"use client";

import { useCallback, useEffect, useRef, useState, type CSSProperties } from "react";
import Cropper, { type Area } from "react-easy-crop";
import "react-easy-crop/react-easy-crop.css";
import {
  UploadCloud, ZoomIn, Check, Loader2, Images, RotateCcw, Crop,
} from "lucide-react";
import {
  apiMyMedia, apiUploadBrand,
  type MediaAttachment,
} from "@/lib/api";
import { getCroppedBrandWebp, getFullBrandWebp } from "@/lib/cropImage";
import Modal from "@/components/Modal";
import BrandLockup from "@/components/BrandLockup";
import { AdminSegmented } from "@/components/admin";
import {
  BRAND_LOGO_FITS,
  BRAND_LOGO_SIZES,
  BRAND_LOGO_SIZE_ASPECT,
  brandFileOk,
  brandLogoBox,
  suggestLogoSize,
  type BrandLogoFit,
  type BrandLogoSize,
  type BrandSlot,
} from "@/lib/brand";

// 源文件大小保护（防止手机相册原图撑爆浏览器内存；最终限制以裁剪后 2MB 为准）
const SOURCE_MAX_BYTES = 15 * 1024 * 1024;

interface BrandCropModalProps {
  open: boolean;
  slot: BrandSlot;
  onClose: () => void;
  /** 裁剪完成后返回新 URL */
  onCropped: (url: string) => void;
  /** 外部传入的文件：打开后直接进入裁剪 */
  seedFile?: File | null;
  /** 外部传入的 URL（如媒体库图片）：打开后直接进入裁剪 */
  seedUrl?: string;
  /** 已消费 seedFile / seedUrl */
  onSeedConsumed?: () => void;
  /** 当前显示画幅（与工具栏同源，受控） */
  logoSize?: BrandLogoSize;
  /** 当前铺法（与工具栏同源，受控） */
  logoFit?: BrandLogoFit;
  /** 画幅变更回调（同步到父组件工具栏） */
  onSizeChange?: (size: BrandLogoSize) => void;
  /** 铺法变更回调（同步到父组件工具栏） */
  onFitChange?: (fit: BrandLogoFit) => void;
}

export default function BrandCropModal({
  open, slot, onClose, onCropped, seedFile, seedUrl, onSeedConsumed,
  logoSize = "sq", logoFit = "contain", onSizeChange, onFitChange,
}: BrandCropModalProps) {
  const [media, setMedia] = useState<MediaAttachment[]>([]);
  const [imageSrc, setImageSrc] = useState<string | null>(null);
  const [srcIsBlob, setSrcIsBlob] = useState(false);
  const [crop, setCrop] = useState({ x: 0, y: 0 });
  const [zoom, setZoom] = useState(1);
  const [pixelCrop, setPixelCrop] = useState<Area | null>(null);
  const [busy, setBusy] = useState(false);
  const [error, setError] = useState("");
  const [dragOver, setDragOver] = useState(false);
  const fileInputRef = useRef<HTMLInputElement>(null);
  // 已识别过比例的图片（每张图进入裁剪时只自动推荐一次画幅）
  const detectedSrcRef = useRef<string | null>(null);

  // Favicon 固定方形，不参与画幅/铺法；auto=原图比例自由裁剪
  const isFavicon = slot === "favicon";
  const effectiveSize: BrandLogoSize = isFavicon ? "sq" : logoSize;
  const isAuto = effectiveSize === "auto";
  const cropAspect: number | undefined = isFavicon ? 1 : BRAND_LOGO_SIZE_ASPECT[effectiveSize];

  // 打开时拉取媒体库
  useEffect(() => {
    if (!open) return;
    setError("");
    apiMyMedia()
      .then((res) => setMedia(res.attachments || []))
      .catch(() => setMedia([]));
  }, [open]);

  // 图片进入裁剪后，按原始比例自动推荐画幅（差距大→原图自适应），每张图仅一次
  useEffect(() => {
    if (!imageSrc || isFavicon || detectedSrcRef.current === imageSrc) return;
    detectedSrcRef.current = imageSrc;
    const img = new Image();
    img.onload = () => {
      onSizeChange?.(suggestLogoSize(img.naturalWidth, img.naturalHeight));
    };
    img.src = imageSrc;
  }, [imageSrc, isFavicon, onSizeChange]);

  // 画幅变化时重置构图位置（换画幅=重新构图；缩放保留）
  useEffect(() => {
    if (!open) return;
    setCrop({ x: 0, y: 0 });
  }, [effectiveSize, open]);

