import {z} from 'zod'

export type GetApiOnlineBookingReadinessArgs = {appointmentTypeId?: string | undefined, speciesId?: string | undefined, date?: string | undefined};

export type GetApiOnlineBookingReadinessOptions = {baseUrl?: string | undefined, Bearer?: string | undefined, fetch?: typeof fetch | undefined};

export const readinessTypeInfo = z.object({id: z.string(), name: z.string(), isDefault: z.boolean()});

export const bookableTypesGate = z.object({pass: z.boolean(), source: z.string(), types: z.array(readinessTypeInfo)});

export const stageCount = z.object({key: z.string(), surviving: z.union([z.number().int(), z.string()])});

export const readinessRoomInfo = z.object({id: z.string(), name: z.string()});

export const locationsGate = z.object({pass: z.boolean(), totalCount: z.union([z.number().int(), z.string()]), stages: z.array(stageCount), survivingRooms: z.array(readinessRoomInfo)});

export const typeRoomsGate = z.object({typeId: z.string(), typeName: z.string(), hasIntents: z.boolean(), effectiveRooms: z.array(readinessRoomInfo), pass: z.boolean()});

export const dayOfWeek = z.number().int();

export const roomHoursInfo = z.object({roomId: z.string(), roomName: z.string(), hasOwnHoursRows: z.boolean(), openDays: z.array(dayOfWeek)});

export const hoursGate = z.object({pass: z.boolean(), clinicDefaultsConfigured: z.boolean(), rooms: z.array(roomHoursInfo), upcomingClosures: z.union([z.number().int(), z.string()])});

export const windowGate = z.object({slotConfigurationRowExists: z.boolean(), defaultSlotDurationMinutes: z.union([z.number().int(), z.string()]), minAdvanceBookingHours: z.union([z.number().int(), z.string()]), maxAdvanceBookingDays: z.union([z.number().int(), z.string()]), bufferBetweenAppointments: z.union([z.number().int(), z.string()]), defaultWidgetAppointmentTypeId: z.string().nullable().optional(), defaultTypeResolves: z.boolean().nullable().optional()});

export const providerAvailabilityGate = z.object({rowCount: z.union([z.number().int(), z.string()]), providersWithRows: z.union([z.number().int(), z.string()])});

export const slotPreview = z.object({startUtc: z.string(), endUtc: z.string(), startLocal: z.string(), endLocal: z.string(), locationId: z.string(), locationName: z.string().nullable()});

export const dayPreviewGate = z.object({date: z.string(), timezone: z.string(), resolvedTypeId: z.string().nullable().optional(), resolvedTypeName: z.string().nullable().optional(), withinWindow: z.boolean(), openRoomNames: z.array(z.string()), closuresOnDate: z.union([z.number().int(), z.string()]), slots: z.array(slotPreview), emptyReason: z.string().nullable().optional()});

export const bookingReadinessReport = z.object({ready: z.boolean(), firstFailure: z.string().nullable().optional(), bookableTypes: bookableTypesGate, locations: locationsGate, typeRooms: z.array(typeRoomsGate), hours: hoursGate, window: windowGate, providerAvailability: providerAvailabilityGate, day: dayPreviewGate.nullable().optional()});

export const validateResponse = async <Output>(
  schema: {
    readonly '~standard': {
      readonly validate: (value: unknown) => ({ readonly value: Output; readonly issues?: undefined } | { readonly issues: ReadonlyArray<{ readonly message: string; readonly path?: ReadonlyArray<PropertyKey | { readonly key: PropertyKey }> | undefined }> }) | Promise<{ readonly value: Output; readonly issues?: undefined } | { readonly issues: ReadonlyArray<{ readonly message: string; readonly path?: ReadonlyArray<PropertyKey | { readonly key: PropertyKey }> | undefined }> }>
    }
  },
  value: unknown
): Promise<Output> => {
  const result = await schema['~standard'].validate(value)

  if (result.issues !== undefined) {
    const detail = result.issues
      .map(({ message, path }) =>
        path?.length
          ? `${path.map((segment) => String(typeof segment === 'object' ? segment.key : segment)).join('.')}: ${message}`
          : message
      )
      .join('; ')

    throw new Error(`Response does not match the schema: ${detail}`, { cause: { issues: result.issues } })
  }

  return result.value
};

/**
 * Evaluates online-booking readiness for the tenant. Optional filters narrow the
 * evaluation to one appointment type and/or species; a clinic-local date
 * additionally runs the real engine for that day and returns its slots — the ITE-560
 * slot tester ("preview as a client").
 * 
 * GET /online-booking/readiness
 */
export const getApiOnlineBookingReadiness = async (args: GetApiOnlineBookingReadinessArgs, options?: GetApiOnlineBookingReadinessOptions) => {
const {baseUrl = "https://api.clinicos.vet/backend/business", fetch: fetchFn = fetch, Bearer} = options ?? {}

const query = new URLSearchParams()
const headers = new Headers()
headers.set('accept', "application/json")

if (args.appointmentTypeId != null) query.append("appointmentTypeId", String(args.appointmentTypeId))
if (args.speciesId != null) query.append("speciesId", String(args.speciesId))
if (args.date != null) query.append("date", String(args.date))
if (Bearer !== undefined) headers.set('authorization', `Bearer ${Bearer}`)

const url = `${baseUrl.replace(/\/+$/, '')}/online-booking/readiness${query.size > 0 ? `?${query}` : ''}`

const res = await fetchFn(url, {method: "GET", headers})

if (!res.ok) throw new Error(`Request failed with status ${res.status}`, {cause: {status: res.status, body: await res.text()}})

return validateResponse(bookingReadinessReport, await res.json())
};