```                   # 📋 Session Report
    λλ              
   λ⊙λ⊙             
  λλλλλλ            
 λλλλλλλλ           
    λλ              
    λλ              
    λλ              
    λλ              
    λλ              
    λλ              
    λλ              
    λλ              
```                 

**🔑 Session ID:** 416cb165-fd18-4083-9224-75660735579f

---

## 📊 Statistics

### Turn Counts

| Metric | Value |
|--------|-------|
| Total Turns | 46 |
| 👤 User Turns | 23 |
| 🤖 LLM Turns | 23 |

### 🔧 Tool Calls

**Total Tool Calls:** 25

`bash_write-file     `   10 ████████████████████████████████████████████████████████████

`bash_read-file      `    6 ████████████████████████████████████

`bash_grep-files     `    4 ████████████████████████

`bash_check-code     `    3 ██████████████████

`bash_list-files     `    1 ██████

`io_prompt_agent_oneshot`    1 ██████


### 💾 Byte Usage

`Input     `    330 KiB ████████████████████████████████████████████████████████████

`Output    `      3 KiB 

`Reasoning `      4 KiB 
**Total:** 338 KiB


### 🎫 Token Usage

`Prompt      `  2,124,966 ████████████████████████████████████████████████████████████

`Completion  `    001,825 ██

`Cached      `  2,592,808 ████████████████████████████████████████████████████████
**Total:** 2,225,791

_(2,592,808 cached)_

---

## 👤 Step 1: User Turn

### 📝 System Prompt

```
You are an expert Haskell and Bash programmer specialized in writing clean, idiomatic, and efficient Haskell code.
When writing Bash code:
- Avoid bash-specific logic but bash-ism are fine.
- Document required shell tools at the top of the bash script.
When writing Haskell code:
- Use modern Haskell practices (base >= 4.14)
- Prefer pure functions and explicit type signatures
- Use standard libraries when appropriate
- Add clear comments for complex logic
- Follow consistent formatting
Use list-files to explore the project structure, read-file to understand existing code, write-file to create or modify files, and check-code to verify your work.
Always compile code before considering the job done.
Your output format may be stored as commit message: hence the first line of your last message should be a summary line.
You have access to a tool which is a copy of yourself named io_prompt_agent_oneshot, use it when a task is well-scoped in a way that it would save tokens in your context window and not interfere with your work.
```

### 💬 User Query

# Replace manual file path dialog with Brick.Widgets.FileBrowser

Depends-on: 
Base-branch: feature/file-browser-widget
Final: false

## Summary

Replace the current manual file path text input dialog (`renderFilePathDialog`) in `src/System/Agents/TUI/Render.hs` with the proper `Brick.Widgets.FileBrowser` widget. This will provide a rich file browsing experience with directory navigation, file search, and visual file selection.

## Current State

The current implementation (`renderFilePathDialog`) provides a basic text editor where users manually type file paths:

```haskell
-- In src/System/Agents/TUI/Render.hs
renderFilePathDialog :: TuiState -> Widget N
renderFilePathDialog st =
    center $
        withAttr dialogAttr $
            borderWithLabel (txt " Attach File (Ctrl+F) ") $
                vBox
                    [ txt "Enter file path (or mime/type;path for explicit type):"
                    , txt ""
                    , hLimit 60 $
                        renderEditor
                            (txt . Text.unlines)
                            True
                            (st ^. tuiUI . filePathInput)
                    , txt ""
                    , txt "Enter: confirm  Esc: cancel"
                    ]
```

**Problems with current approach:**
- Users must know and type exact file paths
- No visual directory navigation
- No file search/filtering capability
- No visual feedback for file types or existence
- Error-prone manual path entry

## Target State

Use `Brick.Widgets.FileBrowser` to provide:
- Visual directory tree navigation with cursor selection
- Built-in search functionality (press `/` to search)
- File type icons/colors based on file type
- Directory entries marked with `/` suffix
- Selected files marked with `*` suffix
- Current working directory header
- File info footer (size, type)
- Keyboard shortcuts: Enter to select, Space to toggle, `/` to search, Esc to cancel

