/*
 * Copyright (c) 2014-2015, Claudio Lapilli and the newRPL Team
 * All rights reserved.
 * This file is released under the 3-clause BSD license.
 * See the file LICENSE.txt that shipped with this distribution.
 */

#include <newrpl.h>
#include "libraries.h"
#include <ui.h>


void uiRepaintForm(DRAWSURFACE *scr)
{
    // REPAINT VISIBLE PART OF A FORM
    UNUSED_ARGUMENT(scr);

}


// COMPUTE THE TOTAL DIMENSIONS OF A FORM
// USED TO ALLOCATE THE FORM BITMAP

void uiFormGetDimensions(WORDPTR form,BINT *width,BINT *height)
{
    BINT w=0,h=0;
    BINT roww,rowh;
    WORDPTR item,end;

    if(!ISLIST(*form)) {
        if(width) *width=0;
        if(height) *height=0;
        return;
    }
    end=rplSkipOb(form);
    item=form+1;
    while(item<end) {
        roww=SCREEN_WIDTH;

        if(ISBINT(*item)) { rowh=rplReadBINT(item); item=rplSkipOb(item); }
        else {
            // TODO: DEFINE THE HEIGHT FOR VARIOUS OTHER TYPES

            // BY DEFAULT, THIS IS THE HEIGHT OF ONE LINE OF TEXT
            rowh=(*halScreen.FontArray[FONT_FORMS])->BitmapHeight;

        }

        if(ISLIST(*item)) {
            // A LIST OF COLUMNS
            int ncols=0,forced=0;
            roww=0;
            WORDPTR col=item+1,endcol=rplSkipOb(item);

            while(col<endcol) {
                // SCAN THE COLUMN

                if(ISBINT(*col)) { roww+=rplReadBINT(col); col=rplSkipOb(col); ++forced; }

                if(*col!=CMD_ENDLIST) ++ncols;
                col=rplSkipOb(col);

            }

            roww+=(ncols-forced)*(SCREEN_WIDTH/(ncols));

        }

        // HERE WE HAVE ROW WIDTH AND HEIGHT
        h+=rowh;
        if(roww>w) w=roww;

        item=rplSkipOb(item);
        }

    if(width) *width=w;
    if(height) *height=h;

}



void uiUpdateForm(WORDPTR form)
{
    // THE FORM IS A LIST OF ELEMENTS IN ROW ORDER
    // AN ELEMENT CAN BE ONLY 3 THINGS: TEXT, AN IDENT OR A LIST. ANY OF THESE ELEMENTS MIGHT BE PRECEDED BY AN INTEGER WITH THE ROW HEIGHT
    // ELEMENTS:
    //          INTEGERS: AN INTEGER PROVIDES THE HEIGHT OF THE CURRENT ROW, THEN IT'S IGNORED
    //                    A ROW WITHOUT AN INTEGER NUMBER DEFAULTS TO THE FONT HEIGHT OF THE FORM (1 LINE)
    //          TEXT:     WILL BE OUTPUT LITERALLY ON THE FORM
    //          IDENT:    THE IDENTIFIER IS TREATED AS A FIELD NAME. SEVERAL RELATED IDENTIFIERS DEFINE A FIELD.
    //          LIST:     IF THE ROW IS A LIST, THEN ELEMENTS ARE LAID OUT IN COLUMNS FROM LEFT TO RIGHT
    //                    COLUMN ELEMENTS ARE THE SAME WAY, WHERE INTEGERS OPTIONALLY DEFINE THE WIDTH OF THE ITEM (DEFAULT TO EQUALLY SPACED)

    // PASS 1: COMPUTE TOTAL WIDTH AND HEIGHT

    if(!ISLIST(*form)) return;

    BINT formw,formh;
    uiFormGetDimensions(form,&formw,&formh);

    // ALLOCATE NEW BITMAP
    ScratchPointer1=form;

    WORDPTR newbmp=rplBmpCreate(DEFAULTBITMAPMODE,formw,formh,1);   // ALLOCATE A NEW BITMAP AND CLEAR IT
    if(!newbmp) return;
    form=ScratchPointer1;


