/*
 * Copyright (C) 2022 Huawei Device Co., Ltd.
 * 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.
 */

import {BaseElement, element} from "../BaseElement.js";

@element('lit-check-box')
export class LitCheckBox extends BaseElement {

    private checkbox: HTMLInputElement | undefined

    static get observedAttributes() {
        return ['checked', 'value']
    }

    get indeterminate() {
        return this.checkbox!.indeterminate;
    }

    set indeterminate(value) {
        if (value === null || value === false) {
            this.checkbox!.indeterminate = false;
        } else {
            this.checkbox!.indeterminate = true;
        }
    }

    get checked() {
        return this.getAttribute('checked') !== null;
    }

    set checked(value: boolean) {
        if (value === null || !value) {
            this.removeAttribute('checked');
        } else {
            this.setAttribute('checked', '');
        }
    }

    get value() {
        return this.getAttribute('value') || '';
    }

    set value(value: string) {
        this.setAttribute('value', value);
    }

    initHtml(): string {
        return `
        <style>
        :host{ 
            display:flex;
            opacity: 0.86;
            font-family: Helvetica;
            font-size: 14px;
            text-align: left;
            line-height: 16px;
            font-weight: 400;
        }
        #checkbox{
            position:absolute;
            clip:rect(0,0,0,0);
        }

        label{
            box-sizing:border-box;
            cursor:pointer;
            display:flex;
            align-items:center;
        }
        .chekebox{
            position:relative;
            display:flex;
            justify-content: center;
            align-items: center;
            margin-right:12px;
            width: 16px;
            height:16px;
            border: 1px solid var(--dark-color1,#4D4D4D);
            border-radius: 20%;
        }
        .chekebox::before{
            position:absolute;
            content:'';
            width:74%;
            height:0.15em;
            background:#3391FF;
            transform:scale(0);
            border-radius: 0.15em;
        }
        .chekebox{ 
            background:var(--dark-background,#FFFFFF);
        }
        .chekebox::after{
            content:'';
            position:absolute;
            width:100%;
            height:100%;
            border-radius:50%;
            background:#FFFFFF;
            opacity:0.2;
            transform:scale(0);
            z-index:-1;
        }
        #checkbox:checked:not(:indeterminate)+label .chekebox .icon{
            transform: scale(1.5);
        }
        #checkbox:checked+label .chekebox,#checkbox:indeterminate+label .chekebox{
            border-color:#3391FF;
        }
        #checkbox:indeterminate+label .chekebox::before{
            transform:scale(1);
        }
        .icon{
            width: 90%;
            height: 55%;
            transform: scale(0);
        }
        </style>
        <input type="checkbox" id="checkbox">
        <label for="checkbox">
          <span class="chekebox">
          <lit-icon name="checkmark" class="icon" color="#3391FF" size="8">
          </lit-icon>
          </span>
          <slot id="slot"></slot>
       </label>
        `;
    }

    initElements(): void {
        this.checkbox = this.shadowRoot?.getElementById('checkbox') as HTMLInputElement;
    }

    connectedCallback() {
        this.checkbox!.addEventListener('change', (ev) => {
            this.checked = this.checkbox!.checked;
            this.dispatchEvent(new CustomEvent("change", {
                detail: {
                    "checked": this.checked
                }
            }))
        })
    }

    attributeChangedCallback(name: string, oldValue: string, newValue: string) {
        if (name == 'checked' && this.checkbox) {
            this.checkbox.checked = newValue !== null;
        }
        if (name == 'value') {
            let slot = this.shadowRoot?.getElementById("slot")
            slot!.textContent = newValue
        }
    }
}