/* Hallmark · pre-emit critique: P5 H5 E5 S5 R5 V5 */
/* Hallmark · component: shift-matrix-table · genre: editorial · theme: Atelier (Dark & Light) · studied-DNA: https://inihaus.de */
import React from 'react';
import { Clock, UserCheck, Shield, Printer, Download, Award, CheckCircle2, UserX, UserPlus, MapPin, Edit3, Trash2 } from 'lucide-react';

export default function ShiftMatrixTable({
  event,
  user,
  onSignupClick,
  onCancelClick,
  onRemoveUserFromShift,
  onGenerateClaimLink,
  onExportPdf,
  onPrintView,
  onEditEvent,
  onDeleteEvent
}) {
  if (!event || !event.task_areas || event.task_areas.length === 0) {
    return (
      <div className="hallmark-panel rounded-sm p-12 text-center border border-grid font-mono">
        <Clock className="w-8 h-8 text-muted mx-auto mb-3" />
        <h3 className="font-serif text-xl font-bold text-main uppercase">Keine Aufgabenfelder vorhanden</h3>
        <p className="text-xs text-muted mt-1 mb-4">[ Event hat noch keine definierten Aufgabenfelder oder Schichten ]</p>
        {user && (user.is_admin_user || user.is_staff || user.is_superuser || event?.created_by === user.id || event?.created_by?.id === user.id || (event?.co_managers && event.co_managers.some(cm => (typeof cm === 'object' ? cm.id === user.id : cm === user.id)))) && onEditEvent && (
          <button
            onClick={() => onEditEvent(event)}
            className="px-4 py-2 rounded-sm bg-indigo-500/10 hover:bg-indigo-500/20 text-indigo-400 border border-indigo-500/30 font-bold text-xs inline-flex items-center gap-2"
          >
            <Edit3 className="w-4 h-4" /> SCHICHTEN & BEREICHE ANLEGEN
          </button>
        )}
      </div>
    );
  }

  const isGuest = !user;
  const isCoManager = user && event?.co_managers && event.co_managers.some(cm => (typeof cm === 'object' ? cm.id === user.id : cm === user.id));
  const isManager = user && (user.is_admin_user || user.is_staff || user.is_superuser || event?.created_by === user.id || event?.created_by?.id === user.id || isCoManager);

  return (
    <div className="space-y-6">
      {/* Event Header Panel */}
      <div className="hallmark-panel rounded-sm p-6 sm:p-8 border border-grid flex flex-col md:flex-row md:items-center justify-between gap-4">
        <div className="space-y-1 font-mono">
          <div className="flex flex-wrap items-center gap-2 text-xs text-muted mb-1">
            <span className="bg-subtle px-2.5 py-0.5 rounded-sm border border-grid font-bold text-main">
              {new Date(event.start_date).toLocaleDateString('de-DE')} — {new Date(event.end_date).toLocaleDateString('de-DE')}
            </span>
            {event.location && (
              <span className="flex items-center gap-1 text-muted">
                <MapPin className="w-3.5 h-3.5 shrink-0" />
                {event.location}
              </span>
            )}
            {event.is_active === false && (
              <span className="px-2 py-0.5 rounded-sm bg-amber-500/10 text-amber-500 border border-amber-500/20 font-bold">
                [ DEAKTIVIERT ]
              </span>
            )}
          </div>
          <h2 className="font-serif text-3xl sm:text-4xl font-bold uppercase tracking-tight text-main">{event.title}</h2>
          {event.description && <p className="text-xs font-sans text-muted max-w-2xl mt-1">{event.description}</p>}
        </div>

