/**
 * Notifications Settings Page
 * Configure notification preferences and view notification history
 */

import { useState } from 'react';
import {
  ActionIcon,
  Alert,
  Badge,
  Button,
  Card,
  Container,
  Divider,
  Group,
  Loader,
  Menu,
  Paper,
  ScrollArea,
  Stack,
  Switch,
  Text,
  ThemeIcon,
  Title,
  Tooltip,
} from '@mantine/core';
import { notifications as mantineNotifications } from '@mantine/notifications';
import {
  IconBell,
  IconBellOff,
  IconAlertCircle,
  IconCheck,
  IconTrash,
  IconDots,
  IconRefresh,
  IconMail,
  IconBrandSlack,
  IconBrandDiscord,
  IconAlertTriangle,
  IconInfoCircle,
} from '@tabler/icons-react';
import { GetServerSidePropsContext } from 'next';

import { UnraidLayout } from '~/components/Unraid/Layout';
import { getServerAuthSession } from '~/server/auth';
import { getServerSideTranslations } from '~/tools/server/getServerSideTranslations';
import { checkForSessionOrAskForLogin } from '~/tools/server/loginBuilder';
import { api } from '~/utils/api';
import type { Notification, NotificationImportance } from '~/lib/unraid/types';

function getImportanceColor(importance: NotificationImportance): string {
  switch (importance) {
    case 'ALERT':
      return 'red';
    case 'WARNING':
      return 'yellow';
    case 'NORMAL':
      return 'blue';
    default:
      return 'gray';
  }
}

function getImportanceIcon(importance: NotificationImportance) {
  switch (importance) {
    case 'ALERT':
      return <IconAlertCircle size={14} />;
    case 'WARNING':
      return <IconAlertTriangle size={14} />;
    case 'NORMAL':
      return <IconInfoCircle size={14} />;
    default:
      return <IconBell size={14} />;
  }
}

function formatDate(timestamp: number): string {
  return new Date(timestamp * 1000).toLocaleDateString('en-US', {
    year: 'numeric',
    month: 'short',
    day: 'numeric',
    hour: '2-digit',
    minute: '2-digit',
  });
}

function NotificationItem({
  notification,
  onMarkRead,
  onDelete,
}: {
  notification: Notification;
  onMarkRead: () => void;
  onDelete: () => void;
}) {
  return (
    <Paper
      p="md"
      radius="md"
      withBorder
      style={{
        opacity: notification.read ? 0.7 : 1,
        borderLeftWidth: 3,
        borderLeftColor: `var(--mantine-color-${getImportanceColor(notification.importance)}-6)`,
      }}
    >
      <Group position="apart" noWrap>
        <Group spacing="sm" noWrap style={{ flex: 1 }}>
          <ThemeIcon
            size="md"
            variant="light"
            color={getImportanceColor(notification.importance)}
          >
            {getImportanceIcon(notification.importance)}
          </ThemeIcon>
          <div style={{ flex: 1, minWidth: 0 }}>
            <Group spacing="xs" noWrap>
              <Text weight={600} lineClamp={1}>
                {notification.subject}
              </Text>
              {!notification.read && (
                <Badge size="xs" color="blue" variant="filled">
                  New
                </Badge>
              )}
            </Group>
            <Text size="sm" color="dimmed" lineClamp={2}>
              {notification.description}
            </Text>
            <Group spacing="xs" mt="xs">
              <Badge size="xs" variant="outline">
                {notification.type}
              </Badge>
              <Text size="xs" color="dimmed">
                {formatDate(notification.timestamp)}
              </Text>
            </Group>
          </div>
        </Group>

