/***************************************************************************

	form.c

	form description translator

	(c) 2000-2007 Benoit Minisini <gambas@users.sourceforge.net>

	This program is free software; you can redistribute it and/or modify
	it under the terms of the GNU General Public License as published by
	the Free Software Foundation; either version 1, or (at your option)
	any later version.

	This program is distributed in the hope that it will be useful,
	but WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
	GNU General Public License for more details.

	You should have received a copy of the GNU General Public License
	along with this program; if not, write to the Free Software
	Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

***************************************************************************/

#define __GBC_FORM_C

#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <fcntl.h>
#include <ctype.h>

#include <sys/stat.h>
#include <sys/types.h>

#include <unistd.h>

#include "gb_common.h"
#include "gb_error.h"
#include "gb_limit.h"
#include "gb_file.h"
#include "gb_str.h"
#include "gbc_compile.h"
#include "gbc_chown.h"
#include "gbc_form.h"

/*#define DEBUG*/

static const char *_source;
static const char *_current;

static FORM_PARENT form_parent[MAX_FORM_PARENT];
static int form_parent_level;

static bool _no_trim = FALSE;

#if 0
static void print_fmt(const char *fmt, ...)
{
	va_list args;
	int len;
	char buffer[256];

	va_start(args, fmt);

	if (JOB->verbose)
	{
		vprintf(fmt, args);
		va_start(args, fmt);
	}

	len = vsnprintf(buffer, sizeof(buffer), fmt, args);
	if (len < 0)
		ERROR_panic("FORM_do: too short buffer");

	BUFFER_add(&JOB->source, buffer, len);
}
#endif

static void print_len(const char *buffer, int len)
{
	if (JOB->verbose)
		printf("%.*s", len, buffer);

	BUFFER_add(&JOB->source, buffer, len);
}


static void print(const char *buffer)
{
	if (JOB->verbose)
		printf("%s", buffer);
	BUFFER_add(&JOB->source, buffer, strlen(buffer));
}


static void print_fmt(const char *before, const char *word, int len, const char *after)
{
	print(before);
	print_len(word, len);
	print(after);
}

static boolean read_line(const char **str, int *len)
{
	const char *start;
	const char *nospace;
	unsigned char car;

	if (_no_trim)
	{
		car = *_current;
		if (!car)
			return TRUE;
	}
	else
	{
		for(;;)
		{
			car = *_current;
			if (!car)
				return TRUE;
			if (car > ' ')
				break;
			
			_current++;
		}
	}

	start = nospace = _current;
	for(;;)
	{
		car = *_current++;
		if (car == '\n' || car =='\r' || !car)
			break;
		if (car > ' ')
			nospace = _current;
	}

	*str = start;
	*len = (int)(nospace - start);
	return FALSE;
}


static char *get_word(const char **str, int *len)
{
	char car;
	const char *pos;

	*len = 0;

	for(;;)
	{
		car = **str;
		if (car == '\n')
			return NULL;
		if (!isspace(car))
			break;
		(*str)++;
	}

	pos = *str;

	for(;;)
	{
		car = **str;
		if (isspace(car))
			break;
		(*str)++;
		(*len)++;
	}

	return (char *)pos;
}


static void parent_enter(const char *str, int len)
{
	if (form_parent_level >= MAX_FORM_PARENT)
		THROW("&1: too many nested containers", JOB->form);

	form_parent[form_parent_level].name = (char *)str;
	form_parent[form_parent_level].len = len;
	form_parent_level++;
}


static void parent_leave(void)
{
	if (form_parent_level == 0)
		THROW("&1: syntax error", JOB->form);

	form_parent_level--;
}


static void parent_get(char **str, int *len, int add)
{
	if (form_parent_level < add)
	{
		*str = NULL;
		*len = 0;
	}
	else
	{
		*str = form_parent[form_parent_level - add].name;
		*len = form_parent[form_parent_level - add].len;
	}
}


static void get_container(char **str, int *len)
{
	parent_get(str, len, 2);
}

static void get_current(char **str, int *len)
{
	parent_get(str, len, 1);
}

static void save_action()
{
	FILE *file;
	const char *path;
	char *name;
	const char *line;
	int len;
	
	path = FILE_cat(FILE_get_dir(COMP_project), ".action", NULL);
	mkdir(path, 0777);
	
	name = STR_copy(FILE_set_ext(FILE_get_name(JOB->form), "action"));
	path = FILE_cat(FILE_get_dir(COMP_project), ".action", name, NULL);
	
	if (JOB->verbose)
		fprintf(stderr, "Writing action file %s\n", path);
	
	file = fopen(path, "w");
	if (!file)
		THROW("Cannot create action file: &1", path);

	fputs("# Gambas Action File 3.0\n", file);

	_no_trim = TRUE;
	while (!read_line(&line, &len))
	{
		fwrite(line, sizeof(char), len, file);
		putc('\n', file);
	}
	_no_trim = FALSE;

	if (fclose(file))
		THROW("Cannot create action file: &1", path);
		
	FILE_set_owner(path, COMP_project);
	