        <div className="flex items-center gap-2 no-print font-mono text-xs shrink-0">
          {isManager && onEditEvent && (
            <button
              onClick={() => onEditEvent(event)}
              className="px-3.5 py-1.5 rounded-sm bg-indigo-500/10 hover:bg-indigo-500/20 text-indigo-400 border border-indigo-500/30 transition flex items-center gap-1.5 font-bold"
              title="Schichten und Aufgabenbereiche für diese Veranstaltung bearbeiten"
            >
              <Edit3 className="w-3.5 h-3.5" /> SCHICHTEN BEARBEITEN
            </button>
          )}
          {user && (user.is_admin_user || user.is_staff || user.is_superuser || event?.created_by === user.id || event?.created_by?.id === user.id) && onDeleteEvent && (
            <button
              onClick={() => onDeleteEvent(event)}
              className="px-3.5 py-1.5 rounded-sm bg-red-500/10 hover:bg-red-500/20 text-red-400 border border-red-500/30 transition flex items-center gap-1.5 font-bold"
              title="Diese Veranstaltung unwiderruflich löschen"
            >
              <Trash2 className="w-3.5 h-3.5" /> LÖSCHEN
            </button>
          )}
          <button
            onClick={onPrintView}
            className="px-3.5 py-1.5 rounded-sm bg-surface hover:bg-surface-hover text-main border border-grid transition flex items-center gap-1.5 font-bold"
          >
            <Printer className="w-3.5 h-3.5" /> DRUCKEN
          </button>
          <button
            onClick={onExportPdf}
            className="px-3.5 py-1.5 rounded-sm bg-surface hover:bg-surface-hover text-main border border-grid transition flex items-center gap-1.5 font-bold"
          >
            <Download className="w-3.5 h-3.5" /> PDF
          </button>
        </div>
      </div>

      {/* Guest Privacy Banner */}
      {isGuest && (
        <div className="p-3.5 rounded-sm bg-amber-500/10 border border-amber-500/20 text-amber-500 text-xs font-mono flex items-center gap-2">
          <Shield className="w-4 h-4 shrink-0 text-amber-500" />
          <span>
            [ GAST-DATENSCHUTZ ]: Belegungszahlen sichtbar, Namensanzeige aus Datenschutzgründen <strong>anonymisiert</strong>.
          </span>
        </div>
      )}

      {/* Hallmark Matrix Schedule Table */}
      <div className="hallmark-panel rounded-sm border border-grid overflow-hidden">
        <div className="overflow-x-auto">
          <table className="w-full text-left border-collapse">
            <thead>
              <tr className="bg-subtle border-b border-grid text-[11px] font-mono text-muted uppercase tracking-wider">
                <th className="py-3.5 px-4 w-1/4">Aufgabenfeld</th>
                <th className="py-3.5 px-4 w-1/4">Schicht & Zeitraum</th>
                <th className="py-3.5 px-4 w-1/6">Qualifikation</th>
                <th className="py-3.5 px-4 w-1/4">Belegung & Personen</th>
                <th className="py-3.5 px-4 w-1/6 text-right">Aktion</th>
              </tr>
            </thead>
            <tbody className="divide-y divide-grid text-xs font-sans">
              {event.task_areas.map((area) => {
                if (!area.shifts || area.shifts.length === 0) {
                  return (
                    <tr key={`area-${area.id}`}>
                      <td className="py-3.5 px-4 font-serif text-lg font-bold text-main uppercase">{area.name}</td>
                      <td colSpan={4} className="py-3.5 px-4 text-muted font-mono text-[11px]">
                        [ Keine Schichten angelegt ]
                      </td>
                    </tr>
                  );
                }

                return area.shifts.map((shift, idx) => {
                  const isFirst = idx === 0;
                  const isFull = shift.is_full;

                  const userSignup = user ? shift.signups.find(s => !s.is_guest && s.display_name === user.display_name) : null;
                  const isUserSignedUp = Boolean(userSignup);

                  const hasSkillReqs = shift.required_skills && shift.required_skills.length > 0;

                  return (
                    <tr key={`shift-${shift.id}`} className="hover:bg-surface-hover/60 transition">
                      {isFirst ? (
                        <td
                          rowSpan={area.shifts.length}
                          className="py-3.5 px-4 font-serif text-lg font-bold text-main uppercase bg-subtle/80 align-top border-r border-grid"
                        >
                          <div>{area.name}</div>
                          {area.description && <div className="text-[11px] font-sans font-normal text-muted mt-0.5">{area.description}</div>}
                        </td>
                      ) : null}

                      <td className="py-3.5 px-4">
                        <div className="font-semibold text-main flex items-center gap-2 flex-wrap">
                          <span>{shift.title}</span>
                          {shift.date && (
                            <span className="text-[10px] font-mono font-bold text-indigo-400 bg-indigo-500/10 px-2 py-0.5 rounded-sm border border-indigo-500/20">
                              📅 {new Date(shift.date + 'T00:00:00').toLocaleDateString('de-DE', { weekday: 'short', day: '2-digit', month: '2-digit' })}
                            </span>
                          )}
                        </div>
                        <div className="text-[11px] font-mono text-muted flex items-center gap-1 mt-0.5">
                          <Clock className="w-3 h-3 text-muted shrink-0" />
                          <span>{shift.start_time} — {shift.end_time} Uhr</span>
                        </div>
                      </td>

