import { createFileRoute } from '@tanstack/react-router'
import {
  Title,
  Text,
  Card,
  Stack,
  Badge,
  Group,
  Loader,
  Center,
  SimpleGrid,
  ThemeIcon,
} from '@pikku/mantine/core'
import { MapPin, Clock, CheckSquare, Smile } from 'lucide-react'
import { usePikkuQuery } from '@perauset/functions-sdk/pikku/api.gen'
import { TaskActions } from '@/components/task-actions'
import { m, mKey } from '@/i18n/messages'
import { useLocale } from '@/i18n/config'
import { asI18n, type I18nNode } from '@pikku/react'

export const Route = createFileRoute('/_authenticated/my/tasks')({
  component: MyTasksPage,
})

const STATUS_CONFIG: Record<string, { labelKey: string; color: string }> = {
  in_progress: { labelKey: 'my.tasks_in_progress', color: 'orange' },
  assigned: { labelKey: 'my.tasks_assigned', color: 'blue' },
  open: { labelKey: 'my.tasks_open', color: 'teal' },
  blocked: { labelKey: 'my.tasks_blocked', color: 'red' },
}

const CATEGORY_COLORS: Record<string, string> = {
  housekeeping: 'pink',
  kitchen: 'yellow',
  maintenance: 'orange',
  operations: 'blue',
  retreat: 'violet',
  transport: 'cyan',
}

const DISPLAY_STATUSES = ['in_progress', 'assigned', 'open', 'blocked']

interface TaskItem {
  taskId: string
  templateId: string | null
  title: string
  description: string | null
  category: string
  status: string
  location: string | null
  scheduledStartAt: string | Date | null
  scheduledEndAt: string | Date | null
  createdByUserId: string
}

function formatTime(val: string | Date | null): string | null {
  if (!val) return null
  const d = typeof val === 'string' ? new Date(val) : val
  return d.toLocaleDateString('en-US', {
    month: 'short',
    day: 'numeric',
    hour: 'numeric',
    minute: '2-digit',
  })
}

const cardStyle = {
  backgroundColor: '#ffffff',
  boxShadow: '0 2px 12px rgba(61, 43, 31, 0.08), 0 1px 4px rgba(61, 43, 31, 0.04)',
  maxWidth: 'calc(40rem * var(--mantine-scale))',
}

function TaskCard({ task }: { task: TaskItem }) {
  const cfg = STATUS_CONFIG[task.status]

  return (
    <Card padding="lg" radius="md" style={cardStyle}>
      <Stack gap="sm">
        <Group justify="space-between" align="flex-start" wrap="nowrap">
          <Text
            fw={600}
            lineClamp={2}
            style={{ fontFamily: '"Cormorant", serif', fontSize: 18, color: '#3D2B1F' }}
          >
            {asI18n(task.title)}
          </Text>
          <Badge size="sm" color={cfg?.color ?? 'gray'} variant="light" style={{ flexShrink: 0 }}>
            {cfg ? mKey(cfg.labelKey) : asI18n(task.status)}
          </Badge>
        </Group>

        <Group gap="xs">
          <Badge size="sm" variant="dot" color={CATEGORY_COLORS[task.category] ?? 'gray'}>
            {asI18n(task.category)}
          </Badge>
        </Group>

        {task.description && (
          <Text size="sm" c="dimmed" lineClamp={2}>
            {asI18n(task.description)}
          </Text>
        )}

        {task.location && (
          <Group gap={6}>
            <ThemeIcon size="sm" variant="transparent" color="gray">
              <MapPin size={14} />
            </ThemeIcon>
            <Text size="sm" c="dimmed">
              {asI18n(task.location)}
            </Text>
          </Group>
        )}

        {task.scheduledStartAt && (
          <Group gap={6}>
            <ThemeIcon size="sm" variant="transparent" color="gray">
              <Clock size={14} />
            </ThemeIcon>
            <Text size="sm" c="dimmed">
              {asI18n(
                `${formatTime(task.scheduledStartAt)}${
                  task.scheduledEndAt ? ` – ${formatTime(task.scheduledEndAt)}` : ''
                }`,
              )}
            </Text>
          </Group>
        )}

        <TaskActions taskId={task.taskId} status={task.status} />
      </Stack>
    </Card>
  )
}

function EmptyState({ message }: { message: I18nNode }) {
  return (
    <Card padding="xl" radius="md" style={{ ...cardStyle, textAlign: 'center' as const }}>
      <Stack align="center" gap="sm">
        <ThemeIcon size={48} variant="light" color="gray" radius="xl">
          <Smile size={24} />
        </ThemeIcon>
        <Text c="dimmed" size="sm">
          {message}
        </Text>
      </Stack>
    </Card>
  )
}

function MyTasksPage() {
  useLocale()
  const { data, isLoading } = usePikkuQuery('listTasks', { limit: 50, offset: 0 })

  const tasks = (data?.items ?? []) as TaskItem[]

  if (isLoading) {
    return (
      <Center py="xl">
        <Loader color="teal" />
      </Center>
    )
  }

  const grouped: Record<string, TaskItem[]> = {}
  for (const status of DISPLAY_STATUSES) {
    grouped[status] = []
  }
  for (const task of tasks) {
    if (DISPLAY_STATUSES.includes(task.status)) {
      grouped[task.status]!.push(task)
    }
  }

  const hasActiveTasks = DISPLAY_STATUSES.some((s) => (grouped[s]?.length ?? 0) > 0)

  return (
    <Stack gap="lg">
      <div>
        <Title order={2} style={{ fontFamily: '"Cormorant", serif', color: '#3D2B1F' }}>
          {m.my_tasks_title()}
        </Title>
        <Text size="sm" c="dimmed" mt={4}>
          {m.my_tasks_description()}
        </Text>
      </div>

      {!hasActiveTasks ? (
        <EmptyState message={m.my_no_active_tasks()} />
      ) : (
        DISPLAY_STATUSES.map((status) => {
          const items = grouped[status]!
          if (items.length === 0) return null
          const cfg = STATUS_CONFIG[status]!

          return (
            <div key={status}>
              <Group gap="xs" mb="md">
                <ThemeIcon size="md" variant="light" color={cfg.color} radius="xl">
                  <CheckSquare size={16} />
                </ThemeIcon>
                <Title order={4} style={{ fontFamily: '"Cormorant", serif', color: '#3D2B1F' }}>
                  {mKey(cfg.labelKey)}
                </Title>
                <Badge size="sm" color={cfg.color} variant="light">
                  {items.length}
                </Badge>
              </Group>
              <SimpleGrid cols={{ base: 1, sm: 2, lg: 3 }} spacing="md">
                {items.map((task) => (
                  <TaskCard key={task.taskId} task={task} />
                ))}
              </SimpleGrid>
            </div>
          )
        })
      )}
    </Stack>
  )
}