// Copyright (c) Jupyter Development Team.
// Distributed under the terms of the Modified BSD License.

import { expect } from 'chai';

import { CodeMirrorEditorFactory } from '@jupyterlab/codemirror';

import { ObservableJSON } from '@jupyterlab/observables';

import { JSONEditor } from '@jupyterlab/codeeditor';

import { framePromise } from '@jupyterlab/testutils';

import { Message } from '@lumino/messaging';

import { Widget } from '@lumino/widgets';

import { simulate } from 'simulate-event';

class LogEditor extends JSONEditor {
  methods: string[] = [];

  events: string[] = [];

  handleEvent(event: Event): void {
    super.handleEvent(event);
    this.events.push(event.type);
  }

  protected onAfterAttach(msg: Message): void {
    super.onAfterAttach(msg);
    this.methods.push('onAfterAttach');
  }

  protected onAfterShow(msg: Message): void {
    super.onAfterShow(msg);
    this.methods.push('onAfterShow');
  }

  protected onUpdateRequest(msg: Message): void {
    super.onUpdateRequest(msg);
    this.methods.push('onUpdateRequest');
  }

  protected onBeforeDetach(msg: Message): void {
    super.onBeforeDetach(msg);
    this.methods.push('onBeforeDetach');
  }
}

describe('codeeditor', () => {
  describe('JSONEditor', () => {
    let editor: LogEditor;
    let editorServices = new CodeMirrorEditorFactory();
    const editorFactory = editorServices.newInlineEditor.bind(editorServices);

    beforeEach(() => {
      editor = new LogEditor({ editorFactory });
    });

    afterEach(() => {
      editor.dispose();
    });

    describe('#constructor', () => {
      it('should create a new metadata editor', () => {
        let newEditor = new JSONEditor({ editorFactory });
        expect(newEditor).to.be.an.instanceof(JSONEditor);
      });
    });

    describe('#headerNode', () => {
      it('should be the header node used by the editor', () => {
        expect(Array.from(editor.headerNode.classList)).to.contain(
          'jp-JSONEditor-header'
        );
      });
    });

    describe('#editorHostNode', () => {
      it('should be the editor host node used by the editor', () => {
        expect(Array.from(editor.editorHostNode.classList)).to.contain(
          'jp-JSONEditor-host'
        );
      });
    });

    describe('#revertButtonNode', () => {
      it('should be the revert button node used by the editor', () => {
        expect(Array.from(editor.revertButtonNode.classList)).to.contain(
          'jp-JSONEditor-revertButton'
        );
      });
    });

    describe('#commitButtonNode', () => {
      it('should be the commit button node used by the editor', () => {
        expect(Array.from(editor.commitButtonNode.classList)).to.contain(
          'jp-JSONEditor-commitButton'
        );
      });
    });

    describe('#source', () => {
      it('should be the source of the metadata', () => {
        expect(editor.source).to.equal(null);
      });

      it('should be settable', () => {
        let source = new ObservableJSON();
        editor.source = source;
        expect(editor.source).to.equal(source);
      });

      it('should update the text area value', () => {
        let model = editor.model;
        expect(model.value.text).to.equal('No data!');
        editor.source = new ObservableJSON();
        expect(model.value.text).to.equal('{}');
      });
    });

    describe('#isDirty', () => {
      it('should test whether the editor value is dirty', () => {
        expect(editor.isDirty).to.be.false;
        Widget.attach(editor, document.body);
        editor.model.value.text = 'a';
        expect(editor.isDirty).to.be.true;
      });

      it('should be dirty if the value changes while focused', () => {
        editor.source = new ObservableJSON();
        Widget.attach(editor, document.body);
        editor.editor.focus();
        expect(editor.isDirty).to.be.false;
        editor.source.set('foo', 1);
        expect(editor.isDirty).to.be.true;
      });

