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#include "parser/qmljsast_p.h"
#include "qmljsbind.h"
#include "qmljscheck.h"
#include "qmljsdocument.h"

#include <QtCore/QDir>
#include <QtCore/QFileInfo>
#include <QtCore/QDebug>

using namespace QmlJS;
using namespace QmlJS::AST;
using namespace QmlJS::Interpreter;

/*!
    \class QmlJS::Bind
    \brief Collected information about a single Document.
    \sa QmlJS::Document QmlJS::Link

    Each QmlJS::Document owns a instance of Bind. It provides access to data
    that can be derived by looking at the document in isolation. If you need
    information that goes beyond that, you need to create a
    \l{QmlJS::Interpreter::Context} using \l{QmlJS::Link}.

    The document's imports are classified and available through imports().

    It allows AST to code model lookup through findQmlObject() and findFunctionScope().
*/

Bind::Bind(Document *doc, QList<DiagnosticMessage> *messages)
    : _doc(doc),
      _currentObjectValue(0),
      _idEnvironment(0),
      _rootObjectValue(0),
      _diagnosticMessages(messages)
{
    if (_doc)
        accept(_doc->ast());
}

Bind::~Bind()
{
}

QList<ImportInfo> Bind::imports() const
{
    return _imports;
}

Interpreter::ObjectValue *Bind::idEnvironment() const
{
    return _idEnvironment;
}

Interpreter::ObjectValue *Bind::rootObjectValue() const
{
    return _rootObjectValue;
}

Interpreter::ObjectValue *Bind::findQmlObject(AST::Node *node) const
{
    return _qmlObjects.value(node);
}

bool Bind::usesQmlPrototype(ObjectValue *prototype,
                            const Context *context) const
{
    // ### This function is disabled for performance reasons.
    return false;

    foreach (ObjectValue *object, _qmlObjects.values()) {
        const ObjectValue *resolvedPrototype = object->prototype(context);

        if (resolvedPrototype == prototype)
            return true;
    }

    return false;
}

Interpreter::ObjectValue *Bind::findFunctionScope(AST::FunctionDeclaration *node) const
{
    return _functionScopes.value(node);
}

bool Bind::isGroupedPropertyBinding(AST::Node *node) const
{
    return _groupedPropertyBindings.contains(node);
}

ObjectValue *Bind::switchObjectValue(ObjectValue *newObjectValue)
{
    ObjectValue *oldObjectValue = _currentObjectValue;
    _currentObjectValue = newObjectValue;
    return oldObjectValue;
}

QString Bind::toString(UiQualifiedId *qualifiedId, QChar delimiter)
{
    QString result;

    for (UiQualifiedId *iter = qualifiedId; iter; iter = iter->next) {
        if (iter != qualifiedId)
            result += delimiter;

        if (iter->name)
            result += iter->name->asString();
    }

    return result;
}

ExpressionNode *Bind::expression(UiScriptBinding *ast) const
{
    if (ExpressionStatement *statement = cast<ExpressionStatement *>(ast->statement))
        return statement->expression;

    return 0;
}

ObjectValue *Bind::bindObject(UiQualifiedId *qualifiedTypeNameId, UiObjectInitializer *initializer)
{
    ObjectValue *parentObjectValue = 0;

    // normal component instance
    ASTObjectValue *objectValue = new ASTObjectValue(qualifiedTypeNameId, initializer, _doc, &_engine);
    QmlPrototypeReference *prototypeReference =
            new QmlPrototypeReference(qualifiedTypeNameId, _doc, &_engine);
    objectValue->setPrototype(prototypeReference);

    parentObjectValue = switchObjectValue(objectValue);

    if (parentObjectValue)
        objectValue->setProperty(QLatin1String("parent"), parentObjectValue);
    else {
        _rootObjectValue = objectValue;
        _rootObjectValue->setClassName(_doc->componentName());
    }

    accept(initializer);

    return switchObjectValue(parentObjectValue);
}

void Bind::accept(Node *node)
{
    Node::accept(node, this);
}

bool Bind::visit(AST::UiProgram *)
{
    _idEnvironment = _engine.newObject(/*prototype =*/ 0);
    return true;
}

bool Bind::visit(AST::Program *)
{
    _currentObjectValue = _engine.newObject(/*prototype =*/ 0);
    _rootObjectValue = _currentObjectValue;
    return true;
}

bool Bind::visit(UiImport *ast)
{
    ComponentVersion version;
    ImportInfo::Type type = ImportInfo::InvalidImport;
    QString name;

