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+# API Documentation
+
+## Overview
+
+This document provides comprehensive API documentation for the Top Drives Records Analyzer, including all public functions, data structures, and their usage patterns.
+
+## Core Modules
+
+### Records Module (`src/records.rs`)
+
+Primary analysis engine for processing JSON-based timing data.
+
+#### Public Functions
+
+##### `main()`
+**Entry point for the records analyzer**
+
+```rust
+#[tokio::main]
+async fn main()
+```
+
+**Purpose**: Command-line interface and operation dispatcher
+
+**Arguments**: Command line arguments
+- `args[1]`: Command (`fetch`, `best`, `missing`, `trash`, `details`, `track`)
+
+**Commands**:
+- `fetch`: Download all data files
+- `best`: Show best owned cars
+- `missing`: Show best unowned cars
+- `trash`: Show removable cars
+- `details`: Export all timing data
+- `track`: Track-specific analysis
+
+**Example**:
+```bash
+cargo run --bin records -- best
+```
+
+##### `print_best_cars(filter_out_owned: bool)`
+**Displays ranked list of best performing cars**
+
+```rust
+fn print_best_cars(filter_out_owned: bool)
+```
+
+**Purpose**: Aggregates performance data across all tracks and conditions
+
+**Arguments**:
+- `filter_out_owned`: If true, excludes owned cars from output
+
+**Output Format**:
+```csv
+RQ,Brand,Model,Year,Count
+85,McLaren,F1,1993,15
+82,Ferrari,250 GTO,1962,12
+```
+
+**Algorithm**:
+1. Count occurrences of each car across all track/RQ/condition combinations
+2. Sort by RQ level, then by car identifier
+3. Apply ownership filter if requested
+
+##### `print_best_times()`
+**Exports comprehensive timing data for all combinations**
+
+```rust
+fn print_best_times()
+```
+
+**Purpose**: Detailed performance export for external analysis
+
+**Output Format**:
+```csv
+RQ,TrackID,Condition,CarRQ,Brand,Model,Year,Config,Time
+85,laguna,Dry,85,McLaren,F1,1993,233,112.45
+```
+
+**Data Volume**: Large output file with all track/condition/RQ combinations
+
+##### `print_best_car(track: &String, condition: &String, rq: &String)`
+**Finds best car for specific track conditions**
+
+```rust
+fn print_best_car(track: &String, condition: &String, rq: &String)
+```
+
+**Purpose**: Targeted analysis for specific racing scenarios
+
+**Arguments**:
+- `track`: Track identifier (e.g., "laguna", "monaco")
+- `condition`: Surface condition (e.g., "Dry", "Wet")
+- `rq`: RQ level limit
+
+**Example**:
+```rust
+print_best_car(&"laguna".to_string(), &"Dry".to_string(), &"85".to_string());
+```
+
+##### `print_trash()`
+**Identifies cars safe for removal from collection**
+
+```rust
+fn print_trash()
+```
+
+**Purpose**: Collection optimization recommendations
+
+**Safety Criteria**:
+- Car not among best performers on any track
+- RQ level below 80 (preserves high-end cars)
+- Not a prize car (may have collection value)
+
+**Output Format**:
+```csv
+RQ,Brand,Model,Year
+45,Toyota,Corolla,1995
+```
+
+##### `parse_car_times(car: Car)`
+**Processes timing data for a single car**
+
+```rust
+async fn parse_car_times(car: Car)
+```
+
+**Purpose**: Core parsing logic for individual car performance data
+
+**Process Flow**:
+1. Load car's JSON timing file
+2. Parse each configuration (111, 233, 323, etc.)
