package com.ankurm.expandcontract;

import com.ankurm.expandcontract.customer.CustomerService;
import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.io.TempDir;

import java.nio.file.Path;
import java.sql.Connection;
import java.sql.DriverManager;

import static org.assertj.core.api.Assertions.assertThat;

/**
 * Deploy 2 (MIGRATE WRITES): Stage 2 code writes every create and update to both
 * columns. This is the deploy that makes Deploy 3's read switch safe later - if this
 * one is wrong, nothing downstream can be trusted. See docs/04-the-dual-write.md.
 */
class DualWriteConsistencyTest {

    @Test
    void createAndUpdatePopulateBothColumnsIdentically(@TempDir Path tmp) throws Exception {
        Path db = tmp.resolve("dual-write");
        TestSupport.migrateTo(db, "2");
        Transcript t = Transcript.start("04-dual-write-consistency",
                "Deploy 2 (MIGRATE WRITES): Stage 2 writes land in both columns");

        CustomerService stage2 = new CustomerService(TestSupport.jdbcClient(db), 2);
        long id = stage2.create("Margaret Hamilton", "margaret@example.test");

        try (Connection conn = DriverManager.getConnection(TestSupport.jdbcUrl(db), "sa", "")) {
            t.section("after create()");
            String row = DbDump.table(conn, "select name, email, email_address from customers where id = " + id);
            t.line(row);
            assertThat(row).contains("margaret@example.test");
            assertThat(row.indexOf("margaret@example.test")).isNotEqualTo(row.lastIndexOf("margaret@example.test"));
        }

        stage2.updateEmail(id, "m.hamilton@example.test");

        try (Connection conn = DriverManager.getConnection(TestSupport.jdbcUrl(db), "sa", "")) {
            t.section("after updateEmail() - the old value is gone from BOTH columns, not just one");
            String row = DbDump.table(conn, "select name, email, email_address from customers where id = " + id);
            t.line(row);
            assertThat(row).contains("m.hamilton@example.test").doesNotContain("margaret@example.test");
        }

        t.write();
    }
}