/*
Copyright (C) 2007 StrmnNrmn

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 2
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, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
*/

#ifndef UI_UIELEMENT_H_
#define UI_UIELEMENT_H_

#include <vector>
#include <memory>
#include <string>
#include "Base/Types.h"
#include "UIAlignment.h"


class CUIContext;
class c32;

class CUIElement
{
public:
    virtual ~CUIElement();

    virtual bool IsSelectable() const { return true; }

    virtual void OnSelected() {}        // Selected with Start/X
    virtual void OnNext() {}
    virtual void OnPrevious() {}

    virtual u32 GetHeight(CUIContext *context) const = 0;
    virtual void Draw(CUIContext *context, s32 min_x, s32 max_x, EAlignType halign, s32 y, bool selected) const = 0;

    virtual const std::string GetDescription() const = 0;

private:
};

class CUIElementBag
{
public:
    CUIElementBag();
    ~CUIElementBag();

    u32 Add(std::unique_ptr<CUIElement> element) {
        u32 idx = mElements.size();
        mElements.emplace_back(std::move(element));
        return idx;
    }

    void Clear() { mElements.clear(); mSelectedIdx = 0; }

#ifdef DAEDALUS_ENABLE_ASSERTS
    void SetSelected(u32 idx) { DAEDALUS_ASSERT(idx < mElements.size(), "Invalid idx"); mSelectedIdx = idx; }
#else
    void SetSelected(u32 idx) { mSelectedIdx = idx; }
#endif

    void SelectNext();
    void SelectPrevious();

    u32 GetNumElements() const { return mElements.size(); }

#ifdef DAEDALUS_ENABLE_ASSERTS
    CUIElement* GetElement(u32 i) const {
        DAEDALUS_ASSERT(i < mElements.size(), "Invalid idx");
        return mElements[i].get();
    }
#else
    CUIElement* GetElement(u32 i) const { return mElements[i].get(); }
#endif

    u32 GetSelectedIndex() const { return mSelectedIdx; }
    CUIElement* GetSelectedElement() const {
        if (mSelectedIdx < mElements.size()) return mElements[mSelectedIdx].get();
        return nullptr;
    }

    void Draw(CUIContext *context, s32 min_x, s32 max_x, EAlignType halign, s32 y) const;
    void DrawCentredVertically(CUIContext *context, s32 min_x, s32 min_y, s32 max_x, s32 max_y) const;

private:
    std::vector<std::unique_ptr<CUIElement>> mElements;
    u32 mSelectedIdx;
};

#endif // UI_UIELEMENT_H_