// ── The bot's half of module slash commands (TEAMS.md §7.1) ────────────────
//
// The first tests in this package, and they exist for a specific reason: phases
// 8 and 9 put more of the Discord integration in this process, and the failure
// modes here are ones no unit test in `server/` can see — a whole-set PUT that
// one bad entry poisons, a deferral that has to happen before anything slow, and
// a reply that must be EDITED rather than sent once the interaction is deferred.
//
// Nothing here talks to Discord. `interaction` is a fake that records what was
// called on it, which is the whole of what this file is asserting about.

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

const dynamic = require('../src/discord/dynamicCommands')
const appInternal = require('../src/site/appInternalClient')
const staticCommands = require('../src/discord/commands')

const originals = {
  fetchCommands: appInternal.fetchCommands,
  dispatchCommand: appInternal.dispatchCommand,
  get: staticCommands.get,
}

beforeEach(() => {
  dynamic._reset()
  Object.assign(appInternal, originals)
  staticCommands.get = originals.get
})

const definition = (over = {}) => ({
  name: 'guild',
  description: 'Show a guild',
  owner: 'uo',
  access: 'everyone',
  options: [{ name: 'name', type: 'string', description: 'Guild name', required: false }],
  ...over,
})

const answers = (commands, version = 1) => {
  appInternal.fetchCommands = async () => ({ ok: true, data: { version, commands } })
}

function fakeInteraction({ commandName = 'guild', options = {}, userId = '555' } = {}) {
  const calls = []
  return {
    calls,
    commandName,
    guildId: '999',
    user: { id: userId },
    options: {
      get: (name) => (name in options ? { value: options[name] } : null),
    },
    deferReply: async (payload) => calls.push(['defer', payload]),
    editReply: async (payload) => calls.push(['edit', payload]),
    followUp: async (payload) => calls.push(['followUp', payload]),
  }
}

// ── Pulling ────────────────────────────────────────────────────────────────

test('a pull reports whether the set moved, so a nudge is cheap', async () => {
  answers([definition()], 7)
  assert.deepEqual(await dynamic.pull(), { ok: true, changed: true, count: 1 })
  // Same version, same size: nothing to re-register, and re-registering anyway
  // would mean a REST.put per module state change instead of per real change.
  assert.deepEqual(await dynamic.pull(), { ok: true, changed: false, count: 1 })
  answers([definition()], 8)
  assert.equal((await dynamic.pull()).changed, true)
})

// Otherwise a restart blip would deregister every module command from Discord
// and re-register it a minute later, with members watching it happen.
test('a failed pull keeps the set already registered', async () => {
  answers([definition()])
  await dynamic.pull()
  appInternal.fetchCommands = async () => ({ ok: false, error: 'ECONNREFUSED' })
  assert.deepEqual(await dynamic.pull(), { ok: false, changed: false, count: 1 })
  assert.equal(dynamic.definitions().length, 1)
})

// The collision the app cannot see: it validates against what IT registered and
// does not know the bot's own array exists. Two entries of one name in a single
// PUT is rejected as a batch, taking the built-ins down with it.
test('a module command that collides with a built-in is dropped, not registered', async () => {
  staticCommands.get = (name) => (name === 'ping' ? { data: { name: 'ping' } } : undefined)
  answers([definition({ name: 'ping' }), definition()])
  await dynamic.pull()
  assert.deepEqual(dynamic.definitions().map((d) => d.name), ['guild'])
  assert.equal(dynamic.has('ping'), false)
})

test('definitions carry Discord’s numeric option types, not the contract’s names', async () => {
  answers([definition({
    options: [
      { name: 'who', type: 'user', description: 'A member', required: true },
      { name: 'n', type: 'integer', description: 'How many', choices: [{ name: 'one', value: 1 }] },
    ],
  })])
  await dynamic.pull()
  const [data] = dynamic.definitions()
  assert.deepEqual(data.options.map((o) => o.type), [6, 4])
  assert.deepEqual(data.options[1].choices, [{ name: 'one', value: 1 }])
  assert.equal(data.default_member_permissions, undefined)
})

// `linked` has no Discord equivalent — there is no "has a website account"
// predicate — so only `staff` maps, and the app re-checks both regardless.
test('only access: staff becomes a Discord permission default', async () => {
  answers([definition({ access: 'staff' }), definition({ name: 'other', access: 'linked' })])
  await dynamic.pull()
  const [staff, linked] = dynamic.definitions()
  assert.equal(typeof staff.default_member_permissions, 'string')
  assert.equal(linked.default_member_permissions, undefined)
})

