import { Router } from "express";
import { renderPdf } from "../services/browser.js";
import logger from "../services/logger.js";
import { templates, renderTemplate } from "../services/templates.js";
function sanitizeFilename(name) {
    return name.replace(/["\r\n\x00-\x1f]/g, "_").substring(0, 200);
}
export const templatesRouter = Router();
// GET /v1/templates — list available templates
templatesRouter.get("/", (_req, res) => {
    const list = Object.entries(templates).map(([id, t]) => ({
        id,
        name: t.name,
        description: t.description,
        fields: t.fields,
    }));
    res.json({ templates: list });
});
// POST /v1/templates/:id/render — render template to PDF
templatesRouter.post("/:id/render", async (req, res) => {
    try {
        const id = req.params.id;
        const template = templates[id];
        if (!template) {
            res.status(404).json({ error: `Template '${id}' not found` });
            return;
        }
        const data = req.body.data || req.body;
        // Validate required fields
        const missingFields = template.fields
            .filter((f) => f.required && (data[f.name] === undefined || data[f.name] === null || data[f.name] === ""))
            .map((f) => f.name);
        if (missingFields.length > 0) {
            res.status(400).json({
                error: "Missing required fields",
                missing: missingFields,
                hint: `Required fields for '${id}': ${template.fields.filter((f) => f.required).map((f) => f.name).join(", ")}`,
            });
            return;
        }
        const html = renderTemplate(id, data);
        const pdf = await renderPdf(html, {
            format: data._format || "A4",
            margin: data._margin,
        });
        const filename = sanitizeFilename(data._filename || `${id}.pdf`);
        res.setHeader("Content-Type", "application/pdf");
        res.setHeader("Content-Disposition", `inline; filename="${filename}"`);
        res.send(pdf);
    }
    catch (err) {
        logger.error({ err }, "Template render error");
        res.status(500).json({ error: "Template rendering failed", detail: err.message });
    }
});