import { useState, useEffect } from "react";
import { useMutation, useQuery } from "@tanstack/react-query";
import { queryClient } from "@/client/rpc-client";

export function AdminAvailability() {
  const today = new Date().toISOString().split("T")[0];
  
  // Tab-Navigation (Slots entfernt)
  const [activeSubTab, setActiveSubTab] = useState<"recurring" | "timeoff">("recurring");
  
  // States für Recurring Rules
  const [selectedDayOfWeek, setSelectedDayOfWeek] = useState<number>(1); // 1=Montag
  const [ruleStartTime, setRuleStartTime] = useState<string>("13:00");
  const [ruleEndTime, setRuleEndTime] = useState<string>("18:00");
  const [editingRuleId, setEditingRuleId] = useState<string>("");
  
  // States für Time-Off
  const [timeOffStartDate, setTimeOffStartDate] = useState<string>("");
  const [timeOffEndDate, setTimeOffEndDate] = useState<string>("");
  const [timeOffReason, setTimeOffReason] = useState<string>("");
  const [editingTimeOffId, setEditingTimeOffId] = useState<string>("");
  
  
  // Neue Queries für wiederkehrende Verfügbarkeiten (mit Authentifizierung)
  const { data: recurringRules, refetch: refetchRecurringRules } = useQuery(
    queryClient.recurringAvailability.live.adminListRules.experimental_liveOptions({
      input: { sessionId: localStorage.getItem("sessionId") || "" }
    })
  );
  const { data: timeOffPeriods } = useQuery(
    queryClient.recurringAvailability.live.adminListTimeOff.experimental_liveOptions({
      input: { sessionId: localStorage.getItem("sessionId") || "" }
    })
  );

  const [errorMsg, setErrorMsg] = useState<string>("");
  const [successMsg, setSuccessMsg] = useState<string>("");

  // Auto-clear messages after 5 seconds
  useEffect(() => {
    if (errorMsg) {
      const timer = setTimeout(() => setErrorMsg(""), 5000);
      return () => clearTimeout(timer);
    }
  }, [errorMsg]);

  useEffect(() => {
    if (successMsg) {
      const timer = setTimeout(() => setSuccessMsg(""), 5000);
      return () => clearTimeout(timer);
    }
  }, [successMsg]);

  // Neue Mutations für wiederkehrende Verfügbarkeiten
  const { mutate: createRule } = useMutation(
    queryClient.recurringAvailability.createRule.mutationOptions()
  );
  const { mutate: updateRule } = useMutation(
    queryClient.recurringAvailability.updateRule.mutationOptions()
  );
  const { mutate: deleteRule } = useMutation(
    queryClient.recurringAvailability.deleteRule.mutationOptions()
  );
  const { mutate: toggleRuleActive } = useMutation(
    queryClient.recurringAvailability.toggleRuleActive.mutationOptions()
  );
  const { mutate: createTimeOff } = useMutation(
    queryClient.recurringAvailability.createTimeOff.mutationOptions()
  );
  const { mutate: updateTimeOff } = useMutation(
    queryClient.recurringAvailability.updateTimeOff.mutationOptions()
  );
  const { mutate: deleteTimeOff } = useMutation(
    queryClient.recurringAvailability.deleteTimeOff.mutationOptions()
  );

  
  // Helper-Funktion für Wochentag-Namen
  const getDayName = (dayOfWeek: number): string => {
    const days = ["Sonntag", "Montag", "Dienstag", "Mittwoch", "Donnerstag", "Freitag", "Samstag"];
    return days[dayOfWeek];
  };
  

  return (
    <div className="max-w-4xl mx-auto space-y-6">
      {/* Tab-Navigation (Slots entfernt) */}
      <div className="bg-white rounded-lg shadow">
        <div className="border-b border-gray-200">
          <nav className="-mb-px flex space-x-8 px-6">
            <button
              onClick={() => setActiveSubTab("recurring")}
              className={`py-4 px-1 border-b-2 font-medium text-sm ${
                activeSubTab === "recurring"
                  ? "border-pink-500 text-pink-600"
                  : "border-transparent text-gray-500 hover:text-gray-700 hover:border-gray-300"
              }`}
            >
              🔄 Wiederkehrende Zeiten
            </button>
            <button
              onClick={() => setActiveSubTab("timeoff")}
              className={`py-4 px-1 border-b-2 font-medium text-sm ${
                activeSubTab === "timeoff"
                  ? "border-pink-500 text-pink-600"
                  : "border-transparent text-gray-500 hover:text-gray-700 hover:border-gray-300"
              }`}
            >
              🏖️ Urlaubszeiten
            </button>
          </nav>
        </div>
      </div>
      