  // 关闭时复位并释放本地 blob URL
  useEffect(() => {
    if (!open) {
      setImageSrc((prev) => {
        if (prev && prev.startsWith("blob:")) URL.revokeObjectURL(prev);
        return null;
      });
      setSrcIsBlob(false);
      setCrop({ x: 0, y: 0 });
      setZoom(1);
      setPixelCrop(null);
      setError("");
      setBusy(false);
      setDragOver(false);
      detectedSrcRef.current = null;
    }
  }, [open, slot]);

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

  const enterCrop = useCallback((src: string, isBlob: boolean) => {
    setError("");
    setImageSrc((prev) => {
      if (prev && prev.startsWith("blob:")) URL.revokeObjectURL(prev);
      return src;
    });
    setSrcIsBlob(isBlob);
    setCrop({ x: 0, y: 0 });
    setZoom(1);
  }, []);

  /** 校验并进入裁剪；返回错误文案，成功返回空串 */
  const acceptImageFile = useCallback((file: File): string => {
    const err = brandFileOk(slot, file);
    if (err) return err;
    if (file.size > SOURCE_MAX_BYTES) {
      return "原图不能超过 15MB，裁剪后的品牌图需在 2MB 以内";
    }
    enterCrop(URL.createObjectURL(file), true);
    return "";
  }, [enterCrop, slot]);

  // 外部传入：弹窗打开后立刻进入裁剪
  useEffect(() => {
    if (!open) return;
    if (seedFile) {
      const errMsg = acceptImageFile(seedFile);
      if (errMsg) setError(errMsg);
      onSeedConsumed?.();
      return;
    }
    if (seedUrl) {
      enterCrop(seedUrl, false);
      onSeedConsumed?.();
    }
  }, [open, seedFile, seedUrl, acceptImageFile, enterCrop, onSeedConsumed]);

  /**
   * 点击媒体库图片：直接进入裁剪界面
   * 品牌图不做"直接选用"，统一走裁剪后上传，保证比例一致
   */
  const handlePick = (item: MediaAttachment) => {
    if (busy) return;
    enterCrop(item.url, false);
  };

  const onFileChange = (e: React.ChangeEvent<HTMLInputElement>) => {
    const file = e.target.files?.[0];
    e.target.value = "";
    if (!file) return;
    const errMsg = acceptImageFile(file);
    if (errMsg) setError(errMsg);
  };

  const onDropZoneDragOver = (e: React.DragEvent) => {
    e.preventDefault();
    e.stopPropagation();
    if (!busy) setDragOver(true);
  };

  const onDropZoneDragLeave = (e: React.DragEvent) => {
    e.preventDefault();
    e.stopPropagation();
    setDragOver(false);
  };

  const onDropZoneDrop = (e: React.DragEvent) => {
    e.preventDefault();
    e.stopPropagation();
    setDragOver(false);
    if (busy) return;
    const file = e.dataTransfer.files?.[0];
    if (!file) return;
    const errMsg = acceptImageFile(file);
    if (errMsg) setError(errMsg);
  };

  const backToLibrary = () => {
    if (imageSrc && srcIsBlob) URL.revokeObjectURL(imageSrc);
    setImageSrc(null);
    setSrcIsBlob(false);
    setError("");
  };

  const confirmUpload = async () => {
    if (!imageSrc || busy) return;
    if (!isAuto && !pixelCrop) return;
    setBusy(true);
    setError("");
    try {
      // 原图模式：整图直传不裁剪；固定画幅：按裁剪区域导出
      const blob = isAuto
        ? await getFullBrandWebp(imageSrc)
        : await getCroppedBrandWebp(imageSrc, pixelCrop!, cropAspect!);
      const file = new File([blob], "brand.webp", { type: "image/webp" });
      const url = await apiUploadBrand(slot, file);
      onCropped(url);
      onClose();
    } catch (err) {
      setError(err instanceof Error ? err.message : "上传失败，请重试");
    } finally {
      setBusy(false);
    }
  };

  const slotLabel = slot === "logo_light" ? "浅色 Logo" : slot === "logo_dark" ? "深色 Logo" : "Favicon";
  // 裁剪区底色与槽位主题相反：浅色主题 Logo（通常为深色图）用浅底，深色主题 Logo 用深底
  const cropBg = slot === "logo_dark" ? "#0c0d12" : "#f2f3f5";

  return (
    <Modal
      open={open}
      title={imageSrc ? `裁剪${slotLabel}` : `上传${slotLabel}`}
      onClose={onClose}
      busy={busy}
      dismissOnOverlay={!busy}
      maxWidthClass="max-w-[440px]"
      panelClassName="p-5"
      ariaLabel={`上传${slotLabel}`}
    >
      {error && <div className="alert-error mb-4">{error}</div>}

