/**
 * UserStore（规范 §131）
 *
 * 职责：
 *   - 维护 /me/status 返回的 UserState 聚合（决定路由 / 权限 / Tab）
 *   - 维护本人资料 Profile 与 PartnerPreference 缓存
 *   - 维护实名认证状态、审核状态
 *   - 关系状态切换（暂停 / 恢复 / 正在了解）
 *
 * 不变量（AGENTS.md）：
 *   - 第 8 条：敏感数据默认拒绝——Profile 中 birthDate 完整值仅服务端持有，
 *     本地缓存不存身份证号、手机号、完整生日。
 *   - 第 2 条：Required 不可自动放宽——PartnerPreference 中的 required 字段
 *     前端展示为硬约束标识，不允许任何自动软化为 preferred。
 */
const BaseStore = require('./baseStore');
const { userService, profileService, verificationService } = require('../services');
const { STORAGE_KEYS, PROFILE_COMPLETION, PROFILE_REVIEW, ACCOUNT_STATUS } = require('../constants');

class UserStore extends BaseStore {
  constructor() {
    super({
      /** @type {import('../types').UserState|null} */
      userState: null,
      /** @type {import('../types').Profile|null} */
      profile: null,
      /** @type {import('../types').PartnerPreference|null} */
      preferences: null,
      /** @type {import('../types').PrivacySettings|null} */
      privacySettings: null,
      /** @type {'idle'|'pending'|'approved'|'rejected'|'not_submitted'} */
      verificationStatus: 'not_submitted',
      /** @type {'idle'|'loading'|'error'} */
      loadStatus: 'idle',
      lastError: null,
    });
  }

  /** 冷启动从 storage 还原轻量状态，避免白屏 */
  hydrate() {
    const statusSnap = BaseStore.hydrate(STORAGE_KEYS.USER_STATUS_SNAPSHOT);
    if (statusSnap) this.setState({ userState: statusSnap });
    const profileSnap = BaseStore.hydrate(STORAGE_KEYS.CURRENT_USER_PROFILE);
    if (profileSnap) this.setState({ profile: profileSnap });
  }

  /** 拉取并缓存 /me/status（决定路由 / Tab / 权限） */
  async fetchStatus() {
    this.setState({ loadStatus: 'loading', lastError: null });
    try {
      const userState = await userService.getStatus();
      this.setState({ userState, loadStatus: 'idle' });
      this.persist(userState, STORAGE_KEYS.USER_STATUS_SNAPSHOT);
      return userState;
    } catch (err) {
      this.setState({ loadStatus: 'error', lastError: err });
      throw err;
    }
  }

  /** 拉取本人资料 */
  async fetchProfile() {
    const profile = await profileService.getProfile();
    this.setState({ profile });
    this.persist(profile, STORAGE_KEYS.CURRENT_USER_PROFILE);
    return profile;
  }

  /**
   * 更新本人资料
   * 注意：本方法不校验字数，校验由调用方（页面）按 BUSINESS_LIMITS 执行
   */
  async updateProfile(payload) {
    const profile = await profileService.updateProfile(payload);
    this.setState({ profile });
    this.persist(profile, STORAGE_KEYS.CURRENT_USER_PROFILE);
    return profile;
  }

  /** 拉取择偶条件 */
  async fetchPreferences() {
    const preferences = await profileService.getPreferences();
    this.setState({ preferences });
    return preferences;
  }

  /**
   * 更新择偶条件
   * 调用方需校验 required 字段不可自动放宽（AGENTS 第 2 条），UI 必须明确告知用户
   */
  async updatePreferences(payload) {
    const preferences = await profileService.updatePreferences(payload);
    this.setState({ preferences });
    return preferences;
  }

  /** 拉取隐私设置 */
  async fetchPrivacySettings() {
    const privacySettings = await profileService.getPrivacySettings();
    this.setState({ privacySettings });
    return privacySettings;
  }

  /** 更新隐私设置 */
  async updatePrivacySettings(payload) {
    const privacySettings = await profileService.updatePrivacySettings(payload);
    this.setState({ privacySettings });
    return privacySettings;
  }

