/*  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"

#import "GGBUtils.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 = CreateGray(0.0, 0.25);

    grid.altCellColor = CreateGray(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: (GGBLayer*)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);

    PlaySound(isKing ?@"Funk" :@"Tink");

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

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

        if( ! isKing ) {

            PlaySound(@"Blow");

            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 ) {

        PlaySound(@"Pop");

        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