import { Box, Chip, Paper, Typography } from '@mui/material'
import { CheckCircle2, XCircle, Minus } from 'lucide-react'
import type { Match } from '../../domain/match'
import type { Property } from '../../domain/property'
import type { Need } from '../../domain/need'

type FitStatus = 'MATCH' | 'NO_MATCH' | 'PARTIAL' | 'UNKNOWN'

interface AlignmentRow {
  label: string
  needValue: string
  resultValue: string
  fit: FitStatus
}

function fitIcon(fit: FitStatus) {
  if (fit === 'MATCH')    return <CheckCircle2 size={16} color="#1a7a4a" />
  if (fit === 'NO_MATCH') return <XCircle size={16} color="#c0392b" />
  if (fit === 'PARTIAL')  return <Minus size={16} color="#d97706" />
  return <Minus size={16} color="#94a3b8" />
}

function fitColor(fit: FitStatus): string {
  if (fit === 'MATCH')    return '#f0fdf4'
  if (fit === 'NO_MATCH') return '#fef2f2'
  if (fit === 'PARTIAL')  return '#fffbeb'
  return '#f8fafc'
}

function buildRows(need: Need, property: Property): AlignmentRow[] {
  const rows: AlignmentRow[] = []

  // Area
  const areaSqm = property.areaSqm
  const areaFit: FitStatus = areaSqm >= need.requiredArea.min && areaSqm <= need.requiredArea.max
    ? 'MATCH'
    : areaSqm >= need.requiredArea.min * 0.85
    ? 'PARTIAL'
    : 'NO_MATCH'
  rows.push({
    label: 'Fläche',
    needValue: `${need.requiredArea.min}–${need.requiredArea.max} m²`,
    resultValue: `${areaSqm} m²`,
    fit: areaFit,
  })

  // Location
  const locationFit: FitStatus = need.preferredLocations.some(
    l => l.toLowerCase() === property.location.city.toLowerCase() ||
         l.toLowerCase() === property.location.district?.toLowerCase()
  ) ? 'MATCH' : 'PARTIAL'
  rows.push({
    label: 'Standort',
    needValue: need.preferredLocations.join(', ') || '–',
    resultValue: property.location.city,
    fit: locationFit,
  })

  // Budget
  const budgetFit: FitStatus = property.rentPricePerSqm <= need.budgetRange.maxPerSqm
    ? 'MATCH'
    : property.rentPricePerSqm <= need.budgetRange.maxPerSqm * 1.1
    ? 'PARTIAL'
    : 'NO_MATCH'
  rows.push({
    label: 'Budget',
    needValue: `max. CHF ${need.budgetRange.maxPerSqm}/m²`,
    resultValue: `CHF ${property.rentPricePerSqm}/m²`,
    fit: budgetFit,
  })

  // Timing
  const availDate = property.availabilityDate
  const latestMoveIn = need.timing.latestMoveIn
  const timingFit: FitStatus = !availDate ? 'UNKNOWN'
    : availDate <= latestMoveIn ? 'MATCH' : 'PARTIAL'
  rows.push({
    label: 'Verfügbarkeit',
    needValue: `bis ${need.timing.latestMoveIn}`,
    resultValue: availDate || 'unbekannt',
    fit: timingFit,
  })

  return rows
}

interface Props {
  match: Match
  need: Need | null
  property: Property | null
}

export function NeedAlignmentPanel({ match: _match, need, property }: Props) {
  if (!need || !property) return null

  const rows = buildRows(need, property)
  const mustHaves = need.mustHaveCriteria ?? []

  return (
    <Paper sx={{ p: 2.5, mb: 2 }}>
      <Typography variant="h6" sx={{ fontWeight: 700, mb: 1.5 }}>Need-Alignment</Typography>
      <Typography variant="caption" color="text.secondary" sx={{ display: 'block', mb: 1.5 }}>
        Gesucht: {need.companyName} · {need.assetType}
      </Typography>

      {/* Comparison table */}
      <Box sx={{ mb: 2 }}>
        <Box sx={{ display: 'flex', gap: 0, bgcolor: '#f8fafc', px: 1.5, py: 0.75, borderRadius: 1, mb: 0.5 }}>
          <Typography variant="caption" sx={{ fontWeight: 600, flex: '0 0 130px' }}>Kriterium</Typography>
          <Typography variant="caption" sx={{ fontWeight: 600, flex: 1 }}>Gesucht</Typography>
          <Typography variant="caption" sx={{ fontWeight: 600, flex: 1 }}>Objekt</Typography>
          <Typography variant="caption" sx={{ fontWeight: 600, width: 28, textAlign: 'center' }}>Fit</Typography>
        </Box>
        {rows.map((row, i) => (
          <Box
            key={i}
            sx={{
              display: 'flex',
              alignItems: 'center',
              gap: 0,
              px: 1.5,
              py: 1,
              bgcolor: fitColor(row.fit),
              borderRadius: 0.5,
              mb: 0.5,
            }}
          >
            <Typography variant="body2" sx={{ fontWeight: 500, flex: '0 0 130px' }}>{row.label}</Typography>
            <Typography variant="body2" color="text.secondary" sx={{ flex: 1 }}>{row.needValue}</Typography>
            <Typography variant="body2" sx={{ flex: 1 }}>{row.resultValue}</Typography>
            <Box sx={{ width: 28, display: 'flex', justifyContent: 'center' }}>
              {fitIcon(row.fit)}
            </Box>
          </Box>
        ))}
      </Box>

      {/* Must-haves */}
      {mustHaves.length > 0 && (
        <Box>
          <Typography variant="caption" sx={{ fontWeight: 600, color: '#64748b', display: 'block', mb: 0.75 }}>
            Must-have Kriterien
          </Typography>
          <Box sx={{ display: 'flex', flexWrap: 'wrap', gap: 0.5 }}>
            {mustHaves.map((m, i) => (
              <Chip key={i} label={m.criterion} size="small" variant="outlined" />
            ))}
          </Box>
        </Box>
      )}
    </Paper>
  )
}