(error)).to.equal('An error ocurred');
    });

    it('should return a generic error message if no code and the message is blank', function() {
      const error = new Error('   ');
      m.chai.expect(errors.getTitle(error)).to.equal('An error ocurred');
    });

    it('should rephrase an ENOENT error', function() {
      const error = new Error('ENOENT error');
      error.path = '/foo/bar';
      error.code = 'ENOENT';
      m.chai.expect(errors.getTitle(error)).to.equal('No such file or directory: /foo/bar');
    });

    it('should rephrase an EPERM error', function() {
      const error = new Error('EPERM error');
      error.code = 'EPERM';
      m.chai.expect(errors.getTitle(error)).to.equal('You\'re not authorized to perform this operation');
    });

    it('should rephrase an EACCES error', function() {
      const error = new Error('EACCES error');
      error.code = 'EACCES';
      m.chai.expect(errors.getTitle(error)).to.equal('You don\'t have access to this resource');
    });

    it('should rephrase an ENOMEM error', function() {
      const error = new Error('ENOMEM error');
      error.code = 'ENOMEM';
      m.chai.expect(errors.getTitle(error)).to.equal('Your system ran out of memory');
    });

  });

  describe('.getDescription()', function() {

    it('should return an empty string if the error is a string', function() {
      const error = 'My error';
      m.chai.expect(errors.getDescription(error)).to.equal('');
    });

    it('should return an empty string if the error is a number', function() {
      const error = 0;
      m.chai.expect(errors.getDescription(error)).to.equal('');
    });

    it('should return an empty string if the error is an array', function() {
      const error = [ 1, 2, 3 ];
      m.chai.expect(errors.getDescription(error)).to.equal('');
    });

    it('should return an empty string if the error is undefined', function() {
      const error = undefined;
      m.chai.expect(errors.getDescription(error)).to.equal('');
    });

    it('should return an empty string if the error is null', function() {
      const error = null;
      m.chai.expect(errors.getDescription(error)).to.equal('');
    });

    it('should return an empty string if the error is an empty object', function() {
      const error = {};
      m.chai.expect(errors.getDescription(error)).to.equal('');
    });

    it('should understand an error-like object with a description', function() {
      const error = {
        description: 'My description'
      };

      m.chai.expect(errors.getDescription(error)).to.equal('My description');
    });

    it('should understand an error-like object with a stack', function() {
      const error = {
        stack: 'My stack'
      };

      m.chai.expect(errors.getDescription(error)).to.equal('My stack');
    });

    it('should understand an error-like object with a description and a stack', function() {
      const error = {
        description: 'My description',
        stack: 'My stack'
      };

      m.chai.expect(errors.getDescription(error)).to.equal('My description');
    });

    it('should stringify and beautify an object without any known property', function() {
      const error = {
        name: 'John Doe',
        job: 'Developer'
      };

      m.chai.expect(errors.getDescription(error)).to.equal([
        '{',
        '  "name": "John Doe",',
        '  "job": "Developer"',
        '}'
      ].join('\n'));
    });

    it('should return the stack for a basic error', function() {
      const error = new Error('Foo');
      m.chai.expect(errors.getDescription(error)).to.equal(error.stack);
    });

    it('should prefer a description property to a stack', function() {
      const error = new Error('Foo');
      error.description = 'My description';
      m.chai.expect(errors.getDescription(error)).to.equal('My description');
    });

    it('should return the stack if the description is an empty string', function() {
      const error = new Error('Foo');
      error.description = '';
      m.chai.expect(errors.getDescription(error)).to.equal(error.stack);
    });

    it('should return the stack if the description is a blank string', function() {
      const error = new Error('Foo');
      error.description = '   ';
      m.chai.expect(errors.getDescription(error)).to.equal(error.stack);
    });

    it('should get a generic description for ENOENT', function() {
      const error = new Error('Foo');
      error.code = 'ENOENT';
      m.chai.expect(errors.getDescription(error)).to.equal('The file you\'re trying to access doesn\'t exist');
    });

    it('should get a generic description for EPERM', function() {
      const error = new Error('Foo');
      error.code = 'EPERM';
      m.chai.expect(errors.getDescription(error)).to.equal('Please ensure you have necessary permissions for this task');
    });

    it('should get a generic description for EACCES', function() {
      const error = new Error('Foo');
      error.code = 'EACCES';
      const message = 'Please ensure you have necessary permissions to access this resource';
      m.chai.expect(errors.getDescription(error)).to.equal(message);
    });

    it('should get a generic description for ENOMEM', function() {
      const error = new Error('Foo');
      error.code = 'ENOMEM';
      const message = 'Please make sure your system has enough available memory for this task';
      m.chai.expect(errors.getDescription(error)).to.equal(message);
    });

