'use client'
import {
  Container,
  Card,
  CardContent,
  Typography,
  Box,
  TextField,
  Button,
  Paper,
  Avatar,
  Chip,
  IconButton,
  Dialog,
  DialogTitle,
  DialogContent,
  DialogActions,
  List,
  ListItem,
  ListItemAvatar,
  ListItemText,
  MenuItem,
  useTheme,
  CircularProgress,
  Skeleton,
  Alert,
  Tabs,
  Tab,
  FormControlLabel,
  Switch,
} from '@mui/material'
import {
  Favorite,
  Add,
  Close,
  Person,
  AccessTime,
  FavoriteBorder,
  Share,
  MoreVert,
  AutoAwesome,
  Edit,
  Login,
} from '@mui/icons-material'
import { useState, useEffect } from 'react'
import { useTranslations, useLocale, useFormatter } from 'next-intl'
import { useAuth } from '@/hooks/use-auth'

interface PrayerRequest {
  id: string
  title: string
  description: string
  category: string
  author: string
  timestamp: Date
  prayerCount: number
  isPrayedFor: boolean
}

export default function PrayersPage() {
  const theme = useTheme()
  const locale = useLocale()
  const t = useTranslations('pages.prayers')
  const tc = useTranslations('common')
  const f = useFormatter()
  const { user } = useAuth()
  const [prayers, setPrayers] = useState<PrayerRequest[]>([])
  const [selectedCategory, setSelectedCategory] = useState<string>('all')
  const [openDialog, setOpenDialog] = useState(false)
  const [tabValue, setTabValue] = useState(0) // 0 = Write, 1 = AI Generate
  const [newPrayer, setNewPrayer] = useState({
    title: '',
    description: '',
    category: 'personal',
  })
  const [aiPrompt, setAiPrompt] = useState('')
  const [isGenerating, setIsGenerating] = useState(false)
  const [loading, setLoading] = useState(true)

  const categories = [
    { value: 'personal', label: t('categories.personal'), color: 'primary' },
    { value: 'family', label: t('categories.family'), color: 'secondary' },
    { value: 'health', label: t('categories.health'), color: 'error' },
    { value: 'work', label: t('categories.work'), color: 'warning' },
    { value: 'ministry', label: t('categories.ministry'), color: 'success' },
    { value: 'world', label: t('categories.world'), color: 'info' },
  ]

  // Fetch prayers from API
  const fetchPrayers = async () => {
    setLoading(true)
    try {
      const params = new URLSearchParams()
      if (selectedCategory !== 'all') {
        params.append('category', selectedCategory)
      }
      params.append('limit', '50')
      if (user?.id) {
        params.append('userId', user.id)
      }

      const response = await fetch(`/api/prayers?${params.toString()}`)
      if (response.ok) {
        const data = await response.json()
        setPrayers(data.prayers.map((prayer: any) => ({
          ...prayer,
          timestamp: new Date(prayer.timestamp)
        })))
      } else {
        console.error('Failed to fetch prayers')
      }
    } catch (error) {
      console.error('Error fetching prayers:', error)
    } finally {
      setLoading(false)
    }
  }

  useEffect(() => {
    fetchPrayers()
  }, [selectedCategory, user])

  const handleGenerateAIPrayer = async () => {
    if (!aiPrompt.trim()) return
    if (!user) return

    setIsGenerating(true)
    try {
      const response = await fetch('/api/prayers/generate', {
        method: 'POST',
        headers: {
          'Content-Type': 'application/json',
          'Authorization': `Bearer ${localStorage.getItem('authToken')}`
        },
        body: JSON.stringify({
          prompt: aiPrompt,
          category: newPrayer.category,
          locale
        }),
      })

      if (response.ok) {
        const data = await response.json()
        setNewPrayer({
          title: data.title || '',
          description: data.prayer || '',
          category: newPrayer.category
        })
        setTabValue(0) // Switch to write tab to review generated prayer
      } else {
        console.error('Failed to generate prayer')
      }
    } catch (error) {
      console.error('Error generating prayer:', error)
    } finally {
      setIsGenerating(false)
    }
  }

