package com.aicheck.notify;

import com.aicheck.model.ApiEndpoint;
import com.aicheck.model.ClassChangeReport;
import com.aicheck.model.ClassType;
import com.aicheck.model.FieldChange;
import okhttp3.MediaType;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.RequestBody;
import okhttp3.Response;

import java.io.IOException;
import java.util.List;
import java.util.concurrent.TimeUnit;

public class WeComNotifier {
    private static final int MAX_LENGTH = 3800;
    private static final MediaType JSON = MediaType.get("application/json; charset=utf-8");

    private final OkHttpClient client = new OkHttpClient.Builder()
            .connectTimeout(10, TimeUnit.SECONDS)
            .readTimeout(10, TimeUnit.SECONDS)
            .build();

    public int sendAll(String webhookUrl, List<ClassChangeReport> reports, String modifier, String modifyTime) {
        if (reports == null || reports.isEmpty()) {
            System.out.println("无类变更，不发送到企业微信");
            return 0;
        }

        int sent = 0;
        for (ClassChangeReport report : reports) {
            String markdown = buildMarkdown(report, modifier, modifyTime);
            if (postMarkdown(webhookUrl, markdown)) {
                sent++;
                System.out.println("已发送类变更通知: " + report.getClassName());
            }
        }
        if (sent > 0) {
            System.out.println("总共发送 " + sent + " 条类变更通知到企业微信");
        }
        return sent;
    }

    public String buildMarkdown(ClassChangeReport report, String modifier, String modifyTime) {
        StringBuilder sb = new StringBuilder();
        sb.append("# 【类变更通知】").append("\n\n");
        sb.append("■ 变更对象：**").append(report.getClassName()).append("**（")
                .append(report.getClassType().getLabel()).append("）").append("\n");
        sb.append("■ 修改人：").append(modifier).append("\n");
        sb.append("■ 修改时间：").append(modifyTime).append("\n\n");
        sb.append("────────────────────────────────").append("\n");
        sb.append("▶ 对象变更细节").append("\n");
        sb.append("────────────────────────────────").append("\n");

        if (report.isDeleted()) {
            sb.append("[已删除] 该类文件已被移除").append("\n\n");
        } else {
            sb.append("字段变更列表：").append("\n");
            for (FieldChange change : report.getFieldChanges()) {
                sb.append(formatFieldChange(change)).append("\n");
            }
            sb.append("\n");
        }

        sb.append("────────────────────────────────").append("\n");
        sb.append("▶ 影响范围").append("\n");
        sb.append("────────────────────────────────").append("\n");
        appendImpactSections(sb, report);
        return truncate(sb.toString());
    }

    private void appendImpactSections(StringBuilder sb, ClassChangeReport report) {
        if (report.getClassType() == ClassType.ENTITY) {
            sb.append("① 入参影响（Dto变更导致接口参数变化）：").append("\n");
            sb.append("  无").append("\n\n");
            sb.append("② 类转换影响（Dto → Entity 转换，已开启检测）：").append("\n");
            sb.append("  无").append("\n\n");
            sb.append("③ 前端影响（Vo变更导致返回结构变化）：").append("\n");
            sb.append("  无").append("\n");
            return;
        }

        sb.append("① 入参影响（Dto变更导致接口参数变化）：").append("\n");
        appendEndpointList(sb, report.getInputImpactEndpoints());

        sb.append("\n");
        sb.append("② 类转换影响（Dto → Entity 转换");
        if (report.isConversionCheckEnabled()) {
            sb.append("，已开启检测");
        }
        sb.append("）：").append("\n");
        if (!report.isConversionCheckEnabled()) {
            sb.append("  未开启检测").append("\n\n");
        } else if (report.getConversionEntities().isEmpty()) {
            sb.append("  无").append("\n\n");
        } else {
            for (String entity : report.getConversionEntities()) {
                sb.append("  涉及Entity类：").append(entity).append("\n");
            }
            sb.append("\n");
        }

        sb.append("③ 前端影响（Vo变更导致返回结构变化）：").append("\n");
        appendEndpointList(sb, report.getFrontendImpactEndpoints());
    }

    private void appendEndpointList(StringBuilder sb, List<ApiEndpoint> endpoints) {
        if (endpoints == null || endpoints.isEmpty()) {
            sb.append("  无").append("\n");
            return;
        }
        sb.append("  影响接口列表：").append("\n");
        for (ApiEndpoint endpoint : endpoints) {
            sb.append("    - ").append(endpoint.displayLine()).append("\n");
        }
    }

    private String formatFieldChange(FieldChange change) {
        String desc = change.getDescription() == null || change.getDescription().isBlank()
                ? "无" : change.getDescription();
        switch (change.getKind()) {
            case ADDED:
                return "  [新增] 字段名: " + change.getFieldName() + "  说明: " + desc;
            case REMOVED:
                return "  [删除] 字段名: " + change.getFieldName() + "  说明: " + desc;
            case MODIFIED:
            default:
                String detail = change.getDetail() == null || change.getDetail().isBlank()
                        ? desc : change.getDetail();
                return "  [修改] 字段名: " + change.getFieldName() + "  说明: " + detail;
        }
    }

    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) + "}}";
        Request request = new Request.Builder()
                .url(webhookUrl)
                .post(RequestBody.create(payload, JSON))
                .build();
        try (Response response = client.newCall(request).execute()) {
            if (response.isSuccessful() && response.body() != null) {
                String body = response.body().string();
                return body.contains("\"errcode\":0");
            }
            System.out.println("[错误] 企微返回异常: " + response.code()
                    + (response.body() != null ? " " + response.body().string() : ""));
            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 + "\"";
    }
}