    it('should prefer a description property than a code description', function() {
      const error = new Error('Foo');
      error.code = 'ENOMEM';
      error.description = 'Memory error';
      m.chai.expect(errors.getDescription(error)).to.equal('Memory error');
    });

    describe('given userFriendlyDescriptionsOnly is false', function() {

      it('should return the stack for a basic error', function() {
        const error = new Error('Foo');
        m.chai.expect(errors.getDescription(error, {
          userFriendlyDescriptionsOnly: false
        })).to.equal(error.stack);
      });

      it('should return the stack if the description is an empty string', function() {
        const error = new Error('Foo');
        error.description = '';
        m.chai.expect(errors.getDescription(error, {
          userFriendlyDescriptionsOnly: false
        })).to.equal(error.stack);
      });

      it('should return the stack if the description is a blank string', function() {
        const error = new Error('Foo');
        error.description = '   ';
        m.chai.expect(errors.getDescription(error, {
          userFriendlyDescriptionsOnly: false
        })).to.equal(error.stack);
      });

    });

    describe('given userFriendlyDescriptionsOnly is true', function() {

      it('should return an empty string for a basic error', function() {
        const error = new Error('Foo');
        m.chai.expect(errors.getDescription(error, {
          userFriendlyDescriptionsOnly: true
        })).to.equal('');
      });

      it('should return an empty string if the description is an empty string', function() {
        const error = new Error('Foo');
        error.description = '';
        m.chai.expect(errors.getDescription(error, {
          userFriendlyDescriptionsOnly: true
        })).to.equal('');
      });

      it('should return an empty string if the description is a blank string', function() {
        const error = new Error('Foo');
        error.description = '   ';
        m.chai.expect(errors.getDescription(error, {
          userFriendlyDescriptionsOnly: true
        })).to.equal('');
      });

    });

  });

  describe('.createError()', function() {

    it('should report the resulting error by default', function() {
      const error = errors.createError('Foo', 'Something happened');
      m.chai.expect(errors.shouldReport(error)).to.be.true;
    });

    it('should not report the error if report is false', function() {
      const error = errors.createError('Foo', 'Something happened', {
        report: false
      });

      m.chai.expect(errors.shouldReport(error)).to.be.false;
    });

    it('should not report the error if report evaluates to false', function() {
      const error = errors.createError('Foo', 'Something happened', {
        report: 0
      });

      m.chai.expect(errors.shouldReport(error)).to.be.false;
    });

    it('should be an instance of Error', function() {
      const error = errors.createError('Foo', 'Something happened');
      m.chai.expect(error).to.be.an.instanceof(Error);
    });

    it('should correctly add both a message and a description', function() {
      const error = errors.createError('Foo', 'Something happened');
      m.chai.expect(errors.getTitle(error)).to.equal('Foo');
      m.chai.expect(errors.getDescription(error)).to.equal('Something happened');
    });

    it('should correctly add only a message', function() {
      const error = errors.createError('Foo');
      m.chai.expect(errors.getTitle(error)).to.equal('Foo');
      m.chai.expect(errors.getDescription(error)).to.equal(error.stack);
    });

    it('should ignore an empty description', function() {
      const error = errors.createError('Foo', '');
      m.chai.expect(errors.getDescription(error)).to.equal(error.stack);
    });

    it('should ignore a blank description', function() {
      const error = errors.createError('Foo', '    ');
      m.chai.expect(errors.getDescription(error)).to.equal(error.stack);
    });

    it('should throw if no message', function() {
      m.chai.expect(() => {
        errors.createError();
      }).to.throw('Invalid error title: undefined');
    });

    it('should throw if message is empty', function() {
      m.chai.expect(() => {
        errors.createError('');
      }).to.throw('Invalid error title: ');
    });

    it('should throw if message is blank', function() {
      m.chai.expect(() => {
        errors.createError('   ');
      }).to.throw('Invalid error title:    ');
    });

  });

  describe('.createUserError()', function() {

    it('should not report the resulting error', function() {
      const error = errors.createUserError('Foo', 'Something happened');
      m.chai.expect(errors.shouldReport(error)).to.be.false;
    });

    it('should be an instance of Error', function() {
      const error = errors.createUserError('Foo', 'Something happened');
      m.chai.expect(error).to.be.an.instanceof(Error);
    });

    it('should correctly add both a message and a description', function() {
      const error = errors.createUserError('Foo', 'Something happened');
      m.chai.expect(errors.getTitle(error)).to.equal('Foo');
      m.chai.expect(errors.getDescription(error)).to.equal('Something happened');
    });

    it('should correctly add only a message', function() {
      const error = errors.createUserError('Foo');
      m.chai.expect(errors.getTitle(error)).to.equal('Foo');
      m.chai.expect(errors.getDescription(error)).to.equal(error.stack);
    });

