import test from 'node:test'
import assert from 'node:assert/strict'
import { existsSync, mkdtempSync } from 'node:fs'
import { tmpdir } from 'node:os'
import path from 'node:path'
import Database from 'better-sqlite3'
import { settingsStore } from '../src/settings.js'
import { suggestEngine } from '../src/suggest.js'

function makeYoutubarrDb(dir) {
  const p = path.join(dir, 'db.sqlite3')
  const db = new Database(p)
  db.exec(`
    CREATE TABLE youtubarr_playlist (id INTEGER PRIMARY KEY, playlist_id TEXT, title TEXT);
    CREATE TABLE youtubarr_trackitem (
      id INTEGER PRIMARY KEY, playlist_id INTEGER, title TEXT,
      artist_name_guess TEXT, blacklisted INTEGER DEFAULT 0
    );
    INSERT INTO youtubarr_playlist VALUES (1, 'PLC0x', 'lefu-Musick');
    INSERT INTO youtubarr_playlist VALUES (2, 'LM', 'Liked Music');
    INSERT INTO youtubarr_trackitem VALUES (1, 1, 'Amaranth', 'Nightwish', 0);
    INSERT INTO youtubarr_trackitem VALUES (2, 1, 'Svart', 'Hemligt Band', 1);
    INSERT INTO youtubarr_trackitem VALUES (3, 2, 'Gimme! Gimme! Gimme!', 'ABBA', 0);
  `)
  db.close()
  return p
}

function setup({ geminiResponse } = {}) {
  const dataDir = mkdtempSync(path.join(tmpdir(), 'lyssnarr-sug-'))
  const ytDir = mkdtempSync(path.join(tmpdir(), 'lyssnarr-ytdb-'))
  const store = settingsStore(dataDir)
  store.save({ gemini: { apiKey: 'g-nyckel' }, jellyfin: { apiKey: 'jf', userId: 'u1' } })
  const config = {
    dataDir,
    gemini: { apiKey: '', model: 'gemini-2.5-flash' },
    jellyfin: { url: 'http://jellyfin:8096', apiKey: '' },
    youtubarr: { dbPath: makeYoutubarrDb(ytDir), dataDir: ytDir },
  }
  const lidarr = {
    artists: async () => [{ artistName: 'Powerwolf' }],
    search: async () => [
      {
        artist: {
          foreignArtistId: 'mbid-x',
          artistName: 'Sabaton',
          images: [{ coverType: 'poster', remoteUrl: 'http://img/s.jpg' }],
        },
      },
    ],
  }
  const calls = []
  const fetchImpl = async (url, opts) => {
    calls.push(url)
    if (url.includes('generativelanguage')) {
      const body = JSON.parse(opts.body)
      fetchImpl.prompt = body.contents[0].parts[0].text
      return {
        ok: true,
        json: async () => ({
          candidates: [{ content: { parts: [{ text: geminiResponse ?? JSON.stringify([
            { type: 'artist', name: 'Sabaton', motivation: 'Powermetal som Powerwolf.' },
          ]) }] } }],
        }),
      }
    }
    if (url.includes('/Users/u1/Items')) {
      return { ok: true, json: async () => ({ Items: [{ Name: 'Zenit', Artists: ['1000mods'] }] }) }
    }
    throw new Error('oväntad url: ' + url)
  }
  const engine = suggestEngine({ config, store, lidarr, fetchImpl })
  return { engine, fetchImpl, dataDir }
}

test('run: samlar signaler, frågar Gemini, berikar och cachar på disk', async () => {
  const { engine, fetchImpl, dataDir } = setup()
  const batch = await engine.run('manuell')

  assert.match(fetchImpl.prompt, /Powerwolf/, 'biblioteket ska in i prompten')
  assert.match(fetchImpl.prompt, /1000mods – Zenit/, 'jellyfin-historiken ska in i prompten')
  assert.match(fetchImpl.prompt, /Nightwish – Amaranth \[lefu-Musick\]/, 'YT-tillägg ska in i prompten')
  assert.ok(!fetchImpl.prompt.includes('Hemligt Band'), 'svartlistade låtar ska inte med')

  assert.equal(batch.items.length, 1)
  const item = batch.items[0]
  assert.equal(item.name, 'Sabaton')
  assert.equal(item.mbid, 'mbid-x')
  assert.equal(item.poster, 'http://img/s.jpg')
  assert.equal(item.motivation, 'Powermetal som Powerwolf.')

