import { useCallback, useEffect, useState } from 'react'
import {
  Badge,
  Box,
  Button,
  Flex,
  Heading,
  Link,
  Spacer,
  Spinner,
  Table,
  TableContainer,
  Tbody,
  Td,
  Text,
  Th,
  Thead,
  Tr,
  useToast,
  Wrap,
} from '@chakra-ui/react'
import { useNavigate } from 'react-router-dom'
import { api, ApiError, type Project } from '../../lib/api'
import { formatDate, monthsLabel, projectStatusColor, projectStatusLabel, timeRemaining } from '../../lib/format'
import { ConfirmDialog } from '../../components/ConfirmDialog'
import { CreateProjectModal } from '../../components/CreateProjectModal'
import { ExtendProjectModal } from '../../components/ExtendProjectModal'

// Un déploiement en cours => on rafraîchit régulièrement.
const POLL_MS = 5000

// Projets vitrine déployés pour des clients sur abonnement de 1 à 12 mois.
export function Projects() {
  const toast = useToast()
  const navigate = useNavigate()
  const [projects, setProjects] = useState<Project[]>([])
  const [loading, setLoading] = useState(true)
  const [busy, setBusy] = useState<string | null>(null)
  const [createOpen, setCreateOpen] = useState(false)
  const [toExtend, setToExtend] = useState<Project | null>(null)
  const [toDelete, setToDelete] = useState<Project | null>(null)

  const load = useCallback(async () => {
    try {
      const res = await api.listProjects()
      setProjects((res.items ?? []).filter((p) => p.status !== 'deleted'))
    } catch (err) {
      if (err instanceof ApiError && err.status === 401) navigate('/admin/login')
      else toast({ status: 'error', title: 'Chargement des projets impossible' })
    } finally {
      setLoading(false)
    }
  }, [navigate, toast])

  useEffect(() => {
    void load()
    const id = setInterval(() => void load(), POLL_MS)
    return () => clearInterval(id)
  }, [load])

  const confirmDelete = async () => {
    if (!toDelete) return
    const p = toDelete
    setBusy(p.id)
    try {
      await api.deleteProject(p.id)
      toast({ status: 'success', title: 'Projet supprimé' })
      setToDelete(null)
      await load()
    } catch (err) {
      const msg = err instanceof ApiError ? err.message : 'Erreur'
      toast({ status: 'error', title: 'Suppression impossible', description: msg })
    } finally {
      setBusy(null)
    }
  }

  // Échéance affichée : date de suppression et temps restant.
  const deadline = (p: Project) => (
    <Text fontSize="sm">
      {formatDate(p.expires_at)} · {timeRemaining(p.expires_at)}
    </Text>
  )

  return (
    <Box p={{ base: 4, md: 8 }}>
      <Flex mb={6} align="center" gap={3}>
        <Heading size="md">Projets</Heading>
        <Spacer />
        <Button colorScheme="primary" onClick={() => setCreateOpen(true)}>
          Déployer un projet
        </Button>
      </Flex>

      {loading ? (
        <Spinner />
      ) : projects.length === 0 ? (
        <Text color="gray.500">Aucun projet déployé.</Text>
      ) : (
        <TableContainer>
          <Table size="sm">
            <Thead>
              <Tr>
                <Th>Client</Th>
                <Th>Statut</Th>
                <Th>Adresse</Th>
                <Th>Abonnement</Th>
                <Th>Échéance</Th>
                <Th>Admins</Th>
                <Th />
              </Tr>
            </Thead>
            <Tbody>
              {projects.map((p) => {
                const locked = busy === p.id
                const canExtend = p.status === 'ready' || p.status === 'provisioning'
                return (
                  <Tr key={p.id}>
                    <Td>{p.client_name}</Td>
                    <Td>
                      <Badge colorScheme={projectStatusColor(p.status)}>{projectStatusLabel(p.status)}</Badge>
                    </Td>
                    <Td>
                      <Link href={p.url} isExternal fontFamily="mono" fontSize="sm">
                        {p.host}
                      </Link>
                    </Td>
                    <Td>{monthsLabel(p.months_purchased)} au total</Td>
                    <Td>{deadline(p)}</Td>
                    <Td>
                      {p.admin_username} · max {p.admin_number}
                    </Td>
                    <Td>
                      <Wrap justify="flex-end" spacing={2}>
                        <Button size="xs" colorScheme="primary" isDisabled={!canExtend || locked} onClick={() => setToExtend(p)}>
                          Renouveler
                        </Button>
                        <Button
                          size="xs"
                          variant="outline"
                          colorScheme="red"
                          isDisabled={p.status === 'deleting' || locked}
                          onClick={() => setToDelete(p)}
                        >
                          Supprimer
                        </Button>
                      </Wrap>
                    </Td>
                  </Tr>
                )
              })}
            </Tbody>
          </Table>
        </TableContainer>
      )}

      <CreateProjectModal isOpen={createOpen} onClose={() => setCreateOpen(false)} onCreated={() => void load()} />
      <ExtendProjectModal project={toExtend} onClose={() => setToExtend(null)} onExtended={() => void load()} />
      <ConfirmDialog
        isOpen={!!toDelete}
        title="Supprimer le projet"
        confirmLabel="Supprimer définitivement"
        confirmColorScheme="red"
        isLoading={busy === toDelete?.id}
        onConfirm={() => void confirmDelete()}
        onClose={() => setToDelete(null)}
      >
        Le projet de {toDelete?.client_name} sera supprimé immédiatement, avec ses données et ses sauvegardes. Cette
        action est irréversible.
      </ConfirmDialog>
    </Box>
  )
}