package io.dico.dicore.command;

import io.dico.dicore.command.predef.DefaultGroupCommand;
import io.dico.dicore.command.predef.HelpCommand;

import java.util.*;

public class ChildCommandAddress extends ModifiableCommandAddress {
    ModifiableCommandAddress parent;
    final List<String> namesModifiable = new ArrayList<>(4);
    List<String> names = namesModifiable;
    Command command;
    boolean isCommandTrailing;

    public ChildCommandAddress() {
    }

    public ChildCommandAddress(Command command) {
        this.command = command;
    }

    public ChildCommandAddress(Command command, String name, String... aliases) {
        this(command);
        addNameAndAliases(name, aliases);
    }

    public static ChildCommandAddress newPlaceHolderCommand(String name, String... aliases) {
        ChildCommandAddress rv = new ChildCommandAddress();
        rv.setupAsPlaceholder(name, aliases);
        return rv;
    }

    public void setupAsPlaceholder(String name, String... aliases) {
        if (!hasCommand()) {
            setCommand(DefaultGroupCommand.getInstance());
        }

        addNameAndAliases(name, aliases);
        HelpCommand.registerAsChild(this);
    }

    @Override
    public boolean isRoot() {
        return false;
    }

    @Override
    public ModifiableCommandAddress getParent() {
        return parent;
    }

    @Override
    public Command getCommand() {
        return command;
    }

    @Override
    public void setCommand(Command command) {
        if (hasUserDeclaredCommand()) {
            throw new IllegalStateException("Command is already set at address \"" + getAddress() + "\"");
        }
        this.command = command;
    }

    @Override
    public List<String> getNames() {
        return names;
    }

    public void addNameAndAliases(String name, String... aliases) {
        names.add(name);
        names.addAll(Arrays.asList(aliases));
    }

    @Override
    public String getMainKey() {
        return namesModifiable.isEmpty() ? null : namesModifiable.get(0);
    }

    @Override
    public String getAddress() {
        ICommandAddress address = this;
        int depth = getDepth();
        String[] keys = new String[depth];
        for (int i = depth - 1; i >= 0; i--) {
            keys[i] = address.getMainKey();
            address = address.getParent();
        }
        return String.join(" ", keys);
    }

    public void finalizeNames() {
        if (names == namesModifiable) {
            names = Collections.unmodifiableList(namesModifiable);
        }
    }

    Iterator<String> modifiableNamesIterator() {
        return namesModifiable.iterator();
    }

    void setParent(ModifiableCommandAddress parent) {
        finalizeNames();
        this.parent = parent;
    }

    @Override
    public boolean isCommandTrailing() {
        return isCommandTrailing;
    }

    @Override
    public void setCommandTrailing(boolean trailing) {
        if (hasChildren()) {
            throw new IllegalStateException("Address already has children, this property can't be modified");
        }
        isCommandTrailing = trailing;
    }

}