/*-*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/* e-book-sqlitedb.h
 *
 * 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>
 */

#if !defined (__LIBEDATA_BOOK_H_INSIDE__) && !defined (LIBEDATA_BOOK_COMPILATION)
#error "Only <libedata-book/libedata-book.h> should be included directly."
#endif

#ifndef E_BOOK_SQLITE_H
#define E_BOOK_SQLITE_H

#include <libebook-contacts/libebook-contacts.h>

/* Standard GObject macros */
#define E_TYPE_BOOK_SQLITE \
	(e_book_sqlite_get_type ())
#define E_BOOK_SQLITE(obj) \
	(G_TYPE_CHECK_INSTANCE_CAST \
	((obj), E_TYPE_BOOK_SQLITE, EBookSqlite))
#define E_BOOK_SQLITE_CLASS(cls) \
	(G_TYPE_CHECK_CLASS_CAST \
	((cls), E_TYPE_BOOK_SQLITE, EBookSqliteClass))
#define E_IS_BOOK_SQLITE(obj) \
	(G_TYPE_CHECK_INSTANCE_TYPE \
	((obj), E_TYPE_BOOK_SQLITE))
#define E_IS_BOOK_SQLITE_CLASS(cls) \
	(G_TYPE_CHECK_CLASS_TYPE \
	((cls), E_TYPE_BOOK_SQLITE))
#define E_BOOK_SQLITE_GET_CLASS(obj) \
	(G_TYPE_INSTANCE_GET_CLASS \
	((obj), E_TYPE_BOOK_SQLITE, EBookSqliteClass))

/**
 * E_BOOK_SQLITE_ERROR:
 *
 * Error domain for #EBookSqlite operations.
 *
 * Since: 3.12
 **/
#define E_BOOK_SQLITE_ERROR (e_book_sqlite_error_quark ())

/**
 * E_BOOK_SQL_IS_POPULATED_KEY:
 *
 * This key can be used with e_book_sqlite_get_key_value().
 *
 * In the case of a migration from an older SQLite, any value which
 * was previously stored with e_book_backend_sqlitedb_set_is_populated()
 * can be retrieved with this key.
 *
 * Since: 3.12
 **/
#define E_BOOK_SQL_IS_POPULATED_KEY "eds-reserved-namespace-is-populated"

/**
 * E_BOOK_SQL_SYNC_DATA_KEY:
 *
 * This key can be used with e_book_sqlite_get_key_value().
 *
 * In the case of a migration from an older SQLite, any value which
 * was previously stored with e_book_backend_sqlitedb_set_sync_data()
 * can be retrieved with this key.
 *
 * Since: 3.12
 **/
#define E_BOOK_SQL_SYNC_DATA_KEY "eds-reserved-namespace-sync-data"

G_BEGIN_DECLS

typedef struct _EBookSqlite EBookSqlite;
typedef struct _EBookSqliteClass EBookSqliteClass;
typedef struct _EBookSqlitePrivate EBookSqlitePrivate;

/**
 * EbSqlChangeType:
 * @EBSQL_CHANGE_CONTACT_ADDED: Contact was modified as a result of its addition to the addressbook
 * @EBSQL_CHANGE_LOCALE_CHANGED: Contact was modified as a result of a locale change
 * @EBSQL_CHANGE_LAST: A symbolic end marker for this enumeration, will not be passed in callbacks.
 *
 * Indicates the type of change which occurred in an #EbSqlChangeCallback
 *
 * Since: 3.12
 **/
typedef enum {
	EBSQL_CHANGE_CONTACT_ADDED,
	EBSQL_CHANGE_LOCALE_CHANGED,
	EBSQL_CHANGE_LAST
} EbSqlChangeType;

/**
 * EbSqlChangeCallback:
 * @change_type: The #EbSqlChangeType which occurred
 * @uid: A contact UID
 * @extra: The extra data associated to the contact
 * @vcard: The vcard string for this UID
 * @user_data: Pointer to user provided data
 *
 * A function which may be called in response to a change
 * in contact data.
 *
 * <note><para>This user callback is called inside a lock,
 * you must not call the #EBookSqlite API from
 * this callback.</para></note>
 *
 * Since: 3.12
 **/
typedef void	(*EbSqlChangeCallback)		(EbSqlChangeType change_type,
						 const gchar *uid,
						 const gchar *extra,
						 const gchar *vcard,
						 gpointer user_data);

