// Typed client for the Case Zero game API (served by gradio.Server under /api).
import type { InterrogateResult, PublicCase, VerdictResult } from './types'

export interface CaseResponse {
  caseId: string
  runId: string
  case: PublicCase
}

async function postJSON<T>(url: string, body: unknown): Promise<T> {
  const res = await fetch(url, {
    method: 'POST',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify(body),
  })
  if (!res.ok) throw new Error(`POST ${url} failed: ${res.status}`)
  return (await res.json()) as T
}

async function getJSON<T>(url: string): Promise<T> {
  const res = await fetch(url)
  if (!res.ok) throw new Error(`GET ${url} failed: ${res.status}`)
  return (await res.json()) as T
}

export interface NewCaseRequest {
  seed?: number
  caseId?: string
  difficulty?: string
}

export function newCase(req: NewCaseRequest = {}): Promise<CaseResponse> {
  return postJSON<CaseResponse>('/api/case', req)
}

export function getCase(caseId: string): Promise<CaseResponse> {
  return getJSON<CaseResponse>(`/api/case/${encodeURIComponent(caseId)}`)
}

export interface InterrogateBody {
  questionId?: string
  freeText?: string
  presentEvidenceId?: string
}

export function interrogate(
  runId: string,
  suspectId: string,
  body: InterrogateBody,
): Promise<InterrogateResult> {
  return postJSON<InterrogateResult>(
    `/api/run/${encodeURIComponent(runId)}/interrogate/${encodeURIComponent(suspectId)}`,
    body,
  )
}

export function getHint(runId: string, screen: string): Promise<{ hint: string }> {
  return getJSON<{ hint: string }>(
    `/api/run/${encodeURIComponent(runId)}/hint?screen=${encodeURIComponent(screen)}`,
  )
}

export interface AccuseBody {
  suspectId: string
  motiveId: string
  evidenceIds: string[]
}

export function accuse(runId: string, body: AccuseBody): Promise<VerdictResult> {
  return postJSON<VerdictResult>(`/api/run/${encodeURIComponent(runId)}/accuse`, body)
}