# History and Stats Implementation Plan

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

## Data Storage
All transcriptions will be stored in a JSON Lines (`.jsonl`) file located at `~/.local/share/toak/history.jsonl`.
Since Toak uses Native AOT and JSON serialization needs source generation, we'll keep the model simple.

**Entry Model:**
```json
{
  "Timestamp": "2025-01-15T09:23:00Z",
  "RawTranscript": "hello world",
  "RefinedText": "Hello world.",
  "SkillName": "Professional",     // null if default type/script
  "DurationMs": 1500               // time taken for STT + LLM
}
```

## `toak history` Command
Provides access to past dictations.

- `toak history` - Shows the last 10 entries.
- `toak history -n <count>` - Shows the last `<count>` entries.
- `toak history --grep <pattern>` - Filters the history entries matching the given keyword in the RefinedText (case-insensitive).
- `toak history --export <file>` - Writes the output as a Markdown file.
- `toak history --shred` - Deletes the `history.jsonl` file entirely.

## `toak stats` Command
Reads the `history.jsonl` file and outputs usage analytics using `Spectre.Console`.

**Metrics:**
- Total recording count
- Total processing duration (sum of `DurationMs`)
- Average processing duration
- Most active day
- Most frequently used skill (if any)

## Architecture Changes
1. **`HistoryManager.cs`**: Handles thread-safe appending `HistoryEntry` to the `.jsonl` file, reading, and clearing.
2. **`DaemonService.cs`**: Calls `HistoryManager.SaveEntry` during the `ProcessStopRecordingAsync` method after text is finalized.
3. **`HistoryCommand.cs` & `StatsCommand.cs`**: CLI command definitions.
4. **`AppJsonSerializerContext.cs`**: Needs `[JsonSerializable(typeof(HistoryEntry))]`.