/**
 * EbSqlVCardCallback:
 * @uid: A contact UID
 * @extra: The extra data associated to the contact
 * @user_data: User data previously passed to e_book_sqlite_new()
 *
 * If this callback is passed to e_book_sqlite_new(), then
 * vcards are not stored in the SQLite and instead this callback
 * is invoked to fetch the vcard.
 *
 * This callback will be called to fetch results for fully indexed
 * and optimized queries, and it will also be called while performing
 * fallback queries against #EContactFields which are not configured
 * in the #ESourceBackendSummarySetup or default summary fields. 
 *
 * <note><para>This user callback is called inside a lock,
 * you must not call the #EBookSqlite API from
 * this callback.</para></note>
 *
 * Returns: (transfer full): The appropriate vcard indicated by @uid
 *
 * Since: 3.12
 **/
typedef gchar *	(*EbSqlVCardCallback)		(const gchar *uid,
						 const gchar *extra,
						 gpointer user_data);

/**
 * EBookSqliteError:
 * @E_BOOK_SQLITE_ERROR_ENGINE: An error was reported from the SQLite engine
 * @E_BOOK_SQLITE_ERROR_CONSTRAINT: The error occurred due to an explicit constraint, this will
 * happen when attempting to add two contacts with the same UID.
 * @E_BOOK_SQLITE_ERROR_CONTACT_NOT_FOUND: A contact was not found by UID (this is
 * different from a query that returns no results, which is not an error).
 * @E_BOOK_SQLITE_ERROR_INVALID_QUERY: A query was invalid. This can happen if the
 * search expression could not be parsed or if a phone number query contained non-phonenumber input.
 * @E_BOOK_SQLITE_ERROR_UNSUPPORTED_QUERY: A query was not supported
 * @E_BOOK_SQLITE_ERROR_UNSUPPORTED_FIELD: An unsupported #EContactField was specified in the summary
 * @E_BOOK_SQLITE_ERROR_END_OF_LIST: An attempt was made to fetch results past the end of a contact list
 * @E_BOOK_SQLITE_ERROR_LOAD: An error occured while loading or creating the database
 *
 * Defines the types of possible errors reported by the #EBookSqlite
 */
typedef enum {
	E_BOOK_SQLITE_ERROR_ENGINE,
	E_BOOK_SQLITE_ERROR_CONSTRAINT,
	E_BOOK_SQLITE_ERROR_CONTACT_NOT_FOUND,
	E_BOOK_SQLITE_ERROR_INVALID_QUERY,
	E_BOOK_SQLITE_ERROR_UNSUPPORTED_QUERY,
	E_BOOK_SQLITE_ERROR_UNSUPPORTED_FIELD,
	E_BOOK_SQLITE_ERROR_END_OF_LIST,
	E_BOOK_SQLITE_ERROR_LOAD
} EBookSqliteError;

/**
 * EbSqlLockType:
 * @EBSQL_LOCK_READ: Obtain a lock for reading
 * @EBSQL_LOCK_WRITE: Obtain a lock for writing
 *
 * Indicates the type of lock requested in e_book_sqlite_lock()
 */
typedef enum {
	EBSQL_LOCK_READ,
	EBSQL_LOCK_WRITE
} EbSqlLockType;

/**
 * EbSqlUnlockAction:
 * @EBSQL_UNLOCK_NONE: Just unlock, this is appropriate for locks which were obtained with %EBSQL_LOCK_READ
 * @EBSQL_UNLOCK_COMMIT: Commit any modifications which were made while the lock was held
 * @EBSQL_UNLOCK_ROLLBACK: Rollback any modifications which were made while the lock was held
 *
 * Indicates what type of action to take while unlocking the sqlite with e_book_sqlite_unlock()
 *
 * In the case that some addressbook modification failed while holding an %EBSQL_LOCK_WRITE lock,
 * then the #EBookSqlite must be unlocked with %EBSQL_UNLOCK_ROLLBACK.
 */
typedef enum {
	EBSQL_UNLOCK_NONE,
	EBSQL_UNLOCK_COMMIT,
	EBSQL_UNLOCK_ROLLBACK
} EbSqlUnlockAction;

