import { MainLayout } from '@/components/layout/MainLayout.tsx';
import PageHeader from '@/components/layout/PageHeader.tsx';
import MatchCard from '@/components/matches/MatchCard.tsx';
import { FormField } from '@/components/ui';
import Badge from '@/components/ui/Badge.tsx';
import Button from '@/components/ui/Button.tsx';
import { Card, CardContent, CardHeader, CardTitle } from '@/components/ui/Card.tsx';
import MetricItem from '@/components/ui/MetricItem.tsx';
import Select from '@/components/ui/Select.tsx';
import Textarea from '@/components/ui/Textarea.tsx';
import type { TimelineEntry } from '@/components/ui/Timeline.tsx';
import Timeline from '@/components/ui/Timeline.tsx';
import { Container, Flex, Grid, Stack } from '@/components/ui/layout';
import { useAuth } from '@/contexts/AuthContext.tsx';
import { useMatch, useUpdateMatchStatus } from '@/hooks/api/useMatchingAPI.ts';
import { useTranslation } from '@/hooks/useI18n.tsx';
import { useNavigation } from '@/hooks/useNavigation.tsx';
import {
  AlertTriangle,
  ArrowLeft,
  CheckCircle,
  Clock,
  DollarSign,
  MapPin,
  TrendingUp,
} from 'lucide-react';
import { useCallback, useMemo, useState } from 'react';
import { useParams } from 'react-router-dom';
import { formatCurrency } from '../lib/fin';

const MatchDetailPage = () => {
  const { id: matchId } = useParams<{ id: string }>();
  const { t } = useTranslation();
  const { handleBackNavigation, handleFooterNavigate } = useNavigation();
  const { user } = useAuth();

  const { data: match, isLoading, error } = useMatch(matchId);
  const updateStatusMutation = useUpdateMatchStatus();

  const [showStatusUpdate, setShowStatusUpdate] = useState(false);
  const [newStatus, setNewStatus] = useState('');
  const [statusNotes, setStatusNotes] = useState('');

  const getHistoryTitle = useCallback(
    (action: string, value?: string) => {
      switch (action) {
        case 'status_change':
          return t('matchDetail.statusChanged');
        case 'comment':
          return t('matchDetail.commentAdded');
        case 'update':
          return t('matchDetail.matchUpdated');
        default:
          return value || action;
      }
    },
    [t]
  );

  // Transform match history to timeline format
  const timelineEntries: TimelineEntry[] = useMemo(() => {
    if (!match?.History) return [];

    return match.History.map((entry, index) => ({
      id: `history-${index}`,
      timestamp: entry.timestamp,
      title: getHistoryTitle(entry.action, entry.new_value || entry.old_value),
      description: entry.notes,
      actor: entry.actor,
      action: entry.action,
      oldValue: entry.old_value,
      newValue: entry.newValue,
    }));
  }, [match.History, getHistoryTitle]);

  const handleStatusUpdate = async () => {
    if (!match || !newStatus || !user) return;

    try {
      await updateStatusMutation.mutateAsync({
        matchId: match.ID,
        status: newStatus,
        actor: user.email || user.name || 'Unknown',
        notes: statusNotes,
      });

      setShowStatusUpdate(false);
      setNewStatus('');
      setStatusNotes('');
    } catch (error) {
      console.error('Failed to update match status:', error);
    }
  };

  // central fin.formatCurrency used throughout the app

  const formatScore = (score: number) => {
    return `${(score * 100).toFixed(1)}%`;
  };

  if (isLoading) {
    return (
      <MainLayout onNavigate={handleFooterNavigate} className="bg-muted/30">
        <Container size="2xl" className="py-8 sm:py-12">
          <div className="animate-pulse">
            <div className="h-8 bg-muted rounded w-1/3 mb-8"></div>
            <div className="h-64 bg-muted rounded mb-8"></div>
            <div className="h-48 bg-muted rounded"></div>
          </div>
        </Container>
      </MainLayout>
    );
  }

  if (error || !match) {
    return (
      <MainLayout onNavigate={handleFooterNavigate} className="bg-muted/30">
        <Container size="2xl" className="py-8 sm:py-12">
          <PageHeader
            title={t('matchDetail.errorTitle')}
            subtitle={t('matchDetail.errorSubtitle')}
            onBack={handleBackNavigation}
          />
          <Card>
            <CardContent className="py-12">
              <div className="text-center">
                <p className="text-destructive mb-4">
                  {error?.message || t('matchDetail.notFound')}
                </p>
                <Button onClick={handleBackNavigation}>
                  <ArrowLeft className="h-4 mr-2 text-current w-4" />
                  {t('common.back')}
                </Button>
              </div>
            </CardContent>
          </Card>
        </Container>
      </MainLayout>
    );
  }