      it('should not be set if not focused', () => {
        editor.source = new ObservableJSON();
        Widget.attach(editor, document.body);
        expect(editor.isDirty).to.be.false;
        editor.source.set('foo', 1);
        expect(editor.isDirty).to.be.false;
      });
    });

    describe('model.value.changed', () => {
      it('should add the error flag if invalid JSON', () => {
        editor.model.value.text = 'foo';
        expect(editor.hasClass('jp-mod-error')).to.be.true;
      });

      it('should show the commit button if the value has changed', () => {
        editor.model.value.text = '{"foo": 2}';
        editor.model.value.text = '{"foo": 1}';
        expect(editor.commitButtonNode.hidden).to.be.false;
      });

      it('should not show the commit button if the value is invalid', () => {
        editor.model.value.text = 'foo';
        expect(editor.commitButtonNode.hidden).to.be.true;
      });

      it('should show the revert button if the value has changed', () => {
        editor.model.value.text = 'foo';
        expect(editor.revertButtonNode.hidden).to.be.false;
      });
    });

    describe('#handleEvent()', () => {
      beforeEach(() => {
        Widget.attach(editor, document.body);
      });

      describe('blur', () => {
        it('should handle blur events on the host node', () => {
          editor.editor.focus();
          simulate(editor.editorHostNode, 'blur');
          expect(editor.events).to.contain('blur');
        });

        it('should revert to current data if there was no change', () => {
          editor.source = new ObservableJSON();
          editor.editor.focus();
          editor.source.set('foo', 1);
          let model = editor.model;
          expect(model.value.text).to.equal('{}');
          simulate(editor.editorHostNode, 'blur');
          expect(model.value.text).to.equal('{\n    "foo": 1\n}');
        });

        it('should not revert to current data if there was a change', () => {
          editor.source = new ObservableJSON();
          editor.model.value.text = 'foo';
          editor.source.set('foo', 1);
          let model = editor.model;
          expect(model.value.text).to.equal('foo');
          simulate(editor.editorHostNode, 'blur');
          expect(model.value.text).to.equal('foo');
          expect(editor.commitButtonNode.hidden).to.be.true;
          expect(editor.revertButtonNode.hidden).to.be.false;
        });
      });

      describe('click', () => {
        it('should handle click events on the revert button', () => {
          simulate(editor.revertButtonNode, 'click');
          expect(editor.events).to.contain('click');
        });

        it('should revert the current data', () => {
          editor.source = new ObservableJSON();
          editor.model.value.text = 'foo';
          simulate(editor.revertButtonNode, 'click');
          expect(editor.model.value.text).to.equal('{}');
        });

        it('should handle programmatic changes', () => {
          editor.source = new ObservableJSON();
          editor.model.value.text = 'foo';
          editor.source.set('foo', 1);
          simulate(editor.revertButtonNode, 'click');
          expect(editor.model.value.text).to.equal('{\n    "foo": 1\n}');
        });

        it('should handle click events on the commit button', () => {
          simulate(editor.commitButtonNode, 'click');
          expect(editor.events).to.contain('click');
        });

        it('should bail if it is not valid JSON', () => {
          editor.source = new ObservableJSON();
          editor.model.value.text = 'foo';
          editor.source.set('foo', 1);
          simulate(editor.commitButtonNode, 'click');
          expect(editor.model.value.text).to.equal('foo');
        });

        it('should override a key that was set programmatically', () => {
          editor.source = new ObservableJSON();
          editor.model.value.text = '{"foo": 2}';
          editor.source.set('foo', 1);
          simulate(editor.commitButtonNode, 'click');
          expect(editor.model.value.text).to.equal('{\n    "foo": 2\n}');
        });

        it('should allow a programmatic key to update', () => {
          editor.source = new ObservableJSON();
          editor.source.set('foo', 1);
          editor.source.set('bar', 1);
          editor.model.value.text = '{"foo":1, "bar": 2}';
          editor.source.set('foo', 2);
          simulate(editor.commitButtonNode, 'click');
          let expected = '{\n    "foo": 2,\n    "bar": 2\n}';
          expect(editor.model.value.text).to.equal(expected);
        });

