# Trade Data Processing Strategy

## 1. Data Input and Interface
1. Text-based Input
   - Textarea for CSV data pasting
   - Process and Clear buttons
   - Sample data loading option for testing
   - Loading indicator during processing

2. Results Display
   - Sortable table with visual indicators
   - Separate section for unmatched trades
   - Download results functionality
   - Status updates and error messages

## 2. Data Processing Flow
1. Read and Parse CSV Data
   - Handle account header information
   - Skip empty rows
   - Parse CSV structure properly
   - Validate data format
   - Handle quoted values and special characters

2. Pre-process/Normalize Data
   - Standardize transaction types:
     * Buy/Bought To Open → BUY
     * Sell/Sold To Close → SELL
     * Sold Short → SHORT
     * Bought To Cover → COVER
   - Normalize option symbols
   - Group by security type (options vs stocks)
   - Convert numerical values (price, quantity, etc.)

3. Match Trades
   - Create entry/exit pairs based on:
     * Symbol matching
     * Transaction type compatibility
     * Chronological order
     * Quantity matching
   - Handle partial fills by tracking remaining quantities
   - Track unmatched trades
   - Support multiple exits for one entry
   - Support multiple entries with multiple exits

4. Calculate Metrics
   - P&L calculation: (exit_price - entry_price) * quantity - total_commissions
   - P&L percentage: (P&L / (entry_price * quantity)) * 100
   - Handle options multiplier (100x)
   - Mark metrics as N/A for unmatched trades

5. Format Output
   - Transform to target format:
     * symbol
     * entry_date
     * exit_date
     * entry_price
     * exit_price
     * option_chain
     * p&l
     * p&l_percent
     * quantity
     * stock_strategy (optional)
   - Sort functionality for all columns
   - Separate display for unmatched trades

## 3. Special Considerations

### Option Trades
- Parse complex option symbols
- Handle contract multiplier (100 shares per contract)
- Extract strike price, expiration, and type (call/put)
- Support both modern and traditional option symbols

### Transaction Matching Rules
- BUY → SELL
- SHORT → COVER
- Bought To Open → Sold To Close
- Sold Short → Bought To Close
- Handle orphaned trades (no matching entry/exit)
- Support partial fills and multiple matches

### Edge Cases
- Unmatched trades (open positions or missing data)
- Partial fills
- Multiple exits for single entry
- Multiple entries with multiple exits
- Dividend payments
- Margin interest
- Corporate actions
- Options expiration
- Commission handling

## 4. Data Validation
- Date format validation
- Numerical value validation
- Symbol format consistency
- Required field presence
- Transaction type validity
- CSV structure validation
- Quote handling in CSV

## 5. Error Handling
- Invalid file format
- Missing required data
- Numerical calculation errors
- Unmatched trades
- Invalid transaction sequences
- CSV parsing errors
- Display user-friendly error messages

## 6. User Interface Features
1. Sorting
   - Click column headers to sort
   - Toggle ascending/descending
   - Visual indicators for sort direction
   - Sort by any column
   - Maintain sort during updates

2. Display
   - Responsive table layout
   - Separate section for unmatched trades
   - Visual distinction for unmatched trades
   - Loading indicators
   - Status messages
   - Error feedback

3. Data Management
   - Clear functionality
   - Download results as CSV
   - Sample data loading
   - Process status updates

## 7. Future Improvements
- Multi-column sort capability
- Column filtering
- Save sort preferences
- Export unmatched trades separately
- Additional trade matching strategies
- Enhanced error reporting
- Performance optimization for large datasets