"use client";

import { useRef, useState } from "react";
import { useForm } from "react-hook-form";
import { zodResolver } from "@hookform/resolvers/zod";
import * as z from "zod";

import { Upload, Plus, UploadCloud } from "lucide-react";
import { Card, CardHeader, CardTitle, CardContent } from "@/components/ui/card";
import { Label } from "@radix-ui/react-dropdown-menu";
import Image from "next/image";
import {
  Dialog,
  DialogContent,
  DialogFooter,
  DialogHeader,
  DialogTitle,
} from "@/components/ui/dialog";

import { Input } from "@/components/ui/input";
import { Button } from "@/components/ui/button";
import { createProduct } from "@/service/product";
import withReactContent from "sweetalert2-react-content";
import Swal from "sweetalert2";
import { useRouter } from "next/navigation";
import { loading } from "@/config/swal";

const formSchema = z.object({
  name: z.string().min(1, "Nama produk wajib diisi"),
  variant: z.string().min(1, "Tipe varian wajib diisi"),
  price: z.coerce.number().min(1, "Harga produk wajib diisi"),
  banner: z.instanceof(FileList).optional(),
});

export default function AddProductForm() {
  const [colors, setColors] = useState<
    { id: number; name: string; file: File | null }[]
  >([{ id: 1, name: "", file: null }]);

  const [selectedColor, setSelectedColor] = useState<string | null>(null);
  const [specs, setSpecs] = useState<
    { id: number; title: string; images: string[]; files: File[] }[]
  >([{ id: 1, title: "", images: [], files: [] }]);

  const [isUploadDialogOpen, setIsUploadDialogOpen] = useState(false);
  const [uploadTarget, setUploadTarget] = useState<{
    type: "spec";
    index: number;
  } | null>(null);

  const fileInputId = "spec-upload-input";
  const fileInputRef = useRef<HTMLInputElement | null>(null);
  const isUploadingRef = useRef(false);

  const [file, setFile] = useState<File | null>(null);
  const router = useRouter();
  const MySwal = withReactContent(Swal);
  const [priceDisplay, setPriceDisplay] = useState("");

  const handleFileChange = (e: any) => {
    const selected = e.target.files[0];
    if (selected) setFile(selected);
  };

  const handleAddSpec = () => {
    setSpecs((prev) => [
      ...prev,
      { id: prev.length + 1, title: "", images: [], files: [] },
    ]);
  };
  const {
    register,
    handleSubmit,
    setValue,
    formState: { errors },
  } = useForm<z.infer<typeof formSchema>>({
    resolver: zodResolver(formSchema),
  });

  const handleSpecTitleChange = (index: number, value: string) => {
    const updated = [...specs];
    updated[index].title = value;
    setSpecs(updated);
  };

  const handleFileSelected = (e: React.ChangeEvent<HTMLInputElement>) => {
    const input = e.target;
    const selectedFile = input.files?.[0];

    if (!selectedFile || !uploadTarget) return;

    // 🔒 CEGAH DOUBLE EVENT
    if (isUploadingRef.current) return;
    isUploadingRef.current = true;

    setSpecs((prev) => {
      const updated = [...prev];
      const spec = updated[uploadTarget.index];

      // max 5 gambar
      if (spec.files.length >= 5) {
        isUploadingRef.current = false;
        return prev;
      }

      // cegah file sama
      if (
        spec.files.some(
          (f) => f.name === selectedFile.name && f.size === selectedFile.size,
        )
      ) {
        isUploadingRef.current = false;
        return prev;
      }

      const previewUrl = URL.createObjectURL(selectedFile);

      spec.images = [...spec.images, previewUrl];
      spec.files = [...spec.files, selectedFile];

      return updated;
    });

    // reset input
    input.value = "";
    setIsUploadDialogOpen(false);

    // release lock
    setTimeout(() => {
      isUploadingRef.current = false;
    }, 0);
  };

  const onSubmit = async (data: z.infer<typeof formSchema>) => {
    try {
      loading();
      const formData = new FormData();

      formData.append("title", data.name);
      formData.append("variant", data.variant);
      formData.append("price", data.price.toString());
      formData.append("status", "1");
      formData.append("is_active", "1");

      // banner
      if (file) {
        formData.append("file", file);
      }

      // 🔥 colors JSON (object)
      const colorsPayload = colors.map((c) => ({
        name: c.name,
      }));
      formData.append("colors", JSON.stringify(colorsPayload));

      // 🔥 color images
      colors.forEach((c) => {
        if (c.file) {
          formData.append("color_images", c.file);
        }
      });

      // 🔥 specifications JSON (include image count for backend processing)
      const specificationsPayload = specs.map((s) => ({
        title: s.title,
        imageCount: s.files.length,
      }));
      formData.append("specifications", JSON.stringify(specificationsPayload));

