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/*
 * Purple - Internet Messaging Library
 * Copyright (C) Pidgin Developers <devel@pidgin.im>
 *
 * Purple is the legal property of its developers, whose names are too numerous
 * to list here. Please refer to the COPYRIGHT file distributed with this
 * source distribution.
 *
 * This library 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 2 of the License, or (at your option)
 * any later version.
 *
 * 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 General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this library; if not, see <https://www.gnu.org/licenses/>.
 */

#include <glib/gi18n-lib.h>

#include <sqlite3.h>
#include <seagull.h>

#include "purplesqlitehistoryadapter.h"

#include "purpleaccount.h"
#include "purpleaccountmanager.h"
#include "purpleconversationmanager.h"
#include "purpleconversationmember.h"
#include "purpleconversationmembers.h"

struct _PurpleSqliteHistoryAdapter {
	PurpleHistoryAdapter parent;

	gchar *filename;
	sqlite3 *db;
};

enum {
	PROP_0,
	PROP_FILENAME,
	N_PROPERTIES,
};
static GParamSpec *properties[N_PROPERTIES] = {NULL, };

G_DEFINE_FINAL_TYPE(PurpleSqliteHistoryAdapter, purple_sqlite_history_adapter,
                    PURPLE_TYPE_HISTORY_ADAPTER)

/******************************************************************************
 * Helpers
 *****************************************************************************/
static void
purple_sqlite_history_adapter_set_filename(PurpleSqliteHistoryAdapter *adapter,
                                           const gchar *filename)
{
	if(g_set_str(&adapter->filename, filename)) {
		g_object_notify_by_pspec(G_OBJECT(adapter), properties[PROP_FILENAME]);
	}
}

static gboolean
purple_sqlite_history_adapter_run_migrations(PurpleSqliteHistoryAdapter *adapter,
                                             GError **error)
{
	const char *path = "/im/pidgin/libpurple/sqlitehistoryadapter";
	const char *migrations[] = {
		"01-schema.sql",
		NULL
	};

	return seagull_migrations_run_from_resources(adapter->db, path, migrations,
	                                             error);
}

static sqlite3_stmt *
purple_sqlite_history_adapter_build_query(PurpleSqliteHistoryAdapter *adapter,
                                          const gchar * search_query,
                                          gboolean remove,
                                          GError **error)
{
	gchar **split = NULL;
	gint i = 0;
	GList *ins = NULL;
	GList *froms = NULL;
	GList *keywords = NULL;
	GString *query = NULL;
	GList *iter = NULL;
	gboolean first = FALSE;
	sqlite3_stmt *prepared_statement = NULL;
	gint index = 1;
	gint query_items = 0;

	split = g_strsplit(search_query, " ", -1);
	for(i = 0; split[i] != NULL; i++) {
		if(g_str_has_prefix(split[i], "in:")) {
			if(split[i][3] == '\0') {
				continue;
			}
			ins = g_list_prepend(ins, g_strdup(split[i]+3));
			query_items++;
		} else if(g_str_has_prefix(split[i], "from:")) {
			if(split[i][5] == '\0') {
				continue;
			}
			froms = g_list_prepend(froms, g_strdup(split[i]+5));
			query_items++;
		} else {
			if(split[i][0] == '\0') {
				continue;
			}
			keywords = g_list_prepend(keywords,
			                          g_strdup_printf("%%%s%%", split[i]));
			query_items++;
		}
	}

	g_clear_pointer(&split, g_strfreev);

	if(remove) {
		if(query_items != 0) {
			query = g_string_new("DELETE FROM message_log WHERE TRUE\n");
		} else {
			g_set_error(error, PURPLE_HISTORY_ADAPTER_DOMAIN, 0,
			            "Attempting to remove messages without "
			            "query parameters.");

			return NULL;
		}
	} else {
		query = g_string_new("SELECT "
		                     "account, conversation_id, message_id, author, "
		                     "author_name_color, author_alias, content, "
		                     "client_timestamp "
		                     "FROM message_log WHERE TRUE\n");
	}

	if(ins != NULL) {
		first = TRUE;
		g_string_append(query, "AND (conversation_id IN (");
		for(iter = ins; iter != NULL; iter = iter->next) {
			if(!first) {
				g_string_append(query, ", ");
			}
			first = FALSE;
			g_string_append(query, "?");
		}
		g_string_append(query, "))");
	}

