"use client";

import { useState, useEffect } from "react";
import { useRouter } from "next/navigation";
import {
  Calendar,
  Clock,
  Video,
  Search,
  CalendarCheck,
  X,
  Loader2,
  User,
  Settings,
  Check,
} from "lucide-react";
import { useAppTheme } from "@/components/ThemeProvider";
import { listAppointments, scheduleAppointment, rejectAppointment } from "@/lib/actions/appointments";
import { useAppointments } from "@/hooks/useAppointments";
import { Input } from "@/components/ui/input";
import { Button } from "@/components/ui/button";
import {
  Dialog,
  DialogContent,
  DialogDescription,
  DialogFooter,
  DialogHeader,
  DialogTitle,
} from "@/components/ui/dialog";
import { ScheduleAppointmentDialog } from "@/components/ScheduleAppointmentDialog";
import { toast } from "sonner";
import type { Appointment } from "@/lib/models/appointments";

export default function Booking() {
  const router = useRouter();
  const [appointments, setAppointments] = useState<Appointment[]>([]);
  const [loading, setLoading] = useState(true);
  const [searchTerm, setSearchTerm] = useState("");
  const [scheduleDialogOpen, setScheduleDialogOpen] = useState(false);
  const [rejectDialogOpen, setRejectDialogOpen] = useState(false);
  const [selectedAppointment, setSelectedAppointment] = useState<Appointment | null>(null);
  const [scheduledDate, setScheduledDate] = useState<Date | undefined>(undefined);
  const [scheduledTime, setScheduledTime] = useState<string>("09:00");
  const [scheduledDuration, setScheduledDuration] = useState<number>(60);
  const [rejectionReason, setRejectionReason] = useState<string>("");
  const [isScheduling, setIsScheduling] = useState(false);
  const [isRejecting, setIsRejecting] = useState(false);
  const { theme } = useAppTheme();
  const isDark = theme === "dark";
  
  // Availability management
  const { 
    adminAvailability, 
    isLoadingAdminAvailability, 
    updateAvailability, 
    isUpdatingAvailability, 
    refetchAdminAvailability,
  } = useAppointments();
  const [selectedDays, setSelectedDays] = useState<number[]>([]);
  const [availabilityDialogOpen, setAvailabilityDialogOpen] = useState(false);
  const [dayTimeSlots, setDayTimeSlots] = useState<Record<number, string[]>>({});

  const daysOfWeek = [
    { value: 0, label: "Monday" },
    { value: 1, label: "Tuesday" },
    { value: 2, label: "Wednesday" },
    { value: 3, label: "Thursday" },
    { value: 4, label: "Friday" },
    { value: 5, label: "Saturday" },
    { value: 6, label: "Sunday" },
  ];

  // Time slots will be loaded from API in the useEffect below

  // Initialize selected days and time slots when availability is loaded
  useEffect(() => {
    // Try new format first (availability_schedule)
    if (adminAvailability?.availability_schedule) {
      const schedule = adminAvailability.availability_schedule;
      const days = Object.keys(schedule).map(Number);
      setSelectedDays(days);
      
      // Convert schedule format to dayTimeSlots format
      const initialSlots: Record<number, string[]> = {};
      days.forEach((day) => {
        initialSlots[day] = schedule[day.toString()] || [];
      });
      
      setDayTimeSlots(initialSlots);
    } 
    // Fallback to legacy format
    else if (adminAvailability?.available_days) {
      setSelectedDays(adminAvailability.available_days);
      // Load saved time slots or use defaults
      const savedTimeSlots = localStorage.getItem("adminAvailabilityTimeSlots");
      let initialSlots: Record<number, string[]> = {};
      
      if (savedTimeSlots) {
        try {
          const parsed = JSON.parse(savedTimeSlots);
          // Only use saved slots for days that are currently available
          adminAvailability.available_days.forEach((day) => {
            // Map old time slot names to new ones
            const oldSlots = parsed[day] || [];
            initialSlots[day] = oldSlots.map((slot: string) => {
              if (slot === "lunchtime") return "afternoon";
              if (slot === "afternoon") return "evening";
              return slot;
            }).filter((slot: string) => ["morning", "afternoon", "evening"].includes(slot));
            // If no valid slots after mapping, use defaults
            if (initialSlots[day].length === 0) {
              initialSlots[day] = ["morning", "afternoon"];
            }
          });
        } catch (error) {
          // If parsing fails, use defaults
          adminAvailability.available_days.forEach((day) => {
            initialSlots[day] = ["morning", "afternoon"];
          });
        }
      } else {
        // No saved slots, use defaults
        adminAvailability.available_days.forEach((day) => {
          initialSlots[day] = ["morning", "afternoon"];
        });
      }
      
      setDayTimeSlots(initialSlots);
    }
  }, [adminAvailability]);

  const timeSlotOptions = [
    { value: "morning", label: "Morning" },
    { value: "afternoon", label: "Lunchtime" },
    { value: "evening", label: "Evening" },
  ];

  const handleDayToggle = (day: number) => {
    setSelectedDays((prev) => {
      const newDays = prev.includes(day) 
        ? prev.filter((d) => d !== day)
        : [...prev, day].sort();
      
