import { useQuery } from '@tanstack/react-query';
import {
  Box,
  Typography,
  Skeleton,
  Accordion,
  AccordionSummary,
  AccordionDetails,
  Button,
  Chip,
} from '@mui/material';
import ExpandMoreIcon from '@mui/icons-material/ExpandMore';
import ContentCopyIcon from '@mui/icons-material/ContentCopy';
import { adminApi } from '../../lib/api/admin';
import { formatCurrency } from '../../lib/format';
import type { EditableLineItem } from './LineItemEditor';

interface SimilarProposal {
  proposalNumber: string;
  customerName: string;
  serviceCategory: string;
  similarityScore: number;
  totalBidAmount: number;
  lineItems: Array<{
    description: string;
    quantity: number;
    unit: string;
    unitPrice: number | null;
    totalPrice: number;
  }>;
}

interface SimilarProposalsPanelProps {
  proposalId: string;
  onPullLineItem: (item: Omit<EditableLineItem, 'id' | 'sortOrder' | 'source'>) => void;
  disabled?: boolean;
}

export default function SimilarProposalsPanel({ proposalId, onPullLineItem, disabled }: SimilarProposalsPanelProps) {
  const { data: similar, isLoading } = useQuery<SimilarProposal[]>({
    queryKey: ['similarProposals', proposalId],
    queryFn: () => adminApi.getSimilar(proposalId) as Promise<SimilarProposal[]>,
    enabled: !!proposalId,
  });

  if (isLoading) {
    return (
      <Box>
        <Typography variant="subtitle2" sx={{ mb: 1 }}>Similar Proposals</Typography>
        {Array.from({ length: 3 }).map((_, i) => (
          <Skeleton key={i} variant="rectangular" height={40} sx={{ mb: 1, borderRadius: 1 }} />
        ))}
      </Box>
    );
  }

  return (
    <Box>
      <Typography variant="subtitle2" sx={{ mb: 1 }}>
        Similar Proposals {similar && similar.length > 0 && `(${similar.length})`}
      </Typography>

      {similar?.map((sp, idx) => (
        <Accordion key={idx} disableGutters sx={{ '&:before': { display: 'none' }, mb: 1 }}>
          <AccordionSummary expandIcon={<ExpandMoreIcon />} sx={{ minHeight: 'auto', px: 1 }}>
            <Box sx={{ width: '100%' }}>
              <Box sx={{ display: 'flex', justifyContent: 'space-between', alignItems: 'center' }}>
                <Typography variant="caption" sx={{ fontWeight: 600 }}>
                  {sp.proposalNumber}
                </Typography>
                <Chip
                  label={`${Math.round(sp.similarityScore * 100)}%`}
                  size="small"
                  variant="outlined"
                  color="primary"
                />
              </Box>
              <Typography variant="caption" color="text.secondary" sx={{ display: 'block' }}>
                {sp.customerName} - {sp.serviceCategory}
              </Typography>
            </Box>
          </AccordionSummary>
          <AccordionDetails sx={{ px: 1, pt: 0 }}>
            {sp.lineItems.map((li, liIdx) => (
              <Box
                key={liIdx}
                sx={{
                  display: 'flex',
                  justifyContent: 'space-between',
                  alignItems: 'center',
                  py: 0.5,
                  borderBottom: 1,
                  borderColor: 'divider',
                }}
              >
                <Box sx={{ flex: 1, minWidth: 0 }}>
                  <Typography variant="caption" noWrap>{li.description}</Typography>
                  <Typography variant="caption" color="text.secondary" sx={{ display: 'block' }}>
                    {li.quantity} {li.unit} @ {formatCurrency(li.totalPrice)}
                  </Typography>
                </Box>
                {!disabled && (
                  <Button
                    size="small"
                    aria-label={`Copy line item: ${li.description}`}
                    sx={{ minWidth: 'auto', p: 0.5 }}
                    onClick={() =>
                      onPullLineItem({
                        description: li.description,
                        quantity: li.quantity,
                        unit: li.unit,
                        unitPrice: li.unitPrice,
                        totalPrice: li.totalPrice,
                        pricingMode: li.unitPrice ? 'UnitPrice' : 'TotalPrice',
                      })
                    }
                  >
                    <ContentCopyIcon sx={{ fontSize: 14 }} />
                  </Button>
                )}
              </Box>
            ))}
          </AccordionDetails>
        </Accordion>
      ))}
    </Box>
  );
}