/**
 * EbSqlSearchData:
 * @uid: The %E_CONTACT_UID field of this contact
 * @vcard: The the vcard string
 * @extra: Any extra data associated to the vcard
 *
 * This structure is used to represent contacts returned
 * by the #EBookSqlite from various functions
 * such as e_book_sqlitedb_search().
 *
 * The @extra parameter will contain any data which was
 * previously passed for this contact in e_book_sqlite_add_contact().
 *
 * These should be freed with e_book_sqlite_search_data_free().
 *
 * Since: 3.12
 **/
typedef struct {
	gchar *uid;
	gchar *vcard;
	gchar *extra;
} EbSqlSearchData;

/**
 * EBookSqlite:
 *
 * Contains only private data that should be read and manipulated using the
 * functions below.
 *
 * Since: 3.12
 **/
struct _EBookSqlite {
	/*< private >*/
	GObject parent;
	EBookSqlitePrivate *priv;
};

/**
 * EBookSqliteClass:
 *
 * Class structure for the #EBookSqlite class.
 *
 * Since: 3.12
 */
struct _EBookSqliteClass {
	/*< private >*/
	GObjectClass parent_class;

	/* Signals */
	gboolean	(*before_insert_contact) (EBookSqlite *ebsql,
						  gpointer db, /* sqlite3 */
						  EContact *contact,
						  const gchar *extra,
						  gboolean replace,
						  GCancellable *cancellable,
						  GError **error);
	gboolean	(*before_remove_contact) (EBookSqlite *ebsql,
						  gpointer db, /* sqlite3 */
						  const gchar *contact_uid,
						  GCancellable *cancellable,
						  GError **error);
};

/**
 * EbSqlCursor:
 *
 * An opaque cursor pointer
 *
 * Since: 3.12
 */
typedef struct _EbSqlCursor EbSqlCursor;

/**
 * EbSqlCursorOrigin:
 * @EBSQL_CURSOR_ORIGIN_CURRENT:  The current cursor position
 * @EBSQL_CURSOR_ORIGIN_BEGIN:    The beginning of the cursor results.
 * @EBSQL_CURSOR_ORIGIN_END:      The ending of the cursor results.
 *
 * Specifies the start position to in the list of traversed contacts
 * in calls to e_book_sqlite_cursor_step().
 *
 * When an #EbSqlCursor is created, the current position implied by %EBSQL_CURSOR_ORIGIN_CURRENT
 * is the same as %EBSQL_CURSOR_ORIGIN_BEGIN.
 *
 * Since: 3.12
 */
typedef enum {
	EBSQL_CURSOR_ORIGIN_CURRENT = 0,
	EBSQL_CURSOR_ORIGIN_BEGIN,
	EBSQL_CURSOR_ORIGIN_END
} EbSqlCursorOrigin;

/**
 * EbSqlCursorStepFlags:
 * @EBSQL_CURSOR_STEP_MOVE:  The cursor position should be modified while stepping
 * @EBSQL_CURSOR_STEP_FETCH: Traversed contacts should be listed and returned while stepping.
 *
 * Defines the behaviour of e_book_sqlite_cursor_step().
 *
 * Since: 3.12
 */
typedef enum {
	EBSQL_CURSOR_STEP_MOVE = (1 << 0),
	EBSQL_CURSOR_STEP_FETCH = (1 << 1)
} EbSqlCursorStepFlags;

GType		e_book_sqlite_get_type		(void) G_GNUC_CONST;
GQuark		e_book_sqlite_error_quark	(void);
void		e_book_sqlite_search_data_free	(EbSqlSearchData *data);

