import { Box, Card, Chip, Divider, LinearProgress, Stack, TextField, Typography, Alert } from '@mui/material'
import { MapPin, Ruler, Wallet, Clock, CheckSquare, ShieldAlert } from 'lucide-react'
import type { ParsedNeedCriteria } from '../../domain/needBuilder'
import { WEIGHTING_KEYS, WEIGHTING_LABELS } from '../../domain/needBuilder'
import type { WeightingKey } from '../../domain/needBuilder'

interface Props {
  criteria: ParsedNeedCriteria
  weights: Record<WeightingKey, number>
  confidenceByField: Record<string, number>
  missingFields: string[]
  needTitle: string
  onNeedTitleChange: (v: string) => void
}

const ASSET_LABELS: Record<string, string> = {
  OFFICE: 'Büro', LOGISTICS: 'Logistik / Lager', RETAIL: 'Retail',
  PRODUCTION: 'Produktion', GASTRO: 'Gastro / F&B', LIGHT_INDUSTRIAL: 'Light Industrial',
}

const CRITICAL_FIELDS = ['assetType', 'areaRange', 'preferredLocations', 'budgetRange', 'timing']

export function NeedCardPreview({ criteria: c, weights, confidenceByField, missingFields, needTitle, onNeedTitleChange }: Props) {
  const maxWeight = Math.max(...WEIGHTING_KEYS.map(k => weights[k] ?? 0), 0.01)

  const fieldEntries = Object.entries(confidenceByField)
  const overallConfidence = fieldEntries.length > 0
    ? fieldEntries.reduce((sum, [, v]) => sum + v, 0) / fieldEntries.length
    : 0
  const lowConfidenceFields = fieldEntries.filter(([, v]) => v < 0.6).map(([k]) => k)
  const criticalMissing = missingFields.filter(f => CRITICAL_FIELDS.some(cf => f.toLowerCase().includes(cf.toLowerCase())))
  const isLowConfidence = overallConfidence < 0.6

  return (
    <Box sx={{ maxWidth: 720, mx: 'auto' }}>
      <Typography variant="subtitle1" sx={{ fontWeight: 600, mb: 2 }}>
        Vorschau — Neuer Bedarf
      </Typography>

      {/* Need Title */}
      <TextField
        fullWidth
        size="small"
        label="Bedarf Bezeichnung"
        placeholder="z.B. Bürofläche Zürich Q4/2025"
        value={needTitle}
        onChange={e => onNeedTitleChange(e.target.value)}
        sx={{ mb: 2 }}
      />

      {/* Low-confidence warning */}
      {isLowConfidence && (
        <Alert severity="warning" icon={<ShieldAlert size={18} />} sx={{ mb: 2 }}>
          Gesamtkonfidenz niedrig ({Math.round(overallConfidence * 100)}%) — Bedarf wird als Entwurf gespeichert und muss manuell geprüft werden.
        </Alert>
      )}

      {/* Critical missing fields */}
      {criticalMissing.length > 0 && (
        <Alert severity="error" sx={{ mb: 2 }}>
          Fehlende Pflichtfelder: {criticalMissing.join(', ')}. Bitte in den Kriterien ergänzen.
        </Alert>
      )}

      <Card sx={{ p: 3, mb: 2 }}>
        {/* Header */}
        <Box sx={{ display: 'flex', alignItems: 'center', gap: 1, mb: 2 }}>
          {c.assetType && (
            <Chip label={ASSET_LABELS[c.assetType] ?? c.assetType} size="small" sx={{ bgcolor: '#1e3a5f', color: 'white' }} />
          )}
          <Chip label={isLowConfidence ? 'ENTWURF (needs_review)' : 'ENTWURF'} size="small" variant="outlined" />
        </Box>