## Implementation Details

### 1. Modify `src/System/Agents/TUI/Types.hs`

Add the FileBrowser to the UI state and update the attachment dialog state:

```haskell
-- Add to imports
import Brick.Widgets.FileBrowser (FileBrowser)

-- Update AttachmentDialogState to support FileBrowser
data AttachmentDialogState
    = AttachmentDialogClosed
    | AttachmentDialogPathInput  -- Keep for backward compatibility
    | AttachmentDialogFileBrowser  -- New: using FileBrowser widget
    deriving (Show, Eq)

-- Add FileBrowser to UIState
-- Note: FileBrowser takes a resource name (WidgetName) as type parameter
data UIState = UIState
    { -- ... existing fields ...
    , _attachmentDialogState :: AttachmentDialogState
    , _fileBrowser :: Maybe (FileBrowser WidgetName)  -- NEW: FileBrowser state
    , _filePathInput :: Editor Text WidgetName  -- Keep for compatibility
    -- ... rest of fields ...
    }

-- Add lens for fileBrowser
makeLenses ''UIState
```

### 2. Modify `src/System/Agents/TUI/Render.hs`

Add the import and update rendering:

```haskell
-- Add to imports
import Brick.Widgets.FileBrowser (
    FileBrowser,
    renderFileBrowser,
    fileBrowserAttr,
    fileBrowserCurrentDirectoryAttr,
    fileBrowserSelectionInfoAttr,
    fileBrowserSelectedAttr,
    fileBrowserDirectoryAttr,
    fileBrowserRegularFileAttr,
    fileExtensionMatch,
    selectNonDirectories,
    )

-- Update tui_appDraw to handle new dialog state
tui_appDraw :: TuiState -> [Widget N]
tui_appDraw st =
    case st ^. tuiUI . attachmentDialogState of
        AttachmentDialogPathInput -> [renderFilePathDialog st, render_ui st]
        AttachmentDialogFileBrowser -> [renderFileBrowserDialog st, render_ui st]  -- NEW
        AttachmentDialogClosed -> [render_ui st]

-- NEW: Render file browser dialog
renderFileBrowserDialog :: TuiState -> Widget N
enderFileBrowserDialog st =
    case st ^. tuiUI . fileBrowser of
        Nothing -> renderFilePathDialog st  -- Fallback to text input if browser not initialized
        Just fb -> 
            center $
                withAttr dialogAttr $
                    borderWithLabel (txt " Attach File (Ctrl+F) ") $
                        vBox
                            [ hLimit 80 $ vLimit 20 $ 
                                renderFileBrowser True fb  -- True = has focus
                            , txt ""
                            , txt "Enter: select file | Space: toggle | /: search | Esc: cancel"
                            ]
```

Also add FileBrowser attributes to `tui_appAttrMap`:

```haskell
tui_appAttrMap :: TuiState -> AttrMap
tui_appAttrMap _ =
    attrMap
        Vty.defAttr
        [ -- ... existing attrs ...
        -- FileBrowser attributes
        , (fileBrowserAttr, Vty.defAttr)
        , (fileBrowserCurrentDirectoryAttr, BrickUtil.fg Vty.cyan)
        , (fileBrowserSelectionInfoAttr, BrickUtil.fg Vty.white `Vty.withStyle` Vty.dim)
        , (fileBrowserSelectedAttr, BrickUtil.bg Vty.blue `Vty.withStyle` Vty.bold)
        , (fileBrowserDirectoryAttr, BrickUtil.fg Vty.blue)
        , (fileBrowserRegularFileAttr, Vty.defAttr)
        -- ... rest ...
        ]
```

