import {z} from 'zod'

export type TraceKind = 'decision' | 'retrieval' | 'response';

export type GetApiApiV1ContextIdAuditArgs = {context_id: string, principal?: string | undefined, key?: string | undefined, kind?: TraceKind | undefined, since?: string | undefined, until?: string | undefined, limit?: number | undefined, cursor?: string | undefined};

export type GetApiApiV1ContextIdAuditOptions = {baseUrl: string, apiKey?: string | undefined, fetch?: typeof fetch | undefined};

export const pageMeta = z.object({hasMore: z.boolean(), nextCursor: z.string().nullable().optional(), totalSize: z.number().int().gte(0).nullable().optional()});

export const traceKind = z.enum(["decision", "retrieval", "response"]);

export const auditRowJson = z.object({cost: z.number(), createdAt: z.string(), kind: traceKind, latencyMs: z.number().int(), model: z.string().nullable().optional(), principal: z.string().nullable().optional(), rowsTouched: z.number().int(), traceId: z.string()});

export const auditResponseJson = z.object({page: pageMeta, rows: z.array(auditRowJson)});

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
};

/**
 * Audit view over the trace graph. Returns recent traces with principal/key/time/kind filters.
 * 
 * GET /api/v1/{context_id}/audit
 */
export const getApiApiV1ContextIdAudit = async (args: GetApiApiV1ContextIdAuditArgs, options: GetApiApiV1ContextIdAuditOptions) => {
const {baseUrl, fetch: fetchFn = fetch, apiKey} = options ?? {}

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

if (args.principal != null) query.append("principal", String(args.principal))
if (args.key != null) query.append("key", String(args.key))
if (args.kind != null) query.append("kind", String(args.kind))
if (args.since != null) query.append("since", String(args.since))
if (args.until != null) query.append("until", String(args.until))
if (args.limit != null) query.append("limit", String(args.limit))
if (args.cursor != null) query.append("cursor", String(args.cursor))
if (apiKey !== undefined) headers.set('authorization', `Bearer ${apiKey}`)

const url = `${baseUrl.replace(/\/+$/, '')}/api/v1/${encodeURIComponent(String(args.context_id))}/audit${query.size > 0 ? `?${query}` : ''}`

const res = await fetchFn(url, {method: "GET", headers})

if (!res.ok) throw new Error(`Request failed with status ${res.status}`, {cause: {status: res.status, body: await res.text()}})

return validateResponse(auditResponseJson, await res.json())
};