// ── Event series, the arc (EVENTS.md §D/§I, Phase 4) ───────────────────────
//
// One small table, and the reason it is worth testing at all is the two rules
// that are not obvious from its four columns:
//
//   • the slug is derived once and FROZEN. The public arc page lives at it, so
//     a rename that moved it would break every link — including the ones inside
//     the Discord posts this feature will eventually write.
//   • the delete is a real delete, and it is the only one in this feature. A
//     definition is archived instead, because a run pins its version and history
//     that cannot be explained defeats the audit. A series pins nothing: it is a
//     label, `series_id` is ON DELETE SET NULL, and the count of what it detached
//     is what an operator needs to be told.

process.env.DB_HOST = '127.0.0.1'
process.env.DB_PORT = '59999'

const { test, beforeEach, afterEach, after } = require('node:test')
const assert = require('node:assert/strict')

const seriesDb = require('../src/model/events/eventSeries.db')
const series = require('../src/model/events/eventSeries.model')
const db = require('../src/utils/db')

after(() => db.close())

let store
const original = { ...seriesDb }

beforeEach(() => {
  store = { rows: new Map(), nextId: 1 }
  Object.assign(seriesDb, {
    list: async () => [...store.rows.values()].sort((a, b) => a.ordering - b.ordering || a.id - b.id),
    getById: async (id) => store.rows.get(id) || null,
    exists: async (id) => store.rows.has(id),
    insert: async (s) => {
      const id = store.nextId++
      store.rows.set(id, { ...s, id, definition_count: 0 })
      return id
    },
    update: async (id, s) => {
      const existing = store.rows.get(id)
      store.rows.set(id, { ...existing, ...s })
      return 1
    },
    remove: async (id) => {
      store.rows.delete(id)
      return 1
    },
  })
})

afterEach(() => Object.assign(seriesDb, original))

test('a series is created with a slug derived from its name', async () => {
  const result = await series.create({ name: 'Royal Spy Mission', ordering: 2 }, 7)
  assert.equal(result.ok, true)
  assert.equal(result.status, 201)
  assert.equal(result.series.slug, 'royal-spy-mission')
  assert.equal(result.series.ordering, 2)
  assert.equal(result.series.created_by, 7)
})

test('two series with the same name get distinct slugs', async () => {
  // `slug` is UNIQUE in the schema, so without this the second create is a 1452
  // reaching a controller as a 500.
  const first = await series.create({ name: 'Winter Arc' })
  const second = await series.create({ name: 'Winter Arc' })
  assert.equal(first.series.slug, 'winter-arc')
  assert.equal(second.series.slug, 'winter-arc-2')
})

test('renaming a series does NOT move its slug', async () => {
  // The rule with teeth. The arc page lives at the slug, and a rename is the
  // ordinary act of an editor tidying up wording months later.
  const created = await series.create({ name: 'Royal Spy Mission' })
  const updated = await series.update(created.series.id, { name: 'The Royal Spy Missions' })
  assert.equal(updated.ok, true)
  assert.equal(updated.series.name, 'The Royal Spy Missions')
  assert.equal(updated.series.slug, 'royal-spy-mission')
})

test('a nameless series is refused, and so is a nonsense ordering', async () => {
  assert.deepEqual((await series.create({ name: '   ' })).errors, ['name is required'])
  const bad = await series.create({ name: 'Fine', ordering: -3 })
  assert.equal(bad.ok, false)
  assert.match(bad.errors.join(' '), /ordering must be an integer/)
})

test('deleting a series answers with how many definitions it detached', async () => {
  // The whole consequence of this delete is about the rows it does NOT delete,
  // so the count is the answer rather than a detail.
  const created = await series.create({ name: 'Winter Arc' })
  store.rows.get(created.series.id).definition_count = 3

  const removed = await series.remove(created.series.id)
  assert.equal(removed.ok, true)
  assert.equal(removed.detached, 3)
  assert.equal(await seriesDb.getById(created.series.id), null)
})

test('acting on a series that is not there is a 404, never a 500', async () => {
  assert.equal((await series.update(999, { name: 'x' })).status, 404)
  assert.equal((await series.remove(999)).status, 404)
})

test('ordering places a series among the others, and defaults to zero', async () => {
  await series.create({ name: 'Third', ordering: 30 })
  await series.create({ name: 'First', ordering: 10 })
  await series.create({ name: 'Unordered' })
  const listed = await series.list()
  assert.deepEqual(listed.map((s) => s.name), ['Unordered', 'First', 'Third'])
})