        <Menu shadow="md" width={150} position="bottom-end">
          <Menu.Target>
            <ActionIcon variant="subtle">
              <IconDots size={16} />
            </ActionIcon>
          </Menu.Target>
          <Menu.Dropdown>
            {!notification.read && (
              <Menu.Item
                icon={<IconCheck size={14} />}
                onClick={onMarkRead}
              >
                Mark as Read
              </Menu.Item>
            )}
            <Menu.Item
              color="red"
              icon={<IconTrash size={14} />}
              onClick={onDelete}
            >
              Delete
            </Menu.Item>
          </Menu.Dropdown>
        </Menu>
      </Group>
    </Paper>
  );
}

export default function NotificationsSettingsPage() {
  const [filter, setFilter] = useState<'all' | 'unread'>('all');

  const {
    data: notificationsList,
    isLoading,
    error,
    refetch,
  } = api.unraid.notifications.useQuery();

  const markRead = api.unraid.markNotificationRead.useMutation({
    onSuccess: () => {
      mantineNotifications.show({
        title: 'Marked as Read',
        message: 'Notification marked as read',
        color: 'green',
        icon: <IconCheck size={16} />,
      });
      refetch();
    },
  });

  const deleteNotification = api.unraid.deleteNotification.useMutation({
    onSuccess: () => {
      mantineNotifications.show({
        title: 'Deleted',
        message: 'Notification deleted',
        color: 'green',
        icon: <IconCheck size={16} />,
      });
      refetch();
    },
  });

  const markAllRead = api.unraid.markAllNotificationsRead.useMutation({
    onSuccess: () => {
      mantineNotifications.show({
        title: 'All Read',
        message: 'All notifications marked as read',
        color: 'green',
        icon: <IconCheck size={16} />,
      });
      refetch();
    },
  });

  const filteredNotifications = notificationsList?.filter((n) =>
    filter === 'all' ? true : !n.read
  );

  const unreadCount = notificationsList?.filter((n) => !n.read).length || 0;
  const alertCount = notificationsList?.filter((n) => n.importance === 'ALERT').length || 0;
  const warningCount = notificationsList?.filter((n) => n.importance === 'WARNING').length || 0;

  if (isLoading) {
    return (
      <UnraidLayout>
        <Container size="lg" py="xl">
          <Stack align="center" spacing="md">
            <Loader size="xl" />
            <Text color="dimmed">Loading notifications...</Text>
          </Stack>
        </Container>
      </UnraidLayout>
    );
  }

  if (error) {
    return (
      <UnraidLayout>
        <Container size="lg" py="xl">
          <Alert icon={<IconAlertCircle size={16} />} title="Error" color="red">
            {error.message}
          </Alert>
        </Container>
      </UnraidLayout>
    );
  }

  return (
    <UnraidLayout>
      <Container size="lg" py="xl">
        <Stack spacing="xl">
          {/* Header */}
          <Group position="apart">
            <Group>
              <ThemeIcon size={48} radius="md" variant="light" color="yellow">
                <IconBell size={28} />
              </ThemeIcon>
              <div>
                <Title order={2}>Notifications</Title>
                <Text color="dimmed" size="sm">
                  {unreadCount} unread notification{unreadCount !== 1 ? 's' : ''}
                </Text>
              </div>
            </Group>

            <Group>
              {unreadCount > 0 && (
                <Button
                  variant="light"
                  leftIcon={<IconCheck size={16} />}
                  onClick={() => markAllRead.mutate()}
                  loading={markAllRead.isLoading}
                >
                  Mark All Read
                </Button>
              )}
              <Button
                variant="light"
                leftIcon={<IconRefresh size={16} />}
                onClick={() => refetch()}
              >
                Refresh
              </Button>
            </Group>
          </Group>

          {/* Stats */}
          <Group>
            <Card shadow="sm" radius="md" withBorder style={{ flex: 1 }}>
              <Text size="xs" color="dimmed" transform="uppercase" weight={600}>
                Unread
              </Text>
              <Text size="xl" weight={700} color="blue">
                {unreadCount}
              </Text>
            </Card>

            <Card shadow="sm" radius="md" withBorder style={{ flex: 1 }}>
              <Text size="xs" color="dimmed" transform="uppercase" weight={600}>
                Alerts
              </Text>
              <Text size="xl" weight={700} color="red">
                {alertCount}
              </Text>
            </Card>

