/*
 * This file is a part of TTCalc - a mathematical calculator
 * and is distributed under the (new) BSD licence.
 * Author: Tomasz Sowa <t.sowa@slimaczek.pl>
 */

/* 
 * Copyright (c) 2006-2009, Tomasz Sowa
 * 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.
 *    
 *  * Neither the name Tomasz Sowa nor the names of contributors to this
 *    project may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * 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 CONTRIBUTORS 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.
 */

#include <windows.h>
#include <ttmath/ttmath.h>
#include "programresources.h"
#include "resource.h"
#include "messages.h"
#include "bigtypes.h"


namespace Pad
{
HWND edit;
WNDPROC old_edit_proc;
std::string parse_string;
int precision;
HFONT font;

int  base_input;
int  base_output;
bool always_scientific;
int  when_scientific;
int  rounding;
bool remove_zeroes;
int  angle_deg_rad_grad;
char decimal_point;
Languages::Country country;
ttmath::Objects * variables;
ttmath::Objects * functions;
ttmath::ErrorCode code;
bool calculated;

std::string res, res2;

#ifndef TTCALC_PORTABLE
	ttmath::Parser<TTMathBig1> parser1;
	ttmath::Parser<TTMathBig2> parser2;
	ttmath::Parser<TTMathBig3> parser3;
#else
	ttmath::Parser<TTMathBig1> parser1;
#endif


void PutChars(const char * str)
{
	SendMessage(edit, EM_REPLACESEL, true, (LPARAM)str);
}


void PutChars(std::string & str)
{
	PutChars(str.c_str());
}


void PutOverflowMsg()
{
	PutChars(GetPrgRes()->GetLanguages()->ErrorMessage(country, ttmath::err_overflow));
	PutChars("\r\n");
}


template<typename ValueType>
void PutResultFromParser(ttmath::Parser<ValueType> & matparser)
{
unsigned int i = 0;

	res.clear();
	res2.clear();

	for(i=0 ; i<matparser.stack.size() ; ++i)
	{
		try
		{
			ValueType result = matparser.stack[i].value;
			
			if( result.ToString(res2, base_output, always_scientific, when_scientific, rounding, remove_zeroes, decimal_point) )
				res2 = GetPrgRes()->GetLanguages()->GuiMessage(country, Languages::overflow_during_printing);
		}
		catch(...)
		{
			res2 = GetPrgRes()->GetLanguages()->ErrorMessage(country, ttmath::err_internal_error);
		}

		res += res2;

		if( i < matparser.stack.size()-1 )
			res += "\r\n";
	}

	res += ' ';
	PutChars(res);
}


void PutResult()
{
	#ifndef TTCALC_PORTABLE

		switch( precision )
		{
		case 0:
			PutResultFromParser(parser1);
			break;

		case 1:
			PutResultFromParser(parser2);
			break;

		default:
			PutResultFromParser(parser3);
			break;
		}

	#else

		PutResultFromParser(parser1);

	#endif
}



// line - index of a line -- as you see it on the edit control
// (if the text is wrapped then the line is larger)
void GetParseString(const char * buf, int line)
{
int i;

	int first_line_char = SendMessage(edit, EM_LINEINDEX, line, 0);
	// first_line_char takes into consideration \r\n characters

	if( first_line_char < 0 )
		// something wrong
		return;

	// looking for the line
	for(i=0 ; i<first_line_char && buf[i]!=0 ; ++i);

	// looking for the beginning of the line
	for( ; i>0 && buf[i-1]!=10 ; --i);

	// copying the whole line
	for( ; buf[i]!=0 && buf[i]!='\r' && buf[i]!='\n' ; ++i )
		parse_string += buf[i];
}


void GetParseString()
{
int line;

	parse_string.clear();

	// index of a last line to parse (-1 because the ENTER has been put)
	line = SendMessage(edit, EM_LINEFROMCHAR, -1, 0) - 1;

	if( line < 0 )
		// something wrong
		return;


