package org.bukkit.command.defaults;

import java.util.ArrayList;
import java.util.Arrays;
import org.bukkit.ChatColor;
import org.bukkit.Bukkit;
import org.bukkit.command.Command;
import org.bukkit.command.CommandSender;
import org.bukkit.plugin.Plugin;
import org.bukkit.plugin.PluginDescriptionFile;

public class VersionCommand extends Command {
    public VersionCommand(String name) {
        super(name);
        
        this.description = "Gets the version of this server including any plugins in use";
        this.usageMessage = "/version [plugin name]";
        this.setPermission("bukkit.command.version");
        this.setAliases(Arrays.asList("ver", "about"));
    }

    @Override
    public boolean execute(CommandSender sender, String currentAlias, String[] args) {
        if (!testPermission(sender)) return true;
        
        if (args.length == 0) {
            sender.sendMessage("This server is running " + ChatColor.GREEN + Bukkit.getName() + ChatColor.WHITE + " version " + ChatColor.GREEN + Bukkit.getVersion());
            sender.sendMessage("This server is also sporting some funky dev build of Bukkit!");
        } else {
            StringBuilder name = new StringBuilder();

            for (String arg : args) {
                if (name.length() > 0) {
                    name.append(' ');
                }
                
                name.append(arg);
            }

            Plugin plugin = Bukkit.getPluginManager().getPlugin(name.toString());

            if (plugin != null) {
                PluginDescriptionFile desc = plugin.getDescription();
                sender.sendMessage(ChatColor.GREEN + desc.getName() + ChatColor.WHITE + " version " + ChatColor.GREEN + desc.getVersion());

                if (desc.getDescription() != null) {
                    sender.sendMessage(desc.getDescription());
                }

                if (desc.getWebsite() != null) {
                    sender.sendMessage("Website: " + ChatColor.GREEN + desc.getWebsite());
                }

                if (!desc.getAuthors().isEmpty()) {
                    if (desc.getAuthors().size() == 1) {
                        sender.sendMessage("Author: " + getAuthors(desc));
                    } else {
                        sender.sendMessage("Authors: " + getAuthors(desc));
                    }
                }
            } else {
                sender.sendMessage("This server is not running any plugin by that name.");
                sender.sendMessage("Use /plugins to get a list of plugins.");
            }
        }
        return true;
    }

    private String getAuthors(final PluginDescriptionFile desc) {
        StringBuilder result = new StringBuilder();
        ArrayList<String> authors = desc.getAuthors();

        for (int i = 0; i < authors.size(); i++) {
            if (result.length() > 0) {
                result.append(ChatColor.WHITE);

                if (i < authors.size() - 1) {
                    result.append(", ");
                } else {
                    result.append(" and ");
                }
            }

            result.append(ChatColor.GREEN);
            result.append(authors.get(i));
        }
        
        return result.toString();
    }
}