      // Initialize time slots for newly added day
      if (!prev.includes(day) && !dayTimeSlots[day]) {
        setDayTimeSlots((prevSlots) => ({
          ...prevSlots,
          [day]: ["morning", "afternoon"],
        }));
      }
      
      // Remove time slots for removed day
      if (prev.includes(day)) {
        setDayTimeSlots((prevSlots) => {
          const newSlots = { ...prevSlots };
          delete newSlots[day];
          return newSlots;
        });
      }
      
      return newDays;
    });
  };

  const handleTimeSlotToggle = (day: number, slot: string) => {
    setDayTimeSlots((prev) => {
      const currentSlots = prev[day] || [];
      const newSlots = currentSlots.includes(slot)
        ? currentSlots.filter((s) => s !== slot)
        : [...currentSlots, slot];
      
      return {
        ...prev,
        [day]: newSlots,
      };
    });
  };

  const handleSaveAvailability = async () => {
    if (selectedDays.length === 0) {
      toast.error("Please select at least one available day");
      return;
    }

    // Validate all time slots
    for (const day of selectedDays) {
      const timeSlots = dayTimeSlots[day];
      if (!timeSlots || timeSlots.length === 0) {
        toast.error(`Please select at least one time slot for ${daysOfWeek.find(d => d.value === day)?.label}`);
        return;
      }
      // Validate time slots are valid
      const validSlots = ["morning", "afternoon", "evening"];
      const invalidSlots = timeSlots.filter(slot => !validSlots.includes(slot));
      if (invalidSlots.length > 0) {
        toast.error(`Invalid time slots: ${invalidSlots.join(", ")}. Only morning, afternoon, and evening are allowed.`);
        return;
      }
    }

    try {
      // Build availability_schedule format: {"0": ["morning", "evening"], "1": ["afternoon"]}
      const availabilitySchedule: Record<string, ("morning" | "afternoon" | "evening")[]> = {};
      selectedDays.forEach(day => {
        const timeSlots = dayTimeSlots[day];
        if (timeSlots && timeSlots.length > 0) {
          // Ensure only valid time slots and remove duplicates
          const validSlots = timeSlots
            .filter((slot): slot is "morning" | "afternoon" | "evening" => 
              ["morning", "afternoon", "evening"].includes(slot)
            )
            .filter((slot, index, self) => self.indexOf(slot) === index); // Remove duplicates
          
          if (validSlots.length > 0) {
            availabilitySchedule[day.toString()] = validSlots;
          }
        }
      });

      // Validate we have at least one day with slots
      if (Object.keys(availabilitySchedule).length === 0) {
        toast.error("Please select at least one day with valid time slots");
        return;
      }

      // Send in new format
      await updateAvailability({ availability_schedule: availabilitySchedule });
      
      // Also save to localStorage for backwards compatibility
      localStorage.setItem("adminAvailabilityTimeSlots", JSON.stringify(dayTimeSlots));
      
      toast.success("Availability updated successfully!");
      // Refresh availability data
      if (refetchAdminAvailability) {
        await refetchAdminAvailability();
      }
      setAvailabilityDialogOpen(false);
    } catch (error) {
      const errorMessage = error instanceof Error ? error.message : "Failed to update availability";
      toast.error(`Failed to update availability: ${errorMessage}`, {
        duration: 5000,
      });
    }
  };

  const handleOpenAvailabilityDialog = () => {
    // Try new format first (availability_schedule)
    if (adminAvailability?.availability_schedule) {
      const schedule = adminAvailability.availability_schedule;
      const days = Object.keys(schedule).map(Number);
      setSelectedDays(days);
      
      // Convert schedule format to dayTimeSlots format
      const initialSlots: Record<number, string[]> = {};
      days.forEach((day) => {
        initialSlots[day] = schedule[day.toString()] || ["morning", "afternoon"];
      });
      setDayTimeSlots(initialSlots);
    } 
    // Fallback to legacy format
    else if (adminAvailability?.available_days) {
      setSelectedDays(adminAvailability.available_days);
      // Initialize time slots for each day
      const initialSlots: Record<number, string[]> = {};
      adminAvailability.available_days.forEach((day) => {
        initialSlots[day] = dayTimeSlots[day] || ["morning", "afternoon"];
      });
      setDayTimeSlots(initialSlots);
    } else {
      // No existing availability, start fresh
      setSelectedDays([]);
      setDayTimeSlots({});
    }
    setAvailabilityDialogOpen(true);
  };

  useEffect(() => {
    const fetchBookings = async () => {
      setLoading(true);
      try {
        const data = await listAppointments();
        setAppointments(data || []);
      } catch (error) {
        toast.error("Failed to load appointments. Please try again.");
        setAppointments([]);
      } finally {
        setLoading(false);
      }
    };

    fetchBookings();
  }, []);

  const formatDate = (dateString: string) => {
    const date = new Date(dateString);
    return date.toLocaleDateString("en-US", {
      month: "short",
      day: "numeric",
      year: "numeric",
    });
  };

