import type { Metadata } from "next"
import { UserX } from "lucide-react"
import { getTranslations } from "next-intl/server"

import { getStudentClasses } from "@/modules/classes/data-access"
import { getCurrentStudentUser } from "@/modules/users/data-access"
import { StudentCoursesView } from "@/modules/student/components/student-courses-view"
import { CourseFilters } from "@/modules/student/components/course-filters"
import { requirePermission } from "@/shared/lib/auth-guard"
import { Permissions } from "@/shared/types/permissions"
import { EmptyState } from "@/shared/components/ui/empty-state"
import { getParam, type SearchParams } from "@/shared/lib/search-params"

export const dynamic = "force-dynamic"

export async function generateMetadata(): Promise<Metadata> {
  const t = await getTranslations("classes")
  return {
    title: `${t("metadata.studentCourses")} - Next_Edu`,
    description: t("metadata.studentCourses"),
  }
}

export default async function StudentCoursesPage({
  searchParams,
}: {
  searchParams: Promise<SearchParams>
}) {
  const t = await getTranslations("student")
  await requirePermission(Permissions.CLASS_READ)
  const student = await getCurrentStudentUser()
  if (!student) {
    return (
      <div className="space-y-8">
        <div>
          <h2 className="text-2xl font-bold tracking-tight">{t("courses.title")}</h2>
          <p className="text-muted-foreground">{t("courses.description")}</p>
        </div>
        <EmptyState
          title={t("courses.noUser")}
          description={t("courses.noUserDesc")}
          icon={UserX}
        />
      </div>
    )
  }

  const [sp, classes] = await Promise.all([
    searchParams,
    getStudentClasses(student.id),
  ])

  const q = (getParam(sp, "q") || "").toLowerCase().trim()
  const filteredClasses = q
    ? classes.filter((c) => {
        return (
          c.name.toLowerCase().includes(q) ||
          (c.teacherName?.toLowerCase().includes(q) ?? false) ||
          (c.schoolName?.toLowerCase().includes(q) ?? false) ||
          (c.homeroom?.toLowerCase().includes(q) ?? false)
        )
      })
    : classes

  return (
    <div className="space-y-8">
      <div>
        <h2 className="text-2xl font-bold tracking-tight">{t("courses.title")}</h2>
        <p className="text-muted-foreground">{t("courses.description")}</p>
      </div>
      {classes.length > 0 && <CourseFilters />}
      <StudentCoursesView classes={filteredClasses} />
    </div>
  )
}
