"use client";

import { Eye, RefreshCw, Search } from "lucide-react";
import { useCallback, useMemo, useState } from "react";
import { useTranslation } from "react-i18next";

import { getAgentNodes } from "@/api/admin-agents";
import { AdminPageCard } from "@/components/admin/admin-page-card";
import { AdminTableLoadingRow } from "@/components/admin/admin-loading-state";
import { AdminTableNoResourceRow } from "@/components/admin/admin-no-resource-state";
import { AdminRowActionsMenu } from "@/components/admin/admin-row-actions-menu";
import { AdminStatusBadge } from "@/components/admin/admin-status-badge";
import { Button } from "@/components/ui/button";
import { Input } from "@/components/ui/input";
import { formatAdminCreditMajorDecimal } from "@/lib/money";
import {
  Select,
  SelectContent,
  SelectItem,
  SelectTrigger,
  SelectValue,
} from "@/components/ui/select";
import {
  Table,
  TableBody,
  TableCell,
  TableHead,
  TableHeader,
  TableRow,
} from "@/components/ui/table";
import { useAsyncEffect } from "@/hooks/use-async-effect";
import { useTranslationRef } from "@/hooks/use-translation-ref";
import type { AgentNodeRow } from "@/types/api/admin-agent";

function formatPercent(value: number | null | undefined): string {
  if (value == null || Number.isNaN(value)) {
    return "-";
  }

  return `${Number(value).toFixed(2).replace(/\.?0+$/, "")}%`;
}

function formatCredit(value: number | null | undefined): string {
  if (value == null || Number.isNaN(value)) {
    return "-";
  }

  return formatAdminCreditMajorDecimal(value);
}

function statusLabel(status: number, t: (key: string, options?: { defaultValue?: string }) => string): string {
  return status === 1
    ? t("statusEnabled", { defaultValue: "启用" })
    : t("statusDisabled", { defaultValue: "停用" });
}

type DirectoryStatusFilter = "all" | "enabled" | "disabled";

function directoryStatusLabel(
  value: DirectoryStatusFilter,
  t: (key: string, options?: { defaultValue?: string }) => string,
): string {
  switch (value) {
    case "enabled":
      return t("directoryStatus.enabled", { defaultValue: "仅启用" });
    case "disabled":
      return t("directoryStatus.disabled", { defaultValue: "仅停用" });
    default:
      return t("directoryStatus.all", { defaultValue: "全部状态" });
  }
}

export function AgentsDirectoryConsole(): React.ReactElement {
  const { t } = useTranslation(["agents", "common"]);
  const tRef = useTranslationRef(["agents", "common"]);

  const [items, setItems] = useState<AgentNodeRow[]>([]);
  const [loading, setLoading] = useState(true);
  const [err, setErr] = useState<string | null>(null);
  const [keyword, setKeyword] = useState("");
  const [status, setStatus] = useState<DirectoryStatusFilter>("all");
  const [reloadKey, setReloadKey] = useState(0);

  const parentNameMap = useMemo(
    () => new Map(items.map((item) => [item.id, item.name])),
    [items],
  );

  const load = useCallback(async () => {
    setLoading(true);
    setErr(null);
    try {
      const data = await getAgentNodes();
      setItems(data.items);
    } catch (error) {
      const message =
        error instanceof Error
          ? error.message
          : tRef.current("agents:loadFailed", { defaultValue: "加载代理列表失败" });
      setErr(message);
    } finally {
      setLoading(false);
    }
  }, [tRef]);

  useAsyncEffect(load, [load, reloadKey]);

  const filteredItems = useMemo(() => {
    const normalized = keyword.trim().toLowerCase();

    return items.filter((item) => {
      if (status === "enabled" && item.status !== 1) {
        return false;
      }
      if (status === "disabled" && item.status === 1) {
        return false;
      }
      if (!normalized) {
        return true;
      }