      // 🔥 specification images (multiple files per spec)
      specs.forEach((s) => {
        s.files.forEach((file) => {
          formData.append("specification_images", file);
        });
      });

      await createProduct(formData);
      successSubmit("/admin/product");
    } catch (err) {
      console.error(err);
      alert("Gagal mengirim produk");
    }
  };

  function successSubmit(redirect: any) {
    MySwal.fire({
      title: "Sukses",
      icon: "success",
      confirmButtonColor: "#3085d6",
      confirmButtonText: "OK",
    }).then((result) => {
      if (result.isConfirmed) {
        router.push(redirect);
      }
    });
  }

  const handlePriceChange = (e: React.ChangeEvent<HTMLInputElement>) => {
    const rawValue = e.target.value.replace(/\D/g, "");
    setPriceDisplay(formatRupiah(rawValue));
    setValue("price", rawValue ? Number(rawValue) : 0);
  };

  const handleAddColor = () => {
    setColors((prev) => [
      ...prev,
      { id: prev.length + 1, name: "", file: null },
    ]);
  };

  const handleColorFileChange = (
    index: number,
    e: React.ChangeEvent<HTMLInputElement>,
  ) => {
    const file = e.target.files?.[0] || null;
    const updated = [...colors];
    updated[index].file = file;
    setColors(updated);
  };

  const formatRupiah = (value: string) => {
    const number = value.replace(/\D/g, "");
    return number ? `Rp ${Number(number).toLocaleString("id-ID")}` : "";
  };

  return (
    <Card className="w-full max-w-full mx-auto shadow-md border-none">
      <CardHeader>
        <CardTitle className="text-xl font-bold text-teal-900">
          Form Tambah Produk Baru
        </CardTitle>
      </CardHeader>
      <CardContent>
        <form onSubmit={handleSubmit(onSubmit)} className="space-y-6">
          <div className="grid md:grid-cols-3 gap-4">
            <div>
              <Label>Nama Produk *</Label>
              <Input placeholder="Masukkan Nama Produk" {...register("name")} />
              {errors.name && (
                <p className="text-sm text-red-500 mt-1">
                  {errors.name.message}
                </p>
              )}
            </div>

            <div>
              <Label>Tipe Varian *</Label>
              <Input
                placeholder="Contoh: AWD, SHS, EV"
                {...register("variant")}
              />
              {errors.variant && (
                <p className="text-sm text-red-500 mt-1">
                  {errors.variant.message}
                </p>
              )}
            </div>

            <div>
              <Label>Harga Produk *</Label>
              <Input
                placeholder="Masukkan Harga Produk"
                value={priceDisplay}
                onChange={handlePriceChange}
              />

              {errors.price && (
                <p className="text-sm text-red-500 mt-1">
                  {errors.price.message}
                </p>
              )}
            </div>
          </div>

          <div>
            <Label className="text-gray-700">
              Upload Banner <span className="text-red-500">*</span>
            </Label>
            <label
              htmlFor="uploadFile"
              className="mt-1 border-2 border-dashed border-gray-300 rounded-xl p-6 flex flex-col items-center justify-center text-gray-500 cursor-pointer hover:border-[#1F6779]/50 transition"
            >
              <UploadCloud className="w-10 h-10 text-[#1F6779] mb-2" />
              <p className="text-sm font-medium">
                Klik untuk upload atau drag & drop
              </p>
              <p className="text-xs text-gray-400 mt-1">PNG, JPG (max 2 MB)</p>
              <input
                id="uploadFile"
                type="file"
                accept="image/png, image/jpeg"
                className="hidden"
                onChange={handleFileChange}
              />
              {file && (
                <p className="mt-2 text-xs text-[#1F6779] font-medium">
                  {file.name}
                </p>
              )}
            </label>
          </div>

          {/* Upload Produk */}
          <div>
            <Label>Upload Produk *</Label>
            {colors.map((color, index) => (
              <div
                key={color.id}
                className="border p-4 rounded-lg mt-4 space-y-4"
              >
                <Label className="text-sm font-semibold">
                  Pilih Warna {index + 1}
                </Label>
                <Input
                  value={color.name}
                  onChange={(e) => {
                    const updated = [...colors];
                    updated[index].name = e.target.value;
                    setColors(updated);
                  }}
                />

                {/* Pilihan Warna */}
                <div className="flex flex-wrap gap-2">
                  {[
                    "#1E4E52",
                    "#597E8D",
                    "#6B6B6B",
                    "#BEBEBE",
                    "#E2E2E2",
                    "#F4F4F4",
                    "#FFFFFF",
                    "#F9360A",
                    "#9A2A00",
                    "#7A1400",
                    "#4B0200",
                    "#B48B84",
                    "#FFA598",
                  ].map((colorCode) => (
                    <button
                      key={colorCode}
                      type="button"
                      onClick={() => {
                        const updated = [...colors];
                        updated[index].name = colorCode; // 🔥 INI KUNCINYA
                        setColors(updated);
                        setSelectedColor(colorCode);
                      }}
                      className={`w-8 h-8 rounded-full border-2 transition ${
                        selectedColor === colorCode
                          ? "border-teal-700 scale-110"
                          : "border-gray-200"
                      }`}
                      style={{ backgroundColor: colorCode }}
                    />
                  ))}
                </div>