	if(froms != NULL) {
		first = TRUE;
		g_string_append(query, "AND (author IN (");
		for(iter = froms; iter != NULL; iter = iter->next) {
			if(!first) {
				g_string_append(query, ", ");
			}
			first = FALSE;
			g_string_append(query, "?");
		}
		g_string_append(query, "))");
	}

	if(keywords != NULL) {
		first = TRUE;
		g_string_append(query, "AND (");
		for(iter = keywords; iter != NULL; iter = iter->next) {
			if(!first) {
				g_string_append(query, " OR ");
			}
			first = FALSE;
			g_string_append(query, " content LIKE ? ");
		}
		g_string_append(query, ")");
	}
	g_string_append(query, ";");

	sqlite3_prepare_v2(adapter->db, query->str, -1, &prepared_statement, NULL);

	g_string_free(query, TRUE);

	if(prepared_statement == NULL) {
		g_set_error(error, PURPLE_HISTORY_ADAPTER_DOMAIN, 0,
		            "Error creating the prepared statement: %s",
		            sqlite3_errmsg(adapter->db));

		g_list_free_full(ins, g_free);
		g_list_free_full(froms, g_free);
		g_list_free_full(keywords, g_free);

		return NULL;
	}

	while(ins != NULL) {
		sqlite3_bind_text(prepared_statement, index++,
		                  (const char *)ins->data, -1, g_free);
		ins = g_list_delete_link(ins, ins);
	}

	while(froms != NULL) {
		sqlite3_bind_text(prepared_statement, index++,
		                  (const char *)froms->data, -1, g_free);
		froms = g_list_delete_link(froms, froms);
	}

	while(keywords != NULL) {
		sqlite3_bind_text(prepared_statement, index++,
		                  (const char *)keywords->data, -1, g_free);
		keywords = g_list_delete_link(keywords, keywords);
	}

	return prepared_statement;
}

/******************************************************************************
 * PurpleHistoryAdapter Implementation
 *****************************************************************************/
static gboolean
purple_sqlite_history_adapter_activate(PurpleHistoryAdapter *adapter,
                                       GError **error)
{
	PurpleSqliteHistoryAdapter *sqlite_adapter = NULL;
	gint rc = 0;

	sqlite_adapter = PURPLE_SQLITE_HISTORY_ADAPTER(adapter);

	if(sqlite_adapter->db != NULL) {
		g_set_error_literal(error, PURPLE_HISTORY_ADAPTER_DOMAIN, 0,
		                    _("Adapter has already been activated"));

		return FALSE;
	}

	if(sqlite_adapter->filename == NULL) {
		g_set_error_literal(error, PURPLE_HISTORY_ADAPTER_DOMAIN, 0,
		                    _("No filename specified"));

		return FALSE;
	}

	rc = sqlite3_open(sqlite_adapter->filename, &sqlite_adapter->db);
	if(rc != SQLITE_OK) {
		g_set_error(error, PURPLE_HISTORY_ADAPTER_DOMAIN, 0,
		            _("Error opening database in purplesqlitehistoryadapter for file %s"),
		            sqlite_adapter->filename);
		g_clear_pointer(&sqlite_adapter->db, sqlite3_close);

		return FALSE;
	}

	if(!purple_sqlite_history_adapter_run_migrations(sqlite_adapter, error)) {
		g_clear_pointer(&sqlite_adapter->db, sqlite3_close);

		return FALSE;
	}

	return TRUE;
}

static gboolean
purple_sqlite_history_adapter_deactivate(PurpleHistoryAdapter *adapter,
                                         G_GNUC_UNUSED GError **error)
{
	PurpleSqliteHistoryAdapter *sqlite_adapter = NULL;

	sqlite_adapter = PURPLE_SQLITE_HISTORY_ADAPTER(adapter);
	g_clear_pointer(&sqlite_adapter->db, sqlite3_close);