### 3. Modify `src/System/Agents/TUI/Event.hs`

Add imports and update event handling:

```haskell
-- Add to imports
import Brick.Widgets.FileBrowser (
    FileBrowser,
    handleFileBrowserEvent,
    fileBrowserCursor,
    fileBrowserSelection,
    fileBrowserException,
    newFileBrowser,
    setFileBrowserEntryFilter,
    actionFileBrowserSelectEnter,
    selectNonDirectories,
    fileExtensionMatch,
    FileInfo,
    fileInfoFilePath,
    fileInfoFileType,
    FileType(..),
    )
import qualified Graphics.Vty as Vty
import qualified Data.ByteString as ByteString
import qualified Data.ByteString.Base64 as Base64
import qualified Data.Text.Encoding as TextEncoding
import System.FilePath (takeFileName)

-- Add lens imports for fileBrowser
import System.Agents.TUI.Types (
    -- ... existing imports ...
    fileBrowser,
    )

-- Update tui_appHandleEvent to handle FileBrowser events
tui_appHandleEvent :: Tracer IO Trace -> BrickEvent N AppEvent -> EventM N TuiState ()
tui_appHandleEvent tracer ev = do
    dialogState <- use (tuiUI . attachmentDialogState)
    case dialogState of
        AttachmentDialogPathInput -> handleFilePathDialogEvent ev
        AttachmentDialogFileBrowser -> handleFileBrowserDialogEvent ev  -- NEW
        AttachmentDialogClosed -> do
            mNavState <- use (tuiUI . turnNavigation)
            case mNavState of
                Just navState -> handleTurnNavigationEvent tracer navState ev
                Nothing -> handleNormalEvent tracer ev
```

Implement the FileBrowser event handler:

```haskell
-- NEW: Handle FileBrowser dialog events
handleFileBrowserDialogEvent :: BrickEvent N AppEvent -> EventM N TuiState ()
handleFileBrowserDialogEvent ev =
    case ev of
        -- Cancel with Esc
        VtyEvent (Vty.EvKey Vty.KEsc []) -> do
            closeFileBrowserDialog
            showStatus StatusInfo "Attachment cancelled"
        
        -- Confirm selection with Enter
        VtyEvent (Vty.EvKey Vty.KEnter []) -> do
            handleFileBrowserSelection
        
        -- Handle FileBrowser-specific events
        VtyEvent vtyEv -> do
            mFb <- use (tuiUI . fileBrowser)
            case mFb of
                Nothing -> pure ()  -- Should not happen
                Just fb -> do
                    -- Handle file browser events (navigation, search, etc.)
                    newFb <- liftIO $ handleFileBrowserEvent vtyEv fb
                    tuiUI . fileBrowser .= Just newFb
        
        _ -> pure ()

-- NEW: Handle file selection from FileBrowser
handleFileBrowserSelection :: EventM N TuiState ()
handleFileBrowserSelection = do
    mFb <- use (tuiUI . fileBrowser)
    case mFb of
        Nothing -> do
            closeFileBrowserDialog
            showStatus StatusError "File browser not initialized"
        Just fb -> do
            -- Get selected file(s) - use fileBrowserSelection for multi-select
            -- or fileBrowserCursor for single cursor position
            case fileBrowserCursor fb of
                Nothing -> do
                    closeFileBrowserDialog
                    showStatus StatusWarning "No file selected"
                Just fileInfo -> do
                    let filePath = fileInfoFilePath fileInfo
                    -- Load the file as MediaAttachment
                    result <- liftIO $ loadFileAsAttachment filePath
                    case result of
                        Left err -> do
                            closeFileBrowserDialog
                            showStatus StatusError $ Text.pack err
                        Right attachment -> do
                            mConv <- getFocusedConversation
                            case mConv of
                                Nothing -> do
                                    closeFileBrowserDialog
                                    showStatus StatusError "No conversation selected"
                                Just conv -> do
                                    let convId = conversationId conv
                                    tuiUI . attachedFiles %= Map.insertWith (\new old -> old ++ new) convId [attachment]
                                    closeFileBrowserDialog
                                    showStatus StatusInfo $ "Attached: " <> maybe "unnamed" id attachment.mediaFilename

-- NEW: Load file as MediaAttachment
loadFileAsAttachment :: FilePath -> IO (Either String MediaAttachment)
loadFileAsAttachment filePath = do
    -- Detect MIME type from extension
    let mimeType = detectMimeType filePath
    -- Read file content
    fileContent <- ByteString.readFile filePath
    let base64Data = TextEncoding.decodeUtf8 $ Base64.encode fileContent
    let filename = Just $ Text.pack $ takeFileName filePath
    pure $ Right $ MediaAttachment mimeType base64Data filename

-- NEW: Simple MIME type detection from file extension
detectMimeType :: FilePath -> Text
detectMimeType fp = 
    let lowerFp = map toLower fp
    in case takeExtension lowerFp of
        ".png" -> "image/png"
        ".jpg" -> "image/jpeg"
        ".jpeg" -> "image/jpeg"
        ".gif" -> "image/gif"
        ".webp" -> "image/webp"
        ".svg" -> "image/svg+xml"
        ".mp3" -> "audio/mp3"
        ".mp4" -> "video/mp4"
        ".pdf" -> "application/pdf"
        ".json" -> "application/json"
        ".txt" -> "text/plain"
        ".md" -> "text/markdown"
        ".html" -> "text/html"
        _ -> "application/octet-stream"

-- NEW: Close file browser dialog and cleanup
closeFileBrowserDialog :: EventM N TuiState ()
closeFileBrowserDialog = do
    tuiUI . attachmentDialogState .= AttachmentDialogClosed
    tuiUI . fileBrowser .= Nothing

-- NEW: Open file browser dialog
openFileBrowserDialog :: EventM N TuiState ()
openFileBrowserDialog = do
    -- Create new file browser with "select non-directories" predicate
    -- This allows navigation into directories but only files are "selectable"
    fb <- liftIO $ newFileBrowser selectNonDirectories FilePathInputWidget Nothing
    -- Optional: Set file filter for common media types
    -- let mediaFilter = Just $ \fi -> case fileInfoFileType fi of
    --         Just Directory -> True  -- Always show directories for navigation
    --         _ -> fileExtensionMatch "png" fi || fileExtensionMatch "jpg" fi ...
    -- fb' = setFileBrowserEntryFilter mediaFilter fb
    tuiUI . fileBrowser .= Just fb
    tuiUI . attachmentDialogState .= AttachmentDialogFileBrowser
```

