import { createSeedData } from "./data";
import type { HubApp, HubData } from "./types";

const DATA_KEY = "glm-hub:state:v1";

export interface LoadDataResult {
  data: HubData;
  warning: string;
}

function isHubApp(value: unknown): value is HubApp {
  if (!value || typeof value !== "object") return false;
  const app = value as Partial<HubApp>;
  return (
    typeof app.id === "string" &&
    typeof app.name === "string" &&
    typeof app.description === "string" &&
    typeof app.category === "string" &&
    Array.isArray(app.keywords) &&
    typeof app.url === "string" &&
    typeof app.mark === "string" &&
    typeof app.accent === "string" &&
    typeof app.iconDataUrl === "string" &&
    (app.visibility === "published" || app.visibility === "hidden")
  );
}

function isHubData(value: unknown): value is HubData {
  if (!value || typeof value !== "object") return false;
  const data = value as Partial<HubData>;
  return (
    data.schemaVersion === 1 &&
    Array.isArray(data.apps) &&
    data.apps.every(isHubApp) &&
    !!data.favoritesByUser &&
    typeof data.favoritesByUser === "object" &&
    !!data.recentByUser &&
    typeof data.recentByUser === "object"
  );
}

function keepExistingAppIds(groups: Record<string, string[]>, appIds: Set<string>): Record<string, string[]> {
  return Object.fromEntries(
    Object.entries(groups).map(([userId, ids]) => [userId, ids.filter((id) => appIds.has(id))]),
  );
}

function migrateCategory(category: string): HubApp["category"] {
  switch (category) {
    case "Administración":
    case "Recursos Humanos":
    case "CDC":
      return category;
    case "Recursos":
      return "Recursos Humanos";
    case "Clientes":
    case "Creatividad":
      return "CDC";
    case "Operaciones":
    case "Analítica":
    default:
      return "Administración";
  }
}

function migrateAppCategories(data: HubData): HubData {
  let changed = false;
  const apps = data.apps.map((app) => {
    const category = migrateCategory(app.category);
    if (category === app.category) return app;
    changed = true;
    return { ...app, category };
  });

  return changed
    ? { ...data, apps, updatedAt: new Date().toISOString() }
    : data;
}

function removeAppsWithoutLogo(data: HubData): HubData {
  const apps = data.apps.filter((app) => Boolean(app.iconDataUrl.trim()));
  if (apps.length === data.apps.length) return data;

  const appIds = new Set(apps.map((app) => app.id));
  return {
    ...data,
    apps,
    favoritesByUser: keepExistingAppIds(data.favoritesByUser, appIds),
    recentByUser: keepExistingAppIds(data.recentByUser, appIds),
    updatedAt: new Date().toISOString(),
  };
}

export function loadHubData(): LoadDataResult {
  const fallback = createSeedData();

  try {
    const raw = localStorage.getItem(DATA_KEY);
    if (!raw) {
      localStorage.setItem(DATA_KEY, JSON.stringify(fallback));
      return { data: fallback, warning: "" };
    }

    const parsed: unknown = JSON.parse(raw);
    if (!isHubData(parsed)) {
      localStorage.setItem(`${DATA_KEY}:backup`, raw);
      localStorage.setItem(DATA_KEY, JSON.stringify(fallback));
      return {
        data: fallback,
        warning: "Los datos locales no eran válidos. Restauramos el catálogo inicial.",
      };
    }

    const migrated = migrateAppCategories(parsed);
    const cleaned = removeAppsWithoutLogo(migrated);
    if (cleaned !== parsed) {
      localStorage.setItem(DATA_KEY, JSON.stringify(cleaned));
    }
    return { data: cleaned, warning: "" };
  } catch {
    return {
      data: fallback,
      warning: "No pudimos leer los datos guardados. Estás viendo el catálogo inicial.",
    };
  }
}

export function saveHubData(data: HubData): { ok: boolean; error: string } {
  try {
    localStorage.setItem(DATA_KEY, JSON.stringify(data));
    return { ok: true, error: "" };
  } catch (error) {
    const isQuota =
      error instanceof DOMException &&
      (error.name === "QuotaExceededError" || error.name === "NS_ERROR_DOM_QUOTA_REACHED");
    return {
      ok: false,
      error: isQuota
        ? "El almacenamiento está lleno. Prueba con un logo más liviano."
        : "No pudimos guardar los cambios en este navegador.",
    };
  }
}

export function resetHubData(): HubData {
  const next = createSeedData();
  localStorage.setItem(DATA_KEY, JSON.stringify(next));
  return next;
}

export function normalizeSearch(value: string): string {
  return value
    .normalize("NFD")
    .replace(/[\u0300-\u036f]/g, "")
    .toLocaleLowerCase("es-DO")
    .trim();
}

export function getSafeUrl(value: string): string | null {
  if (!value.trim()) return null;
  try {
    const url = new URL(value.trim());
    const isLocalHttp =
      url.protocol === "http:" && (url.hostname === "localhost" || url.hostname === "127.0.0.1");
    if (url.protocol !== "https:" && !isLocalHttp) return null;
    if (url.username || url.password) return null;
    return url.toString();
  } catch {
    return null;
  }
}