/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/*
 * Copyright (C) 2013 Intel Corporation
 *
 * This library is free software: you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation.
 *
 * This library 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 Lesser General Public License
 * for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this library. If not, see <http://www.gnu.org/licenses/>.
 *
 * Authors: Tristan Van Berkom <tristanvb@openismus.com>
 */

/**
 * SECTION: e-data-book-cursor-sqlite
 * @include: libedata-book/libedata-book.h
 * @short_description: The SQLite cursor implementation
 *
 * This cursor implementation can be used with any backend which
 * stores contacts using #EBookSqlite.
 */

#include "evolution-data-server-config.h"

#include <glib/gi18n.h>

#include "e-data-book-cursor-sqlite.h"

#define E_DATA_BOOK_CURSOR_SQLITE_GET_PRIVATE(obj) \
	(G_TYPE_INSTANCE_GET_PRIVATE \
	((obj), E_TYPE_DATA_BOOK_CURSOR_SQLITE, EDataBookCursorSqlitePrivate))

/* GObjectClass */
static void e_data_book_cursor_sqlite_dispose      (GObject *object);
static void e_data_book_cursor_sqlite_finalize     (GObject *object);
static void e_data_book_cursor_sqlite_set_property (GObject *object,
						    guint property_id,
						    const GValue *value,
						    GParamSpec *pspec);

/* EDataBookCursorClass */
static gboolean e_data_book_cursor_sqlite_set_sexp             (EDataBookCursor     *cursor,
								const gchar         *sexp,
								GError             **error);
static gint     e_data_book_cursor_sqlite_step                 (EDataBookCursor     *cursor,
								const gchar         *revision_guard,
								EBookCursorStepFlags flags,
								EBookCursorOrigin    origin,
								gint                 count,
								GSList             **results,
								GCancellable        *cancellable,
								GError             **error);
static gboolean e_data_book_cursor_sqlite_set_alphabetic_index (EDataBookCursor     *cursor,
								gint                 index,
								const gchar         *locale,
								GError             **error);
static gboolean e_data_book_cursor_sqlite_get_position         (EDataBookCursor     *cursor,
								gint                *total,
								gint                *position,
								GCancellable        *cancellable,
								GError             **error);
static gint     e_data_book_cursor_sqlite_compare_contact      (EDataBookCursor     *cursor,
								EContact            *contact,
								gboolean            *matches_sexp);
static gboolean e_data_book_cursor_sqlite_load_locale          (EDataBookCursor     *cursor,
								gchar              **locale,
								GError             **error);

struct _EDataBookCursorSqlitePrivate {
	EBookSqlite *ebsql;
	EbSqlCursor *cursor;
	gchar       *revision_key;
};

enum {
	PROP_0,
	PROP_EBSQL,
	PROP_REVISION_KEY,
	PROP_CURSOR,
};

G_DEFINE_TYPE (EDataBookCursorSqlite, e_data_book_cursor_sqlite, E_TYPE_DATA_BOOK_CURSOR);

/************************************************
 *                  GObjectClass                *
 ************************************************/
static void
e_data_book_cursor_sqlite_class_init (EDataBookCursorSqliteClass *class)
{
	GObjectClass *object_class;
	EDataBookCursorClass *cursor_class;

	object_class = G_OBJECT_CLASS (class);
	object_class->dispose = e_data_book_cursor_sqlite_dispose;
	object_class->finalize = e_data_book_cursor_sqlite_finalize;
	object_class->set_property = e_data_book_cursor_sqlite_set_property;

	cursor_class = E_DATA_BOOK_CURSOR_CLASS (class);
	cursor_class->set_sexp = e_data_book_cursor_sqlite_set_sexp;
	cursor_class->step = e_data_book_cursor_sqlite_step;
	cursor_class->set_alphabetic_index = e_data_book_cursor_sqlite_set_alphabetic_index;
	cursor_class->get_position = e_data_book_cursor_sqlite_get_position;
	cursor_class->compare_contact = e_data_book_cursor_sqlite_compare_contact;
	cursor_class->load_locale = e_data_book_cursor_sqlite_load_locale;

	g_object_class_install_property (
		object_class,
		PROP_EBSQL,
		g_param_spec_object (
			"ebsql", "EBookSqlite",
			"The EBookSqlite to use for queries",
			E_TYPE_BOOK_SQLITE,
			G_PARAM_WRITABLE | G_PARAM_CONSTRUCT_ONLY));

	g_object_class_install_property (
		object_class,
		PROP_REVISION_KEY,
		g_param_spec_string (
			"revision-key", "Revision Key",
			"The key name to fetch the revision from the sqlite backend",
			NULL,
			G_PARAM_WRITABLE | G_PARAM_CONSTRUCT_ONLY));