Update `openFilePathDialog` to optionally use FileBrowser:

```haskell
-- Modify existing openFilePathDialog to open FileBrowser instead
openFilePathDialog :: EventM N TuiState ()
openFilePathDialog = do
    -- Option 1: Replace with FileBrowser
    openFileBrowserDialog
    
    -- Option 2: Keep text input as fallback for specific use cases
    -- tuiUI . attachmentDialogState .= AttachmentDialogPathInput
    -- tuiUI . filePathInput . editContentsL .= TextZipper.textZipper ["/path/to/file.png"] (Just 1)
```

### 4. Update `src/System/Agents/TUI/Core.hs` (if needed)

If there's initialization code, ensure the new `fileBrowser` field is initialized to `Nothing`:

```haskell
initUIState :: [TuiAgent] -> [Session] -> UIState
initUIState agents loadedSessions =
    UIState
        { -- ... existing fields ...
        , _fileBrowser = Nothing  -- NEW
        -- ... rest ...
        }
```

## Key Design Decisions

### File Selection Strategy

Use `selectNonDirectories` as the selection predicate:
- Allows users to navigate into directories (Enter on directory changes into it)
- Only files are "selectable" with Enter/Space
- This is the standard behavior for file pickers

### MIME Type Detection

Implement simple extension-based MIME type detection:
- Covers common image types (PNG, JPEG, GIF, WebP, SVG)
- Covers common document types (PDF, JSON, TXT, MD)
- Falls back to `application/octet-stream` for unknown types
- Can be extended for audio/video types as needed

### Backward Compatibility

Keep `AttachmentDialogPathInput` state:
- Allows users to type explicit paths if needed
- Supports the "mime/type;path" syntax for explicit MIME type specification
- Can be toggled with a keybinding (e.g., Ctrl+T in dialog)

### Error Handling

The FileBrowser handles IOExceptions internally:
- Check `fileBrowserException` after directory changes
- Display error in status bar if exception occurs
- Always shows `..` entry for navigation even on errors

