/*
 * Copyright (C) 2024 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} from '../BaseElement.js';

const initHtmlStyle = `
    <style>
            :host{
                user-select: none;
                display: flex;
                font-family: Helvetica;
                font-size: 14px;
                color: #000;
                text-align: left;
                line-height: 20px;
                font-weight: 400
                background-color: #FFFFFF;
                transition: background-color .3s;
            }
            :host(:not([disabled]):hover){
                display: flex;
                background-color: var(--dark-background8,#6C9BFA);
                color: #FFFFFF;
                cursor: pointer;
            }
            :host([disabled]:hover){
                display: flex;
                /*background-color:#3391FF;*/
                /*color: #FFFFFF;*/
                cursor:not-allowed;
            }
            :host([disabled]) .root{
                cursor:not-allowed;
                display: flex;
                align-items: center;
                padding: 10px 24px;
                width: 100%;
            }
            :host(:not([disabled])) .root{
                cursor:pointer;
                display: flex;
                align-items: center;
                padding: 10px 24px;
                width: 100%;
            }
            .name{
                padding-left: 10px;
                cursor: pointer;
                overflow-wrap: anywhere;
            }
            .icon{
                pointer-events: none;
            }
            :host(:not([file])) .name{
                pointer-events: none;
            }
            :host(:not([file])) .root{
                pointer-events: none;
            }
            :host([file]) .name{
                pointer-events: none;
            }
            :host([file]) .icon{
                pointer-events: none;
            }
            
            :host([back]) {
                background-color: var(--dark-background8,#6C9BFA);
            } 
            
        </style>
    `;

export class LitMainMenuItem extends BaseElement {
  static get observedAttributes() {
    return ['title', 'icon', 'file', 'multi', 'disabled'];
  }

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

  set title(val) {
    this.setAttribute('title', val);
  }

  get multi() {
    return this.hasAttribute('multi');
  }

  set multi(val) {
    if (val) {
      this.setAttribute('multi', '');
    } else {
      this.removeAttribute('multi');
    }
  }

  get disabled() {
    return this.hasAttribute('disabled');
  }

  set disabled(val) {
    if (val) {
      this.setAttribute('disabled', val.toString());
      this.fileEL.setAttribute('disabled', val.toString());
    } else {
      this.removeAttribute('disabled');
      this.fileEL.removeAttribute('disabled');
    }
  }

  get back() {
    return this.hasAttribute('back');
  }

  set back(isShowBack) {
    if (isShowBack) {
      this.setAttribute('back', '');
    } else {
      this.removeAttribute('back');
    }
  }

  initElements() {
    this.rootEL = this.shadowRoot.querySelector('.root');
    this.titleEl = this.shadowRoot.querySelector('.name');
    this.iconEl = this.shadowRoot.querySelector('.icon');
    this.fileEL = this.shadowRoot.querySelector('.file');
  }

  isFile() {
    if (this.hasAttribute('file')) {
      if (this.fileEL) {
        return true;
      }
    }
    return false;
  }

  setupFileChangeListener() {
    if (!this.fileEL) {
       return;
    }
    this.fileEL.addEventListener('change', (event) => this.handleFileChange(event));
  }

    handleFileChange(event) {
        const files = event.target.files;
        if (!files || files.length === 0) {
           return;
        }	
        this.dispatchEvent(new CustomEvent('file-change', { detail: files[0] }));
        this.clearFileInput();
    }

    clearFileInput() {
        if (this.fileEL) {
            this.fileEL.value = '';
        }
    }

  connectedCallback() {
    if (!this.hasAttribute('file')) {
        return;
    }
    this.setupFileChangeListener();
    this.addEventListener('click', (e) => e.stopPropagation());
  }

  initHtml() {
    return `
        ${initHtmlStyle}
        <input id="file" class="file" type="file" style="display:none;pointer-events: none" />
        <label class="root" for="file">
            <lit-icon class="icon" name="user" size="20"></lit-icon>
            <label class="name"></label>
        </label>
        `;
  }

  attributeChangedCallback(name, oldValue, newValue) {
    switch (name) {
      case 'title':
        if (this.titleEl) {
          this.titleEl.textContent = newValue;
        }
        break;
      case 'icon':
        if (this.iconEl) {
          this.iconEl.setAttribute('name', newValue);
        }
        break;
    }
  }
}

if (!customElements.get('lit-main-menu-item')) {
  customElements.define('lit-main-menu-item', LitMainMenuItem);
}