import type { DeptActuals, DeptScheduled, NetSalesDay, WageBudget, AppSetting } from './types'

const BASE = '/wages/api'

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

export function getActuals(from: string, to: string): Promise<{ departments: DeptActuals[]; show_oncosts: boolean }> {
  return request(`/actuals?from=${from}&to=${to}`)
}

export function getScheduled(from: string, to: string): Promise<{ departments: DeptScheduled[] }> {
  return request(`/scheduled?from=${from}&to=${to}`)
}

export function getNetSales(from: string, to: string): Promise<{ days: NetSalesDay[] }> {
  return request(`/net-sales?from=${from}&to=${to}`)
}

export function getBudgets(): Promise<{ budgets: WageBudget[] }> {
  return request('/budgets')
}

export function saveBudget(month: string, budget_amount: number): Promise<{ ok: boolean }> {
  return request(`/budgets/${month}`, {
    method: 'PUT',
    body: JSON.stringify({ budget_amount }),
  })
}

export function triggerSync(): Promise<{ ok: boolean; actual_rows: number; scheduled_rows: number }> {
  return request('/sync', { method: 'POST' })
}

export function getSyncStatus(): Promise<{ sync_last_at: string | null; backfill_last_at: string | null; backfill_running: boolean }> {
  return request('/sync/status')
}

export function cancelBackfill(): Promise<{ ok: boolean }> {
  return request('/sync/backfill/cancel', { method: 'POST' })
}

export function getDepartments(): Promise<{ departments: { id: string; name: string }[] }> {
  return request('/departments')
}

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

export function saveSettings(settings: { key: string; value: string }[]): Promise<{ ok: boolean }> {
  return request('/settings', { method: 'PUT', body: JSON.stringify({ settings }) })
}

export function downloadExport(view: string, from: string, to: string): void {
  window.open(`${BASE}/export?view=${view}&from=${from}&to=${to}`, '_blank')
}