/**
 * 申请页「创建 / 查看详情 / 编辑」三态通用逻辑
 *
 * 统一约定（三个提交页共用）：
 *   - 从「我的申请」「申请记录」跳转时带 mode=detail，页面按只读详情渲染；
 *   - 只有业务状态为「已驳回」（REJECTED）的申请，详情页底部才出现「编辑」；
 *   - 点「编辑」进入 mode=edit，表单可编辑，底部按钮变为「提交」；
 *   - 管理端（申请记录页）跳转带 admin=1，恒为只读，不出现「编辑」。
 *
 * 页面需要自行实现两个钩子：
 *   - fetchSourceDetail()：按来源接口拉取业务明细并回填表单（编辑态用）
 *   - submitApplication()：创建态/编辑态的提交动作
 */
import {
  adaptEssApplication,
  canEditEssApplication,
  essIdOf,
  getAdminApplicationDetail,
  getMyApplicationDetail,
} from "@/api/hr/essApplication";

export const APPLICATION_MODE = {
  CREATE: "create",
  DETAIL: "detail",
  EDIT: "edit",
};

/**
 * 解析页面参数
 * @param {object} options onLoad 收到的参数
 */
export function parseApplicationQuery(options = {}) {
  const opts = options || {};
  const raw = String(opts.mode || "").toLowerCase();
  const mode =
    raw === APPLICATION_MODE.DETAIL || raw === APPLICATION_MODE.EDIT
      ? raw
      : APPLICATION_MODE.CREATE;
  return {
    mode,
    essId: essIdOf(opts.id),
    businessId: essIdOf(opts.businessId),
    businessType: String(opts.businessType || "").toUpperCase(),
    processInstanceId: String(opts.processInstanceId || ""),
    admin: String(opts.admin || "") === "1",
  };
}