	g_object_class_install_property (
		object_class,
		PROP_CURSOR,
		g_param_spec_pointer (
			"cursor", "Cursor",
			"The EbSqlCursor pointer",
			G_PARAM_WRITABLE | G_PARAM_CONSTRUCT_ONLY));

	g_type_class_add_private (class, sizeof (EDataBookCursorSqlitePrivate));
}

static void
e_data_book_cursor_sqlite_init (EDataBookCursorSqlite *cursor)
{
	cursor->priv = E_DATA_BOOK_CURSOR_SQLITE_GET_PRIVATE (cursor);
}

static void
e_data_book_cursor_sqlite_dispose (GObject *object)
{
	EDataBookCursorSqlite        *cursor = E_DATA_BOOK_CURSOR_SQLITE (object);
	EDataBookCursorSqlitePrivate *priv = cursor->priv;

	if (priv->ebsql != NULL) {

		if (priv->cursor != NULL)
			e_book_sqlite_cursor_free (
				priv->ebsql, priv->cursor);

		g_object_unref (priv->ebsql);
		priv->ebsql = NULL;
		priv->cursor = NULL;
	}

	G_OBJECT_CLASS (e_data_book_cursor_sqlite_parent_class)->dispose (object);
}

static void
e_data_book_cursor_sqlite_finalize (GObject *object)
{
	EDataBookCursorSqlite        *cursor = E_DATA_BOOK_CURSOR_SQLITE (object);
	EDataBookCursorSqlitePrivate *priv = cursor->priv;

	g_free (priv->revision_key);

	G_OBJECT_CLASS (e_data_book_cursor_sqlite_parent_class)->finalize (object);
}

static void
e_data_book_cursor_sqlite_set_property (GObject *object,
                                        guint property_id,
                                        const GValue *value,
                                        GParamSpec *pspec)
{
	EDataBookCursorSqlite        *cursor = E_DATA_BOOK_CURSOR_SQLITE (object);
	EDataBookCursorSqlitePrivate *priv = cursor->priv;

	switch (property_id) {
	case PROP_EBSQL:
		/* Construct-only, can only be set once */
		priv->ebsql = g_value_dup_object (value);
		break;
	case PROP_REVISION_KEY:
		/* Construct-only, can only be set once */
		priv->revision_key = g_value_dup_string (value);
		break;
	case PROP_CURSOR:
		/* Construct-only, can only be set once */
		priv->cursor = g_value_get_pointer (value);
		break;
	default:
		G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
		break;
	}
}

/************************************************
 *            EDataBookCursorClass              *
 ************************************************/
static gboolean
e_data_book_cursor_sqlite_set_sexp (EDataBookCursor *cursor,
                                    const gchar *sexp,
                                    GError **error)
{
	EDataBookCursorSqlite *cursor_sqlite;
	EDataBookCursorSqlitePrivate *priv;
	GError *local_error = NULL;
	gboolean success;

	cursor_sqlite = E_DATA_BOOK_CURSOR_SQLITE (cursor);
	priv = cursor_sqlite->priv;

	success = e_book_sqlite_cursor_set_sexp (
		priv->ebsql, priv->cursor, sexp, &local_error);

	if (!success) {
		if (g_error_matches (local_error,
				     E_BOOK_SQLITE_ERROR,
				     E_BOOK_SQLITE_ERROR_INVALID_QUERY)) {
			g_set_error_literal (
				error,
				E_CLIENT_ERROR,
				E_CLIENT_ERROR_INVALID_QUERY,
				local_error->message);
			g_clear_error (&local_error);
		} else {
			g_propagate_error (error, local_error);
		}
	}

	return success;
}

static gboolean
convert_origin (EBookCursorOrigin src_origin,
                EbSqlCursorOrigin *dest_origin,
                GError **error)
{
	gboolean success = TRUE;

	switch (src_origin) {
	case E_BOOK_CURSOR_ORIGIN_CURRENT:
		*dest_origin = EBSQL_CURSOR_ORIGIN_CURRENT;
		break;
	case E_BOOK_CURSOR_ORIGIN_BEGIN:
		*dest_origin = EBSQL_CURSOR_ORIGIN_BEGIN;
		break;
	case E_BOOK_CURSOR_ORIGIN_END:
		*dest_origin = EBSQL_CURSOR_ORIGIN_END;
		break;
	default:
		success = FALSE;
		g_set_error_literal (
			error,
			E_CLIENT_ERROR,
			E_CLIENT_ERROR_INVALID_ARG,
			_("Unrecognized cursor origin"));
		break;
	}

	return success;
}

static void
convert_flags (EBookCursorStepFlags src_flags,
               EbSqlCursorStepFlags *dest_flags)
{
	if (src_flags & E_BOOK_CURSOR_STEP_MOVE)
		*dest_flags |= EBSQL_CURSOR_STEP_MOVE;

