// ── Test harness: a fake ctx ───────────────────────────────────────────────
//
// A module's tests cannot require core — that is the whole zero-internal-imports
// rule (docs/website/MODULE_API.md §5.1), and it applies to test files too. So
// instead of stubbing core's modules the way core's own tests do, a module test
// hands `core.init()` a ctx it fabricated.
//
// That turns out to be the nicer story: the seam that exists so a module can be
// swapped onto a different core is the same seam that lets its tests run with no
// database, no express app and no settings table. Core's tests reach the same
// place by pointing the mariadb pool at a dead port; a module does not have to.

const core = require('../core')

/**
 * Build and install a fake ctx. Every member is a stub the test can reassign.
 * @param {object} [over] members to override, deep-merged one level
 */
function installFakeCtx(over = {}) {
  const settings = new Map()

  const ctx = {
    moduleId: 'uo',
    paths: { moduleRoot: require('path').join(__dirname, '..', '..') },
    // Null, not the real packages: a module cannot resolve express from outside
    // server/ (that is why ctx carries them at all), and these tests construct no
    // router. A test that needs one passes the real ones in `over`.
    express: null,
    validator: null,
    db: {
      // Every test that needs a query result reassigns this.
      query: async () => [],
      pool: { getConnection: async () => { throw new Error('no pool in tests') } },
    },
    log: () => ({ error() {}, warn() {}, info() {}, debug() {} }),
    settings: {
      get: async (key) => (settings.has(key) ? settings.get(key) : null),
      set: async (key, value) => { settings.set(key, value) },
      getInstanceName: async () => 'Test Shard',
    },
    auth: { getUserFromRequest: () => null },
    push: { publish: async () => {} },
    secretBox: { encrypt: (s) => s, decrypt: (s) => s },
    middleware: {
      requireAuth: (req, res, next) => next(),
      requireRole: () => (req, res, next) => next(),
      siteMode: (req, res, next) => next(),
      validate: (req, res, next) => next(),
      noindex: (req, res, next) => next(),
    },
    uploads: {},
    posts: {},
    ...over,
  }

  core.init(ctx)
  return ctx
}

module.exports = { installFakeCtx }