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package org.apache.james.imap.decode.parser;

import java.util.Optional;
import java.util.function.Function;

import javax.inject.Inject;

import org.apache.james.imap.api.ImapConstants;
import org.apache.james.imap.api.ImapMessage;
import org.apache.james.imap.api.Tag;
import org.apache.james.imap.api.display.HumanReadableText;
import org.apache.james.imap.api.message.response.StatusResponseFactory;
import org.apache.james.imap.api.process.ImapSession;
import org.apache.james.imap.decode.DecodingException;
import org.apache.james.imap.decode.ImapRequestLineReader;
import org.apache.james.imap.decode.base.AbstractImapCommandParser;
import org.apache.james.imap.message.request.SetMetadataRequest;
import org.apache.james.mailbox.model.MailboxAnnotation;
import org.apache.james.mailbox.model.MailboxAnnotationKey;

import com.google.common.collect.ImmutableList;

public class SetAnnotationCommandParser extends AbstractImapCommandParser {

    @Inject
    public SetAnnotationCommandParser(StatusResponseFactory statusResponseFactory) {
        super(ImapConstants.SETMETADATA_COMMAND, statusResponseFactory);
    }

    @Override
    protected ImapMessage decode(ImapRequestLineReader request, Tag tag, ImapSession session)
            throws DecodingException {
        String mailboxName = request.mailbox();
        ImmutableList.Builder listMailboxAnnotations = ImmutableList.builder();

        if (request.nextWordChar() == '(') {
            request.consumeChar('(');

            do {
                listMailboxAnnotations.add(readNextAnnotation(request));
            } while (request.nextWordChar() != ')');

            request.consumeChar(')');
        }
        request.eol();

        return new SetMetadataRequest(tag, mailboxName, listMailboxAnnotations.build());
    }

    private MailboxAnnotation readNextAnnotation(ImapRequestLineReader request) throws DecodingException {
        try {
            String key = request.atom();
            String value = request.nstring();

            return Optional.ofNullable(value)
                .map(transforMailboxAnnotation(key))
                .orElseGet(() -> MailboxAnnotation.nil(createAnnotationKey(key)));
        } catch (IllegalArgumentException e) {
            throw new DecodingException(HumanReadableText.ILLEGAL_ARGUMENTS, "The key is not valid: " + e.getMessage());
        }
    }

    private Function transforMailboxAnnotation(final String key) {
        return value -> MailboxAnnotation.newInstance(createAnnotationKey(key), value);
    }

    private MailboxAnnotationKey createAnnotationKey(String key) {
        return new MailboxAnnotationKey(key);
    }

}