import {z} from 'zod'

export type ScopeSets = Array<Array<string>>;

export type ContextQueryRequestJson = {k?: number | undefined, labels?: Array<string> | undefined, lens?: ScopeSets | undefined, query: string, scopeView?: (string | null) | undefined};

export type CreateApiApiV1ContextIdContextArgs = {context_id: string, body: ContextQueryRequestJson};

export type CreateApiApiV1ContextIdContextOptions = {baseUrl: string, apiKey?: string | undefined, fetch?: typeof fetch | undefined};

export const tier = z.enum(["direct", "cache", "hybrid", "escalated"]);

export const contextQueryResponseJson = z.object({context: z.string(), queryMs: z.number().int().gte(0), tier: tier});

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
};

/**
 * Query memory and return formatted context for LLM prompt injection
 * 
 * POST /api/v1/{context_id}/context
 */
export const createApiApiV1ContextIdContext = async (args: CreateApiApiV1ContextIdContextArgs, options: CreateApiApiV1ContextIdContextOptions) => {
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', `Bearer ${apiKey}`)

const url = `${baseUrl.replace(/\/+$/, '')}/api/v1/${encodeURIComponent(String(args.context_id))}/context${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(contextQueryResponseJson, await res.json())
};