import { Router } from "express";
import { renderPdf, renderUrlPdf } from "../services/browser.js";
import { markdownToHtml, wrapHtml } from "../services/markdown.js";
import dns from "node:dns/promises";
import logger from "../services/logger.js";
import net from "node:net";
function isPrivateIP(ip) {
    // IPv6 loopback/unspecified
    if (ip === "::1" || ip === "::")
        return true;
    // IPv6 link-local (fe80::/10)
    if (ip.toLowerCase().startsWith("fe8") || ip.toLowerCase().startsWith("fe9") ||
        ip.toLowerCase().startsWith("fea") || ip.toLowerCase().startsWith("feb"))
        return true;
    // IPv4-mapped IPv6
    if (ip.startsWith("::ffff:"))
        ip = ip.slice(7);
    if (!net.isIPv4(ip))
        return false;
    const parts = ip.split(".").map(Number);
    if (parts[0] === 0)
        return true; // 0.0.0.0/8
    if (parts[0] === 10)
        return true; // 10.0.0.0/8
    if (parts[0] === 127)
        return true; // 127.0.0.0/8
    if (parts[0] === 169 && parts[1] === 254)
        return true; // 169.254.0.0/16
    if (parts[0] === 172 && parts[1] >= 16 && parts[1] <= 31)
        return true; // 172.16.0.0/12
    if (parts[0] === 192 && parts[1] === 168)
        return true; // 192.168.0.0/16
    return false;
}
export const convertRouter = Router();
// POST /v1/convert/html
convertRouter.post("/html", async (req, res) => {
    let slotAcquired = false;
    try {
        // Reject non-JSON content types
        const ct = req.headers["content-type"] || "";
        if (!ct.includes("application/json")) {
            res.status(415).json({ error: "Unsupported Content-Type. Use application/json." });
            return;
        }
        const body = typeof req.body === "string" ? { html: req.body } : req.body;
        if (!body.html) {
            res.status(400).json({ error: "Missing 'html' field" });
            return;
        }
        // Acquire concurrency slot
        if (req.acquirePdfSlot) {
            await req.acquirePdfSlot();
            slotAcquired = true;
        }
        // Wrap bare HTML fragments
        const fullHtml = body.html.includes("<html")
            ? body.html
            : wrapHtml(body.html, body.css);
        const pdf = await renderPdf(fullHtml, {
            format: body.format,
            landscape: body.landscape,
            margin: body.margin,
            printBackground: body.printBackground,
        });
        const filename = body.filename || "document.pdf";
        res.setHeader("Content-Type", "application/pdf");
        res.setHeader("Content-Disposition", `inline; filename="${filename}"`);
        res.send(pdf);
    }
    catch (err) {
        logger.error({ err }, "Convert HTML error");
        if (err.message === "QUEUE_FULL") {
            res.status(429).json({ error: "Server busy - too many concurrent PDF generations. Please try again in a few seconds." });
            return;
        }
        res.status(500).json({ error: "PDF generation failed", detail: err.message });
    }
    finally {
        if (slotAcquired && req.releasePdfSlot) {
            req.releasePdfSlot();
        }
    }
});
// POST /v1/convert/markdown
convertRouter.post("/markdown", async (req, res) => {
    let slotAcquired = false;
    try {
        const body = typeof req.body === "string" ? { markdown: req.body } : req.body;
        if (!body.markdown) {
            res.status(400).json({ error: "Missing 'markdown' field" });
            return;
        }
        // Acquire concurrency slot
        if (req.acquirePdfSlot) {
            await req.acquirePdfSlot();
            slotAcquired = true;
        }
        const html = markdownToHtml(body.markdown, body.css);
        const pdf = await renderPdf(html, {
            format: body.format,
            landscape: body.landscape,
            margin: body.margin,
            printBackground: body.printBackground,
        });
        const filename = body.filename || "document.pdf";
        res.setHeader("Content-Type", "application/pdf");
        res.setHeader("Content-Disposition", `inline; filename="${filename}"`);
        res.send(pdf);
    }
    catch (err) {
        logger.error({ err }, "Convert MD error");
        if (err.message === "QUEUE_FULL") {
            res.status(429).json({ error: "Server busy - too many concurrent PDF generations. Please try again in a few seconds." });
            return;
        }
        res.status(500).json({ error: "PDF generation failed", detail: err.message });
    }
    finally {
        if (slotAcquired && req.releasePdfSlot) {
            req.releasePdfSlot();
        }
    }
});
// POST /v1/convert/url
convertRouter.post("/url", async (req, res) => {
    let slotAcquired = false;
    try {
        const body = req.body;
        if (!body.url) {
            res.status(400).json({ error: "Missing 'url' field" });
            return;
        }
        // URL validation + SSRF protection
        let parsed;
        try {
            parsed = new URL(body.url);
            if (!["http:", "https:"].includes(parsed.protocol)) {
                res.status(400).json({ error: "Only http/https URLs are supported" });
                return;
            }
        }
        catch {
            res.status(400).json({ error: "Invalid URL" });
            return;
        }
        // DNS lookup to block private/reserved IPs
        try {
            const { address } = await dns.lookup(parsed.hostname);
            if (isPrivateIP(address)) {
                res.status(400).json({ error: "URL resolves to a private/internal IP address" });
                return;
            }
        }
        catch {
            res.status(400).json({ error: "DNS lookup failed for URL hostname" });
            return;
        }
        // Acquire concurrency slot
        if (req.acquirePdfSlot) {
            await req.acquirePdfSlot();
            slotAcquired = true;
        }
        const pdf = await renderUrlPdf(body.url, {
            format: body.format,
            landscape: body.landscape,
            margin: body.margin,
            printBackground: body.printBackground,
            waitUntil: body.waitUntil,
        });
        const filename = body.filename || "page.pdf";
        res.setHeader("Content-Type", "application/pdf");
        res.setHeader("Content-Disposition", `inline; filename="${filename}"`);
        res.send(pdf);
    }
    catch (err) {
        logger.error({ err }, "Convert URL error");
        if (err.message === "QUEUE_FULL") {
            res.status(429).json({ error: "Server busy - too many concurrent PDF generations. Please try again in a few seconds." });
            return;
        }
        res.status(500).json({ error: "PDF generation failed", detail: err.message });
    }
    finally {
        if (slotAcquired && req.releasePdfSlot) {
            req.releasePdfSlot();
        }
    }
});