	return TRUE;
}

static GList*
purple_sqlite_history_adapter_query(PurpleHistoryAdapter *adapter,
                                    const char *query, GError **error)
{
	PurpleAccountManager *account_manager = NULL;
	PurpleConversationManager *conversation_manager = NULL;
	PurpleSqliteHistoryAdapter *sqlite_adapter = NULL;
	sqlite3_stmt *prepared_statement = NULL;
	GList *results = NULL;

	sqlite_adapter = PURPLE_SQLITE_HISTORY_ADAPTER(adapter);

	if(sqlite_adapter->db == NULL) {
		g_set_error_literal(error, PURPLE_HISTORY_ADAPTER_DOMAIN, 0,
		                    _("Adapter has not been activated"));

		return FALSE;
	}

	prepared_statement = purple_sqlite_history_adapter_build_query(sqlite_adapter,
	                                                               query,
	                                                               FALSE,
	                                                               error);

	if(prepared_statement == NULL) {
		return NULL;
	}

	account_manager = purple_account_manager_get_default();
	conversation_manager = purple_conversation_manager_get_default();

	while(sqlite3_step(prepared_statement) == SQLITE_ROW) {
		PurpleAccount *account = NULL;
		PurpleContactInfo *info = NULL;
		PurpleConversation *conversation = NULL;
		PurpleConversationMember *member = NULL;
		PurpleMessage *message = NULL;
		GDateTime *g_date_time = NULL;
		const char *account_id = NULL;
		const char *author = NULL;
		const char *author_alias = NULL;
		const char *content = NULL;
		const char *conversation_id = NULL;
		const char *message_id = NULL;
		const char *timestamp = NULL;

		account_id = (const char *)sqlite3_column_text(prepared_statement, 0);
		conversation_id = (const char *)sqlite3_column_text(prepared_statement, 1);
		message_id = (const char *)sqlite3_column_text(prepared_statement, 2);
		author = (const char *)sqlite3_column_text(prepared_statement, 3);
		author_alias = (const char *)sqlite3_column_text(prepared_statement, 4);
		content = (const char *)sqlite3_column_text(prepared_statement, 5);
		timestamp = (const char *)sqlite3_column_text(prepared_statement, 6);
		g_date_time = g_date_time_new_from_iso8601(timestamp, NULL);

		/* This is gross but necessary until we finish rethinking history.
		 * -- gk 2024-08-21
		 * -- gk 2024-12-02
		 */

		account = purple_account_manager_find_by_id(account_manager,
		                                            account_id);
		if(!PURPLE_IS_ACCOUNT(account)) {
			account = g_object_new(
				PURPLE_TYPE_ACCOUNT,
				"id", account_id,
				NULL);
			purple_account_manager_add(account_manager, account);
			g_object_unref(account);
		}

		conversation = purple_conversation_manager_find_with_id(conversation_manager,
		                                                        account,
		                                                        conversation_id);
		if(!PURPLE_IS_CONVERSATION(conversation)) {
			conversation = g_object_new(
				PURPLE_TYPE_CONVERSATION,
				"id", conversation_id,
				NULL);
			purple_conversation_manager_add(conversation_manager, conversation);

			/* The manager holds a reference which we will use for now. */
			g_object_unref(conversation);
		}

		info = purple_contact_info_new(author);
		purple_contact_info_set_alias(info, author_alias);

		member = purple_conversation_find_or_add_member(conversation, info,
		                                                FALSE, NULL);

		message = purple_message_new(member, content);
		purple_message_set_id(message, message_id);
		purple_message_set_timestamp(message, g_date_time);

		results = g_list_prepend(results, message);

		g_clear_object(&info);
	}

	results = g_list_reverse(results);

	sqlite3_finalize(prepared_statement);

	return results;
}

static gboolean
purple_sqlite_history_adapter_remove(PurpleHistoryAdapter *adapter,
                                     const gchar *query, GError **error)
{
	PurpleSqliteHistoryAdapter *sqlite_adapter = NULL;
	sqlite3_stmt * prepared_statement = NULL;
	gint result = 0;

	sqlite_adapter = PURPLE_SQLITE_HISTORY_ADAPTER(adapter);

	if(sqlite_adapter->db == NULL) {
		g_set_error_literal(error, PURPLE_HISTORY_ADAPTER_DOMAIN, 0,
		                    _("Adapter has not been activated"));