	
	STR_free(name);
}

char *FORM_get_file(const char *file)
{
	char *form;

	if (strcmp(FILE_get_ext(file), "class"))
		return NULL;

	/*form = STR_cat(file, ".desc", NULL);*/
	form = STR_copy(FILE_set_ext(file, "form"));
	if (!FILE_exist(form))
	{
		STR_free(form);
		return NULL;
	}
	else
		return form;
}



static boolean FORM_init(void)
{
	BUFFER_create(&_source);
	BUFFER_load_file(&_source, JOB->form);
	BUFFER_add(&_source, "\n\0", 2);
	_current = _source;
	return FALSE;
}


static void FORM_exit(void)
{
	BUFFER_delete(&_source);
}


PUBLIC void FORM_do(bool ctrl_public)
{
	const char *line;
	char *word;
	char *win = NULL;
	char *twin = NULL;

	int len, len_win, len_twin;
	const char *pos_rewind;
	bool virtual;

	if (JOB->form == NULL)
		return;

	FORM_init();

	/* version */

	if (read_line(&line, &len))
		goto _ERROR;

	if (strncasecmp(line, "# Gambas Form File 3.0", len))
		THROW("Bad form file version");

	pos_rewind = _current;
	form_parent_level = 0;

	print("#SECTION\n");

	while (!read_line(&line, &len))
	{
		if (len == 0 || *line == '#' || *line == '\'')
			continue;

		if (*line == '{')
		{
			form_parent_level++;
			line++;

			word = get_word(&line, &len);
			if (word == NULL)
				goto _ERROR;

			if (win != NULL)
			{
				if (ctrl_public)
					print("PUBLIC");
				else
					print("PRIVATE");

				//print_fmt(" {%.*s} ", len, word);
				print_fmt(" {", word, len, "} ");
			}

			if (win == NULL)
			{
				win = word;
				len_win = len;
			}

			word = get_word(&line, &len);
			if (word == NULL)
				goto _ERROR;

			if (twin != NULL)
			{
				if (*word == '#')
				{
					word++;
					len--;
				}
				//print_fmt("AS %.*s\n", len, word);
				print_fmt("AS ", word, len, "\n");
			}

			if (twin == NULL)
			{
				twin = word;
				len_twin = len;

				//print_fmt("INHERITS %.*s\n\n", len_twin, twin);
				print_fmt("INHERITS ", twin, len_twin, "\n\n");
			}
		}
		else if (*line == '}')
		{
			form_parent_level--;
			if (form_parent_level <= 0)
				break;
		}
	}

	/*
	if (type != FT_NORMAL)
		stat = "Static ";
	else
		stat = "";

	if (type != FT_NORMAL)
		print("Static Private _%.*s As %s\n", len_win, win, JOB->class->name);

	print("%sPrivate _%.*sId As Integer\n\n", stat, len_win, win);
	*/

	print("\nPUBLIC SUB {$load}()\n\n");

	_current = pos_rewind;
	form_parent_level = 0;

	while (!read_line(&line, &len))
	{
		if (len == 0 || *line == '#' || *line == '\'')
			continue;

		if (*line == '{')
		{
			line++;

			word = get_word(&line, &len);
			if (word == NULL)
				goto _ERROR;

			if (form_parent_level == 0)
			{
				parent_enter("ME", 2);
				print("  WITH ME\n");
			}
			else
			{
				//print_fmt("  {%.*s} = NEW ", len, word);
				print_fmt("  {", word, len, "} = NEW ");
				parent_enter(word, len);

				word = get_word(&line, &len);
				if (word == NULL)
					goto _ERROR;

				if (*word == '#')
				{
					virtual = TRUE;
					word++;
					len--;
				}
				else
					virtual = FALSE;

				//print_fmt("%.*s", len, word);
				print_len(word, len);

				if (!virtual)
				{
					get_container(&word, &len);
					//print_fmt("(%.*s)", len, word);
					print_fmt("(", word, len, ")");
				}

				word = get_word(&line, &len);
				if (word == NULL)
					get_current(&word, &len);

				//print_fmt(" AS \"%.*s\"\n", len, word);
				print_fmt(" AS \"", word, len, "\"\n");

				get_current(&word, &len);
				//print_fmt("  WITH {%.*s}\n", len, word);
				print_fmt("  WITH {", word, len, "}\n");
			}
		}
		else if (*line == '}')
		{
			print("  END WITH\n");
			parent_leave();
			if (form_parent_level == 0)
				break;
		}
		else
		{
			/*get_current(&word, &len_word);*/
			/*print("  %.*s", len_word, word);*/
			print("    .");
			print_len(line, len);
			print("\n");
		}
	}

	if (form_parent_level > 0)
		goto _ERROR;

	print("\nEND\n\n");

	// Create the action file if needed
	
	while (!read_line(&line, &len))
	{
		if (!strncasecmp(line, "# Gambas Action File 3.0", len))
		{
			save_action();
			break;
		}
	}

	FORM_exit();
	return;

_ERROR:

	THROW("&1: syntax error in form file", JOB->form);
}