+3. Extract timing data for each track/condition
+4. Apply quality filters (downvotes, time validation)
+5. Update global best cars cache
+
+**Quality Filters**:
+- Minimum time: 1.2 seconds
+- No downvotes from community
+- Special handling for Test Bowl track
+
+##### `parse_all_times()`
+**Orchestrates concurrent processing of all cars**
+
+```rust
+async fn parse_all_times()
+```
+
+**Purpose**: Coordinates parallel processing of car timing files
+
+**Concurrency**: One async task per car file
+**Synchronization**: Waits for all tasks to complete
+
+##### `update_best_car(track_id: &str, car_rq: u8, surface: &str, new_record: BestCarRecord)`
+**Updates global best cars database with new performance data**
+
+```rust
+fn update_best_car(track_id: &str, car_rq: u8, surface: &str, new_record: BestCarRecord)
+```
+
+**Purpose**: Implements core best-car selection algorithm
+
+**RQ Range Analysis**:
+- Tests car from base RQ up to maximum (115)
+- Compares against existing best times
+- Updates records for improved performance
+
+**Logic**:
+1. For each RQ level from car_rq to 115:
+2. If new time is better → replace record
+3. If new time ties → add to list (if not duplicate)
+4. If new time is worse → ignore
+
+##### `get_car_list() -> Vec<Car>`
+**Loads complete car database from repository file**
+
+```rust
+fn get_car_list() -> Vec<Car>
+```
+
+**Purpose**: Provides access to all known cars in the database
+
+**Source**: `cars_repo.json` file
+**Returns**: Vector of all cars with complete metadata
+
+##### `get_my_car_list() -> Vec<String>`
+**Loads user's car collection from game export**
+
+```rust
+fn get_my_car_list() -> Vec<String>
+```
+
+**Purpose**: Identifies which cars the user owns
+
+**Source**: `my_cars.json` game export
+**Filter**: Only `locked: true` cards
+**Returns**: Vector of owned car GUIDs
+
+##### `fetch_times()`
+**Downloads timing files for all cars with rate limiting**
+
+```rust
+async fn fetch_times()
+```
+
+**Purpose**: Batch download of car timing data
+
+**Rate Limiting**: 20 concurrent downloads maximum
+**Progress**: Shows download progress for each file
+
+##### `fetch_car(rid: String)`
+**Downloads timing data for single car**
+
+```rust
+async fn fetch_car(rid: String)
+```
+
+**Purpose**: Individual car data fetching
+
+**URL Format**: `https://api.topdrivesrecords.com/car/{rid}`
+**Storage**: `times/{rid}.json`
+
+##### `get_cars_file()`
+**Downloads main car database**
+
+```rust
+async fn get_cars_file()
+```
+
+**Purpose**: Updates car metadata database
+
+**Source**: GitHub repository cars database
+**Destination**: `cars_repo.json`
+
+##### `get_tracks_file()`
+**Downloads track definitions**
+
+```rust
+async fn get_tracks_file()
+```
+
+**Purpose**: Updates track name mappings
+
+**Source**: GitHub repository tracks database
+**Destination**: `tracks_repo.json`
+
+##### `get_file(file_url: &str, local_file_path: &str)`
+**Generic file download utility**
+
+```rust
+async fn get_file(file_url: &str, local_file_path: &str)
+```
+
+**Purpose**: Downloads files from remote URLs
+
+**Features**:
+- Automatic existing file removal
+- Error handling with graceful failure
+- Progress indication through errors
+
+##### `translate_track_name(track_code: &str) -> &str`
+**Converts track codes to human-readable names**
+
+```rust
+fn translate_track_name(track_code: &str) -> &str
+```
+
+**Purpose**: User-friendly track name display
+
+**Coverage**: 200+ track mappings
+**Fallback**: Returns original code if not found
+
+##### `translate_track_type(track_code: &str) -> &str`
+**Converts condition codes to surface descriptions**
+
+```rust
+fn translate_track_type(track_code: &str) -> &str
+```
+
+**Purpose**: Human-readable surface condition names
+
+**Mappings**:
+- `"00"` → `"Dry"`
+- `"01"` → `"Wet"`
+- `"10"` → `"Dirt"`
+- `"11"` → `"Dirt Wet"`
+
+##### `split_prefix_postfix<'a>(input: &'a str, delimiter: &'a str) -> Option<(&'a str, &'a str)>`
+**String splitting utility for track ID parsing**
+
+```rust
+fn split_prefix_postfix<'a>(input: &'a str, delimiter: &'a str) -> Option<(&'a str, &'a str)>
+```
+
+**Purpose**: Parse track IDs with condition suffixes
+
+**Example**:
+```rust
+split_prefix_postfix("laguna_a00", "_a") // Some(("laguna", "00"))
+```
+
+### Club Module (`src/club.rs`)
+
+Alternative data source using web scraping from topdrives.club.
