// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0

#include <qmljs/parser/qmljsast_p.h>
#include <qmljs/parser/qmljsastvisitor_p.h>
#include <qmljs/parser/qmljsengine_p.h>
#include <qmljs/qmljsdocument.h>
#include <qmljs/qmljsmodelmanagerinterface.h>

#include <utils/filepath.h>

#include <QFile>
#include <QList>
#include <QCoreApplication>
#include <QStringList>
#include <QFileInfo>
#include <QTime>
#include <QDebug>

#include <cstdio>
#include <cstdlib>
#include <fstream>
#include <iostream>
#include <string>
#ifdef __GNUC__
#  include <cxxabi.h>
#endif

using namespace QmlJS;
using namespace QmlJS::AST;
using namespace std;

class ASTDump: protected Visitor
{
public:
    void operator()(const QString &fileName, const QByteArray &src, Node *ast) {
        _src = src;
        QString basename = fileName;
        int dotIdx = basename.lastIndexOf(QLatin1Char('.'));
        if (dotIdx != -1)
            basename.truncate(dotIdx);
        basename.append(QLatin1String(".ast.dot"));
        out.open(basename.toUtf8().constData());

        out << "digraph AST { ordering=out;" << endl;
        // cout << "rankdir = \"LR\";" << endl;
        Node::accept(ast, this);

        typedef QPair<QByteArray, QByteArray> Pair;

        for (const Pair &conn : std::as_const(_connections))
            out << conn.first.constData() << " -> " << conn.second.constData() << endl;

        alignTerminals();

        out << "}" << endl;
        out.close();
        cout << qPrintable(basename) << endl;
    }

protected:
    void alignTerminals() {
        out<<"{ rank=same;" << endl;
        for (const QByteArray &terminalShape : std::as_const(_terminalShapes)) {
            out << "  " << string(terminalShape.constData(), terminalShape.size()).c_str() << ";" << endl;
        }
        out<<"}"<<endl;
    }

    static QByteArray name(Node *ast) {
#ifdef __GNUC__
        QByteArray name = abi::__cxa_demangle(typeid(*ast).name(), 0, 0, 0) + 12;
#else
        QByteArray name = typeid(*ast).name();
#endif
        return name;
    }

    QString spell(const SourceLocation &token) {
        return QString::fromLatin1(_src.mid(token.offset, token.length).replace('\'', "\\\\").replace('"', "\\\""));
    }

    void terminal(const SourceLocation &token) {
        if (!token.isValid())
            return;

        static int count = 1;
        QByteArray id = 't' + QByteArray::number(count++);
        Node *node = _stack.last();
        _connections.append(qMakePair(_id[node], id));

        QByteArray t;
        t.append(id);
        t.append(" [label = \"");
        t.append(spell(token).toUtf8());
        t.append("\" shape=rect]");
        _terminalShapes.append(t);
    }

    virtual void nonterminal(Node *ast) {
        Node::accept(ast, this);
    }

    virtual void node(Node *ast) {
        out << _id[ast].constData() << " [label=\"" << name(ast).constData() << "\"];" << endl;
    }

    virtual bool preVisit(Node *ast) {
        static int count = 1;
        const QByteArray id = 'n' + QByteArray::number(count++);
        _id[ast] = id;


        if (! _stack.isEmpty())
            _connections.append(qMakePair(_id[_stack.last()], id));

        _stack.append(ast);

        node(ast);

        return true;
    }

    virtual void postVisit(Node *) {
        _stack.removeLast();
    }

protected: // visiting functions:
    virtual bool visit(UiImport *ast) {
        terminal(ast->importToken);

        if (ast->importUri)
            nonterminal(ast->importUri);
        else
            terminal(ast->fileNameToken);

        terminal(ast->version->firstSourceLocation());
        terminal(ast->asToken);
        terminal(ast->importIdToken);
        terminal(ast->semicolonToken);
        return false;
    }

    virtual bool visit(UiObjectBinding *ast) {
        if (ast->hasOnToken) {
            nonterminal(ast->qualifiedTypeNameId);
            terminal(ast->colonToken);
            nonterminal(ast->qualifiedId);
        } else {
            nonterminal(ast->qualifiedId);
            terminal(ast->colonToken);
            nonterminal(ast->qualifiedTypeNameId);
        }
        nonterminal(ast->initializer);
        return false;
    }

