/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/*
 * Copyright (C) 1999-2008 Novell, Inc. (www.novell.com)
 *
 * Authors: Michael Zucchi <notzed@ximian.com>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of version 2 of the GNU Lesser General Public
 * License as published by the Free Software Foundation.
 *
 * 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 Lesser General Public
 * License along with this program; if not, write to the
 * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301, USA.
 */

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <ctype.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include "camel-imap-store-summary.h"

#define d(x)
#define io(x)			/* io debug */

#define CAMEL_IMAP_STORE_SUMMARY_VERSION_0 (0)

#define CAMEL_IMAP_STORE_SUMMARY_VERSION (0)

static gint summary_header_load (CamelStoreSummary *, FILE *);
static gint summary_header_save (CamelStoreSummary *, FILE *);

/*static CamelStoreInfo * store_info_new(CamelStoreSummary *, const gchar *);*/
static CamelStoreInfo * store_info_load (CamelStoreSummary *, FILE *);
static gint		 store_info_save (CamelStoreSummary *, FILE *, CamelStoreInfo *);
static void		 store_info_free (CamelStoreSummary *, CamelStoreInfo *);

static const gchar *store_info_string (CamelStoreSummary *, const CamelStoreInfo *, gint);
static void store_info_set_string (CamelStoreSummary *, CamelStoreInfo *, int, const gchar *);

G_DEFINE_TYPE (CamelImapStoreSummary, camel_imap_store_summary, CAMEL_TYPE_STORE_SUMMARY)

static void
camel_imap_store_summary_class_init (CamelImapStoreSummaryClass *class)
{
	CamelStoreSummaryClass *store_summary_class;

	store_summary_class = CAMEL_STORE_SUMMARY_CLASS (class);
	store_summary_class->summary_header_load = summary_header_load;
	store_summary_class->summary_header_save = summary_header_save;
	store_summary_class->store_info_load = store_info_load;
	store_summary_class->store_info_save = store_info_save;
	store_summary_class->store_info_free = store_info_free;
	store_summary_class->store_info_string = store_info_string;
	store_summary_class->store_info_set_string = store_info_set_string;
}

static void
camel_imap_store_summary_init (CamelImapStoreSummary *imap_store_summary)
{
	CamelStoreSummary *store_summary;

	store_summary = CAMEL_STORE_SUMMARY (imap_store_summary);
	store_summary->store_info_size = sizeof (CamelImapStoreInfo);

	imap_store_summary->version = CAMEL_IMAP_STORE_SUMMARY_VERSION;
}

/**
 * camel_imap_store_summary_new:
 *
 * Create a new CamelImapStoreSummary object.
 *
 * Returns: A new CamelImapStoreSummary widget.
 **/
CamelImapStoreSummary *
camel_imap_store_summary_new (void)
{
	return g_object_new (CAMEL_TYPE_IMAP_STORE_SUMMARY, NULL);
}

/**
 * camel_imap_store_summary_full_name:
 * @s:
 * @full_name:
 *
 * Retrieve a summary item by full name.
 *
 * A referenced to the summary item is returned, which may be
 * ref'd or free'd as appropriate.
 *
 * Returns: The summary item, or NULL if the @full_name name
 * is not available.
 * It must be freed using camel_store_summary_info_free().
 **/
CamelImapStoreInfo *
camel_imap_store_summary_full_name (CamelImapStoreSummary *s,
                                    const gchar *full_name)
{
	gint count, i;
	CamelImapStoreInfo *info;

	count = camel_store_summary_count ((CamelStoreSummary *) s);
	for (i = 0; i < count; i++) {
		info = (CamelImapStoreInfo *) camel_store_summary_index ((CamelStoreSummary *) s, i);
		if (info) {
			if (strcmp (info->full_name, full_name) == 0)
				return info;
			camel_store_summary_info_free ((CamelStoreSummary *) s, (CamelStoreInfo *) info);
		}
	}

	return NULL;
}

gchar *
camel_imap_store_summary_full_to_path (CamelImapStoreSummary *s,
                                       const gchar *full_name,
                                       gchar dir_sep)
{
	gchar *path, *p;
	gint c;
	const gchar *f;

