// ── The read path's logic ─────────────────────────────────────────────────
//
// The model decides what a caller gets. Two properties are worth more than the
// rest, and both are about a caller who did something slightly wrong:
//
//   • a route that forgets to say who is asking gets the PUBLIC view;
//   • a caller asking for a million rows gets two hundred.

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

const { fakeCtx } = require('./_fakes')

function withCore() {
  require('../core')._reset()
  require('../core').init(fakeCtx())
}

test('the limit is bounded, whatever was asked for', () => {
  withCore()
  const model = require('../model/events/events.model')

  assert.equal(model.boundedLimit(10), 10)
  assert.equal(model.boundedLimit(undefined), 50)
  assert.equal(model.boundedLimit('nonsense'), 50)
  assert.equal(model.boundedLimit(-5), 50)
  assert.equal(model.boundedLimit(0), 50)
  assert.equal(model.boundedLimit(1e9), model.MAX_LIMIT)
  assert.equal(model.boundedLimit(12.9), 12)
})

test('kinds parse from one name or a list, and nothing means "not specified"', () => {
  withCore()
  const model = require('../model/events/events.model')

  assert.deepEqual(model.parseKinds('player.death'), ['player.death'])
  assert.deepEqual(model.parseKinds('player.death, player.chat'), ['player.death', 'player.chat'])

  // Null rather than an empty list: "I did not ask" and "I asked for nothing"
  // are different, and only the first means "whatever I am allowed".
  assert.equal(model.parseKinds(''), null)
  assert.equal(model.parseKinds(undefined), null)
  assert.equal(model.parseKinds(' , , '), null)
})

test('a reader who does not say who they are gets the public view', async () => {
  withCore()

  const db = require('../model/events/events.db')
  const model = require('../model/events/events.model')
  const original = db.recentEvents
  let asked = null

  db.recentEvents = async (args) => {
    asked = args
    return []
  }

  try {
    await model.recent({ serverId: 'main' })

    assert.ok(!asked.kinds.includes('player.banned'), 'no IP-carrying kind by default')
    assert.ok(asked.kinds.includes('player.death'))

    await model.recent({ serverId: 'main', admin: true })
    assert.ok(asked.kinds.includes('player.banned'), 'an admin who says so gets them')
  } finally {
    db.recentEvents = original
  }
})

test('asking only for kinds you may not see answers with nothing, and queries nothing', async () => {
  withCore()

  const db = require('../model/events/events.db')
  const model = require('../model/events/events.model')
  const original = db.recentEvents
  let called = false

  db.recentEvents = async () => {
    called = true
    return []
  }

  try {
    const rows = await model.recent({ serverId: 'main', kind: 'player.banned,player.approved' })

    assert.deepEqual(rows, [])
    assert.equal(called, false, 'a query with no permitted kinds must not reach the database')
  } finally {
    db.recentEvents = original
  }
})

test('a row whose stored frame will not parse still answers with its envelope', async () => {
  withCore()

  const db = require('../model/events/events.db')
  const model = require('../model/events/events.model')
  const original = db.recentEvents

  db.recentEvents = async () => [
    { id: 7, kind: 'player.death', t: 12, wipeId: 'w-1', steamId: 'p1', raw: '{not json' },
  ]

  try {
    const [row] = await model.recent({ serverId: 'main' })

    // One unreadable row must not fail a whole page. What is known is still
    // reported; the body is empty rather than absent.
    assert.equal(row.id, 7)
    assert.equal(row.kind, 'player.death')
    assert.deepEqual(row.frame, {})
  } finally {
    db.recentEvents = original
  }
})

test('the leaderboard answers numbers, never nulls', async () => {
  withCore()

  const db = require('../model/events/events.db')
  const model = require('../model/events/events.model')
  const original = db.leaderboard

  // SUM() over no rows is NULL in SQL, and a JOIN with no player row gives a
  // null name. A page that has to defend against both is a page with the
  // defence in three places.
  db.leaderboard = async () => [
    { steamId: 'p1', name: null, kills: null, deaths: '3', npcKills: null, playtimeSec: null },
  ]

  try {
    const [row] = await model.leaderboard({ serverId: 'main' })

    assert.equal(row.kills, 0)
    assert.equal(row.deaths, 3)
    assert.equal(row.npcKills, 0)
    assert.equal(row.playtimeSec, 0)
    assert.equal(row.name, null)
  } finally {
    db.leaderboard = original
  }
})