"use strict";
var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
    function adopt(value) { return value instanceof P ? value : new P(function (resolve) { resolve(value); }); }
    return new (P || (P = Promise))(function (resolve, reject) {
        function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
        function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
        function step(result) { result.done ? resolve(result.value) : adopt(result.value).then(fulfilled, rejected); }
        step((generator = generator.apply(thisArg, _arguments || [])).next());
    });
};
var __importDefault = (this && this.__importDefault) || function (mod) {
    return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
const mysql_1 = __importDefault(require("mysql"));
const child_process_1 = require("child_process");
const util_1 = require("util");
function getConnection(config) {
    return mysql_1.default.createConnection(config);
}
function getMasterStatus(config) {
    return new Promise((resolve, reject) => {
        const connection = getConnection(config);
        connection.query("SHOW MASTER STATUS", (error, results) => {
            connection.end();
            if (error)
                reject(error);
            else
                resolve(results[0]);
        });
    });
}
function syncDatabases() {
    return __awaiter(this, void 0, void 0, function* () {
        const config = {
            host: "localhost",
            user: "root",
            password: "your_password",
        };
        let lastPosition = null; // Track last synced position
        while (true) {
            try {
                // Get current master status
                const { File, Position } = yield getMasterStatus(config);
                // Determine start position (use lastPosition or 4 if first run)
                const startPosition = lastPosition !== null ? lastPosition + 1 : 4;
                if (startPosition >= Position) {
                    yield new Promise((resolve) => setTimeout(resolve, 5000)); // Wait 5 seconds if no new changes
                    continue;
                }
                // Execute mysqlbinlog to get changes
                const execPromise = (0, util_1.promisify)(child_process_1.exec);
                const { stdout } = yield execPromise(`mysqlbinlog --database=db_master ${File} --start-position=${startPosition} --stop-position=${Position}`);
                if (stdout) {
                    const connection = getConnection(Object.assign(Object.assign({}, config), { database: "db_slave" }));
                    return new Promise((resolve, reject) => {
                        connection.query(stdout, (error) => {
                            connection.end();
                            if (error)
                                reject(error);
                            else {
                                lastPosition = Position;
                                console.log(`Synced up to position ${Position} at ${new Date().toISOString()}`);
                                resolve(null);
                            }
                        });
                    });
                }
            }
            catch (error) {
                console.error("Sync error:", error);
            }
            yield new Promise((resolve) => setTimeout(resolve, 5000)); // Check every 5 seconds
        }
    });
}
// Initialize db_slave with db_master data
function initializeSlave() {
    return __awaiter(this, void 0, void 0, function* () {
        const config = {
            host: "localhost",
            user: "root",
            password: "your_password",
        };
        try {
            yield (0, util_1.promisify)(child_process_1.exec)(`mysqldump -u ${config.user} -p${config.password} db_master > db_master_backup.sql`);
            yield (0, util_1.promisify)(child_process_1.exec)(`mysql -u ${config.user} -p${config.password} db_slave < db_master_backup.sql`);
            console.log("Slave initialized with master data");
        }
        catch (error) {
            console.error("Initialization error:", error);
        }
    });
}
// Run the sync process
function main() {
    return __awaiter(this, void 0, void 0, function* () {
        yield initializeSlave();
        yield syncDatabases();
    });
}
main().catch(console.error);