	if (dir_sep != '/') {
		p = path = alloca (strlen (full_name) * 3 + 1);
		f = full_name;
		while ((c = *f++ & 0xff)) {
			if (c == dir_sep)
				*p++ = '/';
			else if (c == '/' || c == '%')
				p += sprintf(p, "%%%02X", c);
			else
				*p++ = c;
		}
		*p = 0;
	} else
		path = (gchar *) full_name;

	return g_strdup (path);
}

static guint32 hexnib (guint32 c)
{
	if (c >= '0' && c <= '9')
		return c - '0';
	else if (c >= 'A' && c <= 'Z')
		return c - 'A' + 10;
	else
		return 0;
}

gchar *
camel_imap_store_summary_path_to_full (CamelImapStoreSummary *s,
                                       const gchar *path,
                                       gchar dir_sep)
{
	gchar *full, *f;
	guint32 c, v = 0;
	const gchar *p;
	gint state = 0;
	gchar *subpath, *last = NULL;
	CamelStoreInfo *si;
	CamelImapStoreNamespace *ns;

	/* check to see if we have a subpath of path already defined */
	subpath = alloca (strlen (path) + 1);
	strcpy (subpath, path);
	do {
		si = camel_store_summary_path ((CamelStoreSummary *) s, subpath);
		if (si == NULL) {
			last = strrchr (subpath, '/');
			if (last)
				*last = 0;
		}
	} while (si == NULL && last);

	/* path is already present, use the raw version we have */
	if (si && strlen (subpath) == strlen (path)) {
		f = g_strdup (camel_imap_store_info_full_name (s, si));
		camel_store_summary_info_free ((CamelStoreSummary *) s, si);
		return f;
	}

	ns = camel_imap_store_summary_namespace_find_path (s, path);

	f = full = alloca (strlen (path) * 2 + 1);
	if (si)
		p = path + strlen (subpath);
	else if (ns)
		p = path + strlen (ns->path);
	else
		p = path;

	while ((c = camel_utf8_getc ((const guchar **) &p))) {
		switch (state) {
		case 0:
			if (c == '%')
				state = 1;
			else {
				if (c == '/')
					c = dir_sep;
				camel_utf8_putc ((guchar **) &f, c);
			}
			break;
		case 1:
			state = 2;
			v = hexnib (c) << 4;
			break;
		case 2:
			state = 0;
			v |= hexnib (c);
			camel_utf8_putc ((guchar **) &f, v);
			break;
		}
	}
	camel_utf8_putc ((guchar **) &f, c);

	/* merge old path part if required */
	f = g_strdup (full);
	if (si) {
		full = g_strdup_printf("%s%s", camel_imap_store_info_full_name(s, si), f);
		g_free (f);
		camel_store_summary_info_free ((CamelStoreSummary *) s, si);
		f = full;
	} else if (ns) {
		full = g_strdup_printf("%s%s", ns->full_name, f);
		g_free (f);
		f = full;
	}

	return f;
}

CamelImapStoreInfo *
camel_imap_store_summary_add_from_full (CamelImapStoreSummary *s,
                                        const gchar *full,
                                        gchar dir_sep)
{
	CamelImapStoreInfo *info;
	gchar *pathu8, *prefix;
	gint len;
	gchar *full_name;
	CamelImapStoreNamespace *ns;

	d(printf("adding full name '%s' '%c'\n", full, dir_sep));

	len = strlen (full);
	full_name = alloca (len + 1);
	strcpy (full_name, full);
	if (full_name[len - 1] == dir_sep)
		full_name[len - 1] = 0;

	info = camel_imap_store_summary_full_name (s, full_name);
	if (info) {
		camel_store_summary_info_free ((CamelStoreSummary *) s, (CamelStoreInfo *) info);
		d(printf("  already there\n"));
		return info;
	}

	ns = camel_imap_store_summary_namespace_find_full (s, full_name);
	if (ns) {
		d(printf("(found namespace for '%s' ns '%s') ", full_name, ns->path));
		len = strlen (ns->full_name);
		if (len >= strlen (full_name)) {
			pathu8 = g_strdup (ns->path);
		} else {
			if (full_name[len] == ns->sep)
				len++;

			prefix = camel_imap_store_summary_full_to_path (s, full_name + len, ns->sep);
			if (*ns->path) {
				pathu8 = g_strdup_printf ("%s/%s", ns->path, prefix);
				g_free (prefix);
			} else {
				pathu8 = prefix;
			}
		}
		d(printf(" (pathu8 = '%s')", pathu8));
	} else {
		d(printf("(Cannot find namespace for '%s')\n", full_name));
		pathu8 = camel_imap_store_summary_full_to_path (s, full_name, dir_sep);
	}