	if (src_flags & E_BOOK_CURSOR_STEP_FETCH)
		*dest_flags |= EBSQL_CURSOR_STEP_FETCH;
}

static gint
e_data_book_cursor_sqlite_step (EDataBookCursor *cursor,
                                const gchar *revision_guard,
                                EBookCursorStepFlags flags,
                                EBookCursorOrigin origin,
                                gint count,
                                GSList **results,
                                GCancellable *cancellable,
                                GError **error)
{
	EDataBookCursorSqlite *cursor_sqlite;
	EDataBookCursorSqlitePrivate *priv;
	GSList *local_results = NULL, *local_converted_results = NULL, *l;
	EbSqlCursorOrigin sqlite_origin = EBSQL_CURSOR_ORIGIN_CURRENT;
	EbSqlCursorStepFlags sqlite_flags = 0;
	gchar *revision = NULL;
	gboolean success = FALSE;
	gint n_results = -1;

	cursor_sqlite = E_DATA_BOOK_CURSOR_SQLITE (cursor);
	priv = cursor_sqlite->priv;

	if (!convert_origin (origin, &sqlite_origin, error))
		return FALSE;

	convert_flags (flags, &sqlite_flags);

	/* Here we check the EBookSqlite revision
	 * against the revision_guard with an atomic transaction
	 * with the sqlite.
	 *
	 * The addressbook modifications and revision changes
	 * are also atomically committed to the SQLite.
	 */
	success = e_book_sqlite_lock (priv->ebsql, EBSQL_LOCK_READ, cancellable, error);

	if (success && revision_guard)
		success = e_book_sqlite_get_key_value (
			priv->ebsql,
			priv->revision_key,
			&revision,
			error);

	if (success && revision_guard &&
	    g_strcmp0 (revision, revision_guard) != 0) {

		g_set_error_literal (
			error,
			E_CLIENT_ERROR,
			E_CLIENT_ERROR_OUT_OF_SYNC,
			_("Out of sync revision while moving cursor"));
		success = FALSE;
	}

	if (success) {
		GError *local_error = NULL;

		n_results = e_book_sqlite_cursor_step (
			priv->ebsql,
			priv->cursor,
			sqlite_flags,
			sqlite_origin,
			count,
			&local_results,
			cancellable,
			&local_error);

		if (n_results < 0) {

			/* Convert the SQLite backend error to an EClient error */
			if (g_error_matches (local_error,
					     E_BOOK_SQLITE_ERROR,
					     E_BOOK_SQLITE_ERROR_END_OF_LIST)) {
				g_set_error_literal (
					error, E_CLIENT_ERROR,
					E_CLIENT_ERROR_QUERY_REFUSED,
					local_error->message);
				g_clear_error (&local_error);
			} else
				g_propagate_error (error, local_error);

			success = FALSE;
		}
	}

	if (success) {
		success = e_book_sqlite_unlock (priv->ebsql, EBSQL_UNLOCK_NONE, error);

	} else {
		GError *local_error = NULL;

		if (!e_book_sqlite_unlock (priv->ebsql, EBSQL_UNLOCK_NONE, &local_error)) {
			g_warning (
				"Error occurred while unlocking the SQLite: %s",
				local_error->message);
			g_clear_error (&local_error);
		}
	}

	for (l = local_results; l; l = l->next) {
		EbSqlSearchData *data = l->data;

		local_converted_results =
			g_slist_prepend (local_converted_results, data->vcard);
		data->vcard = NULL;
	}

	g_slist_free_full (local_results, (GDestroyNotify) e_book_sqlite_search_data_free);

	if (results)
		*results = g_slist_reverse (local_converted_results);
	else
		g_slist_free_full (local_converted_results, (GDestroyNotify) g_free);

	g_free (revision);

	if (success)
		return n_results;

	return -1;
}

static gboolean
e_data_book_cursor_sqlite_set_alphabetic_index (EDataBookCursor *cursor,
                                                gint index,
                                                const gchar *locale,
                                                GError **error)
{
	EDataBookCursorSqlite *cursor_sqlite;
	EDataBookCursorSqlitePrivate *priv;
	gchar *current_locale = NULL;

	cursor_sqlite = E_DATA_BOOK_CURSOR_SQLITE (cursor);
	priv = cursor_sqlite->priv;

	if (!e_book_sqlite_get_locale (priv->ebsql, &current_locale, error))
		return FALSE;

