# Source: alpha/simple-switch.js

    /** Define a new zero dependency custom web component ECMA module that can be used as an HTML tag
     *
     * TO USE THIS TEMPLATE: CHANGE ALL INSTANCES OF 'SimpleSwitch' and 'simple-switch' & change version below
     *
     * version 0.1 2022-07-15 Pre-release
     *
     * See: https://web.dev/custom-elements-v1/, https://web.dev/shadowdom-v1/
     *
     * See https://github.com/runem/web-component-analyzer#-how-to-document-your-components-using-jsdoc on how to document
     * Use `npx web-component-analyzer ./components/button-send.js` to create/update the documentation
     *     or paste into https://runem.github.io/web-component-analyzer/
     * Use `npx web-component-analyzer ./components/*.js --format vscode --outFile ./vscode-descriptors/ti-web-components.html-data.json`
     *     to generate/update vscode custom data files. See https://github.com/microsoft/vscode-custom-data/tree/main/samples/webcomponents
     *
     */
    /**
     * Copyright (c) 2022-2025 Julian Knight (Totally Information)
     * https://it.knightnet.org.uk, https://github.com/TotallyInformation
     *
     * 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.
     */

    /**
     * Refs:
     * - https://discourse.nodered.org/t/size-of-custom-mdi-switch-icon/91280/9
     */

    const componentName = 'simple-switch'
    const className = 'SimpleSwitch'

    const template = document.createElement('template')
    template.innerHTML = /*html*/`
        <style>
            :host {
                display: block;   /* default is inline */
                contain: content; /* performance boost */
                .gui-switch {
                    --thumb-size: 2rem;
                    --thumb: hsl(0 0% 100%);
                    --thumb-highlight: hsl(0 0% 0% / 25%);

                    --thumb-color: var(--thumb);
                    --thumb-color-highlight: var(--thumb-highlight);

                    @media (prefers-color-scheme: dark) {
                        --thumb: hsl(0 0% 5%);
                        --thumb-highlight: hsl(0 0% 100% / 25%);
                    }

                    display: flex;
                    flex-direction: row; /* column; */
                    align-items: center;
                    gap: 2ch;
                    justify-content: space-between;
                }
                input {
                    width: 0;
                        overflow: hidden;
                        padding-left: 68px;
                        background: #c5c5c5 url() 2px center / auto 32px no-repeat;
                        border-radius: 18px;
                        border: 0;
                        color: transparent;
                        height: 36px;
                        transition: all 0.3s ease-in-out;
                }
                input:not([disabled]) {cursor: pointer;}
                input.active {
                    background-color: #8ab82e;
                    background-position: calc(100% - 2px) center;
                }
                input.vertical {transform: rotate(-90deg);}
                /* .gui-switch > input {
                    appearance: none;

                    inline-size: var(--track-size);
                    block-size: var(--thumb-size);
                    padding: var(--track-padding);

                    flex-shrink: 0;
                    display: grid;
                    align-items: center;
                    grid: [track] 1fr / [track] 1fr;
                }
                .gui-switch > input::before {
                    content: "";
                    grid-area: track;
                    inline-size: var(--thumb-size);
                    block-size: var(--thumb-size);
                    background: var(--thumb-color);
                    border-radius: 50%;
                } */
            }
        </style>
        <!-- <label for="switch" class="gui-switch">
            <slot>Label text</slot>
            <input type="checkbox" role="switch" id="switch">
        </label> -->
        <label for="switch" class="gui-switch">
            <slot>Switch me</slot>
            <input type="button"
                class="switch active"
                onclick="this.classList.toggle('active');"
                value="Toggle me"
                title="Toggle me">
        </label>
    `

    // Define the class and make it the default export
    /**
     * @element simple-switch
     *
     * fires simple-switch:construction - Document object event. evt.details contains the data
     * fires simple-switch:connected - When an instance of the component is attached to the DOM. `evt.details` contains the details of the element.
     * fires simple-switch:disconnected - When an instance of the component is removed from the DOM. `evt.details` contains the details of the element.
     * fires simple-switch:attribChanged - When a watched attribute changes. `evt.details` contains the details of the change.
     * NOTE that listeners can be attached either to the `document` or to the specific element instance.
     *
     * @property {string} name - Optional. Will be used to synthesize an ID if no ID is provided.
     * attr {string} data-* - Optional. All data-* attributes are returned in the _meta prop as a _meta.data object.
     *
     * @slot Container contents
     *
     * @csspart ??? - Uses the uib-styles.css uibuilder master for variables where available.
     */
    export default class SimpleSwitch extends HTMLElement {
        //#region ---- Class Variables ----

