import React, { useState, useEffect } from "react";
import { Card, Text, Grid, Button } from "@tremor/react";
import { Typography, message, Divider, Spin, Checkbox } from "antd";
import { getEmailEventSettings, updateEmailEventSettings, resetEmailEventSettings } from "../networking";
import { EmailEvent } from "../../types";
import { EmailEventSetting } from "./types";

const { Title } = Typography;

interface EmailEventSettingsProps {
  accessToken: string | null;
}

const EmailEventSettings: React.FC<EmailEventSettingsProps> = ({
  accessToken,
}) => {
  const [loading, setLoading] = useState(true);
  const [eventSettings, setEventSettings] = useState<EmailEventSetting[]>([]);

  // Fetch email event settings on component mount
  useEffect(() => {
    fetchEventSettings();
  }, [accessToken]);

  const fetchEventSettings = async () => {
    if (!accessToken) return;

    setLoading(true);
    try {
      const response = await getEmailEventSettings(accessToken);
      setEventSettings(response.settings);
    } catch (error) {
      console.error("Failed to fetch email event settings:", error);
      message.error("Failed to fetch email event settings");
    } finally {
      setLoading(false);
    }
  };

  const handleCheckboxChange = (event: EmailEvent, checked: boolean) => {
    const updatedSettings = eventSettings.map(setting => 
      setting.event === event ? { ...setting, enabled: checked } : setting
    );
    setEventSettings(updatedSettings);
  };

  const handleSaveSettings = async () => {
    if (!accessToken) return;

    try {
      await updateEmailEventSettings(accessToken, { settings: eventSettings });
      message.success("Email event settings updated successfully");
    } catch (error) {
      console.error("Failed to update email event settings:", error);
      message.error("Failed to update email event settings");
    }
  };

  const handleResetSettings = async () => {
    if (!accessToken) return;

    try {
      await resetEmailEventSettings(accessToken);
      message.success("Email event settings reset to defaults");
      // Refresh settings after reset
      fetchEventSettings();
    } catch (error) {
      console.error("Failed to reset email event settings:", error);
      message.error("Failed to reset email event settings");
    }
  };

  // Helper function to get a description for each event type
  const getEventDescription = (event: EmailEvent): string => {
    // Convert event name to a sentence with more context
    if (event.includes("Virtual Key Created")) {
      return "An email will be sent to the user when a new virtual key is created with their user ID";
    } else if (event.includes("New User Invitation")) {
      return "An email will be sent to the email address of the user when a new user is created";
    } else {
      // Handle any other event type from the API
      const words = event.split(/(?=[A-Z])/).join(' ').toLowerCase();
      return `Receive an email notification when ${words}`;
    }
  };

  return (
    <Card>
      <Title level={4}>Email Notifications</Title>
      <Text>
        Select which events should trigger email notifications.
      </Text>
      <Divider />

      {loading ? (
        <div style={{ textAlign: 'center', padding: '20px' }}>
          <Spin size="large" />
        </div>
      ) : (
        <div className="space-y-4">
          {eventSettings.map((setting) => (
            <div key={setting.event} className="flex items-center">
              <Checkbox 
                checked={setting.enabled}
                onChange={(e) => handleCheckboxChange(setting.event, e.target.checked)}
              />
              <div className="ml-3">
                <Text>{setting.event}</Text>
                <div className="text-sm text-gray-500 block">
                  {getEventDescription(setting.event)}
                </div>
              </div>
            </div>
          ))}
        </div>
      )}

      <div className="mt-6 flex space-x-4">
        <Button
          onClick={handleSaveSettings}
          disabled={loading}
        >
          Save Changes
        </Button>
        <Button
          onClick={handleResetSettings}
          variant="secondary"
          disabled={loading}
        >
          Reset to Defaults
        </Button>
      </div>
    </Card>
  );
};

export default EmailEventSettings;