"use client";

import { useState, useEffect } from "react";
import { Upload, Plus, Settings } from "lucide-react";
import Image from "next/image";
import { Input } from "@/components/ui/input";
import { Label } from "@/components/ui/label";
import { Button } from "@/components/ui/button";
import { Card, CardHeader, CardContent, CardTitle } from "@/components/ui/card";
import {
  Dialog,
  DialogContent,
  DialogFooter,
  DialogHeader,
  DialogTitle,
} from "@/components/ui/dialog";
import { useParams } from "next/navigation";
import { getProductDataById, updateProduct } from "@/service/product";
import { useRouter } from "next/navigation";
import { success, error, close, loading } from "@/config/swal";

export default function UpdateProductForm() {
  const params = useParams();
  const id = params?.id;
  const router = useRouter();
  const [specs, setSpecs] = useState<
    { id: number; title: string; images: string[]; files: File[] }[]
  >([]);
  const [specFiles, setSpecFiles] = useState<Map<number, File[]>>(new Map());

  type ColorType = {
    id: number;
    name: string;
    preview: string;
    colorSelected: string | null;
  };

  const [colors, setColors] = useState<ColorType[]>([]);
  const [colorFiles, setColorFiles] = useState<Map<number, File>>(new Map());
  const [thumbnail, setThumbnail] = useState<string>("");
  const [title, setTitle] = useState<string>("");
  const [variant, setVariant] = useState<string>("");
  const [price, setPrice] = useState<string>("");

  const palette = [
    "#1E4E52",
    "#597E8D",
    "#6B6B6B",
    "#BEBEBE",
    "#E2E2E2",
    "#F4F4F4",
    "#FFFFFF",
    "#F9360A",
    "#9A2A00",
    "#7A1400",
    "#4B0200",
    "#B48B84",
    "#FFA598",
  ];

  const handleAddSpec = () => {
    setSpecs((prev) => [
      ...prev,
      {
        id: prev.length + 1,
        title: "",
        images: [],
        files: [],
      },
    ]);
  };

  const handleAddColor = () => {
    setColors((p) => [
      ...p,
      {
        id: p.length + 1,
        name: "",
        preview: "/car-default.png",
        colorSelected: null,
      },
    ]);
  };

  const [isUploadDialogOpen, setIsUploadDialogOpen] = useState(false);
  const [bannerFile, setBannerFile] = useState<File | null>(null);

  const [uploadTarget, setUploadTarget] = useState<{
    type: "spec" | "color" | "banner";
    index?: number;
  } | null>(null);

  const fileInputId = "file-upload-input";

  const handleFileSelected = (e: React.ChangeEvent<HTMLInputElement>) => {
    const input = e.target;
    const file = input.files?.[0];
    if (!file || !uploadTarget) return;

    const previewUrl = URL.createObjectURL(file);

    // ===================== SPEC =====================
    if (uploadTarget.type === "spec") {
      if (uploadTarget.index === undefined) return;

      const index = uploadTarget.index;

      // preview
      setSpecs((prev) => {
        const updated = [...prev];
        updated[index].images = [...updated[index].images, previewUrl];
        return updated;
      });

      // file upload
      setSpecFiles((prev) => {
        const newMap = new Map(prev);
        const files = newMap.get(index) || [];
        newMap.set(index, [...files, file]);
        return newMap;
      });
    }

    // ===================== COLOR =====================
    if (uploadTarget.type === "color") {
      if (uploadTarget.index === undefined) return;

      const index = uploadTarget.index;

      setColors((prev) => {
        const updated = [...prev];
        updated[index].preview = previewUrl;
        return updated;
      });

      setColorFiles((prev) => {
        const newMap = new Map(prev);
        newMap.set(index, file);
        return newMap;
      });
    }

    // ===================== BANNER =====================
    if (uploadTarget.type === "banner") {
      setThumbnail(previewUrl);
      setBannerFile(file);
    }

    input.value = "";
    setIsUploadDialogOpen(false);
  };

  const formatRupiah = (value: string) =>
    "Rp " + Number(value).toLocaleString("id-ID");

  useEffect(() => {
    if (id) {
      initState();
    }
  }, [id]);

  async function initState() {
    if (!id) return;

    try {
      loading();
      const res = await getProductDataById(id);
      const data = res?.data?.data;

      if (!data) {
        error("Produk tidak ditemukan");
        return;
      }
      close();

