import { ProjectInfo, ProjectMember, ProjectSession } from '../types/workbench';
import { DEFAULT_PROJECTS } from '@demo-seeds';

/** Must stay in sync with STORAGE_KEYS.PROJECTS in storage.ts */
const STORAGE_KEY_PROJECTS = 'smdf_agent_workbench_v6_projects';

export { DEFAULT_PROJECTS };

/**
 * 加载项目列表
 */
export function loadProjects(fallback: ProjectInfo[] = DEFAULT_PROJECTS): ProjectInfo[] {
  try {
    const raw = localStorage.getItem(STORAGE_KEY_PROJECTS);
    if (!raw) return fallback;
    const parsed = JSON.parse(raw);
    if (!Array.isArray(parsed) || parsed.length === 0) return fallback;
    return parsed;
  } catch (err) {
    console.warn('[ProjectsStorage] 加载项目失败，回退默认基线:', err);
    return fallback;
  }
}

/**
 * 保存项目列表
 */
export function saveProjects(projects: ProjectInfo[]): void {
  try {
    localStorage.setItem(STORAGE_KEY_PROJECTS, JSON.stringify(projects));
  } catch (err) {
    console.warn('[ProjectsStorage] 保存项目失败:', err);
  }
}

/**
 * 依据项目成员身份严格过滤当前用户可见的项目会话：
 * 1. 未加入（非项目成员）：完全不可见；
 * 2. 在职成员 (active)：正常可见，可操作；
 * 3. 中途加入后已退出 (exited)：保留会话显示，附加 isExited=true 标记供界面只读留痕；
 * 4. 超级管理员 (userId === 4)：通配可见所有会话。
 */
export function filterProjectSessionsForUser(
  sessions: ProjectSession[],
  projects: ProjectInfo[],
  userId: number,
  isAdmin: boolean = false
): ProjectSession[] {
  if (isAdmin) {
    return sessions.filter((s) => s.userId === userId || s.userId == null);
  }

  const projectMap = new Map<number, ProjectInfo>();
  for (const p of projects) {
    projectMap.set(p.id, p);
  }

  const userSessions = sessions.filter((s) => s.userId === userId);

  return userSessions.filter((s) => {
    const proj = projectMap.get(s.projectId);
    if (!proj) {
      return true;
    }
    const member = proj.members.find((m) => m.userId === userId);
    if (!member) {
      return false;
    }
    if (member.status === 'exited') {
      s.isExited = true;
      return true;
    }
    s.isExited = false;
    return true;
  });
}

/**
 * 获取用户在指定项目中的成员记录
 */
export function getProjectMembership(
  project: ProjectInfo | undefined,
  userId: number
): ProjectMember | undefined {
  if (!project) return undefined;
  return project.members.find((m) => m.userId === userId);
}