import React, { FormEvent, useState, useEffect } from "react";
import { useNavigate, useLocation } from "react-router-dom";
import isLength from "validator/lib/isLength";
import equals from "validator/lib/equals";
import { catchErrors } from "../helpers";
import { PostType } from "../types";
import { postApi } from "../apis";
import { PostState } from "./intopost";
import { FileType } from "./intopost";

export function EditPost() {
  const [city, setCity] = useState<string>("city");
  const [theme, setTheme] = useState<string>("theme");
  const [title, setTitle] = useState<string>("");
  const [text, setText] = useState<string>("");
  const [file, setFile] = useState<FileList>();
  const [imgSrc, setImgSrc] = useState<string[]>();
  const [filesList, setFilesList] = useState<FileType[]>();
  const navigate = useNavigate();
  const location = useLocation() as PostState;

  const post = location.state;

  const [user, setUser] = useState<PostType>({
    title: post.title,
    text: post.text,
    theme: post.theme,
    city: post.city,
    date: post.date,
    user: post.user,
    counts: post.counts,
    _id: post._id,
  });

  const [loading, setLoading] = useState(false);
  const [error, setError] = useState("");
  const [disabled, setDisabled] = useState(false);
  const [success, setSuccess] = useState(false);

  useEffect(() => {
    getFilesList(post._id);
  }, []);

  const imgArr = new Array();

  const getFilesList = async (postId: string) => {
    const res = await postApi.getFileByPostId(postId); //_id는 req.params에 항상 같이 보낸다
    setFilesList(res);
  };

  const updateImg2Db = async (filelist: FileList) => {
    const formdata = new FormData();
    formdata.append("title", user.title);
    formdata.append("text", user.text);
    formdata.append("theme", user.theme);
    formdata.append("city", user.city);
    if (filelist === undefined || filelist === null) {
      const res = await postApi.updateImgAndPost(user._id, formdata);
    } else {
      for (var i = 0; i < filelist.length; i++) {
        formdata.append("picture", filelist?.[i]);
      }
      const res = await postApi.updateImgAndPost(user._id, formdata);
    }
  };

  async function reWriteSubmit(event: FormEvent) {
    event.preventDefault();
    try {
      if (confirm("게시물을 수정하시겠습니까?") == true) {
        setError("");
        // console.log("user data", user);
        if (postingFormMatch(user) === true) {
          setLoading(true);
          if (file) {
            const res = updateImg2Db(file);
            // console.log(res);
          }
          navigate("/board", { replace: true });
          setSuccess(true);
          setError("");
        }
      } else {
        return false;
      }
    } catch (error) {
      console.log("에러발생");
      catchErrors(error, setError);
    } finally {
      setLoading(false);
    }
  }

  const handleInputPic = async (event: React.ChangeEvent<HTMLInputElement>) => {
    const maxImg = 10;
    const { files } = event.target;

    if (!(files === null)) {
      setFile(files);
    }

    if (!(files?.length === undefined)) {
      if (files?.length <= maxImg) {
        for (var i = 0; i < files.length; i++) {
          const reader = new FileReader();
          reader.readAsDataURL(files?.[i]);

          reader.onload = (e) => {
            imgArr.push(e.target?.result);
            setImgSrc(imgArr);
          };
        }
      } else {
        alert(`사진은 최대 ${maxImg}장까지 업로드 가능합니다!`);
      }
    }
  };

  function postingFormMatch(user: PostType) {
    if (!isLength(user.title ?? "", { min: 1 })) {
      setError("제목을 입력해 주세요.");
      alert("제목을 입력해 주세요.");
      return false;
    } else if (!isLength(user.text ?? "", { min: 1 })) {
      alert("내용을 입력해 주세요.");
      setError("내용을 입력해 주세요.");
      return false;
    } else if (equals(user.city, "city")) {
      alert("도시를 선택해 주세요.");
      setError("도시를 선택해 주세요.");
      return false;
    } else if (equals(user.theme, "theme")) {
      alert("테마를 선택해 주세요.");
      setError("테마를 선택해 주세요.");
      return false;
    } else {
      return true;
    }
  }

