"use client";

import { useCallback, useEffect, useState } from "react";
import Link from "next/link";
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 { Card } from "@/components/ui/card";
import { WarningBanner } from "@/components/ui/warning-banner";
import {
  adminCreateCustomer,
  adminGetCustomers,
  adminGetProviderCredentials,
  adminRotateCustomerKey,
  adminUpdateCustomer,
  adminUpsertProviderCredential,
  type ProviderCredentialProvider,
  type ProviderCredentialRecord,
} from "@/lib/frontend/api-client";
import { formatDateTime } from "@/lib/frontend/format";
import { useAuth } from "@/hooks/use-auth";
import type { DataPageStatus, HostCustomerRecord } from "@/lib/frontend/types";

const PAGE_SIZE = 10;

export default function AdminCustomersPage() {
  const { token } = useAuth();
  const [status, setStatus] = useState<DataPageStatus>("loading");
  const [rows, setRows] = useState<HostCustomerRecord[]>([]);
  const [total, setTotal] = useState(0);
  const [page, setPage] = useState(1);
  const [keyword, setKeyword] = useState("");

  const [createOpen, setCreateOpen] = useState(false);
  const [createName, setCreateName] = useState("");
  const [createRemark, setCreateRemark] = useState("");
  const [createPassword, setCreatePassword] = useState("123456");
  const [createBindCreds, setCreateBindCreds] = useState(false);
  const [createFlockEmail, setCreateFlockEmail] = useState("");
  const [createFlockPassword, setCreateFlockPassword] = useState("");
  const [createMsEmail, setCreateMsEmail] = useState("");
  const [createMsPassword, setCreateMsPassword] = useState("");
  const [creating, setCreating] = useState(false);
  const [createError, setCreateError] = useState<string | undefined>();

  const [passwordTarget, setPasswordTarget] = useState<HostCustomerRecord | null>(
    null,
  );
  const [newPassword, setNewPassword] = useState("");
  const [confirmPassword, setConfirmPassword] = useState("");
  const [passwordError, setPasswordError] = useState<string | undefined>();
  const [savingPassword, setSavingPassword] = useState(false);

  const [revealedKey, setRevealedKey] = useState<{
    customer_id: string;
    api_key: string;
  } | null>(null);

  const [actionError, setActionError] = useState<string | null>(null);
  const [rotatingId, setRotatingId] = useState<string | null>(null);

  const [credTarget, setCredTarget] = useState<HostCustomerRecord | null>(null);
  const [credList, setCredList] = useState<ProviderCredentialRecord[]>([]);
  const [credError, setCredError] = useState<string | undefined>();
  const [credLoading, setCredLoading] = useState(false);
  const [showCredPassword, setShowCredPassword] = useState<{
    flock: boolean;
    mothership: boolean;
  }>({ flock: false, mothership: false });

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

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

  const resetCreateForm = () => {
    setCreateName("");
    setCreateRemark("");
    setCreatePassword("123456");
    setCreateBindCreds(false);
    setCreateFlockEmail("");
    setCreateFlockPassword("");
    setCreateMsEmail("");
    setCreateMsPassword("");
    setCreateError(undefined);
  };

  const saveProviderCred = async (
    customerId: string,
    provider: ProviderCredentialProvider,
    email: string,
    password: string,
  ): Promise<string | null> => {
    if (!token) return "未登录";
    const trimmedEmail = email.trim();
    const trimmedPassword = password.trim();
    if (!trimmedEmail && !trimmedPassword) return null;
    if (!trimmedEmail || !trimmedEmail.includes("@")) {
      return `${provider === "flock" ? "Flock Freight" : "MotherShip"}：请填写有效登录邮箱`;
    }
    if (!trimmedPassword) {
      return `${provider === "flock" ? "Flock Freight" : "MotherShip"}：首次配置必须填写密码`;
    }
    const res = await adminUpsertProviderCredential("", token, customerId, {
      provider,
      email: trimmedEmail,
      password: trimmedPassword,
    });
    if (res.code !== 0) return res.message;
    return null;
  };

