"use client";

import { useCallback, useEffect, useState } from "react";
import Cropper, { type Area } from "react-easy-crop";
import { getCroppedImageFile } from "@/lib/cropImage";
import styles from "./ImageCropDialog.module.css";

const MIN_ZOOM = 0.2;
const MAX_ZOOM = 3;
const ZOOM_STEP = 0.05;

type Props = {
  open: boolean;
  imageSrc: string | null;
  title: string;
  aspect: number;
  /** Prefer PNG for logos with transparency */
  outputType?: "image/jpeg" | "image/png";
  fileName?: string;
  onCancel: () => void;
  onComplete: (file: File, previewUrl: string) => void;
};

export default function ImageCropDialog({
  open,
  imageSrc,
  title,
  aspect,
  outputType = "image/jpeg",
  fileName = "image",
  onCancel,
  onComplete,
}: Props) {
  const [crop, setCrop] = useState({ x: 0, y: 0 });
  const [zoom, setZoom] = useState(1);
  const [croppedAreaPixels, setCroppedAreaPixels] = useState<Area | null>(null);
  const [busy, setBusy] = useState(false);
  const [error, setError] = useState("");

  const transparentOutput = outputType === "image/png";

  useEffect(() => {
    if (!open) return;
    setCrop({ x: 0, y: 0 });
    setZoom(1);
    setCroppedAreaPixels(null);
    setBusy(false);
    setError("");
  }, [open, imageSrc]);

  const onCropComplete = useCallback((_: Area, pixels: Area) => {
    setCroppedAreaPixels(pixels);
  }, []);

  function clampZoom(value: number) {
    return Math.min(MAX_ZOOM, Math.max(MIN_ZOOM, Number(value.toFixed(2))));
  }

  if (!open || !imageSrc) return null;

  async function apply() {
    if (!croppedAreaPixels || !imageSrc) return;
    setBusy(true);
    setError("");
    try {
      const file = await getCroppedImageFile(
        imageSrc,
        croppedAreaPixels,
        fileName,
        outputType,
      );
      const previewUrl = URL.createObjectURL(file);
      onComplete(file, previewUrl);
      setCrop({ x: 0, y: 0 });
      setZoom(1);
    } catch (err) {
      setError(err instanceof Error ? err.message : "Could not crop image.");
    } finally {
      setBusy(false);
    }
  }

  return (
    <div className={styles.overlay} role="dialog" aria-modal aria-label={title}>
      <div className={styles.dialog}>
        <div className={styles.head}>
          <h2 className={styles.title}>{title}</h2>
          <p className={styles.hint}>
            Drag to move · zoom out to add padding around the image
          </p>
        </div>

        <div
          className={
            transparentOutput
              ? `${styles.stage} ${styles.stageLight}`
              : styles.stage
          }
        >
          <Cropper
            image={imageSrc}
            crop={crop}
            zoom={zoom}
            minZoom={MIN_ZOOM}
            maxZoom={MAX_ZOOM}
            aspect={aspect}
            onCropChange={setCrop}
            onZoomChange={(value) => setZoom(clampZoom(value))}
            onCropComplete={onCropComplete}
            showGrid={false}
            objectFit="contain"
            restrictPosition={false}
            style={{
              containerStyle: {
                background: "transparent",
              },
            }}
          />
        </div>

        <div className={styles.zoomRow}>
          <button
            type="button"
            className={styles.zoomBtn}
            disabled={busy || zoom <= MIN_ZOOM}
            aria-label="Zoom out"
            onClick={() => setZoom((value) => clampZoom(value - ZOOM_STEP))}
          >
            −
          </button>
          <input
            className={styles.zoomRange}
            type="range"
            min={MIN_ZOOM}
            max={MAX_ZOOM}
            step={0.01}
            value={zoom}
            disabled={busy}
            aria-label="Zoom"
            onChange={(event) => setZoom(clampZoom(Number(event.target.value)))}
          />
          <button
            type="button"
            className={styles.zoomBtn}
            disabled={busy || zoom >= MAX_ZOOM}
            aria-label="Zoom in"
            onClick={() => setZoom((value) => clampZoom(value + ZOOM_STEP))}
          >
            +
          </button>
          <span className={styles.zoomValue}>{Math.round(zoom * 100)}%</span>
        </div>

        {error ? (
          <p className={styles.error} role="alert">
            {error}
          </p>
        ) : null}

        <div className={styles.actions}>
          <button
            type="button"
            className={`outline-btn ${styles.cancelBtn}`}
            disabled={busy}
            onClick={() => {
              setCrop({ x: 0, y: 0 });
              setZoom(1);
              setError("");
              onCancel();
            }}
          >
            Cancel
          </button>
          <button
            type="button"
            className={`outline-btn ${styles.applyBtn}`}
            disabled={busy || !croppedAreaPixels}
            onClick={() => void apply()}
          >
            {busy ? "Applying…" : "Apply crop"}
          </button>
        </div>
      </div>
    </div>
  );
}