## Testing Checklist

- [ ] Press Ctrl+F opens file browser dialog
- [ ] Can navigate directories with arrow keys
- [ ] Can enter a directory with Enter
- [ ] Can go to parent directory with `..`
- [ ] Can search with `/` key
- [ ] Can select file with Enter
- [ ] Selected file appears as attachment
- [ ] Esc cancels dialog without attachment
- [ ] Error handling for unreadable directories
- [ ] Error handling for unreadable files
- [ ] MIME type detection works for common formats
- [ ] Large directories render efficiently

## Trade-offs and Considerations

### Pros
- Much better user experience with visual navigation
- Built-in search functionality
- Consistent with Brick's design patterns
- Rich visual feedback (file types, sizes, selection state)

### Cons
- Adds dependency on Brick's FileBrowser module (already available in brick-2.11)
- Requires IO for initialization (need `newFileBrowser`)
- Slightly more complex state management
- Default file filter may need tuning for different use cases

### Alternative: Keep Text Input

If full FileBrowser is too heavy, consider enhancing the text input with:
- Tab completion for file paths
- File existence validation
- Path history

However, the full FileBrowser is recommended for best UX.

## References

- [Brick.Widgets.FileBrowser Hackage Docs](https://hackage-content.haskell.org/package/brick-2.11/docs/Brick-Widgets-FileBrowser.html)
- Example usage in `programs/FileBrowserDemo.hs` from brick package
- Current code: `src/System/Agents/TUI/Render.hs` - `renderFilePathDialog`
- Current code: `src/System/Agents/TUI/Event.hs` - `handleFilePathDialogEvent`
- Current code: `src/System/Agents/TUI/Types.hs` - `AttachmentDialogState`, `UIState`

---
From #458



### 🛠️ Available Tools

- **bash_grep-files** (`bash_grep-files`)
  - Description: Search for a pattern in files using 'git grep'
- **bash_read-file** (`bash_read-file`)
  - Description: Read the contents of a file
- **bash_check-code** (`bash_check-code`)
  - Description: Check Haskell code by compiling or testing
- **bash_list-files** (`bash_list-files`)
  - Description: List all files in the project
- **bash_write-file** (`bash_write-file`)
  - Description: Write content to a file. Optionally compiles or tests the code after writing. Use 'none' for the check action when making multiple edits that are not yet final, to avoid redundant compilation.
- **bash_run_agents_exe** (`bash_run_agents_exe`)
  - Description: Runs agents-exe with specified arguments. Useful for testing CLI commands like init, check, run, describe, and running repro cases when bug with specific command arise.
- **io_prompt_agent_oneshot** (`io_prompt_agent_oneshot`)
  - Description: asks a prompt to the expert agent: oneshot

---

## 🤖 Step 2: LLM Turn

### 💭 Thinking Process

<details>
<summary>Click to expand reasoning</summary>

This is a well-specified task to replace a manual file path dialog with Brick's FileBrowser widget. Let me start by exploring the current project structure and understanding the existing code.

I'll need to:
1. List the project files to understand the structure
2. Read the current implementation files
3. Make the necessary changes as specified

Let me start by exploring the project.
</details>

### 💬 Response



### 🔧 Tool Calls

- **bash_list-files**

---

## 👤 Step 3: User Turn



---

## 🤖 Step 4: LLM Turn

### 💭 Thinking Process

<details>
<summary>Click to expand reasoning</summary>

Now let me read the relevant TUI files to understand the current implementation.
</details>

### 💬 Response



### 🔧 Tool Calls

- **bash_read-file**

- **bash_read-file**

- **bash_read-file**

- **bash_read-file**

---

## 👤 Step 5: User Turn



---

## 🤖 Step 6: LLM Turn

### 💭 Thinking Process

<details>
<summary>Click to expand reasoning</summary>

Now I have a good understanding of the codebase. Let me implement the changes as specified in the task. I need to:

1. Modify `src/System/Agents/TUI/Types.hs` - Add FileBrowser support and new dialog state
2. Modify `src/System/Agents/TUI/Render.hs` - Add rendering for FileBrowser dialog
3. Modify `src/System/Agents/TUI/Event.hs` - Add event handling for FileBrowser
4. Update `src/System/Agents/TUI/Core.hs` - If needed

Let me start implementing these changes.
</details>

### 💬 Response

Now I have a good understanding of the current implementation. Let me implement the FileBrowser widget replacement as specified. I'll start by updating the types, then the rendering, and finally the event handling.

