import { useState } from "react";
import { useQuery } from "@tanstack/react-query";
import { Input } from "@/components/ui/input";
import { Button } from "@/components/ui/button";
import { Card, CardContent, CardHeader, CardTitle } from "@/components/ui/card";
import {
  Search,
  Edit,
  Eye,
  ChevronLeft,
  ChevronRight,
  Settings,
} from "lucide-react";
import { useAuth } from "@/hooks/use-auth";
import { cn } from "@/lib/utils";
import {
  Select,
  SelectContent,
  SelectItem,
  SelectTrigger,
  SelectValue,
} from "@/components/ui/select";
import { Patient } from "@repo/db/types";
import { formatDateToHumanReadable } from "@/utils/dateUtils";

export default function ReportsPage() {
  const { user } = useAuth();
  const [isMobileMenuOpen, setIsMobileMenuOpen] = useState(false);
  const [searchTerm, setSearchTerm] = useState("");
  const [searchField, setSearchField] = useState("all");
  const [currentPage, setCurrentPage] = useState(1);
  const itemsPerPage = 5;

  // Fetch patients
  const { data: patients = [], isLoading: isLoadingPatients } = useQuery<
    Patient[]
  >({
    queryKey: ["/api/patients"],
    enabled: !!user,
  });

  // Filter patients based on search
  const filteredPatients = patients.filter((patient) => {
    if (!searchTerm) return true;

    const searchLower = searchTerm.toLowerCase();
    const fullName = `${patient.firstName} ${patient.lastName}`.toLowerCase();
    const patientId = `PID-${patient?.id?.toString().padStart(4, "0")}`;

    switch (searchField) {
      case "name":
        return fullName.includes(searchLower);
      case "id":
        return patientId.toLowerCase().includes(searchLower);
      case "phone":
        return patient.phone?.toLowerCase().includes(searchLower) || false;
      case "all":
      default:
        return (
          fullName.includes(searchLower) ||
          patientId.toLowerCase().includes(searchLower) ||
          patient.phone?.toLowerCase().includes(searchLower) ||
          patient.email?.toLowerCase().includes(searchLower) ||
          false
        );
    }
  });

  // Pagination
  const totalPages = Math.ceil(filteredPatients.length / itemsPerPage);
  const startIndex = (currentPage - 1) * itemsPerPage;
  const endIndex = startIndex + itemsPerPage;
  const currentPatients = filteredPatients.slice(startIndex, endIndex);

  const toggleMobileMenu = () => {
    setIsMobileMenuOpen(!isMobileMenuOpen);
  };

  const getPatientInitials = (firstName: string, lastName: string) => {
    return `${firstName.charAt(0)}${lastName.charAt(0)}`.toUpperCase();
  };

  return (
    <div>
      <div className="max-w-7xl mx-auto">
        {/* Header */}
        <div className="mb-6">
          <h1 className="text-2xl font-semibold text-gray-900 mb-2">Reports</h1>
          <p className="text-gray-600">
            View and manage all patient information
          </p>
        </div>

        {/* Search and Filters */}
        <Card className="mb-6">
          <CardContent className="p-4">
            <div className="flex flex-col md:flex-row gap-4">
              <div className="flex-1 relative">
                <Search className="absolute left-3 top-1/2 transform -translate-y-1/2 text-gray-400 h-4 w-4" />
                <Input
                  placeholder="Search patients..."
                  value={searchTerm}
                  onChange={(e) => setSearchTerm(e.target.value)}
                  className="pl-10"
                />
              </div>
              <div className="flex gap-2">
                <Select value={searchField} onValueChange={setSearchField}>
                  <SelectTrigger className="w-32">
                    <SelectValue />
                  </SelectTrigger>
                  <SelectContent>
                    <SelectItem value="all">All Fields</SelectItem>
                    <SelectItem value="name">Name</SelectItem>
                    <SelectItem value="id">Patient ID</SelectItem>
                    <SelectItem value="phone">Phone</SelectItem>
                  </SelectContent>
                </Select>
                <Button variant="outline" size="sm">
                  <Settings className="h-4 w-4 mr-2" />
                  Advanced
                </Button>
              </div>
            </div>
          </CardContent>
        </Card>

        {/* Patient List */}
        <Card>
          <CardContent className="p-0">
            {isLoadingPatients ? (
              <div className="text-center py-8">Loading patients...</div>
            ) : (
              <>
                {/* Table Header */}
                <div className="grid grid-cols-12 gap-4 p-4 bg-gray-50 border-b text-sm font-medium text-gray-600">
                  <div className="col-span-3">Patient</div>
                  <div className="col-span-2">DOB / Gender</div>
                  <div className="col-span-2">Contact</div>
                  <div className="col-span-2">Insurance</div>
                  <div className="col-span-2">Status</div>
                  <div className="col-span-1">Actions</div>
                </div>

