"use client";

import { Icon } from "@/components/icons";
import { FileField } from "@/components/qr-forms/file-field";
import type { QrFormProps } from "@/components/qr-forms/types";
import { Field, TextArea, TextInput } from "@/components/ui";
import { MAX_IMAGES, type ImageEntry } from "@/lib/qr/types/image";
import { formatBytes } from "@/lib/uploads.shared";

function readImages(value: unknown): ImageEntry[] {
  if (!Array.isArray(value)) return [];
  return value.flatMap((entry) => {
    const record = (entry ?? {}) as Record<string, unknown>;
    if (typeof record.fileId !== "string" || record.fileId.length === 0) {
      return [];
    }
    return [
      {
        fileId: record.fileId,
        filename: typeof record.filename === "string" ? record.filename : "bild",
        size: typeof record.size === "number" ? record.size : 0,
        caption: typeof record.caption === "string" ? record.caption : "",
      },
    ];
  });
}

export function ImageForm({ value, onChange, error, disabled }: QrFormProps) {
  const title = typeof value.title === "string" ? value.title : "";
  const description =
    typeof value.description === "string" ? value.description : "";
  const images = readImages(value.images);

  const setImages = (next: ImageEntry[]) => onChange({ ...value, images: next });

  const move = (index: number, direction: -1 | 1) => {
    const target = index + direction;
    if (target < 0 || target >= images.length) return;
    const next = [...images];
    [next[index], next[target]] = [next[target], next[index]];
    setImages(next);
  };

  return (
    <div className="space-y-5">
      <div>
        <div className="mb-2 flex items-baseline justify-between gap-3">
          <span className="text-sm font-medium text-slate-700">Bilder</span>
          <span className="text-xs text-slate-500">
            {images.length} von {MAX_IMAGES}
          </span>
        </div>

        {images.length > 0 ? (
          <ul className="mb-3 space-y-3">
            {images.map((image, index) => (
              <li
                key={image.fileId}
                className="rounded-xl border border-slate-200 bg-slate-50/70 p-3"
              >
                <div className="flex items-start gap-3">
                  {/* eslint-disable-next-line @next/next/no-img-element -- eigene
                      Auslieferung, unbekannte Maße */}
                  <img
                    src={`/api/uploads/${image.fileId}`}
                    alt=""
                    className="size-14 shrink-0 rounded-lg border border-slate-200 bg-surface object-cover"
                  />
                  <div className="min-w-0 flex-1 space-y-2">
                    <p className="truncate text-sm text-slate-600">
                      {image.filename}
                      {image.size > 0 ? ` · ${formatBytes(image.size)}` : ""}
                    </p>
                    <TextInput
                      aria-label={`Bildunterschrift von Bild ${index + 1}`}
                      value={image.caption}
                      disabled={disabled}
                      maxLength={120}
                      placeholder="Bildunterschrift (optional)"
                      onChange={(event) =>
                        setImages(
                          images.map((entry, i) =>
                            i === index
                              ? { ...entry, caption: event.target.value }
                              : entry,
                          ),
                        )
                      }
                    />
                  </div>

                  <div className="flex shrink-0 flex-col gap-0.5">
                    <button
                      type="button"
                      disabled={disabled || index === 0}
                      onClick={() => move(index, -1)}
                      aria-label={`Bild ${index + 1} nach oben`}
                      className="rounded-md p-1.5 text-slate-500 transition-colors hover:bg-surface hover:text-slate-900 disabled:cursor-not-allowed disabled:opacity-30 disabled:hover:bg-transparent"
                    >
                      <Icon name="arrowLeft" className="size-4 rotate-90" />
                    </button>
                    <button
                      type="button"
                      disabled={disabled || index === images.length - 1}
                      onClick={() => move(index, 1)}
                      aria-label={`Bild ${index + 1} nach unten`}
                      className="rounded-md p-1.5 text-slate-500 transition-colors hover:bg-surface hover:text-slate-900 disabled:cursor-not-allowed disabled:opacity-30 disabled:hover:bg-transparent"
                    >
                      <Icon name="arrowLeft" className="size-4 -rotate-90" />
                    </button>
                    <button
                      type="button"
                      disabled={disabled}
                      onClick={() =>
                        setImages(images.filter((_, i) => i !== index))
                      }
                      aria-label={`Bild ${index + 1} entfernen`}
                      className="rounded-md p-1.5 text-slate-500 transition-colors hover:bg-surface hover:text-red-600 disabled:opacity-40"
                    >
                      <Icon name="trash" className="size-4" />
                    </button>
                  </div>
                </div>
              </li>
            ))}
          </ul>
        ) : null}

        {images.length < MAX_IMAGES ? (
          <FileField
            kind="image"
            label={images.length === 0 ? "Bild auswählen" : "Weiteres Bild"}
            disabled={disabled}
            onUploaded={(file) =>
              setImages([
                ...images,
                {
                  fileId: file.fileId,
                  filename: file.filename,
                  size: file.size,
                  caption: "",
                },
              ])
            }
          />
        ) : null}

        {error ? (
          <p role="alert" className="mt-2 text-sm text-red-600">
            {error}
          </p>
        ) : (
          <p className="mt-2 text-sm text-slate-500">
            PNG, JPEG, WebP, GIF oder AVIF. Mehrere Bilder erscheinen
            untereinander als Galerie.
          </p>
        )}
      </div>

      <Field
        label="Titel (optional)"
        htmlFor="image-title"
        hint="Steht über den Bildern."
      >
        <TextInput
          id="image-title"
          value={title}
          disabled={disabled}
          maxLength={80}
          placeholder="Impressionen vom Hoffest"
          onChange={(event) => onChange({ ...value, title: event.target.value })}
        />
      </Field>

      <Field
        label="Kurzer Text (optional)"
        htmlFor="image-description"
        hint="Eine Zeile zur Einordnung."
      >
        <TextArea
          id="image-description"
          rows={2}
          value={description}
          disabled={disabled}
          maxLength={300}
          onChange={(event) =>
            onChange({ ...value, description: event.target.value })
          }
        />
      </Field>
    </div>
  );
}