// ── Executing ──────────────────────────────────────────────────────────────

test('the deferral happens before the dispatch, always', async () => {
  answers([definition()])
  await dynamic.pull()
  let deferredFirst = false
  const interaction = fakeInteraction()
  appInternal.dispatchCommand = async () => {
    deferredFirst = interaction.calls.length === 1 && interaction.calls[0][0] === 'defer'
    return { ok: true, data: { ok: true, response: { text: 'hi' } } }
  }
  await dynamic.execute(interaction)
  assert.ok(deferredFirst, 'the website is never in Discord’s 3-second ack path')
  assert.deepEqual(interaction.calls.at(-1), ['edit', { content: 'hi' }])
})

test('the options the member supplied are passed by name, as plain values', async () => {
  answers([definition({
    options: [
      { name: 'name', type: 'string', description: 'd' },
      { name: 'who', type: 'user', description: 'd' },
      { name: 'missing', type: 'string', description: 'd' },
    ],
  })])
  await dynamic.pull()
  let sent = null
  appInternal.dispatchCommand = async (body) => {
    sent = body
    return { ok: true, data: { ok: true, response: {} } }
  }
  await dynamic.execute(fakeInteraction({ options: { name: 'KOC', who: '42' } }))
  assert.deepEqual(sent.options, { name: 'KOC', who: '42' })
  assert.equal(sent.platformUserId, '555')
  assert.equal(sent.guildId, '999')
})

test('a title or fields render as an embed; a bare text does not', async () => {
  answers([definition()])
  await dynamic.pull()
  appInternal.dispatchCommand = async () => ({
    ok: true,
    data: { ok: true, response: { title: 'Knights', text: 'Alliance: Accord', fields: [{ name: 'Members', value: '12' }], url: 'https://site.test/uo/guilds/7' } },
  })
  const interaction = fakeInteraction()
  await dynamic.execute(interaction)
  const [, payload] = interaction.calls.at(-1)
  assert.equal(payload.embeds[0].title, 'Knights')
  assert.equal(payload.embeds[0].description, 'Alliance: Accord')
  assert.equal(payload.embeds[0].url, 'https://site.test/uo/guilds/7')
})

// §9 answer 5: the public projection, plus a private nudge to link. One reply
// cannot be both, so the aside is a follow-up — which is the bot's decision to
// make, not the handler's.
test('a notice becomes an ephemeral follow-up beside a public answer', async () => {
  answers([definition()])
  await dynamic.pull()
  appInternal.dispatchCommand = async () => ({
    ok: true,
    data: { ok: true, response: { text: 'public', notice: 'Link your account' } },
  })
  const interaction = fakeInteraction()
  await dynamic.execute(interaction)
  assert.deepEqual(interaction.calls.at(-1), ['followUp', { content: 'Link your account', ephemeral: true }])
})

test('a notice is not repeated when the answer was already private', async () => {
  answers([definition({ access: 'linked' })])
  await dynamic.pull()
  appInternal.dispatchCommand = async () => ({
    ok: true,
    data: { ok: true, response: { text: 'private', notice: 'Link your account' } },
  })
  const interaction = fakeInteraction()
  await dynamic.execute(interaction)
  assert.deepEqual(interaction.calls[0], ['defer', { ephemeral: true }])
  assert.equal(interaction.calls.some(([kind]) => kind === 'followUp'), false)
})

// Every failure path EDITS. Replying to a deferred interaction throws, so a
// refusal that used reply() would turn a clean "no" into an unhandled error.
test('a refusal is phrased by the bot and edited into the deferred reply', async () => {
  answers([definition({ access: 'linked' })])
  await dynamic.pull()
  appInternal.dispatchCommand = async () => ({
    ok: true, data: { ok: false, reason: 'forbidden', access: 'linked', isLinked: false },
  })
  const interaction = fakeInteraction()
  await dynamic.execute(interaction)
  assert.match(interaction.calls.at(-1)[1].content, /Link your Discord account/)
  assert.equal(interaction.calls.filter(([kind]) => kind === 'edit').length, 1)
})

test('an unreachable app is the same sentence to the member and a different line in the log', async () => {
  answers([definition()])
  await dynamic.pull()
  appInternal.dispatchCommand = async () => ({ ok: false, error: 'timeout' })
  const interaction = fakeInteraction()
  await dynamic.execute(interaction)
  assert.match(interaction.calls.at(-1)[1].content, /Something went wrong/)
})

test('an interaction for a command the app no longer serves is left alone', async () => {
  answers([definition()])
  await dynamic.pull()
  const interaction = fakeInteraction({ commandName: 'gone' })
  assert.equal(await dynamic.execute(interaction), false)
  assert.deepEqual(interaction.calls, [], 'nothing is deferred for a command that is not ours')
})