// ── The bot's half of the Team notifications bridge (TEAMS.md §7.2) ────────
//
// Nothing here talks to Discord. `channel` is a fake that records what was sent,
// and the assertions are about the three things this side genuinely owns:
//
//   1. **the channel comes from the app and is never looked up.** `newsAnnounce`
//      reads guild_config because there is one #news; a Team's destination is
//      per-Team configuration, and a bot that resolved it would hold a second
//      copy of a table it cannot see the inputs to;
//   2. **a channel the bot cannot post to fails loudly rather than silently.** A
//      caller that is one-shot and best-effort only logs the difference, but an
//      operator debugging a quiet channel needs the bot's log to distinguish
//      "not connected" from "that id is not a text channel";
//   3. **Discord's own limits are enforced here.** An embed that exceeds them is
//      rejected WHOLESALE, so a long forum body must be truncated on this side
//      even though the app already excerpted it — the app's limit is a product
//      decision and this one is a protocol constraint.

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

const teamNotify = require('../src/discord/teamNotify')

// A fake channel that records what it was sent. `isTextBased` is the one method
// the code branches on, so it is the one worth making configurable.
function fakeChannel({ textBased = true } = {}) {
  const sends = []
  return {
    sends,
    isTextBased: () => textBased,
    send: async (payload) => { sends.push(payload); return { id: 'm1' } },
  }
}

function fakeClient(channel, { throws = false } = {}) {
  return {
    channels: {
      fetch: async (id) => {
        if (throws) throw new Error('Unknown Channel')
        return id === 'chan-1' ? channel : null
      },
    },
  }
}

const post = (client, over = {}) => teamNotify.postTeamNotification(client, {
  channelId: 'chan-1',
  stream: 'team.forum.post',
  teamName: 'Blackthorn’s Legion',
  teamUrl: 'https://site/guilds/blackthorns-legion',
  title: 'Siege tonight',
  body: 'Meet at the moongate.',
  url: 'https://site/guilds/blackthorns-legion?thread=41',
  ...over,
})

// ── 1. The channel is the app's decision ───────────────────────────────────

test('the message goes to the channel the app named', async () => {
  const channel = fakeChannel()
  await post(fakeClient(channel))
  assert.equal(channel.sends.length, 1)
  const [embed] = channel.sends[0].embeds
  assert.equal(embed.data.title, 'Siege tonight')
  assert.equal(embed.data.author.name, 'Blackthorn’s Legion')
  assert.equal(embed.data.url, 'https://site/guilds/blackthorns-legion?thread=41')
})

test('no channel id at all is refused before anything is fetched', async () => {
  await assert.rejects(() => post(fakeClient(fakeChannel()), { channelId: '' }), /No channel id/)
})

// ── 2. A channel the bot cannot use ────────────────────────────────────────

test('a channel the bot cannot see is a clear error, not a silent no-op', async () => {
  await assert.rejects(() => post(fakeClient(null)), /missing, not text-based, or not visible/)
})

test('a fetch that throws is reported the same way — the bot does not distinguish gone from hidden', async () => {
  await assert.rejects(() => post(fakeClient(fakeChannel(), { throws: true })), /missing, not text-based/)
})

test('a voice channel is refused', async () => {
  await assert.rejects(() => post(fakeClient(fakeChannel({ textBased: false }))), /not text-based/)
})

// ── 3. Discord's limits, and the heading ───────────────────────────────────

test('an over-long title is truncated rather than rejected by Discord as a whole', async () => {
  const channel = fakeChannel()
  await post(fakeClient(channel), { title: 'y'.repeat(400) })
  const [embed] = channel.sends[0].embeds
  assert.equal(embed.data.title.length, teamNotify.TITLE_MAX)
  assert.ok(embed.data.title.endsWith('…'))
})

test('an over-long body is truncated to the description limit', async () => {
  const channel = fakeChannel()
  await post(fakeClient(channel), { body: 'z'.repeat(9000) })
  const [embed] = channel.sends[0].embeds
  assert.ok(embed.data.description.length <= teamNotify.DESCRIPTION_MAX + 32)
})

test('a titled event keeps its heading, so a post and an announcement stay distinguishable', async () => {
  const channel = fakeChannel()
  await post(fakeClient(channel), { stream: 'team.announcement' })
  const [embed] = channel.sends[0].embeds
  assert.match(embed.data.description, /^\*\*Announcement\*\*/)
  assert.match(embed.data.description, /Meet at the moongate\./)
})

test('a roster event has no title, so the heading becomes the title', async () => {
  const channel = fakeChannel()
  await post(fakeClient(channel), { stream: 'team.member.joined', title: null, body: '3 new members joined.' })
  const [embed] = channel.sends[0].embeds
  assert.equal(embed.data.title, 'New member')
  assert.equal(embed.data.description, '3 new members joined.', 'no heading prefix when the title already is one')
})

test('an unknown stream still posts, under a neutral heading', async () => {
  const channel = fakeChannel()
  await post(fakeClient(channel), { stream: 'team.something.new', title: null })
  const [embed] = channel.sends[0].embeds
  assert.equal(embed.data.title, 'Team update')
})

test('a missing team name does not produce an embed with an empty author line', async () => {
  const channel = fakeChannel()
  await post(fakeClient(channel), { teamName: '', teamUrl: null })
  const [embed] = channel.sends[0].embeds
  assert.equal(embed.data.author.name, 'A team')
  assert.equal(embed.data.author.url, undefined)
})

test('clamp treats whitespace-only as absent, which is what keeps an empty description off the embed', async () => {
  assert.equal(teamNotify.clamp('   ', 100), null)
  assert.equal(teamNotify.clamp('ok', 100), 'ok')
})