import type { GridData, AppSettings } from './types'

const BASE = '/twin-optimiser/api'

async function request<T>(path: string, opts?: RequestInit): Promise<T> {
  const res = await fetch(BASE + path, { credentials: 'include', ...opts })
  if (res.status === 401) {
    ;(window.top ?? window).location.href = '/login'
    throw new Error('Unauthenticated')
  }
  if (!res.ok) {
    const body = await res.json().catch(() => ({})) as { error?: string }
    throw new Error(body.error || `HTTP ${res.status}`)
  }
  return res.json() as Promise<T>
}

export function getGrid(startDate?: string, days = 14, force = false): Promise<GridData> {
  const p = new URLSearchParams()
  if (startDate) p.set('start_date', startDate)
  p.set('days', String(days))
  if (force) p.set('force', '1')
  return request<GridData>(`/grid?${p}`)
}

export function getSettings(): Promise<AppSettings> {
  return request<AppSettings>('/settings')
}

export function postSettings(settings: Partial<AppSettings>): Promise<AppSettings> {
  return request<AppSettings>('/settings', {
    method: 'POST',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify(settings),
  })
}

export function testNewbook(): Promise<{ ok: boolean; message?: string; error?: string }> {
  return request('/newbook/test', { method: 'POST' })
}