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#ifndef QBS_RULEGRAPH_H
#define QBS_RULEGRAPH_H

#include <language/filetags.h>
#include <language/forward_decls.h>
#include <tools/set.h>

#include <QtCore/qlist.h>
#include <QtCore/qmap.h>
#include <QtCore/qstring.h>

#include <vector>

namespace qbs {
namespace Internal {

class RuleGraphVisitor
{
public:
    virtual ~RuleGraphVisitor() = default;
    virtual void visit(const RuleConstPtr &parentRule, const RuleConstPtr &rule) = 0;
    virtual void endVisit(const RuleConstPtr &rule) { Q_UNUSED(rule); }
};

class RuleGraph
{
public:
    RuleGraph();

    void build(const std::vector<RulePtr> &rules, const FileTags &productFileTag);
    void accept(RuleGraphVisitor *visitor) const;

    void dump() const;

private:
    void dump_impl(QByteArray &indent, int rootIndex) const;
    int insert(const RulePtr &rule);
    void connect(const Rule *creatingRule, const Rule *consumingRule);
    void traverse(RuleGraphVisitor *visitor, const RuleConstPtr &parentRule,
            const RuleConstPtr &rule) const;

private:
    QMap<FileTag, QList<const Rule*> > m_outputFileTagToRule;
    std::vector<RulePtr> m_rules;
    std::vector< std::vector<int> > m_parents;
    std::vector< std::vector<int> > m_children;
    Set<int> m_rootRules;
};

} // namespace Internal
} // namespace qbs

#endif // QBS_RULEGRAPH_H