  const handleSubmitPrayer = async () => {
    if (!newPrayer.title.trim() || !newPrayer.description.trim()) return
    if (!user) return

    const prayer: PrayerRequest = {
      id: Date.now().toString(),
      title: newPrayer.title,
      description: newPrayer.description,
      category: newPrayer.category,
      author: user.name || (locale === 'en' ? 'You' : 'Tu'),
      timestamp: new Date(),
      prayerCount: 0,
      isPrayedFor: false,
    }

    try {
      const response = await fetch('/api/prayers', {
        method: 'POST',
        headers: {
          'Content-Type': 'application/json',
          'Authorization': `Bearer ${localStorage.getItem('authToken')}`
        },
        body: JSON.stringify({
          title: newPrayer.title,
          description: newPrayer.description,
          category: newPrayer.category,
          isAnonymous: false
        }),
      })

      if (response.ok) {
        const data = await response.json()
        setPrayers([{
          ...data.prayer,
          timestamp: new Date(data.prayer.timestamp)
        }, ...prayers])
        setNewPrayer({ title: '', description: '', category: 'personal' })
        setAiPrompt('')
        setTabValue(0)
        setOpenDialog(false)
      } else {
        console.error('Failed to submit prayer')
      }
    } catch (error) {
      console.error('Error submitting prayer:', error)
    }
  }

  const handleOpenDialog = () => {
    if (!user) {
      // Could redirect to login or show login modal
      return
    }
    setOpenDialog(true)
  }

  const handlePrayFor = async (prayerId: string) => {
    try {
      const headers: HeadersInit = {
        'Content-Type': 'application/json'
      }

      const authToken = localStorage.getItem('authToken')
      if (authToken) {
        headers['Authorization'] = `Bearer ${authToken}`
      }

      const response = await fetch(`/api/prayers/${prayerId}/pray`, {
        method: 'POST',
        headers
      })

      if (response.ok) {
        const data = await response.json()
        setPrayers(prayers.map(prayer =>
          prayer.id === prayerId
            ? { ...prayer, prayerCount: data.prayerCount || prayer.prayerCount + 1, isPrayedFor: true }
            : prayer
        ))
      } else {
        console.error('Failed to update prayer count')
      }
    } catch (error) {
      console.error('Error updating prayer count:', error)
    }
  }

  const getCategoryInfo = (category: string) => {
    return categories.find(cat => cat.value === category) || categories[0]
  }

  const formatTimestamp = (timestamp: Date) => {
    const currentTime = new Date()

    try {
      // Use the correct API: relativeTime(date, now)
      return f.relativeTime(timestamp, currentTime)
    } catch (e) {
      // Fallback to simple formatting if relativeTime fails
      const diff = currentTime.getTime() - timestamp.getTime()
      const minutes = Math.floor(diff / (1000 * 60))
      const hours = Math.floor(minutes / 60)
      const days = Math.floor(hours / 24)

      if (days > 0) return locale === 'ro' ? `acum ${days} ${days === 1 ? 'zi' : 'zile'}` : `${days} ${days === 1 ? 'day' : 'days'} ago`
      if (hours > 0) return locale === 'ro' ? `acum ${hours} ${hours === 1 ? 'oră' : 'ore'}` : `${hours} ${hours === 1 ? 'hour' : 'hours'} ago`
      if (minutes > 0) return locale === 'ro' ? `acum ${minutes} ${minutes === 1 ? 'minut' : 'minute'}` : `${minutes} ${minutes === 1 ? 'minute' : 'minutes'} ago`
      return locale === 'ro' ? 'acum' : 'just now'
    }
  }

  return (
    <Box>

      <Container maxWidth="lg" sx={{ py: 4 }}>
        {/* Header */}
        <Box sx={{ mb: 4, textAlign: 'center' }}>
          <Typography variant="h3" component="h1" gutterBottom>
            <Favorite sx={{ fontSize: 40, mr: 2, verticalAlign: 'middle', color: 'error.main' }} />
            {t('title')}
          </Typography>
          <Typography variant="body1" color="text.secondary">
            {t('subtitle')}
          </Typography>
        </Box>

