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/*
 * Copyright 2010 Proofpoint, Inc.
 *
 * 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
 *
 *     http://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 com.facebook.airlift.http.client;

import com.facebook.airlift.configuration.ConfigDefaults;
import com.google.common.annotations.Beta;
import com.google.inject.Binder;
import com.google.inject.Scopes;
import com.google.inject.binder.LinkedBindingBuilder;
import com.google.inject.multibindings.Multibinder;

import java.lang.annotation.Annotation;
import java.util.Collection;

import static com.google.inject.multibindings.Multibinder.newSetBinder;

@Beta
public class HttpClientBinder
{
    private final Binder binder;
    private final Multibinder globalFilterBinder;

    private HttpClientBinder(Binder binder)
    {
        this.binder = binder.skipSources(getClass());
        this.globalFilterBinder = newSetBinder(binder, HttpRequestFilter.class, GlobalFilter.class);
    }

    public static HttpClientBinder httpClientBinder(Binder binder)
    {
        return new HttpClientBinder(binder);
    }

    public HttpClientBindingBuilder bindHttpClient(String name, Class annotation)
    {
        HttpClientModule module = new HttpClientModule(name, annotation);
        binder.install(module);
        return new HttpClientBindingBuilder(module, newSetBinder(binder, HttpRequestFilter.class, annotation));
    }

    public LinkedBindingBuilder addGlobalFilterBinding()
    {
        return globalFilterBinder.addBinding();
    }

    public HttpClientBinder bindGlobalFilter(Class filterClass)
    {
        globalFilterBinder.addBinding().to(filterClass).in(Scopes.SINGLETON);
        return this;
    }

    public HttpClientBinder bindGlobalFilter(HttpRequestFilter filter)
    {
        globalFilterBinder.addBinding().toInstance(filter);
        return this;
    }

    public static class HttpClientBindingBuilder
    {
        private final HttpClientModule module;
        private final Multibinder multibinder;

        public HttpClientBindingBuilder(HttpClientModule module, Multibinder multibinder)
        {
            this.module = module;
            this.multibinder = multibinder;
        }

        public HttpClientBindingBuilder withAlias(Class alias)
        {
            module.addAlias(alias);
            return this;
        }

        public HttpClientBindingBuilder withAliases(Collection> aliases)
        {
            for (Class annotation : aliases) {
                module.addAlias(annotation);
            }
            return this;
        }

        public HttpClientBindingBuilder withConfigDefaults(ConfigDefaults configDefaults)
        {
            module.withConfigDefaults(configDefaults);
            return this;
        }

        public LinkedBindingBuilder addFilterBinding()
        {
            return multibinder.addBinding();
        }

        public HttpClientBindingBuilder withFilter(Class filterClass)
        {
            multibinder.addBinding().to(filterClass);
            return this;
        }

        public HttpClientBindingBuilder withTracing()
        {
            return withFilter(TraceTokenRequestFilter.class);
        }
    }
}