import { useMemo } from 'react'
import { Box, ToggleButton, ToggleButtonGroup, Typography } from '@mui/material'
import { getKpisForRadius } from '../../domain/marketReport'
import type { MarketKpis } from '../../domain/marketReport'

interface Props {
  baseKpis: MarketKpis
  assetTypeLabel: string
  radius: number
  onRadiusChange: (r: number) => void
}

const RADII = [5, 10, 15, 20]

function vacancyColor(pct: number): string {
  if (pct < 4) return '#1a7a4a'
  if (pct < 8) return '#d97706'
  return '#dc2626'
}

function vacancyLabel(pct: number): string {
  if (pct < 4) return 'Engpassmarkt'
  if (pct < 8) return 'Ausgewogen'
  return 'Überangebot'
}

function searchesColor(count: number): string {
  if (count >= 15) return '#1a7a4a'
  if (count >= 7) return '#d97706'
  return '#dc2626'
}

function searchesLabel(count: number): string {
  if (count >= 15) return 'Hohe Nachfrage'
  if (count >= 7) return 'Moderate Nachfrage'
  return 'Geringe Nachfrage'
}

function durationColor(months: number): string {
  if (months < 4) return '#1a7a4a'
  if (months < 7) return '#d97706'
  return '#dc2626'
}

function durationLabel(months: number): string {
  if (months < 4) return 'Schnell absorbiert'
  if (months < 7) return 'Moderat'
  return 'Träger Markt'
}

function ratioColor(ratio: number): string {
  if (ratio >= 2) return '#1a7a4a'
  if (ratio >= 1) return '#d97706'
  return '#dc2626'
}

function ratioLabel(ratio: number): string {
  if (ratio >= 2) return 'Nachfrageüberhang'
  if (ratio >= 1) return 'Leicht ausgeglichen'
  return 'Angebotsüberhang'
}

interface KpiCardProps {
  label: string
  value: string
  badge: string
  badgeColor: string
}

function KpiCard({ label, value, badge, badgeColor }: KpiCardProps) {
  return (
    <Box
      sx={{
        flex: 1,
        minWidth: 0,
        p: 1.5,
        border: '1px solid #e2e8f0',
        borderRadius: 1.5,
        bgcolor: '#ffffff',
        display: 'flex',
        flexDirection: 'column',
        gap: 0.5,
      }}
    >
      <Typography variant="caption" sx={{ color: '#64748b', fontWeight: 500, fontSize: '0.7rem', lineHeight: 1.2 }}>
        {label}
      </Typography>
      <Typography variant="body1" sx={{ fontWeight: 700, color: '#0f172a', lineHeight: 1 }}>
        {value}
      </Typography>
      <Box
        sx={{
          display: 'inline-block',
          px: 0.75,
          py: 0.25,
          borderRadius: 0.75,
          bgcolor: `${badgeColor}18`,
          alignSelf: 'flex-start',
          mt: 0.25,
        }}
      >
        <Typography sx={{ fontSize: '0.65rem', fontWeight: 600, color: badgeColor, lineHeight: 1.4 }}>
          {badge}
        </Typography>
      </Box>
    </Box>
  )
}

export function MarketKpiPanel({ baseKpis, assetTypeLabel, radius, onRadiusChange }: Props) {
  const kpis = useMemo(
    () => radius === 5 ? baseKpis : getKpisForRadius(baseKpis, radius),
    [baseKpis, radius]
  )

  return (
    <Box
      sx={{
        mb: 2.5,
        p: 1.75,
        border: '1px solid #e2e8f0',
        borderRadius: 2,
        bgcolor: '#f8fafc',
      }}
    >
      <Box sx={{ display: 'flex', alignItems: 'center', justifyContent: 'space-between', mb: 1.5 }}>
        <Box>
          <Typography variant="body2" sx={{ fontWeight: 700, color: '#0f172a', fontSize: '0.8125rem' }}>
            Marktumfeld — {assetTypeLabel}
          </Typography>
          <Typography variant="caption" sx={{ color: '#94a3b8' }}>
            Vergleichbare Flächen im Umkreis
          </Typography>
        </Box>
        <ToggleButtonGroup
          value={radius}
          exclusive
          onChange={(_, v) => v !== null && onRadiusChange(v)}
          size="small"
          sx={{
            '& .MuiToggleButton-root': {
              py: 0.25,
              px: 0.875,
              fontSize: '0.7rem',
              textTransform: 'none',
              fontWeight: 600,
              border: '1px solid #e2e8f0',
              color: '#64748b',
              '&.Mui-selected': {
                bgcolor: '#1e3a5f',
                color: '#ffffff',
                borderColor: '#1e3a5f',
                '&:hover': { bgcolor: '#1e3a5f' },
              },
            },
          }}
        >
          {RADII.map(r => (
            <ToggleButton key={r} value={r}>
              {r} km
            </ToggleButton>
          ))}
        </ToggleButtonGroup>
      </Box>

      <Box sx={{ display: 'flex', gap: 1 }}>
        <KpiCard
          label="Leerstandsquote"
          value={`${kpis.vacancyRatePct.toFixed(1)} %`}
          badge={vacancyLabel(kpis.vacancyRatePct)}
          badgeColor={vacancyColor(kpis.vacancyRatePct)}
        />
        <KpiCard
          label="Aktive Suchanfragen"
          value={String(kpis.activePlatformSearches)}
          badge={searchesLabel(kpis.activePlatformSearches)}
          badgeColor={searchesColor(kpis.activePlatformSearches)}
        />
        <KpiCard
          label="Ø Leerstandsdauer"
          value={`${kpis.avgVacancyMonths.toFixed(1)} Mo.`}
          badge={durationLabel(kpis.avgVacancyMonths)}
          badgeColor={durationColor(kpis.avgVacancyMonths)}
        />
        <KpiCard
          label="Nachfrage / Angebot"
          value={`${kpis.demandSupplyRatio.toFixed(1)}×`}
          badge={ratioLabel(kpis.demandSupplyRatio)}
          badgeColor={ratioColor(kpis.demandSupplyRatio)}
        />
      </Box>

      <Typography variant="caption" sx={{ color: '#94a3b8', mt: 1, display: 'block' }}>
        Basis: {kpis.comparableListings} vergleichbare {assetTypeLabel}-Flächen im {radius}-km-Radius · KI-gestützte Schätzung
      </Typography>
    </Box>
  )
}