/***********************************************************************
  Copyright 2014      (c) Saair Quaderi <saair.quaderi@gmail.com>
  Copyright 2012-2013 (c) Mihai Bazon <mihai.bazon@gmail.com>

  UglyflyJS sourcecode can be found here:
    https://github.com/quaderi/uglyflyjs

  UglyflyJS (by Saair) is a fork of UglifyJS2 (by Mihai Bazon)
  Both libraries are released under the BSD 2-Clause License.
 ***********************************************************************/

/*globals define, module, require */

((typeof define === "function") ? define :
        function () { "use strict"; require('./nd').apply(module, arguments); })(
    "SourceMap",
    [
        "defaults"
    ],
    function (defaults) {
        "use strict";

        // a small wrapper around fitzgen's source-map library
        function SourceMap(MOZ_SourceMap, options) {
            var orig_map,
                generator;
            options = defaults(options, {
                file: null,
                root: null,
                orig: null,
                orig_line_diff: 0,
                dest_line_diff: 0
            });
            orig_map = options.orig && new MOZ_SourceMap.SourceMapConsumer(options.orig);
            if (orig_map) {
                generator = MOZ_SourceMap.SourceMapGenerator.fromSourceMap(orig_map);
            } else {
                generator = new MOZ_SourceMap.SourceMapGenerator({
                    file: options.file,
                    sourceRoot: options.root
                });
            }
            function add(source, gen_line, gen_col, orig_line, orig_col, name) {
                var info;
                if (orig_map) {
                    info = orig_map.originalPositionFor({
                        line: orig_line,
                        column: orig_col
                    });
                    if (info.source === null) {
                        return;
                    }
                    source = info.source;
                    orig_line = info.line;
                    orig_col = info.column;
                    name = info.name || name;
                }
                generator.addMapping({
                    generated: {
                        line: gen_line + options.dest_line_diff,
                        column: gen_col
                    },
                    original: {
                        line: orig_line + options.orig_line_diff,
                        column: orig_col
                    },
                    source: source,
                    name: name
                });
            }
            return {
                add: add,
                get: function () {
                    return generator;
                },
                toString: function () {
                    return JSON.stringify(generator.toJSON());
                }
            };
        }

        return SourceMap;
    }
);