    virtual bool visit(UiObjectDefinition *ast) {
        nonterminal(ast->qualifiedTypeNameId);
        nonterminal(ast->initializer);
        return false;
    }

    virtual bool visit(UiObjectInitializer *ast) {
        terminal(ast->lbraceToken);
        nonterminal(ast->members);
        terminal(ast->rbraceToken);
        return false;
    }

    virtual bool visit(UiScriptBinding *ast) {
        nonterminal(ast->qualifiedId);
        terminal(ast->colonToken);
        nonterminal(ast->statement);
        return false;
    }

    virtual bool visit(UiArrayBinding *ast) {
        nonterminal(ast->qualifiedId);
        terminal(ast->colonToken);
        terminal(ast->lbracketToken);
        nonterminal(ast->members);
        terminal(ast->rbracketToken);
        return false;
    }

    virtual bool visit(UiArrayMemberList *ast) {
        terminal(ast->commaToken);
        nonterminal(ast->member);
        nonterminal(ast->next);
        return false;
    }

    virtual bool visit(UiQualifiedId *ast) {
        terminal(ast->identifierToken);
        nonterminal(ast->next);
        return false;
    }

    virtual bool visit(UiPublicMember *ast) {
        // TODO: place the parameters...
//        UiParameterList *parameters;

        terminal(ast->defaultToken());
        terminal(ast->readonlyToken());
        terminal(ast->propertyToken());
        terminal(ast->typeModifierToken);
        terminal(ast->typeToken);
        terminal(ast->identifierToken);
        terminal(ast->colonToken);
        nonterminal(ast->statement);
        nonterminal(ast->binding);
        terminal(ast->semicolonToken);
        return false;
    }

