#ifndef _COMMON_H
#define _COMMON_H

#define TRUE 1
#define FALSE 0

#define ALLOC farmalloc
#define FREEMEM farfree

#define DEBUG 0

#include <stdio.h>
#include <alloc.h>
#include <stdlib.h>
#include <conio.h>
#include <time.h>
#include <graphics.h>
#include <dos.h>
#include <bios.h>
#include "menu.h"
#include "ui.h"
#include "music.h"
#include "keyboard.h"

void CheckAlloc(void *);
/* Check if an allocation completed successfully */

void DoNothing(void *);
/* Just an ugly wordaround to remove some warnings */

void InitGraph(void *);
/* Function to init graphics driver */

void ClearGraph(void *);
/* Function to clear screen */

struct _Char
/* Struct of a char */
{
    struct _Char *next;
    /* pointer to left or right one */
    char ch;
};
typedef struct _Char Char;

struct _Row
/* Struct of a row */
{
    struct _Row *next;
    /* pointer to up or down row */
    Char *ch;
};
typedef struct _Row Row;

struct _MouseState
/* Struct to save a mouse state */
{
    int x, y;
    /* Saving where the mouse is */

    int key;
    /* Saving if a button is pressed (0: None, 1: Left, 2: Right) */

    int release;
    /* Saving if a button is released (0: None, 1: Left, 2: Right) */
};
typedef struct _MouseState MouseState;

struct _KeyMap
/* Struct to save the alphabets' keys */
{
    int chs[26];
};
typedef struct _KeyMap KeyMap;

struct _NumMap
/* Struct to save the numbers' keys */
{
    int num[10];
};
typedef struct _NumMap NumMap;

struct _State
/* Main state structure */
{
    MouseState mouse;
    /* Saving the current mouse state */

    KeyboardState keyboard;
    /* Saving the current keyboard state */

    char isexit;
    /* Saving the main exit flag */

    FormMenu *menu;
    /* Saving pointer to form menus */

    Menu *contextmenu;
    /* Saving pointer to the context menu */

    int iscontextmenu, cmmousex, cmmousey;
    /* Saving context menu related states */

    KeyBinding *keybinding;
    /* Saving pointer to all key binding definitions */

    Event *redraw;
    /* Event of redrawing */

    char isclearmenu;
    /* Flag to save clear menu state */

    char iskeyboard;
    /* Flag to save if the menu is operating by mouse or by keyboard */

    int ischildwindow, childx1, childy1, childx2, childy2;
    /* Saving child window related properties */

    char dotted, highlight;
    /* The main text box related properties */

    char isdrag;
    /* Flag of dragging child window */

    char ischosen;
    /* Flag of drag-to-choose mode */

    int startrow, startchar, endrow, endchar;
    /* Chosen area flags (the head and the rear locations ) */

    char isedit, chinese, fullwidth, chipunc;
    /* Chinese-input related states */

    int editx1, edity1, editx2, edity2;
    /* Currently available edit area flags */

    long delaytime;
    /* True delay time for adjusting delay() */

    Row *filehead, *childhead, *childhead2;
    /* File head pointers to save the main text and child texts */

    Row *cutboard;
    /* Clipboard pointer */

    Char *searchstring;
    /* Search string pointer */

    char isreplace;
    /* Judging if in replacing mode */

    char *filename;
    /* Name of currently open file */

    int cursorx, cursory, iscursor;
    /* Location for the cursor */

    long cursortime;
    /* Time-stamp logged here */

    int pagemovecount, currentrow, currentcolumn, rowcount;
    /* Distance of current row */

    KeyMap map;
    NumMap nummap;
    /* Main key-mappings */

    FILE *hzkfile;
    /* Font file HZK16 */

    char page;
    char mousetype;
    char nothing;
    /* Some other flags */

    void *mousebuf;
    /* Buffer to save mouse-floating area contents */

    char ispinyin, pinyinpage, sheng, yun;
    /* Pinyin input method related temperate variables */

    Music curmusic;
    /* Current playing music */

    int isput,lastmsx,lastmsy;
};
typedef struct _State State;

void FREEMEMRow(Row *row);
/* Release all the memory that used by a row */

void FREEMEMChar(Char *ch);
/* Free link table struct Char */

void Exit(void *n);
/* Flag an exit event */

void CalcDelay(void *n);
/* Use biostime to adjust delay() */

void Delay(void *n, long t);
/* The fixed delay function */

/* Some key map definitions */
#define RIGHTSHIFT  0x01
#define LEFTSHIFT   0x02
#define CTRL        0x04
#define ALT         0x08

#define ESC       0x100
#define TAB       0xf00
#define NOMOD     0xff

#define ENTER     0x1c00
#define SPACE     0x3900
#define BACKSPACE 0x0e00
#define DELETE    0x5300

#define PAGEUP    0x4900
#define PAGEDOWN  0x5100
#define HOME      0x4700
#define CTRLHOME  0x7700
#define END       0x4f00
#define CTRLEND   0x7500

#define F1    0x3b00
#define F2    0x3c00
#define F3    0x3d00
#define F4    0x3e00
#define F5    0x3f00
#define F6    0x4000
#define F7    0x4100
#define F8    0x4200

#define UP    0x4800
#define DOWN  0x5000
#define LEFT  0x4b00
#define RIGHT 0x4d00

#define EQUAL 0xd00
#define MINUS 0xc00

#endif