/*  This code is based on Apple's "GeekGameBoard" sample code, version 1.0.

     http://developer.apple.com/samplecode/GeekGameBoard/

     Copyright © 2007 Apple Inc. Copyright © 2008 Jens Alfke. All Rights Reserved.

     Redistribution and use in source and binary forms, with or without modification, are permitted

     provided that the following conditions are met:

     * Redistributions of source code must retain the above copyright notice, this list of conditions

       and the following disclaimer.

     * Redistributions in binary form must reproduce the above copyright notice, this list of

       conditions and the following disclaimer in the documentation and/or other materials provided

       with the distribution.

     THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR

     IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND 

     FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRI-

     BUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES

     (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 

     PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 

     CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF 

     THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 */

 #import "CheckersGame.h"

 #import "Grid.h"

 #import "Piece.h"

 #import "QuartzUtils.h"

 @implementation CheckersGame

 - (void) addPieces: (NSString*)imageName

             toGrid: (Grid*)grid

          forPlayer: (int)playerNum

               rows: (NSRange)rows

        alternating: (BOOL)alternating

 {

     Piece *prototype = [[Piece alloc] initWithImageNamed: imageName scale: floor(grid.spacing.width * 0.8)];

     prototype.owner = [self.players objectAtIndex: playerNum];

     unsigned cols=grid.columns;

     for( unsigned row=rows.location; row<NSMaxRange(rows); row++ )

         for( unsigned col=0; col<cols; col++ ) {

             if( !alternating || ((row+col) & 1) == 0 ) {

                 GridCell *cell = [grid cellAtRow: row column: col];

                 if( cell ) {

                     Piece *piece = [prototype copy];

                     cell.bit = piece;

                     [piece release];

                     //cell.bit.rotation = random() % 360; // keeps pieces from looking too samey

                     _numPieces[playerNum]++;

                 }

             }

         }

     [prototype release];

 }

 - (Grid*) x_makeGrid

 {

     RectGrid *grid = [[[RectGrid alloc] initWithRows: 8 columns: 8 frame: _board.bounds] autorelease];

     CGPoint pos = grid.position;

     pos.x = floor((_board.bounds.size.width-grid.frame.size.width)/2);

     [grid addAllCells];

     grid.position = pos;

     grid.allowsMoves = YES;

     grid.allowsCaptures = NO;

     grid.cellColor = CGColorCreateGenericGray(0.0, 0.25);

     grid.altCellColor = CGColorCreateGenericGray(1.0, 0.25);

     grid.lineColor = nil;

     [self addPieces: @"Green Ball.png" toGrid: grid forPlayer: 0 rows: NSMakeRange(0,3) alternating: YES];

     [self addPieces: @"Red Ball.png"   toGrid: grid forPlayer: 1 rows: NSMakeRange(5,3) alternating: YES];

     return grid;

 }

 - (id) initWithBoard: (CALayer*)board

 {

     self = [super initWithBoard: board];

     if (self != nil) {

         [self setNumberOfPlayers: 2];

         [board addSublayer: [self x_makeGrid]];

         [self nextPlayer];

     }

     return self;

 }

 - (BOOL) canBit: (Bit*)bit moveFrom: (id<BitHolder>)srcHolder to: (id<BitHolder>)dstHolder

 {

     Square *src=(Square*)srcHolder, *dst=(Square*)dstHolder;

     if( [bit valueForKey: @"King"] )

         if( dst==src.bl || dst==src.br || dst==src.l || dst==src.r

            || (src.bl.bit.unfriendly && dst==src.bl.bl) || (src.br.bit.unfriendly && dst==src.br.br) )

             return YES;    

     return dst==src.fl || dst==src.fr

         || (src.fl.bit.unfriendly && dst==src.fl.fl) || (src.fr.bit.unfriendly && dst==src.fr.fr);

 }

 - (void) bit: (Bit*)bit movedFrom: (id<BitHolder>)srcHolder to: (id<BitHolder>)dstHolder

 {

     Square *src=(Square*)srcHolder, *dst=(Square*)dstHolder;

     int playerIndex = self.currentPlayer.index;

     BOOL isKing = ([bit valueForKey: @"King"] != nil);

     [[NSSound soundNamed: (isKing ?@"Funk" :@"Tink")] play];

     // "King" a piece that made it to the last row:

     if( dst.row == (playerIndex ?0 :7) )

         if( ! isKing ) {

             [[NSSound soundNamed: @"Blow"] play];

             bit.scale = 1.4;

             [bit setValue: @"King" forKey: @"King"];

             // don't set isKing flag - piece can't jump again after being kinged.

         }

     // Check for a capture:

     Square *capture = nil;

     if(dst==src.fl.fl)

         capture = src.fl;

     else if(dst==src.fr.fr)

         capture = src.fr;

     else if(dst==src.bl.bl)

         capture = src.bl;

     else if(dst==src.br.br)

         capture = src.br;

     if( capture ) {

         [[NSSound soundNamed: @"Pop"] play];

         Bit *bit = capture.bit;

         _numPieces[bit.owner.index]--;

         [bit destroy];

         // Now check if another capture is possible. If so, don't end the turn:

         if( (dst.fl.bit.unfriendly && dst.fl.fl.empty) || (dst.fr.bit.unfriendly && dst.fr.fr.empty) )

             return;

         if( isKing )

             if( (dst.bl.bit.unfriendly && dst.bl.bl.empty) || (dst.br.bit.unfriendly && dst.br.br.empty) )

                 return;

     }

     [self endTurn];

 }

 - (Player*) checkForWinner

 {

     // Whoever runs out of pieces loses:

     if( _numPieces[0]==0 )

         return [self.players objectAtIndex: 1];

     else if( _numPieces[1]==0 )

         return [self.players objectAtIndex: 0];

     else

         return nil;

 }

 @end