  const formatTime = (dateString: string) => {
    const date = new Date(dateString);
    return date.toLocaleTimeString("en-US", {
      hour: "numeric",
      minute: "2-digit",
      hour12: true,
    });
  };

  const getStatusColor = (status: string) => {
    const normalized = status.toLowerCase();
    if (isDark) {
      switch (normalized) {
        case "scheduled":
          return "bg-blue-500/20 text-blue-200";
        case "completed":
          return "bg-green-500/20 text-green-200";
        case "rejected":
        case "cancelled":
          return "bg-red-500/20 text-red-200";
        case "pending_review":
        case "pending":
          return "bg-yellow-500/20 text-yellow-200";
        default:
          return "bg-gray-700 text-gray-200";
      }
    }
    switch (normalized) {
      case "scheduled":
        return "bg-blue-100 text-blue-700";
      case "completed":
        return "bg-green-100 text-green-700";
      case "rejected":
      case "cancelled":
        return "bg-red-100 text-red-700";
      case "pending_review":
      case "pending":
        return "bg-yellow-100 text-yellow-700";
      default:
        return "bg-gray-100 text-gray-700";
    }
  };

  const formatStatus = (status: string) => {
    return status.replace("_", " ").replace(/\b\w/g, (l) => l.toUpperCase());
  };

  const handleViewDetails = (appointment: Appointment) => {
    router.push(`/admin/booking/${appointment.id}`);
  };

  const handleScheduleClick = (appointment: Appointment) => {
    setSelectedAppointment(appointment);
    setScheduledDate(undefined);
    setScheduledTime("09:00");
    setScheduledDuration(60);
    setScheduleDialogOpen(true);
  };

  const handleRejectClick = (appointment: Appointment) => {
    setSelectedAppointment(appointment);
    setRejectionReason("");
    setRejectDialogOpen(true);
  };

  const handleSchedule = async () => {
    if (!selectedAppointment) {
      toast.error("No appointment selected");
      return;
    }

    if (!scheduledDate) {
      toast.error("Please select a date");
      return;
    }

    if (!scheduledTime) {
      toast.error("Please select a time");
      return;
    }

    setIsScheduling(true);
    try {
      // Combine date and time into ISO datetime string
      const [hours, minutes] = scheduledTime.split(":");
      const datetime = new Date(scheduledDate);
      datetime.setHours(parseInt(hours, 10), parseInt(minutes, 10), 0, 0);
      const isoString = datetime.toISOString();

      await scheduleAppointment(selectedAppointment.id, {
        scheduled_datetime: isoString,
        scheduled_duration: scheduledDuration,
      });

      toast.success("Appointment scheduled successfully!");
      setScheduleDialogOpen(false);
      setScheduledDate(undefined);
      setScheduledTime("09:00");
      setScheduledDuration(60);
      
      // Refresh appointments list
      const data = await listAppointments();
      setAppointments(data || []);
    } catch (error) {
      const errorMessage = error instanceof Error ? error.message : "Failed to schedule appointment";
      toast.error(errorMessage);
    } finally {
      setIsScheduling(false);
    }
  };

  const handleReject = async () => {
    if (!selectedAppointment) {
      return;
    }

    setIsRejecting(true);
    try {
      await rejectAppointment(selectedAppointment.id, {
        rejection_reason: rejectionReason || undefined,
      });

      toast.success("Appointment rejected successfully");
      setRejectDialogOpen(false);
      
      // Refresh appointments list
      const data = await listAppointments();
      setAppointments(data || []);
    } catch (error) {
      const errorMessage = error instanceof Error ? error.message : "Failed to reject appointment";
      toast.error(errorMessage);
    } finally {
      setIsRejecting(false);
    }
  };


  const filteredAppointments = appointments.filter(
    (appointment) =>
      appointment.first_name
        .toLowerCase()
        .includes(searchTerm.toLowerCase()) ||
      appointment.last_name
        .toLowerCase()
        .includes(searchTerm.toLowerCase()) ||
      appointment.email.toLowerCase().includes(searchTerm.toLowerCase()) ||
      (appointment.phone && appointment.phone.toLowerCase().includes(searchTerm.toLowerCase()))
  );

  return (
    <div className={`min-h-screen ${isDark ? "bg-gray-900" : "bg-gray-50"}`}>

      {/* Main Content */}
      <main className="p-3 sm:p-4 md:p-6 lg:p-8">
          {/* Page Header */}
          <div className="mb-4 sm:mb-6 flex flex-col gap-3 sm:gap-4">
            <div className="flex flex-col sm:flex-row sm:items-center sm:justify-between gap-3 sm:gap-4">
              <div>
                <h1 className={`text-xl sm:text-2xl font-semibold mb-1 ${isDark ? "text-white" : "text-gray-900"}`}>
                  Bookings
                </h1>
                <p className={`text-xs sm:text-sm ${isDark ? "text-gray-400" : "text-gray-500"}`}>
                  Manage and view all appointment bookings
                </p>
              </div>
              <Button
                onClick={handleOpenAvailabilityDialog}
                variant="outline"
                className={`flex items-center gap-2 ${isDark ? "border-gray-700 hover:bg-gray-800" : "border-gray-300 hover:bg-gray-50"}`}
              >
                <Settings className="w-4 h-4" />
                Manage Availability
              </Button>
            </div>

