import {z} from 'zod'

export type OtlpKeyValue = {key: string, value: {stringValue?: string | undefined, intValue?: string | undefined, doubleValue?: number | undefined, boolValue?: boolean | undefined, arrayValue?: ({values?: Array<Record<string, never>> | undefined}) | undefined}};

export type OtlpSpan = {traceId: string, spanId: string, parentSpanId?: string | undefined, name: string, kind?: (0 | 1 | 2 | 3 | 4 | 5) | undefined, startTimeUnixNano: string, endTimeUnixNano?: string | undefined, attributes?: Array<OtlpKeyValue> | undefined, status?: ({code?: (0 | 1 | 2) | undefined, message?: string | undefined}) | undefined, events?: (Array<{timeUnixNano?: string | undefined, name?: string | undefined, attributes?: Array<OtlpKeyValue> | undefined}>) | undefined, links?: (Array<{traceId?: string | undefined, spanId?: string | undefined, attributes?: Array<OtlpKeyValue> | undefined}>) | undefined};

export type OtlpExportTraceServiceRequest = {resourceSpans?: (Array<{resource?: ({attributes?: Array<OtlpKeyValue> | undefined}) | undefined, scopeSpans?: (Array<{scope?: ({name?: string | undefined, version?: string | undefined}) | undefined, spans?: Array<OtlpSpan> | undefined}>) | undefined}>) | undefined};

export type CreateApiV1TracesArgs = {'Content-Type': 'application/x-protobuf' | 'application/json', 'Content-Encoding'?: 'gzip' | undefined, close_after?: boolean | undefined, body: OtlpExportTraceServiceRequest};

export type CreateApiV1TracesOptions = {baseUrl: string, ApiKeyAuth?: string | undefined, fetch?: typeof fetch | undefined};

export const otlpExportTraceServiceResponse = z.object({partialSuccess: z.object({rejectedSpans: z.number().int().optional(), errorMessage: z.string().optional()}).nullable().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
};

/**
 * Ingest Traces (OTLP)
 * 
 * POST /v1/traces
 */
export const createApiV1Traces = async (args: CreateApiV1TracesArgs, options: CreateApiV1TracesOptions) => {
const {baseUrl, fetch: fetchFn = fetch, ApiKeyAuth} = options ?? {}

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

if (args['Content-Type'] != null) headers.set("Content-Type", String(args['Content-Type']))
if (args['Content-Encoding'] != null) headers.set("Content-Encoding", String(args['Content-Encoding']))
if (args.close_after != null) query.append("close_after", String(args.close_after))
if (ApiKeyAuth !== undefined) headers.set("X-API-KEY", ApiKeyAuth)

const url = `${baseUrl.replace(/\/+$/, '')}/v1/traces${query.size > 0 ? `?${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(otlpExportTraceServiceResponse, await res.json())
};