    // PASS 2: REDRAW EACH ELEMENT ONTO THE NEW BITMAP

    DRAWSURFACE backgnd;

    backgnd.addr=(int *)(newbmp+3);
    backgnd.width=formw;
    backgnd.x=0;
    backgnd.y=0;

    BINT ycoord=0;


    BINT roww,rowh,rowid=0;
    WORDPTR item,end;
    end=rplSkipOb(form);
    item=form+1;
    while(item<end) {
        roww=SCREEN_WIDTH;

        if(ISBINT(*item)) { rowh=rplReadBINT(item); item=rplSkipOb(item); }
        else rowh=(*halScreen.FontArray[FONT_FORMS])->BitmapHeight;


        if(ISLIST(*item)) {
            // A LIST OF COLUMNS
            int ncols=0,forced=0;
            roww=0;
            WORDPTR col=item+1,endcol=rplSkipOb(item);
            BINT def_itemw,itemw;

            while(col<endcol) {
                // SCAN THE COLUMN

                if(ISBINT(*col)) { roww+=rplReadBINT(col); col=rplSkipOb(col); ++forced; }

                if(*col!=CMD_ENDLIST) ++ncols;
                col=rplSkipOb(col);

            }
            def_itemw=SCREEN_WIDTH/ncols;
            roww+=(ncols-forced)*(SCREEN_WIDTH/(ncols));

            // NOW RENDER IT

            col=item+1;
            backgnd.clipx=0;
            backgnd.clipy=ycoord;
            backgnd.clipy2=ycoord+rowh-1;
            while(col<endcol) {
                if(ISBINT(*col)) { itemw=rplReadBINT(col); col=rplSkipOb(col); }
                else itemw=def_itemw;
                if(ISSTRING(*col)) {
                    // DRAW THE STRING
                    // TODO: SUPPORT MULTILINE TEXT HERE, WITH PROPER TEXT WRAP
                    backgnd.clipx2=backgnd.clipx+itemw-1;
                    DrawTextBkN(backgnd.clipx,backgnd.clipy,(char *)(col+1),(char *)(col+1)+rplStrSize(col),*halScreen.FontArray[FONT_FORMS],0xf,0,&backgnd);
                    backgnd.clipx=backgnd.clipx2+1;
                }

                //TODO: RENDER FIELDS HERE

                col=rplSkipOb(col);

            }


        }

        if(ISSTRING(*item))
        {
            // DRAW THE STRING
            // TODO: SUPPORT MULTILINE TEXT HERE, WITH PROPER TEXT WRAP
            backgnd.clipx=0;
            backgnd.clipy=ycoord;
            backgnd.clipy2=ycoord+rowh-1;
            backgnd.clipx2=backgnd.clipx+roww-1;
            DrawTextBkN(backgnd.clipx,backgnd.clipy,(char *)(item+1),(char *)(item+1)+rplStrSize(item),*halScreen.FontArray[FONT_FORMS],0xf,0,&backgnd);
            if(!rowid) {
                // THIS IS THE FORM TITLE, HIGHLIGHT IT
                DRAWSURFACE copy;
                copy.addr=backgnd.addr;
                copy.width=backgnd.width;

                copy.x=0;
                copy.y=0;
                copy.clipx=backgnd.x;
                backgnd.x=(backgnd.width-backgnd.x)/2;
                // CENTER THE TEXT
                ggl_bitblt(&backgnd,&copy,copy.clipx,backgnd.clipy2-backgnd.clipy+1);
                ggl_cliprect(&backgnd,backgnd.x+copy.clipx,backgnd.clipy,backgnd.clipx2,backgnd.clipy2,0x44444444);
                ggl_cliprect(&backgnd,0,backgnd.clipy,backgnd.x-1,backgnd.clipy2,0x44444444);
            }

        }

        // TODO: RENDER FIELDS HERE

        // NEXT ROW
        ycoord+=rowh;
        rowid++;
        item=rplSkipOb(item);
        }

    // DONE, EVERYTHING WAS DRAWN

    uiUpdateOrAddCacheEntry(form,newbmp,halScreen.FontArray[FONT_FORMS]);



}