#ifndef CSM_WOLRD_COMMANDS_H
#define CSM_WOLRD_COMMANDS_H

#include "record.hpp"

#include <map>
#include <memory>
#include <string>
#include <utility>
#include <vector>

#include <QAbstractItemModel>
#include <QModelIndex>
#include <QUndoCommand>
#include <QVariant>

#include "columnimp.hpp"
#include "universalid.hpp"

namespace CSMWorld
{
    class IdTable;
    class IdTree;
    struct NestedTableWrapperBase;

    class TouchCommand : public QUndoCommand
    {
    public:
        TouchCommand(IdTable& model, const std::string& id, QUndoCommand* parent = nullptr);

        void redo() override;
        void undo() override;

    private:
        IdTable& mTable;
        std::string mId;
        std::unique_ptr<RecordBase> mOld;

        bool mChanged;
    };

    /// \brief Adds LandTexture records and modifies texture indices as needed.
    ///
    /// LandTexture records are different from other types of records, because
    /// they only effect the current plugin. Thus, when modifying or copying
    /// a Land record, all of the LandTexture records referenced need to be
    /// added to the current plugin. Since these newly added LandTextures could
    /// have indices that conflict with pre-existing LandTextures in the current
    /// plugin, the indices might have to be changed, both for the newly added
    /// LandRecord and within the Land record.
    class ImportLandTexturesCommand : public QUndoCommand
    {
    public:
        ImportLandTexturesCommand(IdTable& landTable, IdTable& ltexTable, QUndoCommand* parent);

        void redo() override;
        void undo() override;

    protected:
        using DataType = LandTexturesColumn::DataType;

        virtual const std::string& getOriginId() const = 0;
        virtual const std::string& getDestinationId() const = 0;

        virtual void onRedo() = 0;
        virtual void onUndo() = 0;

        IdTable& mLands;
        IdTable& mLtexs;
        DataType mOld;
        int mOldState;
        std::vector<std::string> mCreatedTextures;
    };

    /// \brief This command is used to fix LandTexture records and texture
    ///     indices after cloning a Land. See ImportLandTexturesCommand for
    ///     details.
    class CopyLandTexturesCommand : public ImportLandTexturesCommand
    {
    public:
        CopyLandTexturesCommand(IdTable& landTable, IdTable& ltexTable, const std::string& origin,
            const std::string& dest, QUndoCommand* parent = nullptr);

    private:
        const std::string& getOriginId() const override;
        const std::string& getDestinationId() const override;

        void onRedo() override {}
        void onUndo() override {}

        std::string mOriginId;
        std::string mDestId;
    };

    /// \brief This command brings a land record into the current plugin, adding
    ///     LandTexture records and modifying texture indices as needed.
    /// \note See ImportLandTextures for more details.
    class TouchLandCommand : public ImportLandTexturesCommand
    {
    public:
        TouchLandCommand(IdTable& landTable, IdTable& ltexTable, const std::string& id, QUndoCommand* parent = nullptr);

    private:
        const std::string& getOriginId() const override;
        const std::string& getDestinationId() const override;

        void onRedo() override;
        void onUndo() override;

        std::string mId;
        std::unique_ptr<RecordBase> mOld;

        bool mChanged;
    };

    class ModifyCommand : public QUndoCommand
    {
        QAbstractItemModel* mModel;
        QModelIndex mIndex;
        QVariant mNew;
        QVariant mOld;

        bool mHasRecordState;
        QModelIndex mRecordStateIndex;
        CSMWorld::RecordBase::State mOldRecordState;

    public:
        ModifyCommand(
            QAbstractItemModel& model, const QModelIndex& index, const QVariant& new_, QUndoCommand* parent = nullptr);

        void redo() override;

        void undo() override;
    };

    class CreateCommand : public QUndoCommand
    {
        std::map<int, QVariant> mValues;
        std::map<int, std::pair<int, QVariant>> mNestedValues;
        ///< Parameter order: a parent column, a nested column, a data.
        ///< A nested row has index of 0.

