#pragma once

#include <string>
#include <map>
#include <vector>

class PerformanceData;
class SGPath;

#include <simgear/structure/subsystem_mgr.hxx>

/**
 * Registry for performance data.
 *
 * Allows to store performance data for later reuse/retrieval. Just
 * a simple map for now.
 *
 * @author Thomas F�rster <t.foerster@biologie.hu-berlin.de>
*/
//TODO provide std::map interface?
class PerformanceDB : public SGSubsystem
{
public:
    PerformanceDB() = default;
    virtual ~PerformanceDB() = default;

    // Subsystem API.
    void init() override;
    void shutdown() override;
    void update(double dt) override;

    // Subsystem identification.
    static const char* staticSubsystemClassId() { return "aircraft-performance-db"; }

    bool havePerformanceDataForAircraftType(const std::string& acType) const;

    /**
     * get performance data for an aircraft type / class. Type is specific, eg
     * '738' or 'A319'. Class is more generic, such as 'jet_transport'.
     */
    PerformanceData* getDataFor(const std::string& acType, const std::string& acClass) const;

    PerformanceData* getDefaultPerformance() const;

private:
    void load(const SGPath& path);

    void registerPerformanceData(const std::string& id, PerformanceData* data);

    typedef std::map<std::string, PerformanceData*> PerformanceDataDict;
    PerformanceDataDict _db;

    const std::string& findAlias(const std::string& acType) const;

    typedef std::pair<std::string, std::string> StringPair;
    /// alias list, to allow type/class names to share data. This is used to merge
    /// related types together. Note it's ordered, and not a map since we permit
    /// partial matches when merging - the first matching alias is used.
    std::vector<StringPair> _aliases;
};