        <Box sx={{ display: 'flex', gap: 4, flexDirection: { xs: 'column', md: 'row' } }}>
          {/* Categories Filter */}
          <Box sx={{ width: { xs: '100%', md: '25%' }, flexShrink: 0 }}>
            <Card>
              <CardContent>
                {/* Add Prayer Button */}
                {user ? (
                  <Button
                    fullWidth
                    variant="contained"
                    color="primary"
                    startIcon={<Add />}
                    onClick={handleOpenDialog}
                    sx={{ mb: 3 }}
                  >
                    {t('dialog.title')}
                  </Button>
                ) : (
                  <Button
                    fullWidth
                    variant="contained"
                    color="primary"
                    startIcon={<Login />}
                    onClick={() => {
                      // Could redirect to login page or show login modal
                      console.log('Please login to add prayers')
                    }}
                    sx={{ mb: 3 }}
                  >
                    {locale === 'en' ? 'Login to Add Prayer' : 'Conectează-te pentru a adăuga'}
                  </Button>
                )}

                <Typography variant="h6" gutterBottom>
                  {t('categories.title')}
                </Typography>
                <Box sx={{ display: 'flex', flexDirection: 'column', gap: 1 }}>
                  <Chip
                    label={t('categories.all')}
                    color="default"
                    variant={selectedCategory === 'all' ? 'filled' : 'outlined'}
                    size="small"
                    onClick={() => setSelectedCategory('all')}
                    sx={{ justifyContent: 'flex-start', cursor: 'pointer' }}
                  />
                  {categories.map((category) => (
                    <Chip
                      key={category.value}
                      label={category.label}
                      color={category.color as any}
                      variant={selectedCategory === category.value ? 'filled' : 'outlined'}
                      size="small"
                      onClick={() => setSelectedCategory(category.value)}
                      sx={{ justifyContent: 'flex-start', cursor: 'pointer' }}
                    />
                  ))}
                </Box>

                <Typography variant="h6" sx={{ mt: 3, mb: 1 }}>
                  {t('stats.title')}
                </Typography>
                <Typography variant="body2" color="text.secondary">
                  • {t('stats.activeRequests', { count: prayers.length })}<br />
                  • {t('stats.totalPrayers', { count: prayers.reduce((sum, p) => sum + p.prayerCount, 0) })}<br />
                  • {t('stats.youPrayed', { count: prayers.filter(p => p.isPrayedFor).length })}
                </Typography>
              </CardContent>
            </Card>
          </Box>

          {/* Prayer Requests */}
          <Box sx={{ flex: 1, width: { xs: '100%', md: '75%' } }}>
            {loading ? (
              <Box>
                {Array.from({ length: 3 }).map((_, index) => (
                  <Card key={index} sx={{ mb: 3 }}>
                    <CardContent>
                      <Box sx={{ display: 'flex', justifyContent: 'space-between', alignItems: 'flex-start', mb: 2 }}>
                        <Box sx={{ flexGrow: 1 }}>
                          <Box sx={{ display: 'flex', alignItems: 'center', gap: 1, mb: 1 }}>
                            <Skeleton variant="text" width="60%" height={32} />
                            <Skeleton variant="rounded" width={80} height={24} />
                          </Box>
                          <Box sx={{ display: 'flex', alignItems: 'center', gap: 2, mb: 2 }}>
                            <Skeleton variant="circular" width={24} height={24} />
                            <Skeleton variant="text" width="30%" height={20} />
                          </Box>
                          <Skeleton variant="text" width="100%" height={24} />
                          <Skeleton variant="text" width="90%" height={24} />
                          <Skeleton variant="text" width="95%" height={24} />
                        </Box>
                      </Box>
                      <Box sx={{ display: 'flex', justifyContent: 'space-between', alignItems: 'center' }}>
                        <Box sx={{ display: 'flex', gap: 1 }}>
                          <Skeleton variant="rounded" width={100} height={32} />
                          <Skeleton variant="rounded" width={100} height={32} />
                        </Box>
                        <Skeleton variant="text" width="20%" height={20} />
                      </Box>
                    </CardContent>
                  </Card>
                ))}
              </Box>
            ) : (
              <Box>
                {prayers.map((prayer) => {
                  const categoryInfo = getCategoryInfo(prayer.category)
                  return (
                    <Card key={prayer.id} sx={{ mb: 3 }}>
                      <CardContent>
                        <Box sx={{ display: 'flex', justifyContent: 'space-between', alignItems: 'flex-start', mb: 2 }}>
                          <Box sx={{ flexGrow: 1 }}>
                            <Box sx={{ display: 'flex', alignItems: 'center', gap: 1, mb: 1 }}>
                              <Typography variant="h6" component="h3">
                                {prayer.title}
                              </Typography>
                              <Chip
                                label={categoryInfo.label}
                                color={categoryInfo.color as any}
                                size="small"
                                variant="outlined"
                              />
                            </Box>

