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/* wydawca - automatic release submission daemon
   Copyright (C) 2007, 2010-2013 Sergey Poznyakoff

   Wydawca 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 3 of the License, or (at your
   option) any later version.

   Wydawca 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 wydawca. If not, see <http://www.gnu.org/licenses/>. */

#include "wydawca.h"
#include "sql.h"
#include "builtin.h"

struct dictionary_descr {
	const char *name;

	int (*init) (struct dictionary *);
	int (*done) (struct dictionary *);
	int (*free) (struct dictionary *, void *);

	void *(*open) (struct dictionary *);
	int (*close) (struct dictionary *, void *);

	int (*get) (struct dictionary *, void *, unsigned, unsigned);
	int (*lookup) (struct dictionary *, void *, const char *);
	int (*quote) (struct dictionary *, void *, const char *, char **,
		      size_t *);
};

static struct dictionary_descr dictionary_tab[] = {
	{ "none", NULL, NULL, NULL, NULL, NULL, NULL, NULL},
	{ "sql", sql_init_dictionary, sql_done_dictionary, sql_free_result,
	  sql_open, NULL, sql_get_dictionary, sql_lookup_dictionary,
	  sql_quote },
	{ "builtin", builtin_init, builtin_done, builtin_free_result,
	  builtin_open, NULL,
	  builtin_get,
	  builtin_lookup },
	{ "external", NULL, NULL, NULL, NULL, NULL, NULL, NULL }
};

struct dictionary *
dictionary_new(enum dictionary_id id, enum dictionary_type type)
{
	struct dictionary *mp = grecs_zalloc(sizeof mp[0]);
	mp->id = id;
	mp->type = type;
	return mp;
}

int
dictionary_init(struct dictionary *dict)
{
	struct dictionary_descr *mp = dictionary_tab + dict->type;
	int rc = 0;

	if (dict->init_passed++)
		return 0;
	if (wy_debug_level > 1) {
		int i;
		wy_log(LOG_DEBUG, _("initializing dictionary: %s \"%s\""),
		       mp->name, SP(dict->query));
		for (i = 0; i < dict->parmc; i++)
			wy_log(LOG_DEBUG, " parmv[%d]=%s", i, dict->parmv[i]);
	}
	if (mp->init)
		rc = mp->init(dict);
	if (rc == 0)
		dict->init_passed = 1;
	return rc;
}

void *
dictionary_open(struct dictionary *dict)
{
	struct dictionary_descr *mp = dictionary_tab + dict->type;

	if (!mp->open)
		return NULL;
	return mp->open(dict);
}

int
dictionary_close(struct dictionary *dict, void *handle)
{
	struct dictionary_descr *mp = dictionary_tab + dict->type;
	if (mp->free)
		mp->free(dict, handle);
	if (!mp->close)
		return 0;
	return mp->close(dict, handle);
}

int
dictionary_done(struct dictionary *dict)
{
	struct dictionary_descr *mp = dictionary_tab + dict->type;
	int rc = 0;

	if (dict->init_passed == 0)
		return 0;
	if (--dict->init_passed)
		return 0;
	if (wy_debug_level > 1) {
		int i;
		wy_log(LOG_DEBUG, _("closing dictionary: %s \"%s\""),
		       mp->name, SP(dict->query));
		for (i = 0; i < dict->parmc; i++)
			wy_log(LOG_DEBUG, " parmv[%d]=%s", i, dict->parmv[i]);
	}
	if (mp->done)
		rc = mp->done(dict);
	free(dict->result);
	dict->result = NULL;
	dict->result_size = 0;
	return rc;
}

int
dictionary_lookup(struct dictionary *dict, void *handle, const char *cmd)
{
	struct dictionary_descr *mp = dictionary_tab + dict->type;

	if (cmd)
		wy_debug(2, (_("dictionary lookup: %s \"%s\""),
			     mp->name, cmd));
	else
		wy_debug(2, (_("dictionary lookup: %s"),
			     mp->name));

	if (!dict->init_passed) {
		wy_log(LOG_CRIT,
		       _("INTERNAL ERROR: "
			 "dictionary %s \"%s\" not initialized"),
		       mp->name, SP(dict->query));
		return 1;
	}
	if (!mp->lookup) {
		wy_log(LOG_CRIT,
		       _("INTERNAL ERROR: "
			 "no lookup function for dictionary %s \"%s\""),
		       mp->name, SP(dict->query));
		return 1;
	}
	if (mp->free)
		mp->free(dict, handle);
	return mp->lookup(dict, handle, cmd);
}

unsigned
dictionary_num_rows(struct dictionary *dict)
{
	return dict->nrow;
}

unsigned
dictionary_num_cols(struct dictionary *dict)
{
	return dict->ncol;
}

const char *
dictionary_result(struct dictionary *dict, void *handle,
		  unsigned nrow, unsigned ncol)
{
	struct dictionary_descr *mp = dictionary_tab + dict->type;

	if (nrow >= dict->nrow || ncol >= dict->ncol
	    || mp->get(dict, handle, nrow, ncol))
		return NULL;
	return dict->result;
}

void
dictionary_copy_result(struct dictionary *dict, const char *res, size_t size)
{
	if (dict->result_size < size + 1) {
		dict->result_size = size + 1;
		dict->result = grecs_realloc(dict->result, dict->result_size);
	}
	memcpy(dict->result, res, size);
	dict->result[size] = 0;
}

/* Quote non-printable characters in INPUT. Point *OUTPUT to the malloc'ed
   quoted string. Return its length. */
int
dictionary_quote_string(struct dictionary *dict, void *handle,
			const char *input, char **poutput, size_t * psize)
{
	struct dictionary_descr *mp = dictionary_tab + dict->type;
	size_t size;
	int quote;
	char *output;

	if (!input) {
		*poutput = grecs_malloc(1);
		(*poutput)[0] = 0;
		*psize = 1;
		return 0;
	}

	if (mp->quote)
		return mp->quote(dict, handle, input, poutput, psize);

	size = wordsplit_c_quoted_length(input, 0, &quote);
	output = grecs_malloc(size + 1);
	wordsplit_c_quote_copy(output, input, 0);
	output[size] = 0;

	*poutput = output;
	if (psize)
		*psize = size;
	return 0;
}

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