  const handleCreate = async () => {
    if (!token) return;
    const name = createName.trim();
    if (!name) {
      setCreateError("请填写客户名称");
      return;
    }
    if (createBindCreds) {
      const hasAny =
        createFlockEmail.trim() ||
        createFlockPassword.trim() ||
        createMsEmail.trim() ||
        createMsPassword.trim();
      if (!hasAny) {
        setCreateError("已勾选绑定查价网站账密，请至少填写一套邮箱和密码");
        return;
      }
    }

    setCreating(true);
    setCreateError(undefined);
    const res = await adminCreateCustomer("", token, {
      name,
      remark: createRemark.trim() || undefined,
      embed_password: createPassword.trim() || undefined,
    });

    if (res.code !== 0) {
      setCreating(false);
      setCreateError(res.message);
      return;
    }

    const customerId = res.data.customer_id;
    if (createBindCreds) {
      const flockErr = await saveProviderCred(
        customerId,
        "flock",
        createFlockEmail,
        createFlockPassword,
      );
      if (flockErr) {
        setCreating(false);
        setCreateError(`客户已创建，但 Flock 账密保存失败：${flockErr}`);
        setRevealedKey({ customer_id: customerId, api_key: res.data.api_key });
        setCreateOpen(false);
        resetCreateForm();
        void load(1, keyword);
        setPage(1);
        return;
      }
      const msErr = await saveProviderCred(
        customerId,
        "mothership",
        createMsEmail,
        createMsPassword,
      );
      if (msErr) {
        setCreating(false);
        setCreateError(`客户已创建，但 MotherShip 账密保存失败：${msErr}`);
        setRevealedKey({ customer_id: customerId, api_key: res.data.api_key });
        setCreateOpen(false);
        resetCreateForm();
        void load(1, keyword);
        setPage(1);
        return;
      }
    }

    setCreating(false);
    setCreateOpen(false);
    resetCreateForm();
    setRevealedKey({
      customer_id: customerId,
      api_key: res.data.api_key,
    });
    void load(1, keyword);
    setPage(1);
  };

  const handleToggleStatus = async (row: HostCustomerRecord) => {
    if (!token) return;
    setActionError(null);
    const nextStatus = row.status === "active" ? "disabled" : "active";
    const res = await adminUpdateCustomer("", token, row.customer_id, {
      status: nextStatus,
    });
    if (res.code !== 0) {
      setActionError(res.message);
      return;
    }
    setRows((list) =>
      list.map((item) =>
        item.customer_id === row.customer_id ? res.data : item,
      ),
    );
  };

  const openPasswordDrawer = (row: HostCustomerRecord) => {
    setPasswordTarget(row);
    setNewPassword("");
    setConfirmPassword("");
    setPasswordError(undefined);
  };

  const handleSavePassword = async () => {
    if (!token || !passwordTarget) return;
    if (newPassword.length < 6) {
      setPasswordError("密码至少 6 位");
      return;
    }
    if (newPassword !== confirmPassword) {
      setPasswordError("两次输入的密码不一致");
      return;
    }

    setSavingPassword(true);
    setPasswordError(undefined);
    const res = await adminUpdateCustomer("", token, passwordTarget.customer_id, {
      embed_password: newPassword,
    });
    setSavingPassword(false);

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

    setRows((list) =>
      list.map((item) =>
        item.customer_id === passwordTarget.customer_id ? res.data : item,
      ),
    );
    setPasswordTarget(null);
  };

  const handleRotateKey = async (customerId: string) => {
    if (!token) return;
    setRotatingId(customerId);
    setActionError(null);
    const res = await adminRotateCustomerKey("", token, customerId);
    setRotatingId(null);
    if (res.code !== 0) {
      setActionError(res.message);
      return;
    }
    setRevealedKey({ customer_id: customerId, api_key: res.data.api_key });
    void load(page, keyword);
  };

  const openCredDrawer = async (row: HostCustomerRecord) => {
    if (!token) return;
    setCredTarget(row);
    setCredError(undefined);
    setShowCredPassword({ flock: false, mothership: false });
    setCredLoading(true);
    const res = await adminGetProviderCredentials("", token, row.customer_id);
    setCredLoading(false);
    if (res.code !== 0) {
      setCredError(res.message);
      setCredList([]);
      return;
    }
    setCredList(res.data.list);
  };

  const flockCredSummary = credList.find((c) => c.provider === "flock");
  const msCredSummary = credList.find((c) => c.provider === "mothership");

