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#ifndef CPLUSPLUS_LOOKUPCONTEXT_H
#define CPLUSPLUS_LOOKUPCONTEXT_H

#include <SymbolVisitor.h>
#include <cplusplus/CppDocument.h>

#include <QList>
#include <QSet>
#include <QMap>

namespace CPlusPlus {

class CPLUSPLUS_EXPORT LookupUtils
{
public:
    static bool isNameCompatibleWithIdentifier(Name *name,
                                               Identifier *id);
};

class CPLUSPLUS_EXPORT LookupContext: LookupUtils
{
public:
    LookupContext(Control *control = 0);

    LookupContext(Symbol *symbol,
                  Document::Ptr expressionDocument,
                  Document::Ptr thisDocument,
                  const QMap<QString, Document::Ptr> &documents);

    LookupContext(Symbol *symbol,
                  const LookupContext &context);

    LookupContext(Symbol *symbol,
                  Document::Ptr thisDocument,
                  const LookupContext &context);

    bool isValid() const;
    operator bool() const;

    Control *control() const;
    Symbol *symbol() const;
    Document::Ptr expressionDocument() const;
    Document::Ptr thisDocument() const;
    Document::Ptr document(const QString &fileName) const;

    QList<Symbol *> resolve(Name *name) const
    { return resolve(name, visibleScopes()); }

    QList<Symbol *> resolveNamespace(Name *name) const
    { return resolveNamespace(name, visibleScopes()); }

    QList<Symbol *> resolveClass(Name *name) const
    { return resolveClass(name, visibleScopes()); }

    QList<Symbol *> resolveClassOrNamespace(Name *name) const
    { return resolveClassOrNamespace(name, visibleScopes()); }

    QMap<QString, Document::Ptr> documents() const
    { return _documents; }

    enum ResolveMode {
        ResolveSymbol           = 0x01,
        ResolveClass            = 0x02,
        ResolveNamespace        = 0x04,
        ResolveClassOrNamespace = ResolveClass  | ResolveNamespace,
        ResolveAll              = ResolveSymbol | ResolveClassOrNamespace
    };

    Identifier *identifier(Name *name) const;

    QList<Symbol *> resolve(Name *name, const QList<Scope *> &visibleScopes,
                            ResolveMode mode = ResolveAll) const;

    QList<Symbol *> resolveNamespace(Name *name, const QList<Scope *> &visibleScopes) const
    { return resolve(name, visibleScopes, ResolveNamespace); }

    QList<Symbol *> resolveClass(Name *name, const QList<Scope *> &visibleScopes) const
    { return resolve(name, visibleScopes, ResolveClass); }

    QList<Symbol *> resolveClassOrNamespace(Name *name, const QList<Scope *> &visibleScopes) const
    { return resolve(name, visibleScopes, ResolveClassOrNamespace); }

    QList<Scope *> visibleScopes() const
    { return _visibleScopes; }

    QList<Scope *> visibleScopes(const QPair<FullySpecifiedType, Symbol *> &result) const;

    QList<Scope *> expand(const QList<Scope *> &scopes) const;

    void expand(const QList<Scope *> &scopes, QList<Scope *> *expandedScopes) const;

    void expand(Scope *scope, const QList<Scope *> &visibleScopes,
                QList<Scope *> *expandedScopes) const;

private:
    QList<Scope *> buildVisibleScopes();

private:
    Control *_control;

    // The current symbol.
    Symbol *_symbol;

    // The current expression.
    Document::Ptr _expressionDocument;

    // The current document.
    Document::Ptr _thisDocument;

    // All documents.
    QMap<QString, Document::Ptr> _documents;

    // Visible scopes.
    QList<Scope *> _visibleScopes;
};

} // end of namespace CPlusPlus

#endif // CPLUSPLUS_LOOKUPCONTEXT_H