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import { useState, useEffect } from "react";
import { useParams, useNavigate } from "react-router-dom";
import { Trash, Edit, ArrowDownRight, ArrowUpRight } from "lucide-react";
import AppLayout from "@/components/layout/AppLayout";
import Header from "@/components/shared/Header";
import { Button } from "@/components/ui/button";
import { cn } from "@/lib/utils";
import { Transaction } from "@/components/dashboard/RecentTransactions";
import { toast } from "sonner";
import database from "@/services/database";

const TransactionDetail = () => {
  const { id } = useParams<{ id: string }>();
  const navigate = useNavigate();
  const [transaction, setTransaction] = useState<Transaction | null>(null);
  const [isLoading, setIsLoading] = useState(true);
  
  useEffect(() => {
    const loadTransaction = async () => {
      if (!id) return;
      
      try {
        await database.initialize();
        
        // Fetch the transaction from SQLite
        const results = database.exec('SELECT * FROM transactions WHERE id = ?', [id]);
        
        if (results.length === 0) {
          setTransaction(null);
        } else {
          const row = results[0];
          // Convert to our Transaction type
          setTransaction({
            id: row.id,
            title: row.title,
            amount: parseFloat(row.amount),
            type: row.type as 'income' | 'expense',
            category: row.category,
            date: new Date(row.date),
            note: row.note || undefined
          });
        }
      } catch (error) {
        console.error('Error loading transaction:', error);
        toast.error('Failed to load transaction');
      } finally {
        setIsLoading(false);
      }
    };
    
    loadTransaction();
  }, [id]);
  
  if (isLoading) {
    return (
      <AppLayout>

        <div className="max-w-md mx-auto p-4 flex justify-center">

          <div className="animate-spin rounded-full h-8 w-8 border-b-2 border-primary"></div>

        </div>

      </AppLayout>
    );
  }
  
  if (!transaction) {
    return (
      <AppLayout>

        <div className="max-w-md mx-auto p-4 text-center">

          <h2 className="text-xl font-semibold">Transaction not found</h2>

          <Button 

            onClick={() => navigate('/transactions')}

            className="mt-4"

          >

            Go Back

          </Button>

        </div>

      </AppLayout>
    );
  }
  
  const formatDate = (date: Date) => {
    return new Intl.DateTimeFormat('en-US', {
      weekday: 'long',
      year: 'numeric',
      month: 'long',
      day: 'numeric'
    }).format(date);
  };
  
  const formatCurrency = (amount: number) => {
    return new Intl.NumberFormat('en-US', {
      style: 'currency',
      currency: 'USD',
      currencyDisplay: 'symbol',
    }).format(Math.abs(amount));
  };
  
  const handleDelete = async () => {
    if (!id) return;
    
    try {
      await database.initialize();
      
      // Delete the transaction from SQLite
      database.exec('DELETE FROM transactions WHERE id = ?', [id]);
      
      toast.success('Transaction deleted successfully');
      navigate('/transactions');
    } catch (error) {
      console.error('Error deleting transaction:', error);
      toast.error('Failed to delete transaction');
    }
  };
  
  return (
    <AppLayout>

      <div className="max-w-md mx-auto">

        <Header 

          title="Transaction Details"

          showBackButton

          rightElement={

            <Button 

              variant="ghost" 

              size="icon"

              onClick={handleDelete}

              className="text-red-500 hover:text-red-600 hover:bg-red-50"

            >

              <Trash size={18} />

            </Button>

          }

        />

        

        <div className="p-4 space-y-6 animate-fade-in">

          <div className="flex justify-center py-6">

            <div 

              className={cn(

                "w-16 h-16 rounded-full flex items-center justify-center",

                transaction.type === "expense" 

                  ? "bg-red-100 text-red-600" 

                  : "bg-green-100 text-green-600"

              )}

            >

              {transaction.type === "expense" 

                ? <ArrowUpRight size={28} /> 

                : <ArrowDownRight size={28} />

              }

            </div>

          </div>

          

          <div className="text-center">

            <h2 className="text-2xl font-semibold">{transaction.title}</h2>

            <p className={cn(

              "text-3xl font-bold mt-2",

              transaction.type === "expense" ? "text-red-600" : "text-green-600"

            )}>

              {transaction.type === "expense" ? "- " : "+ "}

              {formatCurrency(transaction.amount)}

            </p>

            <p className="text-muted-foreground mt-1">{formatDate(transaction.date)}</p>

          </div>

          

          <div className="bg-card border border-border rounded-xl p-4 space-y-4">

            <div>

              <p className="text-sm text-muted-foreground">Type</p>

              <p className="font-medium capitalize">{transaction.type}</p>

            </div>

            

            <div>

              <p className="text-sm text-muted-foreground">Category</p>

              <p className="font-medium capitalize">{transaction.category}</p>

            </div>

            

            <div>

              <p className="text-sm text-muted-foreground">Note</p>

              <p className="font-medium">{transaction.note || "No notes"}</p>

            </div>

          </div>

          

          <Button 

            onClick={() => navigate(`/edit-transaction/${transaction.id}`)}

            className="w-full flex items-center justify-center py-6"

          >

            <Edit size={18} className="mr-2" />

            Edit Transaction

          </Button>

        </div>

      </div>

    </AppLayout>
  );
};

export default TransactionDetail;