#pragma once

#include "cplt_fwd.hpp"
#include "Utils/Color.hpp"

#include <iosfwd>
#include <memory>
#include <string>

class BaseValue
{
public:
	enum Kind
	{
		KD_Numeric,
		KD_Text,
		KD_DateTime,
		KD_DatabaseRowId,
		KD_List,

		KD_BaseObject,
		KD_SaleDatabaseRow,
		KD_PurchaseDatabaseRow,
		KD_BaseObjectLast = KD_PurchaseDatabaseRow,

		/// An unspecified type, otherwise known as "any" in some contexts.
		InvalidKind,
		KindCount = InvalidKind,
	};

	struct KindInfo
	{
		ImGui::IconType PinIcon;
		RgbaColor PinColor;
	};

private:
	Kind mKind;

public:
	static const KindInfo& QueryInfo(Kind kind);
	static const char* Format(Kind kind);
	static std::unique_ptr<BaseValue> CreateByKind(Kind kind);

	static bool IsInstance(const BaseValue* value);

	BaseValue(Kind kind);
	virtual ~BaseValue() = default;

	BaseValue(const BaseValue&) = delete;
	BaseValue& operator=(const BaseValue&) = delete;
	BaseValue(BaseValue&&) = default;
	BaseValue& operator=(BaseValue&&) = default;

	Kind GetKind() const;

	// TODO get constant editor

	/// The functions \c ReadFrom, \c WriteTo will only be valid to call if this function returns true.
	virtual bool SupportsConstant() const;
	virtual void ReadFrom(std::istream& stream);
	virtual void WriteTo(std::ostream& stream);
};

class BaseObjectDescription
{
public:
	struct Property
	{
		std::string Name;
		BaseValue::Kind Kind;
		bool Mutatable = true;
	};

public:
	std::vector<Property> Properties;
};

class BaseObjectValue : public BaseValue
{
public:
	/// \param kind A value kind enum, within the range of KD_BaseObject and KD_BaseObjectLast (both inclusive).
	static const BaseObjectDescription& QueryObjectInfo(Kind kind);

	static bool IsInstance(const BaseValue* value);
	BaseObjectValue(Kind kind);

	const BaseObjectDescription& GetObjectDescription() const;

	virtual const BaseValue* GetProperty(int idx) const = 0;
	virtual bool SetProperty(int idx, std::unique_ptr<BaseValue> value) = 0;
};