import { useState } from "react";
import { useNavigate } from "react-router-dom";
import toast from "react-hot-toast";
import { Turnstile } from "@marsidev/react-turnstile";
import { motion } from "framer-motion";

import { Card, CardBody, CardHeader } from "@/shadcn-bridge/heroui/card";
import { Input } from "@/shadcn-bridge/heroui/input";
import { Button } from "@/shadcn-bridge/heroui/button";
import { siteConfig } from "@/config/site";
import { VersionFooter } from "@/components/version-footer";
import { BrandLogo } from "@/components/brand-logo";
import { login, LoginData, checkCaptcha, getPublicConfigByName } from "@/api";
import { writeLoginSession } from "@/utils/session";
import { useWebViewMode } from "@/hooks/useWebViewMode";

interface LoginForm {
  username: string;
  password: string;
  captchaId: string;
}

export default function IndexPage() {
  const [form, setForm] = useState<LoginForm>({
    username: "",
    password: "",
    captchaId: "",
  });
  const [loading, setLoading] = useState(false);
  const [errors, setErrors] = useState<Partial<LoginForm>>({});
  const [showCaptcha, setShowCaptcha] = useState(false);
  const [siteKey, setSiteKey] = useState("");
  const navigate = useNavigate();
  const isWebView = useWebViewMode();

  // 验证表单
  const validateForm = (): boolean => {
    const newErrors: Partial<LoginForm> = {};

    if (!form.username.trim()) {
      newErrors.username = "请输入用户名";
    }

    if (!form.password.trim()) {
      newErrors.password = "请输入密码";
    } else if (form.password.length < 6) {
      newErrors.password = "密码长度至少6位";
    }

    setErrors(newErrors);

    return Object.keys(newErrors).length === 0;
  };

  // 处理输入变化
  const handleInputChange = (field: keyof LoginForm, value: string) => {
    setForm((prev) => ({ ...prev, [field]: value }));
    // 清除该字段的错误
    if (errors[field]) {
      setErrors((prev) => ({ ...prev, [field]: undefined }));
    }
  };

  // 执行登录请求
  const performLogin = async (captchaToken?: string) => {
    try {
      const finalCaptchaId =
        typeof captchaToken === "string" && captchaToken.trim()
          ? captchaToken
          : form.captchaId;

      const loginData: LoginData = {
        username: form.username.trim(),
        password: form.password,
        captchaId: finalCaptchaId,
      };

      const response = await login(loginData);

      if (response.code !== 0) {
        toast.error(response.msg || "登录失败");
        if (showCaptcha) {
          setForm((prev) => ({ ...prev, captchaId: "" }));
        }

        return;
      }

      // 检查是否需要强制修改密码
      if (response.data.requirePasswordChange) {
        writeLoginSession(response.data);
        toast.success("检测到默认密码，即将跳转到修改密码页面");
        navigate("/change-password");

        return;
      }

      // 保存登录信息
      writeLoginSession(response.data);

      // 登录成功
      toast.success("登录成功");
      navigate("/dashboard");
    } catch {
      toast.error("网络错误，请稍后重试");
    } finally {
      setLoading(false);
    }
  };

  const handleLogin = async () => {
    if (!validateForm()) return;

    setLoading(true);

    try {
      // 先检查是否需要验证码
      const checkResponse = await checkCaptcha();

      if (checkResponse.code !== 0) {
        toast.error("检查验证码状态失败，请重试" + checkResponse.msg);
        setLoading(false);

        return;
      }

      // 根据返回值决定是否显示验证码
      if (checkResponse.data === 0) {
        await performLogin();
      } else {
        const configResp = await getPublicConfigByName("cloudflare_site_key");

        if (configResp.code === 0 && configResp.data && configResp.data.value) {
          setSiteKey(configResp.data.value);
          setShowCaptcha(true);
        } else {
          toast.error("未配置Cloudflare Site Key，请联系管理员");
          setLoading(false);
        }
      }
    } catch (error) {
      toast.error("网络错误，请稍后重试" + error);
      setLoading(false);
    }
  };

  const handleKeyPress = (e: React.KeyboardEvent) => {
    if (e.key === "Enter" && !loading) {
      handleLogin();
    }
  };