    it('should ignore an empty description', function() {
      const error = errors.createUserError('Foo', '');
      m.chai.expect(errors.getDescription(error)).to.equal(error.stack);
    });

    it('should ignore a blank description', function() {
      const error = errors.createUserError('Foo', '    ');
      m.chai.expect(errors.getDescription(error)).to.equal(error.stack);
    });

    it('should throw if no message', function() {
      m.chai.expect(() => {
        errors.createUserError();
      }).to.throw('Invalid error title: undefined');
    });

    it('should throw if message is empty', function() {
      m.chai.expect(() => {
        errors.createUserError('');
      }).to.throw('Invalid error title: ');
    });

    it('should throw if message is blank', function() {
      m.chai.expect(() => {
        errors.createUserError('   ');
      }).to.throw('Invalid error title:    ');
    });

  });

  describe('.toJSON()', function() {

    it('should convert a simple error', function() {
      const error = new Error('My error');
      m.chai.expect(errors.toJSON(error)).to.deep.equal({
        code: undefined,
        description: undefined,
        message: 'My error',
        stack: error.stack,
        report: undefined
      });
    });

    it('should convert an error with a description', function() {
      const error = new Error('My error');
      error.description = 'My description';

      m.chai.expect(errors.toJSON(error)).to.deep.equal({
        code: undefined,
        description: 'My description',
        message: 'My error',
        stack: error.stack,
        report: undefined
      });
    });

    it('should convert an error with a code', function() {
      const error = new Error('My error');
      error.code = 'ENOENT';

      m.chai.expect(errors.toJSON(error)).to.deep.equal({
        code: 'ENOENT',
        description: undefined,
        message: 'My error',
        stack: error.stack,
        report: undefined
      });
    });

    it('should convert an error with a description and a code', function() {
      const error = new Error('My error');
      error.description = 'My description';
      error.code = 'ENOENT';

      m.chai.expect(errors.toJSON(error)).to.deep.equal({
        code: 'ENOENT',
        description: 'My description',
        message: 'My error',
        stack: error.stack,
        report: undefined
      });
    });

    it('should convert an error with a report value', function() {
      const error = new Error('My error');
      error.report = true;

      m.chai.expect(errors.toJSON(error)).to.deep.equal({
        code: undefined,
        description: undefined,
        message: 'My error',
        stack: error.stack,
        report: true
      });
    });

    it('should convert an error without a message', function() {
      const error = new Error();

      m.chai.expect(errors.toJSON(error)).to.deep.equal({
        code: undefined,
        description: undefined,
        message: '',
        stack: error.stack,
        report: undefined
      });
    });

  });

  describe('.fromJSON()', function() {

    it('should return an Error object', function() {
      const error = new Error('My error');
      const result = errors.fromJSON(errors.toJSON(error));
      m.chai.expect(result).to.be.an.instanceof(Error);
    });

    it('should convert a simple JSON error', function() {
      const error = new Error('My error');
      const result = errors.fromJSON(errors.toJSON(error));

      m.chai.expect(result.message).to.equal(error.message);
      m.chai.expect(result.description).to.equal(error.description);
      m.chai.expect(result.code).to.equal(error.code);
      m.chai.expect(result.stack).to.equal(error.stack);
      m.chai.expect(result.report).to.equal(error.report);
    });

    it('should convert a JSON error with a description', function() {
      const error = new Error('My error');
      error.description = 'My description';
      const result = errors.fromJSON(errors.toJSON(error));

      m.chai.expect(result.message).to.equal(error.message);
      m.chai.expect(result.description).to.equal(error.description);
      m.chai.expect(result.code).to.equal(error.code);
      m.chai.expect(result.stack).to.equal(error.stack);
      m.chai.expect(result.report).to.equal(error.report);
    });

    it('should convert a JSON error with a code', function() {
      const error = new Error('My error');
      error.code = 'ENOENT';
      const result = errors.fromJSON(errors.toJSON(error));

      m.chai.expect(result.message).to.equal(error.message);
      m.chai.expect(result.description).to.equal(error.description);
      m.chai.expect(result.code).to.equal(error.code);
      m.chai.expect(result.stack).to.equal(error.stack);
      m.chai.expect(result.report).to.equal(error.report);
    });

    it('should convert a JSON error with a report value', function() {
      const error = new Error('My error');
      error.report = false;
      const result = errors.fromJSON(errors.toJSON(error));

      m.chai.expect(result.message).to.equal(error.message);
      m.chai.expect(result.description).to.equal(error.description);
      m.chai.expect(result.code).to.equal(error.code);
      m.chai.expect(result.stack).to.equal(error.stack);
      m.chai.expect(result.report).to.equal(error.report);
    });

  });

});