import { Head, Link } from '@inertiajs/react';
import { format } from 'date-fns';
import { ArrowLeft } from 'lucide-react';
import { PageHeader } from '@/components/page-header';
import { Badge } from '@/components/ui/badge';
import { Button } from '@/components/ui/button';
import { Card, CardContent, CardHeader, CardTitle } from '@/components/ui/card';
import { index as courseRegistrationIndex } from '@/routes/admin/manage/course-registrations';
import { formatAcademicTermLabel } from '@/types/academic-term';
import type { CourseRegistrationSubmission } from '@/types/course-registration';
import { RegistrationStatusLabels } from '@/types/course-registration';

type Props = {
    submission: CourseRegistrationSubmission;
};

export default function CourseRegistrationShow({ submission }: Props) {
    const student = submission.student;

    return (
        <>
            <Head title="Detail Registrasi KRS" />

            <div className="flex h-full flex-1 flex-col gap-6 overflow-x-auto p-4 md:p-6">
                <PageHeader
                    title="Detail Registrasi KRS"
                    actions={
                        <Button variant="outline" asChild>
                            <Link href={courseRegistrationIndex.url()}>
                                <ArrowLeft className="h-4 w-4" />
                                Kembali
                            </Link>
                        </Button>
                    }
                />

                <Card>
                    <CardHeader className="flex flex-row items-start justify-between gap-4">
                        <div>
                            <CardTitle>
                                {student?.user?.profile?.full_name ?? 'N/A'}
                            </CardTitle>
                            <p className="mt-1 text-sm text-muted-foreground">
                                {student?.student_number} &middot;{' '}
                                {student?.department?.name ?? '-'} &middot;
                                Semester {student?.current_semester ?? '-'}
                            </p>
                            <p className="mt-1 text-sm text-muted-foreground">
                                Periode:{' '}
                                {submission.academic_term
                                    ? formatAcademicTermLabel(
                                          submission.academic_term,
                                      )
                                    : '-'}
                            </p>
                        </div>
                        <Badge
                            variant={
                                submission.status === 'approved'
                                    ? 'default'
                                    : submission.status === 'rejected'
                                      ? 'destructive'
                                      : 'outline'
                            }
                        >
                            {RegistrationStatusLabels[submission.status]}
                        </Badge>
                    </CardHeader>
                </Card>

                <Card>
                    <CardHeader>
                        <CardTitle className="text-base">
                            Tanda Tangan
                        </CardTitle>
                    </CardHeader>
                    <CardContent>
                        {submission.signature_url ? (
                            <div className="w-fit rounded-md border bg-white p-2">
                                <img
                                    src={submission.signature_url}
                                    alt="Tanda tangan"
                                    className="h-24"
                                />
                            </div>
                        ) : (
                            <p className="text-sm text-muted-foreground">
                                Tidak ada tanda tangan.
                            </p>
                        )}
                        <p className="mt-2 text-xs text-muted-foreground">
                            Ditandatangani pada{' '}
                            {format(
                                new Date(submission.signed_at),
                                'd MMM yyyy, HH:mm',
                            )}
                        </p>
                    </CardContent>
                </Card>

                <Card>
                    <CardHeader>
                        <CardTitle className="text-base">
                            Mata Kuliah (
                            {submission.course_registrations.length})
                        </CardTitle>
                    </CardHeader>
                    <CardContent className="grid gap-2">
                        {submission.course_registrations.map((registration) => (
                            <div
                                key={registration.id}
                                className="rounded-md border p-3"
                            >
                                <p className="font-medium">
                                    {registration.course_class?.course?.name ??
                                        'N/A'}
                                </p>
                                <p className="text-xs text-muted-foreground">
                                    {registration.course_class?.course?.code ??
                                        '-'}
                                </p>
                            </div>
                        ))}
                    </CardContent>
                </Card>

                <Card>
                    <CardHeader>
                        <CardTitle className="text-base">Riwayat</CardTitle>
                    </CardHeader>
                    <CardContent className="grid gap-2">
                        {submission.logs.map((log, index) => (
                            <LogBubble
                                key={log.id}
                                log={log}
                                isResubmission={
                                    log.status === 'submitted' &&
                                    submission.logs
                                        .slice(0, index)
                                        .some((l) => l.status === 'submitted')
                                }
                            />
                        ))}
                    </CardContent>
                </Card>
            </div>
        </>
    );
}

function LogBubble({
    log,
    isResubmission,
}: {
    log: CourseRegistrationSubmission['logs'][number];
    isResubmission: boolean;
}) {
    const actorName = log.actor?.profile?.full_name ?? 'Sistem';

    const message =
        log.status === 'approved'
            ? `${actorName} menyetujui KRS ini.`
            : log.status === 'rejected'
              ? `${actorName} menolak KRS ini dengan alasan: "${log.reason}"`
              : isResubmission
                ? `${actorName} mengajukan ulang KRS.`
                : `${actorName} mengajukan KRS.`;

    const colorClasses =
        log.status === 'approved'
            ? 'border-primary/30 bg-primary/10'
            : log.status === 'rejected'
              ? 'border-destructive/30 bg-destructive/10'
              : 'border-border bg-muted';

    return (
        <div className={`rounded-lg border px-3 py-2 ${colorClasses}`}>
            <p className="text-sm">{message}</p>
            <p className="mt-1 text-xs text-muted-foreground">
                {format(new Date(log.created_at), 'd MMM yyyy, HH:mm')}
            </p>
        </div>
    );
}