      {/* Slot-Tab und Slot-UI entfernt */}
      
      {/* Tab "Wiederkehrende Zeiten" */}
      {activeSubTab === "recurring" && (
        <div className="space-y-6">
          {/* Neue Regel erstellen */}
          <div className="bg-white rounded-lg shadow p-4">
            <h3 className="text-lg font-semibold mb-4">Neue wiederkehrende Regel erstellen</h3>
            
            <div className="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-3 gap-4">
              <div>
                <label className="block text-sm font-medium text-gray-700 mb-1">
                  Wochentag
                </label>
                <select
                  value={selectedDayOfWeek}
                  onChange={(e) => setSelectedDayOfWeek(Number(e.target.value))}
                  className="w-full border border-gray-300 rounded-md px-3 py-2 focus:outline-none focus:ring-2 focus:ring-pink-500"
                >
                  <option value={1}>Montag</option>
                  <option value={2}>Dienstag</option>
                  <option value={3}>Mittwoch</option>
                  <option value={4}>Donnerstag</option>
                  <option value={5}>Freitag</option>
                  <option value={6}>Samstag</option>
                  <option value={0}>Sonntag</option>
                </select>
              </div>
              
              <div>
                <label className="block text-sm font-medium text-gray-700 mb-1">
                  Startzeit
                </label>
                <input
                  type="time"
                  value={ruleStartTime}
                  onChange={(e) => setRuleStartTime(e.target.value)}
                  className="w-full border border-gray-300 rounded-md px-3 py-2 focus:outline-none focus:ring-2 focus:ring-pink-500"
                />
              </div>
              
              <div>
                <label className="block text-sm font-medium text-gray-700 mb-1">
                  Endzeit
                </label>
                <input
                  type="time"
                  value={ruleEndTime}
                  onChange={(e) => setRuleEndTime(e.target.value)}
                  className="w-full border border-gray-300 rounded-md px-3 py-2 focus:outline-none focus:ring-2 focus:ring-pink-500"
                />
              </div>
            </div>
            
            <div className="mt-4">
              <button
                onClick={() => {
                  setErrorMsg("");
                  setSuccessMsg("");
                  
                  if (ruleStartTime >= ruleEndTime) {
                    setErrorMsg("Startzeit muss vor der Endzeit liegen.");
                    return;
                  }
                  
                  const sessionId = localStorage.getItem("sessionId") || "";
                  if (!sessionId) {
                    setErrorMsg("Nicht eingeloggt. Bitte als Inhaber anmelden.");
                    return;
                  }
                  
                  createRule(
                    { sessionId, dayOfWeek: selectedDayOfWeek, startTime: ruleStartTime, endTime: ruleEndTime },
                    {
                      onSuccess: () => {
                        setSuccessMsg(`Regel für ${getDayName(selectedDayOfWeek)} erstellt.`);
                        // Sofort aktualisieren (zusätzlich zur Live-Subscription), damit Nutzer den Eintrag direkt sieht
                        refetchRecurringRules();
                      },
                      onError: (err: any) => {
                        setErrorMsg(err?.message || "Fehler beim Erstellen der Regel.");
                      }
                    }
                  );
                }}
                className="bg-pink-600 text-white px-4 py-2 rounded-md hover:bg-pink-700 font-medium transition-colors"
              >
                Regel hinzufügen
              </button>
            </div>
          </div>
          