      {!imageSrc ? (
        <>
          {/* 选择新图片：点击或拖放 */}
          <button
            type="button"
            onClick={() => fileInputRef.current?.click()}
            onDragOver={onDropZoneDragOver}
            onDragLeave={onDropZoneDragLeave}
            onDrop={onDropZoneDrop}
            className="w-full flex flex-col items-center justify-center gap-2 rounded-xl py-7 px-4 text-center transition-colors hover:border-[var(--accent)]"
            style={{
              border: `1.5px dashed ${dragOver ? "var(--accent)" : "var(--line-2)"}`,
              background: dragOver
                ? "color-mix(in srgb, var(--accent) 10%, var(--panel-2))"
                : "var(--panel-2)",
              color: "var(--ink-2)",
            }}
          >
            <span
              className="inline-flex w-11 h-11 items-center justify-center rounded-full"
              style={{ background: "var(--accent-soft)", color: "var(--accent)" }}
            >
              <UploadCloud size={20} />
            </span>
            <span className="text-[13.5px] font-bold" style={{ color: "var(--ink)" }}>
              {dragOver ? "松开即可开始裁剪" : "点击选择或拖放图片"}
            </span>
            <span className="text-[12px] leading-relaxed" style={{ color: "var(--ink-3)" }}>
              支持 PNG / WebP / SVG{slot === "favicon" ? " / ICO" : ""}，裁剪后统一转为 WebP，大小不超过 2MB
            </span>
          </button>
          <input
            ref={fileInputRef}
            type="file"
            accept={slot === "favicon" ? "image/png,image/webp,image/svg+xml,.ico,image/x-icon" : "image/png,image/webp,image/svg+xml"}
            className="hidden"
            onChange={onFileChange}
          />

          {/* 媒体库 */}
          {media.length > 0 && (
            <div className="mt-5">
              <p
                className="flex items-center gap-1.5 text-[12px] font-bold tracking-[0.04em] mb-2.5"
                style={{ color: "var(--ink-3)" }}
              >
                <Images size={13} /> 我的图片（点击后进入裁剪）
              </p>
              <div className="grid grid-cols-6 gap-2">
                {media.map((item) => (
                  <button
                    key={item.id}
                    type="button"
                    onClick={() => handlePick(item)}
                    disabled={busy}
                    className="relative group aspect-square rounded-lg overflow-hidden transition-transform hover:scale-105 disabled:cursor-default"
                    style={{ boxShadow: "0 0 0 1px var(--line)" }}
                    data-tip="裁剪后设为品牌图"
                  >
                    {/* eslint-disable-next-line @next/next/no-img-element */}
                    <img
                      src={item.url}
                      alt="媒体库图片"
                      className="w-full h-full object-cover"
                      loading="lazy"
                    />
                    <span
                      className="pointer-events-none absolute inset-0 flex items-center justify-center opacity-0 group-hover:opacity-100 transition-opacity"
                      style={{ background: "color-mix(in srgb, var(--ink) 45%, transparent)", color: "#fff" }}
                    >
                      <Crop size={13} />
                    </span>
                  </button>
                ))}
              </div>
            </div>
          )}
        </>
      ) : (
        <>
          {/* 画幅：唯一的比例控件（同时决定裁剪比例与页眉图框）；favicon 固定方形不展示 */}
          {!isFavicon && (
            <div className="mb-3">
              <div className="flex items-center gap-1.5 mb-1.5">
                <span className="text-[12px] font-semibold" style={{ color: "var(--ink-3)" }}>画幅</span>
                <span className="text-[11px]" style={{ color: "var(--ink-3)" }}>已按图片比例推荐，可手动调整</span>
              </div>
              <div className="admin-brand-size-row" role="group" aria-label="显示画幅">
                {BRAND_LOGO_SIZES.map((item) => {
                  const on = effectiveSize === item.id;
                  return (
                    <button
                      key={item.id}
                      type="button"
                      className={`admin-brand-size-chip${on ? " is-on" : ""}`}
                      onClick={() => onSizeChange?.(item.id)}
                    >
                      <span className="admin-brand-size-chip-label">{item.label}</span>
                      <span className="admin-brand-size-chip-px">
                        {item.w ? `${item.w}×${item.h}` : "自适应"}
                      </span>
                    </button>
                  );
                })}
              </div>
            </div>
          )}

