package pl.itcrowd.youtrack.api;

import pl.itcrowd.youtrack.api.defaults.Fields;
import pl.itcrowd.youtrack.api.defaults.StateValues;

public class Command {
// ------------------------------ FIELDS ------------------------------

    protected StringBuilder command = new StringBuilder();

// -------------------------- STATIC METHODS --------------------------

    public static Command assigneeCommand(String assignee)
    {
        return new Command().assignee(assignee);
    }

    public static Command stateCommand(String state)
    {
        return new Command().state(state);
    }

    public static Command stateCommand(StateValues state)
    {
        return new Command().state(state);
    }

// --------------------------- CONSTRUCTORS ---------------------------

    protected Command()
    {
    }

// ------------------------ CANONICAL METHODS ------------------------

    @Override
    public String toString()
    {
        return command.toString().trim();
    }

// -------------------------- OTHER METHODS --------------------------

    public Command assignee(String assignee)
    {
        return command(Fields.assignee, assignee);
    }

    public Command state(String state)
    {
        return command(Fields.state, state);
    }

    public Command state(StateValues state)
    {
        if (state.getCommandValue() == null) {
            throw new IllegalArgumentException("Cannot set readonly state: " + state);
        }
        return state(state.getCommandValue());
    }

    protected Command command(Commander commander, String argument)
    {
        this.command.append(" ").append(commander.getCommand()).append(" ").append(argument);
        return this;
    }
}