// Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

import 'package:source_maps/source_maps.dart';
import 'package:source_span/source_span.dart';
import 'package:stack_trace/stack_trace.dart';
import 'package:source_map_stack_trace/source_map_stack_trace.dart';
import 'package:test/test.dart';

/// A simple [Mapping] for tests that don't need anything special.
final _simpleMapping = parseJson(
    (new SourceMapBuilder()
        ..addSpan(
            new SourceMapSpan.identifier(
                new SourceLocation(1,
                    line: 1, column: 3, sourceUrl: "foo.dart"),
                "qux"),
            new SourceSpan(
                new SourceLocation(8, line: 5, column: 0),
                new SourceLocation(18, line: 15, column: 0),
                "\n" * 10)))
        .build("foo.dart.js.map"));

void main() {
  test("maps a JS line and column to a Dart line and span", () {
    var trace = new Trace.parse("foo.dart.js 10:11  foo");
    var frame = mapStackTrace(_simpleMapping, trace).frames.first;
    expect(frame.uri, equals(Uri.parse("foo.dart")));

    // These are +1 because stack_trace is 1-based whereas source_span is
    // 0-basd.
    expect(frame.line, equals(2));
    expect(frame.column, equals(4));
  });

  test("ignores JS frames without line info", () {
    var trace = new Trace.parse("""
foo.dart.js 10:11  foo
foo.dart.js        bar
foo.dart.js 10:11  baz
""");
    var frames = mapStackTrace(_simpleMapping, trace).frames;

    expect(frames.length, equals(2));
    expect(frames.first.member, equals("foo"));
    expect(frames.last.member, equals("baz"));
  });

  test("ignores JS frames without corresponding spans", () {
    var trace = new Trace.parse("""
foo.dart.js 10:11  foo
foo.dart.js 1:1   bar
foo.dart.js 10:11  baz
""");

    var frames = mapStackTrace(_simpleMapping, trace).frames;

    expect(frames.length, equals(2));
    expect(frames.first.member, equals("foo"));
    expect(frames.last.member, equals("baz"));
  });

  test("falls back to column 0 for unlisted column", () {
    var trace = new Trace.parse("foo.dart.js 10  foo");
    var builder = new SourceMapBuilder()
        ..addSpan(
            new SourceMapSpan.identifier(
                new SourceLocation(1,
                    line: 1, column: 3, sourceUrl: "foo.dart"),
                "qux"),
            new SourceSpan(
                new SourceLocation(8, line: 5, column: 0),
                new SourceLocation(12, line: 9, column: 1),
                "\n" * 4));

    var mapping = parseJson(builder.build("foo.dart.js.map"));
    var frame = mapStackTrace(mapping, trace).frames.first;
    expect(frame.uri, equals(Uri.parse("foo.dart")));
    expect(frame.line, equals(2));
    expect(frame.column, equals(4));
  });

  test("uses package: URIs for frames within packageRoot", () {
    var trace = new Trace.parse("foo.dart.js 10  foo");
    var builder = new SourceMapBuilder()
        ..addSpan(
            new SourceMapSpan.identifier(
                new SourceLocation(1,
                    line: 1, column: 3, sourceUrl: "packages/foo/foo.dart"),
                "qux"),
            new SourceSpan(
                new SourceLocation(8, line: 5, column: 0),
                new SourceLocation(12, line: 9, column: 1),
                "\n" * 4));

    var mapping = parseJson(builder.build("foo.dart.js.map"));
    var frame = mapStackTrace(mapping, trace, packageRoot: "packages/")
        .frames.first;
    expect(frame.uri, equals(Uri.parse("package:foo/foo.dart")));
    expect(frame.line, equals(2));
    expect(frame.column, equals(4));
  });

  test("uses dart: URIs for frames within sdkRoot", () {
    var trace = new Trace.parse("foo.dart.js 10  foo");
    var builder = new SourceMapBuilder()
        ..addSpan(
            new SourceMapSpan.identifier(
                new SourceLocation(1,
                    line: 1, column: 3, sourceUrl: "sdk/lib/async/foo.dart"),
                "qux"),
            new SourceSpan(
                new SourceLocation(8, line: 5, column: 0),
                new SourceLocation(12, line: 9, column: 1),
                "\n" * 4));

    var mapping = parseJson(builder.build("foo.dart.js.map"));
    var frame = mapStackTrace(mapping, trace, sdkRoot: "sdk/").frames.first;
    expect(frame.uri, equals(Uri.parse("dart:async/foo.dart")));
    expect(frame.line, equals(2));
    expect(frame.column, equals(4));
  });

  test("converts a stack chain", () {
    var trace = new Chain([
      new Trace.parse("foo.dart.js 10:11  foo"),
      new Trace.parse("foo.dart.js 10:11  bar")
    ]);
    var traces = mapStackTrace(_simpleMapping, trace).traces;

    var frame = traces.first.frames.single;
    expect(frame.uri, equals(Uri.parse("foo.dart")));
    expect(frame.member, equals("foo"));
    expect(frame.line, equals(2));
    expect(frame.column, equals(4));

    frame = traces.last.frames.single;
    expect(frame.uri, equals(Uri.parse("foo.dart")));
    expect(frame.member, equals("bar"));
    expect(frame.line, equals(2));
    expect(frame.column, equals(4));
  });

  group("cleans up", () {
    test("Firefox junk", () {
      expect(_prettify("foo/<"), equals("foo"));
      expect(_prettify("foo<"), equals("foo"));
    });

    test("arity indicators", () {
      expect(_prettify(r"foo$1"), equals("foo"));
      expect(_prettify(r"foo$1234"), equals("foo"));
    });

    test("closures", () {
      expect(_prettify("foo_closure.call"), equals("foo.<fn>"));
    });

    test("nested closures", () {
      expect(_prettify("foo__closure.call"), equals("foo.<fn>.<fn>"));
      expect(_prettify("foo____closure.call"),
          equals("foo.<fn>.<fn>.<fn>.<fn>"));
    });

    test(".call", () {
      expect(_prettify("foo.call"), equals("foo"));
    });

    test("top-level functions", () {
      expect(_prettify("dart.foo"), equals("foo"));
    });

    test("library namespaces", () {
      expect(_prettify(r"my_library$foo"), equals("foo"));
    });

    test("static methods", () {
      expect(_prettify(r"Foo.static.foo"), equals("foo"));
    });

    test("instance methods", () {
      expect(_prettify(r"Foo_bar__baz"), equals("Foo.bar._baz"));
    });

    test("lots of stuff", () {
      expect(_prettify(r"lib$Foo.static.lib$Foo_closure.call$0/<"),
          equals("Foo.<fn>"));
    });
  });
}

/// Runs the mapper's prettification logic on [member] and returns the result.
String _prettify(String member) {
  var trace = new Trace([new Frame(Uri.parse("foo.dart.js"), 10, 11, member)]);
  return mapStackTrace(_simpleMapping, trace).frames.first.member;
}