		return FALSE;
	}

	prepared_statement = purple_sqlite_history_adapter_build_query(sqlite_adapter,
	                                                               query,
	                                                               TRUE,
	                                                               error);

	if(prepared_statement == NULL) {
		return FALSE;
	}

	result = sqlite3_step(prepared_statement);

	if(result != SQLITE_DONE) {
		g_set_error(error, PURPLE_HISTORY_ADAPTER_DOMAIN, 0,
		            "Error removing from the database: %s",
		            sqlite3_errmsg(sqlite_adapter->db));

		sqlite3_finalize(prepared_statement);

		return FALSE;
	}

	sqlite3_finalize(prepared_statement);

	return TRUE;
}

static gboolean
purple_sqlite_history_adapter_write(PurpleHistoryAdapter *adapter,
                                    PurpleConversation *conversation,
                                    PurpleMessage *message, GError **error)
{
	PurpleAccount *account = NULL;
	PurpleContactInfo *info = NULL;
	PurpleConversationMember *author = NULL;
	PurpleProtocol *protocol = NULL;
	PurpleSqliteHistoryAdapter *sqlite_adapter = NULL;
	sqlite3_stmt *prepared_statement = NULL;
	gchar *timestamp = NULL;
	const char * message_id = NULL;
	const char *script = NULL;
	int result = 0;

	script = "INSERT INTO message_log(protocol, account, conversation_id, "
			 "message_id, author, author_alias, "
			 "content, client_timestamp) "
	         "VALUES(?, ?, ?, ?, ?, ?, ?, ?)";

	sqlite_adapter = PURPLE_SQLITE_HISTORY_ADAPTER(adapter);

	if(sqlite_adapter->db == NULL) {
		g_set_error_literal(error, PURPLE_HISTORY_ADAPTER_DOMAIN, 0,
		                    _("Adapter has not been activated"));

		return FALSE;
	}

	sqlite3_prepare_v2(sqlite_adapter->db, script, -1, &prepared_statement, NULL);

	if(prepared_statement == NULL) {
		g_set_error(error, PURPLE_HISTORY_ADAPTER_DOMAIN, 0,
		            "Error creating the prepared statement: %s",
		            sqlite3_errmsg(sqlite_adapter->db));
		return FALSE;
	}

	account = purple_conversation_get_account(conversation);
	protocol = purple_account_get_protocol(account);
	author = purple_message_get_author(message);
	info = purple_conversation_member_get_contact_info(author);

	sqlite3_bind_text(prepared_statement,
	                  1, purple_protocol_get_name(protocol), -1,
	                  SQLITE_STATIC);
	sqlite3_bind_text(prepared_statement,
	                  2, purple_account_get_username(account), -1,
	                  SQLITE_STATIC);
	sqlite3_bind_text(prepared_statement,
	                  3, purple_conversation_get_global_id(conversation), -1,
	                  g_free);
	message_id = purple_message_get_id(message);
	if(message_id != NULL) {
		sqlite3_bind_text(prepared_statement, 4, message_id, -1,
		                  SQLITE_STATIC);
	} else {
		sqlite3_bind_text(prepared_statement, 4, g_uuid_string_random(), -1,
		                  g_free);
	}
	sqlite3_bind_text(prepared_statement,
	                  5, purple_contact_info_get_id(info), -1,
	                  SQLITE_STATIC);
	sqlite3_bind_text(prepared_statement,
	                  6, purple_conversation_member_get_name_for_display(author), -1,
	                  SQLITE_STATIC);
	sqlite3_bind_text(prepared_statement,
	                  7, purple_message_get_contents(message), -1,
	                  SQLITE_STATIC);
	timestamp = g_date_time_format_iso8601(purple_message_get_timestamp(message));
	sqlite3_bind_text(prepared_statement, 8, timestamp, -1, g_free);

	result = sqlite3_step(prepared_statement);

	if(result != SQLITE_DONE) {
		g_set_error(error, PURPLE_HISTORY_ADAPTER_DOMAIN, 0,
		            "Error writing to the database: %s",
		            sqlite3_errmsg(sqlite_adapter->db));

		sqlite3_finalize(prepared_statement);

		return FALSE;
	}

	sqlite3_finalize(prepared_statement);