  const statusOptions = [
    { value: 'suggested', label: t('matchStatus.suggested') },
    { value: 'negotiating', label: t('matchStatus.negotiating') },
    { value: 'reserved', label: t('matchStatus.reserved') },
    { value: 'contracted', label: t('matchStatus.contracted') },
    { value: 'live', label: t('matchStatus.live') },
    { value: 'failed', label: t('matchStatus.failed') },
    { value: 'cancelled', label: t('matchStatus.cancelled') },
  ];

  return (
    <MainLayout onNavigate={handleFooterNavigate} className="bg-muted/30">
      <Container size="2xl" className="py-8 sm:py-12">
        <PageHeader
          title={t('matchDetail.title')}
          subtitle={`${t('matchDetail.matchId')} ${match.ID}`}
          onBack={handleBackNavigation}
        />

        <Stack spacing="2xl">
          {/* Match Overview Card */}
          <MatchCard match={match} />

          {/* Key Metrics */}
          <Grid cols={{ md: 2, lg: 4 }} gap="md">
            <MetricItem
              icon={<TrendingUp className="h-4 h-5 text-current text-success w-4 w-5" />}
              label={t('matchDetail.compatibilityScore')}
              value={formatScore(match.CompatibilityScore)}
            />
            <MetricItem
              icon={<DollarSign className="h-4 h-5 text-current text-primary w-4 w-5" />}
              label={t('matchDetail.economicValue')}
              value={formatCurrency(match.EconomicValue)}
            />
            <MetricItem
              icon={<MapPin className="h-4 h-5 text-current text-warning w-4 w-5" />}
              label={t('matchDetail.distance')}
              value={`${match.DistanceKm.toFixed(1)} km`}
            />
            <MetricItem
              icon={<CheckCircle className="h-4 h-5 text-current text-muted-foreground w-4 w-5" />}
              label={t('matchDetail.priority')}
              value={match.Priority.toString()}
            />
          </Grid>

          {/* Economic Impact & Risk Assessment */}
          <Grid cols={{ md: 2 }} gap="lg">
            {/* Economic Impact */}
            {match.EconomicImpact && (
              <Card>
                <CardHeader>
                  <CardTitle className="flex items-center gap-2">
                    <DollarSign className="h-4 h-5 text-current w-4 w-5" />
                    {t('matchDetail.economicImpact')}
                  </CardTitle>
                </CardHeader>
                <CardContent>
                  <Stack spacing="sm">
                    {match.EconomicImpact.annual_savings && (
                      <div className="flex justify-between items-center py-2 border-b">
                        <span className="text-sm font-medium">
                          {t('matchDetail.annualSavings')}
                        </span>
                        <span className="text-sm font-semibold text-success">
                          {formatCurrency(match.EconomicImpact.annual_savings)}
                        </span>
                      </div>
                    )}
                    {match.EconomicImpact.npv && (
                      <div className="flex justify-between items-center py-2 border-b">
                        <span className="text-sm font-medium">{t('matchDetail.npv')}</span>
                        <span className="text-sm font-semibold">
                          {formatCurrency(match.EconomicImpact.npv)}
                        </span>
                      </div>
                    )}
                    {match.EconomicImpact.irr && (
                      <div className="flex justify-between items-center py-2 border-b">
                        <span className="text-sm font-medium">{t('matchDetail.irr')}</span>
                        <span className="text-sm font-semibold">
                          {formatScore(match.EconomicImpact.irr)}
                        </span>
                      </div>
                    )}
                    {match.EconomicImpact.payback_years && (
                      <div className="flex justify-between items-center py-2 border-b">
                        <span className="text-sm font-medium">
                          {t('matchDetail.paybackPeriod')}
                        </span>
                        <span className="text-sm font-semibold">
                          {t('matchDetail.paybackYears', {
                            years: match.EconomicImpact.payback_years.toFixed(1),
                          })}
                        </span>
                      </div>
                    )}
                  </Stack>
                </CardContent>
              </Card>
            )}