    protected:
        IdTable& mModel;
        std::string mId;
        UniversalId::Type mType;

    protected:
        /// Apply modifications set via addValue.
        void applyModifications();

    public:
        CreateCommand(IdTable& model, const std::string& id, QUndoCommand* parent = nullptr);

        void setType(UniversalId::Type type);

        void addValue(int column, const QVariant& value);

        void addNestedValue(int parentColumn, int nestedColumn, const QVariant& value);

        void redo() override;

        void undo() override;
    };

    class CloneCommand : public CreateCommand
    {
        std::string mIdOrigin;
        std::vector<std::pair<int, QVariant>> mOverrideValues;

    public:
        CloneCommand(IdTable& model, const std::string& idOrigin, const std::string& IdDestination,
            const UniversalId::Type type, QUndoCommand* parent = nullptr);

        void redo() override;

        void undo() override;

        void setOverrideValue(int column, QVariant value);
    };

    class RevertCommand : public QUndoCommand
    {
        IdTable& mModel;
        std::string mId;
        std::unique_ptr<RecordBase> mOld;

        // not implemented
        RevertCommand(const RevertCommand&);
        RevertCommand& operator=(const RevertCommand&);

    public:
        RevertCommand(IdTable& model, const std::string& id, QUndoCommand* parent = nullptr);

        ~RevertCommand() override = default;

        void redo() override;

        void undo() override;
    };

    class DeleteCommand : public QUndoCommand
    {
        IdTable& mModel;
        std::string mId;
        std::unique_ptr<RecordBase> mOld;
        UniversalId::Type mType;

        // not implemented
        DeleteCommand(const DeleteCommand&);
        DeleteCommand& operator=(const DeleteCommand&);

    public:
        DeleteCommand(IdTable& model, const std::string& id, UniversalId::Type type = UniversalId::Type_None,
            QUndoCommand* parent = nullptr);

        ~DeleteCommand() override = default;

        void redo() override;

        void undo() override;
    };

    class ReorderRowsCommand : public QUndoCommand
    {
        IdTable& mModel;
        int mBaseIndex;
        std::vector<int> mNewOrder;

    public:
        ReorderRowsCommand(IdTable& model, int baseIndex, const std::vector<int>& newOrder);

        void redo() override;

        void undo() override;
    };

    class CreatePathgridCommand : public CreateCommand
    {
    public:
        CreatePathgridCommand(IdTable& model, const std::string& id, QUndoCommand* parent = nullptr);

        void redo() override;
    };

    /// \brief Update cell ID according to x/y-coordinates
    ///
    /// \note The new value will be calculated in the first call to redo instead of the
    /// constructor to accommodate multiple coordinate-affecting commands being executed
    /// in a macro.
    class UpdateCellCommand : public QUndoCommand
    {
        IdTable& mModel;
        int mRow;
        QModelIndex mIndex;
        QVariant mNew; // invalid, if new cell ID has not been calculated yet
        QVariant mOld;

    public:
        UpdateCellCommand(IdTable& model, int row, QUndoCommand* parent = nullptr);

        void redo() override;

        void undo() override;
    };

    class NestedTableStoring
    {
        NestedTableWrapperBase* mOld;

    public:
        NestedTableStoring(const IdTree& model, const std::string& id, int parentColumn);

        ~NestedTableStoring();

    protected:
        const NestedTableWrapperBase& getOld() const;
    };

    class DeleteNestedCommand : public QUndoCommand, private NestedTableStoring
    {
        IdTree& mModel;

        std::string mId;

        int mParentColumn;

        int mNestedRow;

        // The command to redo/undo the Modified status of a record
        ModifyCommand* mModifyParentCommand;

    public:
        DeleteNestedCommand(
            IdTree& model, const std::string& id, int nestedRow, int parentColumn, QUndoCommand* parent = nullptr);

        void redo() override;

        void undo() override;
    };

    class AddNestedCommand : public QUndoCommand, private NestedTableStoring
    {
        IdTree& mModel;

        std::string mId;

        int mNewRow;

        int mParentColumn;

        // The command to redo/undo the Modified status of a record
        ModifyCommand* mModifyParentCommand;

    public:
        AddNestedCommand(
            IdTree& model, const std::string& id, int nestedRow, int parentColumn, QUndoCommand* parent = nullptr);

        void redo() override;

        void undo() override;
    };
}

#endif