import { Router } from 'express';
import type { WebContext } from '../context.js';

export function createConfigRouter(ctx: WebContext): Router {
  const router = Router();

  router.get('/config', (_req, res) => {
    res.json({
      rateLimit: ctx.runtimeConfig.rateLimit,
      browser: { dryRun: ctx.runtimeConfig.browser.dryRun },
      reddit: ctx.runtimeConfig.reddit,
    });
  });

  router.put('/config', (req, res) => {
    try {
      const updates = req.body;

      if (updates.rateLimit) {
        if (typeof updates.rateLimit.minDelayBetweenMessagesMs === 'number') {
          ctx.runtimeConfig.rateLimit.minDelayBetweenMessagesMs = Math.max(
            0,
            updates.rateLimit.minDelayBetweenMessagesMs,
          );
        }
        if (typeof updates.rateLimit.maxMessagesPerHour === 'number') {
          ctx.runtimeConfig.rateLimit.maxMessagesPerHour = Math.max(
            1,
            updates.rateLimit.maxMessagesPerHour,
          );
        }
        if (typeof updates.rateLimit.jitterMs === 'number') {
          ctx.runtimeConfig.rateLimit.jitterMs = Math.max(0, updates.rateLimit.jitterMs);
        }
      }

      if (updates.browser) {
        if (typeof updates.browser.dryRun === 'boolean') {
          ctx.runtimeConfig.browser.dryRun = updates.browser.dryRun;
        }
      }

      if (updates.reddit) {
        if (typeof updates.reddit.prioritizeRecentPosts === 'boolean') {
          ctx.runtimeConfig.reddit.prioritizeRecentPosts = updates.reddit.prioritizeRecentPosts;
        }
        if (typeof updates.reddit.recentWindowMinutes === 'number' && updates.reddit.recentWindowMinutes > 0) {
          ctx.runtimeConfig.reddit.recentWindowMinutes = updates.reddit.recentWindowMinutes;
        }
      }

      // Mirror into the loaded config so getStats reflects new values.
      ctx.config.rateLimit.minDelayBetweenMessagesMs = ctx.runtimeConfig.rateLimit.minDelayBetweenMessagesMs;
      ctx.config.rateLimit.maxMessagesPerHour = ctx.runtimeConfig.rateLimit.maxMessagesPerHour;
      ctx.config.rateLimit.jitterMs = ctx.runtimeConfig.rateLimit.jitterMs;
      ctx.config.browser.dryRun = ctx.runtimeConfig.browser.dryRun;
      ctx.config.reddit.prioritizeRecentPosts = ctx.runtimeConfig.reddit.prioritizeRecentPosts;
      ctx.config.reddit.recentWindowMinutes = ctx.runtimeConfig.reddit.recentWindowMinutes;

      ctx.getOnConfigChange()?.(ctx.runtimeConfig);

      ctx.activity.push('info', 'Config updated via dashboard');
      ctx.broadcaster.push('info', 'Configuration updated via dashboard', updates);

      res.json({ success: true, config: ctx.runtimeConfig });
    } catch (error) {
      ctx.logger.error('Failed to update config:', error);
      res.status(400).json({ error: String(error) });
    }
  });

  return router;
}