	info = (CamelImapStoreInfo *) camel_store_summary_add_from_path ((CamelStoreSummary *) s, pathu8);
	if (info) {
		d(printf("  '%s' -> '%s'\n", pathu8, full_name));
		camel_store_info_set_string ((CamelStoreSummary *) s, (CamelStoreInfo *) info, CAMEL_IMAP_STORE_INFO_FULL_NAME, full_name);

		if (!g_ascii_strcasecmp(full_name, "inbox"))
			info->info.flags |= CAMEL_FOLDER_SYSTEM | CAMEL_FOLDER_TYPE_INBOX;
	} else {
		d(printf("  failed\n"));
	}

	return info;
}

/* should this be const? */
/* TODO: deprecate/merge this function with path_to_full */
gchar *
camel_imap_store_summary_full_from_path (CamelImapStoreSummary *s,
                                         const gchar *path)
{
	CamelImapStoreNamespace *ns;
	gchar *name = NULL;

	ns = camel_imap_store_summary_namespace_find_path (s, path);
	if (ns)
		name = camel_imap_store_summary_path_to_full (s, path, ns->sep);

	d(printf("looking up path %s -> %s\n", path, name?name:"not found"));

	return name;
}

static CamelImapStoreNamespace *
namespace_new (CamelImapStoreSummary *s,
               const gchar *full_name,
               gchar dir_sep)
{
	CamelImapStoreNamespace *ns;
	gchar *p, *o, c;
	gint len;

	ns = g_malloc0 (sizeof (*ns));
	ns->full_name = g_strdup (full_name);
	len = strlen (ns->full_name) - 1;
	if (len >= 0 && ns->full_name[len] == dir_sep)
		ns->full_name[len] = 0;
	ns->sep = dir_sep;

	o = p = ns->path = camel_imap_store_summary_full_to_path (s, ns->full_name, dir_sep);
	while ((c = *p++)) {
		if (c != '#') {
			if (c == '/')
				c = '.';
			*o++ = c;
		}
	}
	*o = 0;

	return ns;
}

static CamelImapStoreNamespace *
namespace_find (CamelImapStoreNamespace *ns,
                const gchar *full_name,
                gchar dir_sep)
{
	if (!ns || !full_name)
		return NULL;

	while (ns) {
		gint len = strlen (ns->full_name);

		if ((g_ascii_strcasecmp (ns->full_name, full_name) == 0 ||
		    (g_ascii_strncasecmp (ns->full_name, full_name, len) == 0
		    && len + 1 == strlen (full_name) && full_name[len] == ns->sep)) && (!dir_sep || ns->sep == dir_sep)) {
			break;
		}
		ns = ns->next;
	}

	return ns;
}

void
camel_imap_store_summary_namespace_set_main (CamelImapStoreSummary *s,
                                             const gchar *full_name,
                                             gchar dir_sep)
{
	CamelImapStoreNamespace *ns;

	g_return_if_fail (s != NULL);

	if (full_name == NULL)
		full_name = "";

	ns = namespace_find (s->namespace, full_name, dir_sep);

	if (ns) {
		/* is in the list of known namespaces already */
		if (ns != s->namespace) {
			CamelImapStoreNamespace *prev = s->namespace;

			while (prev && prev->next != ns)
				prev = prev->next;

			g_return_if_fail (prev != NULL);

			/* move it to the first */
			prev->next = ns->next;
			ns->next = s->namespace;
			s->namespace = ns;

			/* fix a dir separator, for the inherit/guess option */
			if (dir_sep != 0)
				s->namespace->sep = dir_sep;
		} else
			return;
	} else {
		if (!dir_sep && s->namespace)
			dir_sep = s->namespace->sep; /* inherit */
		else if (!dir_sep)
			dir_sep = '/'; /* guess */

		ns = namespace_new (s, full_name, dir_sep);
		if (ns) {
			ns->next = s->namespace;
			s->namespace = ns;
		}
	}

	camel_store_summary_touch ((CamelStoreSummary *) s);
}

void
camel_imap_store_summary_namespace_add_secondary (CamelImapStoreSummary *s,
                                                  const gchar *full_name,
                                                  gchar dir_sep)
{
	CamelImapStoreNamespace **tail;

	g_return_if_fail (s != NULL);
	g_return_if_fail (full_name != NULL);

	if (namespace_find (s->namespace, full_name, dir_sep))
		return;

	for (tail = &s->namespace; *tail; tail = &((*tail)->next)) {
		/* do nothing, just keep moving to the last */
	}

