import type { JSX } from "react"
import { getTranslations } from "next-intl/server"

import { requirePermission } from "@/shared/lib/auth-guard"
import { Permissions } from "@/shared/types/permissions"
import { getParam, type SearchParams } from "@/shared/lib/search-params"
import { getCoursePlans } from "@/modules/course-plans/data-access"
import { CoursePlanList } from "@/modules/course-plans/components/course-plan-list"
import { isCoursePlanStatus } from "@/modules/course-plans/types"

export const dynamic = "force-dynamic"

export default async function TeacherCoursePlansPage({
  searchParams,
}: {
  searchParams: Promise<SearchParams>
}): Promise<JSX.Element> {
  const ctx = await requirePermission(Permissions.COURSE_PLAN_READ)
  const teacherId = ctx.userId

  const t = await getTranslations("coursePlans")
  const sp = await searchParams
  const statusParam = getParam(sp, "status")
  // P1-4：使用类型守卫替代 as 断言
  const status = isCoursePlanStatus(statusParam) ? statusParam : undefined

  // P0-3：data-access 按教师范围过滤
  const plans = teacherId
    ? await getCoursePlans(
        { teacherId, status },
        { userId: teacherId, isAdmin: false, teacherId }
      )
    : []

  return (
    <div className="flex h-full flex-col space-y-8 p-8">
      <div className="space-y-1">
        <h1 className="text-2xl font-bold tracking-tight">{t("teacher.title")}</h1>
        <p className="text-muted-foreground">{t("teacher.description")}</p>
      </div>
      <CoursePlanList
        plans={plans}
        detailBaseHref="/teacher/course-plans"
        initialStatus={status}
      />
    </div>
  )
}
