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#include "cppinsertdecldef.h"

#include <AST.h>
#include <ASTVisitor.h>
#include <CoreTypes.h>
#include <Names.h>
#include <Symbols.h>
#include <TranslationUnit.h>
#include <cplusplus/ASTPath.h>
#include <cplusplus/CppRewriter.h>
#include <cplusplus/LookupContext.h>
#include <cplusplus/Overview.h>
#include <cpptools/insertionpointlocator.h>

#include <QtCore/QCoreApplication>

using namespace CPlusPlus;
using namespace CppEditor;
using namespace CppEditor::Internal;
using namespace CppTools;

namespace {

class InsertDeclOperation: public CppQuickFixOperation
{
public:
    InsertDeclOperation(const CppQuickFixState &state, int priority,
                        const QString &targetFileName, const Class *targetSymbol,
                        InsertionPointLocator::AccessSpec xsSpec,
                        const QString &decl)
        : CppQuickFixOperation(state, priority)
        , m_targetFileName(targetFileName)
        , m_targetSymbol(targetSymbol)
        , m_xsSpec(xsSpec)
        , m_decl(decl)
    {
        QString type;
        switch (xsSpec) {
        case InsertionPointLocator::Public: type = QLatin1String("public"); break;
        case InsertionPointLocator::Protected: type = QLatin1String("protected"); break;
        case InsertionPointLocator::Private: type = QLatin1String("private"); break;
        case InsertionPointLocator::PublicSlot: type = QLatin1String("public slot"); break;
        case InsertionPointLocator::ProtectedSlot: type = QLatin1String("protected slot"); break;
        case InsertionPointLocator::PrivateSlot: type = QLatin1String("private slot"); break;
        default: break;
        }

        setDescription(QCoreApplication::translate("CppEditor::InsertDeclOperation",
                                                   "Add %1 declaration").arg(type));
    }

    void performChanges(CppRefactoringFile *, CppRefactoringChanges *refactoring)
    {
        InsertionPointLocator locator(refactoring);
        const InsertionLocation loc = locator.methodDeclarationInClass(
                    m_targetFileName, m_targetSymbol, m_xsSpec);
        Q_ASSERT(loc.isValid());

        CppRefactoringFile targetFile = refactoring->file(m_targetFileName);
        int targetPosition1 = targetFile.position(loc.line(), loc.column());
        int targetPosition2 = qMax(0, targetFile.position(loc.line(), 1) - 1);

        Utils::ChangeSet target;
        target.insert(targetPosition1, loc.prefix() + m_decl);
        targetFile.change(target);
        targetFile.indent(Utils::ChangeSet::Range(targetPosition2, targetPosition1));

        const int prefixLineCount = loc.prefix().count(QLatin1Char('\n'));
        refactoring->activateEditor(m_targetFileName, loc.line() + prefixLineCount,
                                    qMax(((int) loc.column()) - 1, 0));
    }

private:
    QString m_targetFileName;
    const Class *m_targetSymbol;
    InsertionPointLocator::AccessSpec m_xsSpec;
    QString m_decl;
};

} // anonymous namespace

QList<CppQuickFixOperation::Ptr> DeclFromDef::match(const CppQuickFixState &state)
{
    const QList<AST *> &path = state.path();
    const CppRefactoringFile &file = state.currentFile();

    FunctionDefinitionAST *funDef = 0;
    int idx = 0;
    for (; idx < path.size(); ++idx) {
        AST *node = path.at(idx);
        if (idx > 1) {
            if (DeclaratorIdAST *declId = node->asDeclaratorId()) {
                if (file.isCursorOn(declId)) {
                    if (FunctionDefinitionAST *candidate = path.at(idx - 2)->asFunctionDefinition()) {
                        if (funDef) {
                            return noResult();
                        } else {
                            funDef = candidate;
                            break;
                        }
                    }
                }
            }
        }

        if (node->asClassSpecifier()) {
            return noResult();
        }
    }

    if (!funDef || !funDef->symbol)
        return noResult();

    Function *method = funDef->symbol;

