"use client";

import {
  useCallback,
  useEffect,
  useMemo,
  useRef,
  useState,
  type KeyboardEvent,
  type MouseEvent,
} from "react";
import { CaretDown, FloppyDisk, X } from "@phosphor-icons/react";
import {
  filterFlockSavedFreight,
  loadFlockSavedFreight,
  persistFlockSavedFreight,
  removeFlockSavedFreight,
  upsertFlockSavedFreight,
  buildFlockSavedFreightPreset,
  type FlockSavedFreightPreset,
  type FlockSavedFreightSource,
} from "@/lib/flock/saved-freight-presets";
import { quoteInputCls } from "@/components/quote/quote-form-chrome";

const inputCls = quoteInputCls;

type Props = {
  customerId: string;
  disabled?: boolean;
  /** 保存后递增，触发搜索列表刷新 */
  revision?: number;
};

/** 顶部：搜索并选用常用货件 */
export function FlockSavedFreightSearch({
  customerId,
  disabled,
  revision = 0,
  onSelect,
}: Props & { onSelect: (preset: FlockSavedFreightPreset) => void }) {
  const [presets, setPresets] = useState<FlockSavedFreightPreset[]>([]);
  const [query, setQuery] = useState("");
  const [open, setOpen] = useState(false);
  const rootRef = useRef<HTMLDivElement>(null);

  const reload = useCallback(() => {
    setPresets(loadFlockSavedFreight(customerId));
  }, [customerId]);

  useEffect(() => {
    reload();
  }, [reload, revision]);

  useEffect(() => {
    const onDoc = (e: globalThis.MouseEvent) => {
      if (!rootRef.current?.contains(e.target as Node)) setOpen(false);
    };
    document.addEventListener("mousedown", onDoc);
    return () => document.removeEventListener("mousedown", onDoc);
  }, []);

  const filtered = useMemo(
    () => filterFlockSavedFreight(presets, query),
    [presets, query],
  );

  const remove = (id: string, e: MouseEvent | KeyboardEvent) => {
    e.stopPropagation();
    e.preventDefault();
    const next = removeFlockSavedFreight(presets, id);
    persistFlockSavedFreight(customerId, next);
    setPresets(next);
  };

  return (
    <div ref={rootRef} className="relative">
      <input
        disabled={disabled}
        value={query}
        onChange={(e) => {
          setQuery(e.target.value);
          setOpen(true);
        }}
        onFocus={() => setOpen(true)}
        placeholder={
          presets.length ? "搜索已保存的货件名称或描述" : "暂无常用货件，请先在货品描述处保存"
        }
        className={`${inputCls} pr-8`}
        autoComplete="off"
      />
      <CaretDown
        size={14}
        className="pointer-events-none absolute right-3 top-1/2 -translate-y-1/2 text-text-disabled"
      />
      {open ? (
        <ul className="absolute z-20 mt-1 max-h-56 w-full overflow-auto rounded-md border border-border bg-surface py-1 shadow-lg">
          {filtered.length === 0 ? (
            <li className="px-3 py-2 text-xs text-text-secondary">
              {presets.length === 0
                ? "尚无保存记录"
                : "无匹配货件"}
            </li>
          ) : (
            filtered.map((p) => (
              <li key={p.id}>
                <button
                  type="button"
                  disabled={disabled}
                  className="flex w-full items-start gap-2 px-3 py-2 text-left text-sm hover:bg-bg disabled:opacity-50"
                  onClick={() => {
                    onSelect(p);
                    setQuery(p.name);
                    setOpen(false);
                  }}
                >
                  <span className="min-w-0 flex-1">
                    <span className="block font-medium text-text-primary">
                      {p.name}
                    </span>
                    {p.description && p.description !== p.name ? (
                      <span className="mt-0.5 block truncate text-xs text-text-secondary">
                        {p.description}
                      </span>
                    ) : null}
                  </span>
                  <span
                    role="button"
                    tabIndex={0}
                    aria-label={`删除常用货件 ${p.name}`}
                    className="mt-0.5 shrink-0 rounded p-0.5 text-text-secondary hover:bg-[#FEE2E2] hover:text-[#EF4444]"
                    onClick={(e) => remove(p.id, e)}
                    onKeyDown={(e) => {
                      if (e.key === "Enter" || e.key === " ") {
                        remove(p.id, e);
                      }
                    }}
                  >
                    <X size={14} />
                  </span>
                </button>
              </li>
            ))
          )}
        </ul>
      ) : null}
    </div>
  );
}

/** 货品描述旁：保存当前货物行为常用货件 */
export function FlockSaveFreightButton({
  customerId,
  disabled,
  source,
  onSaved,
}: Props & {
  source: FlockSavedFreightSource;
  onSaved?: () => void;
}) {
  const [open, setOpen] = useState(false);
  const [name, setName] = useState("");
  const [hint, setHint] = useState<string | null>(null);

  useEffect(() => {
    if (open) {
      setName(source.description.trim());
      setHint(null);
    }
  }, [open, source.description]);

  const save = () => {
    const preset = buildFlockSavedFreightPreset(source, name);
    if (!preset) {
      setHint("请先填写货品描述或货件名称");
      return;
    }
    const list = loadFlockSavedFreight(customerId);
    const next = upsertFlockSavedFreight(list, preset);
    persistFlockSavedFreight(customerId, next);
    setOpen(false);
    setHint("已保存到常用货件");
    onSaved?.();
    window.setTimeout(() => setHint(null), 2000);
  };

  return (
    <div className="mt-2 space-y-2">
      {!open ? (
        <button
          type="button"
          disabled={disabled}
          onClick={() => setOpen(true)}
          className="inline-flex items-center gap-1 text-xs font-medium text-[#1890FF] hover:underline disabled:opacity-50"
        >
          <FloppyDisk size={14} />
          存为常用货件
        </button>
      ) : (
        <div className="rounded-md border border-border bg-bg px-3 py-2">
          <p className="mb-1.5 text-xs text-[#4B5563]">货件名称（便于搜索）</p>
          <div className="flex flex-wrap items-center gap-2">
            <input
              disabled={disabled}
              value={name}
              onChange={(e) => setName(e.target.value)}
              className={`${inputCls} !h-9 min-w-[12rem] flex-1 text-sm`}
              placeholder="如：标准木托家电"
            />
            <button
              type="button"
              disabled={disabled}
              onClick={save}
              className="h-9 rounded-md bg-[#1890FF] px-3 text-xs font-medium text-white hover:opacity-90 disabled:opacity-50"
            >
              保存
            </button>
            <button
              type="button"
              disabled={disabled}
              onClick={() => setOpen(false)}
              className="h-9 rounded-md px-2 text-xs text-text-secondary hover:bg-surface"
            >
              取消
            </button>
          </div>
        </div>
      )}
      {hint ? <p className="text-xs text-[#16A34A]">{hint}</p> : null}
    </div>
  );
}