/* Copyright (c) 1994 by Sanjay Ghemawat */
/*
 * Behaves like Tk main routine if display can be opened, otherwise
 * like the Tcl main routine.  The following control whether or not
 * Tk is used --
 *
 *	$DISPLAY in environment			Use Tk
 *	-display				Use Tk
 *	-list					Do not use Tk
 *	-show					Do not use Tk
 *	-print					Do not use Tk
 *	-nodisplay				Do not use Tk
 *
 * The "-f" flag can be used to pass in an initialization script regardless
 * of whether or not Tk is used.
 *
 * All .tcl files from Tcl/Tk libraries are linked into the executable
 * as well to avoid depending on external files being installed correctly.
 */

#include <stdlib.h>
#include <string.h>
#include <tcl.h>
#include <tk.h>
#include "ical.h"

/* Include various libraries converted to strings. */

#ifdef STANDALONE
static char* tcl_lib_str[] = {
#include "tcl_lib.gen"
0
};

// Need to disable "source" command
static char* tk_lib_str[] = {
"rename source _orig_source",
"proc source {args} {}",
#include "tk_lib.gen"
"rename source {}",
"rename _orig_source source",
0
};

static char* ical_lib_str[] = {
#include "ical_lib.gen"
0
};

static char* tcllib_str[] = {
#include "tcllib.gen"
0
};
#endif

static char* ical_startup[] = {
#include "ical_start.gen"
0
};

static char* psheader_str[] = {
"set ical(psheader) {%!PS-Adobe-",
#include "psheader.gen"
"}",
0
};

static char* ical_doc_str[] = {
"set ical(doc) {",
#include "icaldoc.gen"
"}",
0
};

static char* tcl_doc_str[] = {
"set ical(tcl_interface_doc) {",
#include "tcldoc.gen"
"}",
0
};

#include "bitmaps/left.xbm"
#include "bitmaps/right.xbm"
#include "bitmaps/todo.xbm"
#include "bitmaps/done.xbm"
#include "bitmaps/sleft.xbm"
#include "bitmaps/dleft.xbm"
#include "bitmaps/sright.xbm"
#include "bitmaps/dright.xbm"
#include "bitmaps/ical.xbm"

// Is Tk available?
static int have_tk;

// Was a script specified on the command line?
static int have_script;

static int eval_list(Tcl_Interp*, char** list);
static int app_init(Tcl_Interp*);
extern int Ical_Init(Tcl_Interp*);

int
main(int argc, char* argv[]) {
    // XXX Hacky scanning of argument list to figure out whether
    // or not Tk is needed, and also if a script is specified on the
    // command line.

    have_script = 0;
    have_tk = (getenv("DISPLAY") != 0);

    int i;
    for (i = 1; i < argc; i++) {
	if (strcmp(argv[i], "-display") == 0) {
	    have_tk = 1;
	    continue;
	}
	if (strcmp(argv[i], "-list") == 0) {
	    have_tk = 0;
	    continue;
	}
	if (strcmp(argv[i], "-show") == 0) {
	    have_tk = 0;
	    continue;
	}
	if (strcmp(argv[i], "-print") == 0) {
	    have_tk = 0;
	    continue;
	}
	if (strcmp(argv[i], "-nodisplay") == 0) {
	    have_tk = 0;
	    continue;
	}
	if ((strcmp(argv[i], "-f") == 0) || (strcmp(argv[i], "-file") == 0)) {
	    have_script = 1;
	    continue;
	}
    }

    // Strip out processed "-nodisplay" arguments
    int j = 1;
    for (i = 1; i < argc; i++) {
	if (strcmp(argv[i], "-nodisplay") == 0) continue;
	argv[j++] = argv[i];
    }
    argv[j] = 0;
    argc = j;

    if (!have_tk && have_script) {
	// If a "-f <script>" is present on the command line,
	// strip out the "-f" because tclMain does not understand it.
	for (i = 1; i < argc-1; i++) {
	    if ((strcmp(argv[i],"-f") != 0) && (strcmp(argv[i],"-file") != 0))
		continue;

	    /* Slide the rest of the arguments over */
	    /* (including the NULL in argv[argc].   */

	    for (int j = i+1; j <= argc; j++)
		argv[j-1] = argv[j];
	    argc--;
	    break;
	}
    }


    if (have_tk)
	Tk_Main(argc, argv, app_init);
    else
	Tcl_Main(argc, argv, app_init);

    return 0;
}

#ifdef STANDALONE
extern "C" int MyTcl_Init(Tcl_Interp* tcl) {
    return (eval_list(tcl, tcl_lib_str));
}
#else
#define MyTcl_Init Tcl_Init
#endif

/* XXX We need to replace TkPlatformInit */
#ifdef STANDALONE
extern "C" void TkCreateXEventSource();
extern "C" int TkPlatformInit(Tcl_Interp* tcl) {
    char* libDir = Tcl_GetVar(tcl, "tk_library", TCL_GLOBAL_ONLY);
    if (libDir == NULL) {
	libDir = getenv("TK_LIBRARY");
	if (libDir == NULL) {
	    libDir = "/unknown";
	}
	Tcl_SetVar(tcl, "tk_library", libDir, TCL_GLOBAL_ONLY);
    }