      const parentName = item.parent_id != null ? parentNameMap.get(item.parent_id) ?? "" : "";
      return [item.name, item.code, item.username ?? "", item.email ?? "", parentName]
        .join(" ")
        .toLowerCase()
        .includes(normalized);
    });
  }, [items, keyword, parentNameMap, status]);

  const totalOperatingAgents = useMemo(
    () => items.filter((item) => !item.is_root).length,
    [items],
  );
  const enabledOperatingAgents = useMemo(
    () => items.filter((item) => !item.is_root && item.status === 1).length,
    [items],
  );

  return (
    <div className="space-y-4">
      <div className="grid gap-3 sm:grid-cols-3">
        <div className="rounded-lg border border-border/70 bg-card px-4 py-3">
          <p className="text-xs text-muted-foreground">
            {t("summary.visibleAgents", { defaultValue: "当前可见经营代理数" })}
          </p>
          <p className="mt-1 text-2xl font-semibold tabular-nums">{totalOperatingAgents}</p>
        </div>
        <div className="rounded-lg border border-border/70 bg-card px-4 py-3">
          <p className="text-xs text-muted-foreground">
            {t("summary.enabledAgents", { defaultValue: "启用中的经营代理数" })}
          </p>
          <p className="mt-1 text-2xl font-semibold tabular-nums">{enabledOperatingAgents}</p>
        </div>
        <div className="rounded-lg border border-border/70 bg-card px-4 py-3">
          <p className="text-xs text-muted-foreground">
            {t("summary.visibleList", { defaultValue: "当前平铺列表条数" })}
          </p>
          <p className="mt-1 text-2xl font-semibold tabular-nums">{filteredItems.length}</p>
        </div>
      </div>

      <AdminPageCard
        title={t("listTitle", { defaultValue: "代理列表" })}
        actions={
          <Button
            type="button"
            variant="outline"
            size="sm"
            onClick={() => setReloadKey((value) => value + 1)}
            disabled={loading}
          >
            <RefreshCw className="mr-2 h-4 w-4" />
            {t("common:actions.refresh", { defaultValue: "刷新" })}
          </Button>
        }
      >
        <div className="mb-4 flex flex-col gap-3 lg:flex-row lg:items-center lg:justify-between">
          <div className="relative min-w-0 flex-1">
            <Search className="pointer-events-none absolute left-3 top-1/2 h-4 w-4 -translate-y-1/2 text-muted-foreground" />
            <Input
              value={keyword}
              onChange={(event) => setKeyword(event.target.value)}
              placeholder={t("listSearch", { defaultValue: "搜索代理名称 / 编码 / 登录名" })}
              className="pl-9"
            />
          </div>
          <div className="flex flex-wrap items-center gap-3">
            <Select
              value={status}
              onValueChange={(value) => setStatus((value ?? "all") as DirectoryStatusFilter)}
            >
              <SelectTrigger className="h-9 w-[150px]">
                <SelectValue>{() => directoryStatusLabel(status, t)}</SelectValue>
              </SelectTrigger>
              <SelectContent>
                {(["all", "enabled", "disabled"] as DirectoryStatusFilter[]).map((value) => (
                  <SelectItem key={value} value={value}>
                    {directoryStatusLabel(value, t)}
                  </SelectItem>
                ))}
              </SelectContent>
            </Select>
          </div>
        </div>

        {err ? (
          <div className="mb-4 rounded-md border border-destructive/30 bg-destructive/10 px-3 py-2 text-sm text-destructive">
            {err}
          </div>
        ) : null}

