// ===========================================================================
// Copyright 2018 Autodesk, Inc. All rights reserved.
//
// Use of this software is subject to the terms of the Autodesk license
// agreement provided at the time of installation or download, or which
// otherwise accompanies this software in either electronic or hard copy form.
// ===========================================================================
// ===========================================================================
//
//  Procedure Name:
//      texAddShellToShell
//
//  Description:
//      UV workflow function used by texMultiStitch() for adding a shell to
//      another. See notes for a more-indepth description on the format.
//
//  Input Arguments
//      shellA               - String   - UV shell A
//      shellB               - String   - UV shell B
//      order                - Int      - Determines how to add up the areas. 0 for
//                                        keeping the area of the larger shell, 1
//                                        for keeping the smaller one, 2 for adding
//                                        the two areas together.
//
//  Return Value:
//      String               - The finalized list of UV shells. See notes
//                             below for info on the format.
//
//  Notes:
//  This script is part of the implementation of Nightshade UV Editor into
//  Autodesk Maya. This script is sourced by other scripts. Do not run it 
//  directly. The inbound shell strings and the outbound string array elements
//  have two properties: the actual component list (UVs) and the size of their
//  UV face area. The attributes are separated by % and the UVs by spaces.
//  The format is of the below style:
//  0.2513%pCube1.map[13] pCube1.map[7] pCube1.map[1] pCube1.map[2]
//
// ===========================================================================


global proc string texAddShellToShell(string $shellA, string $shellB, int $order)
{
    string $shellAAttributes[] = stringToStringArray($shellA, "%");
    string $shellBAttributes[] = stringToStringArray($shellB, "%");

    // Add together shell list and size attributes
    float $area, $areaA, $areaB;
    if ($shellAAttributes[0] != "") // Attribute will be empty for the last edge being stitched
        $areaA = (float)$shellAAttributes[0];
    if ($shellBAttributes[0] != "")
        $areaB = (float)$shellBAttributes[0];

    if ($order == 0){
        $area = ($areaA > $areaB) ? $areaA : $areaB;
    } else if ($order == 1){
        $area = ($areaA > $areaB) ? $areaB : $areaA;
    } else{
        $area = ((float)$shellAAttributes[0] + (float)$shellBAttributes[0]);
    }

    string $shellString = $shellAAttributes[1] + " " + $shellBAttributes[1];
    $shellString = (string)$area + "%" + $shellString;

    return $shellString;
}