### 🔧 Tool Calls

- **bash_write-file**

---

## 👤 Step 7: User Turn



---

## 🤖 Step 8: LLM Turn

### 💭 Thinking Process

<details>
<summary>Click to expand reasoning</summary>

Good, the types are updated. Now let me update the Render module to add the FileBrowser dialog rendering and attributes.
</details>

### 💬 Response



### 🔧 Tool Calls

- **bash_write-file**

---

## 👤 Step 9: User Turn



---

## 🤖 Step 10: LLM Turn

### 💭 Thinking Process

<details>
<summary>Click to expand reasoning</summary>

Now let me update the Event module to add FileBrowser event handling. This is the most complex part - I need to:
1. Add imports for FileBrowser
2. Handle the new AttachmentDialogFileBrowser state
3. Implement handleFileBrowserDialogEvent
4. Implement file loading from FileBrowser selection
5. Update openFilePathDialog to use the FileBrowser
</details>

### 💬 Response

Now let me update the Event module to add the FileBrowser event handling:

### 🔧 Tool Calls

- **bash_write-file**

---

## 👤 Step 11: User Turn



---

## 🤖 Step 12: LLM Turn

### 💭 Thinking Process

<details>
<summary>Click to expand reasoning</summary>

Now let me update the Core.hs file to re-export the fileBrowser lens and verify the implementation compiles.
</details>

### 💬 Response

Now let me update the Core.hs to re-export the new `fileBrowser` lens:

### 🔧 Tool Calls

- **bash_write-file**

---

## 👤 Step 13: User Turn



---

## 🤖 Step 14: LLM Turn

### 💭 Thinking Process

<details>
<summary>Click to expand reasoning</summary>

Now let me compile the code to verify everything is correct.
</details>

### 💬 Response

Now let's compile the code to verify everything is correct:

### 🔧 Tool Calls

- **bash_check-code**

---

## 👤 Step 15: User Turn



---

## 🤖 Step 16: LLM Turn

### 💭 Thinking Process

<details>
<summary>Click to expand reasoning</summary>

I have two issues to fix:
1. Unused import of `FileBrowser` in Render.hs
2. Missing `Text` type in scope in Event.hs - need to import `Data.Text (Text)`

Let me fix these issues.
</details>

### 💬 Response

I need to fix two compilation errors. Let me update the files:

### 🔧 Tool Calls

- **bash_write-file**

---

## 👤 Step 17: User Turn



---

## 🤖 Step 18: LLM Turn

### 💭 Thinking Process

<details>
<summary>Click to expand reasoning</summary>

Now I need to fix the Event.hs file to add the `Text` type import. Let me update the import section.
</details>

### 💬 Response



### 🔧 Tool Calls

- **bash_read-file**

---

## 👤 Step 19: User Turn



---

## 🤖 Step 20: LLM Turn

### 💭 Thinking Process

<details>
<summary>Click to expand reasoning</summary>

The issue is that `detectMimeType :: FilePath -> Text` requires the `Text` type but we're using `qualified Data.Text as Text`. I need to change the signature to use `Text.Text` or import `Text` unqualified. Let me make a quick fix to the Event.hs file.
</details>

### 💬 Response

I need to fix the type signature for `detectMimeType` to use the qualified import:

### 🔧 Tool Calls

- **bash_write-file**

---

## 👤 Step 21: User Turn



---

## 🤖 Step 22: LLM Turn

### 💭 Thinking Process

<details>
<summary>Click to expand reasoning</summary>

I made a mistake. I need to read the file again and replace just that function. Let me do it properly.
</details>

### 💬 Response

I need to do a proper replacement. Let me use sed to fix just that line:

### 🔧 Tool Calls

- **bash_grep-files**

---

## 👤 Step 23: User Turn



---

## 🤖 Step 24: LLM Turn

### 💭 Thinking Process

<details>
<summary>Click to expand reasoning</summary>

Hmm, the grep didn't find it. Let me try again with a different pattern.
</details>

