package io.trygvis.container.compiler;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.StringReader;

import static java.lang.Character.toLowerCase;
import static java.lang.Character.toUpperCase;

public class Utils {
    public static String toFieldName(String s) {
        if (s.length() < 1) {
            return s.toLowerCase();
        }

        if (s.startsWith("set")) {
            s = s.substring(3, s.length());
        } else if (s.startsWith("get")) {
            s = s.substring(3, s.length());
        }

        char[] chars = s.toCharArray();

        boolean toUpper = false;

        int j = 0;
        for (int i = 0; i < chars.length; i++) {
            char c = chars[i];
            if (c == '_') {
                toUpper = true;
            } else {
                if (j == 0) {
                    chars[j++] = toLowerCase(c);
                } else {
                    chars[j++] = toUpper ? toUpperCase(c) : c;
                }
                toUpper = false;
            }
        }
        return new String(chars, 0, j);
    }

    public static String toSetterName(String s) {
        s = toFieldName(s);
        return "set" + toUpperCase(s.charAt(0)) + s.substring(1, s.length());
    }

    public static String toGetterName(String s) {
        s = toFieldName(s);
        return "get" + toUpperCase(s.charAt(0)) + s.substring(1, s.length());
    }

    public static String toJavaString(String s) {
        try {
            BufferedReader reader = new BufferedReader(new StringReader(s));
            String line = reader.readLine();
            StringBuilder buffer = new StringBuilder();
            while (line != null) {
                buffer.append('"');
                buffer.append(line.replace("\"", "\\\""));
                buffer.append('"');
                line = reader.readLine();
                if(line != null) {
                    buffer.append(" +\n");
                }
            }

            return buffer.toString();
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }
}