// ── The ingest ────────────────────────────────────────────────────────────
//
// Every test here is about one of three things, and all three are mistakes that
// look correct in review:
//
//   • **who gets credited.** A suicide must not credit the victim with a kill.
//     That single line would produce a leaderboard topped by whoever died most,
//     and it would look plausible for a whole wipe.
//   • **the cursor's ordering.** It advances AFTER the batch, never before, so a
//     crash re-reads rather than skips. Skipping is silent and permanent.
//   • **absent is not zero.** A session whose start was never seen contributes
//     no playtime rather than zero playtime.
//
// The database is a recorder. Asserting the SQL exactly would be a test of the
// SQL's punctuation, so each case asserts the *statement shape* and the values —
// which table was written, and with what.

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

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

/** Installs a core whose `db.query` records every statement. */
function withRecorder() {
  const statements = []

  const ctx = fakeCtx({
    db: {
      query: (sql, params = []) => {
        statements.push({ sql, params })
        return Promise.resolve([])
      },
      pool: {},
    },
  })

  require('../core')._reset()
  require('../core').init(ctx)

  return {
    statements,
    /** Every statement that touched a table, with its parameters. */
    touching(table) {
      return statements.filter((s) => s.sql.includes(table))
    },
  }
}

const frame = (over = {}) => ({
  type: 'event',
  t: 1789560564452,
  serverId: 'main',
  wipeId: 'w-20260915T195817Z',
  ...over,
})

const item = (kind, over = {}) => ({ id: 1, t: 1, kind, frame: frame({ kind, ...over }) })

test('every frame is stored, whether or not this build understands it', async () => {
  const rec = withRecorder()
  const { apply } = require('../ingest')

  await apply('main', item('player.death', { steamId: '76561198000000001' }))
  await apply('main', item('something.from.protocol.9'))

  const stored = rec.touching('rust_events')
  assert.equal(stored.length, 2, 'an unrecognised kind must still be stored')

  // The one copy of an event a later version will know how to read is the one
  // this version chose not to throw away.
  assert.ok(stored[1].params.includes('something.from.protocol.9'))
})

test('a wipe exists because a frame mentioned it', async () => {
  const rec = withRecorder()
  const { apply } = require('../ingest')

  await apply('main', item('player.chat', { steamId: '1', message: 'hello' }))

  const wipes = rec.touching('rust_wipes')
  assert.equal(wipes.length, 1)
  assert.deepEqual(wipes[0].params.slice(0, 2), ['main', 'w-20260915T195817Z'])
})

test('a kill credits the attacker and a death the victim', async () => {
  const rec = withRecorder()
  const { apply } = require('../ingest')

  await apply(
    'main',
    item('player.death', {
      steamId: 'victim',
      attackerType: 'player',
      attackerId: 'killer',
      attackerName: 'Killer',
    }),
  )

  const stats = rec.touching('rust_player_wipe_stats')
  assert.equal(stats.length, 2, 'one row for the victim, one for the attacker')

  // The parameter order is (server, wipe, steam, kills, deaths, suicides, ...).
  const victim = stats.find((s) => s.params[2] === 'victim')
  const killer = stats.find((s) => s.params[2] === 'killer')

  assert.ok(victim && killer)
  assert.equal(victim.params[3], 0, 'the victim scored no kill')
  assert.equal(victim.params[4], 1, 'the victim died once')
  assert.equal(killer.params[3], 1, 'the attacker scored one kill')
  assert.equal(killer.params[4], 0, 'the attacker did not die')
})

test('a suicide is a death and a suicide, and credits nobody with a kill', async () => {
  const rec = withRecorder()
  const { apply } = require('../ingest')

  await apply('main', item('player.death', { steamId: 'victim', attackerType: 'self' }))

  const stats = rec.touching('rust_player_wipe_stats')
  assert.equal(stats.length, 1, 'nobody is credited with the kill')
  assert.equal(stats[0].params[4], 1, 'it is still a death')
  assert.equal(stats[0].params[5], 1, 'and a suicide')
  assert.equal(stats[0].params[3], 0)
})

test('an environment or NPC death credits no attacker', async () => {
  for (const attackerType of ['environment', 'npc']) {
    const rec = withRecorder()
    const { apply } = require('../ingest')

    await apply('main', item('player.death', { steamId: 'victim', attackerType }))

    const stats = rec.touching('rust_player_wipe_stats')
    assert.equal(stats.length, 1, `${attackerType} must credit nobody`)
    assert.equal(stats[0].params[4], 1)
  }
})

test('an absent session length adds no playtime and no session', async () => {
  const rec = withRecorder()
  const { apply } = require('../ingest')