            {/* Search Bar */}
            <div className="relative">
              <Search className={`absolute left-3 top-1/2 transform -translate-y-1/2 w-4 h-4 ${isDark ? "text-gray-400" : "text-gray-500"}`} />
              <Input
                type="text"
                placeholder="Search by name, email, or phone..."
                value={searchTerm}
                onChange={(e) => setSearchTerm(e.target.value)}
                className={`pl-10 ${isDark ? "bg-gray-800 border-gray-700 text-white placeholder:text-gray-400" : "bg-white border-gray-200 text-gray-900 placeholder:text-gray-500"}`}
              />
            </div>
          </div>

          {/* Available Days Display Card */}
          {adminAvailability && (
            <div className={`mb-4 sm:mb-6 rounded-lg border p-4 sm:p-5 ${isDark ? "bg-gray-800 border-gray-700" : "bg-white border-gray-200"}`}>
              <div className="flex items-start gap-3">
                <div className={`p-2 rounded-lg ${isDark ? "bg-rose-500/20" : "bg-rose-50"}`}>
                  <CalendarCheck className={`w-5 h-5 ${isDark ? "text-rose-400" : "text-rose-600"}`} />
                </div>
                <div className="flex-1 min-w-0">
                  <h3 className={`text-sm font-semibold mb-3 ${isDark ? "text-white" : "text-gray-900"}`}>
                    Weekly Availability
                  </h3>
                    {(adminAvailability.availability_schedule || (adminAvailability.available_days_display && adminAvailability.available_days_display.length > 0)) ? (
                      <div className="flex flex-wrap gap-2">
                        {(() => {
                          // Try new format first
                          if (adminAvailability.availability_schedule) {
                            return Object.keys(adminAvailability.availability_schedule).map((dayKey) => {
                              const dayNum = parseInt(dayKey);
                              const dayName = daysOfWeek.find(d => d.value === dayNum)?.label || `Day ${dayNum}`;
                              const timeSlots = adminAvailability.availability_schedule![dayKey] || [];
                              const slotLabels = timeSlots.map((slot: string) => {
                                const option = timeSlotOptions.find(opt => opt.value === slot);
                                return option ? option.label : slot;
                              });
                              return (
                                <div
                                  key={dayNum}
                                  className={`flex items-center gap-2 px-2.5 py-1.5 rounded-lg text-sm whitespace-nowrap ${
                                    isDark
                                      ? "bg-rose-500/10 text-rose-200 border border-rose-500/20"
                                      : "bg-rose-50 text-rose-700 border border-rose-200"
                                  }`}
                                >
                                  <Check className={`w-3.5 h-3.5 shrink-0 ${isDark ? "text-rose-400" : "text-rose-600"}`} />
                                  <span className="font-medium shrink-0">{dayName}</span>
                                  {slotLabels.length > 0 && (
                                    <span className={`text-sm shrink-0 ${isDark ? "text-rose-300" : "text-rose-600"}`}>
                                      ({slotLabels.join(", ")})
                                    </span>
                                  )}
                                </div>
                              );
                            });
                          }
                          // Fallback to legacy format
                          else if (adminAvailability.available_days && adminAvailability.available_days.length > 0) {
                            return adminAvailability.available_days.map((dayNum, index) => {
                              const dayName = daysOfWeek.find(d => d.value === dayNum)?.label || adminAvailability.available_days_display?.[index];
                          const timeSlots = dayTimeSlots[dayNum] || [];
                          const slotLabels = timeSlots.map(slot => {
                            const option = timeSlotOptions.find(opt => opt.value === slot);
                            return option ? option.label : slot;
                          });
                          return (
                            <div
                              key={dayNum}
                              className={`flex items-center gap-2 px-2.5 py-1.5 rounded-lg text-sm whitespace-nowrap ${
                                isDark
                                  ? "bg-rose-500/10 text-rose-200 border border-rose-500/20"
                                  : "bg-rose-50 text-rose-700 border border-rose-200"
                              }`}
                            >
                              <Check className={`w-3.5 h-3.5 shrink-0 ${isDark ? "text-rose-400" : "text-rose-600"}`} />
                              <span className="font-medium shrink-0">{dayName}</span>
                              {slotLabels.length > 0 && (
                                <span className={`text-sm shrink-0 ${isDark ? "text-rose-300" : "text-rose-600"}`}>
                                  ({slotLabels.join(", ")})
                                </span>
                              )}
                            </div>
                          );
                            });
                          }
                          return null;
                        })()}
                      </div>
                    ) : (
                      <p className={`text-sm ${isDark ? "text-gray-400" : "text-gray-500"}`}>
                        No availability set. Click "Manage Availability" to set your available days.
                      </p>
                    )}
                  </div>
                </div>
              </div>
          )}