    virtual bool visit(StringLiteral *ast) { terminal(ast->literalToken); return false; }
    virtual bool visit(NumericLiteral *ast) { terminal(ast->literalToken); return false; }
    virtual bool visit(TrueLiteral *ast) { terminal(ast->trueToken); return false; }
    virtual bool visit(FalseLiteral *ast) { terminal(ast->falseToken); return false; }
    virtual bool visit(IdentifierExpression *ast) { terminal(ast->identifierToken); return false; }
    virtual bool visit(FieldMemberExpression *ast) { nonterminal(ast->base); terminal(ast->dotToken); terminal(ast->identifierToken); return false; }
    virtual bool visit(BinaryExpression *ast) { nonterminal(ast->left); terminal(ast->operatorToken); nonterminal(ast->right); return false; }
    virtual bool visit(UnaryPlusExpression *ast) { terminal(ast->plusToken); nonterminal(ast->expression); return false; }
    virtual bool visit(UnaryMinusExpression *ast) { terminal(ast->minusToken); nonterminal(ast->expression); return false; }
    virtual bool visit(NestedExpression *ast) { terminal(ast->lparenToken); nonterminal(ast->expression); terminal(ast->rparenToken); return false; }
    virtual bool visit(ThisExpression *ast) { terminal(ast->thisToken); return false; }
    virtual bool visit(NullExpression *ast) { terminal(ast->nullToken); return false; }
    virtual bool visit(RegExpLiteral *ast) { terminal(ast->literalToken); return false; }
    virtual bool visit(ArrayPattern *ast) { terminal(ast->lbracketToken); nonterminal(ast->elements); terminal(ast->commaToken); terminal(ast->rbracketToken); return false; }
    virtual bool visit(ObjectPattern *ast) { terminal(ast->lbraceToken); nonterminal(ast->properties); terminal(ast->rbraceToken); return false; }
    virtual bool visit(PatternElementList *ast) { nonterminal(ast->next); nonterminal(ast->elision); nonterminal(ast->element->initializer); return false; }
    virtual bool visit(Elision *ast) { nonterminal(ast->next); terminal(ast->commaToken); return false; }
    virtual bool visit(PatternPropertyList *ast) { nonterminal(AST::cast<AST::PatternProperty *>(ast->property)); nonterminal(ast->next); return false; }
    virtual bool visit(IdentifierPropertyName *ast) { terminal(ast->propertyNameToken); return false; }
    virtual bool visit(StringLiteralPropertyName *ast) { terminal(ast->propertyNameToken); return false; }
    virtual bool visit(NumericLiteralPropertyName *ast) { terminal(ast->propertyNameToken); return false; }
    virtual bool visit(ArrayMemberExpression *ast) { nonterminal(ast->base); terminal(ast->lbracketToken); nonterminal(ast->expression); terminal(ast->rbracketToken); return false; }
    virtual bool visit(NewMemberExpression *ast) { terminal(ast->newToken); nonterminal(ast->base); terminal(ast->lparenToken); nonterminal(ast->arguments); terminal(ast->rparenToken); return false; }
    virtual bool visit(NewExpression *ast) { terminal(ast->newToken); nonterminal(ast->expression); return false; }
    virtual bool visit(CallExpression *ast) { nonterminal(ast->base); terminal(ast->lparenToken); nonterminal(ast->arguments); terminal(ast->rparenToken); return false; }
    virtual bool visit(ArgumentList *ast) { nonterminal(ast->expression); terminal(ast->commaToken); nonterminal(ast->next); return false; }
    virtual bool visit(PostIncrementExpression *ast) { nonterminal(ast->base); terminal(ast->incrementToken); return false; }
    virtual bool visit(PostDecrementExpression *ast) { nonterminal(ast->base); terminal(ast->decrementToken); return false; }
    virtual bool visit(DeleteExpression *ast) { terminal(ast->deleteToken); nonterminal(ast->expression); return false; }
    virtual bool visit(VoidExpression *ast) { terminal(ast->voidToken); nonterminal(ast->expression); return false; }
    virtual bool visit(TypeOfExpression *ast) { terminal(ast->typeofToken); nonterminal(ast->expression); return false; }
    virtual bool visit(PreIncrementExpression *ast) { terminal(ast->incrementToken); nonterminal(ast->expression); return false; }
    virtual bool visit(PreDecrementExpression *ast) { terminal(ast->decrementToken); nonterminal(ast->expression); return false; }
    virtual bool visit(TildeExpression *ast) { terminal(ast->tildeToken); nonterminal(ast->expression); return false; }
    virtual bool visit(NotExpression *ast) { terminal(ast->notToken); nonterminal(ast->expression); return false; }
    virtual bool visit(ConditionalExpression *ast) { nonterminal(ast->expression); terminal(ast->questionToken); nonterminal(ast->ok); terminal(ast->colonToken); nonterminal(ast->ko); return false; }
    virtual bool visit(Expression *ast) { nonterminal(ast->left); terminal(ast->commaToken); nonterminal(ast->right); return false; }
    virtual bool visit(Block *ast) { terminal(ast->lbraceToken); nonterminal(ast->statements); terminal(ast->rbraceToken); return false; }
    virtual bool visit(VariableStatement *ast) { terminal(ast->declarationKindToken); nonterminal(ast->declarations); return false; }
    //virtual bool visit(VariableDeclaration *ast) { terminal(ast->identifierToken); nonterminal(ast->expression); return false; }
    virtual bool visit(VariableDeclarationList *ast) { nonterminal(ast->declaration); terminal(ast->commaToken); nonterminal(ast->next); return false; }
    virtual bool visit(EmptyStatement* ast) { terminal(ast->semicolonToken); return false; }
    virtual bool visit(ExpressionStatement *ast) { nonterminal(ast->expression); terminal(ast->semicolonToken); return false; }
    virtual bool visit(IfStatement *ast) { terminal(ast->ifToken); terminal(ast->lparenToken); nonterminal(ast->expression); terminal(ast->rparenToken); nonterminal(ast->ok); terminal(ast->elseToken); nonterminal(ast->ko); return false; }
    virtual bool visit(DoWhileStatement *ast) { terminal(ast->doToken); nonterminal(ast->statement); terminal(ast->whileToken); terminal(ast->lparenToken); nonterminal(ast->expression); terminal(ast->rparenToken); terminal(ast->semicolonToken); return false; }
    virtual bool visit(WhileStatement *ast) { terminal(ast->whileToken); terminal(ast->lparenToken); nonterminal(ast->expression); terminal(ast->rparenToken); nonterminal(ast->statement); return false; }
    virtual bool visit(ForStatement *ast) { terminal(ast->forToken); terminal(ast->lparenToken); nonterminal(ast->initialiser); terminal(ast->firstSemicolonToken); nonterminal(ast->condition); terminal(ast->secondSemicolonToken); nonterminal(ast->expression); terminal(ast->rparenToken); nonterminal(ast->statement); return false; }
    virtual bool visit(ForEachStatement *ast) { terminal(ast->forToken); terminal(ast->lparenToken); nonterminal(ast->expression); terminal(ast->rparenToken); nonterminal(ast->statement); return false; }
    virtual bool visit(ContinueStatement *ast) { terminal(ast->continueToken); return false; }
    virtual bool visit(BreakStatement *ast) { terminal(ast->breakToken); return false; }
    virtual bool visit(ReturnStatement *ast) { terminal(ast->returnToken); nonterminal(ast->expression); return false; }
    virtual bool visit(WithStatement *ast) { terminal(ast->withToken); terminal(ast->lparenToken); nonterminal(ast->expression); terminal(ast->rparenToken); nonterminal(ast->statement); return false; }
    virtual bool visit(CaseBlock *ast) { terminal(ast->lbraceToken); nonterminal(ast->clauses); nonterminal(ast->defaultClause); nonterminal(ast->moreClauses); terminal(ast->rbraceToken); return false; }
    virtual bool visit(SwitchStatement *ast) { terminal(ast->switchToken); terminal(ast->lparenToken); nonterminal(ast->expression); terminal(ast->rparenToken); nonterminal(ast->block); return false; }
    virtual bool visit(CaseClause *ast) { terminal(ast->caseToken); nonterminal(ast->expression); terminal(ast->colonToken); nonterminal(ast->statements); return false; }
    virtual bool visit(DefaultClause *ast) { terminal(ast->defaultToken); terminal(ast->colonToken); nonterminal(ast->statements); return false; }
    virtual bool visit(LabelledStatement *ast) { terminal(ast->identifierToken); terminal(ast->colonToken); nonterminal(ast->statement); return false; }
    virtual bool visit(ThrowStatement *ast) { terminal(ast->throwToken); nonterminal(ast->expression); return false; }
    virtual bool visit(Catch *ast) { terminal(ast->catchToken); terminal(ast->lparenToken); terminal(ast->identifierToken); terminal(ast->rparenToken); nonterminal(ast->statement); return false; }
    virtual bool visit(Finally *ast) { terminal(ast->finallyToken); nonterminal(ast->statement); return false; }
    virtual bool visit(FunctionExpression *ast) { terminal(ast->functionToken); terminal(ast->identifierToken); terminal(ast->lparenToken); nonterminal(ast->formals); terminal(ast->rparenToken); terminal(ast->lbraceToken); nonterminal(ast->body); terminal(ast->rbraceToken); return false; }
    virtual bool visit(FunctionDeclaration *ast) { return visit(static_cast<FunctionExpression *>(ast)); }
    virtual bool visit(DebuggerStatement *ast) { terminal(ast->debuggerToken); terminal(ast->semicolonToken); return false; }
    virtual bool visit(UiParameterList *ast) { terminal(ast->commaToken); terminal(ast->identifierToken); nonterminal(ast->next); return false; }

