"use client";

import { useRef, useState } from "react";
import Link from "next/link";
import { Loader2, Upload } from "lucide-react";
import { apiApplyFriendLink, apiUploadPostImage } from "@/lib/api";
import { densitySrcSet, isOwnImage, pickVariantWidth, variantURL } from "@/lib/responsiveImage";

interface Props {
  isLoggedIn: boolean;
  canManage: boolean;
  /** 关闭所在弹窗（取消按钮）；弹窗外渲染时可不传 */
  onClose?: () => void;
}

interface FormState {
  name: string;
  url: string;
  reciprocal_url: string;
  logo_url: string;
}

const EMPTY_FORM: FormState = {
  name: "",
  url: "",
  reciprocal_url: "",
  logo_url: "",
};

const FIELD_CLASS =
  "w-full rounded-lg px-3 py-2 text-[14px] outline-none transition-colors";
const FIELD_STYLE = {
  background: "var(--panel-2)",
  color: "var(--ink)",
  border: "1px solid var(--line)",
};

export default function LinksClient({ isLoggedIn, canManage, onClose }: Props) {
  const [form, setForm] = useState<FormState>(EMPTY_FORM);
  const [submitting, setSubmitting] = useState(false);
  const [uploading, setUploading] = useState(false);
  const [msg, setMsg] = useState<{ ok: boolean; text: string } | null>(null);
  const fileRef = useRef<HTMLInputElement>(null);

  if (!isLoggedIn) {
    return (
      <p className="meta mt-3">
        请先 <Link href="/login" className="underline hover:text-[var(--accent)]">登录</Link> 后申请友情链接。
      </p>
    );
  }

  const set = (k: keyof FormState, v: string) =>
    setForm((f) => ({ ...f, [k]: v }));

  const onPickFile = async (file: File | undefined) => {
    if (!file || uploading) return;
    setUploading(true);
    setMsg(null);
    try {
      const res = await apiUploadPostImage(file, file.name);
      if (res.url) {
        set("logo_url", res.url);
      } else {
        setMsg({ ok: false, text: res.error || "上传失败，请稍后重试" });
      }
    } catch {
      setMsg({ ok: false, text: "上传失败，请稍后重试" });
    } finally {
      setUploading(false);
      if (fileRef.current) fileRef.current.value = "";
    }
  };

  const onSubmit = async (e: React.FormEvent) => {
    e.preventDefault();
    if (submitting) return;
    setMsg(null);
    setSubmitting(true);
    try {
      await apiApplyFriendLink({
        name: form.name.trim(),
        url: form.url.trim(),
        reciprocal_url: form.reciprocal_url.trim() || undefined,
        logo_url: form.logo_url.trim() || undefined,
      });
      setMsg({ ok: true, text: "申请已提交，待管理员审核通过后展示。" });
      setForm(EMPTY_FORM);
    } catch (e) {
      setMsg({ ok: false, text: e instanceof Error ? e.message : "提交失败，请重试" });
    } finally {
      setSubmitting(false);
    }
  };

  return (
    <form onSubmit={onSubmit} className="mt-5 space-y-4">
      <label className="block">
        <span className="block text-[13.5px] font-medium" style={{ color: "var(--ink)" }}>
          网站名称
        </span>
        <input
          required
          maxLength={64}
          value={form.name}
          onChange={(e) => set("name", e.target.value)}
          className={`${FIELD_CLASS} mt-1.5`}
          style={FIELD_STYLE}
          placeholder="请输入您的网站名称"
        />
      </label>

      <label className="block">
        <span className="block text-[13.5px] font-medium" style={{ color: "var(--ink)" }}>
          网站链接
        </span>
        <input
          required
          type="url"
          maxLength={512}
          value={form.url}
          onChange={(e) => set("url", e.target.value)}
          className={`${FIELD_CLASS} mt-1.5`}
          style={FIELD_STYLE}
          placeholder="请输入您的网站地址（以http开头）"
        />
      </label>

      <label className="block">
        <span className="block text-[13.5px] font-medium" style={{ color: "var(--ink)" }}>
          添加我方链接的页面地址
        </span>
        <input
          type="url"
          maxLength={512}
          value={form.reciprocal_url}
          onChange={(e) => set("reciprocal_url", e.target.value)}
          className={`${FIELD_CLASS} mt-1.5`}
          style={FIELD_STYLE}
          placeholder="如：https://您的域名/link.htm（非首页时必填）"
        />
        <span className="meta mt-1.5 block text-[12px]">
          若友链不在首页，请填写此页面地址，方便管理员核对是否添加了我方链接
        </span>
      </label>

      <div className="block">
        <span className="block text-[13.5px] font-medium" style={{ color: "var(--ink)" }}>
          填写或上传本站LOGO
        </span>
        <div className="mt-1.5 flex items-stretch gap-2">
          {/* 预览 */}
          <span
            className="flex w-16 shrink-0 items-center justify-center rounded-lg text-[11px] meta overflow-hidden"
            style={{ border: "1px dashed var(--line)", background: "var(--panel-2)" }}
            aria-hidden
          >
            {form.logo_url ? (
              // 64px 预览位：本站图走 96/160 变体；外链地址保持原样
              // eslint-disable-next-line @next/next/no-img-element
              <img
                src={isOwnImage(form.logo_url) ? variantURL(form.logo_url, pickVariantWidth(64)) : form.logo_url}
                srcSet={isOwnImage(form.logo_url) ? densitySrcSet(form.logo_url, 64) : undefined}
                alt=""
                className="h-full w-full object-contain"
                onError={(e) => {
                  (e.target as HTMLImageElement).style.display = "none";
                }}
              />
            ) : (
              "预览"
            )}
          </span>
          <input
            type="url"
            maxLength={512}
            value={form.logo_url}
            onChange={(e) => set("logo_url", e.target.value)}
            className={FIELD_CLASS}
            style={FIELD_STYLE}
            placeholder="LOGO图片地址"
          />
          <button
            type="button"
            onClick={() => fileRef.current?.click()}
            disabled={uploading}
            className="btn btn-line shrink-0 whitespace-nowrap"
          >
            {uploading ? <Loader2 size={14} className="animate-spin" /> : <Upload size={14} />}
            上传
          </button>
          <input
            ref={fileRef}
            type="file"
            accept="image/*"
            className="hidden"
            onChange={(e) => onPickFile(e.target.files?.[0])}
          />
        </div>
      </div>

      {msg ? (
        <p
          className="text-[13px] rounded-lg px-3 py-2"
          style={{
            background: msg.ok ? "var(--accent-soft)" : "var(--panel-2)",
            color: msg.ok ? "var(--accent)" : "var(--ink)",
            border: "1px solid var(--line)",
          }}
        >
          {msg.text}
        </p>
      ) : null}

      <div className="flex items-center gap-3 pt-1">
        <p className="meta flex-1 text-[12px]">
          提交后进入待审核状态，可在「我的申请」中查看进度或修改
        </p>
        <button
          type="button"
          className="btn btn-line"
          onClick={() => {
            if (onClose) {
              onClose();
            } else {
              setForm(EMPTY_FORM);
              setMsg(null);
            }
          }}
          disabled={submitting}
        >
          取消
        </button>
        <button type="submit" disabled={submitting} className="btn btn-primary">
          {submitting ? "提交中…" : "提交申请"}
        </button>
      </div>

      {canManage ? (
        <p className="meta text-[12px]">
          管理员可前往{" "}
          <Link href="/admin/friend-links" className="underline hover:text-[var(--accent)]">
            友情链接管理
          </Link>{" "}
          审批
        </p>
      ) : null}
    </form>
  );
}