"use client";

import Link from "next/link";
import { useParams, useSearchParams } from "next/navigation";
import { useEffect, useState } from "react";
import { ReportCardGradeWindowsPanel } from "@/components/academic/ReportCardGradeWindowsPanel";
import { ReportCardsBackLink } from "@/components/academic/ReportCardsBackLink";
import { AppShell } from "@/components/app/AppShell";
import { ReportCardGradesPanel } from "@/components/report-cards/ReportCardGradesPanel";
import { ReportCardOversightPanel } from "@/components/report-cards/ReportCardOversightPanel";
import { ReportCardSettingsPanel } from "@/components/report-cards/ReportCardSettingsPanel";
import { ReportCardViewPrintPanel } from "@/components/report-cards/ReportCardViewPrintPanel";
import { Alert } from "@/components/ui/Alert";
import { PageContentSkeleton } from "@/components/ui/Skeleton";
import { ApiError, apiGet } from "@/lib/api";
import {
  canAccessAcademicAdmin,
  canManageReportCard,
  isTeacherRole,
} from "@/lib/permissions";
import {
  KIND_LABELS,
  ReportCardItem,
  ReportCardWorkspaceTab,
  WORKSPACE_TAB_LABELS,
  reportCardWorkspaceHref,
} from "@/lib/report-cards";

const ALL_TABS: ReportCardWorkspaceTab[] = ["view", "grades", "windows", "oversight", "settings"];

function tabsFor(card: ReportCardItem): ReportCardWorkspaceTab[] {
  const teacher = isTeacherRole();
  if (teacher) return ["view", "grades"];
  const tabs: ReportCardWorkspaceTab[] = ["view", "grades"];
  if (card.kind !== "composite") tabs.push("windows");
  if (canAccessAcademicAdmin()) tabs.push("oversight");
  if (canManageReportCard(card.kind)) tabs.push("settings");
  return tabs;
}

export default function ReportCardWorkspacePage() {
  const { id } = useParams<{ id: string }>();
  const searchParams = useSearchParams();
  const [card, setCard] = useState<ReportCardItem | null>(null);
  const [error, setError] = useState<string | null>(null);

  useEffect(() => {
    if (!id) return;
    apiGet<ReportCardItem>(`/report-cards/${id}`)
      .then(setCard)
      .catch((err) => setError(err instanceof ApiError ? err.message : "خطا در بارگذاری کارنامه"));
  }, [id]);

  const requested = (searchParams.get("tab") as ReportCardWorkspaceTab) || "view";
  const available = card ? tabsFor(card) : ALL_TABS;
  const tab = available.includes(requested) ? requested : available[0];

  if (!card && !error) {
    return (
      <AppShell title="کارنامه">
        <PageContentSkeleton rows={6} />
      </AppShell>
    );
  }

  if (error || !card) {
    return (
      <AppShell title="کارنامه">
        <Alert tone="error">{error ?? "کارنامه پیدا نشد."}</Alert>
      </AppShell>
    );
  }

  return (
    <AppShell
      title={card.name}
      breadcrumbLabels={{ reportCard: card.name, detail: KIND_LABELS[card.kind] }}
    >
      <div className="mb-4">
        <ReportCardsBackLink label="بازگشت به کارنامه‌ها" />
      </div>
      <div className="mb-4 flex flex-wrap gap-2 border-b border-[var(--border)] pb-2">
        {available.map((item) => (
          <Link
            key={item}
            href={reportCardWorkspaceHref(card.id, item, {
              class_id: searchParams.get("class_id"),
              subject_id: searchParams.get("subject_id"),
              period_id: searchParams.get("period_id"),
            })}
            className={`rounded-xl px-3 py-1.5 text-sm ${
              tab === item ? "bg-primary text-white" : "border border-[var(--border)] bg-white"
            }`}
          >
            {WORKSPACE_TAB_LABELS[item]}
          </Link>
        ))}
      </div>

      {tab === "view" ? <ReportCardViewPrintPanel card={card} /> : null}
      {tab === "grades" ? <ReportCardGradesPanel cardId={card.id} /> : null}
      {tab === "windows" ? (
        canManageReportCard(card.kind) ? (
          <ReportCardGradeWindowsPanel cardId={card.id} />
        ) : (
          <div className="space-y-2 rounded-2xl border border-[var(--border)] bg-white p-4 text-sm">
            <Alert tone="warning">ویرایش بازه کارنامه رسمی فقط برای مدیر کل مجاز است.</Alert>
            {(card.periods ?? []).map((period) => (
              <div key={period.id} className="rounded-xl border border-[var(--border)] p-3">
                <p className="font-medium">{period.name}</p>
                <p className="text-xs text-[var(--muted)]">
                  شروع: {period.grade_entry_starts_at ? new Date(period.grade_entry_starts_at).toLocaleString("fa-IR") : "—"}
                  {" · "}
                  پایان: {period.grade_entry_ends_at ? new Date(period.grade_entry_ends_at).toLocaleString("fa-IR") : "—"}
                </p>
              </div>
            ))}
          </div>
        )
      ) : null}
      {tab === "oversight" ? <ReportCardOversightPanel card={card} /> : null}
      {tab === "settings" ? <ReportCardSettingsPanel cardId={card.id} /> : null}
    </AppShell>
  );
}