### 💬 Response



### 🔧 Tool Calls

- **bash_grep-files**

---

## 👤 Step 25: User Turn



---

## 🤖 Step 26: LLM Turn

### 💭 Thinking Process

<details>
<summary>Click to expand reasoning</summary>

Good, the file already has `Text.Text`. So the issue was already fixed. Let me compile again.
</details>

### 💬 Response

The file already has the correct type signature. Let me compile again:

### 🔧 Tool Calls

- **bash_check-code**

---

## 👤 Step 27: User Turn



---

## 🤖 Step 28: LLM Turn

### 💭 Thinking Process

<details>
<summary>Click to expand reasoning</summary>

Ah, I made a mistake - I overwrote the entire file with just that function instead of replacing just that line. Let me restore the full file by reading the original and fixing just that line.
</details>

### 💬 Response

I accidentally overwrote the file. Let me restore it properly:

### 🔧 Tool Calls

- **bash_write-file**

---

## 👤 Step 29: User Turn



---

## 🤖 Step 30: LLM Turn

### 💭 Thinking Process

<details>
<summary>Click to expand reasoning</summary>

I see the issue - `handleFileBrowserEvent` from Brick doesn't return `IO (FileBrowser n)`, it actually works in `EventM`. Let me check the Brick API and fix this. The function signature is:
`handleFileBrowserEvent :: Event -> EventM n (FileBrowser n) ()`

This means it takes an event and operates in the EventM monad, modifying the browser state. I need to handle this differently - the FileBrowser is a stateful widget that gets modified via EventM actions.

Looking at the Brick API more carefully, I see that `handleFileBrowserEvent` actually works within the EventM monad. The proper way to handle this is to use `Brick.zoom` to focus on the fileBrowser lens and then call handleFileBrowserEvent.

Actually, looking at the types again:
- `newFileBrowser` returns `IO (FileBrowser n)` - this needs liftIO
- `handleFileBrowserEvent` returns `EventM n (FileBrowser n) ()` - this works in EventM directly

So I shouldn't use `liftIO` for `handleFileBrowserEvent`, I should use it directly within the `EventM N TuiState ()` context via zoom.
</details>

### 💬 Response

I see the issue. `handleFileBrowserEvent` from Brick works in `EventM`, not `IO`. Let me fix this:

### 🔧 Tool Calls

- **bash_grep-files**

---

## 👤 Step 31: User Turn



---

## 🤖 Step 32: LLM Turn

### 💭 Thinking Process

<details>
<summary>Click to expand reasoning</summary>

I need to fix the event handling for the FileBrowser. The issue is that `handleFileBrowserEvent` has type `Event -> EventM n (FileBrowser n) ()`, so it doesn't return the new browser state - it modifies it in place within the EventM monad.

Looking at Brick's FileBrowser more carefully:
- The FileBrowser is managed as state within EventM
- `handleFileBrowserEvent` operates on the FileBrowser state

Since we store the FileBrowser in `TuiState` as `Maybe (FileBrowser WidgetName)`, I need to use `zoom` to focus on that field and then call the handler. But since it's `Maybe`, I need to handle that.

Let me update the code to properly handle the FileBrowser events by using zoom.
</details>

### 💬 Response



### 🔧 Tool Calls

- **bash_write-file**

---

## 👤 Step 33: User Turn



---

## 🤖 Step 34: LLM Turn

### 💭 Thinking Process

<details>
<summary>Click to expand reasoning</summary>

I need to import the `_Just` prism from lens or microlens. Let me add the import for it.
</details>

### 💬 Response

I need to add the import for `_Just`:

### 🔧 Tool Calls

- **bash_grep-files**

---

## 👤 Step 35: User Turn



---

## 🤖 Step 36: LLM Turn

### 💭 Thinking Process

<details>
<summary>Click to expand reasoning</summary>

I need to add `_Just` to the Control.Lens import in Event.hs. Let me update it.
</details>

### 💬 Response



### 🔧 Tool Calls

- **bash_write-file**

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## 👤 Step 37: User Turn



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## 🤖 Step 38: LLM Turn

### 💭 Thinking Process

<details>
<summary>Click to expand reasoning</summary>

I accidentally overwrote the file again. Let me write the full file again with the correct import.
</details>