          {/* Bestehende Regeln */}
          <div className="bg-white rounded-lg shadow">
            <div className="p-4 border-b">
              <h3 className="text-lg font-semibold">Bestehende Regeln</h3>
            </div>
            <div className="divide-y">
              {recurringRules?.length === 0 && (
                <div className="p-8 text-center text-gray-500">
                  <div className="text-lg font-medium mb-2">Noch keine wiederkehrenden Regeln definiert</div>
                  <div className="text-sm">Erstellen Sie Ihre erste Regel, um automatisch Slots zu generieren.</div>
                </div>
              )}
              {recurringRules?.map((rule) => (
                <div key={rule.id} className="p-4 hover:bg-gray-50 transition-colors">
                  <div className="flex items-center justify-between">
                    <div className="flex items-center gap-4">
                      <div className="font-medium">{getDayName(rule.dayOfWeek)}</div>
                      <div className="text-gray-600">{rule.startTime} - {rule.endTime} Uhr</div>
                      <span className={`px-2 py-1 rounded-full text-xs font-medium ${
                        rule.isActive 
                          ? "bg-green-100 text-green-800" 
                          : "bg-gray-100 text-gray-800"
                      }`}>
                        {rule.isActive ? "Aktiv" : "Inaktiv"}
                      </span>
                    </div>
                    <div className="flex items-center gap-2">
                      <button
                        onClick={() => {
                          const sessionId = localStorage.getItem("sessionId");
                          if (!sessionId) {
                            setErrorMsg("Nicht eingeloggt. Bitte als Inhaber anmelden.");
                            return;
                          }
                          toggleRuleActive(
                            { sessionId, id: rule.id },
                            {
                              onSuccess: () => {
                                setSuccessMsg(`Regel ${rule.isActive ? "deaktiviert" : "aktiviert"}.`);
                              },
                              onError: (err: any) => {
                                setErrorMsg(err?.message || "Fehler beim Umschalten der Regel.");
                              }
                            }
                          );
                        }}
                        className="px-3 py-1 text-blue-600 hover:bg-blue-50 rounded-md transition-colors text-sm"
                      >
                        {rule.isActive ? "Deaktivieren" : "Aktivieren"}
                      </button>
                      <button
                        onClick={() => {
                          const sessionId = localStorage.getItem("sessionId");
                          if (!sessionId) {
                            setErrorMsg("Nicht eingeloggt. Bitte als Inhaber anmelden.");
                            return;
                          }
                          deleteRule(
                            { sessionId, id: rule.id },
                            {
                              onSuccess: () => {
                                setSuccessMsg("Regel gelöscht.");
                              },
                              onError: (err: any) => {
                                setErrorMsg(err?.message || "Fehler beim Löschen der Regel.");
                              }
                            }
                          );
                        }}
                        className="px-3 py-1 text-red-600 hover:bg-red-50 rounded-md transition-colors text-sm"
                      >
                        Löschen
                      </button>
                    </div>
                  </div>
                </div>
              ))}
            </div>
          </div>
        </div>
      )}
      
      {/* Tab "Urlaubszeiten" */}
      {activeSubTab === "timeoff" && (
        <div className="space-y-6">
          {/* Neue Urlaubszeit erstellen */}
          <div className="bg-white rounded-lg shadow p-4">
            <h3 className="text-lg font-semibold mb-4">Neue Urlaubszeit erstellen</h3>
            
            <div className="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-4 gap-4">
              <div>
                <label className="block text-sm font-medium text-gray-700 mb-1">
                  Von Datum
                </label>
                <input
                  type="date"
                  value={timeOffStartDate}
                  onChange={(e) => setTimeOffStartDate(e.target.value)}
                  className="w-full border border-gray-300 rounded-md px-3 py-2 focus:outline-none focus:ring-2 focus:ring-pink-500"
                />
              </div>
              
              <div>
                <label className="block text-sm font-medium text-gray-700 mb-1">
                  Bis Datum
                </label>
                <input
                  type="date"
                  value={timeOffEndDate}
                  onChange={(e) => setTimeOffEndDate(e.target.value)}
                  className="w-full border border-gray-300 rounded-md px-3 py-2 focus:outline-none focus:ring-2 focus:ring-pink-500"
                />
              </div>
              
              <div className="md:col-span-2">
                <label className="block text-sm font-medium text-gray-700 mb-1">
                  Grund/Notiz
                </label>
                <input
                  type="text"
                  placeholder="z.B. Sommerurlaub, Feiertag"
                  value={timeOffReason}
                  onChange={(e) => setTimeOffReason(e.target.value)}
                  className="w-full border border-gray-300 rounded-md px-3 py-2 focus:outline-none focus:ring-2 focus:ring-pink-500"
                />
              </div>
            </div>
            
