// Copyright 2020 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

import * as SDK from '../../core/sdk/sdk.js';

export const enum Category {
  LAYOUT = 'Layout',
  TEXT = 'Text',
  APPEARANCE = 'Appearance',
  ANIMATION = 'Animation',
  GRID = 'Grid',
  FLEX = 'Flex',
  TABLE = 'Table',
  CSS_VARIABLES = 'CSS Variables',
  GENERATED_CONTENT = 'Generated Content',
  OTHER = 'Other',
}

export const DefaultCategoryOrder = [
  Category.LAYOUT,
  Category.TEXT,
  Category.APPEARANCE,
  Category.ANIMATION,
  Category.CSS_VARIABLES,
  Category.GRID,
  Category.FLEX,
  Category.TABLE,
  Category.GENERATED_CONTENT,
  Category.OTHER,
];

// These categories are manually updated for now. In the future
// we can try to find a way to automatically categorize them
// or find an authoritative source for the categorization:
// https://crbug.com/1117405
const CategorizedProperties = new Map([
  [
    Category.LAYOUT,
    [
      'display',       'margin',      'padding',         'height',         'width',           'position',
      'top',           'right',       'bottom',          'left',           'z-index',         'float',
      'clear',         'overflow',    'resize',          'clip',           'visibility',      'box-sizing',
      'align-content', 'align-items', 'align-self',      'flex',           'flex-basis',      'flex-direction',
      'flex-flow',     'flex-grow',   'flex-shrink',     'flex-wrap',      'justify-content', 'order',
      'inline-size',   'block-size',  'min-inline-size', 'min-block-size', 'max-inline-size', 'max-block-size',
      'min-width',     'max-width',   'min-height',      'max-height',
    ],
  ],
  [
    Category.TEXT,
    [
      'font',
      'font-family',
      'font-size',
      'font-size-adjust',
      'font-stretch',
      'font-style',
      'font-variant',
      'font-weight',
      'font-smoothing',
      'direction',
      'tab-size',
      'text-align',
      'text-align-last',
      'text-decoration',
      'text-decoration-color',
      'text-decoration-line',
      'text-decoration-style',
      'text-indent',
      'text-justify',
      'text-overflow',
      'text-shadow',
      'text-transform',
      'text-size-adjust',
      'line-height',
      'vertical-align',
      'letter-spacing',
      'word-spacing',
      'white-space',
      'word-break',
      'word-wrap',
    ],
  ],
  [
    Category.APPEARANCE,
    [
      'color',
      'outline',
      'outline-color',
      'outline-offset',
      'outline-style',
      'Outline-width',
      'border',
      'border-image',
      'background',
      'cursor',
      'box-shadow',
      '≈',
      'tap-highlight-color',
    ],
  ],
  [
    Category.ANIMATION,
    [
      'animation',
      'animation-delay',
      'animation-direction',
      'animation-duration',
      'animation-fill-mode',
      'animation-iteration-count',
      'animation-name',
      'animation-play-state',
      'animation-timing-function',
      'transition',
      'transition-delay',
      'transition-duration',
      'transition-property',
      'transition-timing-function',
    ],
  ],
  [
    Category.GRID,
    [
      'grid',
      'grid-column',
      'grid-row',
      'order',
      'place-items',
      'place-content',
      'place-self',
    ],
  ],
  [
    Category.FLEX,
    [
      'flex',
      'order',
      'place-items',
      'place-content',
      'place-self',
    ],
  ],
  [
    Category.TABLE,
    [
      'border-collapse',
      'border-spacing',
      'caption-side',
      'empty-cells',
      'table-layout',
    ],
  ],
  [
    Category.GENERATED_CONTENT,
    [
      'content',
      'quotes',
      'counter-reset',
      'counter-increment',
    ],
  ],
]);

const CategoriesByPropertyName = new Map<string, never[]>();

for (const [category, styleNames] of CategorizedProperties) {
  for (const styleName of styleNames) {
    if (!CategoriesByPropertyName.has(styleName)) {
      CategoriesByPropertyName.set(styleName, []);
    }
    const categories = (CategoriesByPropertyName.get(styleName) as Category[]);
    categories.push(category);
  }
}

const matchCategoriesByPropertyName = (propertyName: string): Category[] => {
  if (CategoriesByPropertyName.has(propertyName)) {
    return CategoriesByPropertyName.get(propertyName) as Category[];
  }
  if (propertyName.startsWith('--')) {
    return [Category.CSS_VARIABLES];
  }
  return [];
};

/**
 * Categorize a given property name to one or more categories.
 *
 * It matches against the static CategoriesByPropertyName first. It then
 * matches against several dynamic rules. It then tries to use the canonical
 * name's shorthands for matching. If nothing matches, it returns the "Other"
 * category.
 */
export const categorizePropertyName = (propertyName: string): Category[] => {
  const cssMetadata = SDK.CSSMetadata.cssMetadata();
  const canonicalName = cssMetadata.canonicalPropertyName(propertyName);
  const categories = matchCategoriesByPropertyName(canonicalName);
  if (categories.length > 0) {
    return categories;
  }

  const shorthands = cssMetadata.getShorthands(canonicalName);
  if (shorthands) {
    for (const shorthand of shorthands) {
      const shorthandCategories = matchCategoriesByPropertyName(shorthand);
      if (shorthandCategories.length > 0) {
        return shorthandCategories;
      }
    }
  }

  return [Category.OTHER];
};