  /** 拉取实名认证状态 */
  async fetchVerificationStatus() {
    const result = await verificationService.getStatus();
    this.setState({ verificationStatus: result.status });
    return result;
  }

  /** 提交实名认证 */
  async submitVerification(payload) {
    const result = await verificationService.submit(payload);
    this.setState({ verificationStatus: 'pending' });
    return result;
  }

  /** 拉取审核状态 */
  async fetchReviewStatus() {
    return profileService.getReviewStatus();
  }

  /**
   * 提交资料审核
   *
   * AGENTS 第 9 条：PostgreSQL 是 Source of Truth——审核状态以服务端返回为准，
   * 本地不预判结果；提交成功后同步更新 userState.profileReviewStatus 为 'pending'，
   * 以便路由守卫立即把用户引导至"审核中"页面，避免重复提交。
   *
   * @returns {Promise<{ reviewStatus: 'pending', submittedAt: number }>}
   */
  async submitReview() {
    const result = await profileService.submitReview();
    if (this.state.userState) {
      this.setState({
        userState: {
          ...this.state.userState,
          profileReviewStatus: PROFILE_REVIEW.PENDING,
          profileCompletionStatus: PROFILE_COMPLETION.COMPLETED,
        },
      });
      this.persist(this.state.userState, STORAGE_KEYS.USER_STATUS_SNAPSHOT);
    }
    return result;
  }

  /**
   * 拉取婚恋关系状态（REST §83 章）
   * 同步更新 userState.relationshipStatus / recommendationEnabled / matchingWith
   * @returns {Promise<{ status: string, recommendationEnabled: boolean, matchingWith?: object }>}
   */
  async fetchRelationshipStatus() {
    const result = await profileService.getRelationshipStatus();
    if (this.state.userState) {
      this.setState({
        userState: {
          ...this.state.userState,
          relationshipStatus: result.status,
          recommendationEnabled: result.recommendationEnabled,
          matchingWith: result.matchingWith || null,
        },
      });
      this.persist(this.state.userState, STORAGE_KEYS.USER_STATUS_SNAPSHOT);
    }
    return result;
  }

  /** 暂停寻找 */
  async pauseSearching() {
    const result = await profileService.pauseSearching();
    if (this.state.userState) {
      this.setState({
        userState: {
          ...this.state.userState,
          relationshipStatus: 'paused',
          recommendationEnabled: result.recommendationEnabled ?? false,
        },
      });
    }
    return result;
  }

  /** 恢复寻找 */
  async resumeSearching() {
    const result = await profileService.resumeSearching();
    if (this.state.userState) {
      this.setState({
        userState: {
          ...this.state.userState,
          relationshipStatus: 'searching',
          recommendationEnabled: result.recommendationEnabled ?? true,
        },
      });
    }
    return result;
  }

  /** 设置为正在了解 */
  async markGettingToKnow() {
    const result = await profileService.markGettingToKnow();
    if (this.state.userState) {
      this.setState({
        userState: {
          ...this.state.userState,
          relationshipStatus: 'getting_to_know',
          recommendationEnabled: result.recommendationEnabled ?? false,
        },
      });
    }
    return result;
  }

  // ============ 派生 getters ============
  get isLoggedIn() {
    return !!this.state.userState;
  }

  get isRealNameVerified() {
    return !!this.state.userState?.isRealNameVerified;
  }

  get isProfileCompleted() {
    return this.state.userState?.profileCompletionStatus === PROFILE_COMPLETION.COMPLETED;
  }

  get isProfileApproved() {
    return this.state.userState?.profileReviewStatus === PROFILE_REVIEW.APPROVED;
  }

  get isAccountNormal() {
    return this.state.userState?.accountStatus === ACCOUNT_STATUS.NORMAL;
  }

  /** 推荐页是否可见（综合账户态 + 隐私设置） */
  get recommendationEnabled() {
    return !!this.state.userState?.recommendationEnabled && this.isAccountNormal;
  }
}

const userStore = new UserStore();
module.exports = userStore;