// @flow
import keyCode from '../../utils/keyCode';
import template from './templates/booleanEditor.hbs';
import BaseEditorView from './base/BaseEditorView';
import formRepository from '../formRepository';

const icons = {
    CHECKED: '<i class="fas fa-check"></i>',
    CHECKED_SOME: '<i class="fas fa-sqaure"></i>',
    SWITCH: '<i class="fas fa-circle"></i>'
};

const displayTextPositions = {
    RIGHT: 'right',
    LEFT: 'left'
};

const defaultOptions = {
    displayText: '',
    displayAsSwitch: false,
    thirdState: false,
    displayTextPosition: displayTextPositions.RIGHT,
    isJustified: true
};

/**
 * @name BooleanEditorView
 * @memberof module:core.form.editors
 * @class A simple Checkbox editor. Supported data type: <code>Boolean</code>.
 * @extends module:core.form.editors.base.BaseEditorView
 * @param {Object} options Options object. All the properties of {@link module:core.form.editors.base.BaseEditorView BaseEditorView} class are also supported.
 * @param {String} [options.displayText] Text to the right of the checkbox. Click on text triggers the checkbox.
 * @param {String} [options.displayHtml] HTML content to the right of the checkbox. Click on it triggers the checkbox.
 * @param {Boolean} [options.displayAsSwitch=false] True when the component should be displayed as a switch
 * @param {String} [options.displayTextPosition='right'] 'left' for displaing to display a label to the left of a switch
 * @param {Boolean} [options.isFullWidth=false] True when the component should be strtched to fill full width of a container
 * @param {String} [options.title] Title attribute for the editor.
 * @param {Boolean} [options.thirdState=false] Enables third state for checkbox.
 * */
export default formRepository.editors.Boolean = BaseEditorView.extend(
    {
        initialize(options = {}) {
            this.__applyOptions(options, defaultOptions);
        },

        ui: {
            displayText: '.js-editor-checkbox__display-text',
            toggleButton: '.js-editor-checkbox__toggle-button'
        },

        events: {
            'click @ui.toggleButton': '__toggle',
            'click @ui.displayText': '__toggle',
            keydown: '__onKeyDown'
        },

        className() {
            const displayTextPositionClass = this.getOption('displayTextPosition') === displayTextPositions.LEFT ? 'editor_checkbox_label-left' : '';
            const justifiedClass = this.getOption('isFullWidth') ? 'editor_checkbox_justified' : '';
            return `editor editor_checkbox ${displayTextPositionClass} ${justifiedClass}`;
        },

        attributes() {
            return {
                title: this.options.title || null
            };
        },

        template: Handlebars.compile(template),

        templateContext() {
            return {
                displayText: this.options.displayText,
                displayHtml: this.options.displayHtml,
                displayAsSwitch: this.options.displayAsSwitch
            };
        },

        __toggle() {
            if (!this.getEnabled() || this.getReadonly()) {
                return false;
            }
            this.setValue(!this.getValue());
            this.__triggerChange();
        },

        onRender() {
            this.__updateState();
        },

        onBeforeAttach() {
            //TODO: this logic is necessary as long as editor is a field
            if (!this.options.title && this.options.fieldOptions?.helpText && this.options.fieldOptions?.showHelpText) {
                this.ui.displayText[0].insertAdjacentHTML('afterend', `<div class="js-help-text-region form-label__info"></div>`);
            }
        },

        setValue(value) {
            if (this.value === value) {
                return;
            }
            this.value = value;
            this.__updateState();
        },

        isEmptyValue() {
            return typeof this.getValue() !== 'boolean';
        },

        __updateState() {
            if (!this.isRendered()) {
                return;
            }
            const toggleButtonEl = this.ui.toggleButton.get(0);
            if (this.options.displayAsSwitch) {
                toggleButtonEl.classList.toggle('checked', this.value);
                return;
            }
            if (this.value) {
                toggleButtonEl.innerHTML = icons.CHECKED;
            } else if (this.value === false || !this.options.thirdState) {
                toggleButtonEl.innerHTML = '';
            } else {
                toggleButtonEl.innerHTML = icons.CHECKED_SOME;
            }
        },

        __setReadonly(readonly) {
            BaseEditorView.prototype.__setReadonly.call(this, readonly);
            if (this.getEnabled()) {
                this.$editorEl.prop('tabindex', readonly ? -1 : 0);
            }
        },

        __onKeyDown(event) {
            if (event.ctrlKey) {
                return;
            }
            if (event.keyCode === keyCode.SPACE) {
                this.__toggle();
                event.preventDefault();
            }
        }
    }
);