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/* @flow */
"use strict";

const _ = require("lodash");

/*:: type rangeDataType = {
  all: Array<Object>,
}
*/

/*:: type rangeType = {
  unusedRule: string,
  end?: number,
  start: number,
  used?: boolean,
}*/

/*:: type unusedRangeT = {
  start: number,
  end?: number,
}*/

module.exports = function(
  results /*: Array<stylelint$result>*/
) /*: stylelint$needlessDisablesReport*/ {
  const report = [];

  results.forEach(result => {
    // File with `CssSyntaxError` have not `_postcssResult`
    if (!result._postcssResult) {
      return;
    }

    const unused = { source: result.source, ranges: [] };
    const rangeData /*: ?rangeDataType*/ = _.cloneDeep(
      result._postcssResult.stylelint.disabledRanges
    );

    if (!rangeData) {
      return;
    }

    result.warnings.forEach(warning => {
      const rule /*: string*/ = warning.rule;

      const ruleRanges /*: Array<Object>*/ = rangeData[rule];

      if (ruleRanges) {
        // Back to front so we get the *last* range that applies to the warning
        for (const range of ruleRanges.reverse()) {
          if (isWarningInRange(warning, range)) {
            range.used = true;

            return;
          }
        }
      }

      for (const range of rangeData.all.reverse()) {
        if (isWarningInRange(warning, range)) {
          range.used = true;

          return;
        }
      }
    });

    Object.keys(rangeData).forEach(rule => {
      rangeData[rule].forEach((range /*: rangeType*/) => {
        // Is an equivalent range already marked as unused?
        const alreadyMarkedUnused /*: ?unusedRangeT*/ = unused.ranges.find((
          unusedRange /*: unusedRangeT*/
        ) => {
          return (
            unusedRange.start === range.start && unusedRange.end === range.end
          );
        });

        // If this range is unused and no equivalent is marked,
        // mark this range as unused
        if (!range.used && !alreadyMarkedUnused) {
          range.unusedRule = rule;
          unused.ranges.push(range);
        }

        // If this range is used but an equivalent has been marked as unused,
        // remove that equivalent. This can happen because of the duplication
        // of ranges in rule-specific range sets and the "all" range set
        if (range.used && alreadyMarkedUnused) {
          _.remove(unused.ranges, alreadyMarkedUnused);
        }
      });
    });

    unused.ranges = _.sortBy(unused.ranges, ["start", "end"]);

    report.push(unused);
  });

  return report;
};

function isWarningInRange(
  warning /*: {
    column: number,
    rule: string,
    line: number,
    severity: string,
    text: string,
  }*/,
  range /*: {
    rules?: Array<string>,
    start: number,
    end?: number,
    used?: boolean,
  }*/
) /*: boolean*/ {
  const rule = warning.rule;
  const line = warning.line;

  // Need to check if range.end exist, because line number type cannot be compared to undefined
  return (
    range.start <= line &&
    ((range.end !== undefined && range.end >= line) ||
      range.end === undefined) &&
    (!range.rules || range.rules.indexOf(rule) !== -1)
  );
}