import { ArrowDownUp, Coins, Search } from "lucide-react";
import { useCallback, useState, type FormEvent } from "react";
import { useSearchParams } from "react-router-dom";
import { adminApi } from "../../api/client";
import type { LedgerQuery } from "../../api/types";
import {
  Button,
  Card,
  ErrorState,
  Input,
  LoadingState,
  PageHeader,
} from "../../components/primitives";
import { useCursorPage } from "../../hooks/use-cursor-page";
import { formatNumber } from "../../lib/format";
import { LedgerFilters } from "./ledger-filters";
import { LedgerTable } from "./ledger-table";
import { useLedgerFilters } from "./use-ledger-filters";

export function CreditsPage() {
  const [searchParams, setSearchParams] = useSearchParams();
  const initialUserId = searchParams.get("userId") ?? "";
  const [query, setQuery] = useState(initialUserId);
  const [activeUserId, setActiveUserId] = useState(initialUserId);
  const filters = useLedgerFilters();
  const fetchLedger = useCallback(
    (value: LedgerQuery) =>
      activeUserId ? adminApi.ledger(activeUserId, value) : adminApi.latestLedger(value),
    [activeUserId],
  );
  const {
    items,
    nextCursor,
    loading,
    loadingMore,
    error,
    loadMore,
    reload,
  } = useCursorPage(filters.query, fetchLedger);

  function submit(event: FormEvent<HTMLFormElement>) {
    event.preventDefault();
    const userId = query.trim();
    setActiveUserId(userId);
    setSearchParams((current) => {
      const params = new URLSearchParams(current);
      if (userId) params.set("userId", userId);
      else params.delete("userId");
      return params;
    }, { replace: true });
  }

  const hasBusinessFilter = Boolean(
    filters.state.from ||
      filters.state.until ||
      filters.state.type ||
      filters.state.entryType ||
      filters.state.usageType ||
      filters.state.referenceId,
  );

  return (
    <div className="space-y-6">
      <PageHeader
        eyebrow="积分账本"
        title="积分流水"
        description="从账务动作、业务来源和消费能力三个维度查看不可变积分账本。"
      />

      <Card className="overflow-hidden">
        <div className="border-b border-border p-5 sm:p-6">
          <form className="flex max-w-2xl flex-col gap-3 sm:flex-row" onSubmit={submit}>
            <label className="relative flex-1">
              <span className="sr-only">内部用户 ID</span>
              <Search
                className="pointer-events-none absolute left-3.5 top-1/2 size-4 -translate-y-1/2 text-muted"
                aria-hidden
              />
              <Input
                className="pl-10"
                value={query}
                onChange={(event) => setQuery(event.target.value)}
                type="search"
                placeholder="输入完整用户 ID，留空查看全部"
                maxLength={36}
                autoComplete="off"
              />
            </label>
            <Button type="submit">
              <ArrowDownUp className="size-4" aria-hidden />
              查询流水
            </Button>
          </form>
        </div>

        <LedgerFilters
          value={filters.state}
          onChange={filters.update}
          onClear={filters.clear}
        />

        <div className="flex items-center gap-3 border-b border-border bg-surface-muted/35 px-5 py-3 text-xs text-muted sm:px-6">
          <Coins className="size-4 text-primary" aria-hidden />
          <span>{activeUserId ? "指定用户流水" : "最新积分流水"}</span>
          <span aria-hidden>·</span>
          <strong className="font-semibold text-foreground">{formatNumber(items.length)} 条</strong>
          {activeUserId ? (
            <span className="ml-auto max-w-64 truncate font-mono" title={activeUserId}>
              {activeUserId}
            </span>
          ) : null}
        </div>

        {error ? (
          <div className="p-6">
            <ErrorState error={error} retry={reload} />
          </div>
        ) : loading ? (
          <LoadingState label="加载积分流水" />
        ) : (
          <LedgerTable
            entries={items}
            caption={activeUserId ? `用户 ${activeUserId} 的积分流水` : "最新积分流水"}
            emptyTitle={
              activeUserId || hasBusinessFilter
                ? "没有符合当前用户和筛选条件的流水"
                : "暂无积分流水"
            }
            showUser={!activeUserId}
            sort={filters.state.sort}
            order={filters.state.order}
            onSortChange={(sort, order) => filters.update({ sort, order })}
            onReferenceFilter={(referenceId) => filters.update({ referenceId })}
            footer={
              nextCursor ? (
                <div className="flex justify-center border-t border-border p-5">
                  <Button variant="secondary" onClick={() => void loadMore()} loading={loadingMore}>
                    加载更多流水
                  </Button>
                </div>
              ) : null
            }
          />
        )}
      </Card>
    </div>
  );
}