requireJAR('diffutils-1.3.0.jar');

var DiffUtils = Packages.difflib.DiffUtils;
var DeleteDelta = Packages.difflib.DeleteDelta;
var ChangeDelta = Packages.difflib.ChangeDelta;
var InsertDelta = Packages.difflib.InsertDelta;

exports.diff2List = (left, right) => {
    var patch = DiffUtils.diff(left, right);
    var result = [];
    $EACH(patch.getDeltas(), (delta) => {
        if (delta instanceof DeleteDelta) {
            result.push("@@deleted @" + delta.getOriginal().getPosition()
                                + " #" + delta.getOriginal().getLines().size());
            $EACH(delta.getOriginal().getLines(), (line) => {
                result.push("-- " + line);
            })
        }
        if (delta instanceof ChangeDelta) {
            result.push("@@modified @" + delta.getOriginal().getPosition()
                                + " #" + delta.getOriginal().getLines().size() + '-' +  delta.getRevised().getLines().size());
            $EACH(delta.getOriginal().getLines(), (line) => {
                result.push("-- " + line);
            });
            $EACH(delta.getRevised().getLines(), (line) => {
                result.push("++ " + line);
            });
        }
        if (delta instanceof InsertDelta) {
            result.push("@@inserted @" + delta.getOriginal().getPosition()
                                + " #" + delta.getRevised().getLines().size());
            $EACH(delta.getRevised().getLines(), (line) => {
                result.push("++ " + line);
            });
        }
    });
    return result;
};