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

exports.__esModule = true;
exports. /*istanbul ignore end*/structuredPatch = structuredPatch;
/*istanbul ignore start*/exports. /*istanbul ignore end*/createTwoFilesPatch = createTwoFilesPatch;
/*istanbul ignore start*/exports. /*istanbul ignore end*/createPatch = createPatch;

var /*istanbul ignore start*/_line = require('../diff/line') /*istanbul ignore end*/;

/*istanbul ignore start*/function _toConsumableArray(arr) { if (Array.isArray(arr)) { for (var i = 0, arr2 = Array(arr.length); i < arr.length; i++) { arr2[i] = arr[i]; } return arr2; } else { return Array.from(arr); } }

/*istanbul ignore end*/function structuredPatch(oldFileName, newFileName, oldStr, newStr, oldHeader, newHeader, options) {
  if (!options) {
    options = {};
  }
  if (typeof options.context === 'undefined') {
    options.context = 4;
  }

  var diff = /*istanbul ignore start*/(0, _line.diffLines) /*istanbul ignore end*/(oldStr, newStr, options);
  diff.push({ value: '', lines: [] }); // Append an empty value to make cleanup easier

  function contextLines(lines) {
    return lines.map(function (entry) {
      return ' ' + entry;
    });
  }

  var hunks = [];
  var oldRangeStart = 0,
      newRangeStart = 0,
      curRange = [],
      oldLine = 1,
      newLine = 1;

  /*istanbul ignore start*/var _loop = function _loop( /*istanbul ignore end*/i) {
    var current = diff[i],
        lines = current.lines || current.value.replace(/\n$/, '').split('\n');
    current.lines = lines;

    if (current.added || current.removed) {
      /*istanbul ignore start*/var _curRange;

      /*istanbul ignore end*/ // If we have previous context, start with that
      if (!oldRangeStart) {
        var prev = diff[i - 1];
        oldRangeStart = oldLine;
        newRangeStart = newLine;

        if (prev) {
          curRange = options.context > 0 ? contextLines(prev.lines.slice(-options.context)) : [];
          oldRangeStart -= curRange.length;
          newRangeStart -= curRange.length;
        }
      }

      // Output our changes
      /*istanbul ignore start*/(_curRange = /*istanbul ignore end*/curRange).push. /*istanbul ignore start*/apply /*istanbul ignore end*/( /*istanbul ignore start*/_curRange /*istanbul ignore end*/, /*istanbul ignore start*/_toConsumableArray( /*istanbul ignore end*/lines.map(function (entry) {
        return (current.added ? '+' : '-') + entry;
      })));

      // Track the updated file position
      if (current.added) {
        newLine += lines.length;
      } else {
        oldLine += lines.length;
      }
    } else {
      // Identical context lines. Track line changes
      if (oldRangeStart) {
        // Close out any changes that have been output (or join overlapping)
        if (lines.length <= options.context * 2 && i < diff.length - 2) {
          /*istanbul ignore start*/var _curRange2;

          /*istanbul ignore end*/ // Overlapping
          /*istanbul ignore start*/(_curRange2 = /*istanbul ignore end*/curRange).push. /*istanbul ignore start*/apply /*istanbul ignore end*/( /*istanbul ignore start*/_curRange2 /*istanbul ignore end*/, /*istanbul ignore start*/_toConsumableArray( /*istanbul ignore end*/contextLines(lines)));
        } else {
          /*istanbul ignore start*/var _curRange3;

          /*istanbul ignore end*/ // end the range and output
          var contextSize = Math.min(lines.length, options.context);
          /*istanbul ignore start*/(_curRange3 = /*istanbul ignore end*/curRange).push. /*istanbul ignore start*/apply /*istanbul ignore end*/( /*istanbul ignore start*/_curRange3 /*istanbul ignore end*/, /*istanbul ignore start*/_toConsumableArray( /*istanbul ignore end*/contextLines(lines.slice(0, contextSize))));

          var hunk = {
            oldStart: oldRangeStart,
            oldLines: oldLine - oldRangeStart + contextSize,
            newStart: newRangeStart,
            newLines: newLine - newRangeStart + contextSize,
            lines: curRange
          };
          if (i >= diff.length - 2 && lines.length <= options.context) {
            // EOF is inside this hunk
            var oldEOFNewline = /\n$/.test(oldStr);
            var newEOFNewline = /\n$/.test(newStr);
            if (lines.length == 0 && !oldEOFNewline) {
              // special case: old has no eol and no trailing context; no-nl can end up before adds
              curRange.splice(hunk.oldLines, 0, '\\ No newline at end of file');
            } else if (!oldEOFNewline || !newEOFNewline) {
              curRange.push('\\ No newline at end of file');
            }
          }
          hunks.push(hunk);

          oldRangeStart = 0;
          newRangeStart = 0;
          curRange = [];
        }
      }
      oldLine += lines.length;
      newLine += lines.length;
    }
  };

  for (var i = 0; i < diff.length; i++) {
    /*istanbul ignore start*/_loop( /*istanbul ignore end*/i);
  }

  return {
    oldFileName: oldFileName, newFileName: newFileName,
    oldHeader: oldHeader, newHeader: newHeader,
    hunks: hunks
  };
}

function createTwoFilesPatch(oldFileName, newFileName, oldStr, newStr, oldHeader, newHeader, options) {
  var diff = structuredPatch(oldFileName, newFileName, oldStr, newStr, oldHeader, newHeader, options);

  var ret = [];
  if (oldFileName == newFileName) {
    ret.push('Index: ' + oldFileName);
  }
  ret.push('===================================================================');
  ret.push('--- ' + diff.oldFileName + (typeof diff.oldHeader === 'undefined' ? '' : '\t' + diff.oldHeader));
  ret.push('+++ ' + diff.newFileName + (typeof diff.newHeader === 'undefined' ? '' : '\t' + diff.newHeader));

  for (var i = 0; i < diff.hunks.length; i++) {
    var hunk = diff.hunks[i];
    ret.push('@@ -' + hunk.oldStart + ',' + hunk.oldLines + ' +' + hunk.newStart + ',' + hunk.newLines + ' @@');
    ret.push.apply(ret, hunk.lines);
  }

  return ret.join('\n') + '\n';
}

function createPatch(fileName, oldStr, newStr, oldHeader, newHeader, options) {
  return createTwoFilesPatch(fileName, fileName, oldStr, newStr, oldHeader, newHeader, options);
}
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