import { BookOpen, UserX } from "lucide-react"
import { getTranslations } from "next-intl/server"

import { getTextbooksWithScope } from "@/modules/textbooks/data-access"
import { TextbookCard } from "@/modules/textbooks/components/textbook-card"
import { TextbookFilters } from "@/modules/textbooks/components/textbook-filters"
import { getCurrentStudentUser } from "@/modules/users/data-access"
import { getGradeNameById } from "@/modules/school/data-access"
import { EmptyState } from "@/shared/components/ui/empty-state"

export const dynamic = "force-dynamic"

type SearchParams = { [key: string]: string | string[] | undefined }

const getParam = (params: SearchParams, key: string): string | undefined => {
  const v = params[key]
  return Array.isArray(v) ? v[0] : v
}

export default async function StudentTextbooksPage({
  searchParams,
}: {
  searchParams: Promise<SearchParams>
}) {
  const t = await getTranslations("textbooks")
  const [student, sp] = await Promise.all([getCurrentStudentUser(), searchParams])

  if (!student) {
    return (
      <div className="space-y-8">
        <EmptyState
          title={t("student.noUser")}
          description={t("student.noUserDesc")}
          icon={UserX}
        />
      </div>
    )
  }

  const q = getParam(sp, "q")
  const subject = getParam(sp, "subject")
  const grade = getParam(sp, "grade")

  // P1-1 数据范围过滤：学生端强制按学生所在年级过滤
  // student.gradeId 是 grades 表 id，需通过 getGradeNameById 解析为年级名称（如 "Grade 7"），
  // 才能与 textbooks.grade 字符串字段匹配
  const studentGradeName = student.gradeId ? await getGradeNameById(student.gradeId) : null
  const textbooks = await getTextbooksWithScope(q, subject, grade, {
    grade: studentGradeName ?? undefined,
  })
  const hasFilters = Boolean(q || (subject && subject !== "all") || (grade && grade !== "all"))

  return (
    <div className="space-y-8">
      <div>
        <h2 className="text-2xl font-bold tracking-tight">{t("student.list.title")}</h2>
        <p className="text-muted-foreground">{t("student.list.subtitle")}</p>
      </div>

      <TextbookFilters />

      {textbooks.length === 0 ? (
        <EmptyState
          icon={BookOpen}
          title={hasFilters ? t("student.list.empty.withFilters") : t("student.list.empty.withoutFilters")}
          description={
            hasFilters
              ? t("student.list.empty.withFiltersDesc")
              : t("student.list.empty.withoutFiltersDesc")
          }
          action={
            hasFilters
              ? { label: t("list.clearFilters"), href: "/student/learning/textbooks" }
              : undefined
          }
          className="bg-card"
        />
      ) : (
        <div className="grid grid-cols-1 gap-6 sm:grid-cols-2 lg:grid-cols-3 xl:grid-cols-4">
          {textbooks.map((textbook) => (
            <TextbookCard
              key={textbook.id}
              textbook={textbook}
              hrefBase="/student/learning/textbooks"
              hideActions
            />
          ))}
        </div>
      )}
    </div>
  )
}