import { useEffect, useState } from "react";
import { Alert, Button, Card, Form, Input, Typography } from "antd";
import { KeyRound } from "lucide-react";
import { useNavigate, useParams } from "react-router";
import { ApiError, authApi } from "../api";
import { useRuntime } from "../app/RuntimeProvider";

interface FormValues {
  password: string;
  confirm: string;
}

function readAndClearToken(activationId: string): string {
  const storageKey = `tiku-activation:${activationId}`;
  const fragment = new URLSearchParams(window.location.hash.replace(/^#/, ""));
  const fromUrl = fragment.get("token");
  if (fromUrl) sessionStorage.setItem(storageKey, fromUrl);
  if (window.location.hash)
    history.replaceState(
      null,
      "",
      window.location.pathname + window.location.search,
    );
  return fromUrl || sessionStorage.getItem(storageKey) || "";
}

const errorMessages: Record<string, string> = {
  activation_invalid: "建站密钥无效，请联系平台重新获取。",
  activation_expired: "建站密钥已经过期，请联系平台重新签发。",
  activation_consumed: "建站密钥已经使用，不能再次激活。",
  activation_password_invalid: "密码至少 8 位，并同时包含字母和数字。",
};

export default function ActivationPage() {
  const { activationId = "" } = useParams();
  const { runtime } = useRuntime();
  const navigate = useNavigate();
  const [token, setToken] = useState("");
  const [error, setError] = useState("");
  const [submitting, setSubmitting] = useState(false);

  useEffect(() => {
    setToken(readAndClearToken(activationId));
  }, [activationId]);

  const submit = async (values: FormValues) => {
    if (!token) {
      setError("链接中没有可用的建站密钥，请联系平台重新获取。");
      return;
    }
    setSubmitting(true);
    setError("");
    try {
      await authApi.completeOwnerActivation({
        activationId,
        token,
        newPassword: values.password,
      });
      sessionStorage.removeItem(`tiku-activation:${activationId}`);
      navigate("/manage/onboarding", { replace: true });
    } catch (reason) {
      const code = reason instanceof ApiError ? reason.code : "";
      setError(errorMessages[code] ?? "激活失败，请联系平台服务人员。");
    } finally {
      setSubmitting(false);
    }
  };

  return (
    <div className="min-h-screen grid place-items-center bg-slate-950 p-5">
      <Card
        className="w-full max-w-md shadow-2xl"
        styles={{ body: { padding: 32 } }}
      >
        <div className="mb-7 flex items-center gap-4">
          <div
            className="grid h-12 w-12 place-items-center rounded-2xl text-white"
            style={{ background: runtime?.theme.primaryColor }}
          >
            <KeyRound size={24} />
          </div>
          <div>
            <Typography.Text type="secondary">
              {runtime?.tenantName}
            </Typography.Text>
            <Typography.Title level={3} style={{ margin: 0 }}>
              激活管理员账号
            </Typography.Title>
          </div>
        </div>
        <Typography.Paragraph type="secondary">
          设置管理员密码后，将自动登录并进入建站向导。一次性密钥使用后立即失效。
        </Typography.Paragraph>
        {!token && (
          <Alert
            className="mb-5"
            type="warning"
            showIcon
            title="缺少建站密钥"
          />
        )}
        {error && (
          <Alert className="mb-5" type="error" showIcon title={error} />
        )}
        <Form layout="vertical" onFinish={submit} requiredMark={false}>
          <Form.Item
            name="password"
            label="管理员密码"
            rules={[
              { required: true },
              { min: 8 },
              {
                pattern: /^(?=.*[A-Za-z])(?=.*\d).+$/,
                message: "必须同时包含字母和数字",
              },
            ]}
          >
            <Input.Password autoComplete="new-password" size="large" />
          </Form.Item>
          <Form.Item
            name="confirm"
            label="确认密码"
            dependencies={["password"]}
            rules={[
              { required: true },
              ({ getFieldValue }) => ({
                validator: (_, value) =>
                  value === getFieldValue("password")
                    ? Promise.resolve()
                    : Promise.reject(new Error("两次密码不一致")),
              }),
            ]}
          >
            <Input.Password autoComplete="new-password" size="large" />
          </Form.Item>
          <Button
            block
            size="large"
            type="primary"
            htmlType="submit"
            loading={submitting}
          >
            激活并开始建站
          </Button>
        </Form>
      </Card>
    </div>
  );
}