package io.gitlab.jfronny.inceptum.cli;

import java.util.*;

public abstract class Command {
    private final String help;
    private final String usage;
    private final List<String> aliases;
    private final Collection<Command> subCommands;

    public Command(String help, String usage, String... aliases) {
        this(help, usage, Arrays.asList(aliases), List.of());
    }

    public Command(String help, String usage, List<String> aliases, List<Command> subCommands) {
        this.help = help;
        this.usage = usage;
        this.aliases = List.copyOf(aliases);
        this.subCommands = List.copyOf(subCommands);
    }

    public boolean isAlias(String text) {
        return aliases.contains(text.replaceAll("^[-/]*", "").toLowerCase(Locale.ROOT));
    }

    public String getName() {
        return aliases.get(0);
    }

    public boolean enableLog() {
        return false;
    }

    protected abstract void invoke(CommandArgs args) throws Exception;

    public CommandResolution resolve(CommandArgs args) {
        if (args.length != 0) {
            for (Command command : subCommands) {
                if (command.isAlias(args.get(0))) {
                    CommandResolution resolution = command.resolve(args.subArgs());
                    if (!aliases.isEmpty()) resolution.resolvePath().add(0, aliases.get(0));
                    return resolution;
                }
            }
        }
        return new CommandResolution(this, args, aliases.isEmpty()
                ? new ArrayList<>()
                : new ArrayList<>(List.of(aliases.get(0))));
    }

    public void buildHelp(HelpBuilder builder) {
        builder.writeCommand(aliases, help, usage);
        for (Command command : subCommands) {
            command.buildHelp(aliases.isEmpty() ? builder : builder.beginSubcommand(aliases.get(0)));
        }
    }
}