export const applicationModeMixin = {
  data() {
    return {
      appMode: APPLICATION_MODE.CREATE,
      appEssId: "",
      appBusinessId: "",
      appBusinessType: "",
      appProcessInstanceId: "",
      appAdmin: false,
      essDetail: {},
      essLoading: false,
    };
  },
  computed: {
    isCreateMode() {
      return this.appMode === APPLICATION_MODE.CREATE;
    },
    isDetailMode() {
      return this.appMode === APPLICATION_MODE.DETAIL;
    },
    isEditMode() {
      return this.appMode === APPLICATION_MODE.EDIT;
    },
    /** 详情态 = 全部字段只读 */
    isReadonly() {
      return this.isDetailMode;
    },
    /** 详情态统一申请展示结构 */
    essRow() {
      return adaptEssApplication(this.essDetail || {});
    },
    /** 仅「已驳回」且非管理端查看时可编辑 */
    canEditApplication() {
      return (
        this.isDetailMode &&
        !this.appAdmin &&
        canEditEssApplication(this.essDetail || {}, false)
      );
    },
    /** 详情态且不可编辑时，不显示底部操作条 */
    showBottomBar() {
      return this.isCreateMode || this.isEditMode || this.canEditApplication;
    },
    bottomButtonText() {
      if (this.isDetailMode) return "编辑";
      if (this.isEditMode) return "提交";
      return "提交申请";
    },
    detailNo() {
      return this.essRow.applicationNo || "—";
    },
    detailStatusLabel() {
      return this.essRow.statusLabel || "—";
    },
    detailStatusClass() {
      return this.essRow.statusClass || "pending";
    },
    detailNode() {
      return this.essRow.currentNode || "";
    },
    detailApplicant() {
      return this.essRow.applicantName || "";
    },
    detailCreatedAt() {
      return this.essRow.createdAt || "";
    },
    detailTitle() {
      return this.essRow.title || "";
    },
    /** 页面基础标题；页面通过覆盖 pageTitle 提供（如「调岗申请」） */
    pageTitle() {
      return "";
    },
    /** 详情态展示「申请人 / 所属组织」，创建态隐藏 */
    showDetailHeader() {
      return this.isDetailMode || this.isEditMode;
    },
    /** 只读态给 form 传 disabled 用的别名，避免模板里写长表达式 */
    formDisabled() {
      return this.isReadonly;
    },
  },
  methods: {
    /**
     * 在页面 onLoad 中首先调用
     * @returns {object} 解析后的参数
     */
    initApplicationMode(options = {}) {
      const query = parseApplicationQuery(options);
      this.appMode = query.mode;
      this.appEssId = query.essId;
      this.appBusinessId = query.businessId;
      this.appBusinessType = query.businessType;
      this.appProcessInstanceId = query.processInstanceId;
      this.appAdmin = query.admin;
      return query;
    },
    /** 详情/编辑态标题 */
    applicationTitle(defaultTitle) {
      const base = defaultTitle || "申请";
      if (this.isDetailMode) return `${base}详情`;
      if (this.isEditMode) return `编辑${base}`;
      return base;
    },
    applyNavigationTitle(defaultTitle) {
      uni.setNavigationBarTitle({ title: this.applicationTitle(defaultTitle) });
    },
    /**
     * 拉取统一申请详情（管理端走 admin 接口）
     * GET /hr/ess/admin/applications/{id}  ← id 必须是 M09 申请索引主键（列表 record.id）
     */
    async loadEssDetail(loding = false) {
      if (!this.appEssId) {
        this.essDetail = {};
        return {};
      }
      this.essLoading = true;
      try {
        const detail = this.appAdmin
          ? await getAdminApplicationDetail(this.appEssId, loding)
          : await getMyApplicationDetail(this.appEssId, loding);
        this.essDetail = detail || {};
        return this.essDetail;
      } catch (error) {
        // 详情拿不到不阻断页面（业务明细仍可展示），但如实提示，不静默吞掉
        this.essDetail = {};
        console.log(
          "[统一申请详情] 加载失败:",
          this.appAdmin ? "/hr/ess/admin/applications/" : "/hr/ess/applications/",
          this.appEssId,
          (error && error.message) || error
        );
        uni.showToast({
          title: (error && error.message) || "统一申请详情加载失败",
          icon: "none",
        });
        return {};
      } finally {
        this.essLoading = false;
      }
    },
    /** 详情模式初始化：拉详情 + 业务明细（只读，不加载草稿） */
    async initDetailMode() {
      uni.showLoading({ title: "加载中..." });
      try {
        await this.loadEssDetail(false);
        await this.loadDetailBusiness();
      } catch (error) {
        // 业务明细拉取失败时保留统一申请视图（脱敏摘要 + 状态），不阻断只读展示
        uni.showToast({
          title: (error && error.message) || "申请明细加载失败",
          icon: "none",
        });
      } finally {
        uni.hideLoading();
      }
    },
    /** 只读详情需要的业务数据；页面可覆盖 */
    async loadDetailBusiness() {},
    /**
     * 点「编辑」：拉取来源业务明细回填表单后切到编辑态
     */
    async enterEditMode() {
      if (!this.canEditApplication) return;
      uni.showLoading({ title: "加载中..." });
      try {
        const businessId = this.appBusinessId || this.essRow.businessId;
        await this.fetchSourceDetail(businessId);
        this.appMode = APPLICATION_MODE.EDIT;
        this.applyNavigationTitle(this.pageTitle || "申请");
      } catch (error) {
        uni.showToast({
          title: (error && error.message) || "申请明细加载失败，无法编辑",
          icon: "none",
        });
        return;
      } finally {
        uni.hideLoading();
      }
    },
    /** 拉取来源业务明细并回填表单；页面必须实现 */
    async fetchSourceDetail() {
      throw new Error("fetchSourceDetail 未实现");
    },
    /** 底部按钮分发：详情态→编辑，创建/编辑态→提交 */
    async onBottomAction() {
      if (this.isDetailMode) return this.enterEditMode();
      return this.submitApplication();
    },
    /** 提交动作；页面必须实现 */
    async submitApplication() {
      throw new Error("submitApplication 未实现");
    },
    /** 提交成功/离开页面后回到来源列表 */
    backToApplicationList(fallbackUrl = "/pages/hr/apply/list") {
      const pages = getCurrentPages();
      if (pages && pages.length > 1) {
        uni.navigateBack({ delta: 1 });
        return;
      }
      uni.redirectTo({
        url: fallbackUrl,
        fail: () => uni.reLaunch({ url: fallbackUrl }),
      });
    },
    goBackFromApplication() {
      const pages = getCurrentPages();
      if (pages && pages.length > 1) {
        uni.navigateBack({ delta: 1 });
        return;
      }
      uni.redirectTo({ url: "/pages/index/index" });
    },
  },
};