// ── The model, with no database ───────────────────────────────────────────
//
// The `.db.js` / `.model.js` split pays for itself here: the logic worth testing
// is in the model, and the model's only dependency is a function that returns a
// row. Stub that and there is nothing to stand up.

const test = require('node:test')
const assert = require('node:assert')

const db = require('../model/worldStatus/worldStatus.db')
const { getPublicStatus, STALE_AFTER_MS } = require('../model/worldStatus/worldStatus.model')

const NOW = Date.parse('2026-08-12T12:00:00Z')

/** Replace `getStatus` for one test and put it back afterwards. */
function withRow(row, fn) {
  const real = db.getStatus
  db.getStatus = async () => row
  return Promise.resolve(fn()).finally(() => { db.getStatus = real })
}

test('a fresh row reports the world online', () =>
  withRow(
    { online: 1, players: 12, worldName: 'Example World', updatedAt: new Date(NOW - 1000) },
    async () => {
      const status = await getPublicStatus(NOW)
      assert.strictEqual(status.online, true)
      assert.strictEqual(status.players, 12)
      assert.strictEqual(status.worldName, 'Example World')
      assert.strictEqual(status.stale, false)
    },
  ))

test('a stale row is reported offline, whatever it says', () =>
  withRow(
    { online: 1, players: 12, worldName: 'Example World', updatedAt: new Date(NOW - STALE_AFTER_MS - 1) },
    async () => {
      const status = await getPublicStatus(NOW)
      // The row claims the world is up. Nothing has written it in longer than the
      // freshness window, so the claim is not evidence of anything.
      assert.strictEqual(status.online, false)
      assert.strictEqual(status.players, 0)
      assert.strictEqual(status.stale, true)
      // The name is still worth showing — it does not go stale the way a player
      // count does.
      assert.strictEqual(status.worldName, 'Example World')
    },
  ))

test('no row at all is an answer, not an error', () =>
  withRow(null, async () => {
    // A fresh install whose first boot has not finished replaying the schema.
    // The site must render; the next boot fixes it.
    const status = await getPublicStatus(NOW)
    assert.deepStrictEqual(status, {
      online: false, players: 0, worldName: null, updatedAt: null, stale: true,
    })
  }))