# History and Stats

This document outlines the design and implementation of the `history` and `stats` features in Toak.

## Data Storage
All transcriptions are stored in a JSON Lines (`.jsonl`) file.
- **Location**: `~/.local/share/toak/history.jsonl`

**Entry Model:**
```json
{
  "Timestamp": "2025-01-15T09:23:00Z",
  "RawTranscript": "hello world",
  "RefinedText": "Hello world.",
  "SkillName": "Professional",     // null if default
  "DurationMs": 1500               // total processing time
}
```

## `toak history` Command
The CLI provides access to past dictations:
- `toak history`: Shows the last 10 entries.
- `-n <count>`: Shows the last `<count>` entries.
- `--grep <pattern>`: Case-insensitive search through refined text.
- `--export <file>`: Export history as a Markdown file.
- `--shred`: Securely delete the entire `history.jsonl` file.

## `toak stats` Command
Aggregates usage metrics from the history file:
- **Total recordings**: Count of all entries.
- **Total duration**: Cumulative time spent transcribing (in minutes).
- **Average latency**: Mean processing time per request (in seconds).
- **Most active day**: Date with the highest number of recordings.
- **Top spoken words**: The 5 most frequent words (>3 characters).

## Architecture
1. **`HistoryManager.cs`**: Handles thread-safe appending and reading of the `.jsonl` file.
2. **`TranscriptionOrchestrator.cs`**: Calls `HistoryManager.SaveEntry` after text is finalized.
3. **`HistoryCommand.cs` & `StatsCommand.cs`**: CLI command implementations.
4. **`AppJsonSerializerContext.cs`**: Provides AOT-compatible serialization for `HistoryEntry`.