	HLOCAL handle = (HLOCAL)SendMessage(edit, EM_GETHANDLE, 0, 0);

	if( handle == 0 )
		// something wrong
		return;

	const char * buf = (const char*)LocalLock(handle);
	
	if( buf )
		GetParseString(buf, line);

	LocalUnlock(handle);
}


template<class ValueType>
void ParseString(ttmath::Parser<ValueType> & matparser)
{
	matparser.SetBase(base_input);
	matparser.SetDegRadGrad(angle_deg_rad_grad);
	matparser.SetFunctions(functions);
	matparser.SetVariables(variables);

	code = matparser.Parse(parse_string.c_str());

	calculated = matparser.Calculated();
}


void SetParameters()
{
	base_input         = GetPrgRes()->GetBaseInput();
	base_output        = GetPrgRes()->GetBaseOutput();
	always_scientific  = GetPrgRes()->GetDisplayAlwaysScientific();
	when_scientific    = GetPrgRes()->GetDisplayWhenScientific();
	rounding           = GetPrgRes()->GetDisplayRounding();
	precision          = GetPrgRes()->GetPrecision();
	remove_zeroes      = GetPrgRes()->GetRemovingZeroes();
	angle_deg_rad_grad = GetPrgRes()->GetDegRadGrad();
	country            = GetPrgRes()->GetLanguages()->GetCurrentLanguage();

	if( GetPrgRes()->GetDecimalPoint() == 0 )
		decimal_point = '.';
	else
		decimal_point = ',';

	variables = GetPrgRes()->GetVariables();
	functions = GetPrgRes()->GetFunctions();
}

	
void ParseString()
{
	if( parse_string.empty() )
		return;
	
	SetParameters();

	try
	{
	#ifndef TTCALC_PORTABLE

		switch( precision )
		{
		case 0:
			ParseString(parser1);
			break;

		case 1:
			ParseString(parser2);
			break;

		default:
			ParseString(parser3);
			break;
		}

	#else
		ParseString(parser1);
	#endif
	}
	catch(...)
	{
		code = ttmath::err_internal_error;
	}


	if( code==ttmath::err_ok && calculated )
		PutResult();
	else
	if( code==ttmath::err_overflow )
		PutOverflowMsg();
}


LRESULT EditReturnPressed(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
DWORD sel_start, sel_end;

	SendMessage(edit, EM_GETSEL, (WPARAM)&sel_start, (LPARAM)&sel_end);
		
	if( sel_start != sel_end )
		// something is selected
		return CallWindowProc(old_edit_proc, hwnd, msg, wParam, lParam);

	// putting the ENTER
	LRESULT res = CallWindowProc(old_edit_proc, hwnd, msg, wParam, lParam);

	GetParseString();
	ParseString();

return res;
}



LRESULT EditSubclass(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
	switch( msg )
	{
	case WM_CHAR:
		if( wParam == VK_RETURN )
		{
			return EditReturnPressed(hwnd, msg, wParam, lParam);
		}
		break;
	}

return CallWindowProc(old_edit_proc, hwnd, msg, wParam, lParam);
}




LRESULT PadCreate(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
	edit = CreateWindow("edit", "",
			WS_VISIBLE | WS_CHILD | WS_VSCROLL | ES_MULTILINE | ES_AUTOVSCROLL,
			0, 0, 100, 100, hwnd, 0, GetPrgRes()->GetInstance(), 0);

	if( !edit )
		return 0;

	old_edit_proc = (WNDPROC)SetWindowLong(edit, GWL_WNDPROC, (LONG)EditSubclass);

	// 65535 - 64KB 
	// we're using some kind of messages which operates only on 64KB
	SendMessage(edit, EM_SETLIMITTEXT, 65535 - 5, 0);

	if( font != 0 )
		SendMessage(edit, WM_SETFONT, (WPARAM)font, 0);

return 0;
}


LRESULT PadMove(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
RECT r;

	GetWindowRect(hwnd,&r);