                      <td className="py-3.5 px-4 font-mono">
                        {hasSkillReqs ? (
                          <div className="flex flex-wrap gap-1">
                            {shift.required_skills.map((s) => (
                              <span
                                key={s.id}
                                style={{ backgroundColor: `${s.color}15`, borderColor: `${s.color}35`, color: s.color }}
                                className="px-2 py-0.5 rounded-sm text-[10px] font-semibold border flex items-center gap-1"
                              >
                                <Award className="w-3 h-3 shrink-0" /> {s.name}
                              </span>
                            ))}
                          </div>
                        ) : (
                          <span className="text-[11px] text-muted">—</span>
                        )}
                      </td>

                      <td className="py-3.5 px-4 font-mono">
                        <div className="flex items-center gap-2">
                          <span className={`px-2 py-0.5 rounded-sm text-[11px] font-bold border ${
                            isFull
                              ? 'bg-red-500/10 text-red-500 border-red-500/20'
                              : 'bg-emerald-500/10 text-emerald-500 border-emerald-500/20'
                          }`}>
                            [ {shift.signups_count} / {shift.max_participants} BELEGT ]
                          </span>
                        </div>

                        {/* Attendees List */}
                        <div className="mt-2 space-y-1 font-sans">
                          {shift.signups.map((su) => (
                            <div key={su.id} className="text-[11px] text-muted flex items-center justify-between gap-2 p-1.5 rounded-sm bg-subtle border border-grid">
                              <div className="flex items-center gap-1.5 truncate">
                                <UserCheck className="w-3 h-3 text-muted shrink-0" />
                                <span className="truncate">{su.display_name}</span>
                                {su.is_guest && <span className="text-[9px] font-mono text-amber-500 px-1 rounded-sm bg-amber-500/10 border border-amber-500/20 font-bold">GAST</span>}
                              </div>

                              <div className="flex items-center gap-1 shrink-0">
                                {user && su.is_guest && onGenerateClaimLink && (
                                  <button
                                    onClick={() => onGenerateClaimLink(su)}
                                    className="text-indigo-400 hover:text-indigo-300 transition p-1 rounded-sm bg-indigo-500/10 hover:bg-indigo-500/20 border border-indigo-500/20 flex items-center gap-1 text-[10px] font-mono font-bold"
                                    title="Konto-Einladungslink für diese Gast-Eintragung kopieren"
                                  >
                                    <UserPlus className="w-3 h-3" /> LINK
                                  </button>
                                )}

                                {isManager && onRemoveUserFromShift && (
                                  <button
                                    onClick={() => onRemoveUserFromShift(shift, su.id)}
                                    className="text-muted hover:text-red-500 transition p-1 rounded-sm hover:bg-red-500/10"
                                    title="Person aus dieser Schicht entfernen"
                                  >
                                    <UserX className="w-3.5 h-3.5" />
                                  </button>
                                )}
                              </div>
                            </div>
                          ))}
                        </div>
                      </td>

                      <td className="py-3.5 px-4 text-right font-mono">
                        {isUserSignedUp ? (
                          <button
                            onClick={() => onCancelClick(shift)}
                            className="px-3 py-1.5 rounded-sm text-xs font-semibold bg-red-500/10 hover:bg-red-500/20 text-red-500 border border-red-500/20 transition flex items-center gap-1 ml-auto"
                          >
                            <UserX className="w-3.5 h-3.5" /> AUSTRAGEN
                          </button>
                        ) : isFull ? (
                          <span className="text-xs text-muted font-bold">[ VOLL ]</span>
                        ) : (
                          <button
                            onClick={() => onSignupClick(shift)}
                            style={{ backgroundColor: 'var(--brand-primary)' }}
                            className="px-3.5 py-1.5 rounded-sm text-xs font-bold text-white transition hover:brightness-110 flex items-center gap-1 ml-auto shadow-sm"
                          >
                            <CheckCircle2 className="w-3.5 h-3.5" /> EINTRAGEN
                          </button>
                        )}
                      </td>
                    </tr>
                  );
                });
              })}
            </tbody>
          </table>
        </div>
      </div>
    </div>
  );
}
