/**
 * Caddy upstreams routes
 *
 * Exposes:
 *   GET    /api/v1/caddy/upstreams                       — full snapshot
 *   GET    /api/v1/caddy/upstreams/incidents             — open dead-upstream incidents (via healthChecker)
 *   POST   /api/v1/caddy/upstreams/:host/mute            — body { muted: true|false }  (also via query ?muted=true)
 *
 * Auth: same as the rest of /api/v1 — handled by the global middleware
 * (the router is mounted under the auth-gated apiRouter in app.js).
 *
 * @module routes/caddy-upstreams
 */

const express = require('express');
const { success, errorResponse } = require('../src/utils/responses');
const { ValidationError } = require('../src/utilities/errors');

module.exports = function({ asyncHandler, caddyUpstreamWatcher, healthChecker }) {
  const router = express.Router();

  router.get('/caddy/upstreams', asyncHandler(async (req, res) => {
    if (!caddyUpstreamWatcher) {
      return errorResponse(res, 'Caddy upstream watcher not initialized', 503);
    }
    success(res, caddyUpstreamWatcher.snapshot());
  }, 'caddy-upstreams-list'));

  router.get('/caddy/upstreams/incidents', asyncHandler(async (req, res) => {
    if (!healthChecker) {
      return success(res, { incidents: [] });
    }
    // Filter the in-memory incidents array to caddy-upstream-dead entries.
    const all = Array.isArray(healthChecker.incidents) ? healthChecker.incidents : [];
    const open = all
      .filter((i) => i && i.type === 'caddy-upstream-dead' && i.status === 'open')
      .map((i) => ({
        id: i.id,
        serviceId: i.serviceId,
        type: i.type,
        message: i.message,
        severity: i.severity,
        createdAt: i.createdAt,
        lastOccurrence: i.lastOccurrence,
        occurrences: i.occurrences,
        details: i.details
      }));
    success(res, { incidents: open });
  }, 'caddy-upstreams-incidents'));

  // POST /caddy/upstreams/mute  body { host, muted }
  // POST /caddy/upstreams/:host/mute  body { muted: true } OR query ?muted=true
  // Both shapes supported because the dashboard code is small and either is
  // ergonomic depending on caller.
  const handleMute = asyncHandler(async (req, res) => {
    if (!caddyUpstreamWatcher) {
      return errorResponse(res, 'Caddy upstream watcher not initialized', 503);
    }
    const host = req.params.host || req.body?.host;
    if (!host || typeof host !== 'string' || !/^[a-z0-9._:-]+$/i.test(host)) {
      throw new ValidationError('host must be a valid host[:port] string');
    }
    // Accept muted as boolean body field OR ?muted=true|false query OR
    // a { muted: true|false } JSON body. Default to toggling on bare POST
    // without a muted value (this is the "mute it" path).
    let muted;
    if (typeof req.body?.muted === 'boolean') muted = req.body.muted;
    else if (typeof req.query.muted === 'string') muted = req.query.muted === 'true';
    else muted = true; // POST with no body = mute

    const result = caddyUpstreamWatcher.setMuted(host, muted);
    success(res, result);
  }, 'caddy-upstreams-mute');

  // Bare /mute with JSON body {host, muted}. Default mutes when muted is
  // absent or unparseable; require muted === false explicitly to unmute.
  router.post('/caddy/upstreams/mute', asyncHandler(async (req, res) => {
    if (!caddyUpstreamWatcher) {
      return errorResponse(res, 'Caddy upstream watcher not initialized', 503);
    }
    const { host, muted } = req.body || {};
    if (!host || typeof host !== 'string' || !/^[a-z0-9._:-]+$/i.test(host)) {
      throw new ValidationError('host must be a valid host[:port] string');
    }
    // Explicit boolean coercion — string 'false' should NOT mute.
    const wantMuted = muted === undefined ? true : muted === true;
    if (caddyUpstreamWatcher.upstreams && !caddyUpstreamWatcher.upstreams.has(host)) {
      throw new ValidationError(`host ${host} is not a known upstream (run scan first)`);
    }
    const result = caddyUpstreamWatcher.setMuted(host, wantMuted);
    success(res, result);
  }, 'caddy-upstreams-mute-bare'));

  // /:host/mute and /:host/unmute for path-style toggles
  router.post('/caddy/upstreams/:host/mute', handleMute);
  router.post('/caddy/upstreams/:host/unmute', asyncHandler(async (req, res) => {
    if (!caddyUpstreamWatcher) {
      return errorResponse(res, 'Caddy upstream watcher not initialized', 503);
    }
    const host = req.params.host;
    if (!host || !/^[a-z0-9._:-]+$/i.test(host)) {
      throw new ValidationError('host must be a valid host[:port] string');
    }
    const result = caddyUpstreamWatcher.setMuted(host, false);
    success(res, result);
  }, 'caddy-upstreams-unmute'));

  return router;
};