import {z} from 'zod'

export type MeteringEvent = {transactionId: string, payload: string, sourceId?: string | undefined, subscriberCredentialId?: string | undefined, sourceType: 'UNKNOWN' | 'AI' | 'SDK_PYTHON' | 'SDK_JS' | 'SDK_JVM' | 'SDK_SPRING' | 'SDK_DOTNET' | 'SDK_GOLANG' | 'SDK_RUST' | 'EBPF' | 'AWS' | 'AZURE' | 'SNOWFLAKE' | 'KONG' | 'GRAVITEE' | 'MULESOFT' | 'BOOMI' | 'REVENIUM' | 'INTERNAL'};

export type CreateApiV2EventsArgs = {body: MeteringEvent};

export type CreateApiV2EventsOptions = {baseUrl?: string | undefined, xApiKey?: string | undefined, fetch?: typeof fetch | undefined};

export const link = z.object({href: z.string().optional(), hreflang: z.string().optional(), title: z.string().optional(), type: z.string().optional(), deprecation: z.string().optional(), profile: z.string().optional(), name: z.string().optional(), templated: z.boolean().optional()});

export const links = z.record(z.string(), link);

export const meteringResponseResource = z.object({object: z.string(), label: z.string(), created: z.string().optional(), updated: z.string().optional(), id: z.string(), signature: z.string(), _links: links.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
};

/**
 * Meter an event
 * 
 * POST /v2/events
 */
export const createApiV2Events = async (args: CreateApiV2EventsArgs, options?: CreateApiV2EventsOptions) => {
const {baseUrl = "https://api.revenium.io/meter", fetch: fetchFn = fetch, xApiKey} = options ?? {}

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

if (xApiKey !== undefined) headers.set("x-api-key", xApiKey)

const url = `${baseUrl.replace(/\/+$/, '')}/v2/events${query.size > 0 ? `?${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(meteringResponseResource, await res.json())
};