        it('should allow a key to be added by the user', () => {
          editor.source = new ObservableJSON();
          editor.source.set('foo', 1);
          editor.source.set('bar', 1);
          editor.model.value.text = '{"foo":1, "bar": 2, "baz": 3}';
          editor.source.set('foo', 2);
          simulate(editor.commitButtonNode, 'click');
          let value = '{\n    "foo": 2,\n    "bar": 2,\n    "baz": 3\n}';
          expect(editor.model.value.text).to.equal(value);
        });

        it('should allow a key to be removed by the user', () => {
          editor.source = new ObservableJSON();
          editor.source.set('foo', 1);
          editor.source.set('bar', 1);
          editor.model.value.text = '{"foo": 1}';
          simulate(editor.commitButtonNode, 'click');
          expect(editor.model.value.text).to.equal('{\n    "foo": 1\n}');
        });

        it('should allow a key to be removed programmatically that was not set by the user', () => {
          editor.source = new ObservableJSON();
          editor.source.set('foo', 1);
          editor.source.set('bar', 1);
          editor.model.value.text = '{"foo": 1, "bar": 3}';
          editor.source.delete('foo');
          simulate(editor.commitButtonNode, 'click');
          expect(editor.model.value.text).to.equal('{\n    "bar": 3\n}');
        });

        it('should keep a key that was removed programmatically that was changed by the user', () => {
          editor.source = new ObservableJSON();
          editor.source.set('foo', 1);
          editor.source.set('bar', 1);
          editor.model.value.text = '{"foo": 2, "bar": 3}';
          editor.source.set('foo', null);
          simulate(editor.commitButtonNode, 'click');
          let expected = '{\n    "foo": 2,\n    "bar": 3\n}';
          expect(editor.model.value.text).to.equal(expected);
        });
      });
    });

    describe('#onAfterAttach()', () => {
      it('should add event listeners', () => {
        Widget.attach(editor, document.body);
        expect(editor.methods).to.contain('onAfterAttach');
        editor.editor.focus();
        simulate(editor.editorHostNode, 'blur');
        simulate(editor.revertButtonNode, 'click');
        simulate(editor.commitButtonNode, 'click');
        expect(editor.events).to.eql(['blur', 'click', 'click']);
      });
    });

    describe('#onAfterShow()', () => {
      it('should update the editor', async () => {
        editor.hide();
        Widget.attach(editor, document.body);
        editor.show();
        await framePromise();
        expect(editor.methods).to.contain('onUpdateRequest');
      });
    });

    describe('#onBeforeDetach()', () => {
      it('should remove event listeners', () => {
        Widget.attach(editor, document.body);
        Widget.detach(editor);
        expect(editor.methods).to.contain('onBeforeDetach');
        editor.editor.focus();
        simulate(editor.editorHostNode, 'blur');
        simulate(editor.revertButtonNode, 'click');
        simulate(editor.commitButtonNode, 'click');
        expect(editor.events).to.eql([]);
      });
    });

    describe('#source.changed', () => {
      it('should update the value', () => {
        editor.source = new ObservableJSON();
        editor.source.set('foo', 1);
        expect(editor.model.value.text).to.equal('{\n    "foo": 1\n}');
      });

      it('should bail if the input is dirty', () => {
        Widget.attach(editor, document.body);
        editor.source = new ObservableJSON();
        editor.model.value.text = 'ha';
        editor.source.set('foo', 2);
        expect(editor.model.value.text).to.equal('ha');
      });

      it('should bail if the input is focused', () => {
        Widget.attach(editor, document.body);
        editor.model.value.text = '{}';
        editor.source = new ObservableJSON();
        editor.editor.focus();
        editor.source.set('foo', 2);
        expect(editor.model.value.text).to.equal('{}');
      });
    });
  });
});
