import {z} from 'zod'

export type RecordSchema = Array<{name?: string | undefined, type?: string | undefined}>;

export type PhysicalField = {kind: 'physical', name?: string | undefined, type?: string | undefined};

export type ComputedField = {kind: 'computed', name?: string | undefined, expression?: string | undefined};

export type MetadataField = {kind: 'metadata', name?: string | undefined, type?: string | undefined, key?: string | undefined};

export type SchemaV2 = {fields?: (Array<PhysicalField | ComputedField | MetadataField>) | undefined, watermarks?: (Array<{name?: string | undefined, expression?: string | undefined}>) | undefined, constraints?: ({primary_key?: Array<string> | undefined}) | undefined};

export type CreateApiStreamsIdCompatibilityArgs = {body: {schema: RecordSchema, schema_v2?: SchemaV2 | undefined, side?: ('LEFT' | 'RIGHT') | undefined} | {schema?: RecordSchema | undefined, schema_v2: SchemaV2, side?: ('LEFT' | 'RIGHT') | undefined}};

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

export const streamCompatibility = z.object({compatible: z.boolean(), error: 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
};

/**
 * Check if a given schema is compatible with a stream.
 * 
 * POST /streams/{id}/compatibility
 * 
 * Also accepts auth: oauth2
 */
export const createApiStreamsIdCompatibility = async (args: CreateApiStreamsIdCompatibilityArgs, options?: CreateApiStreamsIdCompatibilityOptions) => {
const {baseUrl = "https://replace-with-account.api.decodable.co/v1alpha2", fetch: fetchFn = fetch, bearerAuth} = options ?? {}

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

if (bearerAuth !== undefined) headers.set('authorization', `Bearer ${bearerAuth}`)

const url = `${baseUrl.replace(/\/+$/, '')}/streams/${encodeURIComponent(String(args.id))}/compatibility${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(streamCompatibility, await res.json())
};