import {
  buildRealtimeSessionConfig,
  DEFAULT_VOICE,
  MAX_INSTRUCTIONS_LENGTH,
  resolveRealtimeModel,
} from './policy.ts'

function assertEquals(actual: unknown, expected: unknown, message: string): void {
  const a = JSON.stringify(actual)
  const e = JSON.stringify(expected)
  if (a !== e) throw new Error(`${message}: expected ${e}, got ${a}`)
}

Deno.test('resolveRealtimeModel applies tier defaults and allow-lists', () => {
  assertEquals(resolveRealtimeModel('pro', undefined), { allowed: true, model: 'gpt-realtime-2.1-mini' }, 'pro default')
  assertEquals(resolveRealtimeModel('pro_plus', undefined), { allowed: true, model: 'gpt-realtime-2.1' }, 'pro+ default')
  assertEquals(
    resolveRealtimeModel('team', 'gpt-realtime-2.1-mini'),
    { allowed: true, model: 'gpt-realtime-2.1-mini' },
    'team explicit mini',
  )
  assertEquals(resolveRealtimeModel('free', undefined), {
    allowed: false,
    error: 'tier_not_allowed',
    requested: null,
    allowedModels: [],
  }, 'free blocked')
  assertEquals(resolveRealtimeModel('pro', 'gpt-realtime-2.1'), {
    allowed: false,
    error: 'model_not_allowed',
    requested: 'gpt-realtime-2.1',
    allowedModels: ['gpt-realtime-2.1-mini'],
  }, 'pro cannot pick full model')
})

Deno.test('buildRealtimeSessionConfig clamps instructions and defaults voice', () => {
  const long = 'x'.repeat(MAX_INSTRUCTIONS_LENGTH + 50)
  const config = buildRealtimeSessionConfig({ instructions: long }, 'gpt-realtime-2.1-mini')
  assertEquals(config.instructions?.length, MAX_INSTRUCTIONS_LENGTH, 'instructions clamped')
  assertEquals(config.audio.output.voice, DEFAULT_VOICE, 'default voice')

  assertEquals(
    buildRealtimeSessionConfig({ voice: 'cedar', instructions: '' }, 'm'),
    { type: 'realtime', model: 'm', audio: { output: { voice: 'cedar' } } },
    'empty instructions omitted',
  )
  assertEquals(
    buildRealtimeSessionConfig({ voice: 42, instructions: 7 }, 'm'),
    { type: 'realtime', model: 'm', audio: { output: { voice: DEFAULT_VOICE } } },
    'non-string fields ignored',
  )
})