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package com.alibaba.fastjson2.function.impl;

import com.alibaba.fastjson2.JSONException;

import java.util.function.Function;

public class ToBoolean
        implements Function {
    final Boolean defaultValue;

    public ToBoolean(Boolean defaultValue) {
        this.defaultValue = defaultValue;
    }

    @Override
    public Object apply(Object o) {
        if (o == null) {
            return defaultValue;
        }

        if (o instanceof Boolean) {
            return o;
        }

        if (o instanceof Number) {
            return ((Number) o).intValue() == 1;
        }

        if (o instanceof String) {
            String str = (String) o;
            switch (str) {
                case "true":
                case "TRUE":
                case "True":
                case "T":
                case "Y":
                case "YES":
                case "Yes":
                case "yes":
                    return Boolean.TRUE;
                case "false":
                case "FALSE":
                case "False":
                case "F":
                case "N":
                case "NO":
                case "no":
                case "No":
                    return Boolean.FALSE;
                case "null":
                    return defaultValue;
                default:
                    break;
            }
        }

        throw new JSONException("can not cast to Byte " + o.getClass());
    }
}