import type {
  AttendeeDto,
  AttendeeList,
  BulkCreateAttendees,
  BulkCreateAttendeesResult,
  ConnectPayment,
  ConnectPaymentResult,
  CreateAttendee,
  CreateAttendeeResult,
  CreateFirstGroup,
  CreateFirstGroupResult,
  CreateGroupResult,
  CreateGroupWaitlistEntry,
  GroupDto,
  GroupInviteInfoDto,
  GroupList,
  GroupWaitlistEntryDto,
  GroupWaitlistList,
  InviteTokenResult,
  JoinGroupViaInvite,
  JoinGroupViaInviteResult,
  OnboardingStatusDto,
  ProblemDetails,
  PromoteGroupWaitlistEntryResult,
  RemoveAttendeeResult,
  RemoveGroupWaitlistEntryResult,
} from '@gruperly/shared'

const API_URL = import.meta.env.VITE_API_URL ?? 'http://localhost:4000'

export class ApiError extends Error {
  constructor(
    readonly status: number,
    readonly problem: ProblemDetails | null,
  ) {
    super(problem?.detail ?? problem?.title ?? `Error ${status}`)
    this.name = 'ApiError'
  }
}

type JsonBody = Record<string, unknown> | unknown[]

async function apiFetch<T>(path: string, init?: RequestInit): Promise<T> {
  const headers = new Headers(init?.headers)
  headers.set('Content-Type', 'application/json')

  const res = await fetch(`${API_URL}${path}`, {
    ...init,
    headers,
    credentials: 'include',
  })

  if (!res.ok) {
    let problem: ProblemDetails | null = null
    try {
      const body = (await res.json()) as Partial<ProblemDetails>
      if (body && typeof body === 'object' && typeof body.title === 'string') {
        problem = body as ProblemDetails
      }
    } catch {
      // Sin cuerpo JSON: usamos el error genérico.
    }
    throw new ApiError(res.status, problem)
  }

  return (await res.json()) as T
}

export const getOnboardingStatus = () => apiFetch<OnboardingStatusDto>('/api/v1/onboarding/status')

export const connectPayment = (payload: ConnectPayment) =>
  apiFetch<ConnectPaymentResult>('/api/v1/onboarding/payment-setup', {
    method: 'POST',
    body: JSON.stringify(payload),
  })

export const createFirstGroup = (payload: CreateFirstGroup) =>
  apiFetch<CreateFirstGroupResult>('/api/v1/onboarding/first-group', {
    method: 'POST',
    body: JSON.stringify(payload),
  })

export const createGroup = (payload: CreateFirstGroup) =>
  apiFetch<CreateGroupResult>('/api/v1/groups', {
    method: 'POST',
    body: JSON.stringify(payload),
  })

export const getGroups = () => apiFetch<GroupList>('/api/v1/groups')

export const getGroup = (groupId: string) =>
  apiFetch<GroupDto>(`/api/v1/groups/${groupId}`)

export const getInviteToken = (groupId: string, regenerate = false) =>
  regenerate
    ? apiFetch<InviteTokenResult>(`/api/v1/groups/${groupId}/invite-token?regenerate=true`, {
        method: 'POST',
      })
    : apiFetch<InviteTokenResult>(`/api/v1/groups/${groupId}/invite-token`)

export const getInviteInfo = (token: string) =>
  apiFetch<GroupInviteInfoDto>(`/api/v1/invitations/${token}`)

export const joinViaInvite = (token: string, payload: JoinGroupViaInvite) =>
  apiFetch<JoinGroupViaInviteResult>(`/api/v1/invitations/${token}/join`, {
    method: 'POST',
    body: JSON.stringify(payload),
  })

export const createAttendee = (
  groupId: string,
  payload: CreateAttendee,
  options?: { allowOverflow?: boolean },
) =>
  apiFetch<CreateAttendeeResult>(
    `/api/v1/groups/${groupId}/attendees${options?.allowOverflow ? '?allowOverflow=true' : ''}`,
    {
      method: 'POST',
      body: JSON.stringify(payload),
    },
  )

export const addToGroupWaitlist = (groupId: string, payload: CreateGroupWaitlistEntry) =>
  apiFetch<GroupWaitlistEntryDto>(`/api/v1/groups/${groupId}/waitlist`, {
    method: 'POST',
    body: JSON.stringify(payload),
  })

export const bulkCreateAttendees = (groupId: string, payload: BulkCreateAttendees) =>
  apiFetch<BulkCreateAttendeesResult>(`/api/v1/groups/${groupId}/attendees/bulk`, {
    method: 'POST',
    body: JSON.stringify(payload),
  })

export const getGroupAttendees = (groupId: string, page = 1, pageSize = 20) =>
  apiFetch<AttendeeList>(`/api/v1/groups/${groupId}/attendees?page=${page}&pageSize=${pageSize}`)

export const getGroupWaitlist = (groupId: string, page = 1, pageSize = 100) =>
  apiFetch<GroupWaitlistList>(`/api/v1/groups/${groupId}/waitlist?page=${page}&pageSize=${pageSize}`)

export const promoteGroupWaitlistEntry = (groupId: string, entryId: string) =>
  apiFetch<PromoteGroupWaitlistEntryResult>(`/api/v1/groups/${groupId}/waitlist/${entryId}/promote`, {
    method: 'POST',
  })

export const removeGroupWaitlistEntry = (groupId: string, entryId: string) =>
  apiFetch<RemoveGroupWaitlistEntryResult>(`/api/v1/groups/${groupId}/waitlist/${entryId}`, {
    method: 'DELETE',
  })

export const removeGroupAttendee = (
  groupId: string,
  attendeeId: string,
  options?: { promoteFromWaitlist?: boolean },
) =>
  apiFetch<RemoveAttendeeResult>(
    `/api/v1/groups/${groupId}/attendees/${attendeeId}${options?.promoteFromWaitlist ? '?promoteFromWaitlist=true' : ''}`,
    {
      method: 'DELETE',
    },
  )