"use client";

import { useState, useEffect } from "react";
import Link from "next/link";
import { useRouter } from "next/navigation";
import { GitFork, History, Pencil, Trash2, Copy, Check } from "lucide-react";
import { apiForkSnippet, apiDeleteSnippet, apiMe } from "@/lib/api";
import type { SnippetDetail } from "@/lib/api";
import { toast } from "@/lib/toast";
import { snippetPath, snippetsPath, type UrlStyle } from "@/lib/urlStyle";
import Modal from "@/components/Modal";
import SnippetVersionModal from "@/components/SnippetVersionModal";

export default function SnippetActions({
  snippet,
  urlStyle,
  isOwner: initialIsOwner,
  isStaff: initialIsStaff,
}: {
  snippet: SnippetDetail;
  urlStyle: UrlStyle;
  isOwner: boolean;
  isStaff: boolean;
}) {
  const router = useRouter();
  const [isOwner, setIsOwner] = useState(initialIsOwner);
  const [isStaff, setIsStaff] = useState(initialIsStaff);
  const [forking, setForking] = useState(false);
  const [deleting, setDeleting] = useState(false);
  const [deleteOpen, setDeleteOpen] = useState(false);
  const [historyOpen, setHistoryOpen] = useState(false);
  const [copied, setCopied] = useState(false);

  useEffect(() => {
    apiMe()
      .then((res) => {
        if (res.user) {
          setIsOwner(res.user.id === snippet.user_id);
          setIsStaff(["admin", "moderator"].includes(res.user.role));
        }
      })
      .catch(() => {});
  }, [snippet.user_id]);

  const onFork = async () => {
    if (forking) return;
    setForking(true);
    try {
      const res = await apiForkSnippet(snippet.id);
      toast("已复制为你的私有副本，随便改改吧", "ok");
      // 直接进入编辑页，让"Fork 后可以演化"这件事立刻可见
      router.push(`/snippets/${res.snippet.id}/edit`);
    } catch (e) {
      toast(e instanceof Error ? e.message : "Fork 失败");
    } finally {
      setForking(false);
    }
  };

  const onDelete = async () => {
    if (deleting) return;
    setDeleting(true);
    try {
      await apiDeleteSnippet(snippet.id);
      toast("已删除", "ok");
      router.push(snippetsPath(urlStyle));
    } catch (e) {
      toast(e instanceof Error ? e.message : "删除失败");
    } finally {
      setDeleting(false);
      setDeleteOpen(false);
    }
  };

  const onCopyLink = async () => {
    try {
      const url = `${window.location.origin}${snippetPath(urlStyle, snippet.id)}`;
      await navigator.clipboard.writeText(url);
      setCopied(true);
      toast("链接已复制", "ok");
      window.setTimeout(() => setCopied(false), 1600);
    } catch {
      toast("复制失败");
    }
  };

  const btnBase =
    "h-8 px-3 inline-flex items-center gap-1.5 rounded-full text-[12.5px] font-medium transition-colors disabled:opacity-50 disabled:cursor-not-allowed";
  const btnNormal = {
    background: "var(--panel)",
    border: "1px solid var(--line)",
    color: "var(--ink-2)",
  } as const;

  return (
    <>
      <div className="flex flex-wrap items-center gap-2">
        <button
          type="button"
          onClick={onCopyLink}
          className={btnBase}
          style={btnNormal}
          title="复制片段链接"
        >
          {copied ? <Check size={13.5} /> : <Copy size={13.5} />}
          {copied ? "已复制" : "复制链接"}
        </button>

        {snippet.visibility === "public" && (
          <button
            type="button"
            onClick={onFork}
            disabled={forking}
            className={btnBase}
            style={btnNormal}
            title="把这份代码复制为你的私有副本，可任意修改，互不影响"
          >
            <GitFork size={13.5} />
            {forking ? "创建副本中…" : "Fork 副本"}
          </button>
        )}

        <button
          type="button"
          onClick={() => setHistoryOpen(true)}
          className={btnBase}
          style={btnNormal}
          title="查看版本历史"
        >
          <History size={13.5} /> 版本历史
        </button>

        {isOwner && (
          <Link
            href={`/snippets/${snippet.id}/edit`}
            className={btnBase}
            style={btnNormal}
            title="编辑片段"
          >
            <Pencil size={13.5} /> 编辑
          </Link>
        )}

        {(isOwner || isStaff) && (
          <button
            type="button"
            onClick={() => setDeleteOpen(true)}
            className={btnBase}
            style={{ ...btnNormal, color: "var(--danger)" }}
            title="删除片段"
          >
            <Trash2 size={13.5} /> 删除
          </button>
        )}
      </div>

      <Modal
        open={deleteOpen}
        title="删除片段"
        description="删除后不可恢复，确定要删除这个代码片段吗？"
        onClose={() => setDeleteOpen(false)}
        dismissOnOverlay
        maxWidthClass="max-w-sm"
        footer={
          <>
            <button type="button" className="btn btn-line btn-sm" onClick={() => setDeleteOpen(false)}>
              取消
            </button>
            <button
              type="button"
              className="btn btn-primary btn-sm"
              style={{ background: "var(--danger)", borderColor: "var(--danger)" }}
              onClick={onDelete}
              disabled={deleting}
            >
              {deleting ? "删除中…" : "确认删除"}
            </button>
          </>
        }
      >
        <p className="text-[13.5px]" style={{ color: "var(--ink-2)" }}>
          此操作不可撤销。
        </p>
      </Modal>

      <SnippetVersionModal
        open={historyOpen}
        onClose={() => setHistoryOpen(false)}
        snippetId={snippet.id}
        currentCode={snippet.code}
        currentTitle={snippet.title}
        currentLanguage={snippet.language}
        currentDescription={snippet.description}
      />
    </>
  );
}