          {loading ? (
            <div className="flex items-center justify-center py-12">
              <div className={`animate-spin rounded-full h-8 w-8 border-b-2 ${isDark ? "border-gray-600" : "border-gray-400"}`}></div>
            </div>
          ) : filteredAppointments.length === 0 ? (
            <div className={`rounded-lg border p-12 text-center ${isDark ? "bg-gray-800 border-gray-700" : "bg-white border-gray-200"}`}>
              <Calendar className={`w-12 h-12 mx-auto mb-4 ${isDark ? "text-gray-500" : "text-gray-400"}`} />
              <p className={`font-medium mb-1 ${isDark ? "text-gray-200" : "text-gray-600"}`}>No bookings found</p>
              <p className={`text-sm ${isDark ? "text-gray-400" : "text-gray-500"}`}>
                {searchTerm
                  ? "Try adjusting your search terms"
                  : "No appointments have been created yet"}
              </p>
            </div>
          ) : (
            <div className={`rounded-lg border overflow-hidden ${isDark ? "bg-gray-800 border-gray-700" : "bg-white border-gray-200"}`}>
              <div className="overflow-x-auto">
                <table className="w-full">
                  <thead className={`${isDark ? "bg-gray-800 border-b border-gray-700" : "bg-gray-50 border-b border-gray-200"}`}>
                    <tr>
                      <th className={`px-3 sm:px-4 md:px-6 py-3 text-left text-xs font-medium uppercase tracking-wider ${isDark ? "text-gray-400" : "text-gray-500"}`}>
                        Patient
                      </th>
                      <th className={`px-3 sm:px-4 md:px-6 py-3 text-left text-xs font-medium uppercase tracking-wider hidden md:table-cell ${isDark ? "text-gray-400" : "text-gray-500"}`}>
                        Date & Time
                      </th>
                      <th className={`px-3 sm:px-4 md:px-6 py-3 text-left text-xs font-medium uppercase tracking-wider hidden lg:table-cell ${isDark ? "text-gray-400" : "text-gray-500"}`}>
                        Duration
                      </th>
                      <th className={`px-3 sm:px-4 md:px-6 py-3 text-left text-xs font-medium uppercase tracking-wider ${isDark ? "text-gray-400" : "text-gray-500"}`}>
                        Status
                      </th>
                      <th className={`px-3 sm:px-4 md:px-6 py-3 text-left text-xs font-medium uppercase tracking-wider hidden lg:table-cell ${isDark ? "text-gray-400" : "text-gray-500"}`}>
                        Preferred Availability
                      </th>
                      <th className={`px-3 sm:px-4 md:px-6 py-3 text-left text-xs font-medium uppercase tracking-wider hidden xl:table-cell ${isDark ? "text-gray-400" : "text-gray-500"}`}>
                        Created
                      </th>
                      <th className={`px-3 sm:px-4 md:px-6 py-3 text-right text-xs font-medium uppercase tracking-wider ${isDark ? "text-gray-400" : "text-gray-500"}`}>
                        Actions
                      </th>
                    </tr>
                  </thead>
                  <tbody className={`${isDark ? "bg-gray-800 divide-gray-700" : "bg-white divide-gray-200"}`}>
                    {filteredAppointments.map((appointment) => (
                      <tr
                        key={appointment.id}
                        className={`transition-colors cursor-pointer ${isDark ? "hover:bg-gray-700" : "hover:bg-gray-50"}`}
                        onClick={() => handleViewDetails(appointment)}
                      >
                        <td className="px-3 sm:px-4 md:px-6 py-4">
                          <div className="flex items-center">
                            <div className={`shrink-0 h-8 w-8 sm:h-10 sm:w-10 rounded-full flex items-center justify-center ${isDark ? "bg-gray-700" : "bg-gray-100"}`}>
                              <User className={`w-4 h-4 sm:w-5 sm:h-5 ${isDark ? "text-gray-200" : "text-gray-600"}`} />
                            </div>
                            <div className="ml-2 sm:ml-4 min-w-0">
                              <div className={`text-xs sm:text-sm font-medium truncate ${isDark ? "text-white" : "text-gray-900"}`}>
                                {appointment.first_name} {appointment.last_name}
                              </div>
                              <div className={`text-xs sm:text-sm truncate hidden sm:block ${isDark ? "text-gray-400" : "text-gray-500"}`}>
                                {appointment.email}
                              </div>
                              {appointment.phone && (
                                <div className={`text-xs truncate hidden sm:block ${isDark ? "text-gray-500" : "text-gray-400"}`}>
                                  {appointment.phone}
                                </div>
                              )}
                              {appointment.scheduled_datetime && (
                                <div className={`text-xs sm:hidden mt-0.5 ${isDark ? "text-gray-400" : "text-gray-500"}`}>
                                  {formatDate(appointment.scheduled_datetime)}
                                </div>
                              )}
                            </div>
                          </div>
                        </td>
                        <td className="px-3 sm:px-4 md:px-6 py-4 whitespace-nowrap hidden md:table-cell">
                          {appointment.scheduled_datetime ? (
                            <>
                              <div className={`text-xs sm:text-sm ${isDark ? "text-white" : "text-gray-900"}`}>
                                {formatDate(appointment.scheduled_datetime)}
                              </div>
                              <div className={`text-xs sm:text-sm flex items-center gap-1 ${isDark ? "text-gray-400" : "text-gray-500"}`}>
                                <Clock className="w-3 h-3" />
                                {formatTime(appointment.scheduled_datetime)}
                              </div>
                            </>
                          ) : (
                            <div className={`text-xs sm:text-sm ${isDark ? "text-gray-400" : "text-gray-500"}`}>
                              Not scheduled
                            </div>
                          )}
                        </td>
                        <td className={`px-3 sm:px-4 md:px-6 py-4 whitespace-nowrap text-xs sm:text-sm hidden lg:table-cell ${isDark ? "text-white" : "text-gray-900"}`}>
                          {appointment.scheduled_duration ? `${appointment.scheduled_duration} min` : "-"}
                        </td>
                        <td className="px-3 sm:px-4 md:px-6 py-4 whitespace-nowrap">
                          <span
                            className={`px-2 py-1 inline-flex text-xs leading-5 font-semibold rounded-full ${getStatusColor(
                              appointment.status
                            )}`}
                          >
                            {formatStatus(appointment.status)}
                          </span>
                        </td>
                        <td className={`px-3 sm:px-4 md:px-6 py-4 text-xs sm:text-sm hidden lg:table-cell ${isDark ? "text-gray-400" : "text-gray-500"}`}>
                          {(() => {
                            const dayNames: Record<number, string> = {
                              0: "Monday",
                              1: "Tuesday",
                              2: "Wednesday",
                              3: "Thursday",
                              4: "Friday",
                              5: "Saturday",
                              6: "Sunday",
                            };
                            const timeSlotLabels: Record<string, string> = {
                              morning: "Morning",
                              afternoon: "Lunchtime",
                              evening: "Evening",
                            };
                            
