import {z} from 'zod'

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

export const enumValue = z.object({value: z.string(), display: z.string()});

export const type: z.ZodType<Type> = z.object({name: z.enum(["address", "array", "byte-count", "correlation-id", "country-code", "duration", "enum", "host", "label", "path", "port", "query", "script", "status-code", "string", "timestamp", "url", "url-map-id", "web-control-id"]), element_type: z.lazy(() => type.optional()), values: z.array(enumValue).optional()});

export const field = z.object({name: z.string(), type: type, display: z.string(), description: z.string(), is_metric: z.boolean(), aliases: z.array(z.string()).optional()});

export const retention = z.object({online_age: z.number().int().optional()});

export const logSchema = z.object({type: z.enum(["access", "cdn", "csp-reports", "custom", "pageviews", "events"]), display: z.enum(["CDN logs", "CSP reports", "Pageview logs", "Traffic viewer", "Event logs"]), default_order: z.string(), fields: z.array(field), retention: z.union([z.array(retention), retention])});

export const getApiLogSchemasResponse = z.array(logSchema);

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
};

/**
 * Get log schemas
 * 
 * GET /log-schemas
 */
export const getApiLogSchemas = async (options?: GetApiLogSchemasOptions) => {
const {baseUrl = "https://api.webscale.com/v2", fetch: fetchFn = fetch} = options ?? {}

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

const url = `${baseUrl.replace(/\/+$/, '')}/log-schemas${query.size > 0 ? `?${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(getApiLogSchemasResponse, await res.json())
};