/*
 * Libpdraw: A Versitile GUI for use with a primitive drawing system!
 * Copyright (C) 2022 Rebekah Rowe
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */

#include "glez/color.hpp"
#include "input.hpp"
#include <cassert>
#include <functional>
#include <glez/font.hpp>
#include <string_view>
#include <vector>

#pragma once

namespace ui {

template <typename T>
class Var;

using Enum = std::vector<std::string_view>;
using TreeMap = std::vector<std::string_view>;
using CommandArgs = std::vector<std::string_view>;

class BaseVar {
public:
    enum class Type {
        kBool,
        kInt,
        kFloat,
        kKey,
        kEnum,
        kString,
        kColor,
        kFont
    };

public:
    BaseVar(Type, TreeMap, std::string_view _gui_name);

    const Type type;
    const TreeMap gui_map;
    const std::string command_name;
    const std::string_view gui_name;

    virtual void Call(std::ostream&, CommandArgs) = 0;
    virtual std::string GetString() = 0; // Used by cfg mgr and gui
    virtual void SetString(std::string_view) = 0;
    virtual void SetDefault() = 0;

private:
    static inline std::vector<BaseVar*> list;

public:
    static inline const auto& GetList() { return list; }
};

template <typename T>
class Var;

template <>
class Var<bool> : public BaseVar {
public:
    Var(TreeMap, std::string_view, bool _defaults);

    std::string GetString() final;
    void SetString(std::string_view) final;
    void Call(std::ostream&, CommandArgs) final;
    void SetDefault() final;

    operator bool() const { return this->value; }
    bool operator==(bool v) const { return this->value == v; }
    Var<bool>& operator=(bool v);

private:
    bool value;

public:
    const bool defaults;
    std::function<void(bool)> Callback;
};

template <>
class Var<int> : public BaseVar {
public:
    Var<int>(TreeMap, std::string_view, int _defaults, int min, int max);
    Var<int>(TreeMap, std::string_view, int _defaults, int max = 100);

    std::string GetString() override;
    void SetString(std::string_view) override;
    void Call(std::ostream&, CommandArgs) override;
    void SetDefault() final;

    operator int() const { return this->value; }
    bool operator==(int v) const { return this->value == v; }
    Var<int>& operator=(int v);

protected:
    int value;

public:
    const int defaults, min, max;
    std::function<void(int)> Callback;
};
template <>
class Var<float> : public BaseVar {
public:
    Var(TreeMap, std::string_view, float _defaults);
    Var(TreeMap, std::string_view, float _defaults, float max);
    Var(TreeMap, std::string_view, float _defaults, float min, float max);
    std::string GetString() final;
    void SetString(std::string_view) final;
    void Call(std::ostream&, CommandArgs) final;
    void SetDefault() final;

    operator float() const { return this->value; }
    bool operator==(float v) const { return this->value == v; }
    Var<float>& operator=(float v);

private:
    float value;

public:
    const float defaults, min, max;
    std::function<void(float)> Callback;
};

template <>
class Var<Enum> : public Var<int> {
public:
    Var(TreeMap, std::string_view name, int _defaults, Enum _enum);
    std::string GetString() final;
    void SetString(std::string_view) final;
    void Call(std::ostream&, CommandArgs) final;

    operator int() const { return this->value; }
    bool operator==(int v) const { return this->value == v; }
    using Var<int>::operator=;

public:
    const std::vector<std::string_view> internal_enum;
};

template <>
class Var<std::string> : public BaseVar {
public:
    Var(TreeMap, std::string_view, std::string_view _defaults);
    Var(TreeMap, std::string_view, std::string_view _defaults, float max);
    Var(TreeMap, std::string_view, std::string_view _defaults, float min, float max);
    std::string GetString() final;
    void SetString(std::string_view) final;
    void Call(std::ostream&, CommandArgs) final;
    void SetDefault() final;

    operator std::string_view() const { return this->value; }
    operator const std::string&() const { return this->value; }
    operator std::string() const { return this->value; }
    bool operator==(std::string_view v) const { return std::string_view(this->value) == v; }
    bool operator==(const std::string& v) const { return this->value == v; }
    Var<std::string>& operator=(std::string_view v) { return *this = std::string(v); }
    Var<std::string>& operator=(std::string v);

private:
    std::string value;

public:
    const std::string_view defaults;
    const int min, max;
    std::function<void(std::string_view)> Callback;
};

template <>
class Var<CatKey> : public BaseVar {
public:
    Var(TreeMap, std::string_view, CatKey _defaults);
    std::string GetString() final;
    void SetString(std::string_view) final;
    void Call(std::ostream&, CommandArgs) final;
    void SetDefault() final;

    operator bool() const;
    operator CatKey() const { return this->value; }
    bool operator==(CatKey v) const { return this->value == v; }
    Var<CatKey>& operator=(CatKey v);

private:
    CatKey value;

public:
    const CatKey defaults;
    std::function<void(CatKey)> Callback;
};

} // namespace ui