package dev.caskeleton.adapter.outbound.persistence.notification;

import dev.caskeleton.adapter.outbound.persistence.platform.JpaPlatformContractSupport;
import java.io.IOException;
import java.io.InputStream;
import java.nio.charset.StandardCharsets;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.List;
import java.util.Set;
import java.util.TreeSet;
import org.junit.jupiter.api.Tag;
import org.junit.jupiter.api.Test;

/** Analysis-only probe: what each hand-maintained notification migration ladder actually builds. */
@Tag("jpa-contract")
class AnalysisNotificationLadderProbe {

  private static final List<String> NOTIFICATION =
      List.of(
          "V1__notification_platform_core.sql",
          "V2__notification_platform_contact_template_policy.sql",
          "V3__notification_platform_inbox_admin.sql",
          "V4__notification_platform_alignment_and_activation.sql",
          "V5__notification_recipient_expiry.sql",
          "V6__notification_projection_facts.sql",
          "V7__notification_collapse.sql",
          "V8__notification_admin_claim.sql",
          "V9__notification_evidence_certainty.sql",
          "V10__variables_payload_envelope_guard.sql");

  @Test
  void ladderColumnCoverage() throws Exception {
    Set<String> full = null;
    for (int depth : new int[] {6, 8, 9, 10}) {
      Set<String> columns = columnsAfter(depth);
      if (depth == 10) {
        full = columns;
      }
      System.out.println("ladder.notificationVersions=" + depth + " columns=" + columns.size());
    }
    for (int depth : new int[] {6, 8, 9}) {
      Set<String> columns = columnsAfter(depth);
      TreeSet<String> missing = new TreeSet<>(full);
      missing.removeAll(columns);
      System.out.println(
          "ladder.notificationVersions=" + depth + " missingVersusV10=" + missing.size());
      System.out.println("ladder." + depth + ".missing=" + missing);
    }
  }

  private static Set<String> columnsAfter(int notificationDepth) throws Exception {
    try (JpaPlatformContractSupport server = JpaPlatformContractSupport.start()) {
      List<String> statements = new ArrayList<>();
      statements.add(read("jpa/core", "V1__initialize_or_adopt.sql"));
      statements.add(read("jpa/core", "V2__widen_capability_schema_stream.sql"));
      for (int index = 0; index < notificationDepth; index++) {
        statements.add(read("jpa/notification-platform", NOTIFICATION.get(index)));
      }
      try (Connection connection = server.connection();
          Statement statement = connection.createStatement()) {
        for (String sql : statements) {
          statement.execute(sql);
        }
      }
      return notificationColumns(server);
    }
  }

  private static Set<String> notificationColumns(JpaPlatformContractSupport server)
      throws SQLException {
    TreeSet<String> columns = new TreeSet<>();
    try (Connection connection = server.connection();
        Statement statement = connection.createStatement();
        ResultSet rows =
            statement.executeQuery(
                "select table_name || '.' || column_name from information_schema.columns"
                    + " where table_schema = 'public' and table_name like 'notification%'"
                    + " order by 1")) {
      while (rows.next()) {
        columns.add(rows.getString(1));
      }
    }
    return columns;
  }

  private static String read(String stream, String fileName) throws IOException {
    try (InputStream resource =
        AnalysisNotificationLadderProbe.class
            .getClassLoader()
            .getResourceAsStream("db/migration/" + stream + "/" + fileName)) {
      if (resource == null) {
        throw new IOException("missing " + fileName);
      }
      return new String(resource.readAllBytes(), StandardCharsets.UTF_8);
    }
  }
}