import { useState } from 'react'
import { Box, Button, Card, Stack, Typography } from '@mui/material'
import { useNavigate } from 'react-router'
import { useQuery } from '@tanstack/react-query'
import { useUnifiedResults } from '../../hooks/useUnifiedResults'
import { useCompareStore } from '../../stores/compareStore'
import { needService } from '../../services/needService'
import {
  FeedEmptyState,
  FeedSkeleton,
  ResultFeedHeader,
  ResultFilterBar,
  UnifiedResultFeed,
} from '../../components/results'
import type { ResultType } from '../../domain/enums'
import type { UnifiedMatchResult } from '../../domain/unifiedResult'

type FilterSource = ResultType | 'ALL'
type SortBy = 'score' | 'rent' | 'area'

function sortResults(results: UnifiedMatchResult[], sortBy: SortBy): UnifiedMatchResult[] {
  return [...results].sort((a, b) => {
    if (sortBy === 'score') return b.matchScore - a.matchScore
    const propA = a.resultType !== 'FUTURE_AVAILABILITY' ? (a as { property: { rentPricePerSqm: number; areaSqm: number } }).property : null
    const propB = b.resultType !== 'FUTURE_AVAILABILITY' ? (b as { property: { rentPricePerSqm: number; areaSqm: number } }).property : null
    if (sortBy === 'rent') return (propA?.rentPricePerSqm ?? 0) - (propB?.rentPricePerSqm ?? 0)
    if (sortBy === 'area') return (propB?.areaSqm ?? 0) - (propA?.areaSqm ?? 0)
    return 0
  })
}

export default function Results() {
  const navigate = useNavigate()
  const [filterSource, setFilterSource] = useState<FilterSource>('ALL')
  const [sortBy, setSortBy] = useState<SortBy>('score')

  const { data: results = [], isLoading } = useUnifiedResults()
  const { data: needResp } = useQuery({
    queryKey: ['needs'],
    queryFn: () => needService.getAll(),
  })
  const { addToCompare, removeFromCompare, clearCompare, isInCompare, compareTray } = useCompareStore()

  const activeNeed = needResp?.data?.[0]

  const filtered =
    filterSource === 'ALL' ? results : results.filter(r => r.resultType === filterSource)

  const sorted = sortResults(filtered, sortBy)

  const verifiedCount = results.filter(r => r.resultType === 'VERIFIED_PORTFOLIO').length
  const externalCount = results.filter(r => r.resultType === 'EXTERNAL_MARKET').length
  const futureCount   = results.filter(r => r.resultType === 'FUTURE_AVAILABILITY').length

  const handleCompare = (propertyId: string) => {
    if (isInCompare(propertyId)) removeFromCompare(propertyId)
    else addToCompare(propertyId)
  }

  return (
    <Box>
      <ResultFeedHeader
        total={sorted.length}
        verifiedCount={verifiedCount}
        externalCount={externalCount}
        futureCount={futureCount}
      />

      <Box sx={{ px: 3, py: 3 }}>
        {activeNeed && (
          <Card sx={{ bgcolor: '#eff6ff', p: 2, mb: 2, border: '1px solid #bfdbfe' }}>
            <Box sx={{ display: 'flex', alignItems: 'center', justifyContent: 'space-between' }}>
              <Box>
                <Typography variant="subtitle2" sx={{ fontWeight: 600 }} color="#1e3a5f">
                  Aktive Suche: {activeNeed.companyName}
                </Typography>
                <Typography variant="caption" color="text.secondary">
                  {activeNeed.assetType} · {activeNeed.requiredArea.min}–{activeNeed.requiredArea.max} m² ·{' '}
                  {activeNeed.preferredLocations.join(', ')}
                </Typography>
              </Box>
              <Button
                size="small"
                variant="text"
                onClick={() => navigate('/demand/ai-search')}
                sx={{ color: '#1e3a5f' }}
              >
                Suche ändern
              </Button>
            </Box>
          </Card>
        )}

        <ResultFilterBar
          filterSource={filterSource}
          onFilterChange={setFilterSource}
          sortBy={sortBy}
          onSortChange={setSortBy}
        />

        {isLoading ? (
          <FeedSkeleton />
        ) : sorted.length === 0 ? (
          <FeedEmptyState filtered={filterSource !== 'ALL'} />
        ) : (
          <UnifiedResultFeed results={sorted} isInCompare={isInCompare} onCompare={handleCompare} />
        )}
      </Box>

      {compareTray.length > 0 && (
        <Box
          sx={{
            position: 'fixed',
            bottom: 0,
            left: 0,
            right: 0,
            bgcolor: '#1e3a5f',
            color: 'white',
            py: 1.5,
            px: 3,
            display: 'flex',
            alignItems: 'center',
            justifyContent: 'space-between',
            zIndex: 1200,
            boxShadow: '0 -4px 12px rgba(0,0,0,0.15)',
          }}
        >
          <Typography variant="body2" sx={{ fontWeight: 600 }}>
            {compareTray.length} Objekte zum Vergleich ausgewählt
          </Typography>
          <Stack direction="row" spacing={1}>
            <Button
              size="small"
              variant="outlined"
              sx={{ color: 'white', borderColor: 'rgba(255,255,255,0.5)' }}
              onClick={clearCompare}
            >
              Leeren
            </Button>
            <Button
              size="small"
              variant="contained"
              sx={{ bgcolor: 'white', color: '#1e3a5f', '&:hover': { bgcolor: '#f1f5f9' } }}
              onClick={() => navigate('/demand/compare')}
            >
              Vergleich starten
            </Button>
          </Stack>
        </Box>
      )}
    </Box>
  )
}