    if (ast->versionToken.isValid()) {
        const QString versionString = _doc->source().mid(ast->versionToken.offset, ast->versionToken.length);
        const int dotIdx = versionString.indexOf(QLatin1Char('.'));
        if (dotIdx != -1) {
            version = ComponentVersion(versionString.left(dotIdx).toInt(),
                                       versionString.mid(dotIdx + 1).toInt());
        } else {
            _diagnosticMessages->append(
                        errorMessage(ast->versionToken, tr("expected two numbers separated by a dot")));
        }
    }

    if (ast->importUri) {
        type = ImportInfo::LibraryImport;
        name = toString(ast->importUri, QDir::separator());

        if (!version.isValid()) {
            _diagnosticMessages->append(
                        errorMessage(ast, tr("package import requires a version number")));
        }
    } else if (ast->fileName) {
        const QFileInfo importFileInfo(_doc->path() + QDir::separator() + ast->fileName->asString());
        name = importFileInfo.absoluteFilePath();
        if (importFileInfo.isFile())
            type = ImportInfo::FileImport;
        else if (importFileInfo.isDir())
            type = ImportInfo::DirectoryImport;
        else {
            _diagnosticMessages->append(
                        errorMessage(ast, tr("file or directory not found")));
            type = ImportInfo::UnknownFileImport;
        }
    }
    _imports += ImportInfo(type, name, version, ast);

    return false;
}

bool Bind::visit(UiPublicMember *)
{
    // nothing to do.
    return true;
}

bool Bind::visit(UiObjectDefinition *ast)
{
    // an UiObjectDefinition may be used to group property bindings
    // think anchors { ... }
    bool isGroupedBinding = false;
    for (UiQualifiedId *it = ast->qualifiedTypeNameId; it; it = it->next) {
        if (!it->next && it->name)
            isGroupedBinding = it->name->asString().at(0).isLower();
    }

    if (!isGroupedBinding) {
        ObjectValue *value = bindObject(ast->qualifiedTypeNameId, ast->initializer);
        _qmlObjects.insert(ast, value);
    } else {
        _groupedPropertyBindings.insert(ast);
    }

    return false;
}

bool Bind::visit(UiObjectBinding *ast)
{
//    const QString name = serialize(ast->qualifiedId);
    ObjectValue *value = bindObject(ast->qualifiedTypeNameId, ast->initializer);
    _qmlObjects.insert(ast, value);
    // ### FIXME: we don't handle dot-properties correctly (i.e. font.size)
//    _currentObjectValue->setProperty(name, value);

    return false;
}

bool Bind::visit(UiScriptBinding *ast)
{
    if (toString(ast->qualifiedId) == QLatin1String("id")) {
        if (ExpressionStatement *e = cast<ExpressionStatement*>(ast->statement))
            if (IdentifierExpression *i = cast<IdentifierExpression*>(e->expression))
                if (i->name)
                    _idEnvironment->setProperty(i->name->asString(), _currentObjectValue);
    }

    return false;
}

bool Bind::visit(UiArrayBinding *)
{
    // ### FIXME: do we need to store the members into the property? Or, maybe the property type is an JS Array?

    return true;
}

bool Bind::visit(VariableDeclaration *ast)
{
    if (! ast->name)
        return false;

    ASTVariableReference *ref = new ASTVariableReference(ast, &_engine);
    _currentObjectValue->setProperty(ast->name->asString(), ref);
    return false;
}

bool Bind::visit(FunctionDeclaration *ast)
{
    if (!ast->name)
        return false;
    // ### FIXME: the first declaration counts
    //if (_currentObjectValue->property(ast->name->asString(), 0))
    //    return false;

    ASTFunctionValue *function = new ASTFunctionValue(ast, _doc, &_engine);
    _currentObjectValue->setProperty(ast->name->asString(), function);

    // build function scope
    ObjectValue *functionScope = _engine.newObject(/*prototype=*/0);
    _functionScopes.insert(ast, functionScope);
    ObjectValue *parent = switchObjectValue(functionScope);

    // The order of the following is important. Example: A function with name "arguments"
    // overrides the arguments object, a variable doesn't.

    // 1. Function formal arguments
    for (FormalParameterList *it = ast->formals; it; it = it->next) {
        if (it->name)
            functionScope->setProperty(it->name->asString(), _engine.undefinedValue());
    }

    // 2. Functions defined inside the function body
    // ### TODO, currently covered by the accept(body)

    // 3. Arguments object
    ObjectValue *arguments = _engine.newObject(/*prototype=*/0);
    arguments->setProperty(QLatin1String("callee"), function);
    arguments->setProperty(QLatin1String("length"), _engine.numberValue());
    functionScope->setProperty(QLatin1String("arguments"), arguments);

    // 4. Variables defined inside the function body
    // ### TODO, currently covered by the accept(body)

    // visit body
    accept(ast->body);
    switchObjectValue(parent);

    return false;
}