"use client";

import React, { useEffect, useMemo, useState } from "react";

import Image from "next/image";

import clsx from "clsx";

import { UploadCloud, X } from "lucide-react";

import { toastError, toastWarn } from "@/common/funcs/toast";

import { UploadImageProps } from "./interface";

const MAXIMUM_FILE = 10; // MB

const ACCEPT_TYPES = ["image/jpeg", "image/jpg", "image/png"];

/* =========================
   COMPONENT
========================= */

const UploadImage = ({
  label,
  name,
  path,
  file,
  setFile,
  resetPath,
  isWidthFull = true,
  disabled = false,
}: UploadImageProps) => {
  const [dragging, setDragging] = useState(false);

  /* =========================
     PREVIEW IMAGE
  ========================= */

  const imagePreview = useMemo(() => {
    if (!file) return "";

    return URL.createObjectURL(file);
  }, [file]);

  /* =========================
     CLEANUP OBJECT URL
  ========================= */

  useEffect(() => {
    return () => {
      if (imagePreview) {
        URL.revokeObjectURL(imagePreview);
      }
    };
  }, [imagePreview]);

  /* =========================
     VALIDATE FILE
  ========================= */

  const validateFile = (selectedFile: File | null | undefined) => {
    if (!selectedFile) return;

    const { size, type } = selectedFile;

    /**
     * CHECK SIZE
     */
    if (size / 1000000 > MAXIMUM_FILE) {
      return toastError({
        msg: `Kích thước tối đa của ảnh là ${MAXIMUM_FILE} MB`,
      });
    }

    /**
     * CHECK TYPE
     */
    if (!ACCEPT_TYPES.includes(type)) {
      return toastWarn({
        msg: "Định dạng không hợp lệ. Chỉ chấp nhận JPG, JPEG, PNG",
      });
    }

    /**
     * SET FILE
     */
    setFile(selectedFile);
  };

  /* =========================
     DRAG EVENTS
  ========================= */

  const handleDragEnter = (e: React.DragEvent<HTMLLabelElement>): void => {
    e.preventDefault();

    if (disabled) return;

    setDragging(true);
  };

  const handleDragLeave = (): void => {
    setDragging(false);
  };

  const handleDrop = (e: React.DragEvent<HTMLLabelElement>): void => {
    e.preventDefault();

    if (disabled) return;

    setDragging(false);

    const droppedFile = e.dataTransfer.files?.[0];

    validateFile(droppedFile);
  };

  /* =========================
     SELECT FILE
  ========================= */

  const handleSelectImage = (e: React.ChangeEvent<HTMLInputElement>): void => {
    if (disabled) return;

    const selectedFile = e.target.files?.[0];

    validateFile(selectedFile);
  };

  /* =========================
     REMOVE IMAGE
  ========================= */

  const handleRemoveImage = (): void => {
    setFile(null);

    resetPath?.();
  };

  /* =========================
     IMAGE SOURCE
  ========================= */

  const imageSrc = imagePreview || path || "";

  /* =========================
     UI
  ========================= */

  return (
    <div className="w-full">
      {/* LABEL */}
      {label && (
        <div className="mb-2">
          {typeof label === "string" ? (
            <p className="text-sm font-medium text-gray-700">{label}</p>
          ) : (
            label
          )}
        </div>
      )}

      {/* PREVIEW */}
      {imageSrc ? (
        <div
          className={clsx(
            "relative overflow-hidden rounded-2xl border border-dashed border-blue-300 bg-blue-50/20",
            "h-[240px]",
            isWidthFull ? "w-full" : "w-[600px]",
          )}
        >
          <Image
            src={imageSrc}
            alt="Preview image"
            fill
            className="object-cover"
            sizes="100vw"
          />

          {/* REMOVE BUTTON */}
          {!disabled && (
            <button
              type="button"
              onClick={handleRemoveImage}
              className="absolute right-3 top-3 z-10 flex h-9 w-9 items-center justify-center rounded-full bg-white shadow-md transition hover:bg-gray-100 active:scale-95"
            >
              <X size={18} className="text-gray-700" />
            </button>
          )}
        </div>
      ) : (
        <label
          htmlFor={`upload-image-${name}`}
          onDragEnter={handleDragEnter}
          onDragLeave={handleDragLeave}
          onDragOver={(e) => e.preventDefault()}
          onDrop={handleDrop}
          className={clsx(
            "flex h-[240px] flex-col items-center justify-center gap-4 rounded-2xl border border-dashed transition",
            isWidthFull ? "w-full" : "w-[600px]",

            disabled ? "cursor-not-allowed opacity-60" : "cursor-pointer",

            dragging
              ? "border-blue-500 bg-white"
              : "border-blue-300 bg-blue-50/20",
          )}
        >
          {/* ICON */}
          <div className="flex h-16 w-16 items-center justify-center rounded-full bg-white shadow-sm">
            <UploadCloud className="h-8 w-8 text-blue-500" />
          </div>

          {/* TEXT */}
          <div className="space-y-1 text-center">
            <p className="text-sm font-medium text-gray-800">
              Kéo & thả ảnh vào đây
            </p>

            <p className="text-xs text-gray-500">
              Hỗ trợ JPG, JPEG, PNG (Tối đa {MAXIMUM_FILE}MB)
            </p>
          </div>

          {/* INPUT */}
          <input
            hidden
            id={`upload-image-${name}`}
            type="file"
            accept="image/png,image/jpeg,image/jpg"
            disabled={disabled}
            onChange={handleSelectImage}
            onClick={(e) => {
              (e.target as HTMLInputElement).value = "";
            }}
          />
        </label>
      )}
    </div>
  );
};

export default UploadImage;