                            // Show selected_slots if available
                            if (appointment.selected_slots && Array.isArray(appointment.selected_slots) && appointment.selected_slots.length > 0) {
                              return (
                                <div className="flex flex-col gap-1">
                                  {appointment.selected_slots.slice(0, 2).map((slot, idx) => (
                                    <span key={idx} className="text-xs sm:text-sm">
                                      {dayNames[slot.day] || `Day ${slot.day}`} - {timeSlotLabels[slot.time_slot] || slot.time_slot}
                                    </span>
                                  ))}
                                  {appointment.selected_slots.length > 2 && (
                                    <span className="text-xs opacity-75">
                                      +{appointment.selected_slots.length - 2} more
                                    </span>
                                  )}
                                </div>
                              );
                            }
                            
                            // Fallback to preferred_dates and preferred_time_slots if selected_slots not available
                            const dates = Array.isArray(appointment.preferred_dates) 
                              ? appointment.preferred_dates 
                              : appointment.preferred_dates 
                                ? [appointment.preferred_dates] 
                                : [];
                            
                            const timeSlots = Array.isArray(appointment.preferred_time_slots)
                              ? appointment.preferred_time_slots
                              : appointment.preferred_time_slots
                                ? [appointment.preferred_time_slots]
                                : [];
                            
                            if (dates.length === 0 && timeSlots.length === 0) {
                              return <span>-</span>;
                            }
                            
