/**
 * Admin content reports management page.
 *
 * Lists user-submitted issue reports with filtering by status,
 * inline triage (acknowledge/resolve/dismiss), and admin notes.
 */

import { useEffect, useState } from "react";
import {
  fetchReports,
  updateReport,
  type ContentReport,
} from "../api";
import { useDocumentTitle } from "../hooks/useDocumentTitle";

const STATUS_OPTIONS = [
  { value: "", label: "All" },
  { value: "open", label: "Open" },
  { value: "acknowledged", label: "Acknowledged" },
  { value: "resolved", label: "Resolved" },
  { value: "dismissed", label: "Dismissed" },
];

const STATUS_ACTIONS: Record<string, { label: string; next: string }[]> = {
  open: [
    { label: "Acknowledge", next: "acknowledged" },
    { label: "Resolve", next: "resolved" },
    { label: "Dismiss", next: "dismissed" },
  ],
  acknowledged: [
    { label: "Resolve", next: "resolved" },
    { label: "Dismiss", next: "dismissed" },
    { label: "Reopen", next: "open" },
  ],
  resolved: [{ label: "Reopen", next: "open" }],
  dismissed: [{ label: "Reopen", next: "open" }],
};

function formatDate(iso: string): string {
  return new Date(iso).toLocaleString(undefined, {
    month: "short",
    day: "numeric",
    hour: "2-digit",
    minute: "2-digit",
  });
}

function reportTypeLabel(rt: string): string {
  return rt.replace(/_/g, " ").replace(/^\w/, (c) => c.toUpperCase());
}

export default function AdminReports() {
  useDocumentTitle("Content Reports — Chrysopedia");
  const [reports, setReports] = useState<ContentReport[]>([]);
  const [total, setTotal] = useState(0);
  const [loading, setLoading] = useState(true);
  const [error, setError] = useState<string | null>(null);
  const [statusFilter, setStatusFilter] = useState("");
  const [expandedId, setExpandedId] = useState<string | null>(null);
  const [noteText, setNoteText] = useState("");
  const [actionLoading, setActionLoading] = useState<string | null>(null);

  const load = async () => {
    setLoading(true);
    setError(null);
    try {
      const res = await fetchReports({
        status: statusFilter || undefined,
        limit: 100,
      });
      setReports(res.items);
      setTotal(res.total);
    } catch (err) {
      setError(err instanceof Error ? err.message : "Failed to load reports");
    } finally {
      setLoading(false);
    }
  };

  useEffect(() => {
    void load();
  }, [statusFilter]);

  const handleAction = async (reportId: string, newStatus: string) => {
    setActionLoading(reportId);
    try {
      const updated = await updateReport(reportId, {
        status: newStatus,
        ...(noteText.trim() ? { admin_notes: noteText.trim() } : {}),
      });
      setReports((prev) =>
        prev.map((r) => (r.id === reportId ? updated : r)),
      );
      setNoteText("");
      if (newStatus === "resolved" || newStatus === "dismissed") {
        setExpandedId(null);
      }
    } catch (err) {
      setError(err instanceof Error ? err.message : "Action failed");
    } finally {
      setActionLoading(null);
    }
  };

  const toggleExpand = (id: string) => {
    if (expandedId === id) {
      setExpandedId(null);
      setNoteText("");
    } else {
      setExpandedId(id);
      const report = reports.find((r) => r.id === id);
      setNoteText(report?.admin_notes ?? "");
    }
  };

  return (
    <div className="admin-reports">
      <h1 className="admin-reports__title">Content Reports</h1>
      <p className="admin-reports__subtitle">
        {total} report{total !== 1 ? "s" : ""} total
      </p>

      {/* Status filter */}
      <div className="admin-reports__filters">
        <div className="sort-toggle" role="group" aria-label="Filter by status">
          {STATUS_OPTIONS.map((opt) => (
            <button
              key={opt.value}
              className={`sort-toggle__btn${statusFilter === opt.value ? " sort-toggle__btn--active" : ""}`}
              onClick={() => setStatusFilter(opt.value)}
              aria-pressed={statusFilter === opt.value}
            >
              {opt.label}
            </button>
          ))}
        </div>
      </div>

      {/* Content */}
      {loading ? (
        <div className="loading">Loading reports…</div>
      ) : error ? (
        <div className="loading error-text">Error: {error}</div>
      ) : reports.length === 0 ? (
        <div className="empty-state">
          {statusFilter ? `No ${statusFilter} reports.` : "No reports yet."}
        </div>
      ) : (
        <div className="admin-reports__list">
          {reports.map((report) => (
            <div
              key={report.id}
              className={`report-card report-card--${report.status}`}
            >
              <div
                className="report-card__header"
                onClick={() => toggleExpand(report.id)}
              >
                <div className="report-card__meta">
                  <span className={`pill pill--${report.status}`}>
                    {report.status}
                  </span>
                  <span className="pill">{reportTypeLabel(report.report_type)}</span>
                  <span className="report-card__date">
                    {formatDate(report.created_at)}
                  </span>
                </div>
                <div className="report-card__summary">
                  {report.content_title && (
                    <span className="report-card__content-title">
                      {report.content_title}
                    </span>
                  )}
                  <span className="report-card__description">
                    {report.description.length > 120
                      ? report.description.slice(0, 120) + "…"
                      : report.description}
                  </span>
                </div>
              </div>

              {expandedId === report.id && (
                <div className="report-card__detail">
                  <div className="report-card__full-description">
                    <strong>Full description:</strong>
                    <p>{report.description}</p>
                  </div>

                  {report.page_url && (
                    <div className="report-card__url">
                      <strong>Page:</strong>{" "}
                      <a href={report.page_url} target="_blank" rel="noopener noreferrer">
                        {report.page_url}
                      </a>
                    </div>
                  )}

                  <div className="report-card__info-row">
                    <span>Type: {report.content_type}</span>
                    {report.content_id && <span>ID: {report.content_id.slice(0, 8)}…</span>}
                    {report.resolved_at && (
                      <span>Resolved: {formatDate(report.resolved_at)}</span>
                    )}
                  </div>

                  {/* Admin notes */}
                  <label className="report-card__notes-label">
                    Admin notes:
                    <textarea
                      className="report-card__notes"
                      value={noteText}
                      onChange={(e) => setNoteText(e.target.value)}
                      rows={2}
                      placeholder="Add notes…"
                    />
                  </label>

                  {/* Action buttons */}
                  <div className="report-card__actions">
                    {(STATUS_ACTIONS[report.status] ?? []).map((action) => (
                      <button
                        key={action.next}
                        className={`btn btn--${action.next === "resolved" ? "primary" : action.next === "dismissed" ? "danger" : "secondary"}`}
                        onClick={() => handleAction(report.id, action.next)}
                        disabled={actionLoading === report.id}
                      >
                        {actionLoading === report.id ? "…" : action.label}
                      </button>
                    ))}
                    {noteText !== (report.admin_notes ?? "") && (
                      <button
                        className="btn btn--secondary"
                        onClick={() => handleAction(report.id, report.status)}
                        disabled={actionLoading === report.id}
                      >
                        Save notes
                      </button>
                    )}
                  </div>
                </div>
              )}
            </div>
          ))}
        </div>
      )}
    </div>
  );
}
