import {z} from 'zod'

export type CompareCompareResult = 'EQUAL' | 'GREATER' | 'LESS' | 'NOT_EQUAL';

export type CompareCompareTarget = 'VERSION' | 'CREATE' | 'MOD' | 'VALUE' | 'LEASE';

export type EtcdserverpbCompare = {create_revision?: unknown | undefined, key?: string | undefined, lease?: unknown | undefined, mod_revision?: unknown | undefined, range_end?: string | undefined, result?: CompareCompareResult | undefined, target?: CompareCompareTarget | undefined, value?: string | undefined, version?: unknown | undefined};

export type EtcdserverpbDeleteRangeRequest = {key?: string | undefined, prev_kv?: boolean | undefined, range_end?: string | undefined};

export type EtcdserverpbPutRequest = {ignore_lease?: boolean | undefined, ignore_value?: boolean | undefined, key?: string | undefined, lease?: unknown | undefined, prev_kv?: boolean | undefined, value?: string | undefined};

export type RangeRequestSortOrder = 'NONE' | 'ASCEND' | 'DESCEND';

export type RangeRequestSortTarget = 'KEY' | 'VERSION' | 'CREATE' | 'MOD' | 'VALUE';

export type EtcdserverpbRangeRequest = {count_only?: boolean | undefined, key?: string | undefined, keys_only?: boolean | undefined, limit?: unknown | undefined, max_create_revision?: unknown | undefined, max_mod_revision?: unknown | undefined, min_create_revision?: unknown | undefined, min_mod_revision?: unknown | undefined, range_end?: string | undefined, revision?: unknown | undefined, serializable?: boolean | undefined, sort_order?: RangeRequestSortOrder | undefined, sort_target?: RangeRequestSortTarget | undefined};

export type EtcdserverpbRequestOp = {request_delete_range?: EtcdserverpbDeleteRangeRequest | undefined, request_put?: EtcdserverpbPutRequest | undefined, request_range?: EtcdserverpbRangeRequest | undefined, request_txn?: EtcdserverpbTxnRequest | undefined};

export type EtcdserverpbTxnRequest = {compare?: Array<EtcdserverpbCompare> | undefined, failure?: Array<EtcdserverpbRequestOp> | undefined, success?: Array<EtcdserverpbRequestOp> | undefined};

export type CreateApiV3KvTxnArgs = {body: EtcdserverpbTxnRequest};

export type CreateApiV3KvTxnOptions = {baseUrl: string, ApiKey?: string | undefined, fetch?: typeof fetch | undefined};

export const etcdserverpbResponseHeader = z.object({cluster_id: z.string().optional(), member_id: z.string().optional(), raft_term: z.string().optional(), revision: z.string().optional()});

export const mvccpbKeyValue = z.object({create_revision: z.string().optional(), key: z.string().optional(), lease: z.string().optional(), mod_revision: z.string().optional(), value: z.string().optional(), version: z.string().optional()});

export const etcdserverpbDeleteRangeResponse = z.object({deleted: z.string().optional(), header: etcdserverpbResponseHeader.optional(), prev_kvs: z.array(mvccpbKeyValue).optional()});

export const etcdserverpbPutResponse = z.object({header: etcdserverpbResponseHeader.optional(), prev_kv: mvccpbKeyValue.optional()});

export const etcdserverpbRangeResponse = z.object({count: z.string().optional(), header: etcdserverpbResponseHeader.optional(), kvs: z.array(mvccpbKeyValue).optional(), more: z.boolean().optional()});

export const etcdserverpbResponseOp = z.object({response_delete_range: etcdserverpbDeleteRangeResponse.optional(), response_put: etcdserverpbPutResponse.optional(), response_range: etcdserverpbRangeResponse.optional(), response_txn: z.lazy(() => etcdserverpbTxnResponse.optional())});

export const etcdserverpbTxnResponse: z.ZodType<EtcdserverpbTxnResponse> = z.object({header: etcdserverpbResponseHeader.optional(), responses: z.array(etcdserverpbResponseOp).optional(), succeeded: z.boolean().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
};

/**
 * Txn processes multiple requests in a single transaction.
 * A txn request increments the revision of the key-value store
 * and generates events with the same revision for every completed request.
 * It is not allowed to modify the same key several times within one txn.
 * 
 * POST /v3/kv/txn
 */
export const createApiV3KvTxn = async (args: CreateApiV3KvTxnArgs, options: CreateApiV3KvTxnOptions) => {
const {baseUrl, fetch: fetchFn = fetch, ApiKey} = options ?? {}

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

if (ApiKey !== undefined) headers.set("Authorization", ApiKey)

const url = `${baseUrl.replace(/\/+$/, '')}/v3/kv/txn${query.size > 0 ? `?${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(etcdserverpbTxnResponse, await res.json())
};