import { Box, Chip, Paper, Typography } from '@mui/material'
import { HardHat } from 'lucide-react'
import { effectiveAnnualBurdenPerSqm } from '../../lib/fitOutUtils'
import { DS_TEXT, DS_SURFACE, DS_BORDER } from '../../lib/ds'
import { FITOUT_AMORTIZATION_YEARS, FITOUT_ANNUITY_RATE, FIT_OUT_LABELS } from '../../lib/constants'

const RATE_PCT = Math.round(FITOUT_ANNUITY_RATE * 100)

interface Props {
  fitOut: string
  areaSqm: number
  mabPerSqm: number
  rentPricePerSqm: number
  fitOutByLandlord?: boolean
}

function chf(value: number): string {
  return `CHF ${Math.round(value).toLocaleString('de-CH')}.–`
}

interface RowProps { label: string; value: string; sub?: string; isTotal?: boolean; isWarning?: boolean }

function Row({ label, value, sub, isTotal, isWarning }: RowProps) {
  return (
    <Box sx={{
      display: 'flex', justifyContent: 'space-between', alignItems: 'flex-start',
      py: 0.875, borderBottom: isTotal ? 'none' : `1px solid ${DS_BORDER.default}`,
      bgcolor: isTotal ? (isWarning ? DS_SURFACE.warning.bg : DS_SURFACE.success.bg) : 'transparent',
      px: isTotal ? 1.5 : 0, mx: isTotal ? -1.5 : 0, borderRadius: isTotal ? 1 : 0,
    }}>
      <Box>
        <Typography variant="body2" sx={{ fontWeight: isTotal ? 700 : 400 }}>{label}</Typography>
        {sub && <Typography variant="caption" sx={{ color: DS_TEXT.muted }}>{sub}</Typography>}
      </Box>
      <Typography variant="body2" sx={{ fontWeight: isTotal ? 700 : 500, color: isTotal ? DS_TEXT.primary : DS_TEXT.secondary, flexShrink: 0, ml: 2 }}>
        {value}
      </Typography>
    </Box>
  )
}

export function FitOutCostPanel({ fitOut, areaSqm, mabPerSqm, rentPricePerSqm, fitOutByLandlord }: Props) {
  const { fitOutPerSqm } = effectiveAnnualBurdenPerSqm({ fitOut, rentPricePerSqm, mabPerSqm, fitOutByLandlord })
  const rentPerYear = rentPricePerSqm * areaSqm
  const fitOutPerYear = fitOutPerSqm * areaSqm
  const totalPerYear = rentPerYear + fitOutPerYear
  const fitOutLabel = FIT_OUT_LABELS[fitOut] ?? fitOut

  // Kein Aufschlag → entweder Vermieter übernimmt oder Fläche bereits bezugsfertig
  const hasSurcharge = fitOutPerYear > 0
  const isWarning = totalPerYear > rentPerYear * 1.3
  const disclaimer = hasSurcharge
    ? `Ausbaukosten nach CRB/BKP-Normen, annuitätisch über ${FITOUT_AMORTIZATION_YEARS} Jahre zu ${RATE_PCT}% p.a. Tatsächliche Kosten je nach Ausbauumfang.`
    : null

  return (
    <Paper sx={{ p: 2.5 }}>
      <Box sx={{ display: 'flex', alignItems: 'center', gap: 1, mb: 2 }}>
        <HardHat size={15} color={DS_TEXT.secondary} />
        <Typography variant="h6" sx={{ fontWeight: 700 }}>Reale Jahresbelastung</Typography>
        {hasSurcharge && (
          <Chip
            label="CRB/BKP Richtwerte"
            size="small"
            sx={{ ml: 'auto', bgcolor: DS_SURFACE.blue.bg, color: DS_TEXT.signalDark, fontSize: 10, height: 20, border: `1px solid ${DS_SURFACE.blue.border}` }}
          />
        )}
      </Box>

      <Box sx={{ px: 1.5, border: `1px solid ${DS_BORDER.default}`, borderRadius: 1.5, overflow: 'hidden' }}>
        <Row
          label="Jahresmiete"
          value={chf(rentPerYear)}
          sub={`CHF ${rentPricePerSqm}/m²/Jahr × ${areaSqm.toLocaleString('de-CH')} m²`}
        />
        {fitOutByLandlord ? (
          <Row
            label="Ausbau"
            value="CHF 0.–"
            sub={`${fitOutLabel} — Ausbau im Mietzins enthalten`}
          />
        ) : !hasSurcharge ? (
          <Row
            label="Ausbau"
            value="CHF 0.–"
            sub={`${fitOutLabel} — bezugsfertig`}
          />
        ) : (
          <Row
            label={`Ausbau (annuit. ${FITOUT_AMORTIZATION_YEARS} J. / ${RATE_PCT}%)`}
            value={chf(fitOutPerYear)}
            sub={
              `${fitOutLabel}` +
              (mabPerSqm > 0 ? ` abzgl. CHF ${mabPerSqm} MAB` : '') +
              ` — CHF ${fitOutPerSqm}/m²/Jahr × ${areaSqm.toLocaleString('de-CH')} m²`
            }
          />
        )}
        <Row
          label="Total/Jahr"
          value={chf(totalPerYear)}
          isTotal
          isWarning={isWarning}
        />
      </Box>

      {disclaimer && (
        <Typography variant="caption" sx={{ color: DS_TEXT.muted, display: 'block', mt: 1.25 }}>
          {disclaimer}
        </Typography>
      )}
    </Paper>
  )
}