/**
 * Minimal, dependency-free HTTP helpers for talking to the backend directly
 * (bypassing the browser) during E2E setup and ground-truth assertions.
 *
 * Deliberately hits the backend at 127.0.0.1:8000, not through the Vite
 * proxy: these calls run in plain Node (global-setup) or alongside a
 * Playwright test (spec files), never inside a browser page, so there is no
 * CORS concern and no need for the proxy or the httpOnly refresh cookie —
 * just a Bearer access token obtained via `apiLogin`.
 */

export const API_BASE = 'http://127.0.0.1:8000'

// Seeded by `backend/scripts/seed_demo.py` — see that file's module
// docstring. Not a secret: dev-only, fixed, printed by the script itself.
export const DEMO_EMAIL = 'demo@example.com'
export const DEMO_PASSWORD = 'DemoPass123!'

export async function waitForBackendHealth(timeoutMs = 60_000): Promise<void> {
  const healthUrl = `${API_BASE}/health`
  const deadline = Date.now() + timeoutMs
  let lastError: unknown = null
  while (Date.now() < deadline) {
    try {
      const res = await fetch(healthUrl)
      if (res.ok) return
    } catch (err) {
      lastError = err
    }
    await new Promise((resolve) => setTimeout(resolve, 500))
  }
  throw new Error(`Backend never reported healthy at ${healthUrl}: ${String(lastError)}`)
}

async function parseJsonOrThrow<T>(res: Response, what: string): Promise<T> {
  if (!res.ok) {
    throw new Error(`${what} failed: ${res.status} ${await res.text()}`)
  }
  return (await res.json()) as T
}

interface LoginResponse {
  access_token: string
}

export async function apiLogin(email: string, password: string): Promise<string> {
  const res = await fetch(`${API_BASE}/api/auth/login`, {
    method: 'POST',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify({ email, password }),
  })
  const data = await parseJsonOrThrow<LoginResponse>(res, 'login')
  return data.access_token
}

export interface ApiChild {
  id: string
  name: string
  birth_date: string
}

export interface ApiUserContext {
  personal_data_uuid: string
  workspace_id: string
  parent_name: string
  children: ApiChild[]
}

export async function apiGetContext(token: string): Promise<ApiUserContext> {
  const res = await fetch(`${API_BASE}/api/auth/context`, {
    headers: { Authorization: `Bearer ${token}` },
  })
  return parseJsonOrThrow<ApiUserContext>(res, 'get user context')
}

export type PlannedDayType = 'sjukpenning' | 'lagsta' | 'vacation'

export interface PlannedDayPayload {
  workspace_id: string
  child_id: string
  parent_personal_data_uuid: string
  date: string
  day_type: PlannedDayType
  is_dubbeldag: boolean
}

export async function apiCreatePlannedDay(token: string, payload: PlannedDayPayload): Promise<void> {
  const res = await fetch(`${API_BASE}/api/planned-days`, {
    method: 'POST',
    headers: { 'Content-Type': 'application/json', Authorization: `Bearer ${token}` },
    body: JSON.stringify(payload),
  })
  if (!res.ok) {
    throw new Error(`create planned day ${payload.date} failed: ${res.status} ${await res.text()}`)
  }
}

export interface ApiAge4Projection {
  personal_data_uuid: string
  savable_after_b4: number
  expiring_at_b4: number
  projected_left_at_b4: number
  savable_cap_at_b4: number
}

export interface ApiWorkspaceOverview {
  parent_projections: ApiAge4Projection[]
  combined_expiring_at_b4: number
  combined_days_left: number
}

export async function apiGetOverview(
  token: string,
  workspaceId: string,
  childId: string,
): Promise<ApiWorkspaceOverview> {
  const url = `${API_BASE}/api/analytics/${workspaceId}/overview?child_id=${childId}`
  const res = await fetch(url, { headers: { Authorization: `Bearer ${token}` } })
  return parseJsonOrThrow<ApiWorkspaceOverview>(res, 'get workspace overview')
}