const TOKEN_KEY = "sac_token";

export function getToken(): string | null {
  return localStorage.getItem(TOKEN_KEY);
}

export function setToken(token: string): void {
  localStorage.setItem(TOKEN_KEY, token);
}

export function clearToken(): void {
  localStorage.removeItem(TOKEN_KEY);
}

export async function apiFetch<T>(path: string, init: RequestInit = {}): Promise<T> {
  const headers = new Headers(init.headers);
  if (!headers.has("Content-Type") && init.body) {
    headers.set("Content-Type", "application/json");
  }
  const token = getToken();
  if (token) {
    headers.set("Authorization", `Bearer ${token}`);
  }
  const res = await fetch(path, { ...init, headers });
  if (res.status === 401) {
    clearToken();
    window.location.href = "/login";
    throw new Error("Unauthorized");
  }
  if (!res.ok) {
    const text = await res.text();
    throw new Error(text || res.statusText);
  }
  return res.json() as Promise<T>;
}

export interface TokenResponse {
  access_token: string;
  token_type: string;
}

export interface EventSummary {
  id: number;
  event_id: string;
  host_id: number;
  hostname: string;
  occurred_at: string;
  received_at: string;
  category: string;
  type: string;
  severity: string;
  title: string;
  summary: string;
}

export interface EventListResponse {
  items: EventSummary[];
  total: number;
  page: number;
  page_size: number;
}

export interface EventDetail extends EventSummary {
  details: Record<string, unknown> | null;
  raw: Record<string, unknown> | null;
  payload: Record<string, unknown>;
}

export interface HostSummary {
  id: number;
  hostname: string;
  display_name: string | null;
  os_family: string;
  product: string;
  product_version: string | null;
  ipv4: string | null;
  last_seen_at: string;
  event_count: number | null;
  last_heartbeat_at: string | null;
  last_daily_report_at: string | null;
  agent_status: "online" | "stale" | "unknown";
}

export interface HostListResponse {
  items: HostSummary[];
  total: number;
  page: number;
  page_size: number;
}

export interface ProblemSummary {
  id: number;
  host_id: number | null;
  hostname: string | null;
  title: string;
  summary: string;
  severity: string;
  status: string;
  rule_id: string | null;
  fingerprint?: string;
  event_count?: number;
  last_seen_at?: string;
  created_at: string;
  updated_at: string;
}

export interface ProblemListResponse {
  items: ProblemSummary[];
  total: number;
  page: number;
  page_size: number;
}

export interface ProblemEventItem {
  id: number;
  event_id: string;
  occurred_at: string;
  type: string;
  severity: string;
  title: string;
  summary: string;
}

export interface ProblemDetail extends ProblemSummary {
  events: ProblemEventItem[];
}

export function fetchProblem(id: number): Promise<ProblemDetail> {
  return apiFetch<ProblemDetail>(`/api/v1/problems/${id}`);
}

export async function ackProblem(problemId: number): Promise<{ id: number; status: string }> {
  return apiFetch(`/api/v1/problems/${problemId}/ack`, { method: "POST" });
}

export async function resolveProblem(problemId: number): Promise<{ id: number; status: string }> {
  return apiFetch(`/api/v1/problems/${problemId}/resolve`, { method: "POST" });
}

export interface DashboardSummary {
  events_last_24h: number;
  hosts_total: number;
  hosts_stale: number;
  heartbeats_24h: number;
  daily_reports_24h: number;
  problems_open: number;
  severity_24h: Record<string, number>;
  recent_events: EventSummary[];
}