"use client";

import { Suspense, useCallback, useEffect, useRef, useState } from "react";
import { useSearchParams } from "next/navigation";
import { AdminLayout } from "@/components/layout/admin-layout";
import { PageHeader } from "@/components/layout/page-header";
import { Skeleton } from "@/components/ui/skeleton";
import { ErrorBanner } from "@/components/ui/error-banner";
import { SecondaryButton } from "@/components/ui/primary-button";
import { PrimaryButton } from "@/components/ui/primary-button";
import { InputField } from "@/components/ui/input-field";
import { SelectField } from "@/components/ui/select-field";
import { Card } from "@/components/ui/card";
import {
  adminGetMarkupConfigs,
  adminUpdateMarkupConfig,
} from "@/lib/frontend/api-client";
import { formatDateTime, formatPercent, formatUSD } from "@/lib/frontend/format";
import { useAuth } from "@/hooks/use-auth";
import type { DataPageStatus, MarkupConfig, MarkupType } from "@/lib/frontend/types";

const PAGE_SIZE = 10;

function formatMarkupSummary(row: MarkupConfig): string {
  if (row.markup_type === "fixed") {
    const amount = row.markup_fixed_amount ?? 0;
    return amount > 0 ? `固定 ${formatUSD(amount)}` : "未配置";
  }
  return row.markup_percent > 0 ? formatPercent(row.markup_percent) : "0%";
}

/** 业务客户展示：始终「客户代码 · 客户名称」（不展示表 UUID） */
function formatBusinessCustomerLabel(row: MarkupConfig): string {
  const code = (row.business_customer_code ?? "").trim();
  const name = (row.business_customer_name ?? "").trim();
  if (code && name) {
    return `${code} · ${name}`;
  }
  if (code) return code;
  if (name) return name;
  return row.business_customer_id || "—";
}

function AdminMarkupPageContent() {
  const { token, user } = useAuth();
  const searchParams = useSearchParams();
  const [status, setStatus] = useState<DataPageStatus>("loading");
  const [rows, setRows] = useState<MarkupConfig[]>([]);
  const [total, setTotal] = useState(0);
  const [page, setPage] = useState(1);
  const [keywordInput, setKeywordInput] = useState(
    () => searchParams.get("keyword") ?? "",
  );
  const [keyword, setKeyword] = useState(
    () => searchParams.get("keyword") ?? "",
  );
  const loadSeqRef = useRef(0);

  const [editing, setEditing] = useState<MarkupConfig | null>(null);
  const [markupType, setMarkupType] = useState<MarkupType>("percent");
  const [percent, setPercent] = useState("");
  const [fixedAmount, setFixedAmount] = useState("");
  const [remark, setRemark] = useState("");
  const [saving, setSaving] = useState(false);
  const [fieldError, setFieldError] = useState<string | undefined>();

  const load = useCallback(
    async (p: number, kw: string) => {
      if (!token) return;
      const seq = ++loadSeqRef.current;
      setStatus("loading");
      const res = await adminGetMarkupConfigs("", token, p, PAGE_SIZE, kw);
      if (seq !== loadSeqRef.current) return;
      if (res.code !== 0) {
        setStatus("error");
        return;
      }
      setRows(res.data.list);
      setTotal(res.data.total);
      setStatus(res.data.total === 0 ? "empty" : "success");
    },
    [token],
  );

  useEffect(() => {
    const t = window.setTimeout(() => {
      const next = keywordInput.trim();
      setKeyword((prev) => {
        if (prev === next) return prev;
        setPage(1);
        return next;
      });
    }, 300);
    return () => window.clearTimeout(t);
  }, [keywordInput]);

  useEffect(() => {
    void load(page, keyword);
  }, [load, page, keyword]);

  const openEdit = (row: MarkupConfig) => {
    setEditing(row);
    setMarkupType(row.markup_type);
    setPercent(String(row.markup_percent));
    setFixedAmount(
      row.markup_fixed_amount !== null ? String(row.markup_fixed_amount) : "",
    );
    setRemark(row.remark ?? "");
    setFieldError(undefined);
  };