    void throwRecursionDepthError() override {
        qWarning() << "Reached maximum recursion depth.";
    }
private:
    QHash<Node *, QByteArray> _id;
    QList<QPair<QByteArray, QByteArray> > _connections;
    QList<Node *> _stack;
    QList<QByteArray> _terminalShapes;
    ofstream out;
    QByteArray _src;
};

int main(int argc, char *argv[])
{
    QCoreApplication app(argc, argv);

    QStringList files = app.arguments();
    files.removeFirst();

    for (const QString &fileName : std::as_const(files)) {
        QFile file(fileName);
        if (! file.open(QFile::ReadOnly)) {
            cerr << "Cannot open \"" << qPrintable(fileName)
                      << "\", skipping it." << endl;
            continue;
        }

        const QByteArray source = file.readAll();
        file.close();

        const Utils::FilePath filePath = Utils::FilePath::fromUserInput(fileName);
        Document::MutablePtr doc = Document::create(filePath, ModelManagerInterface::guessLanguageOfFile(filePath));
        doc->setSource(QString::fromUtf8(source));
        doc->parse();

        const QList<DiagnosticMessage> messages = doc->diagnosticMessages();
        for (const DiagnosticMessage &m : messages) {
            ostream *os;
            if (m.isError()) {
                os = &cerr;
                *os << "Error:";
            } else {
                os = &cout;
                *os << "Warning:";
            }

            if (m.loc.isValid())
                *os << m.loc.startLine << ':' << m.loc.startColumn << ':';
            *os << ' ';
            *os << qPrintable(m.message) << endl;
        }

        ASTDump dump;
        dump(fileName, source, doc->ast());
    }

    return EXIT_SUCCESS;
}