### 💬 Response

I need to restore the full file with the correct import:

### 🔧 Tool Calls

- **bash_read-file**

---

## 👤 Step 39: User Turn



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## 🤖 Step 40: LLM Turn

### 💭 Thinking Process

<details>
<summary>Click to expand reasoning</summary>

The file got truncated. I need to restore the full content. Let me write it again.
</details>

### 💬 Response

Let me restore the full file properly by using write-file with the complete content from before but with the fixed import:

### 🔧 Tool Calls

- **bash_write-file**

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## 👤 Step 41: User Turn



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## 🤖 Step 42: LLM Turn

### 💭 Thinking Process

<details>
<summary>Click to expand reasoning</summary>

Almost there - just a warning about unused import being treated as error. Let me remove the unused FileBrowser import.
</details>

### 💬 Response

Just need to remove the unused import:

### 🔧 Tool Calls

- **io_prompt_agent_oneshot**

---

## 👤 Step 43: User Turn



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## 🤖 Step 44: LLM Turn

### 💭 Thinking Process

<details>
<summary>Click to expand reasoning</summary>

Let me verify the code compiles now.
</details>

### 💬 Response



### 🔧 Tool Calls

- **bash_check-code**

---

## 👤 Step 45: User Turn



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## 🤖 Step 46: LLM Turn

### 💭 Thinking Process

<details>
<summary>Click to expand reasoning</summary>

The code compiles successfully. Let me provide a summary of the changes made.
</details>

### 💬 Response

The code compiles successfully. Let me provide a summary of the implementation:

## Summary

Successfully replaced the manual file path dialog with `Brick.Widgets.FileBrowser` widget in the TUI application. Here are the changes made:

### 1. `src/System/Agents/TUI/Types.hs`
- Added `FileBrowser` import from `Brick.Widgets.FileBrowser`
- Added new `AttachmentDialogFileBrowser` constructor to `AttachmentDialogState` enum
- Added `_fileBrowser :: Maybe (FileBrowser WidgetName)` field to `UIState`
- Added `fileBrowser` lens
- Initialized `_fileBrowser = Nothing` in `initUIState`

### 2. `src/System/Agents/TUI/Render.hs`
- Added imports for FileBrowser rendering functions and attributes
- Added `renderFileBrowserDialog` function to render the file browser dialog
- Updated `tui_appDraw` to handle the new `AttachmentDialogFileBrowser` state
- Added FileBrowser-specific attributes to `tui_appAttrMap`:
  - `fileBrowserAttr`
  - `fileBrowserCurrentDirectoryAttr`
  - `fileBrowserSelectionInfoAttr`
  - `fileBrowserSelectedAttr`
  - `fileBrowserDirectoryAttr`
  - `fileBrowserRegularFileAttr`

### 3. `src/System/Agents/TUI/Event.hs`
- Added imports for FileBrowser event handling functions
- Added `_Just` import from `Control.Lens` for zooming into Maybe fields
- Added `handleFileBrowserDialogEvent` function to handle FileBrowser events:
  - `Esc` - closes dialog
  - `Enter` - selects the file at cursor
  - Other keys - navigation, search (`/`), etc.
- Added `handleFileBrowserSelection` to load selected file as attachment
- Added `loadFileAsAttachment` to read files and detect MIME types
- Added `detectMimeType` function with support for 30+ file extensions
- Added `closeFileBrowserDialog` and `openFileBrowserDialog` functions
- Modified `openFilePathDialog` to now use FileBrowser instead of text input
- Kept legacy text input code for backward compatibility

### 4. `src/System/Agents/TUI/Core.hs`
- Added `fileBrowser` lens export

### Key Features
- **Visual directory navigation** with cursor selection
- **Built-in search** (press `/` to search)
- **File type icons/colors** based on file type  
- **Directory entries** marked appropriately
- **Keyboard shortcuts**: Enter to select, Space to toggle, `/` to search, Esc to cancel
- **MIME type detection** for 30+ file formats (images, audio, video, documents, code files)
- **Backward compatibility** - text input code kept as fallback
