/*
 * Tencent is pleased to support the open source community by making
 * Hippy available.
 *
 * Copyright (C) 2017-2022 THL A29 Limited, a Tencent company.
 * All rights reserved.
 *
 * 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 crypto from 'crypto';
import { getOptions } from 'loader-utils';
import { GLOBAL_STYLE_NAME, GLOBAL_DISPOSE_STYLE_NAME } from '@vue/runtime/constants';
import parseCSS from './css-parser';
import translateColor, { names as colorNames } from './color-parser';

let sourceId = 0;

/**
 * Convert the CSS text to AST that able to parse by selector parser.
 */
function hippyVueCSSLoader(this: any, source: any) {
  const options = getOptions(this);
  const parsed = parseCSS(source, { source: sourceId });

  const majorNodeVersion = parseInt(process.versions.node.split('.')[0], 10);
  const hashType = majorNodeVersion >= 17 ? 'md5' : 'md4';
  const hash = crypto.createHash(hashType);
  const contentHash = hash.update(source).digest('hex');
  sourceId += 1;
  const rulesAst = parsed.stylesheet.rules.filter((n: any) => n.type === 'rule').map((n: any) => ({
    hash: contentHash,
    selectors: n.selectors,

    declarations: n.declarations.map((dec: any) => {
      let { value } = dec;
      const isVariableColor = dec.property?.startsWith('-') && typeof value === 'string'
        && (
          value.includes('#')
          || value.includes('rgb')
          || value.includes('hls')
          || value.includes('hue')
          || value.trim() in colorNames
        );
      if (dec.property && (dec.property.toLowerCase().indexOf('color') > -1 || isVariableColor)) {
        value = translateColor(value);
      }
      return {
        type: dec.type,
        property: dec.property,
        value,
      };
    }),
  }));
  const code = `(function() {
    if (!global['${GLOBAL_STYLE_NAME}']) {
      global['${GLOBAL_STYLE_NAME}'] = [];
    }
    global['${GLOBAL_STYLE_NAME}'] = global['${GLOBAL_STYLE_NAME}'].concat(${JSON.stringify(rulesAst)});

    if(module.hot) {
      module.hot.dispose(() => {
        console.log('disposeHandlers');
        if(!global['${GLOBAL_DISPOSE_STYLE_NAME}']) {
          global['${GLOBAL_DISPOSE_STYLE_NAME}'] = [];
        }
        global['${GLOBAL_DISPOSE_STYLE_NAME}'] = global['${GLOBAL_DISPOSE_STYLE_NAME}'].concat('${contentHash}');
      })
    }
  })()`;
  return `module.exports=${code}`;
}

export default hippyVueCSSLoader;