import {z} from 'zod'

export type RecurrencePatternDto = {frequency: string, interval?: (number | unknown) | undefined, daysOfWeek?: (Array<string> | null) | undefined, dayOfMonth?: (number | unknown | null) | undefined, endType: string, endDate?: (string | null) | undefined, endAfterCount?: (number | unknown | null) | undefined};

export type CheckScheduleConflictsRequest = {locationId: string, startTime: string, endTime: string, isRecurring?: boolean | undefined, recurrencePattern?: (RecurrencePatternDto | null) | undefined, excludeScheduleItemId?: (string | null) | undefined};

export type CreateApiScheduleItemsCheckConflictsArgs = {body: CheckScheduleConflictsRequest};

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

export const scheduleConflictDto = z.object({proposedStart: z.string().optional(), proposedEnd: z.string().optional(), conflictingItemId: z.string(), conflictingItemTitle: z.string(), conflictingItemType: z.string(), conflictingStart: z.string().optional(), conflictingEnd: z.string().optional(), conflictingIsRecurringInstance: z.boolean().optional(), conflictingParentId: z.string().nullable().optional(), hasAppointment: z.boolean().optional()});

export const scheduleConflictCheckResponse = z.object({hasConflicts: z.boolean().optional(), conflicts: z.array(scheduleConflictDto).optional(), totalOccurrencesChecked: z.union([z.number().int(), z.string()]).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
};

/**
 * Check for schedule conflicts before creating/updating an item.
 * Always returns 200 with conflict details in the response body.
 * 
 * POST /ScheduleItems/check-conflicts
 */
export const createApiScheduleItemsCheckConflicts = async (args: CreateApiScheduleItemsCheckConflictsArgs, options?: CreateApiScheduleItemsCheckConflictsOptions) => {
const {baseUrl = "https://api.clinicos.vet/backend/business", fetch: fetchFn = fetch, Bearer} = options ?? {}

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

if (Bearer !== undefined) headers.set('authorization', `Bearer ${Bearer}`)

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

const res = await fetchFn(url, {method: "POST", headers, body: JSON.stringify(args.body)})

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

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