  const titleChange = (event: React.ChangeEvent<HTMLTextAreaElement>) => {
    const title = event.currentTarget.value;
    const newUser = { ...user, title: title };
    console.log(event.currentTarget.value);
    setTitle(event.currentTarget.value);
    setUser(newUser);
  };

  const textChange = (event: React.ChangeEvent<HTMLTextAreaElement>) => {
    const text = event.currentTarget.value;
    const newUser = { ...user, text: text };
    console.log(event.currentTarget.value);
    setText(event.currentTarget.value);
    setUser(newUser);
  };

  const cityChange = (event: React.ChangeEvent<HTMLSelectElement>) => {
    const city = event.currentTarget.value;
    const newUser = { ...user, city: city };
    console.log(event.currentTarget.value);
    setCity(event.currentTarget.value);
    setUser(newUser);
  };

  const themeChange = (event: React.ChangeEvent<HTMLSelectElement>) => {
    const theme = event.currentTarget.value;
    const newUser = { ...user, theme: theme };
    console.log(event.currentTarget.value);
    setTheme(event.currentTarget.value);
    setUser(newUser);
  };

  return (
    <div className="flex place-content-center">
      <form
        onSubmit={reWriteSubmit}
        className="flex flex-col w-96 items-center"
      >
        <div className="flex flex-row h-8 gap-x-1">
          <div className="flex border-2 border-sky-400 rounded-full w-20 place-content-center transition ease-in-out delay-150 bg-white-400 hover:-translate-y-1 hover:scale-110 hover:bg-gray-300 duration-300">
            <input
              id="files"
              type="file"
              multiple
              onChange={handleInputPic}
              className="hidden"
            />
            <label htmlFor="files" className="text-xs mt-1.5 ml-1 ">
              파일 선택
            </label>
          </div>

          <div className="flex w-20">
            <select
              name="city"
              className="border-2 border-sky-400 rounded-full w-20 text-xs"
              onChange={cityChange}
              defaultValue={post.city}
            >
              <option value="city">도시</option>
              <option value="Seoul">서울</option>
              <option value="Busan">부산</option>
              <option value="Incheon">인천</option>
              <option value="Daegu">대구</option>
              <option value="Gwangju">광주</option>
              <option value="Daejeon">대전</option>
              <option value="Woolsan">울산</option>
              <option value="Sejong">세종</option>
              <option value="Dokdo">독도</option>
              <option value="Jeju">제주</option>
            </select>
          </div>

          <div className="flex w-20">
            <select
              name="theme"
              className="border-2 border-sky-400 rounded-full w-20 text-xs"
              onChange={themeChange}
              defaultValue={post.theme}
            >
              <option value="theme">테마</option>
              <option value="cycling">사이클링</option>
              <option value="surfing">서핑</option>
              <option value="activity">액티비티</option>
              <option value="camping">캠핑</option>
              <option value="sking">스키</option>
              <option value="boat">보트</option>
              <option value="desert">사막</option>
              <option value="golf">골프</option>
              <option value="cave">동굴</option>
              <option value="history">문화재</option>
              <option value="zoo">동물원</option>
              <option value="cycling">사이클링</option>
            </select>
          </div>

          <div className="flex w-20">
            <button
              type="submit"
              className="border-2 border-sky-400 rounded-full w-20 text-xs text-center transition delay-150 bg-white-400 hover:-translate-y-1 hover:scale-110 hover:bg-sky-300 duration-300"
            >
              수정
            </button>
          </div>
        </div>

        <div className="flex flex-col">
          <textarea
            name="title"
            onChange={titleChange}
            placeholder="제목을 입력해 주세요!"
            className="flex w-96 border-2 border-sky-500 rounded"
          />
          <div className="flex flex-col mt-1 mb-1">
            <div className="flex gap-x-2 h-48 overflow-x-scroll">
              {filesList?.map((file, i) => (
                <img
                  key={i}
                  src={"http://localhost:3000/images/" + file.newfilename}
                  width={200}
                  height={200}
                />
              ))}
            </div>
          </div>
          <textarea
            onChange={textChange}
            name="text"
            placeholder="여행 후기를 알려주세요!"
            className="flex w-96 h-96 border-2 border-sky-500 rounded"
          />
        </div>
      </form>
    </div>
  );
}