"use client";
import { useEffect, useState } from "react";
import { useAuth } from "@/hooks/useAuth";
import { api, type Report } from "@/lib/api";
import Sidebar from "@/components/Sidebar";
import { FileText, Download, RefreshCw } from "lucide-react";

export default function ReportsPage() {
  const { tenantId, role, ready } = useAuth();
  const [reports, setReports] = useState<Report[]>([]);
  const [loading, setLoading] = useState(true);
  const [error, setError] = useState("");
  const [downloadingId, setDownloadingId] = useState<string | null>(null);
  const [snapshotting, setSnapshotting] = useState(false);

  useEffect(() => {
    if (!ready || !tenantId) return;
    api.reports(tenantId)
      .then(setReports)
      .catch(e => setError(e.message))
      .finally(() => setLoading(false));
  }, [ready, tenantId]);

  async function handleDownload(id: string) {
    setDownloadingId(id);
    try {
      await api.downloadReportPdf(id);
    } catch (e: any) {
      setError(e.message || "Download failed");
    } finally {
      setDownloadingId(null);
    }
  }

  async function handleSnapshot() {
    if (!tenantId) return;
    setSnapshotting(true);
    try {
      await api.downloadPdfSnapshot(tenantId);
    } catch (e: any) {
      setError(e.message || "Snapshot failed");
    } finally {
      setSnapshotting(false);
    }
  }

  const canSnapshot = role === "it_admin" || role === "trustos_admin";

  return (
    <div className="flex min-h-screen bg-vault-black">
      <Sidebar />
      <main className="ml-64 flex-1 p-8">
        <div className="mb-6 flex items-center justify-between">
          <div>
            <h1 className="text-2xl font-bold text-vault-text flex items-center gap-2">
              <FileText className="w-6 h-6 text-vault-sapphire" />
              Vault Audit Reports
            </h1>
            <p className="text-vault-muted text-sm mt-1">Point-in-time baseline reports and audit deliverables</p>
          </div>
          {canSnapshot && (
            <button onClick={handleSnapshot} disabled={snapshotting} className="btn-primary">
              {snapshotting
                ? <><RefreshCw className="w-4 h-4 animate-spin" /> Building PDF…</>
                : <><Download className="w-4 h-4" /> Current Posture PDF</>}
            </button>
          )}
        </div>

        {error && (
          <div className="vault-card border-vault-crimson/40 bg-vault-crimsonDim/30 text-red-300 text-sm mb-6 py-3">
            {error}
          </div>
        )}

        {loading ? (
          <div className="flex items-center justify-center h-40">
            <div className="animate-spin w-6 h-6 border-2 border-vault-sapphire border-t-transparent rounded-full" />
          </div>
        ) : reports.length === 0 ? (
          <div className="vault-card text-center py-12">
            <FileText className="w-8 h-8 text-vault-muted mx-auto mb-3" />
            <p className="text-vault-text font-semibold">No audit reports yet</p>
            <p className="text-vault-muted text-sm mt-1">
              {role === "trustos_admin"
                ? "Generate the first Vault Audit from the Admin Panel."
                : "Your TrustOS administrator will publish audit reports here."}
            </p>
          </div>
        ) : (
          <div className="space-y-4">
            {reports.map(r => (
              <div key={r.id} className="vault-card">
                <div className="flex items-start justify-between gap-4">
                  <div className="flex-1">
                    <div className="flex items-center gap-2 mb-1">
                      {r.is_baseline && (
                        <span className="vault-badge-info text-xs">Baseline</span>
                      )}
                      <p className="text-vault-text font-semibold">{r.title}</p>
                    </div>
                    <p className="text-vault-muted text-xs">
                      {new Date(r.report_date).toLocaleDateString("en-US", { year: "numeric", month: "long", day: "numeric" })}
                      {r.baseline_score != null && ` · Score at audit: ${Math.round(r.baseline_score)}`}
                    </p>
                    {r.executive_summary && (
                      <p className="text-vault-subtle text-sm mt-2 leading-relaxed line-clamp-2">{r.executive_summary}</p>
                    )}
                  </div>
                  <button
                    onClick={() => handleDownload(r.id)}
                    disabled={downloadingId === r.id}
                    className="btn-ghost border border-vault-border rounded-lg flex-shrink-0"
                  >
                    {downloadingId === r.id
                      ? <><RefreshCw className="w-4 h-4 animate-spin" /> Preparing…</>
                      : <><Download className="w-4 h-4" /> Download PDF</>}
                  </button>
                </div>
              </div>
            ))}
          </div>
        )}
      </main>
    </div>
  );
}