import type {
  CreateEventDto,
  CreateEventFaqDto,
  CreateEventMediaDto,
  EventCategoryResponseDto,
  EventResponseDto,
  OrganizerGuestListResponseDto,
} from '@/api/generated/models'
import { getAdminEvents } from '@/api/generated/admin-events/admin-events'
import { getEventCategories } from '@/api/generated/event-categories/event-categories'
import { getEventExtras } from '@/api/generated/event-extras/event-extras'
import { getMyEvents } from '@/api/generated/my-events/my-events'
import { unwrapApiPayload } from '@/helpers/listResponse'
import axiosInstance from '@/config/axios'
import { API_ROUTES } from '@/services/config'
import { texts } from '@/texts'
import { ANALYTICS_EVENTS, trackAnalyticsEventOnce } from '@/lib/analytics'

export type EventCategory = EventCategoryResponseDto
export type CreateEventPayload = CreateEventDto
export type CreatedEvent = EventResponseDto
export type CreateEventMediaPayload = CreateEventMediaDto
export type CreateEventFaqPayload = CreateEventFaqDto
export type OrganizerGuestList = OrganizerGuestListResponseDto
export interface PreviousAttendee {
  userId: string
  firstName: string | null
  lastName: string | null
}

interface MyHostedEventSummary {
  id: string
  title: string
  slug: string
  status: string
  startsAt: string
  bookedCount: number
  reservedCapacity?: number
  capacity: number
  isFree: boolean
  price: number
  createdAt: string
  adminApprovedAt?: string | null
  rejectionReason?: string | null
}

/** The endpoint returns the full event today while this intersection keeps older cached summaries valid. */
export type MyHostedEvent = MyHostedEventSummary & Partial<Omit<EventResponseDto, keyof MyHostedEventSummary>>

const myEventsApi = getMyEvents()
const adminEventsApi = getAdminEvents()
const eventCategoriesApi = getEventCategories()
const eventExtrasApi = getEventExtras()

export async function fetchEventCategories(): Promise<EventCategory[]> {
  const response = await eventCategoriesApi.eventCategoriesControllerList()
  const payload = unwrapApiPayload(response.data)

  return Array.isArray(payload) ? (payload as EventCategory[]) : []
}

export async function createEvent(payload: CreateEventPayload): Promise<CreatedEvent> {
  const response = await myEventsApi.myEventsControllerCreate(payload)
  const data = unwrapApiPayload<CreatedEvent>(response.data)

  if (!data?.id) {
    throw new Error(texts.common.invalidServerResponse)
  }

  trackAnalyticsEventOnce(ANALYTICS_EVENTS.EVENT_CREATED, data.id, {
    event_id: data.id,
    event_slug: data.slug,
    category_id: payload.categoryId,
    is_free: payload.isFree,
  })

  return data
}

// Self-service endpoints (events/:id, events/:id/publish) — ownership-
// checked server-side against the logged-in user. Only works if the
// currently logged-in user is the event's own organizer_id. For an admin
// acting on any organizer's event, use the *AsAdmin variants below instead.
export async function publishEvent(eventId: string): Promise<CreatedEvent> {
  const response = await myEventsApi.myEventsControllerPublish(eventId)
  const event = unwrapApiPayload<CreatedEvent>(response.data)

  trackAnalyticsEventOnce(ANALYTICS_EVENTS.EVENT_PUBLISHED, event.id, {
    event_id: event.id,
    event_slug: event.slug,
  })

  return event
}

export async function cancelEvent(eventId: string): Promise<CreatedEvent> {
  const response = await myEventsApi.myEventsControllerCancel(eventId)

  return unwrapApiPayload<CreatedEvent>(response.data)
}

export async function completeEvent(eventId: string): Promise<CreatedEvent> {
  const response = await myEventsApi.myEventsControllerComplete(eventId)

  return unwrapApiPayload<CreatedEvent>(response.data)
}

/** Soft-delete when booked_count = 0. */
export async function deleteEvent(eventId: string): Promise<CreatedEvent> {
  const response = await axiosInstance.delete(API_ROUTES.EVENTS.DELETE(eventId))

  return unwrapApiPayload<CreatedEvent>(response.data)
}

/** Admin approval is one half of the two-key publication workflow. */
export async function approveEventAsAdmin(eventId: string): Promise<CreatedEvent> {
  const response = await adminEventsApi.adminEventsControllerApprove(eventId)

