// Mock rate limits for testing [internal-only]
// The external build keeps this module as a stable no-op surface so imports
// remain valid without exposing internal-only rate-limit simulation behavior.

import { setMockBillingAccessOverride } from '../utils/billing.js'
import type { OverageDisabledReason } from './claudeAiLimits.js'

type SubscriptionType = string

type MockHeaders = {
  'anthropic-ratelimit-unified-status'?:
    | 'allowed'
    | 'allowed_warning'
    | 'rejected'
  'anthropic-ratelimit-unified-reset'?: string
  'anthropic-ratelimit-unified-representative-claim'?:
    | 'five_hour'
    | 'seven_day'
    | 'seven_day_opus'
    | 'seven_day_sonnet'
  'anthropic-ratelimit-unified-overage-status'?:
    | 'allowed'
    | 'allowed_warning'
    | 'rejected'
  'anthropic-ratelimit-unified-overage-reset'?: string
  'anthropic-ratelimit-unified-overage-disabled-reason'?: OverageDisabledReason
  'anthropic-ratelimit-unified-fallback'?: 'available'
  'anthropic-ratelimit-unified-fallback-percentage'?: string
  'retry-after'?: string
  'anthropic-ratelimit-unified-5h-utilization'?: string
  'anthropic-ratelimit-unified-5h-reset'?: string
  'anthropic-ratelimit-unified-5h-surpassed-threshold'?: string
  'anthropic-ratelimit-unified-7d-utilization'?: string
  'anthropic-ratelimit-unified-7d-reset'?: string
  'anthropic-ratelimit-unified-7d-surpassed-threshold'?: string
  'anthropic-ratelimit-unified-overage-utilization'?: string
  'anthropic-ratelimit-unified-overage-surpassed-threshold'?: string
}

export type MockHeaderKey =
  | 'status'
  | 'reset'
  | 'claim'
  | 'overage-status'
  | 'overage-reset'
  | 'overage-disabled-reason'
  | 'fallback'
  | 'fallback-percentage'
  | 'retry-after'
  | '5h-utilization'
  | '5h-reset'
  | '5h-surpassed-threshold'
  | '7d-utilization'
  | '7d-reset'
  | '7d-surpassed-threshold'

export type MockScenario =
  | 'normal'
  | 'session-limit-reached'
  | 'approaching-weekly-limit'
  | 'weekly-limit-reached'
  | 'overage-active'
  | 'overage-warning'
  | 'overage-exhausted'
  | 'out-of-credits'
  | 'org-zero-credit-limit'
  | 'org-spend-cap-hit'
  | 'member-zero-credit-limit'
  | 'seat-tier-zero-credit-limit'
  | 'opus-limit'
  | 'opus-warning'
  | 'sonnet-limit'
  | 'sonnet-warning'
  | 'fast-mode-limit'
  | 'fast-mode-short-limit'
  | 'extra-usage-required'
  | 'clear'

export function setMockHeader(
  _key: MockHeaderKey,
  _value: string | undefined,
): void {}

export function addExceededLimit(
  _type: 'five_hour' | 'seven_day' | 'seven_day_opus' | 'seven_day_sonnet',
  _hoursFromNow: number,
): void {}

export function setMockEarlyWarning(
  _claimAbbrev: '5h' | '7d' | 'overage',
  _utilization: number,
  _hoursFromNow?: number,
): void {}

export function clearMockEarlyWarning(): void {}

export function setMockRateLimitScenario(_scenario: MockScenario): void {}

export function getMockHeaderless429Message(): string | null {
  return null
}

export function getMockHeaders(): MockHeaders | null {
  return null
}

export function getMockStatus(): string {
  return 'No mock headers active (using real limits)'
}

export function clearMockHeaders(): void {
  setMockBillingAccessOverride(null)
}

export function applyMockHeaders(
  headers: globalThis.Headers,
): globalThis.Headers {
  return headers
}

export function shouldProcessMockLimits(): boolean {
  return false
}

export function getCurrentMockScenario(): MockScenario | null {
  return null
}

export function getScenarioDescription(scenario: MockScenario): string {
  switch (scenario) {
    case 'normal':
      return 'Normal usage, no limits'
    case 'session-limit-reached':
      return 'Session rate limit exceeded'
    case 'approaching-weekly-limit':
      return 'Approaching weekly aggregate limit'
    case 'weekly-limit-reached':
      return 'Weekly aggregate limit exceeded'
    case 'overage-active':
      return 'Using extra usage (overage active)'
    case 'overage-warning':
      return 'Approaching extra usage limit'
    case 'overage-exhausted':
      return 'Both subscription and extra usage limits exhausted'
    case 'out-of-credits':
      return 'Out of extra usage credits (wallet empty)'
    case 'org-zero-credit-limit':
      return 'Org spend cap is zero (no extra usage budget)'
    case 'org-spend-cap-hit':
      return 'Org spend cap hit for the month'
    case 'member-zero-credit-limit':
      return 'Member limit is zero (admin can allocate more)'
    case 'seat-tier-zero-credit-limit':
      return 'Seat tier limit is zero (admin can allocate more)'
    case 'opus-limit':
      return 'Opus limit reached'
    case 'opus-warning':
      return 'Approaching Opus limit'
    case 'sonnet-limit':
      return 'Sonnet limit reached'
    case 'sonnet-warning':
      return 'Approaching Sonnet limit'
    case 'fast-mode-limit':
      return 'Fast mode rate limit'
    case 'fast-mode-short-limit':
      return 'Fast mode rate limit (short)'
    case 'extra-usage-required':
      return 'Headerless 429: Extra usage required for 1M context'
    case 'clear':
      return 'Clear mock headers (use real limits)'
    default:
      return 'Unknown scenario'
  }
}

export function setMockSubscriptionType(
  _subscriptionType: SubscriptionType | null,
): void {}

export function getMockSubscriptionType(): SubscriptionType | null {
  return null
}

export function shouldUseMockSubscription(): boolean {
  return false
}

export function setMockBillingAccess(_hasAccess: boolean | null): void {
  // External build: internal mock billing access overrides are disabled.
}

export function isMockFastModeRateLimitScenario(): boolean {
  return false
}

export function checkMockFastModeRateLimit(
  _isFastModeActive?: boolean,
): MockHeaders | null {
  return null
}