/**
 * DC-160: App Catalog API — curated templates with categories and search
 *
 * Exposes the existing app-templates.js as a browsable catalog.
 * GET /api/v1/catalog          — list all apps (with optional category filter)
 * GET /api/v1/catalog/:appId   — get details for a specific app
 * GET /api/v1/catalog/search   — search apps by name/category/keyword
 *
 * DC-160 FIX: the detail endpoint used to read `app.image` / `app.ports` /
 * `app.env` / `app.volumes` — but every template stores these under
 * `app.docker.*`. The result was a 200 with empty image/ports/env/volumes
 * for EVERY app. Now reads `app.docker.*` and additionally surfaces the
 * install-time config fields the App Selector needs to render its deploy
 * form (defaultPort, subdomain, healthCheck, mediaMount, claimToken,
 * difficulty, setupInstructions).
 */
const express = require('express');
const { ok, errorResponse } = require('../src/utils/responses');

module.exports = function({ APP_TEMPLATES, asyncHandler } = {}) {
  const wrap = asyncHandler || ((fn) => (req, res, next) => Promise.resolve(fn(req, res, next)).catch(next));
  const router = express.Router();

  // Normalize APP_TEMPLATES (array or { id: {...} } map) into a value array.
  const appArray = Array.isArray(APP_TEMPLATES)
    ? [...APP_TEMPLATES]
    : Object.values(APP_TEMPLATES || {});

  const appId = (t) => t.id || (t.name || '').toLowerCase().replace(/\s+/g, '-');

  const POPULAR = new Set([
    'plex', 'jellyfin', 'sonarr', 'radarr', 'nextcloud', 'gitea', 'qbittorrent',
  ]);

  // Catalog entry shape used by list + search results. Uses the template's
  // OWN category field (DC-160: the old hand-rolled CATEGORY_MAP guessed by
  // substring match — plex→media — which diverged from the templates'
  // real categories and mis-categorized anything unlisted).
  function listEntry(t) {
    return {
      id: appId(t),
      name: t.name,
      description: t.description || '',
      category: t.category || 'Other',
      logo: t.logo || null,
      difficulty: t.difficulty || null,
      popular: POPULAR.has(appId(t)),
    };
  }

  // GET /api/v1/catalog — list all apps
  router.get('/catalog', wrap(async (req, res) => {
    const { category, sort } = req.query;
    let entries = appArray.map(listEntry);

    // Filter by category (templates' own category, case-insensitive)
    if (category && category !== 'all') {
      const want = String(category).toLowerCase();
      entries = entries.filter((e) => String(e.category).toLowerCase() === want);
    }

    // Sort: default popular-first then name; sort=name alphabetical only.
    if (sort === 'name') {
      entries.sort((a, b) => a.name.localeCompare(b.name));
    } else {
      entries.sort((a, b) => {
        if (a.popular !== b.popular) return a.popular ? -1 : 1;
        return a.name.localeCompare(b.name);
      });
    }

    const categories = [...new Set(appArray.map((t) => t.category || 'Other'))].sort();

    ok(res, {
      total: entries.length,
      categories,
      apps: entries,
    });
  }));

  // GET /api/v1/catalog/search?q=plex
  router.get('/catalog/search', wrap(async (req, res) => {
    const q = (req.query.q || '').toLowerCase().trim();
    if (!q) {
      return errorResponse(res, 400, 'Search query (q) is required');
    }

    const apps = appArray
      .filter((t) => {
        const name = (t.name || '').toLowerCase();
        const desc = (t.description || '').toLowerCase();
        const cat = String(t.category || '').toLowerCase();
        const id = appId(t).toLowerCase();
        return name.includes(q) || desc.includes(q) || cat.includes(q) || id.includes(q);
      })
      .map(listEntry);

    ok(res, { query: q, results: apps.length, apps });
  }));

  // GET /api/v1/catalog/:appId — get specific app details (DC-160: reads app.docker.*)
  router.get('/catalog/:appId', wrap(async (req, res) => {
    const app = appArray.find((t) => appId(t) === req.params.appId);

    if (!app) {
      return errorResponse(res, 404, `App '${req.params.appId}' not found in catalog`);
    }

    const d = app.docker || {};
    ok(res, {
      id: app.id || req.params.appId,
      name: app.name,
      description: app.description || '',
      category: app.category || 'Other',
      image: d.image || '',
      ports: d.ports || [],
      env: d.environment || {},
      volumes: d.volumes || [],
      network: d.network || 'bridge',
      restart: d.restart || 'unless-stopped',
      defaultPort: app.defaultPort || null,
      subdomain: app.subdomain || appId(app),
      healthCheck: app.healthCheck || null,
      mediaMount: app.mediaMount || null,
      claimToken: app.claimToken || null,
      difficulty: app.difficulty || null,
      setupInstructions: app.setupInstructions || null,
    });
  }));

  return router;
};