import Box from '@mui/material/Box'
import Typography from '@mui/material/Typography'
import Paper from '@mui/material/Paper'
import Grid from '@mui/material/Grid2'
import PropTypes from 'prop-types'
import IconButton from '@mui/material/IconButton'
import ThumbUpIcon from '@mui/icons-material/ThumbUp'
import ThumbDownIcon from '@mui/icons-material/ThumbDown'
import {useState, useEffect} from 'react'
import {useSession} from 'next-auth/react'
import Snackbar from '@mui/material/Snackbar'
import Alert from '@mui/material/Alert'
import MarkdownRenderer from '../markdown-renderer/index.js'
import {handleVote, getUserVote} from '../../lib/directus.js'
import {formatDate} from '@/lib/format.js'

export default function VersionComparison({versionData, versionCompare}) {
  const {current, main, outdated} = versionCompare
  const {data: session} = useSession()
  const [snackbar, setSnackbar] = useState({open: false, message: '', severity: 'success'})
  const [currentVote, setCurrentVote] = useState(null)

  useEffect(() => {
    const fetchVote = async () => {
      if (session?.user && versionCompare.versionId) {
        try {
          const vote = await getUserVote({
            accessToken: session.user.accessToken,
            userId: session.user.userId,
            versionId: versionCompare.versionId
          })
          setCurrentVote(vote)
        } catch (error) {
          console.error('Error fetching vote:', error)
        }
      }
    }

    fetchVote()
  }, [session, versionCompare.versionId])

  const handleVoteClick = async voteValue => {
    try {
      const newVoteValue = await handleVote({
        accessToken: session.user.accessToken,
        userId: session.user.userId,
        versionId: versionCompare.versionId,
        voteValue
      })
      setCurrentVote(newVoteValue)
      setSnackbar({
        open: true,
        message: newVoteValue === null ? 'Vote annulé' : 'Vote enregistré avec succès',
        severity: 'success'
      })
    } catch (error) {
      setSnackbar({
        open: true,
        message: `Erreur lors du vote: ${error}`,
        severity: 'error'
      })
    }
  }

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

  const createdAt = new Date(versionData.date_created)
  const threeDaysAgo = new Date(Date.now() - (3 * 24 * 60 * 60 * 1000))
  const isVoteDisabled = createdAt < threeDaysAgo

  return (
    <Box sx={{padding: 3}}>
      <Grid container spacing={2} sx={{width: '100%'}}>
        <Grid xs={6} sx={{width: '100%'}}>
          <Paper sx={{
            padding: 2,
            backgroundColor: '#E8F5E9',
            width: '100%',
            minHeight: '200px'
          }}
          >
            <Box sx={{
              color: '#2E7D32',
              fontWeight: 'bold'
            }}
            >
              <MarkdownRenderer
                content={main.contenu}
                color='#2E7D32'
                fallbackComponent={({children, ...props}) => (
                  <Typography variant='body1' sx={{color: '#2E7D32', fontWeight: 'bold'}} {...props}>
                    {children}
                  </Typography>
                )}
              />
            </Box>
            <Box sx={{mt: 1}}>
              <Typography sx={{textDecoration: 'underline'}} variant='caption' color='success'>
                @{main.user_created?.split('-')[0] || 'Système'}
              </Typography>
            </Box>
          </Paper>
        </Grid>
        <Grid xs={6} sx={{width: '100%'}}>
          <Paper sx={{
            padding: 2,
            backgroundColor: outdated ? '#F9E8E8' : '#E3F2FD',
            width: '100%',
            minHeight: '200px'
          }}
          >
            <Box sx={{
              color: outdated ? '#D32F2F' : '#1976D2',
              fontWeight: 'bold'
            }}
            >
              <MarkdownRenderer
                content={current.contenu}
                color={outdated ? '#D32F2F' : '#1976D2'}
                fallbackComponent={({children, ...props}) => (
                  <Typography variant='body1' sx={{color: outdated ? '#D32F2F' : '#1976D2', fontWeight: 'bold'}} {...props}>
                    {children}
                  </Typography>
                )}
              />
            </Box>
            <Box sx={{mt: 1}}>
              <Typography sx={{textDecoration: 'underline'}} variant='caption' color='primary'>
                @{versionData.user_created?.split('-')[0] || 'Système'}
              </Typography>
            </Box>
            {!outdated && session?.user && (
              <Box sx={{
                display: 'flex', alignItems: 'center', justifyContent: 'space-between', mt: 1
              }}
              >
                <Box>
                  {versionData && (
                    <Typography sx={{fontWeight: 'bold'}} color={isVoteDisabled ? 'error' : 'primary'}>
                      {formatDate(versionData.date_created)}
                    </Typography>
                  )}
                </Box>
                <Box sx={{display: 'flex', justifyContent: 'flex-end'}}>
                  <IconButton
                    size='small'
                    color={currentVote === 1 ? 'success' : 'primary'}
                    aria-label='vote positif'
                    onClick={() => handleVoteClick(1)}
                  >
                    <ThumbUpIcon />
                  </IconButton>
                  <IconButton
                    size='small'
                    color={currentVote === -1 ? 'error' : 'primary'}
                    aria-label='vote négatif'
                    onClick={() => handleVoteClick(-1)}
                  >
                    <ThumbDownIcon />
                  </IconButton>
                </Box>
              </Box>
            )}
          </Paper>
        </Grid>
      </Grid>

      <Box sx={{marginTop: 4}}>
        <Typography variant='button' sx={{
          fontWeight: 'bold', marginBottom: 1, textAlign: 'center', display: 'block'
        }}
        >
          LÉGENDE
        </Typography>
        <Grid container textAlign='center' spacing={1}>
          <Grid size={{xs: 6, sm: 6}}>
            <Typography
              variant='body2'
              sx={{
                backgroundColor: '#E8F5E9',
                padding: 1,
                borderRadius: 1,
                color: '#2E7D32',
                fontWeight: 'bold'
              }}
            >
              Version de référence
            </Typography>
          </Grid>
          <Grid size={{xs: 6, sm: 6}}>
            <Typography
              variant='body2'
              sx={{
                backgroundColor: '#E3F2FD',
                padding: 1,
                borderRadius: 1,
                color: '#1976D2',
                fontWeight: 'bold'
              }}
            >
              En cours de révision
            </Typography>
          </Grid>
          <Grid size={{xs: 12, sm: 4}}>
            <Typography
              variant='body2'
              sx={{
                backgroundColor: '#F9E8E8',
                padding: 1,
                borderRadius: 1,
                color: '#D32F2F',
                fontWeight: 'bold'
              }}
            >
              Remplacée / Publiée
            </Typography>
          </Grid>
        </Grid>
      </Box>
      <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>
    </Box>
  )
}

VersionComparison.propTypes = {
  versionData: PropTypes.object,
  versionCompare: PropTypes.shape({
    outdated: PropTypes.bool.isRequired,
    mainHash: PropTypes.string.isRequired,
    current: PropTypes.object.isRequired,
    main: PropTypes.object.isRequired,
    versionId: PropTypes.string
  }).isRequired,
}