/*
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
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 *
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 * -----------------------------------------------------------------------------
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 * commercial database integrations.
 *
 * For more information, please visit: https://www.jooq.org/legal/licensing
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package org.jooq.tools.jdbc;

import java.sql.Connection;

import org.jooq.ConnectionProvider;

/**
 * A mock connection provider.
 * <p>
 * This {@link ConnectionProvider} wraps a delegate
 * <code>ConnectionProvider</code> and wraps all acquired {@link Connection}
 * references in {@link MockConnection}.
 * <p>
 * <strong>Disclaimer: The general idea of mocking a JDBC connection with this
 * jOOQ API is to provide quick workarounds, injection points, etc. using a very
 * simple JDBC abstraction. It is NOT RECOMMENDED to emulate an entire database
 * (including complex state transitions, transactions, locking, etc.) using this
 * mock API. Once you have this requirement, please consider using an actual
 * database instead for integration testing (e.g. using
 * <a href="https://www.testcontainers.org">https://www.testcontainers.org</a>),
 * rather than implementing your test database inside of a
 * MockDataProvider.</strong>
 *
 * @author Lukas Eder
 */
public class MockConnectionProvider implements ConnectionProvider {

    private final ConnectionProvider delegate;
    private final MockDataProvider   provider;

    public MockConnectionProvider(ConnectionProvider delegate, MockDataProvider provider) {
        this.delegate = delegate;
        this.provider = provider;
    }

    @Override
    public final Connection acquire() {
        return new MockConnectionWrapper(delegate.acquire());
    }

    @Override
    public final void release(Connection connection) {
        if (connection instanceof MockConnectionWrapper w)
            delegate.release(w.connection);
        else
            throw new IllegalArgumentException("Argument connection must be a MockConnectionWrapper");
    }

    private class MockConnectionWrapper extends MockConnection {
        final Connection connection;

        public MockConnectionWrapper(Connection connection) {
            super(provider);
            this.connection = connection;
        }
    }
}
