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#pragma once

#include "clangjobrequest.h"

#include <functional>

namespace ClangBackEnd {

class Documents;

class JobQueue
{
public:
    JobQueue(Documents &documents, const Utf8String &logTag = Utf8String());

    bool add(const JobRequest &job);

    JobRequests processQueue();

    using IsJobRunningForTranslationUnitHandler = std::function<bool(const Utf8String &)>;
    void setIsJobRunningForTranslationUnitHandler(
            const IsJobRunningForTranslationUnitHandler &isJobRunningHandler);

    using IsJobRunningForJobRequestHandler = std::function<bool(const JobRequest &)>;
    void setIsJobRunningForJobRequestHandler(
            const IsJobRunningForJobRequestHandler &isJobRunningHandler);

    using CancelJobRequest = std::function<void(const JobRequest &)>;
    void setCancelJobRequest(const CancelJobRequest &cancelJobRequest);

public: // for tests
    JobRequests &queue();
    const JobRequests &queue() const;
    int size() const;
    void prioritizeRequests();

private:
    bool areRunConditionsMet(const JobRequest &request, const Document &document) const;
    void cancelJobRequest(const JobRequest &jobRequest);
    bool isJobRunningForTranslationUnit(const Utf8String &translationUnitId);
    bool isJobRunningForJobRequest(const JobRequest &jobRequest);
    JobRequests takeJobRequestsToRunNow();
    void removeExpiredRequests();
    bool isJobRequestAddable(const JobRequest &jobRequest, QString &notAddableReason);
    bool isJobRequestExpired(const JobRequest &jobRequest, QString &expirationReason);

private:
    Documents &m_documents;
    Utf8String m_logTag;

    IsJobRunningForTranslationUnitHandler m_isJobRunningForTranslationUnitHandler;
    IsJobRunningForJobRequestHandler m_isJobRunningForJobRequestHandler;
    CancelJobRequest m_cancelJobRequest;

    JobRequests m_queue;
};

} // namespace ClangBackEnd