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package io.airlift.http.server;

import com.google.common.collect.ImmutableList;
import com.google.inject.Binder;
import com.google.inject.Key;
import org.eclipse.jetty.util.VirtualThreads;

import java.util.ArrayList;
import java.util.List;

import static com.google.inject.multibindings.Multibinder.newSetBinder;
import static com.google.inject.multibindings.OptionalBinder.newOptionalBinder;
import static java.util.Objects.requireNonNull;

public class HttpServerBinder
{
    private final Binder binder;

    private HttpServerBinder(Binder binder)
    {
        this.binder = requireNonNull(binder, "binder is null").skipSources(getClass());
    }

    public static HttpServerBinder httpServerBinder(Binder binder)
    {
        return new HttpServerBinder(binder);
    }

    public HttpServerBinder enableVirtualThreads()
    {
        if (!VirtualThreads.areSupported()) {
            binder.addError("Virtual threads are not supported");
        }
        newOptionalBinder(binder, Key.get(Boolean.class, EnableVirtualThreads.class)).setBinding().toInstance(true);
        return this;
    }

    public HttpServerBinder enableCaseSensitiveHeaderCache()
    {
        newOptionalBinder(binder, Key.get(Boolean.class, EnableCaseSensitiveHeaderCache.class)).setBinding().toInstance(true);
        return this;
    }

    public HttpServerBinder enableLegacyUriCompliance()
    {
        newOptionalBinder(binder, Key.get(Boolean.class, EnableLegacyUriCompliance.class)).setBinding().toInstance(true);
        return this;
    }

    public HttpResourceBinding bindResource(String baseUri, String classPathResourceBase)
    {
        HttpResourceBinding httpResourceBinding = new HttpResourceBinding(baseUri, classPathResourceBase);
        newSetBinder(binder, HttpResourceBinding.class).addBinding().toInstance(httpResourceBinding);
        return httpResourceBinding;
    }

    public static class HttpResourceBinding
    {
        private final String baseUri;
        private final String classPathResourceBase;
        private final List welcomeFiles = new ArrayList<>();

        public HttpResourceBinding(String baseUri, String classPathResourceBase)
        {
            this.baseUri = baseUri;
            this.classPathResourceBase = classPathResourceBase;
        }

        public String getBaseUri()
        {
            return baseUri;
        }

        public String getClassPathResourceBase()
        {
            return classPathResourceBase;
        }

        public List getWelcomeFiles()
        {
            return ImmutableList.copyOf(welcomeFiles);
        }

        public HttpResourceBinding withWelcomeFile(String welcomeFile)
        {
            welcomeFiles.add(welcomeFile);
            return this;
        }
    }
}