            <Card shadow="sm" radius="md" withBorder style={{ flex: 1 }}>
              <Text size="xs" color="dimmed" transform="uppercase" weight={600}>
                Warnings
              </Text>
              <Text size="xl" weight={700} color="yellow">
                {warningCount}
              </Text>
            </Card>

            <Card shadow="sm" radius="md" withBorder style={{ flex: 1 }}>
              <Text size="xs" color="dimmed" transform="uppercase" weight={600}>
                Total
              </Text>
              <Text size="xl" weight={700}>
                {notificationsList?.length || 0}
              </Text>
            </Card>
          </Group>

          {/* Notification Settings (placeholder) */}
          <Card shadow="sm" radius="md" withBorder>
            <Title order={4} mb="md">
              Notification Channels
            </Title>

            <Stack spacing="md">
              <Group position="apart">
                <Group spacing="sm">
                  <ThemeIcon size="md" variant="light" color="blue">
                    <IconMail size={16} />
                  </ThemeIcon>
                  <div>
                    <Text weight={500}>Email Notifications</Text>
                    <Text size="xs" color="dimmed">
                      Send notifications via email
                    </Text>
                  </div>
                </Group>
                <Switch disabled />
              </Group>

              <Divider />

              <Group position="apart">
                <Group spacing="sm">
                  <ThemeIcon size="md" variant="light" color="grape">
                    <IconBrandSlack size={16} />
                  </ThemeIcon>
                  <div>
                    <Text weight={500}>Slack Notifications</Text>
                    <Text size="xs" color="dimmed">
                      Send notifications to Slack
                    </Text>
                  </div>
                </Group>
                <Switch disabled />
              </Group>

              <Divider />

              <Group position="apart">
                <Group spacing="sm">
                  <ThemeIcon size="md" variant="light" color="indigo">
                    <IconBrandDiscord size={16} />
                  </ThemeIcon>
                  <div>
                    <Text weight={500}>Discord Notifications</Text>
                    <Text size="xs" color="dimmed">
                      Send notifications to Discord
                    </Text>
                  </div>
                </Group>
                <Switch disabled />
              </Group>
            </Stack>
          </Card>

          {/* Filter */}
          <Group>
            <Button
              variant={filter === 'all' ? 'filled' : 'light'}
              onClick={() => setFilter('all')}
              size="sm"
            >
              All ({notificationsList?.length || 0})
            </Button>
            <Button
              variant={filter === 'unread' ? 'filled' : 'light'}
              onClick={() => setFilter('unread')}
              size="sm"
              color="blue"
            >
              Unread ({unreadCount})
            </Button>
          </Group>

          {/* Notifications List */}
          <Stack spacing="sm">
            {filteredNotifications?.map((notification) => (
              <NotificationItem
                key={notification.id}
                notification={notification}
                onMarkRead={() => markRead.mutate({ id: notification.id })}
                onDelete={() => deleteNotification.mutate({ id: notification.id })}
              />
            ))}

            {filteredNotifications?.length === 0 && (
              <Card shadow="sm" radius="md" withBorder p="xl">
                <Stack align="center" spacing="md">
                  <ThemeIcon size={48} variant="light" color="gray">
                    <IconBellOff size={24} />
                  </ThemeIcon>
                  <Text color="dimmed">
                    {filter === 'unread'
                      ? 'No unread notifications'
                      : 'No notifications'}
                  </Text>
                </Stack>
              </Card>
            )}
          </Stack>
        </Stack>
      </Container>
    </UnraidLayout>
  );
}

export const getServerSideProps = async (context: GetServerSidePropsContext) => {
  const session = await getServerAuthSession(context);
  const translations = await getServerSideTranslations(
    ['common'],
    context.locale,
    context.req,
    context.res
  );

  const result = checkForSessionOrAskForLogin(
    context,
    session,
    () => session?.user != undefined
  );
  if (result) {
    return result;
  }

  return {
    props: {
      ...translations,
    },
  };
};