EBookSqlite *	e_book_sqlite_new		(const gchar *path,
						 ESource *source,
						 GCancellable *cancellable,
						 GError **error);
EBookSqlite *	e_book_sqlite_new_full		(const gchar *path,
						 ESource *source,
						 ESourceBackendSummarySetup *setup,
						 EbSqlVCardCallback vcard_callback,
						 EbSqlChangeCallback change_callback,
						 gpointer user_data,
						 GDestroyNotify user_data_destroy,
						 GCancellable *cancellable,
						 GError **error);
gboolean	e_book_sqlite_lock		(EBookSqlite *ebsql,
						 EbSqlLockType lock_type,
						 GCancellable *cancellable,
						 GError **error);
gboolean	e_book_sqlite_unlock		(EBookSqlite *ebsql,
						 EbSqlUnlockAction action,
						 GError **error);
gboolean	e_book_sqlite_set_locale	(EBookSqlite *ebsql,
						 const gchar *lc_collate,
						 GCancellable *cancellable,
						 GError **error);
gboolean	e_book_sqlite_get_locale	(EBookSqlite *ebsql,
						 gchar **locale_out,
						 GError **error);

ECollator *	e_book_sqlite_ref_collator	(EBookSqlite *ebsql);

ESource *	e_book_sqlite_ref_source	(EBookSqlite *ebsql);

/* Adding / Removing / Searching contacts */
gboolean	e_book_sqlite_add_contact	(EBookSqlite *ebsql,
						 EContact *contact,
						 const gchar *extra,
						 gboolean replace,
						 GCancellable *cancellable,
						 GError **error);
gboolean	e_book_sqlite_add_contacts	(EBookSqlite *ebsql,
						 GSList *contacts,
						 GSList *extra,
						 gboolean replace,
						 GCancellable *cancellable,
						 GError **error);
gboolean	e_book_sqlite_remove_contact	(EBookSqlite *ebsql,
						 const gchar *uid,
						 GCancellable *cancellable,
						 GError **error);
gboolean	e_book_sqlite_remove_contacts	(EBookSqlite *ebsql,
						 GSList *uids,
						 GCancellable *cancellable,
						 GError **error);
gboolean	e_book_sqlite_has_contact	(EBookSqlite *ebsql,
						 const gchar *uid,
						 gboolean *exists,
						 GError **error);
gboolean	e_book_sqlite_get_contact	(EBookSqlite *ebsql,
						 const gchar *uid,
						 gboolean meta_contact,
						 EContact **ret_contact,
						 GError **error);
gboolean	ebsql_get_contact_unlocked	(EBookSqlite *ebsql,
						 const gchar *uid,
						 gboolean meta_contact,
						 EContact **contact,
						 GError **error);
gboolean	e_book_sqlite_get_vcard		(EBookSqlite *ebsql,
						 const gchar *uid,
						 gboolean meta_contact,
						 gchar **ret_vcard,
						 GError **error);
gboolean	ebsql_get_vcard_unlocked	(EBookSqlite *ebsql,
						 const gchar *uid,
						 gboolean meta_contact,
						 gchar **ret_vcard,
						 GError **error);
gboolean	e_book_sqlite_set_contact_extra	(EBookSqlite *ebsql,
						 const gchar *uid,
						 const gchar *extra,
						 GError **error);
gboolean	e_book_sqlite_get_contact_extra	(EBookSqlite *ebsql,
						 const gchar *uid,
						 gchar **ret_extra,
						 GError **error);
gboolean	ebsql_get_contact_extra_unlocked
						(EBookSqlite *ebsql,
						 const gchar *uid,
						 gchar **ret_extra,
						 GError **error);
gboolean	e_book_sqlite_search		(EBookSqlite *ebsql,
						 const gchar *sexp,
						 gboolean meta_contacts,
						 GSList **ret_list,
						 GCancellable *cancellable,
						 GError **error);
gboolean	e_book_sqlite_search_uids	(EBookSqlite *ebsql,
						 const gchar *sexp,
						 GSList **ret_list,
						 GCancellable *cancellable,
						 GError **error);

/* Key / Value convenience API */
gboolean	e_book_sqlite_get_key_value	(EBookSqlite *ebsql,
						 const gchar *key,
						 gchar **value,
						 GError **error);
gboolean	e_book_sqlite_set_key_value	(EBookSqlite *ebsql,
						 const gchar *key,
						 const gchar *value,
						 GError **error);
gboolean	e_book_sqlite_get_key_value_int	(EBookSqlite *ebsql,
						 const gchar *key,
						 gint *value,
						 GError **error);
gboolean	e_book_sqlite_set_key_value_int	(EBookSqlite *ebsql,
						 const gchar *key,
						 gint value,
						 GError **error);