                            return (
                              <div className="flex flex-col gap-1.5">
                                {dates.length > 0 && (
                                  <div className="flex flex-col gap-0.5">
                                    {dates.slice(0, 2).map((date, idx) => (
                                      <span key={idx} className="font-medium">
                                        {formatDate(date)}
                                      </span>
                                    ))}
                                    {dates.length > 2 && (
                                      <span className="text-xs opacity-75">
                                        +{dates.length - 2} more date{dates.length - 2 > 1 ? 's' : ''}
                                      </span>
                                    )}
                                  </div>
                                )}
                                {timeSlots.length > 0 && (
                                  <div className="flex flex-wrap gap-1">
                                    {timeSlots.map((slot, idx) => {
                                      const normalizedSlot = String(slot).toLowerCase().trim();
                                      return (
                                        <span
                                          key={idx}
                                          className={`px-2 py-0.5 rounded text-xs font-medium ${
                                            isDark
                                              ? "bg-blue-500/20 text-blue-300 border border-blue-500/30"
                                              : "bg-blue-50 text-blue-700 border border-blue-200"
                                          }`}
                                        >
                                          {timeSlotLabels[normalizedSlot] || slot}
                                        </span>
                                      );
                                    })}
                                  </div>
                                )}
                              </div>
                            );
                          })()}
                        </td>
                        <td className={`px-3 sm:px-4 md:px-6 py-4 whitespace-nowrap text-xs sm:text-sm hidden xl:table-cell ${isDark ? "text-gray-400" : "text-gray-500"}`}>
                          {formatDate(appointment.created_at)}
                        </td>
                        <td className="px-3 sm:px-4 md:px-6 py-4 whitespace-nowrap text-right text-sm font-medium">
                          <div className="flex items-center justify-end gap-1 sm:gap-2" onClick={(e) => e.stopPropagation()}>
                            {appointment.status === "pending_review" && (
                              <>
                                <button
                                  onClick={() => handleScheduleClick(appointment)}
                                  className={`px-2 sm:px-3 py-1.5 text-xs sm:text-sm font-medium rounded-lg transition-colors ${
                                    isDark
                                      ? "bg-blue-600 hover:bg-blue-700 text-white"
                                      : "bg-blue-600 hover:bg-blue-700 text-white"
                                  }`}
                                  title="Schedule Appointment"
                                >
                                  <span className="hidden sm:inline">Schedule</span>
                                  <CalendarCheck className="w-4 h-4 sm:hidden" />
                                </button>
                                <button
                                  onClick={() => handleRejectClick(appointment)}
                                  className={`px-2 sm:px-3 py-1.5 text-xs sm:text-sm font-medium rounded-lg transition-colors ${
                                    isDark
                                      ? "bg-red-600 hover:bg-red-700 text-white"
                                      : "bg-red-600 hover:bg-red-700 text-white"
                                  }`}
                                  title="Reject Appointment"
                                >
                                  <span className="hidden sm:inline">Reject</span>
                                  <X className="w-4 h-4 sm:hidden" />
                                </button>
                              </>
                            )}
                            {appointment.moderator_join_url && (
                              <a
                                href={appointment.moderator_join_url}
                                target="_blank"
                                rel="noopener noreferrer"
                                className={`p-1.5 sm:p-2 rounded-lg transition-colors ${isDark ? "text-gray-300 hover:text-white hover:bg-gray-700" : "text-gray-600 hover:text-gray-900 hover:bg-gray-100"}`}
                                title="Join Meeting as Moderator"
                              >
                                <Video className="w-4 h-4" />
                              </a>
                            )}
                          </div>
                        </td>
                      </tr>
                    ))}
                  </tbody>
                </table>
              </div>
            </div>
          )}
        </main>

        {/* Schedule Appointment Dialog */}
        <ScheduleAppointmentDialog
          open={scheduleDialogOpen}
          onOpenChange={(open) => {
            setScheduleDialogOpen(open);
            if (!open) {
              setScheduledDate(undefined);
              setScheduledTime("09:00");
              setScheduledDuration(60);
            }
          }}
          appointment={selectedAppointment}
          scheduledDate={scheduledDate}
          setScheduledDate={setScheduledDate}
          scheduledTime={scheduledTime}
          setScheduledTime={setScheduledTime}
          scheduledDuration={scheduledDuration}
          setScheduledDuration={setScheduledDuration}
          onSchedule={handleSchedule}
          isScheduling={isScheduling}
          isDark={isDark}
        />

        {/* Reject Appointment Dialog */}
        <Dialog open={rejectDialogOpen} onOpenChange={setRejectDialogOpen}>
          <DialogContent className={`${isDark ? "bg-gray-800 border-gray-700" : "bg-white border-gray-200"}`}>
            <DialogHeader>
              <DialogTitle className={isDark ? "text-white" : "text-gray-900"}>
                Reject Appointment
              </DialogTitle>
              <DialogDescription className={isDark ? "text-gray-400" : "text-gray-500"}>
                {selectedAppointment && (
                  <>Reject appointment request from {selectedAppointment.first_name} {selectedAppointment.last_name}</>
                )}
              </DialogDescription>
            </DialogHeader>
            
            <div className="space-y-4 py-4">
              <div className="space-y-2">
                <label className={`text-sm font-medium ${isDark ? "text-gray-300" : "text-gray-700"}`}>
                  Rejection Reason (Optional)
                </label>
                <textarea
                  value={rejectionReason}
                  onChange={(e) => setRejectionReason(e.target.value)}
                  placeholder="Enter reason for rejection..."
                  rows={4}
                  className={`w-full rounded-md border px-3 py-2 text-sm ${
                    isDark
                      ? "bg-gray-700 border-gray-600 text-white placeholder:text-gray-400"
                      : "bg-white border-gray-300 text-gray-900 placeholder:text-gray-500"
                  }`}
                />
              </div>
            </div>

            <DialogFooter>
              <Button
                variant="outline"
                onClick={() => setRejectDialogOpen(false)}
                disabled={isRejecting}
                className={isDark ? "border-gray-700 text-gray-300 hover:bg-gray-700" : ""}
              >
                Cancel
              </Button>
              <Button
                onClick={handleReject}
                disabled={isRejecting}
                className="bg-red-600 hover:bg-red-700 text-white"
              >
                {isRejecting ? (
                  <>
                    <Loader2 className="w-4 h-4 mr-2 animate-spin" />
                    Rejecting...
                  </>
                ) : (
                  "Reject Appointment"
                )}
              </Button>
            </DialogFooter>
          </DialogContent>
        </Dialog>

