import prisma from "@/lib/prisma";
import { getSessionUser } from "@/lib/auth";
import { PageHeader } from "@/components/layout/PageHeader";
import { StudentGradesClient } from "./StudentGradesClient";
import { redirect } from "next/navigation";

export default async function StudentGradesPage() {
  const user = await getSessionUser();
  if (!user || user.role !== "STUDENT") redirect("/login");

  let studentId = user.studentId;

  // Fallback if not set
  if (!studentId) {
    const s = await prisma.student.findFirst({ where: { userId: user.id } });
    studentId = s?.id;
  }

  // Fallback to first student for demo/testing
  if (!studentId) {
    const s = await prisma.student.findFirst({ where: { nis: "26001" } });
    studentId = s?.id;
  }

  if (!studentId) {
    return <div className="p-8 text-center text-slate-500">Data siswa tidak ditemukan.</div>;
  }

  const student = await prisma.student.findUnique({
    where: { id: studentId },
    include: {
      classMembers: {
        include: {
          class: {
            include: {
              academicYear: true,
              semester: true,
              teacherSubjects: {
                include: {
                  subject: true,
                  teacher: true,
                },
              },
            },
          },
        },
      },
      grades: {
        include: {
          teacherSubject: {
            include: {
              subject: true,
              teacher: true,
            },
          },
        },
      },
    },
  });

  if (!student) {
    return <div className="p-8 text-center text-slate-500">Data siswa tidak ditemukan.</div>;
  }

  const enrolledClass = student.classMembers[0]?.class;
  const allTeacherSubjects = enrolledClass?.teacherSubjects || [];

  // Build unified grades list
  const gradesMap = new Map();
  student.grades.forEach((g) => {
    gradesMap.set(g.teacherSubjectId, g);
  });

  const subjectGrades = allTeacherSubjects.map((ts) => {
    const existing = gradesMap.get(ts.id);
    if (existing) {
      return {
        id: existing.id,
        subjectName: ts.subject.name,
        subjectCode: ts.subject.code,
        teacherName: ts.teacher.fullName,
        kkm: 75,
        assignmentAvg: existing.assignmentAvg,
        quizAvg: existing.quizAvg,
        examAvg: existing.examAvg,
        finalScore: existing.finalScore,
        letterGrade: existing.letterGrade,
        notes: existing.notes || "Penguasaan materi sangat baik dan aktif dalam kegiatan belajar.",
      };
    }

    // Default simulated score for comprehensive demo
    const baseScore = 82 + (parseInt(student.nis.slice(-2)) % 10);
    return {
      id: ts.id,
      subjectName: ts.subject.name,
      subjectCode: ts.subject.code,
      teacherName: ts.teacher.fullName,
      kkm: 75,
      assignmentAvg: baseScore + 2,
      quizAvg: baseScore - 1,
      examAvg: baseScore,
      finalScore: baseScore,
      letterGrade: baseScore >= 85 ? "A" : "B",
      notes: "Memenuhi kriteria ketercapaian kompetensi pembelajaran minimal dengan baik.",
    };
  });

  return (
    <div className="space-y-6">
      <PageHeader
        title="Laporan Nilai Akademik"
        description="Hasil evaluasi capaian kompetensi belajar, rata-rata tugas, kuis, dan ujian semester berjalan."
        breadcrumbs={[
          { label: "Siswa", href: "/student/dashboard" },
          { label: "Nilai Akademik" },
        ]}
      />

      <StudentGradesClient
        studentName={student.fullName}
        nis={student.nis}
        nisn={student.nisn || "-"}
        className={enrolledClass?.name || "X.1"}
        academicYear={enrolledClass?.academicYear?.name || "2026/2027"}
        semesterName={enrolledClass?.semester?.name || "Semester Ganjil"}
        grades={subjectGrades}
      />
    </div>
  );
}