import {useRef, useState} from 'react'
import {useTheme} from '@mui/material/styles'
import PropTypes from 'prop-types'
import Box from '@mui/material/Box'
import Typography from '@mui/material/Typography'
import Card from '@mui/material/Card'
import CardContent from '@mui/material/CardContent'
import CardActions from '@mui/material/CardActions'
import Button from '@mui/material/Button'
import Chip from '@mui/material/Chip'
import Avatar from '@mui/material/Avatar'
import Divider from '@mui/material/Divider'
import Timeline from '@mui/lab/Timeline'
import TimelineItem from '@mui/lab/TimelineItem'
import TimelineSeparator from '@mui/lab/TimelineSeparator'
import TimelineConnector from '@mui/lab/TimelineConnector'
import TimelineContent from '@mui/lab/TimelineContent'
import TimelineDot from '@mui/lab/TimelineDot'
import TimelineOppositeContent from '@mui/lab/TimelineOppositeContent'
import AccessTimeIcon from '@mui/icons-material/AccessTime'
import CheckCircleIcon from '@mui/icons-material/CheckCircle'
import ErrorIcon from '@mui/icons-material/Error'
import EditIcon from '@mui/icons-material/Edit'
import Snackbar from '@mui/material/Snackbar'
import Alert from '@mui/material/Alert'
import SessionExpired from '../session/session-expired.js'
import MarkdownRenderer from '../markdown-renderer/index.js'
import VersionDialog from './version-dialog.js'
import VoteButtons from './vote-buttons.js'
import CopyButton from './copy-button.js'
import ShareButton from './share-button.js'
import ExportPdfButton from './export-pdf-button.js'
import PrintButton from './print-button.js'
import {formatDate} from '@/lib/format.js'
import {compareVersion} from '@/lib/directus.js'

function getVersionStatus(version, index, totalVersions) {
  // Logic to determine version status based on position and data
  if (index === 0) {
    return 'current' // Most recent
  }

  if (index === totalVersions - 1) {
    return 'initial' // First version
  }

  return 'archived' // Intermediate versions
}

function getStatusConfig(status) {
  switch (status) {
    case 'current': {
      return {
        color: '#1976D2',
        bgColor: '#E3F2FD',
        icon: <EditIcon />,
        label: 'En cours',
        chipColor: 'primary'
      }
    }

    case 'published': {
      return {
        color: '#2E7D32',
        bgColor: '#E8F5E9',
        icon: <CheckCircleIcon />,
        label: 'Publié',
        chipColor: 'success'
      }
    }

    case 'archived': {
      return {
        color: '#757575',
        bgColor: '#F5F5F5',
        icon: <AccessTimeIcon />,
        label: 'Archivé',
        chipColor: 'default'
      }
    }

    case 'outdated': {
      return {
        color: '#D32F2F',
        bgColor: '#F9E8E8',
        icon: <ErrorIcon />,
        label: 'Obsolète',
        chipColor: 'error'
      }
    }

    default: {
      return {
        color: '#757575',
        bgColor: '#F5F5F5',
        icon: <AccessTimeIcon />,
        label: 'Archivé',
        chipColor: 'default'
      }
    }
  }
}

function VersionCard({
  version,
  index,
  totalVersions,
  accessToken,
  userId,
  countdownRef,
  setError,
  setIsErrorAlertOpen,
  setIsOpenComparison,
  setVersionCompare,
  onVoteResult
}) {
  const theme = useTheme()
  const status = getVersionStatus(version, index, totalVersions)

  const statusConfig = getStatusConfig(status)
  const userDisplayName = version.user_created?.split('-')[0] || 'Système'

  // Check if voting is disabled (after 3 days)
  const createdAt = new Date(version.date_created)
  const threeDaysAgo = new Date(Date.now() - (3 * 24 * 60 * 60 * 1000))
  const isVoteDisabled = createdAt < threeDaysAgo

  const handleCompareClick = async () => {
    const comparisonData = await compareVersion({
      accessToken,
      userId,
      versionId: version.id,
      countdownRef,
      setError,
      setIsErrorAlertOpen
    })

    if (comparisonData) {
      setVersionCompare({...comparisonData, versionId: version.id})
      setIsOpenComparison(true)
    }
  }