/* Cursor API */
EbSqlCursor *	e_book_sqlite_cursor_new	(EBookSqlite *ebsql,
						 const gchar *sexp,
						 const EContactField *sort_fields,
						 const EBookCursorSortType *sort_types,
						 guint n_sort_fields,
						 GError **error);
void		e_book_sqlite_cursor_free	(EBookSqlite *ebsql,
						 EbSqlCursor *cursor);
gint		e_book_sqlite_cursor_step	(EBookSqlite *ebsql,
						 EbSqlCursor *cursor,
						 EbSqlCursorStepFlags flags,
						 EbSqlCursorOrigin origin,
						 gint count,
						 GSList **results,
						 GCancellable *cancellable,
						 GError **error);
void		e_book_sqlite_cursor_set_target_alphabetic_index
						(EBookSqlite *ebsql,
						 EbSqlCursor *cursor,
						 gint idx);
gboolean	e_book_sqlite_cursor_set_sexp	(EBookSqlite *ebsql,
						 EbSqlCursor *cursor,
						 const gchar *sexp,
						 GError **error);
gboolean	e_book_sqlite_cursor_calculate	(EBookSqlite *ebsql,
						 EbSqlCursor *cursor,
						 gint *total,
						 gint *position,
						 GCancellable *cancellable,
						 GError **error);
gint		e_book_sqlite_cursor_compare_contact
						(EBookSqlite *ebsql,
						 EbSqlCursor *cursor,
						 EContact *contact,
						 gboolean *matches_sexp);

/**
 * EBookSqliteSelectFunc:
 * @ebsql: an #EBookSqlite
 * @ncols: count of columns, items in column_names and column_values
 * @column_names: (array length=ncols) (element-type utf8): column names
 * @column_values: (array length=ncols) (element-type utf8): column values
 * @user_data: user data, as used in e_book_sqlite_select()
 *
 * A callback called for each row of a SELECT statement executed
 * with e_book_sqlite_select() function.
 *
 * Returns: %TRUE to continue, %FALSE to stop walk through.
 *
 * Since: 3.48
 **/
typedef gboolean (* EBookSqliteSelectFunc)	(EBookSqlite *ebsql,
						 gint ncols,
						 const gchar *column_names[],
						 const gchar *column_values[],
						 gpointer user_data);

gboolean	e_book_sqlite_exec		(EBookSqlite *ebsql,
						 const gchar *sql_stmt,
						 GCancellable *cancellable,
						 GError **error);
gboolean	e_book_sqlite_select		(EBookSqlite *ebsql,
						 const gchar *sql_stmt,
						 EBookSqliteSelectFunc func,
						 gpointer user_data,
						 GCancellable *cancellable,
						 GError **error);

gboolean	e_book_sqlite_count_query	(EBookSqlite *ebsql,
						 const gchar *sexp,
						 guint *out_n_total,
						 GCancellable *cancellable,
						 GError **error);
gboolean	e_book_sqlite_dup_query_field	(EBookSqlite *ebsql,
						 EContactField summary_field,
						 const gchar *sexp,
						 EContactField sort_field,
						 EBookCursorSortType sort_type,
						 guint n_offset,
						 guint n_limit,
						 GPtrArray **out_uids, /* gchar * */
						 GPtrArray **out_values, /* gchar * */
						 GCancellable *cancellable,
						 GError **error);
gboolean	e_book_sqlite_dup_query_contacts(EBookSqlite *ebsql,
						 const gchar *sexp,
						 EContactField sort_field,
						 EBookCursorSortType sort_type,
						 guint n_offset,
						 guint n_limit,
						 GPtrArray **out_contacts, /* EContact * */
						 GCancellable *cancellable,
						 GError **error);
gboolean	e_book_sqlite_dup_summary_field	(EBookSqlite *ebsql,
						 EContactField summary_field,
						 const gchar *uid,
						 gchar **out_value,
						 GCancellable *cancellable,
						 GError **error);
G_END_DECLS

#endif /* E_BOOK_SQLITE_H */