import { Context } from "fresh";
import { db } from "../../../db/db.ts";
import type { State } from "../../../utils.ts";

/**
 * Debug endpoint to verify database schema
 * Returns list of tables that exist in the database
 */
export const handler = async (
  _req: Request,
  _ctx: Context<State>,
): Promise<Response> => {
  try {
    // Query PostgreSQL information_schema to get all tables
    const query = `
      SELECT table_name
      FROM information_schema.tables
      WHERE table_schema = 'memory'
        OR table_schema = 'checkpoints'
        OR table_schema = 'public'
      ORDER BY table_schema, table_name
    `;

    const result = await db.execute(query);

    // Expected tables based on schema.ts
    const expectedTables = [
      "users",
      "roles",
      "user_roles",
      "state_keys",
      "user_tokens",
      "web_tokens",
      "obligations",
      "incomes",
      "financial_balances",
      "properties",
      "rent_schedules",
      "leases",
      "payment_methods",
      "property_media",
      "lease_documents",
      "tenant_applications",
      "tenant_invites",
      "payment_transactions",
      "reminders",
      "messages",
      "maintenance_requests",
      "user_pins",
      "session_configs",
    ];

    // Extract table names from query result
    const existingTables = result.rows.map((row: Record<string, unknown>) =>
      String(row["table_name"])
    );

    // Find missing tables
    const missingTables = expectedTables.filter(
      (table) => !existingTables.includes(table),
    );

    return new Response(
      JSON.stringify({
        status: "success",
        existing_tables: existingTables,
        expected_tables: expectedTables,
        missing_tables: missingTables,
        all_tables_present: missingTables.length === 0,
        total_existing: existingTables.length,
        total_expected: expectedTables.length,
      }),
      {
        status: 200,
        headers: { "Content-Type": "application/json" },
      },
    );
  } catch (error) {
    console.error("Error checking database schema:", error);
    return new Response(
      JSON.stringify({
        status: "error",
        message: error instanceof Error ? error.message : "Unknown error",
      }),
      {
        status: 500,
        headers: { "Content-Type": "application/json" },
      },
    );
  }
};