import { Box, Card, Typography, Alert, Stack, Chip } from '@mui/material'
import type { ParseNeedResult, ParsedNeedCriteria } from '../../domain/needBuilder'
import { ExtractedFieldRow } from './ExtractedFieldRow'

interface Props {
  result: ParseNeedResult
  criteria: ParsedNeedCriteria
  onCriteriaChange: (c: ParsedNeedCriteria) => void
}

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

// ── Parse helpers ──────────────────────────────────────────────────────────────

function parseAreaRange(s: string): ParsedNeedCriteria['areaRange'] {
  const m = s.match(/(\d+)\s*[–\-]\s*(\d+)/)
  if (m) return { min: parseInt(m[1]), max: parseInt(m[2]) }
  const n = s.match(/(\d+)/)
  if (n) { const v = parseInt(n[1]); return { min: Math.round(v * 0.8), max: Math.round(v * 1.2) } }
  return undefined
}

function parseBudget(s: string): ParsedNeedCriteria['budgetRange'] {
  const n = s.match(/(\d+)/)
  if (!n) return undefined
  return { maxPerSqm: parseInt(n[1]), currency: 'CHF' }
}

function parseList(s: string): string[] {
  return s.split(',').map(x => x.trim()).filter(Boolean)
}

function displayAreaRange(v: ParsedNeedCriteria['areaRange']): string {
  return v ? `${v.min}–${v.max} m²` : ''
}
function displayBudget(v: ParsedNeedCriteria['budgetRange']): string {
  return v ? `CHF ${v.maxPerSqm}/m²` : ''
}
function displayTiming(v: ParsedNeedCriteria['timing']): string {
  if (!v) return ''
  return `ab ${v.earliestMoveIn}${v.flexibleTiming ? ' (flexibel)' : ''}`
}

// ── Section wrapper ────────────────────────────────────────────────────────────

function Section({ title, children }: { title: string; children: React.ReactNode }) {
  return (
    <Box sx={{ mb: 2 }}>
      <Typography variant="overline" sx={{ fontWeight: 700, color: '#64748b', fontSize: 10, letterSpacing: 1 }}>
        {title}
      </Typography>
      {children}
    </Box>
  )
}

// ── Main component ─────────────────────────────────────────────────────────────

export function CriteriaReviewPanel({ result, criteria: c, onCriteriaChange: set }: Props) {
  const { confidenceByField: conf, missingFields, assumptions } = result

  return (
    <Card sx={{ p: 3, height: '100%', overflowY: 'auto' }}>
      <Typography variant="subtitle1" sx={{ fontWeight: 600, mb: 0.5 }}>
        Extrahierte Kriterien
      </Typography>
      <Typography variant="caption" color="text.secondary" sx={{ display: 'block', mb: 2 }}>
        {result.rawSummary}
      </Typography>

      {/* ── Hard Facts ──────────────────────────────────────────────────── */}
      <Section title="Hard Facts">
        <ExtractedFieldRow
          label="Nutzungstyp"
          value={c.assetType ? (ASSET_LABELS[c.assetType] ?? c.assetType) : ''}
          confidence={conf.assetType ?? 0.2}
          missing={!c.assetType}
          onEdit={v => set({ ...c, assetType: (v.toUpperCase() as ParsedNeedCriteria['assetType']) })}
        />
        <ExtractedFieldRow
          label="Flächenbedarf (z.B. 500–800)"
          value={displayAreaRange(c.areaRange)}
          confidence={conf.areaRange ?? 0.2}
          missing={!c.areaRange}
          onEdit={v => set({ ...c, areaRange: parseAreaRange(v) })}
        />
        <ExtractedFieldRow
          label="Standort (Komma-getrennt)"
          value={c.preferredLocations?.join(', ') ?? ''}
          confidence={conf.preferredLocations ?? 0.15}
          missing={!c.preferredLocations?.length}
          onEdit={v => set({ ...c, preferredLocations: parseList(v) })}
        />
        <ExtractedFieldRow
          label="Budget (max CHF/m²)"
          value={displayBudget(c.budgetRange)}
          confidence={conf.budgetRange ?? 0.2}
          missing={!c.budgetRange}
          onEdit={v => set({ ...c, budgetRange: parseBudget(v) })}
        />
        <ExtractedFieldRow
          label="Verfügbarkeit (ab Datum)"
          value={displayTiming(c.timing)}
          confidence={conf.timing ?? 0.2}
          missing={!c.timing}
          onEdit={v => set({ ...c, timing: { earliestMoveIn: v, latestMoveIn: v, flexibleTiming: v.toLowerCase().includes('flex') } })}
        />
      </Section>

      {/* ── Must-haves ──────────────────────────────────────────────────── */}
      <Section title="Must-haves">
        <ExtractedFieldRow
          label="Pflichtkriterien (Komma-getrennt)"
          value={c.mustHaveCriteria?.join(', ') ?? ''}
          missing={!c.mustHaveCriteria?.length}
          onEdit={v => set({ ...c, mustHaveCriteria: parseList(v) })}
        />
        <ExtractedFieldRow
          label="Parkplatzbedarf"
          value={c.parkingNeed === true ? 'Ja' : c.parkingNeed === false ? 'Nein' : ''}
          missing={c.parkingNeed === undefined}
          onEdit={v => set({ ...c, parkingNeed: v.toLowerCase().startsWith('j') })}
        />
      </Section>

      {/* ── AI Assumptions ──────────────────────────────────────────────── */}
      {assumptions.length > 0 && (
        <Section title="KI-Annahmen">
          <Stack spacing={0.5}>
            {assumptions.map((a, i) => (
              <Alert key={i} severity="warning" sx={{ py: 0, px: 1, '& .MuiAlert-message': { fontSize: 12 } }}>
                {a}
              </Alert>
            ))}
          </Stack>
        </Section>
      )}

      {/* ── Missing Information ─────────────────────────────────────────── */}
      {missingFields.length > 0 && (
        <Section title="Fehlende Angaben">
          <Stack direction="row" spacing={0.5} sx={{ flexWrap: 'wrap', gap: 0.5 }}>
            {missingFields.map(f => (
              <Chip key={f} label={f} size="small" color="warning" variant="outlined" />
            ))}
          </Stack>
        </Section>
      )}
    </Card>
  )
}
