import { computed, getCurrentInstance, reactive, ref, type Ref } from 'vue'
import { ElMessageBox } from 'element-plus'
import { onBeforeRouteLeave } from 'vue-router'
import { useUnsavedWorkRegistration } from '@/core/unsaved-work/useUnsavedWorkRegistration'
import { isWorkspaceRoute, workspaceRouteId } from '@/core/workspace-tabs/routeWorkspace'

/** Veto native closing and supplement cached route switches; retain the shared registry for other exits. */
export function useFleetDraftGuard(key: string, open: Ref<boolean>, model: object, busy: Ref<boolean>, uncertain: Ref<boolean>) {
  const baseline = ref(''), checking = ref(false)
  const snapshot = computed(() => JSON.stringify(model))
  const registration = useUnsavedWorkRegistration({ key: `${key}:${getCurrentInstance()?.uid}`, label: computed(() => '拼车表单'), isOpen: computed(() => open.value || uncertain.value), model: reactive({ form: model, uncertain }), requiredPermission: computed(() => null) })
  function capture() { baseline.value = snapshot.value; if (!uncertain.value) registration.captureBaseline() }
  async function mayClose(leaving = false) {
    if (busy.value || checking.value) return false
    if (snapshot.value !== baseline.value || uncertain.value) {
      checking.value = true
      try { await ElMessageBox.confirm(
        uncertain.value ? `上次提交结果尚未确定，原请求将保留。${leaving ? '离开' : '关闭'}后可重新打开并核对或重试，是否继续？` : leaving ? '表单有未保存内容，离开后将关闭表单并放弃本次修改。是否离开？' : '表单有未保存内容，确认放弃本次修改？',
        leaving ? '离开页面' : '关闭表单',
        { customClass: 'admin-density-confirm', confirmButtonText: leaving ? uncertain.value ? '保留请求并离开' : '放弃并离开' : '确认关闭', cancelButtonText: '继续填写' },
      ) }
      catch { return false }
      finally { checking.value = false }
    }
    return true
  }
  async function beforeClose(done: () => void) { if (await mayClose()) done() }
  if (getCurrentInstance()?.proxy?.$route) {
    onBeforeRouteLeave(async (to, from) => {
      // The global guard protects destructive navigation; it intentionally skips cached workspace switches.
      if (!isWorkspaceRoute(to) || workspaceRouteId(to) === workspaceRouteId(from) || !open.value && !uncertain.value) return true
      if (!await mayClose(true)) return false
      open.value = false
      return true
    })
  }
  return { capture, beforeClose, dirty: computed(() => snapshot.value !== baseline.value) }
}