      // Set form values
      setTitle(data.title || "");
      setVariant(data.variant || "");
      setPrice(formatRupiah(data.price || "0"));
      setThumbnail(data.thumbnail_url || "");

      // Set colors
      if (data.colors?.length) {
        setColors(
          data.colors.map((color: any, index: number) => ({
            id: index + 1,
            name: color.name || "",
            preview: color.image_url || data.thumbnail_url || "",
            colorSelected: color.name || null,
          })),
        );
      } else {
        setColors([]);
      }

      // Set specifications
      if (data.specifications?.length) {
        setSpecs(
          data.specifications.map((spec: any, index: number) => ({
            id: index + 1,
            title: spec.title || "",
            images: spec.image_urls || [],
            files: [],
          })),
        );
      } else {
        setSpecs([]);
      }
    } catch (err) {
      error("Gagal memuat data produk");
      console.error(err);
    }
  }

  const handleSubmit = async () => {
    if (!id) {
      error("ID produk tidak ditemukan");
      return;
    }

    try {
      loading();
      const formData = new FormData();

      formData.append("title", title);
      if (variant) formData.append("variant", variant);
      if (price) {
        const priceValue = price.replace(/\D/g, "");
        formData.append("price", priceValue);
      }

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

      // Color images (only new files if uploaded)
      // Append files in order of color indices
      colors.forEach((_, index) => {
        const file = colorFiles.get(index);
        if (file) {
          formData.append("color_images", file);
        }
      });

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

      // Specifications JSON (include image count for new files only)
      const specificationsPayload = specs.map((s, index) => {
        const newFiles = specFiles.get(index) || [];
        return {
          title: s.title,
          imageCount: newFiles.length, // Only count new files being uploaded
        };
      });
      formData.append("specifications", JSON.stringify(specificationsPayload));

      specs.forEach((_, index) => {
        const files = specFiles.get(index) || [];
        files.forEach((file) => {
          formData.append("specification_images", file);
        });
      });

      await updateProduct(formData, id);
      success("Produk berhasil diperbarui");
      router.push("/admin/product");
    } catch (err) {
      error("Gagal memperbarui produk");
      console.error(err);
    }
  };

  return (
    <>
      <Card className="w-full border-none shadow-md">
        <CardHeader>
          <CardTitle className="text-xl font-bold text-teal-900">
            Edit Produk
          </CardTitle>
        </CardHeader>

        <CardContent className="space-y-8">
          <div className="grid md:grid-cols-3 gap-4">
            <div>
              <Label>Nama Produk *</Label>
              <Input
                value={title}
                onChange={(e) => setTitle(e.target.value)}
                placeholder="Masukkan nama produk"
              />
            </div>

            <div>
              <Label>Tipe Varian *</Label>
              <Input
                value={variant}
                onChange={(e) => setVariant(e.target.value)}
                placeholder="Masukkan varian"
              />
            </div>

            <div>
              <Label>Harga Produk *</Label>
              <Input
                value={price}
                onChange={(e) => {
                  const rawValue = e.target.value.replace(/\D/g, "");
                  setPrice(formatRupiah(rawValue));
                }}
                placeholder="Masukkan harga"
              />
            </div>
          </div>

          <div>
            <Label className="font-semibold">Thumbnail Produk</Label>
            <div className="mt-2 flex items-center gap-4">
              <div className="w-[120px] h-[80px] rounded-lg overflow-hidden border bg-gray-100">
                {thumbnail ? (
                  <Image
                    src={thumbnail}
                    alt="Thumbnail"
                    width={120}
                    height={80}
                    className="object-cover"
                  />
                ) : (
                  <div className="flex items-center justify-center text-xs text-gray-400 h-full">
                    No Image
                  </div>
                )}
              </div>

              <Button
                type="button"
                className="bg-teal-800 hover:bg-teal-900 text-white"
                onClick={() => {
                  setUploadTarget({ type: "banner" });
                  setIsUploadDialogOpen(true);
                }}
              >
                Upload Banner Baru
              </Button>
            </div>
          </div>