	GetPrgRes()->SetPadXPos( r.left );
	GetPrgRes()->SetPadYPos( r.top );

return 0;
}


LRESULT PadSize(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
// client coordinates
int cx = LOWORD(lParam);
int cy = HIWORD(lParam);
int fwSizeType = int(wParam);
RECT r;


	if( fwSizeType == SIZE_MAXIMIZED )
		GetPrgRes()->SetPadMaximized(true);
	else
	if( fwSizeType == SIZE_RESTORED )
		GetPrgRes()->SetPadMaximized(false);

	MoveWindow(edit, 0, 0, cx, cy, true);

	if( fwSizeType != SIZE_MINIMIZED && fwSizeType != SIZE_MAXIMIZED )
	{
		GetWindowRect(hwnd, &r);
		GetPrgRes()->SetPadXSize( r.right - r.left );
		GetPrgRes()->SetPadYSize( r.bottom - r.top );
	}

return 0;
}



LRESULT PadClose(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
	GetPrgRes()->ShowPad( false );

return 0;
}


LRESULT PadFocus(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
	SetFocus(edit);

return 0;
}


void CreatePadMessagesTable(Messages<LRESULT> & messages)
{
	messages.Associate(WM_CREATE,   PadCreate);
	messages.Associate(WM_MOVE,		PadMove);
	messages.Associate(WM_SIZE,     PadSize);
	messages.Associate(WM_CLOSE,    PadClose);
	messages.Associate(WM_SETFOCUS, PadFocus);
}


LRESULT CALLBACK WindowPadProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
static Messages<LRESULT> messages;
bool method_exists;
LRESULT res;

	if( messages.Empty() )
		// initiation
		CreatePadMessagesTable(messages);

	res = messages.Call(msg, hwnd, msg, wParam, lParam, &method_exists);

	if( !method_exists )
		return DefWindowProc(hwnd, msg, wParam, lParam);

return res;
}



ATOM RegisterPadClass(const char * ttcalc_pad_class_name)
{
WNDCLASS w;

	w.style         = 0;
	w.lpfnWndProc   = WindowPadProc;
	w.cbClsExtra    = 0;
	w.cbWndExtra    = 0;
	w.hInstance     = GetPrgRes()->GetInstance();
	w.hIcon         = LoadIcon(GetPrgRes()->GetInstance(), MAKEINTRESOURCE(IDI_ICON2));
	w.hCursor       = 0;
	w.hbrBackground = (HBRUSH)(COLOR_BACKGROUND+1);
	w.lpszMenuName  = 0;
	w.lpszClassName = ttcalc_pad_class_name;

return RegisterClass(&w);
}


} // namespace Pad





bool CreatePadWindow()
{
using namespace Pad;

static char ttcalc_pad_class_name[] = "TTCalcPadWindow";
ATOM a = RegisterPadClass(ttcalc_pad_class_name);

	if( a == 0 )
		return false;

	bool pad_maximized_from_file = GetPrgRes()->GetPadMaximized();
	// CreateWindow() would change maximizing

	font = CreateFont(0, 0, 0, 0, FW_NORMAL, false, false, false,
					  ANSI_CHARSET, OUT_DEFAULT_PRECIS, CLIP_DEFAULT_PRECIS,
					  DEFAULT_QUALITY, DEFAULT_PITCH, "Ms Shell Dlg");


	HWND pad = CreateWindowEx(0, ttcalc_pad_class_name,
				"Pad",
				WS_OVERLAPPEDWINDOW | WS_POPUPWINDOW ,
				GetPrgRes()->GetPadXPos(), GetPrgRes()->GetPadYPos(),
				GetPrgRes()->GetPadXSize(), GetPrgRes()->GetPadYSize(),
				0 /*GetPrgRes()->GetMainWindow()*/, 0, GetPrgRes()->GetInstance(), 0);

	GetPrgRes()->SetPadWindow(pad);
	GetPrgRes()->SetPadMaximized( pad_maximized_from_file );
	GetPrgRes()->ShowPad( GetPrgRes()->IsPadVisible() );

return pad!=0 && edit!=0;
}


void DestroyPadWindow()
{
using namespace Pad;

	DeleteObject(font);
}