import java.util.LinkedHashMap;
import java.util.Map;
import java.util.Scanner;

/*
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/**
 *
 * @author jerrykwok
 */
public class CommandHandler {

    private LinkedHashMap<String, CommandFactory> mapCmds;
    private StateManager state;

    public CommandHandler(StateManager state) {
        this.mapCmds = new LinkedHashMap<String, CommandFactory>();
        this.state = state;
    }

    public void regCommand(String key, CommandFactory cmdFactory) {
        mapCmds.put(key, cmdFactory);
    }

    public void printCommandList() {
        System.out.print("Please enter command: [");
        System.out.print(String.join(" | ", mapCmds.keySet()));
        System.out.println("]");
        for (Map.Entry<String, CommandFactory> mapCmd : mapCmds.entrySet()) {
            System.out.print(mapCmd.getKey() + " = " + mapCmd.getValue().getCommandName());
        }
        System.out.println("\n");
    }

    public boolean run(String cmd) {
        CommandFactory commandFactory = mapCmds.get(cmd);
        if (commandFactory != null) {
            Command command = commandFactory.createCommand();
            boolean result = command.execute();
            if (result) {
                switch (cmd) {
                    case "a":
                    case "c":
                    case "s":
                        state.getUndoList().add(command);
                        state.getRedoList().clear();
                }
            }
            return true;
        }

        return false;
    }

}