import java.io.FileInputStream;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.Statement;
import java.util.Properties;

public class FkCheck {
    public static void main(String[] args) throws Exception {
        Properties props = new Properties();
        try (FileInputStream in = new FileInputStream(args[0])) {
            props.load(in);
        }
        String url = props.getProperty("url");
        String user = props.getProperty("username");
        String pass = props.getProperty("password");

        System.out.println("Connecting to: " + url);
        Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
        try (Connection conn = DriverManager.getConnection(url, user, pass)) {
            System.out.println("CONNECTED: " + conn.getMetaData().getDatabaseProductName()
                    + " " + conn.getMetaData().getDatabaseProductVersion());

            // 1. Total FK count
            try (Statement st = conn.createStatement();
                 ResultSet rs = st.executeQuery("SELECT COUNT(*) FROM sys.foreign_keys")) {
                rs.next();
                System.out.println("TOTAL_FK_COUNT=" + rs.getInt(1));
            }

            // 2. FK status summary (disabled / not trusted / not for replication)
            System.out.println("--- FK STATUS ---");
            try (Statement st = conn.createStatement();
                 ResultSet rs = st.executeQuery(
                     "SELECT name, is_disabled, is_not_trusted, is_not_for_replication, create_date " +
                     "FROM sys.foreign_keys ORDER BY name")) {
                while (rs.next()) {
                    System.out.printf("FK=%s disabled=%s not_trusted=%s not_for_repl=%s created=%s%n",
                            rs.getString("name"), rs.getBoolean("is_disabled"),
                            rs.getBoolean("is_not_trusted"), rs.getBoolean("is_not_for_replication"),
                            rs.getTimestamp("create_date"));
                }
            }

            // 3. FK delete/update actions
            System.out.println("--- FK ACTIONS ---");
            String actSql =
                "SELECT fk.name, OBJECT_NAME(fk.parent_object_id) AS parent_table, " +
                "       fk.delete_referential_action_desc AS del_action, " +
                "       fk.update_referential_action_desc AS upd_action " +
                "FROM sys.foreign_keys fk ORDER BY parent_table, fk.name";
            try (Statement st = conn.createStatement();
                 ResultSet rs = st.executeQuery(actSql)) {
                while (rs.next()) {
                    System.out.printf("%s (%s): ON DELETE %s, ON UPDATE %s%n",
                            rs.getString("name"), rs.getString("parent_table"),
                            rs.getString("del_action"), rs.getString("upd_action"));
                }
            }

            // 4. FK details: parent/child columns
            System.out.println("--- FK DETAILS ---");
            String sql =
                "SELECT fk.name AS fk_name, " +
                "       OBJECT_NAME(fk.parent_object_id) AS parent_table, " +
                "       OBJECT_NAME(fk.referenced_object_id) AS ref_table, " +
                "       pc.name AS parent_col, rc.name AS ref_col, fkc.constraint_column_id AS ord " +
                "FROM sys.foreign_keys fk " +
                "JOIN sys.foreign_key_columns fkc ON fkc.constraint_object_id = fk.object_id " +
                "JOIN sys.columns pc ON pc.object_id = fk.parent_object_id AND pc.column_id = fkc.parent_column_id " +
                "JOIN sys.columns rc ON rc.object_id = fk.referenced_object_id AND rc.column_id = fkc.referenced_column_id " +
                "ORDER BY parent_table, fk.name, ord";
            try (Statement st = conn.createStatement();
                 ResultSet rs = st.executeQuery(sql)) {
                while (rs.next()) {
                    System.out.printf("%s: %s(%s) -> %s(%s)%n",
                            rs.getString("fk_name"), rs.getString("parent_table"),
                            rs.getString("parent_col"), rs.getString("ref_table"),
                            rs.getString("ref_col"));
                }
            }
        }
    }
}