                            <Box sx={{ display: 'flex', alignItems: 'center', gap: 2, mb: 2 }}>
                              <Box sx={{ display: 'flex', alignItems: 'center', gap: 0.5 }}>
                                <Avatar sx={{ width: 24, height: 24, bgcolor: 'primary.main' }}>
                                  <Person sx={{ fontSize: 16 }} />
                                </Avatar>
                                <Typography variant="body2" color="text.secondary">
                                  {prayer.author}
                                </Typography>
                              </Box>
                              <Box sx={{ display: 'flex', alignItems: 'center', gap: 0.5 }}>
                                <AccessTime sx={{ fontSize: 16, color: 'text.secondary' }} />
                                <Typography variant="body2" color="text.secondary">
                                  {formatTimestamp(prayer.timestamp)}
                                </Typography>
                              </Box>
                            </Box>

                            <Typography variant="body1" sx={{ mb: 2 }}>
                              {prayer.description}
                            </Typography>
                          </Box>

                          <IconButton size="small">
                            <MoreVert />
                          </IconButton>
                        </Box>

                        <Box sx={{ display: 'flex', justifyContent: 'space-between', alignItems: 'center' }}>
                          <Box sx={{ display: 'flex', gap: 1 }}>
                            <Button
                              variant={prayer.isPrayedFor ? "contained" : "outlined"}
                              color="primary"
                              size="small"
                              startIcon={prayer.isPrayedFor ? <Favorite /> : <FavoriteBorder />}
                              onClick={() => handlePrayFor(prayer.id)}
                              disabled={prayer.isPrayedFor}
                            >
                              {prayer.isPrayedFor ? t('buttons.prayed') : t('buttons.pray')}
                            </Button>
                            <Button
                              variant="outlined"
                              size="small"
                              startIcon={<Share />}
                            >
                              {t('buttons.share')}
                            </Button>
                          </Box>

                          <Typography variant="body2" color="text.secondary">
                            {t('stats.totalPrayers', { count: prayer.prayerCount })}
                          </Typography>
                        </Box>
                      </CardContent>
                    </Card>
                  )
                })}
              </Box>
            )}
          </Box>
        </Box>

        {/* Add Prayer Dialog */}
        <Dialog
          open={openDialog}
          onClose={() => setOpenDialog(false)}
          maxWidth="md"
          fullWidth
        >
          <DialogTitle>
            <Box sx={{ display: 'flex', justifyContent: 'space-between', alignItems: 'center' }}>
              {t('dialog.title')}
              <IconButton onClick={() => setOpenDialog(false)} size="small">
                <Close />
              </IconButton>
            </Box>
          </DialogTitle>

          {/* Tabs for Write vs AI Generate */}
          <Box sx={{ borderBottom: 1, borderColor: 'divider' }}>
            <Tabs value={tabValue} onChange={(e, newValue) => setTabValue(newValue)} centered>
              <Tab
                icon={<Edit />}
                label={locale === 'en' ? 'Write Prayer' : 'Scrie rugăciune'}
                iconPosition="start"
              />
              <Tab
                icon={<AutoAwesome />}
                label={locale === 'en' ? 'AI Generate' : 'Generează cu AI'}
                iconPosition="start"
              />
            </Tabs>
          </Box>

