import {z} from 'zod'

export type GetApiApiV2SlasPoliciesOptions = {baseUrl?: string | undefined, apiTokenAuth?: {username: string, password: string} | undefined, fetch?: typeof fetch | undefined};

export const sLAPolicyFilterConditionObject = z.object({field: z.string().optional(), operator: z.string().optional(), value: z.union([z.string(), z.array(z.union([z.string(), z.number().int()]))]).optional()});

export const sLAPolicyFilterObject = z.object({all: z.array(sLAPolicyFilterConditionObject).optional(), any: z.array(sLAPolicyFilterConditionObject).optional()});

export const sLAPolicyMetricObject = z.object({business_hours: z.boolean().optional(), metric: z.string().optional(), priority: z.string().optional(), target: z.number().int().optional()});

export const sLAPolicyObject = z.object({created_at: z.string().optional(), description: z.string().optional(), filter: sLAPolicyFilterObject, id: z.number().int().optional(), policy_metrics: z.array(sLAPolicyMetricObject).optional(), position: z.number().int().optional(), title: z.string(), updated_at: z.string().optional(), url: z.string().optional()});

export const sLAPoliciesResponse = z.object({count: z.number().int().optional(), next_page: z.string().nullable().optional(), previous_page: z.string().nullable().optional(), sla_policies: z.array(sLAPolicyObject).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
};

/**
 * List SLA Policies
 * 
 * GET /api/v2/slas/policies
 */
export const getApiApiV2SlasPolicies = async (options?: GetApiApiV2SlasPoliciesOptions) => {
const {baseUrl = "https://example.zendesk.com", fetch: fetchFn = fetch, apiTokenAuth} = options ?? {}

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

if (apiTokenAuth !== undefined) headers.set('authorization', `Basic ${btoa(`${apiTokenAuth.username}:${apiTokenAuth.password}`)}`)

const url = `${baseUrl.replace(/\/+$/, '')}/api/v2/slas/policies${query.size > 0 ? `?${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(sLAPoliciesResponse, await res.json())
};