          {/* 原图模式：整图直传，不裁剪；固定画幅：裁剪 */}
          {isAuto ? (
            <div
              className="relative w-full h-72 rounded-xl overflow-hidden flex items-center justify-center p-4"
              style={{ background: cropBg }}
            >
              {/* eslint-disable-next-line @next/next/no-img-element */}
              <img
                src={imageSrc || ""}
                alt="整图预览"
                className="max-w-full max-h-full object-contain"
                style={{ borderRadius: 6 }}
              />
              <span
                className="absolute left-2.5 top-2.5 text-[11px] px-1.5 py-0.5 rounded"
                style={{
                  background: "rgba(0,0,0,.45)",
                  color: "#fff",
                }}
              >
                整图使用，不裁剪
              </span>
            </div>
          ) : (
            <>
              <div
                className="relative w-full h-72 rounded-xl overflow-hidden"
                style={{ background: cropBg }}
              >
                <Cropper
                  image={imageSrc}
                  crop={crop}
                  zoom={zoom}
                  aspect={cropAspect}
                  cropShape="rect"
                  showGrid={true}
                  onCropChange={setCrop}
                  onZoomChange={setZoom}
                  onCropComplete={onCropComplete}
                />
              </div>

              {/* 缩放 + 重置 */}
              <div className="flex items-center gap-3 mt-4">
                <span style={{ color: "var(--ink-3)" }}><ZoomIn size={15} /></span>
                <input
                  type="range"
                  min={1}
                  max={3}
                  step={0.01}
                  value={zoom}
                  onChange={(e) => setZoom(Number(e.target.value))}
                  className="flex-1 h-1.5 rounded-full appearance-none cursor-pointer"
                  style={{ accentColor: "var(--accent)", background: "var(--panel-3)" }}
                  aria-label="缩放"
                />
                <span style={{ color: "var(--ink-3)" }}><ZoomIn size={19} /></span>
                <button
                  type="button"
                  onClick={() => {
                    setZoom(1);
                    setCrop({ x: 0, y: 0 });
                  }}
                  className="btn btn-line btn-sm shrink-0"
                  title="重置缩放与位置"
                >
                  <RotateCcw size={13} /> 重置
                </button>
              </div>
            </>
          )}

          {/* 铺法：仅固定画幅需要；原图模式图框随图，无需铺法 */}
          {!isFavicon && (
            isAuto ? (
              <p className="text-[11.5px] mt-3" style={{ color: "var(--ink-3)" }}>
                原图模式：整图使用不裁剪，页眉图框按图片原始比例自动给宽，图片完整不变形。
              </p>
            ) : (
              <div className="mt-3">
                <div className="flex items-center justify-between gap-3">
                  <span className="text-[12px] font-semibold shrink-0" style={{ color: "var(--ink-3)" }}>铺法</span>
                  <AdminSegmented
                    role="group"
                    size="sm"
                    ariaLabel="适配方式"
                    value={logoFit}
                    onChange={(v) => onFitChange?.(v)}
                    options={BRAND_LOGO_FITS.map((item) => ({ key: item.id, label: item.label }))}
                  />
                </div>
                <p className="text-[11.5px] mt-1.5" style={{ color: "var(--ink-3)" }}>
                  {logoFit === "contain"
                    ? "适应：完整显示图片，比例不匹配时留空（推荐）"
                    : logoFit === "cover"
                      ? "填充：裁切填满画幅"
                      : logoFit === "repeat"
                        ? "平铺：重复铺满画幅"
                        : "拉伸：变形填满画幅"}
                </p>
              </div>
            )
          )}

          {/* 页眉实时预览：深色 Logo 用深色衬底并局部反转文字变量 */}
          <div
            className="mt-3 rounded-xl px-3.5 py-2.5 flex items-center min-h-[56px]"
            style={{
              background: cropBg,
              ...(slot === "logo_dark"
                ? ({ "--ink": "#f5f6f8", "--ink-3": "rgba(255,255,255,.55)" } as CSSProperties)
                : null),
            }}
            aria-label="页眉预览"
          >
            <BrandLockup
              mode="image_text"
              size={effectiveSize}
              fit={logoFit}
              name="站点名称"
              wordmark=""
              logoLight={imageSrc || ""}
              logoDark=""
            />
          </div>

          {/* 输出说明 + 操作 */}
          <div className="flex items-center justify-between mt-5">
            <span className="text-[12px]" style={{ color: "var(--ink-3)" }}>
              {isAuto
                ? "输出 WebP · 高度 40px，宽度随原图比例"
                : `输出 WebP · 图框 ${brandLogoBox(effectiveSize).w}×${brandLogoBox(effectiveSize).h}px`}
            </span>
            <div className="flex items-center gap-2">
              <button type="button" onClick={backToLibrary} disabled={busy} className="btn btn-line btn-sm">
                <RotateCcw size={13.5} /> 重选
              </button>
              <button type="button" onClick={confirmUpload} disabled={busy} className="btn btn-primary btn-sm">
                {busy ? <Loader2 size={14} className="animate-spin" /> : <Check size={14} />}
                {busy ? "上传中" : "确认上传"}
              </button>
            </div>
          </div>
        </>
      )}
    </Modal>
  );
}