                {/* Upload Foto Warna */}
                <div>
                  <label
                    htmlFor={`color-file-${index}`}
                    className="border-2 border-dashed rounded-lg flex flex-col items-center justify-center py-6 cursor-pointer hover:bg-gray-50 transition"
                  >
                    <Upload className="w-6 h-6 text-gray-400 mb-2" />
                    <p className="text-sm text-gray-500 text-center">
                      Klik untuk upload foto mobil warna ini
                    </p>
                    <p className="text-xs text-gray-400">PNG, JPG (max 5 MB)</p>

                    <input
                      id={`color-file-${index}`}
                      type="file"
                      accept="image/png,image/jpeg"
                      className="hidden"
                      onChange={(e) => handleColorFileChange(index, e)}
                    />
                  </label>
                  {color.file && (
                    <p className="text-xs text-teal-700 mt-2">
                      {color.file.name}
                    </p>
                  )}
                </div>
              </div>
            ))}

            <Button
              type="button"
              onClick={handleAddColor}
              className="w-full bg-teal-800 hover:bg-teal-900 text-white mt-4"
            >
              <Plus className="w-4 h-4 mr-2" /> Tambah Warna Baru
            </Button>
          </div>

          <div className="mt-8">
            <Label className="font-semibold text-lg text-teal-900">
              Spesifikasi Produk <span className="text-red-500">*</span>
            </Label>

            {specs.map((spec, index) => (
              <div
                key={spec.id}
                className="mt-6 border-2 rounded-lg border-black p-3"
              >
                <Label className="text-sm font-semibold">
                  Judul Spesifikasi {index + 1}
                </Label>
                <Input
                  placeholder="Contoh: Mesin Turbo 1.6L"
                  className="mt-1"
                  value={spec.title}
                  onChange={(e) => handleSpecTitleChange(index, e.target.value)}
                />

                <Label className="text-sm font-semibold mt-4 block">
                  Foto Spesifikasi {index + 1}
                </Label>

                <div className="flex flex-wrap gap-4 mt-2">
                  {spec.images.map((img, i) => (
                    <div key={i} className="relative">
                      <Image
                        src={img}
                        width={120}
                        height={120}
                        alt="spec"
                        className="rounded-lg border object-cover"
                      />
                      <button
                        type="button"
                        onClick={() => {
                          setSpecs((prev) => {
                            const updated = [...prev];
                            updated[index].images.splice(i, 1);
                            updated[index].files.splice(i, 1);
                            return updated;
                          });
                        }}
                        className="absolute -top-2 -right-2 bg-red-500 text-white rounded-full w-6 h-6 flex items-center justify-center text-xs hover:bg-red-600"
                      >
                        ×
                      </button>
                    </div>
                  ))}

                  <Button
                    type="button"
                    className="bg-teal-800 hover:bg-teal-900 text-white"
                    onClick={() => {
                      setUploadTarget({ type: "spec", index });
                      setIsUploadDialogOpen(true);
                    }}
                  >
                    <Plus className="w-4 h-4 mr-2" />
                    Tambah Foto
                  </Button>
                </div>

                <div className="my-4 border-b"></div>
              </div>
            ))}

            <Button
              type="button"
              onClick={handleAddSpec}
              className="w-full bg-teal-800 hover:bg-teal-900 text-white py-3 rounded-lg mt-6 flex items-center justify-center gap-2"
            >
              <Plus className="w-4 h-4" />
              Tambahkan Spesifikasi Baru
            </Button>
          </div>

          <Button
            type="submit"
            className=" bg-teal-800 hover:bg-teal-900 text-white mt-6"
          >
            Submit
          </Button>
        </form>
      </CardContent>

      <Dialog open={isUploadDialogOpen} onOpenChange={setIsUploadDialogOpen}>
        <DialogContent className="max-w-md">
          <DialogHeader>
            <DialogTitle className="text-teal-900 font-semibold">
              Upload File
            </DialogTitle>
          </DialogHeader>

          <div className="border-2 border-dashed rounded-xl p-8 text-center">
            <Upload className="w-10 h-10 text-gray-400 mx-auto mb-3" />
            <p className="text-sm text-gray-500">
              Klik tombol di bawah untuk memilih file
            </p>
            <p className="text-xs text-gray-400">PNG, JPG (max 2 MB)</p>
          </div>

          <input
            ref={fileInputRef}
            type="file"
            accept="image/*"
            className="hidden"
            onChange={handleFileSelected}
          />

          <DialogFooter className="flex gap-3 pt-4">
            <Button
              variant="secondary"
              onClick={() => setIsUploadDialogOpen(false)}
            >
              Batal
            </Button>

            <Button
              onClick={() => fileInputRef.current?.click()}
              className="bg-teal-800 hover:bg-teal-900 text-white"
            >
              Pilih File
            </Button>
          </DialogFooter>
        </DialogContent>
      </Dialog>
    </Card>
  );
}