import { test } from 'node:test';
import assert from 'node:assert/strict';
import fs from 'node:fs';
import os from 'node:os';
import path from 'node:path';
import type { ChatMessage } from '#shared/events.ts';
import { migrate } from './index.ts';
import { repos } from './repos.ts';
import { DatabaseSync } from 'node:sqlite';

function freshDb() {
  const dir = fs.mkdtempSync(path.join(os.tmpdir(), 'abdulive-test-'));
  const db = new DatabaseSync(path.join(dir, 't.db'));
  db.exec('PRAGMA foreign_keys = ON');
  migrate(db);
  return { db, repo: repos(db), dir };
}

function msg(over: Partial<ChatMessage> = {}): ChatMessage {
  return {
    id: `m-${Math.random().toString(36).slice(2)}`,
    ts: '2026-09-09T20:00:00.000Z',
    userId: '42', login: 'maxi_2k', displayName: 'maxi_2k',
    text: 'moin', emotes: [], isFirst: false, isReturning: false,
    isCommand: false, isMod: false, isSub: false, isBroadcaster: false,
    bits: 0, color: null, ...over,
  };
}

test('legt Nutzer an und zaehlt Nachrichten', () => {
  const { db, repo } = freshDb();
  repo.openStream('s1', '2026-09-09T19:00:00.000Z');
  repo.recordMessage(msg(), 's1');
  repo.recordMessage(msg({ text: 'zweite' }), 's1');

  const user = db.prepare('SELECT * FROM users WHERE id = ?').get('42') as
    { message_count: number; login: string; first_seen_at: string };
  assert.equal(user.message_count, 2);
  assert.equal(user.login, 'maxi_2k');
  const n = db.prepare('SELECT COUNT(*) AS n FROM chat_messages').get() as { n: number };
  assert.equal(n.n, 2);
});

test('Namenswechsel erhaelt die Historie', () => {
  const { db, repo } = freshDb();
  repo.openStream('s1', '2026-09-09T19:00:00.000Z');
  repo.recordMessage(msg(), 's1');
  // Gleiche user-id, neuer Login - so sieht eine Twitch-Namensaenderung aus
  repo.recordMessage(msg({ login: 'maxi_neu', displayName: 'Maxi_Neu' }), 's1');

  const rows = db.prepare('SELECT * FROM users').all() as Array<{ login: string; message_count: number }>;
  assert.equal(rows.length, 1, 'darf keinen zweiten Nutzer angelegt haben');
  assert.equal(rows[0]!.login, 'maxi_neu');
  assert.equal(rows[0]!.message_count, 2);
});

test('zaehlt Streams, an denen jemand geschrieben hat', () => {
  const { repo } = freshDb();
  repo.openStream('s1', '2026-09-09T19:00:00.000Z');
  repo.openStream('s2', '2026-09-10T19:00:00.000Z');
  assert.equal(repo.recordMessage(msg(), 's1').streamsChatted, 1);
  assert.equal(repo.recordMessage(msg(), 's1').streamsChatted, 1);
  assert.equal(repo.recordMessage(msg(), 's2').streamsChatted, 2);
});

test('doppelte Nachrichten-IDs werden nicht zweimal gespeichert', () => {
  const { db, repo } = freshDb();
  repo.openStream('s1', '2026-09-09T19:00:00.000Z');
  const m = msg({ id: 'immer-gleich' });
  repo.recordMessage(m, 's1');
  repo.recordMessage(m, 's1');
  const n = db.prepare('SELECT COUNT(*) AS n FROM chat_messages').get() as { n: number };
  assert.equal(n.n, 1);
});

test('Zuschauerzahlen setzen den Hoechststand', () => {
  const { repo } = freshDb();
  repo.openStream('s1', '2026-09-09T19:00:00.000Z');
  repo.sample('s1', '2026-09-09T19:01:00.000Z', 8);
  repo.sample('s1', '2026-09-09T19:02:00.000Z', 17);
  repo.sample('s1', '2026-09-09T19:03:00.000Z', 11);
  assert.equal(repo.getStream('s1')?.peak_viewers, 17);
});

test('offene Sitzung wird gefunden und geschlossen', () => {
  const { repo } = freshDb();
  repo.openStream('s1', '2026-09-09T19:00:00.000Z');
  assert.equal(repo.latestOpenStream()?.id, 's1');
  repo.closeStream('s1', '2026-09-09T22:00:00.000Z');
  assert.equal(repo.latestOpenStream(), undefined);
});

test('erneutes openStream ueberschreibt eine laufende Sitzung nicht', () => {
  const { repo } = freshDb();
  repo.openStream('s1', '2026-09-09T19:00:00.000Z');
  repo.openStream('s1', '2026-09-09T21:00:00.000Z');
  assert.equal(repo.getStream('s1')?.started_at, '2026-09-09T19:00:00.000Z');
});

test('Nachrichten ohne laufenden Stream gehen trotzdem nicht verloren', () => {
  const { db, repo } = freshDb();
  repo.recordMessage(msg(), null);
  const row = db.prepare('SELECT stream_id FROM chat_messages').get() as { stream_id: string | null };
  assert.equal(row.stream_id, null);
});

test('unique_chatters zaehlt Personen, nicht Nachrichten', () => {
  const { repo } = freshDb();
  repo.openStream('s1', '2026-09-09T19:00:00.000Z');
  repo.recordMessage(msg({ userId: '1', login: 'a' }), 's1');
  repo.recordMessage(msg({ userId: '1', login: 'a' }), 's1');
  repo.recordMessage(msg({ userId: '2', login: 'b' }), 's1');
  assert.equal(repo.getStream('s1')?.unique_chatters, 2);
});