  return unwrapApiPayload<CreatedEvent>(response.data)
}

/** Force-publish bypass: skips the request/approve flow entirely. */
export async function publishEventAsAdmin(eventId: string): Promise<CreatedEvent> {
  const response = await adminEventsApi.adminEventsControllerPublish(eventId)

  return unwrapApiPayload<CreatedEvent>(response.data)
}

export async function rejectEventAsAdmin(eventId: string, rejectionReason: string): Promise<CreatedEvent> {
  const response = await adminEventsApi.adminEventsControllerReject(eventId, { rejectionReason })

  return unwrapApiPayload<CreatedEvent>(response.data)
}

export async function cancelEventAsAdmin(eventId: string): Promise<CreatedEvent> {
  const response = await adminEventsApi.adminEventsControllerCancel(eventId)

  return unwrapApiPayload<CreatedEvent>(response.data)
}

export async function completeEventAsAdmin(eventId: string): Promise<CreatedEvent> {
  const response = await adminEventsApi.adminEventsControllerComplete(eventId)

  return unwrapApiPayload<CreatedEvent>(response.data)
}

export async function deleteEventAsAdmin(eventId: string): Promise<CreatedEvent> {
  const response = await axiosInstance.delete(API_ROUTES.EVENTS.ADMIN_DELETE(eventId))

  return unwrapApiPayload<CreatedEvent>(response.data)
}

export type EventEditAccessMode = 'admin' | 'owner'

export async function updateEvent(eventId: string, payload: Partial<CreateEventPayload>): Promise<CreatedEvent> {
  const response = await myEventsApi.myEventsControllerUpdate(eventId, payload)

  return unwrapApiPayload<CreatedEvent>(response.data)
}

export async function updateEventReservedCapacity(
  eventId: string,
  reservedCapacity: number,
  accessMode: EventEditAccessMode = 'owner'
): Promise<CreatedEvent> {
  const path = accessMode === 'admin' ? API_ROUTES.EVENTS.ADMIN_RESERVED_CAPACITY(eventId) : API_ROUTES.EVENTS.RESERVED_CAPACITY(eventId)
  const response = await axiosInstance.patch(path, { reservedCapacity })

  return unwrapApiPayload<CreatedEvent>(response.data)
}

/** Admin can edit any organizer's event (same field locks as host). */
export async function updateEventAsAdmin(eventId: string, payload: Partial<CreateEventPayload>): Promise<CreatedEvent> {
  const response = await axiosInstance.patch(API_ROUTES.EVENTS.ADMIN_DETAIL(eventId), payload)

  return unwrapApiPayload<CreatedEvent>(response.data)
}

/** Admin-only: set (or, with null, clear) this event's platform commission override. */
export async function updateEventCommissionAsAdmin(eventId: string, commissionPercent: number | null): Promise<CreatedEvent> {
  const response = await axiosInstance.patch(API_ROUTES.EVENTS.ADMIN_COMMISSION(eventId), { commissionPercent })

  return unwrapApiPayload<CreatedEvent>(response.data)
}

/**
 * Full event for edit/clone forms. Backend authorizes owner OR admin;
 * callers do not pass access mode.
 */
export async function fetchEventForEdit(eventId: string): Promise<CreatedEvent> {
  const response = await axiosInstance.get(API_ROUTES.EVENTS.FOR_EDIT(eventId))

  return unwrapApiPayload<CreatedEvent>(response.data)
}

/** Admin detail including bookmarkCount + organizer contact. */
export async function fetchAdminEventDetail(eventId: string): Promise<CreatedEvent> {
  const response = await axiosInstance.get(API_ROUTES.EVENTS.ADMIN_DETAIL(eventId))

  return unwrapApiPayload<CreatedEvent>(response.data)
}

export async function createEventMedia(eventId: string, payload: CreateEventMediaPayload): Promise<void> {
  await eventExtrasApi.eventMediaControllerCreate(eventId, payload)
}

export async function updateEventMedia(eventId: string, mediaId: string, payload: Partial<CreateEventMediaPayload>): Promise<void> {
  await eventExtrasApi.eventMediaControllerUpdate(eventId, mediaId, payload)
}

export async function deleteEventMedia(eventId: string, mediaId: string): Promise<void> {
  await eventExtrasApi.eventMediaControllerRemove(eventId, mediaId)
}

export async function createEventFaq(eventId: string, payload: CreateEventFaqPayload): Promise<void> {
  await eventExtrasApi.eventFaqsControllerCreate(eventId, payload)
}