        {/* Availability Management Dialog */}
        <Dialog open={availabilityDialogOpen} onOpenChange={setAvailabilityDialogOpen}>
          <DialogContent className={`max-w-2xl max-h-[90vh] overflow-y-auto ${isDark ? "bg-gray-800 border-gray-700" : "bg-white border-gray-200"}`}>
              <DialogHeader>
                <DialogTitle className={`text-xl sm:text-2xl font-semibold ${isDark ? "text-white" : "text-gray-900"}`}>
                  Manage Weekly Availability
                </DialogTitle>
              </DialogHeader>

            <div className="space-y-6 py-4">
              {isLoadingAdminAvailability ? (
                <div className="flex items-center justify-center py-8">
                  <Loader2 className="w-6 h-6 animate-spin text-rose-600" />
                </div>
              ) : (
                <>
                  {/* Days Selection with Time Ranges */}
                  <div className="space-y-4">
                    <div>
                      <label className={`text-sm font-medium mb-3 block ${isDark ? "text-gray-300" : "text-gray-700"}`}>
                        Available Days & Times *
                      </label>
                      <p className={`text-xs mb-3 ${isDark ? "text-gray-400" : "text-gray-500"}`}>
                        Select days and choose time slots (Morning, Afternoon, Evening) for each day
                      </p>
                    </div>

                    <div className="space-y-3">
                      {daysOfWeek.map((day) => {
                        const isSelected = selectedDays.includes(day.value);
                        
                        return (
                          <div
                            key={day.value}
                            className={`rounded-lg border p-4 transition-all ${
                              isSelected
                                ? isDark
                                  ? "bg-rose-500/10 border-rose-500/30"
                                  : "bg-rose-50 border-rose-200"
                                : isDark
                                ? "bg-gray-700/50 border-gray-600"
                                : "bg-gray-50 border-gray-200"
                            }`}
                          >
                            <div className="flex items-start justify-between gap-4 mb-3">
                              <button
                                type="button"
                                onClick={() => handleDayToggle(day.value)}
                                className={`flex items-center gap-2 flex-1 ${
                                  isSelected ? "cursor-pointer" : "cursor-pointer"
                                }`}
                              >
                                <div
                                  className={`w-5 h-5 rounded border-2 flex items-center justify-center flex-shrink-0 ${
                                    isSelected
                                      ? isDark
                                        ? "bg-rose-600 border-rose-500"
                                        : "bg-rose-500 border-rose-500"
                                      : isDark
                                      ? "border-gray-500"
                                      : "border-gray-300"
                                  }`}
                                >
                                  {isSelected && <Check className="w-3 h-3 text-white" />}
                                </div>
                                <span className={`text-sm font-medium ${isDark ? "text-white" : "text-gray-900"}`}>
                                  {day.label}
                                </span>
                              </button>
                            </div>

                            {isSelected && (
                              <div className="mt-3 pt-3 border-t border-gray-300 dark:border-gray-600">
                                <label className={`text-xs font-medium mb-2 block ${isDark ? "text-gray-400" : "text-gray-600"}`}>
                                  Available Time Slots
                                </label>
                                <div className="flex flex-wrap gap-2">
                                  {timeSlotOptions.map((slot) => {
                                    const isSelectedSlot = dayTimeSlots[day.value]?.includes(slot.value) || false;
                                    return (
                                      <button
                                        key={slot.value}
                                        type="button"
                                        onClick={() => handleTimeSlotToggle(day.value, slot.value)}
                                        className={`px-3 py-1.5 rounded-lg text-xs font-medium border transition-all ${
                                          isSelectedSlot
                                            ? isDark
                                              ? "bg-rose-600 border-rose-500 text-white"
                                              : "bg-rose-500 border-rose-500 text-white"
                                            : isDark
                                            ? "bg-gray-700 border-gray-600 text-gray-300 hover:border-rose-500"
                                            : "bg-white border-gray-300 text-gray-700 hover:border-rose-500"
                                        }`}
                                      >
                                        {slot.label}
                                      </button>
                                    );
                                  })}
                                </div>
                              </div>
                            )}
                          </div>
                        );
                      })}
                    </div>
                  </div>
                </>
              )}
            </div>

            <DialogFooter>
              <Button
                variant="outline"
                onClick={() => {
                  setAvailabilityDialogOpen(false);
                  if (adminAvailability?.available_days) {
                    setSelectedDays(adminAvailability.available_days);
                  }
                }}
                disabled={isUpdatingAvailability}
                className={isDark ? "border-gray-700 text-gray-300 hover:bg-gray-700" : ""}
              >
                Cancel
              </Button>
              <Button
                onClick={handleSaveAvailability}
                disabled={isUpdatingAvailability || selectedDays.length === 0}
                className="bg-gradient-to-r from-rose-500 to-pink-600 hover:from-rose-600 hover:to-pink-700 text-white"
              >
                {isUpdatingAvailability ? (
                  <>
                    <Loader2 className="w-4 h-4 mr-2 animate-spin" />
                    Saving...
                  </>
                ) : (
                  <>
                    <Check className="w-4 h-4 mr-2" />
                    Save Availability
                  </>
                )}
              </Button>
            </DialogFooter>
          </DialogContent>
        </Dialog>

    </div>
  );
}