package com.seconectai.condocontab.util;

import java.time.temporal.TemporalAccessor;
import java.util.Iterator;
import java.util.Map;

public final class Json {
    private Json() {
    }

    public static String write(Object value) {
        return value(value);
    }

    private static String value(Object value) {
        if (value == null) {
            return "null";
        }
        if (value instanceof Number || value instanceof Boolean) {
            return String.valueOf(value);
        }
        if (value instanceof TemporalAccessor) {
            return quote(String.valueOf(value));
        }
        if (value instanceof Map<?, ?> map) {
            StringBuilder json = new StringBuilder("{");
            Iterator<? extends Map.Entry<?, ?>> iterator = map.entrySet().iterator();
            while (iterator.hasNext()) {
                Map.Entry<?, ?> entry = iterator.next();
                json.append(quote(String.valueOf(entry.getKey()))).append(":").append(value(entry.getValue()));
                if (iterator.hasNext()) {
                    json.append(",");
                }
            }
            return json.append("}").toString();
        }
        if (value instanceof Iterable<?> iterable) {
            StringBuilder json = new StringBuilder("[");
            Iterator<?> iterator = iterable.iterator();
            while (iterator.hasNext()) {
                json.append(value(iterator.next()));
                if (iterator.hasNext()) {
                    json.append(",");
                }
            }
            return json.append("]").toString();
        }
        return quote(String.valueOf(value));
    }

    private static String quote(String text) {
        StringBuilder out = new StringBuilder("\"");
        for (char c : text.toCharArray()) {
            switch (c) {
                case '"' -> out.append("\\\"");
                case '\\' -> out.append("\\\\");
                case '\n' -> out.append("\\n");
                case '\r' -> out.append("\\r");
                case '\t' -> out.append("\\t");
                default -> out.append(c);
            }
        }
        return out.append("\"").toString();
    }
}