/* LICENSE BLOCK
Part of mde: a Modular D game-oriented Engine
Copyright © 2007-2008 Diggory Hardy

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, see <http://www.gnu.org/licenses/>. */

/*************************************************************************************************
 * A function to return content widgets and some miscellaneous content display/editing widgets.
 *************************************************************************************************/
module mde.gui.widget.miscContent;

import mde.gui.widget.Widget;
import mde.gui.exception;
import mde.gui.widget.TextWidget;
import mde.gui.widget.layout;
import mde.gui.widget.PopupMenu;

import mde.gui.renderer.IRenderer;
import mde.content.AStringContent;
import mde.content.miscContent;
import Items = mde.content.Items;

debug {
    import tango.util.log.Log : Log, Logger;
    private Logger logger;
    static this () {
	logger = Log.getLogger ("mde.gui.widget.miscContent");
    }
}

/*************************************************************************************************
 * A function which uses Items.get (data.strings[0]) to get a content and creates a widget from
 * data.ints[1]. The first item in each ints and strings is removed before passing data to the new
 * widget.
 * 
 * The function only takes an IContent parameter to satisfy createWidget; it's value is ignored.
 ************************************************************************************************/
IChildWidget addContent (IWidgetManager mgr, IParentWidget parent, widgetID, WidgetData data, IContent) {
    if (data.strings.length != 2) throw new WidgetDataException;
    return mgr.makeWidget (parent, data.strings[1], Items.get (data.strings[0]));
}

/*************************************************************************************************
 * A function which returns the most appropriate content editing widget.
 *
 * Widgets which can be returned: BoolContentWidget (toggle button), ValueContentWidget (generic
 * text-box editor), DisplayContentWidget (generic text label).
 *************************************************************************************************/
IChildWidget editContent (IWidgetManager mgr, IParentWidget parent, widgetID id, WidgetData data, IContent c) {
    // Note: SAFE_RECURSION enabled
    if (c is null) throw new ContentException;
    if (cast(AStringContent) c) {
        if (cast(EnumContent) c)	// can be PopupMenuWidget or ContentListWidget
            return new ContentListWidget(mgr,parent,id,data,c);
        if (cast(BoolContent) c)
            return new BoolContentWidget(mgr,parent,id,data,c);
        return new AStringContentWidget(mgr,parent,id,data,c);
    }
    if (cast(IContentList) c)
        return new ContentListWidget(mgr,parent,id,data,c);
    if (cast(EventContent) c)
        return new ButtonContentWidget(mgr,parent,id,data,c);
    // generic uneditable option
    return new DisplayContentWidget(mgr,parent,id,data,c);
}

/// Editable boolean widget
class BoolContentWidget : AButtonWidget
{
    this (IWidgetManager mgr, IParentWidget parent, widgetID id, WidgetData, IContent c) {
	content = cast(BoolContent) c;
        if (content is null) throw new ContentException (this);
        super (mgr, parent, id);
        wdimPair s = mgr.renderer.getToggleSize;
        w = mw = s.x;
        h = mh = s.y;
    }
    
    override void draw () {
        mgr.renderer.drawToggle (x,y, content(), pushed);
    }
    
    override void activated () {
        content = !content();
    }
    
protected:
    BoolContent content;
}

/// A button connected to an EventContent
class ButtonContentWidget : AButtonWidget
{
    this (IWidgetManager mgr, IParentWidget parent, widgetID id, WidgetData, IContent c) {
	content = cast(EventContent) c;
        if (content is null) throw new ContentException (this);
        adapter = mgr.renderer.getAdapter ();
        super (mgr, parent, id);
    }
    
    override bool setup (uint n, uint flags) {
	if (!(flags & 3)) return false;	// string or renderer (and possibly font) changed
	adapter.text = content.toString(1);
	adapter.getDimensions (mw, mh);
	if (mw != w || mh != h) {
	    w = mw;
	    h = mh;
	}
	return true;
    }
    
    override void draw () {
	super.draw();
	adapter.draw (x,y);
    }
    
    override void activated () {
	content.endEvent;
    }
    
protected:
    IRenderer.TextAdapter adapter;
    EventContent content;
    int index;
}

/** A "tab" widget: it doesn't display the tabs, but shows one of a number of widgets dependant on
 * an EnumContent. */
class SwitchWidget : AParentWidget
{
    this (IWidgetManager mgr, IParentWidget parent, widgetID id, WidgetData data, IContent c) {
        super (mgr, parent, id);
        content = cast(EnumContent) c;
        if (content is null || (subWidgets.length = content.list.length) == 0)
            throw new ContentException (this);
        WDCheck (data, 1, subWidgets.length);
        
        foreach (i,sc; content.list) {
            subWidgets[i] = mgr.makeWidget (this, data.strings[i], sc);
            isWS |= subWidgets[i].isWSizable;
            isHS |= subWidgets[i].isHSizable;
        }
        currentW = subWidgets[content()];
        
        content.addCallback (&switchWidget);
    }
    
    override bool setup (uint n, uint flags) {
        bool r = super.setup (n, flags);
        if (r) {
            mw = currentW.minWidth;
            mh = currentW.minHeight;
            w = currentW.width;
            h = currentW.height;
        }
        return r;
    }
    
    override void minWChange (IChildWidget widget, wdim nmw) {
        if (widget !is currentW) return;
        mw = nmw;
        parent.minWChange (this, nmw);
    }
    override void minHChange (IChildWidget widget, wdim nmh) {
        if (widget !is currentW) return;
        mh = nmh;
        parent.minHChange (this, nmh);
    }
    
    override bool isWSizable () {
        return isWS;
    }
    override bool isHSizable () {
        return isHS;
    }
    
    override void setWidth (wdim nw, int dir) {
	w = (nw >= mw ? nw : mw);
        currentW.setWidth (w, dir);
    }
    override void setHeight (wdim nh, int dir) {
        h = (nh >= mh ? nh : mh);
        currentW.setHeight (h, dir);
    }
    
    override void setPosition (wdim nx, wdim ny) {
        x = nx;
        y = ny;
        currentW.setPosition (nx,ny);
    }
    
    override void draw () {
        currentW.draw;
    }
    
protected:
    // callback on content
    void switchWidget (Content) {
        currentW = subWidgets[content()];
        mw = currentW.minWidth;
        mh = currentW.minHeight;
        parent.minWChange (this, mw);
        parent.minHChange (this, mh);
        w = currentW.width;
        h = currentW.height;
        currentW.setPosition (x,y);
    }
    
    IChildWidget currentW;
    EnumContent content;
    
    bool isWS, isHS;	// no infrastructure for changing sizability, so need to fix it.
}