    TkCreateXEventSource();

    return (eval_list(tcl, tk_lib_str));
}
#endif

static int app_init(Tcl_Interp* tcl) {
    if (MyTcl_Init(tcl) != TCL_OK) return TCL_ERROR;
    if (have_tk && (Tk_Init(tcl) != TCL_OK)) return TCL_ERROR;
    if (Ical_Init(tcl) != TCL_OK) return TCL_ERROR;

    if (!have_script) {
	// Perform default initialization
	if (have_tk) {
	    if (Tcl_Eval(tcl, "ical_tk_script") == TCL_ERROR)
		return TCL_ERROR;

	    // Do not bother returning to tkMain because it
	    // will try to read from standard input.

	    Tk_MainLoop();
	    Tcl_Eval(tcl, "exit");
	    exit(1);
	}

	// Default tcl code
	return Tcl_Eval(tcl, "ical_no_tk_script");
    }

    return TCL_OK;
}

// Macro to create a Tk bitmap.  Returns true iff successfull.
#define MAKE_BITMAP(tcl,id,n) \
(Tk_DefineBitmap(tcl,Tk_GetUid(id),n##_bits,n##_width,n##_height) == TCL_OK)

int Ical_Init(Tcl_Interp* tcl) {
    if (have_tk) {
	/* Load necessary Tk support code */
	Tk_Window mainWindow = Tk_MainWindow(tcl);

	if (!MAKE_BITMAP(tcl, "left_arrow",	left))    return TCL_ERROR;
	if (!MAKE_BITMAP(tcl, "right_arrow",	right))   return TCL_ERROR;
	if (!MAKE_BITMAP(tcl, "todo_box",	todo))    return TCL_ERROR;
	if (!MAKE_BITMAP(tcl, "done_box",	done))    return TCL_ERROR;
	if (!MAKE_BITMAP(tcl, "single_left",	sleft))   return TCL_ERROR;
	if (!MAKE_BITMAP(tcl, "double_left",	dleft))   return TCL_ERROR;
	if (!MAKE_BITMAP(tcl, "single_right",	sright))  return TCL_ERROR;
	if (!MAKE_BITMAP(tcl, "double_right",	dright))  return TCL_ERROR;
	if (!MAKE_BITMAP(tcl, "ical_icon",	ical))    return TCL_ERROR;
    }

    // Set-up postscript prolog
    if (eval_list(tcl, psheader_str) != TCL_OK)
	return TCL_ERROR;

    // Set-up documentation
    if (eval_list(tcl, ical_doc_str) != TCL_OK)
	return TCL_ERROR;
    if (eval_list(tcl, tcl_doc_str) != TCL_OK)
	return TCL_ERROR;

    // Non-Tk ical commands
    Tcl_CreateCommand(tcl, "calendar",     Cmd_CreateCalendar,	NULL, NULL);
    Tcl_CreateCommand(tcl, "notice",       Cmd_CreateNotice,	NULL, NULL);
    Tcl_CreateCommand(tcl, "appointment",  Cmd_CreateAppt,	NULL, NULL);
    Tcl_CreateCommand(tcl, "date",         Cmd_Date,		NULL, NULL);
    Tcl_CreateCommand(tcl, "ical_time",    Cmd_Time,		NULL, NULL);
    Tcl_CreateCommand(tcl, "de_monthdays", Cmd_MonthDays,	NULL, NULL);
    Tcl_CreateCommand(tcl, "hilite_loop",  Cmd_HiliteLoop,	NULL, NULL);
    Tcl_CreateCommand(tcl, "ical_expand_file_name", Cmd_ExpandFileName, 0, 0);

#ifdef STANDALONE
    // Load tcllib files
    if (eval_list(tcl, tcllib_str) != TCL_OK)
	return TCL_ERROR;

    // Load ical library files
    if (eval_list(tcl, ical_lib_str) != TCL_OK)
	return TCL_ERROR;
#endif

    // Initialize ical stuff
    if (eval_list(tcl, ical_startup) != TCL_OK)
	return TCL_ERROR;

    if (Tcl_Eval(tcl, "ical_init") == TCL_ERROR)
	return TCL_ERROR;

    return TCL_OK;
}

// Concatenate list of lines into one string and "Tcl_Eval" it.
static int eval_list(Tcl_Interp* tcl, char** list) {
    // Get buffer size
    int i;
    int count = 0;
    for (i = 0; list[i] != 0; i++) {
	count += strlen(list[i]);
	count++;			// Space for newline
    }

    // Copy lines into buffer
    int index = 0;
    char* buf = new char[count+1];
    for (i = 0; list[i] != 0; i++) {
	strcpy(buf+index, list[i]);
	index += strlen(list[i]);
	buf[index] = '\n';
	index++;
    }
    buf[index] = '\0';

    int result = Tcl_Eval(tcl, buf);
    delete [] buf;
    return result;
}