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

  return (
    <AdminLayout>
      <PageHeader
        title="客户管理"
        subtitle="在管理端创建客户并签发 API Key，无需修改服务器 .env"
        action={
          <PrimaryButton
            onClick={() => {
              resetCreateForm();
              setCreateOpen(true);
            }}
          >
            新建客户
          </PrimaryButton>
        }
      />

      {revealedKey && (
        <div className="mb-4">
          <WarningBanner>
            <div className="space-y-2 text-left">
              <p className="font-medium">
                客户 {revealedKey.customer_id} 的 API Key
              </p>
              <p className="break-all font-mono text-sm">{revealedKey.api_key}</p>
              <p className="text-xs text-text-secondary">
                已保存到客户资料，可随时查看当前有效 Key。调用方式：Authorization:
                {" "}Bearer &lt;Key&gt;；Header X-Customer-Id: {revealedKey.customer_id}
              </p>
              <SecondaryButton onClick={() => setRevealedKey(null)}>
                我已保存
              </SecondaryButton>
            </div>
          </WarningBanner>
        </div>
      )}

      {actionError && (
        <div className="mb-4">
          <ErrorBanner>{actionError}</ErrorBanner>
        </div>
      )}

      <div className="mb-4 w-64">
        <InputField
          label="搜索"
          placeholder="客户 ID 或名称"
          value={keyword}
          onChange={(e) => {
            setPage(1);
            setKeyword(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>
          }
        >
          加载客户列表失败
        </ErrorBanner>
      )}

      {status === "empty" && (
        <Card className="p-8 text-center text-text-secondary">
          暂无客户，点击「新建客户」创建第一个租户
        </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">客户 ID</th>
                  <th className="px-4 py-3 font-medium">名称</th>
                  <th className="px-4 py-3 font-medium">状态</th>
                  <th className="px-4 py-3 font-medium">当前 API Key</th>
                  <th className="px-4 py-3 font-medium">演示密码</th>
                  <th className="px-4 py-3 font-medium">备注</th>
                  <th className="px-4 py-3 font-medium">创建时间</th>
                  <th className="px-4 py-3 font-medium">操作</th>
                </tr>
              </thead>
              <tbody>
                {rows.map((row) => (
                  <tr key={row.customer_id} className="border-t border-border">
                    <td className="px-4 py-3 font-mono">{row.customer_id}</td>
                    <td className="px-4 py-3">{row.name}</td>
                    <td className="px-4 py-3">
                      {row.status === "active" ? "启用" : "停用"}
                    </td>
                    <td className="px-4 py-3 font-mono text-text-secondary">
                      {row.active_api_key ? (
                        <span className="break-all">{row.active_api_key}</span>
                      ) : (
                        <span>历史 Key 未保存原文，请轮换一次 Key</span>
                      )}
                    </td>
                    <td className="px-4 py-3 text-text-secondary">
                      {row.embed_password_set ? "已设置" : "未设置"}
                    </td>
                    <td className="px-4 py-3 text-text-secondary">
                      {row.remark || "—"}
                    </td>
                    <td className="px-4 py-3 text-text-secondary">
                      {formatDateTime(row.created_at)}
                    </td>
                    <td className="px-4 py-3">
                      <div className="flex flex-wrap gap-2">
                        <SecondaryButton
                          onClick={() => openPasswordDrawer(row)}
                        >
                          设置密码
                        </SecondaryButton>
                        <SecondaryButton
                          onClick={() => void openCredDrawer(row)}
                        >
                          查价网站账密
                        </SecondaryButton>
                        <SecondaryButton
                          onClick={() => void handleToggleStatus(row)}
                        >
                          {row.status === "active" ? "停用" : "启用"}
                        </SecondaryButton>
                        <SecondaryButton
                          loading={rotatingId === row.customer_id}
                          disabled={row.status !== "active"}
                          onClick={() => void handleRotateKey(row.customer_id)}
                        >
                          轮换 Key
                        </SecondaryButton>
                        <Link href={`/admin/markup?keyword=${encodeURIComponent(row.customer_id)}`}>
                          <SecondaryButton>加价配置</SecondaryButton>
                        </Link>
                      </div>
                    </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>
      )}

