package com.codechecker.common;

import java.io.IOException;
import java.net.URI;
import java.net.http.HttpClient;
import java.net.http.HttpRequest;
import java.net.http.HttpResponse;
import java.time.Duration;

/**
 * 企微 Markdown 发送（与具体变更类型解耦）。
 */
public class WeComMarkdownSender {
    private static final int MAX_LENGTH = 3800;

    private final HttpClient client = HttpClient.newBuilder()
            .connectTimeout(Duration.ofSeconds(10))
            .build();

    public boolean send(String webhookUrl, String content) {
        return postMarkdown(webhookUrl, truncate(content));
    }

    public void logPreview(String title, String content) {
        System.out.println("========== " + title + " ==========");
        System.out.println(content);
        System.out.println("========== 结束 ==========");
    }

    private boolean postMarkdown(String webhookUrl, String content) {
        if (webhookUrl == null || webhookUrl.isBlank() || webhookUrl.contains("YOUR_WECOM")) {
            System.out.println("[警告] 未配置有效的企业微信 Webhook URL");
            System.out.println("--- 通知预览 ---");
            System.out.println(content.length() > 1000 ? content.substring(0, 1000) : content);
            return false;
        }

        String payload = "{\"msgtype\":\"markdown\",\"markdown\":{\"content\":"
                + jsonEscape(content) + "}}";
        HttpRequest request = HttpRequest.newBuilder()
                .uri(URI.create(webhookUrl))
                .timeout(Duration.ofSeconds(10))
                .header("Content-Type", "application/json; charset=utf-8")
                .POST(HttpRequest.BodyPublishers.ofString(payload))
                .build();
        try {
            HttpResponse<String> response = client.send(request, HttpResponse.BodyHandlers.ofString());
            int statusCode = response.statusCode();
            if (statusCode >= 200 && statusCode < 300) {
                String body = response.body();
                return body != null && body.contains("\"errcode\":0");
            }
            String body = response.body();
            System.out.println("[错误] 企微返回异常: " + statusCode
                    + (body != null ? " " + body : ""));
            return false;
        } catch (InterruptedException e) {
            Thread.currentThread().interrupt();
            System.out.println("[错误] 发送企微消息失败: " + e.getMessage());
            return false;
        } catch (IOException e) {
            System.out.println("[错误] 发送企微消息失败: " + e.getMessage());
            return false;
        }
    }

    private String truncate(String text) {
        if (text.length() <= MAX_LENGTH) {
            return text;
        }
        return text.substring(0, MAX_LENGTH) + "\n\n... 消息过长，已截断";
    }

    private String jsonEscape(String text) {
        String escaped = text
                .replace("\\", "\\\\")
                .replace("\"", "\\\"")
                .replace("\n", "\\n")
                .replace("\r", "");
        return "\"" + escaped + "\"";
    }
}