  assert.ok(existsSync(path.join(dataDir, 'suggestions.json')))
  assert.equal(engine.latest(10).length, 1)
  assert.equal(engine.lastRun(), batch.createdAt)
})

test('run: batch-id räknas upp och latest tar nyaste först', async () => {
  const { engine } = setup()
  const b1 = await engine.run()
  const b2 = await engine.run()
  assert.equal(b2.id, b1.id + 1)
  assert.equal(engine.loadBatches().length, 2)
  assert.equal(engine.loadBatches()[0].id, b2.id)
})

test('run: markdown-staket runt JSON hanteras', async () => {
  const { engine } = setup({
    geminiResponse: '```json\n[{"type":"artist","name":"Ghost","motivation":"x"}]\n```',
  })
  const batch = await engine.run()
  assert.equal(batch.items[0].name, 'Ghost')
})

test('run(tracks): gillade + mest spelade in i prompten, egen batch-typ', async () => {
  const { engine, fetchImpl } = setup({
    geminiResponse: JSON.stringify([
      { name: 'Dancing Queen', artist: 'ABBA', motivation: 'Klassiker.' },
    ]),
  })
  const batch = await engine.run('manuell', 'tracks')

  assert.match(fetchImpl.prompt, /ENSKILDA LÅTAR/)
  assert.match(fetchImpl.prompt, /ABBA – Gimme! Gimme! Gimme!/, 'Liked Music-låtar ska in')
  assert.match(fetchImpl.prompt, /1000mods – Zenit/, 'mest spelade ska in')

  assert.equal(batch.type, 'tracks')
  assert.equal(batch.items[0].kind, 'track')
  assert.equal(batch.items[0].secondary, 'ABBA')
  assert.equal(batch.items[0].artistMbid, 'mbid-x', 'artist-mbid berikas för Hämta')

  assert.equal(engine.latest(10, 'tracks').length, 1)
  assert.equal(engine.latest(10, 'mix').length, 0, 'låt-batcher ska inte blandas in i mixen')
  assert.equal(engine.lastRun('tracks'), batch.createdAt)
  assert.equal(engine.lastRun('mix'), null)
})

test('run(genres): artister i prompt, filtrering mot bibliotek + gillat', async () => {
  const { engine, fetchImpl } = setup({
    geminiResponse: JSON.stringify([
      {
        name: 'Symphonic metal',
        motivation: 'Storslaget och episkt.',
        topArtists: ['Powerwolf', 'Epica'],
        topTracks: [
          { name: 'Gimme! Gimme! Gimme!', artist: 'ABBA' },
          { name: 'Storm', artist: 'Floor Jansen' },
        ],
      },
    ]),
  })
  const batch = await engine.run('manuell', 'genres')

  assert.match(fetchImpl.prompt, /GENRER/)
  assert.match(fetchImpl.prompt, /ABBA/, 'artister ur gillat ska in i prompten')
  assert.match(fetchImpl.prompt, /1000mods/, 'artister ur spelat ska in i prompten')

  assert.equal(batch.type, 'genres')
  const g = batch.items[0]
  assert.equal(g.kind, 'genre')
  assert.equal(g.topTracks.length, 1, 'gillad låt (Gimme! Gimme! Gimme!) ska filtreras bort')
  assert.equal(g.topTracks[0].name, 'Storm')
  assert.deepEqual(
    g.topArtists.map((a) => a.name),
    ['Epica'],
    'Powerwolf finns i biblioteket och ska filtreras bort',
  )
  assert.equal(g.topArtists[0].mbid, 'mbid-x')
  assert.equal(g.topArtists[0].kind, 'artist', 'toppartister ska vara färdiga kort')
  assert.equal(g.topTracks[0].kind, 'track')
  assert.equal(g.topTracks[0].artistMbid, 'mbid-x', 'låtar i genren berikas med artist-mbid')
  assert.equal(g.topTracks[0].poster, 'http://img/s.jpg', 'låtar i genren får omslag')
  assert.equal(g.poster, 'http://img/s.jpg', 'genrekortet lånar första toppartistens omslag')
})

test('run utan Gemini-nyckel ger begripligt fel', async () => {
  const { engine, dataDir } = setup()
  const store = settingsStore(dataDir)
  store.save({ gemini: { apiKey: '' } })
  await assert.rejects(() => engine.run(), /Gemini-nyckel saknas/)
})