import {z} from 'zod'

export type GetApiRouteArgs = {filters?: string | undefined};

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

export const metadatum = z.object({key: z.string().optional(), value: z.string().optional()});

export const match = z.object({kind: z.string().optional(), behavior: z.string().optional(), from: metadatum.optional(), to: metadatum.optional()});

export const matches = z.array(match);

export const metadata = z.array(metadatum);

export const headerDatum = z.object({name: z.string().optional(), value: z.string().optional(), value_is_literal: z.boolean().optional()});

export const cookieDatum = z.object({name: z.string().optional(), value: z.string().optional(), value_is_literal: z.boolean().optional(), expires_in_sec: z.number().int().optional(), domain: z.string().optional(), path: z.string().optional(), secure: z.boolean().optional(), http_only: z.boolean().optional(), same_site: z.enum(["Strict", "Lax"]).optional()});

export const responseData = z.object({headers: z.array(headerDatum).optional(), cookies: z.array(cookieDatum).optional()});

export const clusterConstraint = z.object({constraint_key: z.string().optional(), cluster_key: z.string().optional(), metadata: metadata.optional(), properties: metadata.optional(), response_data: responseData.optional(), weight: z.number().int().optional()});

export const clusterConstraints = z.array(clusterConstraint);

export const allConstraints = z.object({light: clusterConstraints, dark: clusterConstraints.optional(), tap: clusterConstraints.optional()});

export const cohortSeed = z.object({type: z.enum(["header", "cookie", "query"]).optional(), name: z.string().optional(), use_zero_value_seed: z.boolean().optional()});

export const rule = z.object({rule_key: z.string().optional(), methods: z.array(z.string()).optional(), matches: matches.optional(), constraints: allConstraints.optional(), cohort_seed: cohortSeed.optional()});

export const retryPolicy = z.object({num_retries: z.number().int().optional(), per_try_timeout_msec: z.number().int().optional(), timeout_msec: z.number().int().optional()});

export const route = z.object({route_key: z.string(), domain_key: z.string(), zone_key: z.string(), shared_rules_key: z.string(), path: z.string(), checksum: z.string(), rules: z.array(rule).optional(), response_data: responseData.optional(), cohort_seed: cohortSeed.optional(), retry_policy: retryPolicy.optional()});

export const multiRouteResult = z.object({result: z.array(route).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
};

/**
 * get routes
 * 
 * GET /route
 */
export const getApiRoute = async (args: GetApiRouteArgs, options?: GetApiRouteOptions) => {
const {baseUrl = "https://api.turbinelabs.io/v1.0", fetch: fetchFn = fetch, apiKey} = options ?? {}

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

if (args.filters != null) query.append("filters", String(args.filters))
if (apiKey !== undefined) headers.set("Authorization", apiKey)

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