          <DialogContent sx={{ minHeight: 400 }}>
            {/* Write Prayer Tab */}
            {tabValue === 0 && (
              <Box>
                <TextField
                  fullWidth
                  label={t('dialog.titleLabel')}
                  value={newPrayer.title}
                  onChange={(e) => setNewPrayer({ ...newPrayer, title: e.target.value })}
                  sx={{ mb: 2, mt: 1 }}
                />

                <TextField
                  fullWidth
                  label={t('dialog.categoryLabel')}
                  select
                  value={newPrayer.category}
                  onChange={(e) => setNewPrayer({ ...newPrayer, category: e.target.value })}
                  sx={{ mb: 2 }}
                >
                  {categories.map((option) => (
                    <MenuItem key={option.value} value={option.value}>
                      {option.label}
                    </MenuItem>
                  ))}
                </TextField>

                <TextField
                  fullWidth
                  label={t('dialog.descriptionLabel')}
                  multiline
                  rows={6}
                  value={newPrayer.description}
                  onChange={(e) => setNewPrayer({ ...newPrayer, description: e.target.value })}
                  placeholder={t('dialog.placeholder')}
                />
              </Box>
            )}

            {/* AI Generate Prayer Tab */}
            {tabValue === 1 && (
              <Box>
                <Alert severity="info" sx={{ mb: 2 }}>
                  {locale === 'en'
                    ? 'Describe what you\'d like to pray about, and AI will help you create a meaningful prayer.'
                    : 'Descrie pentru ce ai vrea să te rogi, iar AI-ul te va ajuta să creezi o rugăciune semnificativă.'
                  }
                </Alert>

                <TextField
                  fullWidth
                  label={t('dialog.categoryLabel')}
                  select
                  value={newPrayer.category}
                  onChange={(e) => setNewPrayer({ ...newPrayer, category: e.target.value })}
                  sx={{ mb: 2 }}
                >
                  {categories.map((option) => (
                    <MenuItem key={option.value} value={option.value}>
                      {option.label}
                    </MenuItem>
                  ))}
                </TextField>

                <TextField
                  fullWidth
                  label={locale === 'en' ? 'What would you like to pray about?' : 'Pentru ce ai vrea să te rogi?'}
                  multiline
                  rows={4}
                  value={aiPrompt}
                  onChange={(e) => setAiPrompt(e.target.value)}
                  placeholder={locale === 'en'
                    ? 'e.g., "Help me find peace during a difficult time at work" or "Guidance for my family\'s health struggles"'
                    : 'ex. "Ajută-mă să găsesc pace într-o perioadă dificilă la muncă" sau "Îndrumarea pentru problemele de sănătate ale familiei mele"'
                  }
                  sx={{ mb: 2 }}
                />

                <Button
                  fullWidth
                  variant="contained"
                  onClick={handleGenerateAIPrayer}
                  disabled={!aiPrompt.trim() || isGenerating}
                  startIcon={isGenerating ? <CircularProgress size={20} /> : <AutoAwesome />}
                  sx={{ mb: 2 }}
                >
                  {isGenerating
                    ? (locale === 'en' ? 'Generating...' : 'Se generează...')
                    : (locale === 'en' ? 'Generate Prayer with AI' : 'Generează rugăciune cu AI')
                  }
                </Button>

                {newPrayer.title && newPrayer.description && (
                  <Alert severity="success" sx={{ mt: 2 }}>
                    {locale === 'en'
                      ? 'Prayer generated! Switch to the "Write Prayer" tab to review and edit before submitting.'
                      : 'Rugăciune generată! Comută la tabul "Scrie rugăciune" pentru a revizui și edita înainte de a trimite.'
                    }
                  </Alert>
                )}
              </Box>
            )}
          </DialogContent>

          <DialogActions>
            <Button onClick={() => setOpenDialog(false)}>
              {t('dialog.cancel')}
            </Button>
            <Button
              onClick={handleSubmitPrayer}
              variant="contained"
              disabled={!newPrayer.title.trim() || !newPrayer.description.trim()}
            >
              {t('dialog.submit')}
            </Button>
          </DialogActions>
        </Dialog>
      </Container>
    </Box>
  )
}
