// Copyright (c) 2012, 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.

library mock_compiler;

import 'dart:uri';

import '../../../lib/compiler/compiler.dart' as api;
import '../../../lib/compiler/implementation/dart2jslib.dart' hide TreeElementMapping;
import '../../../lib/compiler/implementation/elements/elements.dart';
import '../../../lib/compiler/implementation/resolution/resolution.dart';
import '../../../lib/compiler/implementation/source_file.dart';
import '../../../lib/compiler/implementation/tree/tree.dart';
import '../../../lib/compiler/implementation/util/util.dart';
import 'parser_helper.dart';

class WarningMessage {
  Node node;
  Message message;
  WarningMessage(this.node, this.message);

  toString() => message.toString();
}

const String DEFAULT_HELPERLIB = r'''
  lt() {} add(var a, var b) {} sub() {} mul() {} div() {} tdiv() {} mod() {}
  neg() {} shl() {} shr() {} eq() {} le() {} gt() {} ge() {}
  or() {} and() {} not() {} eqNull(a) {} eqq() {}
  ltB() {} leB() {} eqB() {} gtB() {} geB() {} eqNullB(a) {}
  $throw(x) { return x; }
  iae(x) { throw x; } ioore(x) { throw x; }
  guard$array(x) { return x; }
  guard$num(x) { return x; }
  guard$string(x) { return x; }
  guard$stringOrArray(x) { return x; }
  index(a, index) {}
  indexSet(a, index, value) {}
  makeLiteralMap(List keyValuePairs) {}
  setRuntimeTypeInfo(a, b) {}
  getRuntimeTypeInfo(a) {}
  stringTypeCheck(x) {}
  boolConversionCheck(x) {}
  abstract class JavaScriptIndexingBehavior {}
  class JSInvocationMirror {}
  S() {}
  assertHelper(a){}''';

const String DEFAULT_INTERCEPTORSLIB = r'''
  add$1(receiver, value) {}
  get$length(receiver) {}
  filter(receiver, predicate) {}
  removeLast(receiver) {}
  iterator(receiver) {}
  next(receiver) {}
  hasNext(receiver) {}''';

const String DEFAULT_CORELIB = r'''
  print(var obj) {}
  abstract class num {}
  abstract class int extends num { }
  abstract class double extends num { }
  class bool {}
  class String {}
  class Object {}
  class Function {}
  interface List default ListImplementation { List([length]);}
  class ListImplementation { factory List([length]) => null; }
  abstract class Map {}
  class Closure {}
  class Null {}
  class Dynamic_ {}
  bool identical(Object a, Object b) {}''';

class MockCompiler extends Compiler {
  List<WarningMessage> warnings;
  List<WarningMessage> errors;
  final Map<String, SourceFile> sourceFiles;
  Node parsedTree;

  MockCompiler({String coreSource: DEFAULT_CORELIB,
                String helperSource: DEFAULT_HELPERLIB,
                String interceptorsSource: DEFAULT_INTERCEPTORSLIB,
                bool enableTypeAssertions: false,
                bool enableMinification: false,
                bool enableConcreteTypeInference: false})
      : warnings = [], errors = [],
        sourceFiles = new Map<String, SourceFile>(),
        super(enableTypeAssertions: enableTypeAssertions,
              enableMinification: enableMinification,
              enableConcreteTypeInference: enableConcreteTypeInference) {
    coreLibrary = createLibrary("core", coreSource);
    // We need to set the assert method to avoid calls with a 'null'
    // target being interpreted as a call to assert.
    jsHelperLibrary = createLibrary("helper", helperSource);
    importHelperLibrary(coreLibrary);
    assertMethod = jsHelperLibrary.find(buildSourceString('assert'));
    interceptorsLibrary = createLibrary("interceptors", interceptorsSource);

    mainApp = mockLibrary(this, "");
    initializeSpecialClasses();
    // We need to make sure the Object class is resolved. When registering a
    // dynamic invocation the ArgumentTypesRegistry eventually iterates over
    // the interfaces of the Object class which would be 'null' if the class
    // wasn't resolved.
    objectClass.ensureResolved(this);
  }