        /** Standard _ui object to include in msgs */
        _ui = {
            type: componentName,
            event: undefined,
            id: undefined,
            name: undefined,
            data: undefined, // All of the data-* attributes as an object
        }

        /** Mini jQuery-like shadow dom selector (see constructor) */
        $

        /** Holds the name for this instance of the component */
        name = undefined

        /** Holds a count of how many instances of this component are on the page */
        static _iCount = 0

        //#endregion ---- ---- ---- ----

        //#region ---- Utility Functions ----

        //#endregion ---- ---- ---- ----

        //#region ---- Event Handlers ----

        /** Handle a `uibuilder:msg:_ui:update:${this.id}` custom event
         * @param {CustomEvent} evt uibuilder `uibuilder:msg:_ui:update:${this.id}` custom event evt.details contains the data
         */
        _uibMsgHandler(evt) {
            // If there is a payload, we want to replace the slot - easiest done from the light DOM
            // if ( evt['detail'].payload ) {
            //     const el = document.getElementById(this.id)
            //     el.innerHTML = evt['detail'].payload
            // }
            // If there is a payload, we want to replace the VALUE
            // if ( evt['detail'].payload ) {
            //     const el = this.shadowRoot.getElementById('value')
            //     el.innerHTML = evt['detail'].payload
            // }
        }

        //#endregion ---- ---- ---- ----

        constructor() {

            super()
            this.attachShadow({ mode: 'open', delegatesFocus: true, })
                .append(template.content.cloneNode(true))

            this.$ = this.shadowRoot.querySelector.bind(this.shadowRoot)

            this.dispatchEvent(new Event(`${componentName}:construction`, { bubbles: true, composed: true, }))

        } // ---- end of constructor ----

        // List all attribs we want to observe
        static get observedAttributes() { return [
            'name'
        ] }

        // Runs when an observed attribute changes - Note: values are always strings
        attributeChangedCallback(name, oldVal, newVal) {

            // Don't bother if the new value same as old
            if ( oldVal === newVal ) return

            // Create a property from the value - WARN: Be careful with name clashes
            this[name] = newVal

            this.dispatchEvent(new CustomEvent(`${componentName}:attribChanged`, {
                bubbles: true,
                composed: true,
                detail: {
                    id: this.id,
                    name: this.name,
                    attribute: name,
                    newVal: newVal,
                    oldVal: oldVal,
                },
            } ) )

        } // --- end of attributeChangedCallback --- //

        // Runs when an instance is added to the DOM
        connectedCallback() {
            ++SimpleSwitch._iCount // increment total instance count

            // Create an id from name or calculation if needed
            this.name = this.getAttribute('name')
            if (!this.id) {
                if (this.name) this.id = this.name.toLowerCase().replace(/\s/g, '_')
                else this.id = `sc-${SimpleSwitch._iCount}`
            }

            // Listen for a uibuilder msg that is targetted at this instance of the component
            document.addEventListener(`uibuilder:msg:_ui:update:${this.id}`, this._uibMsgHandler.bind(this) )

            this.dispatchEvent(new CustomEvent(`${componentName}:connected`, {
                bubbles: true,
                composed: true,
                detail: {
                    id: this.id,
                    name: this.name,
                },
            } ) )

        } // ---- end of connectedCallback ---- //

        // Runs when an instance is removed from the DOM
        disconnectedCallback() {
            // NB: Dont decrement SimpleCard._iCount because that could lead to id nameclashes

            // @ts-ignore
            document.removeEventListener(`uibuilder:msg:_ui:update:${this.id}`, this._uibMsgHandler )

            this.dispatchEvent(new CustomEvent(`${componentName}:disconnected`, {
                bubbles: true,
                composed: true,
                detail: {
                    id: this.id,
                    name: this.name,
                },
            } ) )

        } // ---- end of disconnectedCallback ---- //

    } // ---- end of Class ---- //

    /** Self register the class to global
     * Enables new data lists to be dynamically added via JS
     * and lets the static methods be called
     */
    window[className] = SimpleSwitch

    // Self-register the HTML tag
    customElements.define(componentName, SimpleSwitch)