// TriliumNext WechatSync Publisher
// 补丁目标: apps/server/src/services/publisher/wechatsync.ts
//
// 说明:
//   - checkBridge() / publish() 通过桥接 HTTP API（默认 9601）与 Chrome 扩展通信
//   - 若 Trilium 运行在 Docker 容器内，桥接在宿主机上，必须用 host.docker.internal
//     而非 localhost（容器内 localhost 指向容器自身）
//   - 桥接服务由 bridge/wechatsync-server.mjs 提供（PRIMARY 模式常驻）
//
// 环境变量:
//   BRIDGE_HOST  - 桥接主机（默认 host.docker.internal；宿主机裸跑可设 localhost）
//   SYNC_WS_PORT - WebSocket 端口（默认 9600），HTTP API = 端口+1

import { execSync } from "child_process";
import fs from "fs";
import path from "path";
import os from "os";
import { getLog } from "@triliumnext/core";
import type { Publisher, ArticleContent, PlatformConfig, PublishResult } from "./types.js";

const BRIDGE_HOST = process.env.BRIDGE_HOST || "host.docker.internal";
const BRIDGE_HTTP_PORT = parseInt(process.env.SYNC_WS_PORT || "9600", 10) + 1;
const BRIDGE_URL = `http://${BRIDGE_HOST}:${BRIDGE_HTTP_PORT}`;

export class WechatSyncPublisher implements Publisher {
    id: string = "wechatsync";
    name: string = "WechatSync 文章同步助手";
    icon: string = "bxl-wechat";

    async validateConfig(config: PlatformConfig) {
        const outDir = config.config.outputDir || path.join(os.homedir(), "wechatsync", "articles");
        try {
            fs.mkdirSync(outDir, { recursive: true });
            return { valid: true, message: "目录可写: " + outDir };
        } catch (e: any) {
            return { valid: false, message: e.message };
        }
    }

    /** 检查桥接服务器与 Chrome 扩展连接状态 */
    static async checkBridge() {
        try {
            const resp = await fetch(`${BRIDGE_URL}/status`);
            if (!resp.ok) {
                return { online: false, extensionConnected: false, error: `HTTP ${resp.status}` };
            }
            const data = await resp.json();
            return { online: true, extensionConnected: data.connected === true, error: undefined };
        } catch (e: any) {
            return { online: false, extensionConnected: false, error: e.message || "bridge unreachable" };
        }
    }

    async publish(article: ArticleContent, config: PlatformConfig): Promise<PublishResult> {
        const outDir = config.config.outputDir || path.join(os.homedir(), "wechatsync", "articles");
        const log = getLog();

        try {
            fs.mkdirSync(outDir, { recursive: true });
            const markdown = this.toMarkdown(article);
            const safeTitle = article.title.replace(/[<>:"/\\|?*]/g, "_").substring(0, 80);
            const filePath = path.join(outDir, safeTitle + "-" + Date.now() + ".md");
            fs.writeFileSync(filePath, markdown, "utf-8");
            log.info("WechatSync: 导出 → " + filePath);

            const maxRetries = 5;
            let draftUrl = "";
            let lastErr = "";

            for (let attempt = 0; attempt < maxRetries && !draftUrl; attempt++) {
                const bridge = await WechatSyncPublisher.checkBridge();

                if (!bridge.online) {
                    return {
                        platform: this.id, platformName: config.name, status: "failed",
                        errorMessage: `桥接 HTTP API 不在线（${BRIDGE_HOST}:${BRIDGE_HTTP_PORT}）`,
                        publishedAt: new Date().toISOString()
                    };
                }

                if (!bridge.extensionConnected) {
                    if (attempt < 2) {
                        log.info(`WechatSync: 等待扩展连接... (${attempt + 1}/${maxRetries})`);
                        await new Promise(r => setTimeout(r, 3000));
                        continue;
                    }
                    return {
                        platform: this.id, platformName: config.name, status: "failed",
                        errorMessage: `Chrome 扩展未连接桥接（等了 ${attempt * 3}s 仍未连上）`,
                        publishedAt: new Date().toISOString()
                    };
                }

