/*istanbul ignore start*/
"use strict";

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

/*istanbul ignore end*/
function parsePatch(uniDiff) {
  /*istanbul ignore start*/
  var
  /*istanbul ignore end*/
  options = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : {};
  var diffstr = uniDiff.split(/\r\n|[\n\v\f\r\x85]/),
      delimiters = uniDiff.match(/\r\n|[\n\v\f\r\x85]/g) || [],
      list = [],
      i = 0;

  function parseIndex() {
    var index = {};
    list.push(index); // Parse diff metadata

    while (i < diffstr.length) {
      var line = diffstr[i]; // File header found, end parsing diff metadata

      if (/^(\-\-\-|\+\+\+|@@)\s/.test(line)) {
        break;
      } // Diff index


      var header = /^(?:Index:|diff(?: -r \w+)+)\s+(.+?)\s*$/.exec(line);

      if (header) {
        index.index = header[1];
      }

      i++;
    } // Parse file headers if they are defined. Unified diff requires them, but
    // there's no technical issues to have an isolated hunk without file header


    parseFileHeader(index);
    parseFileHeader(index); // Parse hunks

    index.hunks = [];

    while (i < diffstr.length) {
      var _line = diffstr[i];

      if (/^(Index:|diff|\-\-\-|\+\+\+)\s/.test(_line)) {
        break;
      } else if (/^@@/.test(_line)) {
        index.hunks.push(parseHunk());
      } else if (_line && options.strict) {
        // Ignore unexpected content unless in strict mode
        throw new Error('Unknown line ' + (i + 1) + ' ' + JSON.stringify(_line));
      } else {
        i++;
      }
    }
  } // Parses the --- and +++ headers, if none are found, no lines
  // are consumed.


  function parseFileHeader(index) {
    var fileHeader = /^(---|\+\+\+)\s+(.*)$/.exec(diffstr[i]);

    if (fileHeader) {
      var keyPrefix = fileHeader[1] === '---' ? 'old' : 'new';
      var data = fileHeader[2].split('\t', 2);
      var fileName = data[0].replace(/\\\\/g, '\\');

      if (/^".*"$/.test(fileName)) {
        fileName = fileName.substr(1, fileName.length - 2);
      }

      index[keyPrefix + 'FileName'] = fileName;
      index[keyPrefix + 'Header'] = (data[1] || '').trim();
      i++;
    }
  } // Parses a hunk
  // This assumes that we are at the start of a hunk.


  function parseHunk() {
    var chunkHeaderIndex = i,
        chunkHeaderLine = diffstr[i++],
        chunkHeader = chunkHeaderLine.split(/@@ -(\d+)(?:,(\d+))? \+(\d+)(?:,(\d+))? @@/);
    var hunk = {
      oldStart: +chunkHeader[1],
      oldLines: typeof chunkHeader[2] === 'undefined' ? 1 : +chunkHeader[2],
      newStart: +chunkHeader[3],
      newLines: typeof chunkHeader[4] === 'undefined' ? 1 : +chunkHeader[4],
      lines: [],
      linedelimiters: []
    }; // Unified Diff Format quirk: If the chunk size is 0,
    // the first number is one lower than one would expect.
    // https://www.artima.com/weblogs/viewpost.jsp?thread=164293

    if (hunk.oldLines === 0) {
      hunk.oldStart += 1;
    }

    if (hunk.newLines === 0) {
      hunk.newStart += 1;
    }

    var addCount = 0,
        removeCount = 0;

    for (; i < diffstr.length; i++) {
      // Lines starting with '---' could be mistaken for the "remove line" operation
      // But they could be the header for the next file. Therefore prune such cases out.
      if (diffstr[i].indexOf('--- ') === 0 && i + 2 < diffstr.length && diffstr[i + 1].indexOf('+++ ') === 0 && diffstr[i + 2].indexOf('@@') === 0) {
        break;
      }

      var operation = diffstr[i].length == 0 && i != diffstr.length - 1 ? ' ' : diffstr[i][0];

      if (operation === '+' || operation === '-' || operation === ' ' || operation === '\\') {
        hunk.lines.push(diffstr[i]);
        hunk.linedelimiters.push(delimiters[i] || '\n');

        if (operation === '+') {
          addCount++;
        } else if (operation === '-') {
          removeCount++;
        } else if (operation === ' ') {
          addCount++;
          removeCount++;
        }
      } else {
        break;
      }
    } // Handle the empty block count case


    if (!addCount && hunk.newLines === 1) {
      hunk.newLines = 0;
    }

    if (!removeCount && hunk.oldLines === 1) {
      hunk.oldLines = 0;
    } // Perform optional sanity checking


    if (options.strict) {
      if (addCount !== hunk.newLines) {
        throw new Error('Added line count did not match for hunk at line ' + (chunkHeaderIndex + 1));
      }

      if (removeCount !== hunk.oldLines) {
        throw new Error('Removed line count did not match for hunk at line ' + (chunkHeaderIndex + 1));
      }
    }

    return hunk;
  }

  while (i < diffstr.length) {
    parseIndex();
  }

  return list;
}
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