// REST client for the imap-copier control API.
// All requests carry the session cookie; a 401 anywhere bounces to #/login.

export type TLSMode = 'ssl' | 'starttls' | 'plain'

export interface Endpoint {
  id: number
  role_label: string
  host: string
  port: number
  tls_mode: TLSMode
}

export interface Task {
  id: number
  name: string
  src_endpoint_id: number
  dst_endpoint_id: number
  status: string
  folder_mapping?: Record<string, string>
  schedule_interval_seconds?: number
  broken?: boolean
  next_run_at?: string | null
}

export type TestStatus = 'pending' | 'ok' | 'fail' | string

export interface Account {
  id: number
  src_login: string
  dst_login: string
  test_src_status: TestStatus
  test_dst_status: TestStatus
  status: string
  copied: number
  skipped: number
  errors: number
  last_error?: string
  folder_mapping?: Record<string, string>
  excluded_folders?: string[]
}

export interface TaskDetail {
  task: Task
  accounts: Account[]
}

export class ApiError extends Error {}

export async function api<T = unknown>(path: string, opts: RequestInit = {}): Promise<T> {
  const res = await fetch(path, { credentials: 'include', ...opts })
  if (res.status === 401) {
    location.hash = '#/login'
    throw new ApiError('unauthorized')
  }
  if (!res.ok) {
    const body = await res.text()
    throw new ApiError(body || res.statusText)
  }
  const ct = res.headers.get('content-type') || ''
  if (ct.includes('application/json')) return res.json() as Promise<T>
  return res.text() as unknown as T
}

const jsonBody = (body: unknown): RequestInit => ({
  method: 'POST',
  headers: { 'content-type': 'application/json' },
  body: JSON.stringify(body),
})

export const login = (user: string, pass: string) => api('/api/login', jsonBody({ user, pass }))

export const logout = () => api('/api/logout', { method: 'POST' })

export const listEndpoints = () => api<Endpoint[]>('/api/endpoints')

export const createEndpoint = (body: { role_label: string; host: string; port: number; tls_mode: TLSMode }) =>
  api<{ id: number }>('/api/endpoints', jsonBody(body))

export const updateEndpoint = (
  id: number,
  body: { role_label: string; host: string; port: number; tls_mode: TLSMode },
) => api(`/api/endpoints/${id}`, { ...jsonBody(body), method: 'PUT' })

export const deleteEndpoint = (id: number) => api(`/api/endpoints/${id}`, { method: 'DELETE' })

export const deleteTask = (id: number) => api(`/api/tasks/${id}`, { method: 'DELETE' })

export const deleteAccount = (taskId: number, accountId: number) =>
  api(`/api/tasks/${taskId}/accounts/${accountId}`, { method: 'DELETE' })

export const cancelAccount = (taskId: number, accountId: number) =>
  api(`/api/tasks/${taskId}/accounts/${accountId}/cancel`, { method: 'POST' })

export interface ProbeSide {
  ok: boolean
  folders?: string[]
  error?: string
}

export interface ProbeResult {
  src: ProbeSide
  dst: ProbeSide
}

export const probeFolders = (
  taskId: number,
  creds: { src_login: string; src_pass: string; dst_login: string; dst_pass: string },
) => api<ProbeResult>(`/api/tasks/${taskId}/probe`, jsonBody(creds))

export const probeAccountFolders = (taskId: number, accId: number) =>
  api<ProbeResult>(`/api/tasks/${taskId}/accounts/${accId}/probe`, { method: 'POST' })

export const setAccountFolderMapping = (
  taskId: number,
  accId: number,
  mapping: Record<string, string>,
  excluded: string[],
) =>
  api(`/api/tasks/${taskId}/accounts/${accId}/folder-mapping`, {
    ...jsonBody({ mapping, excluded }),
    method: 'PUT',
  })

export const listTasks = () => api<Task[]>('/api/tasks')

export const getTask = (id: number) => api<TaskDetail>(`/api/tasks/${id}`)

export const createTask = (body: {
  name: string
  src_endpoint_id: number
  dst_endpoint_id: number
  folder_mapping?: Record<string, string>
}) => api<{ id: number }>('/api/tasks', jsonBody(body))

export const createAccount = (
  id: number,
  body: { src_login: string; src_pass: string; dst_login: string; dst_pass: string },
) => api<{ id: number }>(`/api/tasks/${id}/accounts`, jsonBody(body))

export const testAccounts = (id: number) => api(`/api/tasks/${id}/test`, { method: 'POST' })

export const runTask = (id: number, accountIds?: number[]) =>
  api(`/api/tasks/${id}/run`, accountIds?.length ? jsonBody({ account_ids: accountIds }) : { method: 'POST' })

export interface Run {
  id: number
  task_id: number
  status: string
  started_at: string
  finished_at: string | null
  total_copied: number
  total_skipped: number
  total_errors: number
  trigger: string
}

export const setTaskSchedule = (taskId: number, intervalSeconds: number) =>
  api(`/api/tasks/${taskId}/schedule`, { ...jsonBody({ interval_seconds: intervalSeconds }), method: 'PUT' })

export const listRuns = (taskId: number) => api<Run[]>(`/api/tasks/${taskId}/runs`)

export interface AccountError {
  id: number
  account_id: number
  run_id: number
  kind: string // folder | message | account
  folder: string
  message_ref: string
  error: string
  created_at: string
}

export const listAccountErrors = (taskId: number, accountId: number) =>
  api<AccountError[]>(`/api/tasks/${taskId}/accounts/${accountId}/errors`)

export const importCSV = (id: number, file: File) => {
  const fd = new FormData()
  fd.append('file', file)
  return api<{ imported: number }>(`/api/tasks/${id}/import`, { method: 'POST', body: fd })
}

// A Kerio Connect export carries no domain, so the operator supplies it here;
// the login and password apply to both sides of the migration.
export const importKerioCSV = (id: number, file: File, domain: string) => {
  const fd = new FormData()
  fd.append('file', file)
  fd.append('format', 'kerio')
  fd.append('domain', domain)
  return api<{ imported: number }>(`/api/tasks/${id}/import`, { method: 'POST', body: fd })
}