/////////////////////////////////////////////////////////////////////////////
// Name:        pile.cpp
// Purpose:     Forty Thieves patience game
// Author:      Chris Breeze
// Modified by:
// Created:     21/07/97
// RCS-ID:      $Id$
// Copyright:   (c) 1993-1998 Chris Breeze
// Licence:   	wxWindows licence
//---------------------------------------------------------------------------
// Last modified: 22nd July 1998 - ported to wxWindows 2.0
/////////////////////////////////////////////////////////////////////////////
//+-------------------------------------------------------------+
//| Description:												|
//|	The base class for holding piles of playing cards.			|
//+-------------------------------------------------------------+

#ifdef __GNUG__
#pragma implementation
#pragma interface
#endif

// For compilers that support precompilation, includes "wx/wx.h".
#include "wx/wxprec.h"

#ifdef __BORLANDC__
#pragma hdrstop
#endif

#ifndef WX_PRECOMP
#include "wx/wx.h"
#endif
#ifdef __GNUG__
#pragma implementation
#endif

#include <stdlib.h>
#include <stdio.h>
#include <time.h>
#include <string.h>
#include "card.h"
#include "pile.h"


//+-------------------------------------------------------------+
//| Pile::Pile()												|
//+-------------------------------------------------------------+
//| Description:												|
//|	Initialise the pile to be empty of cards.					|
//+-------------------------------------------------------------+
Pile::Pile(int x, int y, int dx, int dy)
{
    m_x = x;
    m_y = y;
    m_dx = dx;
    m_dy = dy;
    for (m_topCard = 0; m_topCard < NumCards; m_topCard++)
    {
    	m_cards[m_topCard] = 0;
    }
    m_topCard = -1;	// i.e. empty
}


//+-------------------------------------------------------------+
//| Pile::Redraw()												|
//+-------------------------------------------------------------+
//| Description:												|
//|	Redraw the pile on the screen. If the pile is empty			|
//|	just draw a NULL card as a place holder for the pile.		|
//|	Otherwise draw the pile from the bottom up, starting		|
//|	at the origin of the pile, shifting each subsequent			|
//|	card by the pile's x and y offsets.							|
//+-------------------------------------------------------------+
void Pile::Redraw(wxDC& dc)
{
	if (m_topCard >= 0)
	{
		if (m_dx == 0 && m_dy == 0)
		{
			m_cards[m_topCard]->Draw(dc, m_x, m_y);
		}
		else
		{
			int x = m_x;
			int y = m_y;
			for (int i = 0; i <= m_topCard; i++)
			{
				m_cards[i]->Draw(dc, x, y);
				x += m_dx;
				y += m_dy;
			}
		}
	}
	else
	{
		Card::DrawNullCard(dc, m_x, m_y);
	}
}


//+-------------------------------------------------------------+
//| Pile::GetTopCard()	                                        |
//+-------------------------------------------------------------+
//| Description:												|
//|	Return a pointer to the top card in the pile or NULL		|
//|	if the pile is empty.										|
//| NB:	Gets a copy of the card without removing it from the	|
//|	pile.														|
//+-------------------------------------------------------------+
Card* Pile::GetTopCard()
{
    Card* card = 0;

    if (m_topCard >= 0)
    {
    	card = m_cards[m_topCard];
    }
    return card;
}


//+-------------------------------------------------------------+
//| Pile::RemoveTopCard()                                       |
//+-------------------------------------------------------------+
//| Description:												|
//|	If the pile is not empty, remove the top card from the		|
//|	pile and return the pointer to the removed card.			|
//|	If the pile is empty return a NULL pointer.					|
//+-------------------------------------------------------------+
Card* Pile::RemoveTopCard()
{
    Card* card = 0;

    if (m_topCard >= 0)
    {
		card = m_cards[m_topCard--];
    }
    return card;
}


//+-------------------------------------------------------------+
//| Pile::RemoveTopCard()                                       |
//+-------------------------------------------------------------+
//| Description:												|
//|	As RemoveTopCard() but also redraw the top of the pile		|
//|	after the card has been removed.							|
//| NB:	the offset allows for the redrawn area to be in a		|
//|	bitmap ready for 'dragging' cards acrosss the screen.		|
//+-------------------------------------------------------------+
Card* Pile::RemoveTopCard(wxDC& dc, int xOffset, int yOffset)
{
	int topX, topY, x, y;

	GetTopCardPos(topX, topY);
	Card* card = RemoveTopCard();

	if (card)
	{
		card->Erase(dc, topX - xOffset, topY - yOffset);
		GetTopCardPos(x, y);
		if (m_topCard < 0)
		{
			Card::DrawNullCard(dc, x - xOffset, y - yOffset);
		}
		else
		{
			m_cards[m_topCard]->Draw(dc, x - xOffset, y - yOffset);
		}
	}

	return card;
}


void Pile::GetTopCardPos(int& x, int& y)
{
	if (m_topCard < 0)
	{
		x = m_x;
		y = m_y;
	}
	else
	{
		x = m_x + m_dx * m_topCard;
		y = m_y + m_dy * m_topCard;
	}
}

void Pile::AddCard(Card* card)
{
    if (m_topCard < -1) m_topCard = -1;

    m_cards[++m_topCard] = card;
}

void Pile::AddCard(wxDC& dc, Card* card)
{
    AddCard(card);
    int x, y;
    GetTopCardPos(x, y);
    card->Draw(dc, x, y);
}

// Can the card leave this pile.
// If it is a member of the pile then the answer is yes.
// Derived classes may override this behaviour to incorporate
// the rules of the game
bool Pile::CanCardLeave(Card* card)
{
    for (int i = 0; i <= m_topCard; i++)
    {
    	if (card == m_cards[i]) return TRUE;
    }
    return FALSE;
}

// Calculate how far x, y is from top card in the pile
// Returns the square of the distance
int Pile::CalcDistance(int x, int y)
{
    int cx, cy;
    GetTopCardPos(cx, cy);
    return ((cx - x) * (cx - x) + (cy - y) * (cy - y));
}


// Return the card at x, y. Check the top card first, then
// work down the pile. If a card is found then return a pointer
// to the card, otherwise return NULL
Card* Pile::GetCard(int x, int y)
{
	int cardX;
	int cardY;
	GetTopCardPos(cardX, cardY);

	for (int i = m_topCard; i >= 0; i--)
	{
		if (x >= cardX && x <= cardX + CardWidth &&
			y >= cardY && y <= cardY + CardHeight)
		{
			return m_cards[i];
		}
		cardX -= m_dx;
		cardY -= m_dy;
	}
	return 0;
}


// Return the position of the given card. If it is not a member of this pile
// return the origin of the pile.
void Pile::GetCardPos(Card* card, int& x, int& y)
{
	x = m_x;
	y = m_y;

	for (int i = 0; i <= m_topCard; i++)
	{
		if (card == m_cards[i])
		{
			return;
		}
		x += m_dx;
		y += m_dy;
	}

	// card not found in pile, return origin of pile
	x = m_x;
	y = m_y;
}


bool Pile::Overlap(int x, int y)
{
    int cardX;
    int cardY;
    GetTopCardPos(cardX, cardY);

    if (x >= cardX - CardWidth  && x <= cardX + CardWidth &&
	y >= cardY - CardHeight && y <= cardY + CardHeight)
    {
	    return TRUE;
    }
    return FALSE;
}


Pile::~Pile()
{
// nothing special at the moment
}