import { describe, it } from 'node:test';
import assert from 'node:assert/strict';
import { CALL_REJOIN_MAX_AGE_MS, decideRejoin, RejoinContext } from './callRejoin';

const base: RejoinContext = {
  record: {
    roomId: '!r',
    deviceId: 'DEV',
    joinedAt: 900_000,
    lastSeen: 1_000_000,
    microphone: true,
    video: false,
  },
  mode: 'ask',
  now: 1_060_000,
  myDeviceId: 'DEV',
  roomJoined: true,
  ownMemberDevices: [],
  memberCount: 2,
};

describe('decideRejoin', () => {
  it('asks by default when the call is still going', () => {
    assert.deepEqual(decideRejoin(base), { action: 'ask', roomId: '!r' });
    assert.deepEqual(decideRejoin({ ...base, mode: 'auto' }), { action: 'auto', roomId: '!r' });
  });

  it('does nothing when off, stale, another device, or no record', () => {
    assert.deepEqual(decideRejoin({ ...base, mode: 'off' }), { action: 'none' });
    assert.deepEqual(decideRejoin({ ...base, record: undefined }), { action: 'none' });
    assert.deepEqual(decideRejoin({ ...base, now: 1_000_000 + CALL_REJOIN_MAX_AGE_MS + 1 }), {
      action: 'none',
    });
    assert.deepEqual(decideRejoin({ ...base, myDeviceId: 'OTHER' }), { action: 'none' });
    assert.deepEqual(decideRejoin({ ...base, roomJoined: false }), { action: 'none' });
  });

  it('skips when we already rejoined from another device', () => {
    assert.deepEqual(decideRejoin({ ...base, ownMemberDevices: ['PHONE'], memberCount: 2 }), {
      action: 'none',
    });
  });

  it('skips when only our own stale membership is left', () => {
    assert.deepEqual(decideRejoin({ ...base, ownMemberDevices: ['DEV'], memberCount: 1 }), {
      action: 'none',
    });
    assert.deepEqual(decideRejoin({ ...base, ownMemberDevices: [], memberCount: 0 }), {
      action: 'none',
    });
    assert.deepEqual(decideRejoin({ ...base, ownMemberDevices: ['DEV'], memberCount: 2 }), {
      action: 'ask',
      roomId: '!r',
    });
  });
});