  /**
   * Used internally to create a library from a source text. The created library
   * is fixed to export its top-level declarations.
   */
  LibraryElement createLibrary(String name, String source) {
    Uri uri = new Uri.fromComponents(scheme: "source", path: name);
    var script = new Script(uri, new MockFile(source));
    var library = new LibraryElement(script);
    parseScript(source, library);
    library.setExports(library.localScope.values);
    return library;
  }

  void reportWarning(Node node, var message) {
    warnings.add(new WarningMessage(node, message.message));
  }

  void reportError(Node node, var message) {
    if (message is String && message.startsWith("no library name found in")) {
      // TODO(ahe): Fix the MockCompiler to not have this problem.
      return;
    }
    errors.add(new WarningMessage(node, message.message));
  }

  void reportMessage(SourceSpan span, var message, api.Diagnostic kind) {
    var diagnostic = new WarningMessage(null, message.message);
    if (kind === api.Diagnostic.ERROR) {
      errors.add(diagnostic);
    } else {
      warnings.add(diagnostic);
    }
  }

  void reportDiagnostic(SourceSpan span, String message, var kind) {
    print(message);
  }

  bool get compilationFailed => !errors.isEmpty;

  void clearWarnings() {
    warnings = [];
  }

  void clearErrors() {
    errors = [];
  }

  TreeElementMapping resolveStatement(String text) {
    parsedTree = parseStatement(text);
    return resolveNodeStatement(parsedTree, mainApp);
  }

  TreeElementMapping resolveNodeStatement(Node tree, Element element) {
    ResolverVisitor visitor =
        new ResolverVisitor(this, element, new CollectingTreeElements(element));
    if (visitor.scope is LibraryScope) {
      visitor.scope = new MethodScope(visitor.scope, element);
    }
    visitor.visit(tree);
    visitor.scope = new LibraryScope(element.getLibrary());
    return visitor.mapping;
  }

  resolverVisitor() {
    Element mockElement =
        new Element(buildSourceString(''), ElementKind.FUNCTION, mainApp);
    ResolverVisitor visitor =
        new ResolverVisitor(this, mockElement,
                            new CollectingTreeElements(mockElement));
    visitor.scope = new MethodScope(visitor.scope, mockElement);
    return visitor;
  }

  parseScript(String text, [LibraryElement library]) {
    if (library === null) library = mainApp;
    parseUnit(text, this, library);
  }

  void scanBuiltinLibraries() {
    // Do nothing. The mock core library is already handled in the constructor.
  }

  LibraryElement scanBuiltinLibrary(String name) {
    // Do nothing. The mock core library is already handled in the constructor.
  }

  void importCoreLibrary(LibraryElement library) {
    scanner.importLibrary(library, coreLibrary, null);
  }

  // The mock library doesn't need any patches.
  Uri resolvePatchUri(String dartLibraryName) => null;

  Script readScript(Uri uri, [ScriptTag node]) {
    SourceFile sourceFile = sourceFiles[uri.toString()];
    if (sourceFile === null) throw new ArgumentError(uri);
    return new Script(uri, sourceFile);
  }
}

void compareWarningKinds(String text, expectedWarnings, foundWarnings) {
  var fail = (message) => Expect.fail('$text: $message');
  Iterator<MessageKind> expected = expectedWarnings.iterator();
  Iterator<WarningMessage> found = foundWarnings.iterator();
  while (expected.hasNext && found.hasNext) {
    Expect.equals(expected.next(), found.next().message.kind);
  }
  if (expected.hasNext) {
    do {
      print('Expected warning "${expected.next()}" did not occur');
    } while (expected.hasNext);
    fail('Too few warnings');
  }
  if (found.hasNext) {
    do {
      print('Additional warning "${found.next()}"');
    } while (found.hasNext);
    fail('Too many warnings');
  }
}

void importLibrary(LibraryElement target, LibraryElement imported,
                   Compiler compiler) {
  for (var element in imported.localMembers) {
    compiler.withCurrentElement(element, () {
      target.addToScope(element, compiler);
    });
  }
}

LibraryElement mockLibrary(Compiler compiler, String source) {
  Uri uri = new Uri.fromComponents(scheme: "source");
  var library = new LibraryElement(new Script(uri, new MockFile(source)));
  importLibrary(library, compiler.coreLibrary, compiler);
  return library;
}

class CollectingTreeElements extends TreeElementMapping {
  final Map<Node, Element> map = new LinkedHashMap<Node, Element>();

  CollectingTreeElements(Element currentElement) : super(currentElement);

  operator []=(Node node, Element element) {
    map[node] = element;
  }

  operator [](Node node) => map[node];

  void remove(Node node) {
    map.remove(node);
  }
}