            <div className="mt-4">
              <button
                onClick={() => {
                  setErrorMsg("");
                  setSuccessMsg("");
                  
                  if (!timeOffStartDate || !timeOffEndDate || !timeOffReason) {
                    setErrorMsg("Bitte alle Felder ausfüllen.");
                    return;
                  }
                  
                  if (timeOffStartDate > timeOffEndDate) {
                    setErrorMsg("Startdatum muss vor dem Enddatum liegen.");
                    return;
                  }
                  
                  const sessionId = localStorage.getItem("sessionId") || "";
                  if (!sessionId) {
                    setErrorMsg("Nicht eingeloggt. Bitte als Inhaber anmelden.");
                    return;
                  }
                  
                  createTimeOff(
                    { sessionId, startDate: timeOffStartDate, endDate: timeOffEndDate, reason: timeOffReason },
                    {
                      onSuccess: () => {
                        setSuccessMsg("Urlaubszeit hinzugefügt.");
                        setTimeOffStartDate("");
                        setTimeOffEndDate("");
                        setTimeOffReason("");
                      },
                      onError: (err: any) => {
                        setErrorMsg(err?.message || "Fehler beim Hinzufügen der Urlaubszeit.");
                      }
                    }
                  );
                }}
                className="bg-pink-600 text-white px-4 py-2 rounded-md hover:bg-pink-700 font-medium transition-colors"
              >
                Urlaubszeit hinzufügen
              </button>
            </div>
          </div>
          
          {/* Bestehende Urlaubszeiten */}
          <div className="bg-white rounded-lg shadow">
            <div className="p-4 border-b">
              <h3 className="text-lg font-semibold">Bestehende Urlaubszeiten</h3>
            </div>
            <div className="divide-y">
              {timeOffPeriods?.length === 0 && (
                <div className="p-8 text-center text-gray-500">
                  <div className="text-lg font-medium mb-2">Keine Urlaubszeiten eingetragen</div>
                  <div className="text-sm">Fügen Sie Urlaubszeiten hinzu, um automatisch Slots zu blockieren.</div>
                </div>
              )}
              {timeOffPeriods?.map((period) => {
                const today = new Date().toISOString().split("T")[0];
                const isPast = period.endDate < today;
                const isCurrent = period.startDate <= today && period.endDate >= today;
                const isFuture = period.startDate > today;
                
                return (
                  <div key={period.id} className="p-4 hover:bg-gray-50 transition-colors">
                    <div className="flex items-center justify-between">
                      <div className="flex items-center gap-4">
                        <div className="font-medium">
                          {new Date(period.startDate).toLocaleDateString('de-DE')} - {new Date(period.endDate).toLocaleDateString('de-DE')}
                        </div>
                        <div className="text-gray-600">{period.reason}</div>
                        <span className={`px-2 py-1 rounded-full text-xs font-medium ${
                          isPast 
                            ? "bg-gray-100 text-gray-800"
                            : isCurrent 
                            ? "bg-red-100 text-red-800"
                            : "bg-blue-100 text-blue-800"
                        }`}>
                          {isPast ? "Vergangen" : isCurrent ? "Aktuell" : "Geplant"}
                        </span>
                      </div>
                      <div className="flex items-center gap-2">
                        <button
                          onClick={() => {
                            const sessionId = localStorage.getItem("sessionId");
                            if (!sessionId) {
                              setErrorMsg("Nicht eingeloggt. Bitte als Inhaber anmelden.");
                              return;
                            }
                            deleteTimeOff(
                              { sessionId, id: period.id },
                              {
                                onSuccess: () => {
                                  setSuccessMsg("Urlaubszeit gelöscht.");
                                },
                                onError: (err: any) => {
                                  setErrorMsg(err?.message || "Fehler beim Löschen der Urlaubszeit.");
                                }
                              }
                            );
                          }}
                          className="px-3 py-1 text-red-600 hover:bg-red-50 rounded-md transition-colors text-sm"
                        >
                          Löschen
                        </button>
                      </div>
                    </div>
                  </div>
                );
              })}
            </div>
          </div>
        </div>
      )}
    </div>
  );
}