	/* Locale mismatch, need to report error */
	if (g_strcmp0 (current_locale, locale) != 0) {
		g_set_error_literal (
			error,
			E_CLIENT_ERROR,
			E_CLIENT_ERROR_OUT_OF_SYNC,
			_("Alphabetic index was set for incorrect locale"));
		g_free (current_locale);
		return FALSE;
	}

	e_book_sqlite_cursor_set_target_alphabetic_index (
		priv->ebsql,
		priv->cursor,
		index);
	g_free (current_locale);
	return TRUE;
}

static gboolean
e_data_book_cursor_sqlite_get_position (EDataBookCursor *cursor,
                                        gint *total,
                                        gint *position,
                                        GCancellable *cancellable,
                                        GError **error)
{
	EDataBookCursorSqlite *cursor_sqlite;
	EDataBookCursorSqlitePrivate *priv;

	cursor_sqlite = E_DATA_BOOK_CURSOR_SQLITE (cursor);
	priv = cursor_sqlite->priv;

	return e_book_sqlite_cursor_calculate (
		priv->ebsql,
		priv->cursor,
		total, position,
		cancellable,
		error);
}

static gint
e_data_book_cursor_sqlite_compare_contact (EDataBookCursor *cursor,
                                           EContact *contact,
                                           gboolean *matches_sexp)
{
	EDataBookCursorSqlite *cursor_sqlite;
	EDataBookCursorSqlitePrivate *priv;

	cursor_sqlite = E_DATA_BOOK_CURSOR_SQLITE (cursor);
	priv = cursor_sqlite->priv;

	return e_book_sqlite_cursor_compare_contact (
		priv->ebsql,
		priv->cursor,
		contact,
		matches_sexp);
}

static gboolean
e_data_book_cursor_sqlite_load_locale (EDataBookCursor *cursor,
                                       gchar **locale,
                                       GError **error)
{
	EDataBookCursorSqlite        *cursor_sqlite;
	EDataBookCursorSqlitePrivate *priv;

	cursor_sqlite = E_DATA_BOOK_CURSOR_SQLITE (cursor);
	priv = cursor_sqlite->priv;

	return e_book_sqlite_get_locale (priv->ebsql, locale, error);
}

/************************************************
 *                       API                    *
 ************************************************/
/**
 * e_data_book_cursor_sqlite_new:
 * @backend: the #EBookBackend creating this cursor
 * @ebsql: the #EBookSqlite object to base this cursor on
 * @revision_key: The key name to consult for the current overall contacts database revision
 * @sort_fields: (array length=n_fields): an array of #EContactFields as sort keys in order of priority
 * @sort_types: (array length=n_fields): an array of #EBookCursorSortTypes, one for each field in @sort_fields
 * @n_fields: the number of fields to sort results by.
 * @error: a return location to story any error that might be reported.
 *
 * Creates an #EDataBookCursor and implements all of the cursor methods
 * using the delegate @ebsql object.
 *
 * This is a suitable cursor type for any backend which stores its contacts
 * using the #EBookSqlite object.
 *
 * Returns: (transfer full): A newly created #EDataBookCursor, or %NULL if cursor creation failed.
 *
 * Since: 3.12
 */
EDataBookCursor *
e_data_book_cursor_sqlite_new (EBookBackend *backend,
                               EBookSqlite *ebsql,
                               const gchar *revision_key,
                               const EContactField *sort_fields,
                               const EBookCursorSortType *sort_types,
                               guint n_fields,
                               GError **error)
{
	EDataBookCursor *cursor = NULL;
	EbSqlCursor     *ebsql_cursor;
	GError          *local_error = NULL;

	g_return_val_if_fail (E_IS_BOOK_BACKEND (backend), NULL);
	g_return_val_if_fail (E_IS_BOOK_SQLITE (ebsql), NULL);

	ebsql_cursor = e_book_sqlite_cursor_new (
		ebsql, NULL,
		sort_fields,
		sort_types,
		n_fields,
		&local_error);

	if (ebsql_cursor) {
		cursor = g_object_new (
			E_TYPE_DATA_BOOK_CURSOR_SQLITE,
			"backend", backend,
			"ebsql", ebsql,
			"revision-key", revision_key,
			"cursor", ebsql_cursor,
			NULL);

		/* Initially created cursors should have a position & total */
		if (!e_data_book_cursor_load_locale (E_DATA_BOOK_CURSOR (cursor),
						     NULL, NULL, error))
			g_clear_object (&cursor);

	} else if (g_error_matches (local_error,
				    E_BOOK_SQLITE_ERROR,
				    E_BOOK_SQLITE_ERROR_INVALID_QUERY)) {
		g_set_error_literal (
			error,
			E_CLIENT_ERROR,
			E_CLIENT_ERROR_INVALID_QUERY,
			local_error->message);
		g_clear_error (&local_error);
	} else {
		g_propagate_error (error, local_error);
	}

	return cursor;
}