  const handleSave = async () => {
    if (!editing || !token || !user) return;

    if (markupType === "percent") {
      const n = Number(percent);
      if (Number.isNaN(n) || n < 0 || n > 30) {
        setFieldError("加价比例须在 0~30% 之间");
        return;
      }
    } else {
      const n = Number(fixedAmount);
      if (Number.isNaN(n) || n < 0) {
        setFieldError("固定加价金额须 ≥ 0");
        return;
      }
    }

    setSaving(true);
    const res = await adminUpdateMarkupConfig("", token, editing.customer_id, {
      markup_type: markupType,
      markup_percent:
        markupType === "percent" ? Number(percent) : undefined,
      markup_fixed_amount:
        markupType === "fixed" ? Number(fixedAmount) : undefined,
      business_customer_id: editing.business_customer_id ?? undefined,
      remark,
    });
    setSaving(false);

    if (res.code !== 0) {
      setFieldError(res.message);
      return;
    }

    setRows((list) =>
      list.map((r) =>
        r.customer_id === res.data.customer_id &&
        (r.business_customer_id ?? null) ===
          (res.data.business_customer_id ?? null)
          ? {
              ...res.data,
              // 为何这样改：旧 PUT 响应可能无 name/code，保留原展示字段避免变成 UUID
              business_customer_code:
                res.data.business_customer_code ?? r.business_customer_code,
              business_customer_name:
                res.data.business_customer_name ?? r.business_customer_name,
            }
          : r,
      ),
    );
    setEditing(null);
  };

  const totalPages = Math.max(1, Math.ceil(total / PAGE_SIZE));

  return (
    <AdminLayout>
      <PageHeader
        title="加价配置"
        subtitle="仅业务客户加价生效；未配置时按 0% 处理"
        action={
          <div className="w-64">
            <InputField
              label="搜索租户/客户"
              placeholder="租户 / 客户代码 SP012 / 名称 / 账号 STARPOST"
              value={keywordInput}
              onChange={(e) => setKeywordInput(e.target.value)}
            />
          </div>
        }
      />

      {status === "loading" && (
        <div className="space-y-2">
          {Array.from({ length: 5 }).map((_, i) => (
            <Skeleton key={i} className="h-14 w-full" />
          ))}
        </div>
      )}

      {status === "error" && (
        <ErrorBanner
          action={
            <SecondaryButton onClick={() => void load(page, keyword)}>
              重试
            </SecondaryButton>
          }
        >
          加载加价配置失败
        </ErrorBanner>
      )}

      {status === "empty" && (
        <Card className="p-8 text-center text-text-secondary">
          {keyword
            ? `未找到匹配「${keyword}」的租户或业务客户。可试：客户代码 SP012、名称 STAR、登录账号 STARPOST（数字 0 勿输成字母 O）`
            : "暂无业务客户，请先在「租户管理」同步或新增客户"}
        </Card>
      )}

      {status === "success" && (
        <div className="space-y-4">
          <div className="overflow-x-auto rounded-md border border-border">
            <table className="min-w-full text-sm">
              <thead className="bg-bg text-left text-text-secondary">
                <tr>
                  <th className="px-4 py-3 font-medium">租户 ID</th>
                  <th className="px-4 py-3 font-medium">业务客户</th>
                  <th className="px-4 py-3 font-medium">加价方式</th>
                  <th className="px-4 py-3 font-medium">加价规则</th>
                  <th className="px-4 py-3 font-medium">操作人</th>
                  <th className="px-4 py-3 font-medium">备注</th>
                  <th className="px-4 py-3 font-medium">更新时间</th>
                  <th className="px-4 py-3 font-medium">操作</th>
                </tr>
              </thead>
              <tbody>
                {rows.map((row) => (
                  <tr
                    key={`${row.customer_id}:${row.business_customer_id ?? "default"}`}
                    className="border-t border-border"
                  >
                    <td className="px-4 py-3 font-mono">{row.customer_id}</td>
                    <td className="px-4 py-3">
                      <div className="font-medium text-text">
                        {formatBusinessCustomerLabel(row)}
                      </div>
                    </td>
                    <td className="px-4 py-3">
                      {row.markup_type === "fixed" ? "固定金额" : "百分比"}
                    </td>
                    <td className="px-4 py-3 font-mono text-primary">
                      {formatMarkupSummary(row)}
                    </td>
                    <td className="px-4 py-3 text-text-secondary">
                      {row.operator_id || "—"}
                    </td>
                    <td className="px-4 py-3 text-text-secondary">
                      {row.remark || "—"}
                    </td>
                    <td className="px-4 py-3 text-text-secondary">
                      {row.operator_id
                        ? formatDateTime(row.updated_at)
                        : "—"}
                    </td>
                    <td className="px-4 py-3">
                      <SecondaryButton onClick={() => openEdit(row)}>
                        编辑
                      </SecondaryButton>
                    </td>
                  </tr>
                ))}
              </tbody>
            </table>
          </div>