export async function updateEventFaq(eventId: string, faqId: string, payload: Partial<CreateEventFaqPayload>): Promise<void> {
  await eventExtrasApi.eventFaqsControllerUpdate(eventId, faqId, payload)
}

export async function deleteEventFaq(eventId: string, faqId: string): Promise<void> {
  await eventExtrasApi.eventFaqsControllerRemove(eventId, faqId)
}

export interface EventRevisionPayload {
  title?: string
  slug?: string
  shortDescription?: string
  description?: string
  categoryId?: number
  startsAt?: string
  endsAt?: string
  provinceId?: number
  cityId?: number
  address?: string
  lat?: number
  lng?: number
  isFree?: boolean
  price?: number
  capacity?: number
  genderRestriction?: string
  ageRestriction?: string
  cancellationFeePercent?: number
  settings?: CreateEventPayload['settings']
  media: CreateEventMediaPayload[]
  faqs?: CreateEventFaqPayload[]
}

export interface EventRevision {
  id: string
  eventId: string
  status: string
  payload: EventRevisionPayload & Record<string, unknown>
  createdBy: string
  reviewedBy: string | null
  rejectionReason: string | null
  submittedAt: string
  decidedAt: string | null
}

export async function submitEventRevision(eventId: string, payload: EventRevisionPayload): Promise<EventRevision> {
  const response = await axiosInstance.post(API_ROUTES.EVENTS.REVISION_SUBMIT(eventId), payload)

  return unwrapApiPayload<EventRevision>(response.data)
}

export async function fetchPendingEventRevision(eventId: string): Promise<EventRevision | null> {
  try {
    const response = await axiosInstance.get(API_ROUTES.EVENTS.REVISION_PENDING(eventId))

    return unwrapApiPayload<EventRevision>(response.data)
  } catch (error) {
    const status = (error as { response?: { status?: number } })?.response?.status

    if (status === 404) return null
    throw error
  }
}

export async function withdrawPendingEventRevision(eventId: string): Promise<void> {
  await axiosInstance.delete(API_ROUTES.EVENTS.REVISION_WITHDRAW(eventId))
}

export async function fetchAdminPendingEventRevision(eventId: string): Promise<EventRevision | null> {
  try {
    const response = await axiosInstance.get(API_ROUTES.EVENTS.ADMIN_REVISION_PENDING(eventId))

    return unwrapApiPayload<EventRevision>(response.data)
  } catch (error) {
    const status = (error as { response?: { status?: number } })?.response?.status

    if (status === 404) return null
    throw error
  }
}

export async function approveEventRevisionAsAdmin(eventId: string, revisionId: string): Promise<CreatedEvent> {
  const response = await axiosInstance.patch(API_ROUTES.EVENTS.ADMIN_REVISION_APPROVE(eventId, revisionId))

  return unwrapApiPayload<CreatedEvent>(response.data)
}

export async function rejectEventRevisionAsAdmin(eventId: string, revisionId: string, rejectionReason: string): Promise<EventRevision> {
  const response = await axiosInstance.patch(API_ROUTES.EVENTS.ADMIN_REVISION_REJECT(eventId, revisionId), {
    rejectionReason,
  })

  return unwrapApiPayload<EventRevision>(response.data)
}

export async function linkGuestListToEvent(eventId: string, listId: string): Promise<void> {
  await eventExtrasApi.eventGuestListLinksControllerLink(eventId, { listId })
}

export async function fetchOrganizerGuestLists(): Promise<OrganizerGuestList[]> {
  const response = await eventExtrasApi.organizerGuestListsControllerList({ page: 1, pageSize: 100 })
  const payload = unwrapApiPayload(response.data)
  const items = Array.isArray(payload.items) ? payload.items : Array.isArray(payload) ? payload : []

  return items as OrganizerGuestList[]
}

export async function fetchPreviousAttendees(): Promise<PreviousAttendee[]> {
  const response = await axiosInstance.get('/organizer-guest-lists/previous-attendees')
  const payload = unwrapApiPayload(response.data)

  return Array.isArray(payload) ? (payload as PreviousAttendee[]) : []
}

export async function setPreviousAttendeeGuests(eventId: string, userIds: string[]): Promise<void> {
  // Persists the invite set. SMS is sent automatically when the event is published
  // (or immediately if it is already published and has not been notified yet).
  await axiosInstance.put(`/events/${eventId}/guest-list-links/invited-guests`, { userIds })
}