"use client";

import { useSearchParams } from "next/navigation";
import { useRouter } from "next/navigation";
import { useEffect, useState } from "react";
import Header from "@/components/Header";
import DestructibleAlert from "@/components/DestructibleAlert";
import BackgroundWrapper from "@/components/BackgroundWrapper";
import { API_URL } from "@/lib/auth";
import { Loader, RefreshCw } from "lucide-react";
import { v4 as uuidv4 } from "uuid";
import { useAuth } from "@/context/AuthContext";

interface Mock {
  id: string;
  title: string;
  rating: number;
}
export default function PaperScreen() {
  const router = useRouter();
  const searchParams = useSearchParams();
  const name = searchParams.get("name") || "";
  const {user} = useAuth()

  const [questions, setQuestions] = useState<Mock[] | null>(null);
  const [errorMsg, setErrorMsg] = useState<string | null>(null);
  const [refreshing, setRefreshing] = useState<boolean>(false);
  const [componentKey, setComponentKey] = useState<number>(0);

interface Subject {
  subject_id: string;
  name: string;
  unit: string;
}

const [subjects, setSubjects] = useState<Subject[]>([
  {
    subject_id: uuidv4(),
    name: "Biology",
    unit: "Science"
  },
  {
    subject_id: uuidv4(),
    name: "Chemistry",
    unit: "Science"
  },
  {
    subject_id: uuidv4(),
    name: "Physics",
    unit: "Science"
  },
  {
    subject_id: uuidv4(),
    name: "Accounting",
    unit: "Business"
  },
  {
    subject_id: uuidv4(),
    name: "Finance",
    unit: "Business"
  },
  {
    subject_id: uuidv4(),
    name: "Marketing",
    unit: "Business"
  },
  {
    subject_id: uuidv4(),
    name: "History",
    unit: "Humanities"
  },
  {
    subject_id: uuidv4(),
    name: "Geography",
    unit: "Humanities"
  },
  {
    subject_id: uuidv4(),
    name: "Sociology",
    unit: "Humanities"
  },
]);



  // async function fetchMocks() {
  //   try {
  //     const questionResponse = await fetch(`${API_URL}/mocks`, {
  //       method: "GET",
  //     });
  //     const fetchedQuestionData: Mock[] = await questionResponse.json();
  //     setQuestions(fetchedQuestionData);
  //   } catch (error) {
  //     setErrorMsg(error instanceof Error ? error.message : "An error occurred");
  //   }
  // }

  // useEffect(() => {
  //   if (name) {
  //     fetchMocks();
  //   }
  // }, [name]);

  const onRefresh = async () => {
    setRefreshing(true);

    setSubjects([{
    subject_id: uuidv4(),
    name: "Biology",
    unit: "Science"
  },
  {
    subject_id: uuidv4(),
    name: "Chemistry",
    unit: "Science"
  },
  {
    subject_id: uuidv4(),
    name: "Physics",
    unit: "Science"
  },
  {
    subject_id: uuidv4(),
    name: "Accounting",
    unit: "Business Studies"
  },
  {
    subject_id: uuidv4(),
    name: "Finance",
    unit: "Business Studies"
  },
  {
    subject_id: uuidv4(),
    name: "Marketing",
    unit: "Business Studies"
  },
  {
    subject_id: uuidv4(),
    name: "History",
    unit: "Humanities"
  },
  {
    subject_id: uuidv4(),
    name: "Geography",
    unit: "Humanities"
  },
  {
    subject_id: uuidv4(),
    name: "Sociology",
    unit: "Humanities"
  }])
    setComponentKey((prevKey) => prevKey + 1);
    setTimeout(() => {
      setRefreshing(false);
    }, 1000);
  };

  if (errorMsg) {
    return (
      <BackgroundWrapper>
        <Header displayTabTitle={name} />
        <div className="overflow-y-auto">
          <div className="mt-5 px-5">
            <DestructibleAlert text={errorMsg} extraStyles="" />
          </div>
          <div className="flex justify-center mt-4">
            <button
              onClick={onRefresh}
              disabled={refreshing}
              className="px-4 py-2 bg-blue-500 text-white rounded hover:bg-blue-600 disabled:opacity-50"
            >
              {refreshing ? <Loader /> : <RefreshCw />}
            </button>
          </div>
        </div>
      </BackgroundWrapper>
    );
  }

  return (
    <BackgroundWrapper>
      <div>
        <Header displayTabTitle="Subjects" />
        <div className="mx-10 pt-10 overflow-y-auto">
          <h1 className="text-2xl font-semibold mb-5">{user?.preparation_unit}</h1>
          <div className="border border-[#c0dafc] flex flex-col gap-4 w-full rounded-[25px] p-4 mb-20">
            {subjects ? (
              subjects
              .filter(subject => subject.unit === user?.preparation_unit)
              .map((subject) => (
                <div key={subject.subject_id}>
                <button
                  onClick={() =>
                  router.push(
                    `/exam/pretest?unitname=${name}&id=${subject.subject_id}&title=${subject.name}`
                  )
                  }
                  className="w-full border-2 border-[#B0C2DA] py-4 rounded-[10px] px-6 space-y-2 text-left hover:bg-gray-50 transition-colors"
                >
                  <h3 className="text-xl font-medium">{subject.name}</h3>
                  <p className="text-md font-normal">
                  Rating: 8/10
                  </p>
                </button>
                </div>
              ))
            ) : (
              <div className="flex flex-col items-center justify-center">
              <div className="animate-spin rounded-full h-12 w-12 border-b-2 border-blue-500 mb-4"></div>
              <p className="text-xl font-medium text-center">Loading...</p>
              </div>
            )}
          </div>
          <div className="flex justify-center mt-4">
            <button
              onClick={onRefresh}
              disabled={refreshing}
              className="p-2 bg-blue-500 text-white hover:bg-blue-600 disabled:opacity-50 rounded-full"
            >
              {refreshing ? <Loader /> : <RefreshCw />}
            </button>
          </div>
        </div>
      </div>
      {/* <CustomBackHandler fallbackRoute="unit" useCustomHandler={false} /> */}
    </BackgroundWrapper>
  );
}