+
+#### Public Functions
+
+##### `main()`
+**Entry point for club scraper**
+
+```rust
+#[tokio::main]
+async fn main()
+```
+
+**Purpose**: Web scraping interface for live data
+
+**Arguments**:
+- Command line arguments for RQ and track filtering
+- `-d` flag for detailed output
+
+##### `get_page(url: &str) -> String`
+**Fetches HTML content from URLs**
+
+```rust
+async fn get_page(url: &str) -> String
+```
+
+**Purpose**: Downloads web pages for scraping
+
+**Security**: Accepts invalid SSL certificates for compatibility
+
+##### `parse_best_car(text: String) -> Car`
+**Extracts car data from HTML content**
+
+```rust
+fn parse_best_car(text: String) -> Car
+```
+
+**Purpose**: Parses HTML tables to extract car information
+
+**CSS Selectors**:
+- `.carList__item-manufacturer`: Car brand
+- `.carList__item-model`: Car model
+- `.carList__item-year`: Model year
+- `.carList__item-level`: Class and RQ (complex parsing)
+- `.carList__item-upgrade`: Upgrade configuration
+
+##### `parse_tracks(file_name: &str) -> HashMap<u16, String>`
+**Loads track definitions from file**
+
+```rust
+fn parse_tracks(file_name: &str) -> HashMap<u16, String>
+```
+
+**Purpose**: Creates track ID to name mappings
+
+**Format**: Text file with `ID NAME` format per line
+
+##### `get_best_car(track: u16, track_name: String, max_level: u16, detailed: bool) -> String`
+**Scrapes best car data for specific track**
+
+```rust
+async fn get_best_car(track: u16, track_name: String, max_level: u16, detailed: bool) -> String
+```
+
+**Purpose**: Fetches and parses best car from topdrives.club
+
+**API Integration**:
+- Constructs topdrives.club API URLs
+- Parses HTML response tables
+- Formats output based on detail level
+
+##### `parse_argument(args: &Vec<String>, index: usize, min: u16, max: u16) -> u16`
+**Validates command line arguments**
+
+```rust
+fn parse_argument(args: &Vec<String>, index: usize, min: u16, max: u16) -> u16
+```
+
+**Purpose**: Input validation with range checking
+
+**Panics**: On invalid values with descriptive messages
+
+## Data Structures
+
+### Records Module Data Types
+
+#### `Card`
+**User's car collection entry**
+
+```rust
+struct Card {
+    cardId: String,    // Unique card identifier
+    locked: bool,      // Ownership status
+}
+```
+
+#### `Car`
+**Car metadata from database**
+
+```rust
+struct Car {
+    rid: String,       // Repository ID
+    brand: String,     // Manufacturer
+    only_name: String, // Model name
+    year: u16,        // Model year
+    rq: u8,           // Rarity level
+    prize: bool,      // Prize car status
+    guid: String,     // Game GUID
+}
+```
+
+#### `BestCarRecord`
+**Performance record for best cars**
+
+```rust
+struct BestCarRecord {
+    car_rid: String,   // Car identifier
+    brand: String,     // Manufacturer
+    only_name: String, // Model name
+    year: u16,        // Year
+    rq: u8,           // RQ level
+    config: String,    // Tune configuration
+    time: f64,        // Track time
+    owned: bool,      // User ownership
+    guid: String,     // Game identifier
+}
+```
+
+#### `TripletKey`
+**Composite key for track conditions**
+
+```rust
+type TripletKey = (String, u8, String);
+//   Track ID    RQ Level  Surface Condition
+```
+
+### Club Module Data Types
+
+#### `Car`
+**Scraped car data from website**
+
+```rust
+struct Car {
+    class: String,     // Class letter (S, A, B, etc.)