        <div className="overflow-x-auto">
          <Table>
            <TableHeader>
              <TableRow>
                <TableHead className="min-w-[140px]">{t("name", { defaultValue: "名称" })}</TableHead>
                <TableHead className="min-w-[120px]">{t("code", { defaultValue: "编码" })}</TableHead>
                <TableHead className="w-[90px]">{t("depth", { defaultValue: "层级" })}</TableHead>
                <TableHead className="w-[90px]">{t("status", { defaultValue: "状态" })}</TableHead>
                <TableHead className="min-w-[140px]">{t("parentAgent", { defaultValue: "上级代理" })}</TableHead>
                <TableHead className="min-w-[140px]">{t("username", { defaultValue: "登录名" })}</TableHead>
                <TableHead className="w-[110px] text-right">
                  {t("profile.totalShareRate", { defaultValue: "占成比例 (%)" })}
                </TableHead>
                <TableHead className="w-[110px] text-right">
                  {t("profile.rebateLimit", { defaultValue: "回水上限 (%)" })}
                </TableHead>
                <TableHead className="w-[130px] text-right">
                  {t("profile.creditLimit", { defaultValue: "授信额度" })}
                </TableHead>
                <TableHead className="w-[130px] text-right">
                  {t("lineUi.availableCredit", { defaultValue: "可下发" })}
                </TableHead>
                <TableHead className="sticky right-0 z-20 w-14 bg-muted text-center shadow-[-1px_0_0_rgba(203,213,225,0.7)]">
                  {t("common:table.actions", { defaultValue: "操作" })}
                </TableHead>
              </TableRow>
            </TableHeader>
            <TableBody>
              {loading ? (
                <AdminTableLoadingRow colSpan={11} />
              ) : filteredItems.length === 0 ? (
                <AdminTableNoResourceRow colSpan={11} />
              ) : (
                filteredItems.map((item) => {
                  const parentName =
                    item.parent_id != null ? parentNameMap.get(item.parent_id) ?? "-" : "-";
                  const profile = item.profile_summary;

                  return (
                    <TableRow key={item.id}>
                      <TableCell>
                        <div className="min-w-0">
                          <span className="block truncate text-sm font-semibold">{item.name}</span>
                        </div>
                      </TableCell>
                      <TableCell className="text-sm text-muted-foreground">
                        <span className="font-mono">{item.code}</span>
                      </TableCell>
                      <TableCell className="text-sm text-muted-foreground">
                        {item.depth}
                      </TableCell>
                      <TableCell>
                        {item.is_root ? (
                          <AdminStatusBadge tone="info">
                            {t("isRoot", { defaultValue: "根节点" })}
                          </AdminStatusBadge>
                        ) : (
                          <AdminStatusBadge tone={item.status === 1 ? "success" : "neutral"}>
                            {statusLabel(item.status, t)}
                          </AdminStatusBadge>
                        )}
                      </TableCell>
                      <TableCell>
                        <span className="text-sm">{parentName}</span>
                      </TableCell>
                      <TableCell>
                        <span className="text-sm">{item.username ?? "-"}</span>
                      </TableCell>
                      <TableCell className="text-right">
                        <span className="tabular-nums">{formatPercent(profile?.total_share_rate)}</span>
                      </TableCell>
                      <TableCell className="text-right">
                        <span className="tabular-nums">{formatPercent(profile?.rebate_limit)}</span>
                      </TableCell>
                      <TableCell className="text-right">
                        <span className="tabular-nums">{formatCredit(profile?.credit_limit)}</span>
                      </TableCell>
                      <TableCell className="text-right">
                        <span className="tabular-nums">{formatCredit(profile?.available_credit)}</span>
                      </TableCell>
                      <TableCell className="sticky right-0 z-10 bg-card text-center shadow-[-1px_0_0_rgba(203,213,225,0.7)]">
                        <AdminRowActionsMenu
                          actions={[
                            {
                              key: "view",
                              label: t("common:actions.viewDetails", { defaultValue: "查看详情" }),
                              icon: Eye,
                              href: `/admin/agents?agent_node_id=${item.id}`,
                            },
                          ]}
                        />
                      </TableCell>
                    </TableRow>
                  );
                })
              )}
            </TableBody>
          </Table>
        </div>
      </AdminPageCard>
    </div>
  );
}