import {z} from 'zod'

export type GetApiApiV1WorkflowsApprovalsPendingArgs = {limit?: number | undefined};

export type GetApiApiV1WorkflowsApprovalsPendingOptions = {baseUrl?: string | undefined, fetch?: typeof fetch | undefined};

export const pendingApproval = z.object({workflow_id: z.string().optional(), workflow_name: z.string().optional(), plan_id: z.string().optional(), step_id: z.string().optional(), step_index: z.number().int().optional(), step_name: z.string().optional(), step_type: z.enum(["llm_call", "tool_call", "connector_call", "human_task", "synthesis", "action", "gate"]).optional(), decision: z.enum(["allow", "block", "require_approval"]).optional(), decision_reason: z.string().optional(), policies_matched: z.array(z.object({})).optional(), step_input: z.object({}).optional(), approval_status: z.enum(["pending", "approved", "rejected"]).optional(), created_at: z.string().optional()});

export const pendingApprovalsResponse = z.object({pending_approvals: z.array(pendingApproval).optional(), count: z.number().int().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
};

/**
 * List pending approvals (WCP plane)
 * 
 * GET /api/v1/workflows/approvals/pending
 */
export const getApiApiV1WorkflowsApprovalsPending = async (args: GetApiApiV1WorkflowsApprovalsPendingArgs, options?: GetApiApiV1WorkflowsApprovalsPendingOptions) => {
const {baseUrl = "https://orchestrator.getaxonflow.com", fetch: fetchFn = fetch} = options ?? {}

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

if (args.limit != null) query.append("limit", String(args.limit))

const url = `${baseUrl.replace(/\/+$/, '')}/api/v1/workflows/approvals/pending${query.size > 0 ? `?${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(pendingApprovalsResponse, await res.json())
};