  return (
    <div className="relative flex flex-col min-h-screen bg-mesh-gradient overflow-hidden">
      <section className="flex flex-col items-center justify-center flex-1 w-full p-4 relative z-10">
        <motion.div
          animate={{ opacity: 1, y: 0 }}
          className="w-full max-w-[420px] px-4 sm:px-0"
          initial={{ opacity: 0, y: 24 }}
          transition={{ duration: 0.35, ease: [0.25, 0.46, 0.45, 0.94] }}
        >
          <Card className="w-full bg-white/20 dark:bg-zinc-900/20 backdrop-blur-3xl shadow-[0_20px_40px_rgba(0,0,0,0.15)] border-white/80 dark:border-white/10 rounded-[32px] p-2 sm:p-4">
            <CardHeader className="pb-0 pt-6 px-6 flex-col items-center">
              <BrandLogo className="w-14 h-14 rounded-2xl mb-4" size={56} />
              <h1 className="text-2xl font-bold tracking-tight text-foreground">
                {siteConfig.name}
              </h1>
              <p className="text-sm text-default-500 mt-2 font-medium">
                Sign in to manage your networks
              </p>
            </CardHeader>
            <CardBody className="px-6 py-6 mt-2">
              <div className="flex flex-col gap-5">
                <Input
                  classNames={{
                    inputWrapper:
                      "bg-white/10 dark:bg-white/5 backdrop-blur-md border border-white/30 dark:border-white/10 h-12 shadow-sm rounded-xl",
                    input: "text-base font-medium",
                  }}
                  errorMessage={errors.username}
                  isDisabled={loading}
                  isInvalid={!!errors.username}
                  label="Username"
                  placeholder="admin"
                  value={form.username}
                  variant="bordered"
                  onChange={(e) =>
                    handleInputChange("username", e.target.value)
                  }
                  onKeyDown={handleKeyPress}
                />

                <Input
                  classNames={{
                    inputWrapper:
                      "bg-white/10 dark:bg-white/5 backdrop-blur-md border border-white/30 dark:border-white/10 h-12 shadow-sm rounded-xl",
                    input: "text-base font-medium tracking-wider",
                  }}
                  isDisabled={loading}
                  isInvalid={!!errors.password}
                  label="Password"
                  placeholder="••••••••"
                  type="password"
                  value={form.password}
                  variant="bordered"
                  onChange={(e) =>
                    handleInputChange("password", e.target.value)
                  }
                  onKeyDown={handleKeyPress}
                />

                <Button
                  className="mt-4 h-12 rounded-xl bg-primary text-white font-bold text-base shadow-[0_8px_16px_rgba(0,122,255,0.3)] transition-transform active:scale-[0.98]"
                  disabled={loading}
                  isLoading={loading}
                  onPress={handleLogin}
                >
                  {loading
                    ? showCaptcha
                      ? "Verifying..."
                      : "Signing in..."
                    : "Sign In"}
                </Button>
              </div>
            </CardBody>
          </Card>
        </motion.div>

        {/* 版权信息 - 固定在底部，不占据布局空间 */}

        <VersionFooter
          containerClassName="fixed inset-x-0 bottom-4 text-center py-4"
          poweredClassName="text-xs text-gray-400 dark:text-gray-500"
          updateBadgeClassName="ml-2 inline-flex items-center rounded-full bg-rose-500/90 px-2 py-0.5 text-[10px] font-semibold tracking-wide text-white"
          version={isWebView ? siteConfig.app_version : siteConfig.version}
          versionClassName="text-xs text-gray-400 dark:text-gray-500 mt-1"
        />

        {/* 验证码弹层 */}
        {showCaptcha && siteKey && (
          <div className="fixed inset-0 z-50 flex items-center justify-center">
            {/* 背景遮罩层 - 模糊效果，暗黑模式下更深 */}
            <button
              className="absolute inset-0 bg-black/60 dark:bg-black/80 backdrop-blur-sm captcha-backdrop-enter"
              type="button"
              onClick={() => {
                setShowCaptcha(false);
                setLoading(false);
              }}
              onKeyDown={(e) => {
                if (e.key === "Enter" || e.key === " ") {
                  setShowCaptcha(false);
                  setLoading(false);
                }
              }}
            />
            {/* 验证码容器 */}
            <div className="mb-4 relative z-50 bg-white dark:bg-zinc-900 p-6 rounded-lg shadow-xl">
              <div className="mb-4 text-center text-sm font-medium text-gray-700 dark:text-gray-200">
                请完成安全验证
              </div>
              <div className="flex justify-center">
                <Turnstile
                  options={{
                    theme: (document.documentElement.classList.contains(
                      "dark",
                    ) ||
                    document.documentElement.getAttribute("data-theme") ===
                      "dark" ||
                    window.matchMedia("(prefers-color-scheme: dark)").matches
                      ? "dark"
                      : "light") as "light" | "dark" | "auto",
                  }}
                  siteKey={siteKey}
                  onError={() => {
                    toast.error("验证失败，请刷新重试");
                    setLoading(false);
                  }}
                  onExpire={() => {
                    setForm((prev) => ({ ...prev, captchaId: "" }));
                  }}
                  onSuccess={(token) => {
                    setForm((prev) => ({ ...prev, captchaId: token }));
                    void performLogin(token);
                  }}
                />
              </div>
            </div>
          </div>
        )}
      </section>
    </div>
  );
}