//
//  Apple80.mm
//  2Term
//
//  Created by Kelvin Sherlock on 12/23/2010.
//  Copyright 2010 __MyCompanyName__. All rights reserved.
//

/*
 * See Apple IIe Tech Ref page 273.
 * See Apple IIgs Firmware Reference page 77
 * See Apple IIe Extended 80-Column TextCard (revision B) appendix C.
 *
 */

#import "Apple80.h"

#include <sys/ttydefaults.h>

#include "OutputChannel.h"
#include "Screen.h"
#include "algorithm.h"


%%{
    machine console;
    alphtype unsigned int;
    
    action nop {}
    
    action advance {
        // advance cursor
        if (++cursor.x == 80) {
            cursor.x = 0;
            if (cursor.y >= 24-1) {
                screen->scrollUp();
            } else cursor.y++;
        }
    }
    
    arg1 = any ${ _scratch[0] = (fc - 32); };
    arg2 = any ${ _scratch[1] = (fc - 32); };

    
    
    
    main := (
               0x00 $nop
             | 0x01 $nop
             | 0x02 $nop
             | 0x03 $nop
             | 0x04 $nop
             
             | 0x05 ${
                 /* E - $05 - Turns cursor on (enables cursor display) */
                 screen->setCursorType(Screen::CursorTypeUnderscore);
             }
             
             | 0x06 ${
                 /* F - $06 - Turns cursor off (disables cursor display) */
                 screen->setCursorType(Screen::CursorTypeNone);
             }
             
             | 0x07 ${
                 /* G - $07 - beep 1000 hz for .1 seconds. */
                 NSBeep();
             }
             
             | 0x08 ${
                 /* H - $08 - Moves cursor left one column; 
                  if cursor was at beginning of line, moves 
                  it to end of previous line
                  */

                 if (cursor.x) cursor.x--;
                 else {
                     cursor.x = 80-1;
                     // go up, possibly scrolling.
                     if (cursor.y) cursor.y--;
                 }
             }
             
             | 0x09 ${
                 // control-I
                 // tab -- todo, verify.
                 cursor.x = (cursor.x + 8) & ~7;
                 cursor.x = std::min(cursor.x, 79);
             }
             
             | 0x0a ${
                 /* J - $0A - Moves cursor down one row; scrolls if needed */

                 if (cursor.y >= 24-1) {
                     screen->scrollUp();
                 } else cursor.y++;
             
             }
             
             | 0x0b ${
                 /* K - $0B - Clears to end of screen */

                 iRect tmp;
                 tmp.origin = cursor;
                 tmp.size = iSize(80 - cursor.x, 1);
                 
                 screen->eraseRect(tmp);
                 
                 tmp = iRect(0, 0, 80, 24);
                 tmp.origin.y = cursor.y+1;
                 tmp.size.height -= cursor.y+1;
                 screen->eraseRect(tmp);
             
             }
             
             | 0x0c ${
                 // control-L
                 /* clear text port and home */
                 screen->eraseScreen();
                 cursor = iPoint(0,0);
             }
             
             | 0x0d ${
                 // control-M
                 /* carriage return */
                 // BASIC also moves to next line, PASCAL does not.
                 cursor.x = 0;
             }
             
             | 0x0e ${
                 // control-N
                 /* set normal display */
                 _context.clearFlagBit(Screen::FlagInverse);
             }
             
             | 0x0f ${
                 // control-O
                 /* set inverse display */
                 _context.setFlagBit(Screen::FlagInverse);
             }
             
             | 0x10 $nop
             
             | 0x11 ${ /* ^Q 40 column mode */ }
             | 0x12 ${ /* ^R 80 column mode */ }
             
             | 0x13 ${ /* ^S - stop listing until any keypress. */ }
             
             | 0x14 $nop
             
             | 0x15 ${
                 /* ^U - deactivate 80 column? */
             }
             
             | 0x16 ${ /* CTRL('V') */ screen->scrollDown(); }
             
             | 0x17 ${ /* CTRL('W') */ screen->scrollUp(); }
             
             | 0x18 ${
                 // CTRL('X'):
                 /* disable mouse text */
                 _context.clearFlagBit(Screen::FlagMouseText);
             }
             
             | 0x19 ${
                 // CTRL('Y'):
                 /* home cursor */
                 cursor = iPoint(0,0);
             }
             
             | 0x1a ${
                 // CTRL('Z'):
                 /* clear line */
                 iRect tmp;
                 tmp.origin = iPoint(0, cursor.y);
                 tmp.size = iSize(80, 1);
                 screen->eraseRect(tmp);
             }
             
             | 0x1b ${
                 // CTRL('['):
                 /* ^[ enable mouse text mapping */
                 _context.setFlagBit(Screen::FlagMouseText);
             }
             
             | 0x1c ${
                 // CTRL('\\'):
                 /* Moves cursor right one column; if at end of line, does Control-M */
                 // n.b. - BASIC ^M also moves to next line.
                 cursor.x++;
                 if (cursor.x == 80) cursor.x = 0;
             }
             
