import {z} from 'zod'

export type OTLPAttributeValue = {arrayValue?: ({[key: string]: unknown} | null) | undefined, boolValue?: (boolean | null) | undefined, bytesValue?: (string | null) | undefined, doubleValue?: (number | null) | undefined, intValue?: (string | null) | undefined, stringValue?: (string | null) | undefined};

export type OTLPAttribute = {key: string, value: OTLPAttributeValue};

export type OTLPResource = {attributes?: Array<OTLPAttribute> | undefined};

export type OTLPBodyValue = {arrayValue?: ({[key: string]: unknown} | null) | undefined, boolValue?: (boolean | null) | undefined, bytesValue?: (string | null) | undefined, doubleValue?: (number | null) | undefined, intValue?: (string | null) | undefined, stringValue?: (string | null) | undefined};

export type OTLPLogRecord = {attributes?: Array<OTLPAttribute> | undefined, body?: (OTLPBodyValue | null) | undefined, severityNumber?: (number | null) | undefined, severityText?: (string | null) | undefined, spanId?: (string | null) | undefined, timeUnixNano?: string | undefined, traceId?: (string | null) | undefined};

export type OTLPScope = {name?: string | undefined, version?: string | undefined};

export type OTLPScopeLogs = {logRecords?: Array<OTLPLogRecord> | undefined, scope?: (OTLPScope | null) | undefined};

export type OTLPResourceLogs = {resource?: (OTLPResource | null) | undefined, scopeLogs?: Array<OTLPScopeLogs> | undefined};

export type OTLPLogIngestionRequest = {resourceLogs: Array<OTLPResourceLogs>};

export type CreateApiLogsOtlpArgs = {body: OTLPLogIngestionRequest};

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

export const oTLPLogIngestionResponse = z.object({logs_count: z.number().int(), status: z.string().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 Agent Logs (OTLP Format)
 * 
 * POST /logs/otlp
 */
export const createApiLogsOtlp = async (args: CreateApiLogsOtlpArgs, options: CreateApiLogsOtlpOptions) => {
const {baseUrl, fetch: fetchFn = fetch} = options ?? {}

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

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