import { DateTime } from "luxon";
import { useState, useEffect } from "react";
import { Button } from "~/components/ui/button";
import {
  ChevronLeft,
  ChevronRight,
  Star,
  Filter,
  X,
  Users,
  User,
  ArrowUpDown,
} from "lucide-react";
import {
  Select,
  SelectContent,
  SelectItem,
  SelectTrigger,
  SelectValue,
} from "~/components/ui/select";
import { Label } from "~/components/ui/label";
import { Tabs, TabsList, TabsTrigger } from "~/components/ui/tabs";
import {
  Collapsible,
  CollapsibleContent,
  CollapsibleTrigger,
} from "~/components/ui/collapsible";
import DatePickerWithRange from "~/components/home/date-picker";
import BottomNavigation from "~/components/home/bottom-nav";
import Error from "~/components/error";
import { useSearchParams } from "react-router";
import { useColles } from "~/lib/api";
import TabContent from "~/components/home/tab-content";

export default function Home() {
  // Handle query parameters
  const [query, setQuery] = useSearchParams();
  const updateQuery = (key: string, value: string) => {
    if (query.get(key) !== value) {
      setQuery((prev) => {
        const newQuery = new URLSearchParams(prev);
        newQuery.set(key, value);
        return newQuery;
      });
    }
  };

  // Tabs
  const activeTab = query.get("view") || "you";
  const setActiveTab = (tab: string) => updateQuery("view", tab);

  // Date
  const rawStartDate = query.get("start");
  const startDate = rawStartDate
    ? DateTime.fromISO(rawStartDate, { zone: "local" })
    : DateTime.now().startOf("week");

  const setStartDate = (date: DateTime) =>
    updateQuery("start", date.startOf("week").toISODate()!);

  const handlePreviousWeek = () => {
    const previousWeek = startDate.minus({ weeks: 1 });
    setStartDate(previousWeek);
  };

  const handleNextWeek = () => {
    const nextWeek = startDate.plus({ weeks: 1 });
    setStartDate(nextWeek);
  };

  // Fetch colles from API
  const { studentColles, classColles, favoriteColles, error, isLoading } =
    useColles(startDate);
  console.log("Colles loaded:", {
    studentColles,
    classColles,
    favoriteColles,
    error,
    isLoading,
  });

  // Error handling (after all hooks)
  if (error)
    return (
      <Error
        title="Impossible de charger les colles"
        message={error?.toString()}
        code={500}
        description="Une erreur s'est produite lors du chargement de la liste des colles."
      />
    );

  // TODO: FAVORITES
  const useToggleStar = (auth: any) => {};
  // TODO: FILTERS
  const getSessionFilter = (key: string) => {
    const filter = sessionStorage.getItem(key);
    if (filter) {
      return filter;
    }
    return "all";
  };
  const [subjectFilter, setSubjectFilter] = useState<string>(
    getSessionFilter("subject")
  );
  const [examinerFilter, setExaminerFilter] = useState<string>(
    getSessionFilter("examiner")
  );
  // const [studentFilter, setStudentFilter] = useState<string>("all")
  const [isFilterOpen, setIsFilterOpen] = useState(
    getSessionFilter("subject") !== "all" ||
      getSessionFilter("examiner") !== "all"
  );
  useEffect(() => {
    sessionStorage.setItem("subject", subjectFilter);
    sessionStorage.setItem("examiner", examinerFilter);
    // sessionStorage.setItem('student', studentFilter)
  }, [subjectFilter, examinerFilter]);

  return (
    <div className="space-y-6 pb-20 md:pb-0">
      {/* Week Navigation */}
      <div className="mb-4">
        <div className="flex flex-row items-center justify-between gap-4">
          <div className="flex-1">
            <DatePickerWithRange
              startDate={startDate}
              setStartDate={setStartDate}
            />
          </div>
          <div className="flex items-center space-x-2">
            <Button variant="outline" size="sm" onClick={handlePreviousWeek}>
              <ChevronLeft className="h-4 w-4" />
            </Button>
            <Button variant="outline" size="sm" onClick={handleNextWeek}>
              <ChevronRight className="h-4 w-4" />
            </Button>
          </div>
        </div>
      </div>

      <Tabs
        defaultValue="all"
        value={activeTab}
        onValueChange={setActiveTab}
        className="hidden md:block"
      >
        <div className="mb-4">
          <TabsList className="w-full">
            <TabsTrigger
              value="you"
              className="flex-1 flex items-center justify-center gap-1"
            >
              <User className="h-4 w-4" />
              Vos colles ({studentColles.length})
            </TabsTrigger>
            <TabsTrigger
              value="favorites"
              className="flex-1 flex items-center justify-center gap-1"
            >
              <Star className="h-4 w-4" />
              Vos favoris ({0 /* TODO: stars.length */})
            </TabsTrigger>
            <TabsTrigger
              value="class"
              className="flex-1 flex items-center justify-center gap-1"
            >
              <Users className="h-4 w-4" />
              Votre classe ({classColles.length})
            </TabsTrigger>
          </TabsList>
        </div>
      </Tabs>

