import { useMutation, useQuery, useQueryClient } from "@tanstack/react-query";
import { Check, Pencil, Plus, X } from "lucide-react";
import { useState } from "react";
import { api } from "../api/client";
import type { Book } from "../api/types";
import { Button } from "@/components/ui/button";
import { Input } from "@/components/ui/input";
import { toast } from "./Toaster";

type Locator = Record<string, unknown>;

/** 书签面板内容(供 ReaderNav 的「书签」选项卡承载);跳转后由调用方负责关抽屉. */
export function BookmarksTab({
  book,
  capture,
  seek,
}: {
  book: Book;
  capture: () => { locator: Locator; percent: number };
  seek: (locator: Locator) => void;
}) {
  const qc = useQueryClient();
  const [note, setNote] = useState("");
  const [editId, setEditId] = useState<number | null>(null);
  const [editVal, setEditVal] = useState("");
  const q = useQuery({ queryKey: ["bookmarks", book.id], queryFn: () => api.listBookmarks(book.id) });
  const items = q.data ?? [];
  const invalidate = () => qc.invalidateQueries({ queryKey: ["bookmarks", book.id] });
  const fail = (e: unknown) => toast("err", e instanceof Error ? e.message : "书签操作失败");

  const add = useMutation({
    mutationFn: () => {
      const { locator, percent } = capture();
      return api.createBookmark(book.id, locator, percent, note.trim());
    },
    onSuccess: () => {
      setNote("");
      invalidate();
      toast("ok", "已加书签");
    },
    onError: fail,
  });
  const patch = useMutation({
    mutationFn: (v: { id: number; note: string }) => api.patchBookmark(v.id, v.note),
    onSuccess: () => {
      setEditId(null);
      invalidate();
    },
    onError: fail,
  });
  const del = useMutation({
    mutationFn: (id: number) => api.deleteBookmark(id),
    onSuccess: invalidate,
    onError: fail,
  });

  return (
    <>
      <div className="mb-2 flex items-center gap-1.5">
        <Input
          className="min-w-0 flex-1"
          placeholder="备注(可空)"
          maxLength={500}
          value={note}
          onChange={(e) => setNote(e.target.value)}
          onKeyDown={(e) => {
            if (e.key === "Enter" && !add.isPending) add.mutate();
          }}
        />
        <Button
          variant="ghost"
          size="icon-xs"
          className="shrink-0"
          aria-label="加书签"
          disabled={add.isPending}
          onClick={() => add.mutate()}
        >
          <Plus size={14} />
        </Button>
      </div>
      <ul className="space-y-0.5">
        {q.isPending && <li className="p-2 text-xs text-muted-foreground">加载中…</li>}
        {!q.isPending && items.length === 0 && (
          <li className="p-2 text-xs text-muted-foreground">还没有书签,读到想记的位置点「加」</li>
        )}
        {items.map((b) => (
          <li key={b.id}>
            {editId === b.id ? (
              <div className="flex items-center gap-1">
                <Input
                  className="min-w-0 flex-1"
                  maxLength={500}
                  value={editVal}
                  onChange={(e) => setEditVal(e.target.value)}
                  onKeyDown={(e) => {
                    if (e.key === "Enter" && !patch.isPending) patch.mutate({ id: b.id, note: editVal.trim() });
                  }}
                />
                <Button
                  variant="ghost"
                  size="icon-xs"
                  className="shrink-0"
                  aria-label="保存备注"
                  disabled={patch.isPending}
                  onClick={() => patch.mutate({ id: b.id, note: editVal.trim() })}
                >
                  <Check size={14} />
                </Button>
                <Button
                  variant="ghost"
                  size="icon-xs"
                  className="shrink-0"
                  aria-label="取消编辑"
                  onClick={() => setEditId(null)}
                >
                  <X size={14} />
                </Button>
              </div>
            ) : (
              <div className="group flex items-center">
                <button
                  className="min-w-0 flex-1 truncate rounded-md px-2.5 py-1.5 text-left text-sm transition-colors hover:bg-accent hover:text-accent-foreground"
                  title={b.note || undefined}
                  onClick={() => seek(b.locator)}
                >
                  <span className="tabular-nums opacity-70">{Math.round(b.percent * 100)}%</span>{" "}
                  {b.note || <span className="opacity-50">{b.created_at.slice(0, 10)}</span>}
                </button>
                <Button
                  variant="ghost"
                  size="icon-xs"
                  className="m-0.5 shrink-0 opacity-0 transition-opacity group-hover:opacity-100 focus-visible:opacity-100"
                  aria-label="改备注"
                  onClick={() => {
                    setEditId(b.id);
                    setEditVal(b.note);
                  }}
                >
                  <Pencil size={14} />
                </Button>
                <Button
                  variant="ghost"
                  size="icon-xs"
                  className="m-0.5 shrink-0 opacity-0 transition-opacity group-hover:opacity-100 focus-visible:opacity-100"
                  aria-label="删除书签"
                  onClick={() => del.mutate(b.id)}
                >
                  <X size={14} />
                </Button>
              </div>
            )}
          </li>
        ))}
      </ul>
    </>
  );
}