export interface Workspace {
  id: string;
  name: string;
  repositories: string[];
  openPaths: string[];
  activePath: string;
}
export interface WorkspaceState {
  selectedId: string;
  workspaces: Workspace[];
  defaultSession: { openPaths: string[]; activePath: string };
}
export const WORKSPACES_KEY = "gitlite.workspaces.v1";
const paths = (value: unknown): string[] => Array.isArray(value)
  ? [...new Set(value.filter((path): path is string => typeof path === "string" && !!path.trim()))] : [];
export function readWorkspaces(storage: Pick<Storage, "getItem">, openPaths: string[]): WorkspaceState {
  const fallback: WorkspaceState = { selectedId: "", workspaces: [], defaultSession: { openPaths, activePath: "" } };
  try {
    const raw = storage.getItem(WORKSPACES_KEY);
    if (raw) {
      const saved = JSON.parse(raw);
      const workspaces: Workspace[] = Array.isArray(saved.workspaces) ? saved.workspaces.flatMap((item: any) => {
        if (!item || typeof item.id !== "string" || !item.id.startsWith("workspace-") || typeof item.name !== "string" || !item.name.trim()) return [];
        const repositories = paths(item.repositories);
        const openPaths = paths(item.openPaths).filter(path => repositories.includes(path));
        return [{ id: item.id, name: item.name, repositories, openPaths,
          activePath: openPaths.includes(item.activePath) ? item.activePath : openPaths[0] ?? "" }];
      }) : [];
      const defaultPaths = paths(saved.defaultSession?.openPaths);
      return { workspaces, selectedId: workspaces.some(item => item.id === saved.selectedId) ? saved.selectedId : "",
        defaultSession: { openPaths: defaultPaths, activePath: defaultPaths.includes(saved.defaultSession?.activePath) ? saved.defaultSession.activePath : defaultPaths[0] ?? "" } };
    }
    const legacy = JSON.parse(storage.getItem("gitty.dashboard.v1") ?? "{}");
    if (Array.isArray(legacy.workspaces)) fallback.workspaces = legacy.workspaces.flatMap((item: any) => {
      if (!item || typeof item.id !== "string" || !item.id.startsWith("workspace-") || typeof item.name !== "string" || !item.name.trim()) return [];
      const repositories = Object.entries(legacy.assignments ?? {}).filter(([, id]) => id === item.id).map(([path]) => path);
      const tabs = openPaths.filter(path => repositories.includes(path));
      return [{ ...item, repositories, openPaths: tabs, activePath: tabs[0] ?? "" }];
    });
  } catch { /* Invalid optional preferences must not block startup. */ }
  return fallback;
}