        <Box sx={{ display: 'grid', gridTemplateColumns: '1fr 1fr', gap: 2, mb: 2 }}>
          {c.preferredLocations && c.preferredLocations.length > 0 && (
            <Box sx={{ display: 'flex', gap: 1 }}>
              <MapPin size={16} color="#64748b" style={{ flexShrink: 0, marginTop: 2 }} />
              <Box>
                <Typography variant="caption" color="text.secondary">Standort</Typography>
                <Typography variant="body2">{c.preferredLocations.join(', ')}</Typography>
              </Box>
            </Box>
          )}
          {c.areaRange && (
            <Box sx={{ display: 'flex', gap: 1 }}>
              <Ruler size={16} color="#64748b" style={{ flexShrink: 0, marginTop: 2 }} />
              <Box>
                <Typography variant="caption" color="text.secondary">Fläche</Typography>
                <Typography variant="body2">{c.areaRange.min}–{c.areaRange.max} m²</Typography>
              </Box>
            </Box>
          )}
          {c.budgetRange && (
            <Box sx={{ display: 'flex', gap: 1 }}>
              <Wallet size={16} color="#64748b" style={{ flexShrink: 0, marginTop: 2 }} />
              <Box>
                <Typography variant="caption" color="text.secondary">Budget</Typography>
                <Typography variant="body2">max. CHF {c.budgetRange.maxPerSqm}/m²</Typography>
              </Box>
            </Box>
          )}
          {c.timing && (
            <Box sx={{ display: 'flex', gap: 1 }}>
              <Clock size={16} color="#64748b" style={{ flexShrink: 0, marginTop: 2 }} />
              <Box>
                <Typography variant="caption" color="text.secondary">Verfügbarkeit</Typography>
                <Typography variant="body2">ab {c.timing.earliestMoveIn}</Typography>
              </Box>
            </Box>
          )}
        </Box>

        {c.mustHaveCriteria && c.mustHaveCriteria.length > 0 && (
          <Box sx={{ mb: 2 }}>
            <Box sx={{ display: 'flex', gap: 1, mb: 0.5 }}>
              <CheckSquare size={16} color="#64748b" />
              <Typography variant="caption" color="text.secondary">Must-haves</Typography>
            </Box>
            <Stack direction="row" spacing={0.5} sx={{ flexWrap: 'wrap', gap: 0.5 }}>
              {c.mustHaveCriteria.map(m => (
                <Chip key={m} label={m} size="small" variant="outlined" />
              ))}
            </Stack>
          </Box>
        )}

        <Divider sx={{ my: 2 }} />

        {/* Confidence Summary */}
        <Box sx={{ mb: 2 }}>
          <Box sx={{ display: 'flex', justifyContent: 'space-between', mb: 0.5 }}>
            <Typography variant="caption" sx={{ fontWeight: 600 }} color="text.secondary">
              Gesamtkonfidenz
            </Typography>
            <Typography
              variant="caption"
              sx={{ fontWeight: 700, color: overallConfidence >= 0.7 ? '#1a7a4a' : overallConfidence >= 0.5 ? '#d97706' : '#c0392b' }}
            >
              {Math.round(overallConfidence * 100)}%
            </Typography>
          </Box>
          <LinearProgress
            variant="determinate"
            value={overallConfidence * 100}
            sx={{
              height: 6, borderRadius: 3, bgcolor: '#e2e8f0',
              '& .MuiLinearProgress-bar': {
                bgcolor: overallConfidence >= 0.7 ? '#1a7a4a' : overallConfidence >= 0.5 ? '#d97706' : '#c0392b',
              },
            }}
          />
          {lowConfidenceFields.length > 0 && (
            <Typography variant="caption" color="text.secondary" sx={{ mt: 0.5, display: 'block' }}>
              Unsichere Felder: {lowConfidenceFields.join(', ')}
            </Typography>
          )}
        </Box>

        <Divider sx={{ my: 2 }} />

        {/* Weights */}
        <Typography variant="caption" sx={{ fontWeight: 600, display: 'block', mb: 1 }} color="text.secondary">
          Gewichtungsprofil
        </Typography>
        <Box sx={{ display: 'flex', flexDirection: 'column', gap: 0.75 }}>
          {WEIGHTING_KEYS.map(k => {
            const pct = Math.round((weights[k] ?? 0) * 100)
            return (
              <Box key={k} sx={{ display: 'flex', alignItems: 'center', gap: 1 }}>
                <Typography variant="caption" sx={{ width: 130, flexShrink: 0 }}>{WEIGHTING_LABELS[k]}</Typography>
                <LinearProgress
                  variant="determinate"
                  value={((weights[k] ?? 0) / maxWeight) * 100}
                  sx={{ flex: 1, height: 6, borderRadius: 3, bgcolor: '#e2e8f0', '& .MuiLinearProgress-bar': { bgcolor: '#1e3a5f' } }}
                />
                <Typography variant="caption" sx={{ width: 32, textAlign: 'right' }}>{pct}%</Typography>
              </Box>
            )
          })}
        </Box>
      </Card>
    </Box>
  )
}