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();
/**
 * @openapi
 * /v1/templates:
 *   get:
 *     tags: [Templates]
 *     summary: List available templates
 *     description: Returns a list of all built-in document templates with their required fields.
 *     security:
 *       - BearerAuth: []
 *       - ApiKeyHeader: []
 *     responses:
 *       200:
 *         description: List of templates
 *         content:
 *           application/json:
 *             schema:
 *               type: object
 *               properties:
 *                 templates:
 *                   type: array
 *                   items:
 *                     type: object
 *                     properties:
 *                       id:
 *                         type: string
 *                         example: invoice
 *                       name:
 *                         type: string
 *                         example: Invoice
 *                       description:
 *                         type: string
 *                       fields:
 *                         type: array
 *                         items:
 *                           type: object
 *                           properties:
 *                             name:
 *                               type: string
 *                             required:
 *                               type: boolean
 *                             description:
 *                               type: string
 *       401:
 *         description: Missing API key
 *       403:
 *         description: Invalid API key
 */
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 });
});
/**
 * @openapi
 * /v1/templates/{id}/render:
 *   post:
 *     tags: [Templates]
 *     summary: Render a template to PDF
 *     description: |
 *       Renders a built-in template with the provided data and returns a PDF.
 *       Use GET /v1/templates to see available templates and their required fields.
 *       Special fields: `_format` (page size), `_margin` (page margins), `_filename` (output filename).
 *     security:
 *       - BearerAuth: []
 *       - ApiKeyHeader: []
 *     parameters:
 *       - in: path
 *         name: id
 *         required: true
 *         schema:
 *           type: string
 *         description: Template ID (e.g. "invoice", "receipt")
 *     requestBody:
 *       required: true
 *       content:
 *         application/json:
 *           schema:
 *             type: object
 *             properties:
 *               data:
 *                 type: object
 *                 description: Template data (fields depend on template). Can also be passed at root level.
 *               _format:
 *                 type: string
 *                 enum: [A4, Letter, Legal, A3, A5, Tabloid]
 *                 default: A4
 *                 description: Page size override
 *               _margin:
 *                 type: object
 *                 properties:
 *                   top: { type: string }
 *                   right: { type: string }
 *                   bottom: { type: string }
 *                   left: { type: string }
 *                 description: Page margin override
 *               _filename:
 *                 type: string
 *                 description: Custom output filename
 *     responses:
 *       200:
 *         description: PDF document
 *         content:
 *           application/pdf:
 *             schema:
 *               type: string
 *               format: binary
 *       400:
 *         description: Missing required template fields
 *       401:
 *         description: Missing API key
 *       403:
 *         description: Invalid API key
 *       404:
 *         description: Template not found
 *       500:
 *         description: Template rendering failed
 */
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 });
    }
});