	*tail = namespace_new (s, full_name, dir_sep);
}

CamelImapStoreNamespace *
camel_imap_store_summary_get_main_namespace (CamelImapStoreSummary *s)
{
	g_return_val_if_fail (s != NULL, NULL);

	return s->namespace;
}

CamelImapStoreNamespace *
camel_imap_store_summary_namespace_find_path (CamelImapStoreSummary *s,
                                              const gchar *path)
{
	gint len;
	CamelImapStoreNamespace *ns;

	ns = s->namespace;
	while (ns) {
		len = strlen (ns->path);
		if (len == 0
		    || (strncmp (ns->path, path, len) == 0
			&& (path[len] == '/' || path[len] == 0)))
			break;
		ns = ns->next;
	}

	/* NULL indicates not found */
	return ns;
}

CamelImapStoreNamespace *
camel_imap_store_summary_namespace_find_full (CamelImapStoreSummary *s,
                                              const gchar *full)
{
	gint len;
	CamelImapStoreNamespace *ns;

	ns = s->namespace;
	while (ns) {
		len = strlen (ns->full_name);
		d(printf("find_full: comparing namespace '%s' to name '%s'\n", ns->full_name, full));
		if (len == 0
		    || (strncmp (ns->full_name, full, len) == 0
			&& (full[len] == ns->sep || full[len] == 0)))
			break;
		ns = ns->next;
	}

	/* NULL indicates not found */
	return ns;
}

static void
namespace_free (CamelImapStoreSummary *is,
                CamelImapStoreNamespace *ns)
{
	g_free (ns->path);
	g_free (ns->full_name);
	g_free (ns);
}

static void
namespace_clear (CamelImapStoreSummary *is)
{
	while (is->namespace) {
		CamelImapStoreNamespace *next = is->namespace->next;

		namespace_free (is, is->namespace);
		is->namespace = next;
	}
}

static gboolean
namespaces_load (CamelImapStoreSummary *s,
                 FILE *in,
                 guint count)
{
	CamelImapStoreNamespace *ns, **tail;
	guint32 sep = '/';

	namespace_clear (s);

	tail = &s->namespace;

	while (count > 0) {
		ns = g_malloc0 (sizeof (*ns));
		if (camel_file_util_decode_string (in, &ns->path) == -1
		    || camel_file_util_decode_string (in, &ns->full_name) == -1
		    || camel_file_util_decode_uint32 (in, &sep) == -1) {
			namespace_free (s, ns);
			return FALSE;
		} else {
			ns->sep = sep;

			*tail = ns;
			tail = &ns->next;
		}

		count--;
	}

	return count == 0;
}

static gboolean
namespaces_save (CamelImapStoreSummary *s,
                 FILE *in,
                 CamelImapStoreNamespace *ns)
{
	while (ns) {
		if (camel_file_util_encode_string (in, ns->path) == -1
		    || camel_file_util_encode_string (in, ns->full_name) == -1
		    || camel_file_util_encode_uint32 (in, (guint32) ns->sep) == -1)
			return FALSE;

		ns = ns->next;
	}

	return TRUE;
}

static gint
summary_header_load (CamelStoreSummary *s,
                     FILE *in)
{
	CamelImapStoreSummary *is = (CamelImapStoreSummary *) s;
	gint32 version, capabilities, count;

	namespace_clear (is);

	if (CAMEL_STORE_SUMMARY_CLASS (camel_imap_store_summary_parent_class)->summary_header_load ((CamelStoreSummary *) s, in) == -1
	    || camel_file_util_decode_fixed_int32 (in, &version) == -1)
		return -1;

	is->version = version;

	if (version < CAMEL_IMAP_STORE_SUMMARY_VERSION_0) {
		g_warning("Store summary header version too low");
		return -1;
	}

	if (camel_file_util_decode_fixed_int32 (in, &capabilities) == -1
	    || camel_file_util_decode_fixed_int32 (in, &count) == -1)
		return -1;