          <div className="flex items-center justify-between text-sm text-text-secondary">
            <span>
              共 {total} 条，第 {page} / {totalPages} 页
            </span>
            <div className="flex gap-2">
              <SecondaryButton
                disabled={page <= 1}
                onClick={() => setPage((p) => Math.max(1, p - 1))}
              >
                上一页
              </SecondaryButton>
              <SecondaryButton
                disabled={page >= totalPages}
                onClick={() => setPage((p) => p + 1)}
              >
                下一页
              </SecondaryButton>
            </div>
          </div>
        </div>
      )}

      {editing && (
        <div
          className="fixed inset-0 z-50 flex justify-end bg-black/30"
          onClick={() => !saving && setEditing(null)}
        >
          <div
            className="h-full w-full max-w-md bg-surface p-6 shadow-lg"
            onClick={(e) => e.stopPropagation()}
          >
            <h3 className="text-lg font-semibold">
              编辑加价 · {editing.customer_id}
              {` / ${formatBusinessCustomerLabel(editing)}`}
            </h3>
            <p className="mt-1 text-sm text-text-secondary">
              百分比仅对运费加价（上限 30%，步长 0.01%）；固定金额为每档报价叠加固定金额。
            </p>
            <div className="mt-6 space-y-4">
              <SelectField
                label="加价方式"
                value={markupType}
                disabled={saving}
                options={[
                  { value: "percent", label: "按运费百分比" },
                  { value: "fixed", label: "固定金额（USD）" },
                ]}
                onChange={(e) =>
                  setMarkupType(e.target.value as MarkupType)
                }
              />
              {markupType === "percent" ? (
                <InputField
                  label="加价比例 (%)"
                  type="number"
                  step="0.01"
                  min={0}
                  max={30}
                  value={percent}
                  disabled={saving}
                  error={fieldError}
                  onChange={(e) => setPercent(e.target.value)}
                />
              ) : (
                <InputField
                  label="固定加价金额 (USD)"
                  type="number"
                  step="0.01"
                  min={0}
                  value={fixedAmount}
                  disabled={saving}
                  error={fieldError}
                  onChange={(e) => setFixedAmount(e.target.value)}
                />
              )}
              <InputField
                label="备注"
                value={remark}
                disabled={saving}
                onChange={(e) => setRemark(e.target.value)}
              />
            </div>
            <div className="mt-8 flex justify-end gap-3">
              <SecondaryButton disabled={saving} onClick={() => setEditing(null)}>
                取消
              </SecondaryButton>
              <PrimaryButton loading={saving} onClick={() => void handleSave()}>
                保存
              </PrimaryButton>
            </div>
          </div>
        </div>
      )}
    </AdminLayout>
  );
}

export default function AdminMarkupPage() {
  return (
    <Suspense
      fallback={
        <AdminLayout>
          <PageHeader title="加价配置" subtitle="按客户设置报价加价" />
          <Skeleton className="h-64 w-full" />
        </AdminLayout>
      }
    >
      <AdminMarkupPageContent />
    </Suspense>
  );
}