import {z} from 'zod'

export type Scope = {org_id: string, user_id?: (string | null) | undefined, session_id?: (string | null) | undefined};

export type IngestTurn = {text: string, role: 'user' | 'assistant', timestamp: string, observations?: Array<string> | undefined};

export type IngestMemoryOptions = {write_active?: boolean | undefined, write_passive?: boolean | undefined, ingest_mode?: ('sequential' | 'batched' | null) | undefined};

export type IngestMemoryRequest = {timezone?: (string | null) | undefined, scope: string | Scope, session_id?: (string | null) | undefined, agent_id?: (string | null) | undefined, turns: Array<IngestTurn>, supersedes?: (Array<string> | null) | undefined, options?: (IngestMemoryOptions | null) | undefined, inactivity_timeout_seconds?: (number | null) | undefined, metadata?: (Record<string, never> | null) | undefined};

export type CreateApiIngestionMemoryArgs = {body: IngestMemoryRequest};

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

export const turnTime = z.object({turn_index: z.number().int(), original: z.unknown(), timestamp: z.string(), timestamp_ms: z.number().int(), source: z.enum(["explicit", "relative", "arrival"]), uncertain: z.boolean()});

export const usage = z.object({tokens_in: z.number().int().optional(), tokens_out: z.number().int().optional()});

export const ingestMemoryResponse = z.object({turn_times: z.array(turnTime).optional(), job_id: z.string(), active_fragment_ids: z.array(z.string()).optional(), turn_ids: z.array(z.string()).optional(), not_stored_forgotten: z.array(z.string()).optional(), superseded: z.array(z.string()).optional(), supersede_errors: z.array(z.string()).optional(), passive_job_id: z.string().nullable().optional(), usage: usage.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
};

/**
 * Unified dual-write ingest (active memory + HelixDB)
 * 
 * POST /ingestion/memory
 */
export const createApiIngestionMemory = async (args: CreateApiIngestionMemoryArgs, options: CreateApiIngestionMemoryOptions) => {
const {baseUrl, fetch: fetchFn = fetch, HTTPBearer} = options ?? {}

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

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

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