"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.default = void 0;

var _postcssValueParser = _interopRequireDefault(require("postcss-value-parser"));

var _map = _interopRequireDefault(require("./lib/map"));

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }

function evenValues(list, index) {
  return index % 2 === 0;
}

const repeatKeywords = [..._map.default.values()];

function isCommaNode(node) {
  return node.type === 'div' && node.value === ',';
}

function isVariableFunctionNode(node) {
  if (node.type !== 'function') {
    return false;
  }

  return ['var', 'env'].includes(node.value.toLowerCase());
}

function transform(value) {
  const parsed = (0, _postcssValueParser.default)(value);

  if (parsed.nodes.length === 1) {
    return value;
  }

  const ranges = [];
  let rangeIndex = 0;
  let shouldContinue = true;
  parsed.nodes.forEach((node, index) => {
    // After comma (`,`) follows next background
    if (isCommaNode(node)) {
      rangeIndex += 1;
      shouldContinue = true;
      return;
    }

    if (!shouldContinue) {
      return;
    } // After separator (`/`) follows `background-size` values
    // Avoid them


    if (node.type === 'div' && node.value === '/') {
      shouldContinue = false;
      return;
    }

    if (!ranges[rangeIndex]) {
      ranges[rangeIndex] = {
        start: null,
        end: null
      };
    } // Do not try to be processed `var and `env` function inside background


    if (isVariableFunctionNode(node)) {
      shouldContinue = false;
      ranges[rangeIndex].start = null;
      ranges[rangeIndex].end = null;
      return;
    }

    const isRepeatKeyword = node.type === 'word' && repeatKeywords.includes(node.value.toLowerCase());

    if (ranges[rangeIndex].start === null && isRepeatKeyword) {
      ranges[rangeIndex].start = index;
      ranges[rangeIndex].end = index;
      return;
    }

    if (ranges[rangeIndex].start !== null) {
      if (node.type === 'space') {
        return;
      } else if (isRepeatKeyword) {
        ranges[rangeIndex].end = index;
        return;
      }

      return;
    }
  });
  ranges.forEach(range => {
    if (range.start === null) {
      return;
    }

    const nodes = parsed.nodes.slice(range.start, range.end + 1);

    if (nodes.length !== 3) {
      return;
    }

    const key = nodes.filter(evenValues).map(n => n.value.toLowerCase()).toString();

    const match = _map.default.get(key);

    if (match) {
      nodes[0].value = match;
      nodes[1].value = nodes[2].value = '';
    }
  });
  return parsed.toString();
}

function pluginCreator() {
  return {
    postcssPlugin: 'postcss-normalize-repeat-style',

    prepare() {
      const cache = new Map();
      return {
        OnceExit(css) {
          css.walkDecls(/^(background(-repeat)?|(-\w+-)?mask-repeat)$/i, decl => {
            const value = decl.value;

            if (!value) {
              return;
            }

            if (cache.has(value)) {
              decl.value = cache.get(value);
              return;
            }

            const result = transform(value);
            decl.value = result;
            cache.set(value, result);
          });
        }

      };
    }

  };
}

pluginCreator.postcss = true;
var _default = pluginCreator;
exports.default = _default;
module.exports = exports.default;