	is->capabilities = capabilities;
	if (count >= 1) {
		if (!namespaces_load (is, in, count))
			return -1;
	}

	return 0;
}

static gint
summary_header_save (CamelStoreSummary *s,
                     FILE *out)
{
	CamelImapStoreSummary *is = (CamelImapStoreSummary *) s;
	guint32 count = 0;
	CamelImapStoreNamespace *ns;

	for (ns = is->namespace; ns; ns = ns->next) {
		count++;
	}

	/* always write as latest version */
	if (CAMEL_STORE_SUMMARY_CLASS (camel_imap_store_summary_parent_class)->summary_header_save ((CamelStoreSummary *) s, out) == -1
	    || camel_file_util_encode_fixed_int32 (out, CAMEL_IMAP_STORE_SUMMARY_VERSION) == -1
	    || camel_file_util_encode_fixed_int32 (out, is->capabilities) == -1
	    || camel_file_util_encode_fixed_int32 (out, count) == -1)
		return -1;

	if (!namespaces_save (is, out, is->namespace))
		return -1;

	return 0;
}

static CamelStoreInfo *
store_info_load (CamelStoreSummary *s,
                 FILE *in)
{
	CamelImapStoreInfo *mi;

	mi = (CamelImapStoreInfo *) CAMEL_STORE_SUMMARY_CLASS (camel_imap_store_summary_parent_class)->store_info_load (s, in);
	if (mi) {
		if (camel_file_util_decode_string (in, &mi->full_name) == -1) {
			camel_store_summary_info_free (s, (CamelStoreInfo *) mi);
			mi = NULL;
		} else {
			/* NB: this is done again for compatability */
			if (g_ascii_strcasecmp(mi->full_name, "inbox") == 0)
				mi->info.flags |= CAMEL_FOLDER_SYSTEM | CAMEL_FOLDER_TYPE_INBOX;
		}
	}

	return (CamelStoreInfo *) mi;
}

static gint
store_info_save (CamelStoreSummary *s,
                 FILE *out,
                 CamelStoreInfo *mi)
{
	CamelImapStoreInfo *isi = (CamelImapStoreInfo *) mi;

	if (CAMEL_STORE_SUMMARY_CLASS (camel_imap_store_summary_parent_class)->store_info_save (s, out, mi) == -1
	    || camel_file_util_encode_string (out, isi->full_name) == -1)
		return -1;

	return 0;
}

static void
store_info_free (CamelStoreSummary *s,
                 CamelStoreInfo *mi)
{
	CamelImapStoreInfo *isi = (CamelImapStoreInfo *) mi;

	g_free (isi->full_name);
	CAMEL_STORE_SUMMARY_CLASS (camel_imap_store_summary_parent_class)->store_info_free (s, mi);
}

static const gchar *
store_info_string (CamelStoreSummary *s,
                   const CamelStoreInfo *mi,
                   gint type)
{
	CamelImapStoreInfo *isi = (CamelImapStoreInfo *) mi;

	/* FIXME: Locks? */

	g_assert (mi != NULL);

	switch (type) {
	case CAMEL_IMAP_STORE_INFO_FULL_NAME:
		return isi->full_name;
	default:
		return CAMEL_STORE_SUMMARY_CLASS (camel_imap_store_summary_parent_class)->store_info_string (s, mi, type);
	}
}

static void
store_info_set_string (CamelStoreSummary *s,
                       CamelStoreInfo *mi,
                       gint type,
                       const gchar *str)
{
	CamelImapStoreInfo *isi = (CamelImapStoreInfo *) mi;

	g_assert (mi != NULL);

	switch (type) {
	case CAMEL_IMAP_STORE_INFO_FULL_NAME:
		d(printf("Set full name %s -> %s\n", isi->full_name, str));
		camel_store_summary_lock (s, CAMEL_STORE_SUMMARY_SUMMARY_LOCK);
		g_free (isi->full_name);
		isi->full_name = g_strdup (str);
		camel_store_summary_unlock (s, CAMEL_STORE_SUMMARY_SUMMARY_LOCK);
		break;
	default:
		CAMEL_STORE_SUMMARY_CLASS (camel_imap_store_summary_parent_class)->store_info_set_string (s, mi, type, str);
		break;
	}
}