      {/* TODO: Filter component */}
      <Collapsible open={isFilterOpen} onOpenChange={setIsFilterOpen}>
        <div className="flex justify-between">
          <div className="flex gap-2">
            {activeTab === "all" && (
              <>
                <Button
                  variant="outline"
                  size="sm"
                  // TODO: Implement sorting
                  onClick={() => {}}
                >
                  <ArrowUpDown className="h-4 w-4" />
                </Button>
                <div className="flex mb-4">
                  <CollapsibleTrigger asChild>
                    <Button variant="outline" size="sm">
                      {isFilterOpen ? (
                        <>
                          <X className="h-4 w-4 mr-2" />
                          Fermer
                        </>
                      ) : (
                        <>
                          <Filter className="h-4 w-4 mr-2" />
                          Recherche
                        </>
                      )}
                    </Button>
                  </CollapsibleTrigger>
                </div>
              </>
            )}
          </div>
          {/* TODO: DEBUG */}
          {/* {activeTab === "all" &&
            (getWeekStart().getTime() != startDate.getTime() ? (
              <Button variant="outline" size="sm" onClick={resetWeek}>
                <CalendarArrowUp className="h-4 w-4 mr-2" />
                Cette semaine
              </Button>
            ) : (
              <Button variant="outline" size="sm" onClick={goPastYear}>
                <CalendarArrowDown className="h-4 w-4 mr-2" />
                Colles des spés
              </Button>
            ))} */}
        </div>

        <CollapsibleContent className="space-y-4">
          <div className="grid grid-cols-1 md:grid-cols-3 gap-4">
            <div className="space-y-2">
              <Label htmlFor="subject-filter">Filtrer par matière</Label>
              <Select value={subjectFilter} onValueChange={setSubjectFilter}>
                <SelectTrigger id="subject-filter">
                  <SelectValue placeholder="Toutes les matières" />
                </SelectTrigger>
                <SelectContent>
                  <SelectItem value="all">Toutes les matières</SelectItem>
                  {/* TODO: */}
                  {/* {uniqueTopics.map((subject) => (
                    <SelectItem key={subject} value={subject}>
                      {subject}
                    </SelectItem>
                  ))} */}
                </SelectContent>
              </Select>
            </div>

            <div className="space-y-2">
              <Label htmlFor="examiner-filter">Filtrer par colleur</Label>
              <Select value={examinerFilter} onValueChange={setExaminerFilter}>
                <SelectTrigger id="examiner-filter">
                  <SelectValue placeholder="Tous les colleurs" />
                </SelectTrigger>
                <SelectContent>
                  <SelectItem value="all">Tous les colleurs</SelectItem>
                  {/* TODO: */}
                  {/* {uniqueExaminers.map((examiner) => (
                    <SelectItem key={examiner} value={examiner}>
                      {examiner}
                    </SelectItem>
                  ))} */}
                </SelectContent>
              </Select>
            </div>

            {/* <div className="space-y-2">
                <Label htmlFor="student-filter">Filtrer par élève</Label>
                <Select value={studentFilter} onValueChange={setStudentFilter}>
                  <SelectTrigger id="student-filter">
                    <SelectValue placeholder="Tous les élèves" />
                  </SelectTrigger>
                  <SelectContent>
                    <SelectItem value="all">Tous les élèves</SelectItem>
                    {uniqueStudents.map((student) => (
                      <SelectItem key={student} value={student}>
                        {student}
                      </SelectItem>
                    ))}
                  </SelectContent>
                </Select>
              </div> */}
          </div>

          <div className="flex justify-end">
            <Button variant="outline" size="sm">
              {/* //TODO: onClick={resetFilters} */}
              Réinitialiser les filtres
            </Button>
          </div>
        </CollapsibleContent>
      </Collapsible>

      {/* Tab Content */}
      <div>
        {/* Your Colles Tab */}
        {activeTab === "you" && (
          <TabContent
            tabTitle="Vos colles"
            emptyCollesText="Vous n'avez pas encore de colle cette semaine."
            isLoading={isLoading}
            colles={studentColles}
          />
        )}

        {/* Favorites Tab */}
        {activeTab === "favorites" && (
          <TabContent
            tabTitle="Vos favoris"
            emptyCollesText="Vous n'avez pas encore de colle favorite, cliquez sur l'étoile pour ajouter une colle à vos favoris."
            isLoading={isLoading}
            colles={favoriteColles}
          />
        )}
      </div>

      {/* Class Colles Tab */}
      {activeTab === "class" && (
        <TabContent
          tabTitle="Les colles de la classe"
          emptyCollesText="Aucune colle trouvée."
          isLoading={isLoading}
          colles={classColles}
        />
      )}

      {/* Bottom Navigation for Mobile */}
      <BottomNavigation
        activeTab={activeTab}
        onTabChange={setActiveTab}
        // TODO: Implement favorite count
        favoriteCount={0}
      />
    </div>
  );
}
