/**
 * AbleSign API client — screen registration, playlist management.
 *
 * Base URL: https://api.ablesign.tv/api/v1
 * Auth: Bearer ak_... (API key from AbleSign CMS)
 *
 * The player at player.ablesign.tv uses an internal registration API
 * (POST /api/screens/registration) that doesn't need auth. We use the
 * public API (v1) with the admin's API key for all management ops, and
 * the internal player API for headless screen registration.
 */

const API_BASE = "https://api.ablesign.tv/api/v1";
const PLAYER_API = "https://api.ablesign.tv/api";

export interface AbleSignScreen {
  id: number;
  title: string;
  description?: string;
  orientation: string;
  heartbeatTime?: string;
  screenGroupId?: number;
}

export interface AbleSignPlaylistItem {
  id?: string;
  mediafileId?: string;
  webAppId?: string;
  displayDuration?: number;
  sequenceNumber?: number;
  transition?: string;
  transitionSpeedLabel?: string;
}

export interface AbleSignPlaylist {
  defaultTransition?: string;
  defaultTransitionSpeedLabel?: string;
  shufflePlay?: boolean;
  items: AbleSignPlaylistItem[];
}

export interface AbleSignRegistration {
  id: number;
  code: number;
  screenId: number;
}

interface ApiOpts {
  apiKey: string;
  workspaceId?: string;
  timeoutMs?: number;
}

function headers(opts: ApiOpts): Record<string, string> {
  const h: Record<string, string> = {
    "Authorization": `Bearer ${opts.apiKey}`,
    "Content-Type": "application/json",
    "Accept": "application/json",
  };
  if (opts.workspaceId) {
    h["Workspace-Id"] = opts.workspaceId;
  }
  return h;
}

async function apiFetch<T>(
  method: string,
  path: string,
  opts: ApiOpts,
  body?: unknown,
): Promise<T> {
  const ctrl = new AbortController();
  const t = setTimeout(() => ctrl.abort(), opts.timeoutMs ?? 10000);
  try {
    const resp = await fetch(`${API_BASE}${path}`, {
      method,
      headers: headers(opts),
      body: body ? JSON.stringify(body) : undefined,
      signal: ctrl.signal,
    });
    if (!resp.ok) {
      const text = await resp.text().catch(() => "");
      throw new Error(`AbleSign API ${method} ${path}: HTTP ${resp.status} — ${text.slice(0, 300)}`);
    }
    if (resp.status === 204) return undefined as T;
    return (await resp.json()) as T;
  } finally {
    clearTimeout(t);
  }
}

export async function listScreens(opts: ApiOpts): Promise<{ data: AbleSignScreen[]; totalItems: number }> {
  return apiFetch("GET", "/screens?limit=200", opts);
}

export async function getScreen(opts: ApiOpts, screenId: number): Promise<AbleSignScreen> {
  return apiFetch("GET", `/screens/${screenId}`, opts);
}

export async function registerScreen(
  opts: ApiOpts,
  registrationCode: string,
  title: string,
  orientation: string = "landscape",
): Promise<AbleSignScreen> {
  return apiFetch("POST", "/screens", opts, {
    registrationCode,
    title,
    orientation,
  });
}

export async function updateScreen(
  opts: ApiOpts,
  screenId: number,
  patch: { title?: string; description?: string; orientation?: string },
): Promise<void> {
  await apiFetch("PUT", `/screens/${screenId}`, opts, patch);
}

export async function deleteScreen(opts: ApiOpts, screenId: number): Promise<void> {
  await apiFetch("DELETE", `/screens/${screenId}`, opts);
}

export async function getPlaylist(opts: ApiOpts, screenId: number): Promise<AbleSignPlaylist> {
  return apiFetch("GET", `/screens/${screenId}/playlist`, opts);
}

export async function savePlaylist(
  opts: ApiOpts,
  screenId: number,
  playlist: AbleSignPlaylist,
): Promise<void> {
  await apiFetch("PUT", `/screens/${screenId}/playlist`, opts, playlist);
}

export async function addPlaylistItems(
  opts: ApiOpts,
  screenId: number,
  items: AbleSignPlaylistItem[],
  position: "start" | "end" = "end",
): Promise<void> {
  await apiFetch("POST", `/screens/${screenId}/playlist_items`, opts, { items, position });
}

export async function listWebApps(opts: ApiOpts): Promise<{ data: Array<{ id: string; title: string; url?: string }> }> {
  return apiFetch("GET", "/web_apps?limit=200", opts);
}

export async function createWebApp(
  opts: ApiOpts,
  title: string,
  url: string,
): Promise<{ id: string; title: string }> {
  return apiFetch("POST", "/web_apps", opts, { title, url });
}

export async function listMediaFiles(opts: ApiOpts): Promise<{ data: Array<{ id: string; title: string; fileType: string; thumbnailURL?: string }> }> {
  return apiFetch("GET", "/media_files?limit=200", opts);
}

/**
 * Initiate headless screen registration via the player's internal API.
 * No auth required — mimics what player.ablesign.tv does on load.
 */
export async function initiatePlayerRegistration(): Promise<AbleSignRegistration> {
  const ctrl = new AbortController();
  const t = setTimeout(() => ctrl.abort(), 10000);
  try {
    const resp = await fetch(`${PLAYER_API}/screens/registration`, {
      method: "POST",
      headers: { "Content-Type": "application/json", "x-app-version": "46" },
      body: JSON.stringify({ platformType: "Web", softwareVersionCode: 46 }),
      signal: ctrl.signal,
    });
    if (!resp.ok) throw new Error(`registration init: HTTP ${resp.status}`);
    return (await resp.json()) as AbleSignRegistration;
  } finally {
    clearTimeout(t);
  }
}

/**
 * Poll for registration completion. Returns screenId when paired, -1 while pending.
 */
export async function pollRegistration(code: number): Promise<{ screenId: number; screenToken?: string }> {
  const ctrl = new AbortController();
  const t = setTimeout(() => ctrl.abort(), 10000);
  try {
    const resp = await fetch(`${PLAYER_API}/screens/registration/${code}`, {
      method: "GET",
      headers: { "Accept": "application/json", "x-app-version": "46" },
      signal: ctrl.signal,
    });
    if (!resp.ok) throw new Error(`registration poll: HTTP ${resp.status}`);
    const data = (await resp.json()) as Record<string, unknown>;
    return { screenId: (data.screenId as number) ?? -1, screenToken: data.screenToken as string | undefined };
  } finally {
    clearTimeout(t);
  }
}

/**
 * Full headless pairing flow:
 * 1. Initiate registration → get code
 * 2. Register screen via admin API with that code
 * 3. Return screen details + any token for the player
 */
export async function headlessPairScreen(
  opts: ApiOpts,
  title: string,
  orientation: string = "landscape",
): Promise<{ screen: AbleSignScreen; registrationCode: number }> {
  const reg = await initiatePlayerRegistration();
  const screen = await registerScreen(opts, String(reg.code), title, orientation);
  return { screen, registrationCode: reg.code };
}

export async function testApiKey(apiKey: string, workspaceId?: string): Promise<{ ok: boolean; error?: string }> {
  try {
    await listScreens({ apiKey, workspaceId });
    return { ok: true };
  } catch (err) {
    return { ok: false, error: (err as Error).message };
  }
}