  // Create content preview preserving markdown structure
  const createContentPreview = content => {
    if (!content) {
      return 'Contenu non disponible'
    }

    // If content is short enough, return as is
    if (content.length <= 150) {
      return content
    }

    // Find a good breaking point (end of sentence, paragraph, or word)
    const preview = content.slice(0, 150)
    const lastSentence = Math.max(preview.lastIndexOf('.'), preview.lastIndexOf('!'), preview.lastIndexOf('?'))
    const lastParagraph = preview.lastIndexOf('\n\n')
    const lastWord = preview.lastIndexOf(' ')

    // Choose the best breaking point
    let breakPoint = 150
    if (lastSentence > 100) {
      breakPoint = lastSentence + 1
    } else if (lastParagraph > 80) {
      breakPoint = lastParagraph
    } else if (lastWord > 100) {
      breakPoint = lastWord
    }

    return content.slice(0, breakPoint) + (content.length > breakPoint ? '...' : '')
  }

  const contentPreview = createContentPreview(version?.delta?.contenu)

  return (
    <Card
      sx={{
        borderLeft: `4px solid ${statusConfig.color}`,
        backgroundColor: statusConfig.bgColor,
        mb: 2,
        transition: 'all 0.2s ease-in-out',
        '&:hover': {
          transform: 'translateY(-2px)',
          boxShadow: 3
        }
      }}
    >
      <CardContent>
        <Box sx={{
          display: 'flex',
          justifyContent: 'space-between',
          alignItems: 'flex-start',
          mb: 2
        }}
        >
          <Box sx={{display: 'flex', alignItems: 'center', gap: 1}}>
            <Avatar sx={{bgcolor: statusConfig.color, width: 32, height: 32}}>
              {statusConfig.icon}
            </Avatar>
            <Box>
              <Typography variant='h6' sx={{fontWeight: 'bold', color: statusConfig.color}}>
                {version.name}
              </Typography>
              <Typography variant='caption' color='text.secondary'>
                par @{userDisplayName}
              </Typography>
            </Box>
          </Box>
          <Box sx={{display: 'flex', gap: 1}}>
            <Chip
              label={statusConfig.label}
              color={statusConfig.chipColor}
              size='small'
              variant='outlined'
            />
            {isVoteDisabled && (
              <Chip
                label='Vote fermé'
                color='error'
                size='small'
                variant='outlined'
              />
            )}
          </Box>
        </Box>

        <Box sx={{mb: 2, '& > div': {fontSize: '0.875rem', fontStyle: 'italic'}}}>
          <MarkdownRenderer
            content={contentPreview}
            color={theme.palette.text.secondary}
            fallbackComponent={({children, ...props}) => (
              <Typography
                variant='body2'
                color='text.secondary'
                sx={{fontStyle: 'italic'}}
                {...props}
              >
                {children}
              </Typography>
            )}
          />
        </Box>

        <Box sx={{display: 'flex', justifyContent: 'space-between', alignItems: 'center'}}>
          <Typography variant='caption' color='text.secondary'>
            {formatDate(version.date_created, 'PPpp')}
          </Typography>

          <Box sx={{display: 'flex', alignItems: 'center', gap: 1}}>
            <CopyButton
              content={version.delta?.contenu || version.name || ''}
              label='Copier le contenu de cette version'
              hasSnackbarVisible={false}
            />
            <ShareButton
              versionId={version.id}
              versionName={version.name}
              hasSnackbarVisible={false}
            />
            <ExportPdfButton
              versionData={version}
              size='small'
              variant='text'
            />
            <PrintButton
              versionData={version}
              size='small'
              variant='text'
            />
            <VoteButtons
              hasCountsVisible
              versionId={version.id}
              isDisabled={isVoteDisabled}
              onVoteResult={onVoteResult}
            />
          </Box>
        </Box>
      </CardContent>

