/*
 * database.h
 * vim: expandtab:ts=4:sts=4:sw=4
 *
 * Copyright (C) 2020 - 2026 Michael Vetter <jubalh@iodoru.org>
 *
 * SPDX-License-Identifier: GPL-3.0-or-later WITH OpenSSL-exception
 */

#ifndef DATABASE_H
#define DATABASE_H

#include <glib.h>
#include "config/account.h"
#include "xmpp/xmpp.h"

#define MESSAGES_TO_RETRIEVE 100

typedef enum {
    DB_RESPONSE_ERROR,
    DB_RESPONSE_EMPTY,
    DB_RESPONSE_SUCCESS
} db_history_result_t;

// Integrity verification issue levels
typedef enum {
    INTEGRITY_ERROR,
    INTEGRITY_WARNING,
    INTEGRITY_INFO
} integrity_level_t;

// A single integrity issue found during verification
typedef struct
{
    integrity_level_t level;
    char* file;
    int line;
    char* message;
} integrity_issue_t;

void integrity_issue_free(integrity_issue_t* issue);

// Backend vtable: pluggable storage backends implement this interface
typedef struct db_backend_t
{
    const char* name;
    gboolean (*init)(ProfAccount* account);
    void (*close)(void);
    void (*add_incoming)(ProfMessage* message);
    void (*add_outgoing_chat)(const char* const id, const char* const barejid, const char* const message, const char* const replace_id, prof_enc_t enc);
    void (*add_outgoing_muc)(const char* const id, const char* const barejid, const char* const message, const char* const replace_id, prof_enc_t enc);
    void (*add_outgoing_muc_pm)(const char* const id, const char* const barejid, const char* const message, const char* const replace_id, prof_enc_t enc);
    db_history_result_t (*get_previous_chat)(const gchar* const contact_barejid, const gchar* start_time, const gchar* end_time, gboolean from_start, gboolean flip, GSList** result);
    ProfMessage* (*get_limits_info)(const gchar* const contact_barejid, gboolean is_last);
    GSList* (*verify_integrity)(const gchar* const contact_barejid);
} db_backend_t;

// Active backend (set during init based on PREF_DBLOG)
extern db_backend_t* active_db_backend;

// Backend registry
#ifdef HAVE_SQLITE
db_backend_t* db_backend_sqlite(void);
GSList* db_sqlite_list_contacts(void);
GSList* db_sqlite_get_all_chat(const gchar* const contact_barejid);
void db_sqlite_begin_transaction(void);
void db_sqlite_end_transaction(void);
void db_sqlite_rollback_transaction(void);
int db_sqlite_last_changes(void);
gboolean db_sqlite_is_open(void);
#endif
db_backend_t* db_backend_flatfile(void);

// Public API (dispatches to active_db_backend)
gboolean log_database_init(ProfAccount* account);
gboolean log_database_switch_backend(const char* new_backend);
void log_database_add_incoming(ProfMessage* message);
void log_database_add_outgoing_chat(const char* const id, const char* const barejid, const char* const message, const char* const replace_id, prof_enc_t enc);
void log_database_add_outgoing_muc(const char* const id, const char* const barejid, const char* const message, const char* const replace_id, prof_enc_t enc);
void log_database_add_outgoing_muc_pm(const char* const id, const char* const barejid, const char* const message, const char* const replace_id, prof_enc_t enc);
db_history_result_t log_database_get_previous_chat(const gchar* const contact_barejid, const gchar* start_time, const gchar* end_time, gboolean from_start, gboolean flip, GSList** result);
ProfMessage* log_database_get_limits_info(const gchar* const contact_barejid, gboolean is_last);
void log_database_close(void);
GSList* log_database_verify_integrity(const gchar* const contact_barejid);

// FALSE if no backend, or PREF_DBLOG is "off" / "redact".
gboolean log_database_can_recover_messages(void);

// Cross-backend export/import (requires HAVE_SQLITE)
#ifdef HAVE_SQLITE
int log_database_export_to_flatfile(const gchar* const contact_jid);
int log_database_import_from_flatfile(const gchar* const contact_jid);
#endif

#endif // DATABASE_H