import { Alert, Box, Button, Chip, Paper, Typography } from '@mui/material'
import { ArrowLeft, Bookmark, Columns2 } from 'lucide-react'
import { MatchScoreDisplay } from '../match-card/MatchScoreDisplay'
import type { Match } from '../../domain/match'
import type { Property } from '../../domain/property'
import type { FutureSignal } from '../../domain/futureSignal'

const RESULT_TYPE_META: Record<string, { label: string; color: string }> = {
  VERIFIED_PORTFOLIO:  { label: 'Verified Portfolio', color: '#152642' },
  MAISON_WORK:         { label: 'Maison Work',        color: '#0369a1' },
  FUTURE_AVAILABILITY: { label: 'Zukunftssignal',     color: '#7c3aed' },
}

function confColor(c: number): string {
  return c >= 0.75 ? '#1a7a4a' : c >= 0.55 ? '#d97706' : '#c0392b'
}

function dqColor(q: number): string {
  return q >= 0.80 ? '#1a7a4a' : q >= 0.60 ? '#d97706' : '#c0392b'
}

interface Props {
  match: Match
  property: Property | null
  signal: FutureSignal | null
  onBack: () => void
  onCompare: () => void
  onShortlist: () => void
}

export function MatchDetailHeader({ match, property, signal, onBack, onCompare, onShortlist }: Props) {
  const rt = RESULT_TYPE_META[match.resultType ?? 'VERIFIED_PORTFOLIO'] ?? { label: '–', color: '#64748b' }
  const title = property?.title ?? signal?.companyName ?? signal?.locationHint ?? '–'
  const isFuture = match.resultType === 'FUTURE_AVAILABILITY'
  const dqScore = property?.dataQuality?.score ?? signal?.confidenceScore ?? 0.5
  const confPct = Math.round(match.confidenceLevel * 100)
  const dqPct = Math.round(dqScore * 100)
  const location = property?.location?.city
    ? `${property.location.city}${property.location.district ? `, ${property.location.district}` : ''}`
    : signal?.locationHint ?? '–'
  const source = property?.sourceLabel ?? property?.sourceMeta?.sourceLabel ?? '–'
  const availability = property?.availabilityDate ?? (signal?.timeHorizonMonths ? `~${signal.timeHorizonMonths} Monate` : undefined)

  return (
    <Paper sx={{ p: 3, mb: 2 }}>
      {isFuture && (
        <Alert severity="warning" sx={{ mb: 2 }}>
          Probabilistisches Signal – keine bestätigte Fläche. Alle Angaben sind Schätzungen.
        </Alert>
      )}

      <Button
        startIcon={<ArrowLeft size={16} />}
        onClick={onBack}
        size="small"
        sx={{ mb: 1.5, color: '#64748b' }}
      >
        Zurück zu Resultaten
      </Button>

      <Box sx={{ display: 'flex', alignItems: 'flex-start', justifyContent: 'space-between', gap: 2, flexWrap: 'wrap' }}>
        <Box sx={{ flex: 1, minWidth: 0 }}>
          <Typography variant="h5" sx={{ fontWeight: 700, mb: 0.5 }}>{title}</Typography>
          <Typography variant="body2" color="text.secondary" sx={{ mb: 1 }}>{location}</Typography>

          <Box sx={{ display: 'flex', flexWrap: 'wrap', gap: 0.75, alignItems: 'center' }}>
            <Chip label={rt.label} size="small" sx={{ bgcolor: rt.color, color: 'white', fontWeight: 600 }} />
            {property?.assetType && (
              <Chip label={property.assetType} size="small" variant="outlined" />
            )}
            <Chip
              label={`${confPct}% Konfidenz`}
              size="small"
              sx={{ bgcolor: confColor(match.confidenceLevel), color: 'white' }}
            />
            <Chip
              label={`DQ ${dqPct}%`}
              size="small"
              sx={{ bgcolor: dqColor(dqScore), color: 'white' }}
            />
            {availability && <Chip label={availability} size="small" variant="outlined" />}
            {source !== '–' && (
              <Typography variant="caption" color="text.secondary">Quelle: {source}</Typography>
            )}
          </Box>
        </Box>

        <Box sx={{ display: 'flex', flexDirection: 'column', alignItems: 'flex-end', gap: 1.5 }}>
          <MatchScoreDisplay score={match.matchScore} size="lg" />
          <Box sx={{ display: 'flex', gap: 1 }}>
            <Button
              variant="outlined"
              size="small"
              startIcon={<Bookmark size={14} />}
              onClick={onShortlist}
            >
              Shortlist
            </Button>
            <Button
              variant="contained"
              size="small"
              startIcon={<Columns2 size={14} />}
              onClick={onCompare}
              sx={{ bgcolor: '#152642', '&:hover': { bgcolor: '#162d4a' } }}
            >
              Vergleichen
            </Button>
          </Box>
        </Box>
      </Box>
    </Paper>
  )
}