import { defineStore } from "pinia";
import { ref } from "vue";
import { fetchStudies } from "../api/studies";
import type { Study } from "../types/api";

const STUDY_KEY = "ctms_current_study";
const STUDY_ROLE_KEY = "ctms_current_study_role";
const SITE_KEY = "ctms_current_site";

export const useStudyStore = defineStore("study", () => {
  const currentStudy = ref<Study | null>(null);
  const currentStudyRole = ref<string | null>(null);
  const currentSite = ref<any | null>(null);
  const viewContext = ref<{ siteName?: string } | null>(null);

  const setCurrentStudy = (study: Study) => {
    currentStudy.value = study;
    currentSite.value = null; // 切换项目时清空中心
    localStorage.removeItem(SITE_KEY);
    currentStudy.value = study;
    const role = (study as any).role_in_study || (study as any).role || null;
    currentStudyRole.value = role;
    localStorage.setItem(STUDY_KEY, JSON.stringify(study));
    if (role) {
      localStorage.setItem(STUDY_ROLE_KEY, role);
    }
  };

  const loadCurrentStudy = () => {
    const raw = localStorage.getItem(STUDY_KEY);
    if (raw) {
      try {
        currentStudy.value = JSON.parse(raw) as Study;
      } catch {
        currentStudy.value = null;
      }
    }
    const savedRole = localStorage.getItem(STUDY_ROLE_KEY);
    currentStudyRole.value = savedRole || null;

    const savedSite = localStorage.getItem(SITE_KEY);
    if (savedSite) {
      try {
        currentSite.value = JSON.parse(savedSite);
      } catch {
        currentSite.value = null;
      }
    }
  };

  const ensureDefaultStudy = async () => {
    if (currentStudy.value) return currentStudy.value;
    try {
      const { data } = await fetchStudies();
      const items = (data as any).items || [];
      if (items.length) {
        setCurrentStudy(items[0] as Study);
        return items[0] as Study;
      }
    } catch {
      return null;
    }
    return null;
  };

  const ensureDefaultActiveStudy = async () => {
    if (currentStudy.value) return currentStudy.value;
    try {
      const { data } = await fetchStudies();
      const items = (data as any).items || [];
      const active = items.find((study: Study) => study.status === "ACTIVE" && !study.is_locked);
      if (active) {
        setCurrentStudy(active as Study);
        return active as Study;
      }
    } catch {
      return null;
    }
    return null;
  };

  const clearCurrentStudy = () => {
    currentStudy.value = null;
    currentStudyRole.value = null;
    currentSite.value = null;
    viewContext.value = null;
    localStorage.removeItem(STUDY_KEY);
    localStorage.removeItem(STUDY_ROLE_KEY);
    localStorage.removeItem(SITE_KEY);
  };

  const setCurrentStudyRole = (role: string | null) => {
    currentStudyRole.value = role;
    if (role) {
      localStorage.setItem(STUDY_ROLE_KEY, role);
    } else {
      localStorage.removeItem(STUDY_ROLE_KEY);
    }
  };

  const setCurrentSite = (site: any | null) => {
    currentSite.value = site;
    if (site) {
      localStorage.setItem(SITE_KEY, JSON.stringify(site));
    } else {
      localStorage.removeItem(SITE_KEY);
    }
  };

  const setViewContext = (ctx: { siteName?: string } | null) => {
    viewContext.value = ctx;
  };

  return {
    currentStudy,
    currentStudyRole,
    currentSite,
    viewContext,
    setCurrentStudy,
    setCurrentStudyRole,
    setCurrentSite,
    setViewContext,
    loadCurrentStudy,
    ensureDefaultStudy,
    ensureDefaultActiveStudy,
    clearCurrentStudy,
  };
});