import { respondWithAuthenticatedUser } from '../../auth/meJson.js';
import * as db from '../../../db/googleAuth.js';
import { toPictureBuffer } from '../../../util/pictureBinary.js';

/**
 * Registers the current-user route (requires prior auth middleware populating `req.user`).
 * @param {import('express').Application} app - Express app
 * @param {string} [basePath=''] - Optional URL prefix for all routes in this module
 */
export function register(app, basePath = '') {
    /**
     * @openapi
     * /auth/me:
     *   get:
     *     tags: [Auth]
     *     summary: Current user
     *     description: |
     *       Returns the authenticated user from the session cookie and the Google client ID.
     *       `user.picture` is the stored profile image as a base64 string when present.
     *       Unauthenticated calls still receive `googleClientId` with 401.
     *     security:
     *       - cookieAuth: []
     *     x-markdown: auth/me.md
     *     responses:
     *       200:
     *         description: Authenticated
     *         content:
     *           application/json:
     *             schema:
     *               type: object
     *               properties:
     *                 user:
     *                   $ref: '#/components/schemas/User'
     *                 googleClientId:
     *                   type: string
     *       401:
     *         description: Unauthorized — still includes `googleClientId` for the frontend
     *         content:
     *           application/json:
     *             schema:
     *               type: object
     *               properties:
     *                 error:
     *                   type: string
     *                 googleClientId:
     *                   type: string
     */
    app.get(`${basePath}/auth/me`, async (req, res) => {
        try {
            const row = await db.getById(req.user.id);
            if (!row) {
                return respondWithAuthenticatedUser(res, 403, { error: 'User is no longer authorized' });
            }

            const pictureBinary = toPictureBuffer(row.pictureBinary);
            const user = {
                id: row.id,
                email: row.email,
                selectedCompanyId: row.selectedCompanyId,
                ...(pictureBinary && { picture: pictureBinary.toString('base64') }),
            };
            respondWithAuthenticatedUser(res, 200, { user });
        } catch (error) {
            console.error('Get current user failed:', error);
            respondWithAuthenticatedUser(res, 500, { error: 'Failed to load user' });
        }
    });
}