            {/* Risk Assessment */}
            {match.RiskAssessment && (
              <Card>
                <CardHeader>
                  <CardTitle className="flex items-center gap-2">
                    <AlertTriangle className="h-4 h-5 text-current w-4 w-5" />
                    {t('matchDetail.riskAssessment')}
                  </CardTitle>
                </CardHeader>
                <CardContent>
                  <Stack spacing="sm">
                    {match.RiskAssessment.technical_risk !== undefined && (
                      <div className="flex justify-between items-center py-2 border-b">
                        <span className="text-sm font-medium">
                          {t('matchDetail.technicalRisk')}
                        </span>
                        <Badge
                          variant={
                            match.RiskAssessment.technical_risk > 0.7
                              ? 'destructive'
                              : match.RiskAssessment.technical_risk > 0.4
                                ? 'secondary'
                                : 'default'
                          }
                        >
                          {formatScore(match.RiskAssessment.technical_risk)}
                        </Badge>
                      </div>
                    )}
                    {match.RiskAssessment.regulatory_risk !== undefined && (
                      <div className="flex justify-between items-center py-2 border-b">
                        <span className="text-sm font-medium">
                          {t('matchDetail.regulatoryRisk')}
                        </span>
                        <Badge
                          variant={
                            match.RiskAssessment.regulatory_risk > 0.7
                              ? 'destructive'
                              : match.RiskAssessment.regulatory_risk > 0.4
                                ? 'secondary'
                                : 'default'
                          }
                        >
                          {formatScore(match.RiskAssessment.regulatory_risk)}
                        </Badge>
                      </div>
                    )}
                    {match.RiskAssessment.market_risk !== undefined && (
                      <div className="flex justify-between items-center py-2">
                        <span className="text-sm font-medium">{t('matchDetail.marketRisk')}</span>
                        <Badge
                          variant={
                            match.RiskAssessment.market_risk > 0.7
                              ? 'destructive'
                              : match.RiskAssessment.market_risk > 0.4
                                ? 'secondary'
                                : 'default'
                          }
                        >
                          {formatScore(match.RiskAssessment.market_risk)}
                        </Badge>
                      </div>
                    )}
                  </Stack>
                </CardContent>
              </Card>
            )}
          </Grid>

          {/* Status Update Section */}
          <Card>
            <CardHeader>
              <Flex align="center" justify="between">
                <CardTitle className="flex items-center gap-2">
                  <CheckCircle className="h-4 h-5 text-current w-4 w-5" />
                  {t('matchDetail.updateStatus')}
                </CardTitle>
                <Button
                  variant="outline"
                  size="sm"
                  onClick={() => setShowStatusUpdate(!showStatusUpdate)}
                >
                  {showStatusUpdate ? t('common.cancel') : t('matchDetail.changeStatus')}
                </Button>
              </Flex>
            </CardHeader>
            {showStatusUpdate && (
              <CardContent>
                <Stack spacing="md">
                  <FormField label={t('matchDetail.newStatus')}>
                    <Select
                      value={newStatus}
                      onValueChange={setNewStatus}
                      options={statusOptions}
                      placeholder={t('matchDetail.selectStatus')}
                    />
                  </FormField>
                  <FormField label={`${t('matchDetail.notes')} (${t('common.optional')})`}>
                    <Textarea
                      value={statusNotes}
                      onChange={(e) => setStatusNotes(e.target.value)}
                      placeholder={t('matchDetail.notesPlaceholder')}
                      rows={3}
                    />
                  </FormField>
                  <Flex gap="sm">
                    <Button
                      onClick={handleStatusUpdate}
                      disabled={!newStatus || updateStatusMutation.isPending}
                    >
                      {updateStatusMutation.isPending
                        ? t('common.updating')
                        : t('matchDetail.updateStatus')}
                    </Button>
                    <Button
                      variant="outline"
                      onClick={() => {
                        setShowStatusUpdate(false);
                        setNewStatus('');
                        setStatusNotes('');
                      }}
                    >
                      {t('common.cancel')}
                    </Button>
                  </Flex>
                </Stack>
              </CardContent>
            )}
          </Card>

          {/* Match History Timeline */}
          <Card>
            <CardHeader>
              <CardTitle className="flex items-center gap-2">
                <Clock className="h-4 h-5 text-current w-4 w-5" />
                {t('matchDetail.matchHistory')}
              </CardTitle>
            </CardHeader>
            <CardContent>
              <Timeline entries={timelineEntries} />
            </CardContent>
          </Card>
        </Stack>
      </Container>
    </MainLayout>
  );
};

export default MatchDetailPage;