      {createOpen && (
        <div
          className="fixed inset-0 z-50 flex justify-end bg-black/30"
          onClick={() => !creating && setCreateOpen(false)}
        >
          <div
            className="h-full w-full max-w-lg overflow-y-auto bg-surface p-6 shadow-lg"
            onClick={(e) => e.stopPropagation()}
          >
            <h3 className="text-lg font-semibold">新建客户</h3>
            <p className="mt-1 text-sm text-text-secondary">
              创建后将自动生成 API Key；可选绑定 MotherShip / Flock Freight
              官网账密，用于该客户查价登录拿折扣价。
            </p>
            <div className="mt-6 space-y-4">
              <InputField
                label="客户名称"
                value={createName}
                disabled={creating}
                error={createError}
                onChange={(e) => setCreateName(e.target.value)}
              />
              <InputField
                label="嵌入演示密码"
                type="password"
                autoComplete="new-password"
                value={createPassword}
                disabled={creating}
                onChange={(e) => setCreatePassword(e.target.value)}
              />
              <InputField
                label="备注"
                value={createRemark}
                disabled={creating}
                onChange={(e) => setCreateRemark(e.target.value)}
              />

              <label className="flex cursor-pointer items-start gap-3 rounded-md border border-border bg-bg px-3 py-3">
                <input
                  type="checkbox"
                  className="mt-1 h-4 w-4"
                  checked={createBindCreds}
                  disabled={creating}
                  onChange={(e) => setCreateBindCreds(e.target.checked)}
                />
                <span>
                  <span className="block text-sm font-medium text-text-primary">
                    绑定查价网站账密
                  </span>
                  <span className="mt-0.5 block text-xs text-text-secondary">
                    仅新建时可写入；写入后管理端只能查看，不可修改。不勾选则走匿名/Direct
                    原线路
                  </span>
                </span>
              </label>

              {createBindCreds && (
                <div className="space-y-5 rounded-md border border-border p-4">
                  <div className="space-y-3">
                    <p className="text-sm font-medium">Flock Freight</p>
                    <InputField
                      label="登录邮箱"
                      type="email"
                      autoComplete="off"
                      value={createFlockEmail}
                      disabled={creating}
                      onChange={(e) => setCreateFlockEmail(e.target.value)}
                      placeholder="Flock 官网登录邮箱"
                    />
                    <InputField
                      label="密码"
                      type="password"
                      autoComplete="new-password"
                      value={createFlockPassword}
                      disabled={creating}
                      onChange={(e) => setCreateFlockPassword(e.target.value)}
                    />
                  </div>
                  <div className="space-y-3 border-t border-border pt-4">
                    <p className="text-sm font-medium">MotherShip</p>
                    <InputField
                      label="登录邮箱"
                      type="email"
                      autoComplete="off"
                      value={createMsEmail}
                      disabled={creating}
                      onChange={(e) => setCreateMsEmail(e.target.value)}
                      placeholder="MotherShip 官网登录邮箱"
                    />
                    <InputField
                      label="密码"
                      type="password"
                      autoComplete="new-password"
                      value={createMsPassword}
                      disabled={creating}
                      onChange={(e) => setCreateMsPassword(e.target.value)}
                    />
                  </div>
                </div>
              )}
            </div>
            <div className="mt-8 flex justify-end gap-3">
              <SecondaryButton
                disabled={creating}
                onClick={() => {
                  setCreateOpen(false);
                  resetCreateForm();
                }}
              >
                取消
              </SecondaryButton>
              <PrimaryButton loading={creating} onClick={() => void handleCreate()}>
                创建并生成 Key
              </PrimaryButton>
            </div>
          </div>
        </div>
      )}

