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package org.apache.james.imap.main;

import java.util.List;

import org.apache.james.core.Username;
import org.apache.james.imap.api.process.ImapSession;
import org.apache.james.mailbox.model.MailboxConstants;
import org.apache.james.mailbox.model.MailboxPath;

import com.google.common.base.Joiner;
import com.google.common.base.Preconditions;
import com.google.common.base.Splitter;
import com.google.common.base.Strings;
import com.google.common.collect.Iterables;

public class PathConverter {

    private static final int NAMESPACE = 0;

    public static PathConverter forSession(ImapSession session) {
        return new PathConverter(session);
    }

    private final ImapSession session;

    private PathConverter(ImapSession session) {
        this.session = session;
    }

    public MailboxPath buildFullPath(String mailboxName) {
        if (Strings.isNullOrEmpty(mailboxName)) {
            return buildRelativePath("");
        }
        if (isAbsolute(mailboxName)) {
            return buildAbsolutePath(mailboxName);
        } else {
            return buildRelativePath(mailboxName);
        }
    }

    private boolean isAbsolute(String mailboxName) {
        Preconditions.checkArgument(!Strings.isNullOrEmpty(mailboxName));
        return mailboxName.charAt(0) == MailboxConstants.NAMESPACE_PREFIX_CHAR;
    }

    private MailboxPath buildRelativePath(String mailboxName) {
        return buildMailboxPath(MailboxConstants.USER_NAMESPACE, session.getUserName(), mailboxName);
    }

    private MailboxPath buildAbsolutePath(String absolutePath) {
        char pathDelimiter = session.getMailboxSession().getPathDelimiter();
        List mailboxPathParts = Splitter.on(pathDelimiter).splitToList(absolutePath);
        String namespace = mailboxPathParts.get(NAMESPACE);
        String mailboxName = Joiner.on(pathDelimiter).join(Iterables.skip(mailboxPathParts, 1));
        return buildMailboxPath(namespace, retrieveUserName(namespace), mailboxName);
    }

    private Username retrieveUserName(String namespace) {
        if (namespace.equals(MailboxConstants.USER_NAMESPACE)) {
            return session.getUserName();
        }
        throw new DeniedAccessOnSharedMailboxException();
    }

    private MailboxPath buildMailboxPath(String namespace, Username user, String mailboxName) {
        if (!namespace.equals(MailboxConstants.USER_NAMESPACE)) {
            throw new DeniedAccessOnSharedMailboxException();
        }
        return new MailboxPath(namespace, user, sanitizeMailboxName(mailboxName));
    }

    private String sanitizeMailboxName(String mailboxName) {
        // use uppercase for INBOX
        // See IMAP-349
        if (mailboxName.equalsIgnoreCase(MailboxConstants.INBOX)) {
            return MailboxConstants.INBOX;
        }
        return mailboxName;
    }

}