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package org.apache.james.jmap.http;

import java.util.stream.Stream;

import javax.inject.Inject;

import org.apache.james.core.Username;
import org.apache.james.jmap.draft.exceptions.MailboxSessionCreationException;
import org.apache.james.jwt.JwtTokenVerifier;
import org.apache.james.mailbox.MailboxManager;
import org.apache.james.mailbox.MailboxSession;
import org.apache.james.user.api.UsersRepository;
import org.apache.james.user.api.UsersRepositoryException;

import com.google.common.annotations.VisibleForTesting;

import reactor.core.publisher.Mono;
import reactor.netty.http.server.HttpServerRequest;

public class JWTAuthenticationStrategy implements AuthenticationStrategy {

    @VisibleForTesting static final String AUTHORIZATION_HEADER_PREFIX = "Bearer ";
    private final JwtTokenVerifier tokenManager;
    private final MailboxManager mailboxManager;
    private final UsersRepository usersRepository;

    @Inject
    @VisibleForTesting
    JWTAuthenticationStrategy(JwtTokenVerifier tokenManager, MailboxManager mailboxManager, UsersRepository usersRepository) {
        this.tokenManager = tokenManager;
        this.mailboxManager = mailboxManager;
        this.usersRepository = usersRepository;
    }

    @Override
    public Mono createMailboxSession(HttpServerRequest httpRequest) throws MailboxSessionCreationException {
        Stream userLoginStream = extractTokensFromAuthHeaders(authHeaders(httpRequest))
            .filter(tokenManager::verify)
            .map(tokenManager::extractLogin)
            .map(Username::of)
            .peek(username -> {
                try {
                    usersRepository.assertValid(username);
                } catch (UsersRepositoryException e) {
                    throw new MailboxSessionCreationException(e);
                }
            });

        Stream mailboxSessionStream = userLoginStream
                .map(mailboxManager::createSystemSession);

        return Mono.justOrEmpty(mailboxSessionStream.findFirst());
    }

    private Stream extractTokensFromAuthHeaders(Stream authHeaders) {
        return authHeaders
                .filter(h -> h.startsWith(AUTHORIZATION_HEADER_PREFIX))
                .map(h -> h.substring(AUTHORIZATION_HEADER_PREFIX.length()));
    }
}