    if (ClassOrNamespace *targetBinding = state.context().lookupParent(method)) {
        foreach (Symbol *s, targetBinding->symbols()) {
            if (Class *clazz = s->asClass()) {
                QList<CppQuickFixOperation::Ptr> results;
                const QString fn = QString::fromUtf8(clazz->fileName(), clazz->fileNameLength());
                const QString decl = generateDeclaration(state,
                                                         method,
                                                         targetBinding);
                results.append(
                            singleResult(
                                new InsertDeclOperation(state, idx, fn, clazz,
                                                        InsertionPointLocator::Public,
                                                        decl)));
//                results.append(
//                            singleResult(
//                                new InsertDeclOperation(state, idx, fn, clazz,
//                                                        InsertionPointLocator::Protected,
//                                                        decl)));
//                results.append(
//                            singleResult(
//                                new InsertDeclOperation(state, idx, fn, clazz,
//                                                        InsertionPointLocator::Private,
//                                                        decl)));
//                results.append(
//                            singleResult(
//                                new InsertDeclOperation(state, idx, fn, clazz,
//                                                        InsertionPointLocator::PublicSlot,
//                                                        decl)));
//                results.append(
//                            singleResult(
//                                new InsertDeclOperation(state, idx, fn, clazz,
//                                                        InsertionPointLocator::ProtectedSlot,
//                                                        decl)));
//                results.append(
//                            singleResult(
//                                new InsertDeclOperation(state, idx, fn, clazz,
//                                                        InsertionPointLocator::PrivateSlot,
//                                                        decl)));
                return results;
            } //! \todo support insertion of non-methods into namespaces
        }
    }

    return noResult();
}

QString DeclFromDef::generateDeclaration(const CppQuickFixState &,
                                         Function *method,
                                         ClassOrNamespace *targetBinding)
{
    Q_UNUSED(targetBinding);

    Overview oo;
    oo.setShowFunctionSignatures(true);
    oo.setShowReturnTypes(true);
    oo.setShowArgumentNames(true);

    QString decl;
    decl += oo(method->type(), method->unqualifiedName());
    decl += QLatin1String(";\n");

    return decl;
}

namespace {

class InsertDefOperation: public CppQuickFixOperation
{
public:
    InsertDefOperation(const CppQuickFixState &state, int priority,
                       Declaration *decl, const InsertionLocation &loc)
        : CppQuickFixOperation(state, priority)
        , m_decl(decl)
        , m_loc(loc)
    {
        setDescription(QCoreApplication::translate("CppEditor::InsertDefOperation",
                                                   "Add definition in %1")
                       .arg(m_loc.fileName()));
    }

    void performChanges(CppRefactoringFile *,
                        CppRefactoringChanges *refactoring)
    {
        Q_ASSERT(m_loc.isValid());

        CppRefactoringFile targetFile = refactoring->file(m_loc.fileName());

        Overview oo;
        oo.setShowFunctionSignatures(true);
        oo.setShowReturnTypes(true);
        oo.setShowArgumentNames(true);

        //--
        SubstitutionEnvironment env;
        env.setContext(state().context());
        env.switchScope(m_decl->enclosingScope());
        UseQualifiedNames q;
        env.enter(&q);

        Control *control = state().context().control().data();
        FullySpecifiedType tn = rewriteType(m_decl->type(), &env, control);
        QString name = oo(LookupContext::fullyQualifiedName(m_decl));
        //--

        QString defText = oo.prettyType(tn, name) + "\n{\n}";

        int targetPos = targetFile.position(m_loc.line(), m_loc.column());
        int targetPos2 = qMax(0, targetFile.position(m_loc.line(), 1) - 1);

        Utils::ChangeSet target;
        target.insert(targetPos,  m_loc.prefix() + defText + m_loc.suffix());
        targetFile.change(target);
        targetFile.indent(Utils::ChangeSet::Range(targetPos2, targetPos));

        const int prefixLineCount = m_loc.prefix().count(QLatin1Char('\n'));
        refactoring->activateEditor(m_loc.fileName(),
                                    m_loc.line() + prefixLineCount,
                                    0);
    }

private:
    Declaration *m_decl;
    InsertionLocation m_loc;
};

} // anonymous namespace

QList<CppQuickFixOperation::Ptr> DefFromDecl::match(const CppQuickFixState &state)
{
    const QList<AST *> &path = state.path();
    const CppRefactoringFile &file = state.currentFile();

    int idx = path.size() - 1;
    for (; idx >= 0; --idx) {
        AST *node = path.at(idx);
        if (SimpleDeclarationAST *simpleDecl = node->asSimpleDeclaration()) {
            if (simpleDecl->symbols && ! simpleDecl->symbols->next) {
                if (Symbol *symbol = simpleDecl->symbols->value) {
                    if (Declaration *decl = symbol->asDeclaration()) {
                        if (decl->type()->isFunctionType() && decl->enclosingScope() && decl->enclosingScope()->isClass()) {
                            DeclaratorAST *declarator = simpleDecl->declarator_list->value;
                            if (file.isCursorOn(declarator->core_declarator)) {
                                CppRefactoringChanges refactoring(state.snapshot());
                                InsertionPointLocator locator(&refactoring);
                                QList<CppQuickFixOperation::Ptr> results;
                                foreach (const InsertionLocation &loc, locator.methodDefinition(decl)) {
                                    if (loc.isValid())
                                        results.append(CppQuickFixOperation::Ptr(new InsertDefOperation(state, idx, decl, loc)));
                                }
                                return results;
                            }
                        }
                    }
                }
            }

            break;
        }
    }

    return noResult();
}