             | 0x1d ${
                 // CTRL(']'):
                 /* clear to end of line */
                 iRect tmp;
                 tmp.origin = cursor;
                 tmp.size = iSize(80 - cursor.x, 1);
                 
                 screen->eraseRect(tmp);
             }
             
             | 0x1e arg1 arg2 ${
                 // CTRL('^'):
                 /* goto x y */
                 // todo - verify behavior for illegal values.
                 cursor.x = clamp(_scratch[0], 0, 80 - 1);
                 cursor.y = clamp(_scratch[1], 0, 24 - 1);
             }
             
             | 0x1f ${
                 // CTRL('_'):
                 /* move cursor up */
                 if (cursor.y) cursor.y--;
             }
             
             | 0x20 .. 0x7f ${
                 screen->putc(fc, _context);
             } $advance
             
             | 0x80 .. 0x9f ${
                 /* uppercase inverse/normal */
                 uint8_t flag = ~(_context.flags & Screen::FlagInverse);
                 screen->putc(fc - 0x40, _context.cursor, flag);
             } $advance
             
             | 0xa0 .. 0xbf ${
                 /* special inverse/normal */
                 uint8_t flag = ~(_context.flags & Screen::FlagInverse);
                 screen->putc(fc - 0x80, _context.cursor, flag);
             } $advance
             
             | 0xc0 .. 0xdf ${
                 /* uppercase normal / mouse text. */
                 uint8_t flag = ~(_context.flags & Screen::FlagInverse);
                 if (flag) flag |= Screen::FlagMouseText;
                 screen->putc(fc - 0x80, _context.cursor, flag);
             } $advance
             
             | 0xe0 .. 0xff ${
                 /* special inverse/normal */
                 uint8_t flag = ~(_context.flags & Screen::FlagInverse);
                 screen->putc(fc - 0x80, _context.cursor, flag);
             } $advance
             
             )* $err{ fgoto main; };
    
    write data;
}%%

@implementation Apple80


+(void)load
{
    [EmulatorManager registerClass: self];
}

+(NSString *)name
{
    return @"Apple 80";
}

-(NSString *)name
{
    return @"Apple 80";
}

-(const char *)termName
{
    return "appleIIe";
}


-(void)reset
{

    %%write init;
    _context.window = iRect(0, 0, 80, 24);
    _context.cursor = iPoint(0,0);
    _context.flags = 0;
}

-(BOOL)resizable
{
    return NO;
}

-(struct winsize)defaultSize
{
    struct winsize ws = { 24, 80, 0, 0 };
    
    return ws;
}

-(void)initTerm: (struct termios *)term
{
    // Control-U is used by the up-arrow key.
    term->c_cc[VKILL] = CTRL('X');
}

-(id)init
{
    if ((self = [super init]))
    {
        [self reset];
    }
    
    return self;
}

-(void)processData:(const uint8_t *)data length: (size_t)length screen:(Screen *)screen output:(OutputChannel *)output
{
    
    const uint8_t *eof = nullptr;
    const uint8_t *p = data;
    const uint8_t *pe = data + length;
    
    auto &cursor = _context.cursor;
    %%write exec;
    screen->setCursor(cursor);
}


-(void)keyDown:(NSEvent *)event screen:(Screen *)screen output:(OutputChannel *)output
{
    NSEventModifierFlags flags = [event modifierFlags];
    NSString *chars = [event charactersIgnoringModifiers];
    
    NSUInteger length = [chars length];
    
    for (unsigned i = 0; i < length; ++i)
    {
        unichar uc = [chars characterAtIndex: i];
        
        switch (uc)
        {
            case NSEnterCharacter:
                output->write(CTRL('M'));
                break;
                /*    
                 case NSDeleteCharacter:
                 output->write(0x7f);
                 break;
                 */
            
                
                // the Apple II keyboard had a delete where the backspace key was.
                // it functions as a backspace key.
            case NSBackspaceCharacter:
                output->write(0x7f);
                break;
                
            case NSLeftArrowFunctionKey:
                output->write(CTRL('H'));
                break;
                
            case NSRightArrowFunctionKey:
                output->write(CTRL('U'));
                break;
                
            case NSUpArrowFunctionKey:
                output->write(CTRL('K'));
                break;
                
            case NSDownArrowFunctionKey:
                output->write(CTRL('J'));
                break;
                
                
            default:
                if (uc <= 0x7f)
                {
                    char c = uc;
                    
                    //NSLog(@"%@", event);
                    
                    if (flags & NSAlphaShiftKeyMask)
                    {
                        c = flags & NSShiftKeyMask  ? tolower(c) : toupper(c);
                    }
     
                    if (flags & NSControlKeyMask)
                        c = CTRL(c);
                    
                    output->write(c);
                }
                break;
        }
        
        
        
    }
}

@end