  // A player who was already on the server when the plugin loaded: the plugin
  // omits `sessionSec` rather than sending 0, and the difference has to survive
  // all the way to the column. Adding a zero would record a session of no
  // length, which is a different claim from recording no session.
  await apply('main', item('player.disconnected', { steamId: 'p1', reason: 'quit' }))

  const stats = rec.touching('rust_player_wipe_stats')
  assert.equal(stats[0].params[8], 0, 'no session counted')
  assert.equal(stats[0].params[9], 0, 'no playtime added')

  const rec2 = withRecorder()
  await require('../ingest').apply(
    'main',
    item('player.disconnected', { steamId: 'p1', sessionSec: 600 }),
  )

  const counted = rec2.touching('rust_player_wipe_stats')
  assert.equal(counted[0].params[8], 1)
  assert.equal(counted[0].params[9], 600)
})

test('a tally is added per resource, as a delta', async () => {
  const rec = withRecorder()
  const { apply } = require('../ingest')

  await apply(
    'main',
    item('player.tally', {
      steamId: 'p1',
      gathered: { wood: 1200, stones: 300 },
      npcKills: 3,
      structures: 2,
    }),
  )

  const gathered = rec.touching('rust_gather_totals')
  assert.equal(gathered.length, 2)
  assert.deepEqual(
    gathered.map((g) => [g.params[3], g.params[4]]),
    [
      ['wood', 1200],
      ['stones', 300],
    ],
  )

  const stats = rec.touching('rust_player_wipe_stats')
  assert.equal(stats[0].params[6], 3, 'npc kills')
  assert.equal(stats[0].params[7], 2, 'structures')

  // `amount = amount + VALUES(amount)` is what makes a delta correct. A running
  // total on the wire would double every number here, slowly, looking right.
  assert.match(gathered[0].sql, /amount = amount \+ VALUES\(amount\)/)
})

test('a new server starts at the feed tail, not at the beginning of history', async () => {
  withRecorder()

  const sidecar = require('../sidecarClient')
  const db = require('../model/events/events.db')
  const ingest = require('../ingest')

  const originalTail = sidecar.feedTail
  const originalCursor = db.getCursor
  const originalSet = db.setCursor
  const written = []

  db.getCursor = async () => null
  db.setCursor = async (...args) => written.push(args)
  sidecar.feedTail = async () => ({ ok: true, status: 'ok', data: { lastId: 4021, items: [] } })

  try {
    const applied = await ingest.ingestServer({ id: 'main' })

    assert.equal(applied, 0, 'nothing is replayed')
    assert.deepEqual(written, [['main', 4021, 0]], 'the cursor starts at the end')
  } finally {
    sidecar.feedTail = originalTail
    db.getCursor = originalCursor
    db.setCursor = originalSet
  }
})

test('an unreachable sidecar writes no cursor at all', async () => {
  withRecorder()

  const sidecar = require('../sidecarClient')
  const db = require('../model/events/events.db')
  const ingest = require('../ingest')

  const originalTail = sidecar.feedTail
  const originalCursor = db.getCursor
  const originalSet = db.setCursor
  const written = []

  db.getCursor = async () => null
  db.setCursor = async (...args) => written.push(args)
  sidecar.feedTail = async () => ({ ok: false, status: 'transport-error', data: null })

  try {
    await ingest.ingestServer({ id: 'main' })

    // A cursor of 0 written here would replay the sidecar's whole retained
    // history the moment it came back — which is the failure that looks like a
    // working catch-up until somebody reads the leaderboard.
    assert.deepEqual(written, [])
  } finally {
    sidecar.feedTail = originalTail
    db.getCursor = originalCursor
    db.setCursor = originalSet
  }
})

test('the cursor advances after the batch, and one bad event does not wedge it', async () => {
  withRecorder()

  const sidecar = require('../sidecarClient')
  const db = require('../model/events/events.db')
  const ingest = require('../ingest')

  const originals = {
    feed: sidecar.feed,
    getCursor: db.getCursor,
    setCursor: db.setCursor,
    insertEvent: db.insertEvent,
  }

  const order = []

  db.getCursor = async () => ({ lastEventId: 10 })
  db.setCursor = async (_id, last) => order.push(`cursor:${last}`)
  db.insertEvent = async (row) => {
    order.push(`event:${row.kind}`)
    if (row.kind === 'player.chat') throw new Error('malformed')
  }

  sidecar.feed = async (_server, since) =>
    since === 10
      ? {
          ok: true,
          status: 'ok',
          data: {
            items: [item('player.chat'), item('player.connected', { steamId: 'p1' })],
            lastId: 12,
            more: false,
          },
        }
      : { ok: true, status: 'ok', data: { items: [], lastId: since, more: false } }

  try {
    const applied = await ingest.ingestServer({ id: 'main' })

    // The bad row is logged and skipped; the good one still counts.
    assert.equal(applied, 1)

    // And the ordering the whole design rests on: every event is written before
    // the cursor moves past it.
    assert.deepEqual(order, ['event:player.chat', 'event:player.connected', 'cursor:12'])
  } finally {
    Object.assign(db, {
      getCursor: originals.getCursor,
      setCursor: originals.setCursor,
      insertEvent: originals.insertEvent,
    })
    sidecar.feed = originals.feed
  }
})

test('a board replaces presence rather than appending to it', async () => {
  const rec = withRecorder()
  const ingest = require('../ingest')

  await ingest.applyBoards('main', {
    'players.online': {
      kind: 'players.online',
      type: 'snapshot',
      count: 1,
      players: [{ steamId: 'p1', name: 'One', sleeping: false }],
    },
  })

  const presence = rec.touching('rust_presence')

  // The DELETE is what makes it a board. Without it a player who left stays
  // online for ever, which is the exact drift the board exists to correct.
  assert.match(presence[0].sql, /^DELETE FROM rust_presence/)
  assert.match(presence[1].sql, /INSERT INTO rust_presence/)
})