                {/* Table Rows */}
                {currentPatients.length === 0 ? (
                  <div className="text-center py-8 text-gray-500">
                    {searchTerm
                      ? "No patients found matching your search."
                      : "No patients available."}
                  </div>
                ) : (
                  currentPatients.map((patient) => (
                    <div
                      key={patient.id}
                      className="grid grid-cols-12 gap-4 p-4 border-b hover:bg-gray-50 transition-colors"
                    >
                      {/* Patient Info */}
                      <div className="col-span-3 flex items-center space-x-3">
                        <div className="w-10 h-10 bg-gray-200 rounded-full flex items-center justify-center text-sm font-medium text-gray-600">
                          {getPatientInitials(
                            patient.firstName,
                            patient.lastName
                          )}
                        </div>
                        <div>
                          <div className="font-medium text-gray-900">
                            {patient.firstName} {patient.lastName}
                          </div>
                          <div className="text-sm text-gray-500">
                            PID-{patient.id?.toString().padStart(4, "0")}
                          </div>
                        </div>
                      </div>

                      {/* DOB / Gender */}
                      <div className="col-span-2">
                        <div className="text-sm text-gray-900">
                          {formatDateToHumanReadable(patient.dateOfBirth)}
                        </div>
                        <div className="text-sm text-gray-500 capitalize">
                          {patient.gender}
                        </div>
                      </div>

                      {/* Contact */}
                      <div className="col-span-2">
                        <div className="text-sm text-gray-900">
                          {patient.phone || "Not provided"}
                        </div>
                        <div className="text-sm text-gray-500">
                          {patient.email || "No email"}
                        </div>
                      </div>

                      {/* Insurance */}
                      <div className="col-span-2">
                        <div className="text-sm text-gray-900">
                          {patient.insuranceProvider
                            ? `${patient.insuranceProvider.charAt(0).toUpperCase()}${patient.insuranceProvider.slice(1)}`
                            : "Not specified"}
                        </div>
                        <div className="text-sm text-gray-500">
                          ID: {patient.insuranceId || "N/A"}
                        </div>
                      </div>

                      {/* Status */}
                      <div className="col-span-2">
                        <span
                          className={cn(
                            "inline-flex items-center px-2.5 py-0.5 rounded-full text-xs font-medium",
                            patient.status === "active"
                              ? "bg-green-100 text-green-800"
                              : "bg-gray-100 text-gray-800"
                          )}
                        >
                          {patient.status === "active" ? "Active" : "Inactive"}
                        </span>
                      </div>

                      {/* Actions */}
                      <div className="col-span-1">
                        <div className="flex space-x-1">
                          <Button
                            variant="ghost"
                            size="sm"
                            className="h-8 w-8 p-0"
                          >
                            <Edit className="h-4 w-4 text-blue-600" />
                          </Button>
                          <Button
                            variant="ghost"
                            size="sm"
                            className="h-8 w-8 p-0"
                          >
                            <Eye className="h-4 w-4 text-gray-600" />
                          </Button>
                        </div>
                      </div>
                    </div>
                  ))
                )}

                {/* Pagination */}
                {totalPages > 1 && (
                  <div className="flex items-center justify-between p-4 border-t bg-gray-50">
                    <div className="text-sm text-gray-700">
                      Showing {startIndex + 1} to{" "}
                      {Math.min(endIndex, filteredPatients.length)} of{" "}
                      {filteredPatients.length} results
                    </div>
                    <div className="flex items-center space-x-2">
                      <Button
                        variant="outline"
                        size="sm"
                        onClick={() =>
                          setCurrentPage(Math.max(1, currentPage - 1))
                        }
                        disabled={currentPage === 1}
                      >
                        <ChevronLeft className="h-4 w-4 mr-1" />
                        Previous
                      </Button>

                      {/* Page Numbers */}
                      {Array.from({ length: totalPages }, (_, i) => i + 1).map(
                        (page) => (
                          <Button
                            key={page}
                            variant={
                              currentPage === page ? "default" : "outline"
                            }
                            size="sm"
                            onClick={() => setCurrentPage(page)}
                            className="w-8 h-8 p-0"
                          >
                            {page}
                          </Button>
                        )
                      )}

                      <Button
                        variant="outline"
                        size="sm"
                        onClick={() =>
                          setCurrentPage(Math.min(totalPages, currentPage + 1))
                        }
                        disabled={currentPage === totalPages}
                      >
                        Next
                        <ChevronRight className="h-4 w-4 ml-1" />
                      </Button>
                    </div>
                  </div>
                )}
              </>
            )}
          </CardContent>
        </Card>
      </div>
    </div>
  );
}