                try {
                    const platArg = config.config.platforms ? "--platforms " + config.config.platforms : "";
                    const cmd = 'wechatsync sync "' + filePath + '" ' + platArg;
                    const out = execSync(cmd, {
                        timeout: 30000,
                        stdio: ["pipe", "pipe", "pipe"],
                        env: {
                            ...process.env,
                            SYNC_WS_PORT: String(BRIDGE_HTTP_PORT - 1),
                            SYNC_WS_HOST: BRIDGE_HOST
                        }
                    }).toString();
                    draftUrl = this.extractDraftUrl(out);
                    log.info("CLI输出: " + out.substring(0, 500));
                } catch (cliErr: any) {
                    const combined = (cliErr.stdout || "") + "\n" + (cliErr.stderr || "");
                    draftUrl = this.extractDraftUrl(combined);
                    lastErr = combined.substring(0, 200);
                    log.info("CLI(含stderr): " + combined.substring(0, 500));
                }

                if (!draftUrl && attempt < maxRetries - 1) {
                    log.info(`WechatSync: 未检测到 URL，重试 (${attempt + 1}/${maxRetries})...`);
                    await new Promise(r => setTimeout(r, 3000));
                }
            }

            return {
                platform: this.id, platformName: config.name,
                status: draftUrl ? "success" : "failed",
                url: draftUrl || undefined,
                errorMessage: draftUrl ? undefined : (lastErr || "未检测到返回的 URL，可能扩展未连接"),
                publishedAt: new Date().toISOString()
            };
        } catch (e: any) {
            return {
                platform: this.id, platformName: config.name, status: "failed",
                errorMessage: e.message, publishedAt: new Date().toISOString()
            };
        }
    }

    /** 从 CLI 输出中提取草稿编辑 URL（优先匹配各平台已知草稿页，排除图片链接） */
    extractDraftUrl(output: string): string {
        const urls: string[] = [];
        const urlRe = /https?:\/\/[^\s"<>)\]]+/g;
        let m: RegExpExecArray | null;
        while ((m = urlRe.exec(output)) !== null) urls.push(m[0]);

        const imageRe = /(?:img\.88531\.cn|i\.loli\.net|imgchr\.com|\.(?:png|jpg|jpeg|gif|webp|svg|ico)(?:\?|$))/i;
        const draftPatterns = [
            /mp\.weixin\.qq\.com\/cgi-bin\/appmsg/,     // 微信公众号
            /mp\.csdn\.net\/mp_blog\/creation/,         // CSDN
            /zhuanlan\.zhihu\.com\/p\//,                // 知乎
            /mp\.toutiao\.com\/profile_v4\//,           // 头条号
            /zhiyou\.smzdm\.com\/member\//,             // 什么值得买
            /juejin\.cn\/editor\/drafts\//,             // 掘金
            /segmentfault\.com\/\w+\/drafts/,           // 思否
            /weibo\.com\/ttarticle\/p\//,               // 微博
            /mp\.weixin\.qq\.com\/s\//                  // 公众号分享页
        ];
        for (const u of urls) for (const p of draftPatterns) if (p.test(u)) return u;
        // 无匹配时返回第一个非图片链接
        for (const u of urls) if (!imageRe.test(u)) return u;
        return "";
    }

    /** HTML → Markdown（带 title frontmatter） */
    toMarkdown(article: ArticleContent): string {
        const header = ["---", 'title: "' + article.title + '"', "---\n"];
        const body = article.content
            .replace(/<img[^>]*src="([^"]*)"[^>]*>/gi, "![image]($1)")
            .replace(/<h2[^>]*>/gi, "## ")
            .replace(/<\/h2>/gi, "\n\n")
            .replace(/<h3[^>]*>/gi, "### ")
            .replace(/<\/h3>/gi, "\n\n")
            .replace(/<p[^>]*>/gi, "")
            .replace(/<\/p>/gi, "\n\n")
            .replace(/<strong>/gi, "**")
            .replace(/<\/strong>/gi, "**")
            .replace(/<a[^>]*href="([^"]*)"[^>]*>([\s\S]*?)<\/a>/gi, "[$2]($1)")
            .replace(/<br\s*\/?>/gi, "\n")
            .replace(/<[^>]*>/g, "")
            .replace(/\n{3,}/g, "\n\n")
            .trim();
        return header.join("\n") + body;
    }
}