package game.command;

import java.util.List;

import com.google.common.collect.Lists;

public abstract class ArgumentParser {
	public static String[][] splitString(String str) {
//    	if(str.isEmpty()) {
//			return new String[0];
//		}
		int pos;
		int last = 0;
		boolean space = true;
		boolean quote = false;
		boolean escape = false;
		char c;
		String arg = "";
		List<String> args = Lists.<String>newArrayList();
		List<String[]> cmds = Lists.<String[]>newArrayList();
		for(pos = 0; pos < str.length(); pos++) {
			c = str.charAt(pos);
			if(escape) {
				escape = false;
				switch(c) {
				case '\\':
				case ' ':
				case '"':
				case ';':
					arg += c;
					break;
				default:
					throw new ScriptException("Unbekannte Sequenz bei Zeichen %d: '\\%c'", pos + 1, c);
				}
			}
			else if(c == '\\') {
				space = false;
				escape = true;
			}
			else if(c == '"') {
				space = false;
				quote = !quote;
				last = pos;
			}
			else if(c == ' ' && !quote) {
				if(!space) {
					args.add(arg);
					arg = "";
				}
				space = true;
			}
			else if(c == ';' && !quote) {
				if(!space) {
					args.add(arg);
					arg = "";
				}
				if(!args.isEmpty()) {
					cmds.add(args.toArray(new String[args.size()]));
					args.clear();
				}
			}
			else {
				space = false;
				arg += c;
			}
		}
		if(escape)
			throw new ScriptException("Unvollständige Sequenz bei Zeichen %d", pos + 1);
		if(quote)
			throw new ScriptException("Nicht geschlossenes Anführungszeichen bei %d", last + 1);
		if(!space)
			args.add(arg);
		if(!args.isEmpty()) {
			cmds.add(args.toArray(new String[args.size()]));
			args.clear();
		}
		return cmds.toArray(new String[cmds.size()][]);
	}
	
	private final String name;
	
	public ArgumentParser(String name) {
		this.name = name;
	}

	public abstract Object parse(ScriptEnvironment env, String input);
	public abstract Object getDefault(ScriptEnvironment env);
	public abstract String[] getCompletions(ScriptEnvironment env);
	public abstract Class<?> getTypeClass();
	
	public final String getName() {
		return this.name;
	}
	
	public final String toString() {
		return this.name;
	}
}