      <Divider />
      <CardActions sx={{justifyContent: 'flex-end'}}>
        <Button
          size='small'
          variant='outlined'
          color='primary'
          onClick={handleCompareClick}
        >
          Comparer
        </Button>
      </CardActions>
    </Card>
  )
}

export default function VersionTimeline({
  collection,
  data,
  accessToken,
  userId,
  setError,
  setIsErrorAlertOpen
}) {
  const countdownRef = useRef()
  const [isOpenComparison, setIsOpenComparison] = useState(false)
  const [versionCompare, setVersionCompare] = useState(null)
  const [snackbar, setSnackbar] = useState({open: false, message: '', severity: 'success'})

  const versionData = data.find(({id}) => id === versionCompare?.versionId)

  const handleVoteResult = result => {
    setSnackbar({
      open: true,
      message: result.message,
      severity: result.success ? 'success' : 'error'
    })
  }

  const handleCloseSnackbar = () => {
    setSnackbar(prev => ({...prev, open: false}))
  }

  return (
    <>
      <Box>
        <Typography variant='h5' textAlign='center' sx={{mb: 3, fontWeight: 'bold'}}>
          Historique des versions - {collection}
        </Typography>

        <Timeline position='right'>
          {data.map((version, index) => (
            <TimelineItem key={version.id}>
              <TimelineOppositeContent sx={{flex: 0.3, pr: 2}}>
                <Typography variant='caption' color='text.secondary'>
                  {formatDate(version.date_created, 'dd/MM/yyyy')}
                </Typography>
                <br />
                <Typography variant='caption' color='text.secondary'>
                  {formatDate(version.date_created, 'HH:mm')}
                </Typography>
              </TimelineOppositeContent>

              <TimelineSeparator>
                <TimelineDot
                  color={index === 0 ? 'primary' : 'grey'}
                  variant={index === 0 ? 'filled' : 'outlined'}
                >
                  {index === 0 ? <EditIcon /> : <AccessTimeIcon />}
                </TimelineDot>
                {index < data.length - 1 && <TimelineConnector />}
              </TimelineSeparator>

              <TimelineContent sx={{flex: 1}}>
                <VersionCard
                  version={version}
                  index={index}
                  totalVersions={data.length}
                  accessToken={accessToken}
                  userId={userId}
                  countdownRef={countdownRef}
                  setError={setError}
                  setIsErrorAlertOpen={setIsErrorAlertOpen}
                  setIsOpenComparison={setIsOpenComparison}
                  setVersionCompare={setVersionCompare}
                  onVoteResult={handleVoteResult}
                />
              </TimelineContent>
            </TimelineItem>
          ))}
        </Timeline>
      </Box>

      {isOpenComparison && (
        <VersionDialog
          versionData={versionData}
          versionCompare={versionCompare}
          isOpen={isOpenComparison}
          setIsOpen={setIsOpenComparison}
        />
      )}

      <SessionExpired
        ref={countdownRef}
        setError={setError}
        setIsErrorAlertOpen={setIsErrorAlertOpen}
      />

      <Snackbar
        open={snackbar.open}
        autoHideDuration={6000}
        anchorOrigin={{vertical: 'bottom', horizontal: 'center'}}
        onClose={handleCloseSnackbar}
      >
        <Alert variant='filled' severity={snackbar.severity} sx={{width: '100%'}} onClose={handleCloseSnackbar}>
          {snackbar.message}
        </Alert>
      </Snackbar>
    </>
  )
}

VersionTimeline.propTypes = {
  collection: PropTypes.oneOf(['titres', 'articles']).isRequired,
  data: PropTypes.array.isRequired,
  accessToken: PropTypes.string.isRequired,
  userId: PropTypes.string.isRequired,
  setError: PropTypes.func.isRequired,
  setIsErrorAlertOpen: PropTypes.func.isRequired
}

VersionCard.propTypes = {
  version: PropTypes.object.isRequired,
  index: PropTypes.number.isRequired,
  totalVersions: PropTypes.number.isRequired,
  accessToken: PropTypes.string.isRequired,
  userId: PropTypes.string.isRequired,
  countdownRef: PropTypes.object.isRequired,
  setError: PropTypes.func.isRequired,
  setIsErrorAlertOpen: PropTypes.func.isRequired,
  setIsOpenComparison: PropTypes.func.isRequired,
  setVersionCompare: PropTypes.func.isRequired,
  onVoteResult: PropTypes.func.isRequired
}