          <div>
            <Label className="font-semibold">Warna Produk *</Label>

            {colors.map((item, index) => (
              <div
                key={item.id}
                className="mt-6 pb-6 border-2 rounded-lg border-black p-3"
              >
                <Label>Pilih Warna {index + 1}</Label>
                <Input
                  placeholder="Contoh: Silver / #E2E2E2"
                  className="mt-1"
                  value={item.name}
                  onChange={(e) => {
                    setColors((prev) => {
                      const updated = [...prev];
                      updated[index].name = e.target.value;
                      updated[index].colorSelected = e.target.value;
                      return updated;
                    });
                  }}
                />

                <div className="flex items-center gap-2 mt-3">
                  <div className="w-10 h-10 rounded-full flex items-center justify-center bg-teal-900">
                    <Settings className="w-5 h-5 text-white" />
                  </div>

                  {palette.map((colorCode) => (
                    <button
                      key={colorCode}
                      type="button"
                      style={{ backgroundColor: colorCode }}
                      className={`w-10 h-10 rounded-full border-2 transition ${
                        item.colorSelected === colorCode
                          ? "border-teal-700 scale-110"
                          : "border-gray-300"
                      }`}
                      onClick={() => {
                        setColors((prev) => {
                          const updated = [...prev];
                          updated[index].colorSelected = colorCode;
                          updated[index].name = colorCode; // ✅ sinkron ke input
                          return updated;
                        });
                      }}
                    />
                  ))}
                </div>

                <div className="mt-4">
                  <Label className="font-semibold">
                    Foto Produk Warna {index + 1}
                  </Label>

                  <div className="flex items-center gap-4 mt-2">
                    <Image
                      src={item.preview}
                      alt="car color"
                      width={120}
                      height={80}
                      className="object-cover rounded-md border"
                    />

                    <Button
                      className="bg-teal-800 hover:bg-teal-900 text-white"
                      onClick={() => {
                        setUploadTarget({ type: "color", index });
                        setIsUploadDialogOpen(true);
                      }}
                    >
                      Upload File Baru
                    </Button>
                  </div>
                </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-10">
            <Label className="text-lg font-semibold text-teal-900">
              Spesifikasi Produk <span className="text-red-500">*</span>
            </Label>

            {specs.map((spec, index) => (
              <div key={spec.id} className="mt-6">
                <Label className="font-semibold text-sm">
                  Judul Spesifikasi {index + 1}
                </Label>
                <Input
                  value={spec.title}
                  placeholder="Masukkan Judul Spesifikasi"
                  className="mt-1"
                  onChange={(e) => {
                    setSpecs((prev) => {
                      const updated = [...prev];
                      updated[index].title = e.target.value;
                      return updated;
                    });
                  }}
                />

                <Label className="font-semibold text-sm 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"
                      />

                      {/* 🔴 TOMBOL HAPUS GAMBAR */}
                      <button
                        type="button"
                        onClick={() => {
                          // hapus preview
                          setSpecs((prev) => {
                            const updated = [...prev];
                            updated[index].images.splice(i, 1);
                            return updated;
                          });

                          // hapus file baru (jika ada)
                          setSpecFiles((prev) => {
                            const map = new Map(prev);
                            const files = map.get(index) || [];
                            files.splice(i, 1);
                            map.set(index, files);
                            return map;
                          });
                        }}
                        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
                    className="bg-teal-800 hover:bg-teal-900 text-white"
                    onClick={() => {
                      setUploadTarget({ type: "spec", index });
                      setIsUploadDialogOpen(true);
                    }}
                  >
                    Upload File Baru
                  </Button>
                </div>

                <div className="my-6 border-b"></div>
              </div>
            ))}

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

          <Button
            onClick={handleSubmit}
            className=" bg-teal-800 hover:bg-teal-900 text-white py-3"
          >
            Submit
          </Button>
        </CardContent>
      </Card>

      <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 cursor-pointer"
            onClick={() => document.getElementById(fileInputId)?.click()}
          >
            <Upload className="w-10 h-10 text-gray-400 mx-auto mb-3" />
            <p className="text-sm text-gray-500">
              Klik untuk upload atau drag & drop
            </p>
            <p className="text-xs text-gray-400">PNG, JPG (max 2 MB)</p>

            <input
              id={fileInputId}
              type="file"
              accept="image/*"
              className="hidden"
              onChange={handleFileSelected}
            />
          </div>

          <DialogFooter className="flex gap-3 pt-4">
            <Button
              variant="secondary"
              className="bg-slate-200"
              onClick={() => setIsUploadDialogOpen(false)}
            >
              Batal
            </Button>

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