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/**
 * Copyright 2022 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package io.micrometer.tracing.brave.bridge;

import io.micrometer.observation.transport.Kind;
import io.micrometer.tracing.http.HttpServerRequest;

import java.util.Collection;
import java.util.Collections;

/**
 * Brave implementation of a {@link HttpServerRequest}.
 *
 * @author Marcin Grzejszczak
 * @since 1.0.0
 * @deprecated scheduled for removal in 1.4.0
 */
@Deprecated
class BraveHttpServerRequest implements HttpServerRequest {

    private static final boolean JAVAX_SERVLET_ON_THE_CLASSPATH = isClassPresent("javax.servlet.ServletRequest");

    private static final boolean JAKARTA_SERVLET_ON_THE_CLASSPATH = isClassPresent("jakarta.servlet.ServletRequest");

    final brave.http.HttpServerRequest delegate;

    BraveHttpServerRequest(brave.http.HttpServerRequest delegate) {
        this.delegate = delegate;
    }

    private static boolean isClassPresent(String clazz) {
        try {
            Class.forName(clazz);
            return true;
        }
        catch (ClassNotFoundException e) {
            return false;
        }
    }

    static brave.http.HttpServerRequest toBrave(HttpServerRequest request) {
        if (request == null) {
            return null;
        }
        if (request instanceof BraveHttpServerRequest) {
            return ((BraveHttpServerRequest) request).delegate;
        }
        return new brave.http.HttpServerRequest() {

            @Override
            public Object unwrap() {
                return request.unwrap();
            }

            @Override
            public String method() {
                return request.method();
            }

            @Override
            public String path() {
                return request.path();
            }

            @Override
            public String url() {
                return request.url();
            }

            @Override
            public String header(String name) {
                return request.header(name);
            }

            @Override
            public boolean parseClientIpAndPort(brave.Span span) {
                boolean clientIpAndPortParsed = super.parseClientIpAndPort(span);
                if (clientIpAndPortParsed) {
                    return true;
                }
                return resolveFromInetAddress(span);
            }

            private boolean resolveFromInetAddress(brave.Span span) {
                Object delegate = request.unwrap();
                if (JAVAX_SERVLET_ON_THE_CLASSPATH && delegate instanceof javax.servlet.ServletRequest) {
                    javax.servlet.ServletRequest servletRequest = (javax.servlet.ServletRequest) delegate;
                    String addr = servletRequest.getRemoteAddr();
                    if (addr == null) {
                        return false;
                    }
                    return span.remoteIpAndPort(addr, servletRequest.getRemotePort());
                }
                else if (JAKARTA_SERVLET_ON_THE_CLASSPATH && delegate instanceof jakarta.servlet.ServletRequest) {
                    jakarta.servlet.ServletRequest servletRequest = (jakarta.servlet.ServletRequest) delegate;
                    String addr = servletRequest.getRemoteAddr();
                    if (addr == null) {
                        return false;
                    }
                    return span.remoteIpAndPort(addr, servletRequest.getRemotePort());
                }
                return false;
            }

        };
    }

    @Override
    public String method() {
        return this.delegate.method();
    }

    @Override
    public String route() {
        return this.delegate.route();
    }

    @Override
    public Object unwrap() {
        return this.delegate.unwrap();
    }

    @Override
    public Collection headerNames() {
        // this is unused by Brave
        return Collections.emptyList();
    }

    @Override
    public Kind kind() {
        return Kind.valueOf(this.delegate.spanKind().name());
    }

    @Override
    public String path() {
        return this.delegate.path();
    }

    @Override
    public String url() {
        return this.delegate.url();
    }

    @Override
    public String header(String name) {
        return this.delegate.header(name);
    }

}