+    rq: u8,           // Rarity level
+    manufacturer: String, // Brand name
+    model: String,    // Model name
+    year: u16,        // Model year
+    upgrade: String,  // Upgrade config
+}
+```
+
+## Global State
+
+### `BEST_CARS` Cache
+**Thread-safe global performance database**
+
+```rust
+static BEST_CARS: Lazy<Mutex<HashMap<TripletKey, Vec<BestCarRecord>>>>
+```
+
+**Initialization**: One-time setup with `once_cell::Lazy`
+**Thread Safety**: Protected by `Mutex` for concurrent access
+**Structure**: HashMap with composite keys for efficient lookups
+
+## Error Handling
+
+### Network Errors
+- **HTTP Failures**: Logged but don't crash application
+- **Invalid JSON**: Graceful fallback to defaults
+- **Missing Files**: Clear error messages for user
+
+### Parse Errors
+- **Malformed Data**: Skip invalid entries
+- **Type Conversion**: Use safe defaults
+- **Missing Fields**: Provide sensible fallbacks
+
+### User Input Errors
+- **Invalid Commands**: Clear usage instructions
+- **Missing Arguments**: Descriptive error messages
+- **Out of Range**: Validation with helpful feedback
+
+## Usage Examples
+
+### Basic Analysis Workflow
+
+```rust
+// 1. Load user's car collection
+let my_cars = get_my_car_list();
+
+// 2. Process all car timing data
+parse_all_times().await;
+
+// 3. Generate best cars report
+print_best_cars(false);
+
+// 4. Find collection optimization opportunities
+print_trash();
+```
+
+### Track-Specific Analysis
+
+```rust
+// Analyze specific track conditions
+let track = "laguna".to_string();
+let condition = "Dry".to_string();
+let rq = "85".to_string();
+
+print_best_car(&track, &condition, &rq);
+```
+
+### Data Fetching
+
+```rust
+// Download fresh data
+get_cars_file().await;
+get_tracks_file().await;
+fetch_times().await;
+```
+
+## Performance Characteristics
+
+### Time Complexity
+- **Parsing**: O(n) where n = number of cars × tracks
+- **Best Car Selection**: O(1) HashMap operations
+- **Sorting**: O(n log n) for output ordering
+
+### Memory Usage
+- **Peak**: ~200-300MB during full analysis
+- **Baseline**: ~50MB application overhead
+- **Per Car**: ~1-2KB metadata + timing data
+
+### Concurrency
+- **Downloads**: 20 concurrent connections max
+- **Processing**: One task per car file
+- **Thread Safety**: Mutex-protected shared state
+
+## Extension Points
+
+### Adding New Commands
+1. Add command parsing in `main()`
+2. Implement analysis function
+3. Update help documentation
+
+### Adding New Data Sources
+1. Implement new module (similar to `club.rs`)
+2. Add data source selection logic
+3. Update configuration system
+
+### Custom Analysis Types
+1. Create new output formatting functions
+2. Add aggregation algorithms
+3. Extend data structures as needed
+
+## Testing
+
+### Unit Tests
+```rust
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[tokio::test]
+    async fn test_parse_car_times() {
+        // Test implementation
+    }
+}
+```
+
+### Integration Tests
+- Full workflow testing
+- File I/O validation
+- Network request mocking
+
+### Benchmarking
+- Parse performance measurement
+- Memory usage profiling
+- Concurrent operation testing
+
+## Security Considerations
+
+### Network Security
+- HTTPS-only external requests
+- Certificate validation (with fallback)
+- No sensitive data transmission
+
+### File System Security
+- Read-only access to game files
+- No modification of user data
+- Safe file path handling
+
+### Input Validation
+- Command injection prevention
+- Path traversal protection
+- Input sanitization
+
+## Troubleshooting API Issues
+
+### Common Problems
+
+**"Function not found"**
+- Check module imports
+- Verify function signatures
+- Ensure proper visibility
+
+**"Type mismatch"**
+- Review struct field types
+- Check function signatures
+- Verify generic parameters
+
+**"Deadlock"**
+- Avoid nested Mutex locks
+- Check lock ordering
+- Use timeout where possible
+
+### Debug Strategies
+
+**Logging**:
+```rust
+println!("Processing car: {}", car.rid);
+eprintln!("Error: {}", error);
+```
+
+**Tracing**:
+```rust
+// Add at function entry
+let _span = tracing::span!(Level::INFO, "function_name");
+let _enter = _span.enter();
+```
+
+**Profiling**:
+```bash
+cargo flamegraph --bin records -- best
+```
+
+## Migration Guide
+
+### Version Compatibility
+- **Current**: 0.2.0 API stable
+- **Previous**: 0.1.0 fully compatible
+- **Future**: Semantic versioning maintained
+
+### Breaking Changes
+- None currently planned
+- Advance notice provided for API changes
+- Deprecation warnings for removed features
+
+---
+
+**API Version**: 0.2.0
+**Last Updated**: 2024-12-XX
+**Compatibility**: Rust 1.70.0+