package com.zdxt.common.util;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONArray;
import com.alibaba.fastjson.JSONObject;
import com.fasterxml.jackson.databind.ObjectMapper;

import java.nio.charset.StandardCharsets;
import java.util.List;
import java.util.Map;

/**
 * Fastjson2 解析工具。
 * <p>
 * 兼容包对 String 走 JSONReaderUTF16，在部分 JDK（尤其 Oracle/麒麟 aarch64）上会误报
 * {@code invalid escape character EOI}。统一走 UTF-8 字节解析规避该问题，失败时再用 Jackson 兜底。
 */
public final class FastJsonUtil {

    private static final ObjectMapper JACKSON = new ObjectMapper();

    private FastJsonUtil() {
    }

    public static JSONObject parseObject(String text) {
        if (text == null) {
            return null;
        }
        String trimmed = text.trim();
        if (trimmed.isEmpty() || "null".equalsIgnoreCase(trimmed)) {
            return null;
        }
        try {
            // 关键 UTF-8 字节路径，避开 JSONReaderUTF16 的 EOI 误判
            return JSON.parseObject(trimmed.getBytes(StandardCharsets.UTF_8));
        } catch (Exception fastjsonEx) {
            try {
                @SuppressWarnings("unchecked")
                Map<String, Object> map = JACKSON.readValue(trimmed, Map.class);
                return new JSONObject(map);
            } catch (Exception jacksonEx) {
                fastjsonEx.addSuppressed(jacksonEx);
                if (fastjsonEx instanceof RuntimeException) {
                    throw (RuntimeException) fastjsonEx;
                }
                throw new RuntimeException(fastjsonEx);
            }
        }
    }

    public static JSONArray parseArray(String text) {
        if (text == null) {
            return null;
        }
        String trimmed = text.trim();
        if (trimmed.isEmpty() || "null".equalsIgnoreCase(trimmed)) {
            return null;
        }
        try {
            Object parsed = JSON.parse(trimmed.getBytes(StandardCharsets.UTF_8));
            if (parsed instanceof JSONArray) {
                return (JSONArray) parsed;
            }
            if (parsed == null) {
                return null;
            }
            JSONArray arr = new JSONArray();
            arr.add(parsed);
            return arr;
        } catch (Exception fastjsonEx) {
            try {
                List<?> list = JACKSON.readValue(trimmed, List.class);
                return new JSONArray(list);
            } catch (Exception jacksonEx) {
                fastjsonEx.addSuppressed(jacksonEx);
                if (fastjsonEx instanceof RuntimeException) {
                    throw (RuntimeException) fastjsonEx;
                }
                throw new RuntimeException(fastjsonEx);
            }
        }
    }

    public static <T> T parseObject(String text, Class<T> clazz) {
        if (text == null) {
            return null;
        }
        String trimmed = text.trim();
        if (trimmed.isEmpty() || "null".equalsIgnoreCase(trimmed)) {
            return null;
        }
        try {
            return JSON.parseObject(trimmed.getBytes(StandardCharsets.UTF_8), clazz);
        } catch (Exception fastjsonEx) {
            try {
                return JACKSON.readValue(trimmed, clazz);
            } catch (Exception jacksonEx) {
                fastjsonEx.addSuppressed(jacksonEx);
                if (fastjsonEx instanceof RuntimeException) {
                    throw (RuntimeException) fastjsonEx;
                }
                throw new RuntimeException(fastjsonEx);
            }
        }
    }
}