      {passwordTarget && (
        <div
          className="fixed inset-0 z-50 flex justify-end bg-black/30"
          onClick={() => !savingPassword && setPasswordTarget(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">设置嵌入演示密码</h3>
            <p className="mt-1 text-sm text-text-secondary">
              客户 {passwordTarget.customer_id}（{passwordTarget.name}
              ）在 /embed-demo 登录时使用此密码
            </p>
            <form
              className="mt-6 space-y-4"
              autoComplete="off"
              onSubmit={(e) => {
                e.preventDefault();
                void handleSavePassword();
              }}
            >
              <InputField
                label="新密码"
                type="password"
                autoComplete="new-password"
                value={newPassword}
                disabled={savingPassword}
                error={passwordError}
                onChange={(e) => setNewPassword(e.target.value)}
              />
              <InputField
                label="确认密码"
                type="password"
                autoComplete="new-password"
                value={confirmPassword}
                disabled={savingPassword}
                onChange={(e) => setConfirmPassword(e.target.value)}
              />
              <div className="flex justify-end gap-3 pt-4">
                <SecondaryButton
                  type="button"
                  disabled={savingPassword}
                  onClick={() => setPasswordTarget(null)}
                >
                  取消
                </SecondaryButton>
                <PrimaryButton type="submit" loading={savingPassword}>
                  保存
                </PrimaryButton>
              </div>
            </form>
          </div>
        </div>
      )}

      {credTarget && (
        <div
          className="fixed inset-0 z-50 flex justify-end bg-black/30"
          onClick={() => setCredTarget(null)}
        >
          <div
            className="h-full w-full max-w-lg overflow-y-auto bg-surface p-6 shadow-lg"
            onClick={(e) => e.stopPropagation()}
          >
            <h3 className="text-lg font-semibold">查价网站账密</h3>
            <p className="mt-1 text-sm text-text-secondary">
              客户 {credTarget.customer_id}（{credTarget.name}
              ）。仅供查看；账密在新建客户时写入，本页不提供修改。有账密时该客户查价强制官网登录。
            </p>
            {credLoading ? (
              <p className="mt-6 text-sm text-text-secondary">加载中…</p>
            ) : (
              <div className="mt-6 space-y-6">
                {credError && <ErrorBanner>{credError}</ErrorBanner>}
                {(
                  [
                    {
                      key: "flock" as const,
                      title: "Flock Freight",
                      summary: flockCredSummary,
                    },
                    {
                      key: "mothership" as const,
                      title: "MotherShip",
                      summary: msCredSummary,
                    },
                  ] as const
                ).map(({ key, title, summary }) => (
                  <div
                    key={key}
                    className="space-y-3 rounded-md border border-border p-4"
                  >
                    <div className="flex items-center justify-between gap-2">
                      <p className="text-sm font-medium">{title}</p>
                      <span className="text-xs text-text-secondary">
                        {summary?.has_password ? "已配置" : "未配置"}
                      </span>
                    </div>
                    {summary?.has_password ? (
                      <>
                        <div>
                          <p className="text-xs text-text-secondary">登录邮箱</p>
                          <p className="mt-1 break-all font-mono text-sm">
                            {summary.email || "—"}
                          </p>
                        </div>
                        <div>
                          <div className="flex items-center justify-between gap-2">
                            <p className="text-xs text-text-secondary">密码</p>
                            <button
                              type="button"
                              className="text-xs text-[#1890FF] hover:underline"
                              onClick={() =>
                                setShowCredPassword((s) => ({
                                  ...s,
                                  [key]: !s[key],
                                }))
                              }
                            >
                              {showCredPassword[key] ? "隐藏" : "显示"}
                            </button>
                          </div>
                          <p className="mt-1 break-all font-mono text-sm">
                            {showCredPassword[key]
                              ? summary.password || "（无法解密，请核对 JWT_SECRET）"
                              : "••••••••"}
                          </p>
                        </div>
                        {summary.updated_at ? (
                          <p className="text-xs text-text-secondary">
                            更新时间 {formatDateTime(summary.updated_at)}
                          </p>
                        ) : null}
                      </>
                    ) : (
                      <p className="text-sm text-text-secondary">
                        未绑定官网账密（新建客户时可勾选写入）
                      </p>
                    )}
                  </div>
                ))}

                <div className="flex justify-end">
                  <SecondaryButton
                    type="button"
                    onClick={() => setCredTarget(null)}
                  >
                    关闭
                  </SecondaryButton>
                </div>
              </div>
            )}
          </div>
        </div>
      )}
    </AdminLayout>
  );
}