import {
  createDefaultCVData,
  type CVCareerData,
} from "@/lib/types/cv";

export const STORAGE_KEY = "cv-maker:v1";

export interface CVStorageAdapter {
  load(): CVCareerData | null;
  save(data: CVCareerData): void;
  clear(): void;
}

export function isCVCareerData(value: unknown): value is CVCareerData {
  if (typeof value !== "object" || value === null) return false;
  const data = value as Record<string, unknown>;
  if (data.version !== 1) return false;
  if (!Array.isArray(data.experiences)) return false;
  return true;
}

export function normalizeCVCareerData(value: unknown): CVCareerData | null {
  if (!isCVCareerData(value)) return null;
  return { ...createDefaultCVData(), ...value, experiences: value.experiences };
}

export function createLocalStorageAdapter(): CVStorageAdapter {
  return {
    load() {
      try {
        const raw = window.localStorage.getItem(STORAGE_KEY);
        if (raw === null) return null;
        const parsed: unknown = JSON.parse(raw);
        return normalizeCVCareerData(parsed);
      } catch {
        return null;
      }
    },
    save(data) {
      try {
        window.localStorage.setItem(STORAGE_KEY, JSON.stringify(data));
      } catch (error) {
        console.warn("Échec de la sauvegarde localStorage", error);
        throw error;
      }
    },
    clear() {
      window.localStorage.removeItem(STORAGE_KEY);
    },
  };
}

export const localStorageAdapter = createLocalStorageAdapter();