	return TRUE;
}

/******************************************************************************
 * GObject Implementation
 *****************************************************************************/
static void
purple_sqlite_history_adapter_get_property(GObject *obj, guint param_id,
                                           GValue *value, GParamSpec *pspec)
{
	PurpleSqliteHistoryAdapter *adapter = PURPLE_SQLITE_HISTORY_ADAPTER(obj);

	switch(param_id) {
		case PROP_FILENAME:
			g_value_set_string(value,
			                   purple_sqlite_history_adapter_get_filename(adapter));
			break;
		default:
			G_OBJECT_WARN_INVALID_PROPERTY_ID(obj, param_id, pspec);
			break;
	}
}

static void
purple_sqlite_history_adapter_set_property(GObject *obj, guint param_id,
                                           const GValue *value,
                                           GParamSpec *pspec)
{
	PurpleSqliteHistoryAdapter *adapter = PURPLE_SQLITE_HISTORY_ADAPTER(obj);

	switch(param_id) {
		case PROP_FILENAME:
			purple_sqlite_history_adapter_set_filename(adapter,
			                                           g_value_get_string(value));
			break;
		default:
			G_OBJECT_WARN_INVALID_PROPERTY_ID(obj, param_id, pspec);
			break;
	}
}

static void
purple_sqlite_history_adapter_finalize(GObject *obj) {
	PurpleSqliteHistoryAdapter *adapter = NULL;

	adapter = PURPLE_SQLITE_HISTORY_ADAPTER(obj);

	g_clear_pointer(&adapter->filename, g_free);

	if(adapter->db != NULL) {
		g_warning("PurpleSqliteHistoryAdapter was finalized before being "
		          "deactivated");

		g_clear_pointer(&adapter->db, sqlite3_close);
	}

	G_OBJECT_CLASS(purple_sqlite_history_adapter_parent_class)->finalize(obj);
}

static void
purple_sqlite_history_adapter_init(G_GNUC_UNUSED PurpleSqliteHistoryAdapter *adapter)
{
}

static void
purple_sqlite_history_adapter_class_init(PurpleSqliteHistoryAdapterClass *klass)
{
	GObjectClass *obj_class = G_OBJECT_CLASS(klass);
	PurpleHistoryAdapterClass *adapter_class = PURPLE_HISTORY_ADAPTER_CLASS(klass);

	obj_class->get_property = purple_sqlite_history_adapter_get_property;
	obj_class->set_property = purple_sqlite_history_adapter_set_property;
	obj_class->finalize = purple_sqlite_history_adapter_finalize;

	adapter_class->activate = purple_sqlite_history_adapter_activate;
	adapter_class->deactivate = purple_sqlite_history_adapter_deactivate;
	adapter_class->query = purple_sqlite_history_adapter_query;
	adapter_class->remove = purple_sqlite_history_adapter_remove;
	adapter_class->write = purple_sqlite_history_adapter_write;

	/**
	 * PurpleSqliteHistoryAdapter:filename:
	 *
	 * The filename that the sqlite database will store data to.
	 *
	 * Since: 3.0
	 */
	properties[PROP_FILENAME] = g_param_spec_string(
		"filename", NULL, NULL,
		NULL,
		G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY | G_PARAM_STATIC_STRINGS
	);

	g_object_class_install_properties(obj_class, N_PROPERTIES, properties);
}

/******************************************************************************
 * Public API
 *****************************************************************************/
PurpleHistoryAdapter *
purple_sqlite_history_adapter_new(const gchar *filename) {
	return g_object_new(
		PURPLE_TYPE_SQLITE_HISTORY_ADAPTER,
		"filename", filename,
		"id", "sqlite-adapter",
		"name", N_("SQLite Adapter"),
		NULL);
}

const gchar *
purple_sqlite_history_adapter_get_filename(PurpleSqliteHistoryAdapter *adapter)
{
	PurpleSqliteHistoryAdapter *sqlite_adapter = NULL;

	g_return_val_if_fail(PURPLE_IS_SQLITE_HISTORY_ADAPTER(adapter), NULL);

	sqlite_adapter = PURPLE_SQLITE_HISTORY_ADAPTER(adapter);

	return sqlite_adapter->filename;
}