package org.asamk.signal.commands;

import net.sourceforge.argparse4j.inf.Namespace;
import net.sourceforge.argparse4j.inf.Subparser;

import org.asamk.Signal;
import org.asamk.signal.PlainTextWriterImpl;
import org.asamk.signal.commands.exceptions.CommandException;
import org.asamk.signal.commands.exceptions.UnexpectedErrorException;
import org.asamk.signal.commands.exceptions.UserErrorException;
import org.asamk.signal.manager.AttachmentInvalidException;
import org.asamk.signal.manager.Manager;
import org.asamk.signal.manager.groups.GroupId;
import org.asamk.signal.manager.groups.GroupIdFormatException;
import org.asamk.signal.manager.groups.GroupNotFoundException;
import org.asamk.signal.manager.groups.NotAGroupMemberException;
import org.asamk.signal.util.ErrorUtils;
import org.asamk.signal.util.Util;
import org.freedesktop.dbus.exceptions.DBusExecutionException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.whispersystems.signalservice.api.util.InvalidNumberException;

import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Base64;
import java.util.List;

public class UpdateGroupCommand implements DbusCommand, LocalCommand {

    private final static Logger logger = LoggerFactory.getLogger(UpdateGroupCommand.class);

    @Override
    public void attachToSubparser(final Subparser subparser) {
        subparser.addArgument("-g", "--group").help("Specify the recipient group ID.");
        subparser.addArgument("-n", "--name").help("Specify the new group name.");
        subparser.addArgument("-d", "--description").help("Specify the new group description.");
        subparser.addArgument("-a", "--avatar").help("Specify a new group avatar image file");
        subparser.addArgument("-m", "--member").nargs("*").help("Specify one or more members to add to the group");
    }

    @Override
    public void handleCommand(final Namespace ns, final Manager m) throws CommandException {
        final var writer = new PlainTextWriterImpl(System.out);
        GroupId groupId = null;
        final var groupIdString = ns.getString("group");
        if (groupIdString != null) {
            try {
                groupId = Util.decodeGroupId(groupIdString);
            } catch (GroupIdFormatException e) {
                throw new UserErrorException("Invalid group id:" + e.getMessage());
            }
        }

        var groupName = ns.getString("name");

        var groupDescription = ns.getString("description");

        List<String> groupMembers = ns.getList("member");

        var groupAvatar = ns.getString("avatar");

        try {
            if (groupId == null) {
                var results = m.createGroup(groupName,
                        groupMembers,
                        groupAvatar == null ? null : new File(groupAvatar));
                ErrorUtils.handleTimestampAndSendMessageResults(writer, 0, results.second());
                final var newGroupId = results.first();
                writer.println("Created new group: \"{}\"", newGroupId.toBase64());
            } else {
                var results = m.updateGroup(groupId,
                        groupName,
                        groupDescription,
                        groupMembers,
                        groupAvatar == null ? null : new File(groupAvatar));
                ErrorUtils.handleTimestampAndSendMessageResults(writer, results.first(), results.second());
            }
        } catch (AttachmentInvalidException e) {
            throw new UserErrorException("Failed to add avatar attachment for group\": " + e.getMessage());
        } catch (GroupNotFoundException e) {
            logger.warn("Unknown group id: {}", groupIdString);
        } catch (NotAGroupMemberException e) {
            logger.warn("You're not a group member");
        } catch (InvalidNumberException e) {
            throw new UserErrorException("Failed to parse member number: " + e.getMessage());
        } catch (IOException e) {
            throw new UnexpectedErrorException("Failed to send message: " + e.getMessage());
        }
    }

    @Override
    public void handleCommand(final Namespace ns, final Signal signal) throws CommandException {
        final var writer = new PlainTextWriterImpl(System.out);
        byte[] groupId = null;
        if (ns.getString("group") != null) {
            try {
                groupId = Util.decodeGroupId(ns.getString("group")).serialize();
            } catch (GroupIdFormatException e) {
                throw new UserErrorException("Invalid group id:" + e.getMessage());
            }
        }
        if (groupId == null) {
            groupId = new byte[0];
        }

        var groupName = ns.getString("name");
        if (groupName == null) {
            groupName = "";
        }

        List<String> groupMembers = ns.getList("member");
        if (groupMembers == null) {
            groupMembers = new ArrayList<>();
        }

        var groupAvatar = ns.getString("avatar");
        if (groupAvatar == null) {
            groupAvatar = "";
        }

        try {
            var newGroupId = signal.updateGroup(groupId, groupName, groupMembers, groupAvatar);
            if (groupId.length != newGroupId.length) {
                writer.println("Created new group: \"{}\"", Base64.getEncoder().encodeToString(newGroupId));
            }
        } catch (Signal.Error.AttachmentInvalid e) {
            throw new UserErrorException("Failed to add avatar attachment for group\": " + e.getMessage());
        } catch (DBusExecutionException e) {
            throw new UnexpectedErrorException("Failed to send message: " + e.getMessage());
        }
    }
}