"use client";

import { useEffect, useRef, useState } from "react";
import { CodeXml, Eye, GitFork, Copy, Search } from "lucide-react";
import Modal from "@/components/Modal";
import {
  apiMySnippets,
  apiSearchSnippets,
  type SnippetListItem,
} from "@/lib/api";
import { formatRelative } from "@/lib/format";
import { toast } from "@/lib/toast";

type Tab = "public" | "mine";

/**
 * 「插入片段」选择器：搜索公开广场 / 我的片段，点击插入 [snippet id=N] 指令。
 */
export default function SnippetPickerModal({
  open,
  onClose,
  onPick,
}: {
  open: boolean;
  onClose: () => void;
  onPick: (id: number) => void;
}) {
  const [tab, setTab] = useState<Tab>("public");
  const [q, setQ] = useState("");
  const [items, setItems] = useState<SnippetListItem[]>([]);
  const [loading, setLoading] = useState(false);
  const [loaded, setLoaded] = useState(false);
  const seq = useRef(0);

  // 打开时重置
  useEffect(() => {
    if (open) {
      setTab("public");
      setQ("");
    }
  }, [open]);

  useEffect(() => {
    if (!open) return;
    const mySeq = ++seq.current;
    setLoading(true);
    const timer = setTimeout(() => {
      const req =
        tab === "mine" ? apiMySnippets(q.trim(), 1, 20) : apiSearchSnippets({ q: q.trim(), size: 20 });
      req
        .then((res) => {
          if (seq.current !== mySeq) return;
          setItems(res.items);
          setLoaded(true);
        })
        .catch((e) => {
          if (seq.current !== mySeq) return;
          toast(e instanceof Error ? e.message : "加载失败");
        })
        .finally(() => {
          if (seq.current === mySeq) setLoading(false);
        });
    }, 300);
    return () => clearTimeout(timer);
  }, [open, tab, q]);

  return (
    <Modal
      open={open}
      title="插入代码片段"
      description="选择要嵌入的片段，正文中将插入 [snippet id=N] 指令"
      onClose={onClose}
      dismissOnOverlay
      maxWidthClass="max-w-lg"
      panelClassName="p-0 flex flex-col max-h-[80vh]"
      bodyClassName="flex flex-col min-h-0"
    >
      <div className="px-5 pt-4 pb-3 flex items-center gap-2" style={{ borderBottom: "1px solid var(--line)" }}>
        <div
          className="flex rounded-lg p-0.5 text-[12.5px] font-semibold shrink-0"
          style={{ background: "var(--panel-2)" }}
          role="tablist"
          aria-label="片段来源"
        >
          {(
            [
              ["public", "公开广场"],
              ["mine", "我的片段"],
            ] as [Tab, string][]
          ).map(([key, label]) => (
            <button
              key={key}
              type="button"
              role="tab"
              aria-selected={tab === key}
              className="px-3 py-1 rounded-md transition-colors"
              style={
                tab === key
                  ? { background: "var(--panel)", color: "var(--ink)", boxShadow: "0 1px 2px rgba(0,0,0,0.08)" }
                  : { color: "var(--ink-3)" }
              }
              onClick={() => setTab(key)}
            >
              {label}
            </button>
          ))}
        </div>
        <div className="relative flex-1 min-w-0">
          <Search
            size={13}
            className="absolute left-2.5 top-1/2 -translate-y-1/2 pointer-events-none"
            style={{ color: "var(--ink-3)" }}
          />
          <input
            autoFocus
            value={q}
            onChange={(e) => setQ(e.target.value)}
            placeholder="搜索标题或描述…"
            aria-label="搜索片段"
            className="w-full rounded-lg pl-7 pr-3 py-1.5 text-[13px]"
            style={{ background: "var(--bg)", border: "1px solid var(--line)", color: "var(--ink)" }}
          />
        </div>
      </div>

      <div className="flex-1 min-h-0 overflow-y-auto px-3 py-2">
        {loading && !loaded ? (
          <p className="meta text-center py-10 text-[12.5px]">加载中…</p>
        ) : items.length === 0 ? (
          <p className="meta text-center py-10 text-[12.5px]">
            {tab === "mine" ? "还没有自己的片段，去片段广场新建一个吧" : "没有匹配的片段"}
          </p>
        ) : (
          <ul className="flex flex-col gap-1">
            {items.map((it) => (
              <li key={it.id}>
                <button
                  type="button"
                  className="w-full text-left rounded-xl px-3 py-2.5 transition-colors hover:bg-[var(--panel-2)]"
                  onClick={() => {
                    onPick(it.id);
                    onClose();
                  }}
                >
                  <span className="flex items-center gap-2 min-w-0">
                    <CodeXml size={14} className="shrink-0" style={{ color: "var(--accent)" }} />
                    <span className="truncate text-[13.5px] font-semibold" style={{ color: "var(--ink)" }}>
                      {it.title}
                    </span>
                    <span
                      className="shrink-0 rounded-full px-1.5 py-px text-[10.5px] font-semibold"
                      style={{ background: "var(--panel-2)", color: "var(--ink-3)" }}
                    >
                      {it.language}
                    </span>
                    {it.visibility === "private" && (
                      <span
                        className="shrink-0 rounded-full px-1.5 py-px text-[10.5px]"
                        style={{ background: "var(--panel-2)", color: "var(--ink-3)" }}
                      >
                        私有
                      </span>
                    )}
                  </span>
                  <span className="mt-1 flex items-center gap-3 text-[11.5px]" style={{ color: "var(--ink-3)" }}>
                    <span className="inline-flex items-center gap-1">
                      <Copy size={11} /> {it.copy_count}
                    </span>
                    <span className="inline-flex items-center gap-1">
                      <Eye size={11} /> {it.view_count}
                    </span>
                    <span className="inline-flex items-center gap-1">
                      <GitFork size={11} /> {it.fork_count}
                    </span>
                    <span className="ml-auto shrink-0">{formatRelative(it.created_at)}</span>
                  </span>
                </button>
              </li>
            ))}
          </ul>
        )}
      </div>
    </Modal>
  );
}