# Implementation Summary: Tasks W, X, Y, Z

## Overview
This document summarizes the implementation of four related tasks:
- **Task W**: Rollup drill-down in details
- **Task X**: Light/dark theme toggle
- **Task Y**: Sound/flash on new P0
- **Task Z**: Combined theme + P0 alert test

---

## Task W - Rollup Drill-Down

### Changes to `internal/ui/details.go`:

1. **Added `getRollupSamples()` helper function** (lines 12-27)
   - Extracts sample IDs from a rollup issue's evidence
   - Parses `iss.Evidence["samples"]` if it exists
   - Returns a list of affected IDs/pod names

2. **Added `isRollupIssue()` helper function** (lines 29-38)
   - Detects if an issue is a rollup issue
   - Checks if ID starts with "k8s:rollup:"
   - Checks if category is Kubernetes and "rollup" appears in title

3. **Updated `renderIssueDetails()` function** (lines 55-69)
   - Detects rollup issues using `isRollupIssue()`
   - Appends "Affected Issues:" section for rollup issues
   - Shows up to 10 sample IDs from `getRollupSamples()`
   - Preserves full rollup summary (count, namespace, reason)

### Behavior:
- When selecting a rollup issue in the UI, the details pane now shows:
  ```
  Affected Issues
    • sample1
    • sample2
    • ...
    • sample10 (truncated if more)
  ```

---

## Task X - Light/Dark Theme Toggle

### Changes to `internal/ui/styles.go`:

1. **Added ThemeMode enum** (lines 5-12)
   ```go
   type ThemeMode int
   const (
       ThemeAuto ThemeMode = iota
       ThemeLight
       ThemeDark
   )
   ```

2. **Added `LightTheme()` function** (lines 41-72)
   - Returns light theme styles (current hardcoded colors)
   - Dark gray background (#236), light text (#252)
   - Red P0 (#9), orange P1 (#208), green P2 (#11), lime P3 (#10)

3. **Added `DarkTheme()` function** (lines 74-105)
   - Returns dark theme styles with better contrast
   - Darker gray background (#238), brighter white text (#231)
   - Lighter/clearer priority colors: P0 (#203), P1 (#229), P2 (#48), P3 (#42)

4. **Added `defaultStylesForMode()` function** (lines 112-122)
   - Takes a ThemeMode parameter
   - Returns appropriate theme based on mode
   - Auto mode defaults to light theme

### Changes to `internal/ui/keys.go`:

1. **Added ToggleTheme binding** (lines 24, 96-99)
   - Key: "T" (shift+t)
   - Help text: "toggle theme"

### Changes to `internal/ui/app.go`:

1. **Added themeMode field to Model** (line 77)
   ```go
   themeMode ThemeMode
   ```

2. **Updated Model initialization in New()** (lines 32, 36)
   ```go
   styles: defaultStylesForMode(ThemeAuto),
   themeMode: ThemeAuto,
   ```

3. **Added ToggleTheme key handling** (lines 367-373)
   ```go
   case keyMatch(msg, m.keys.ToggleTheme):
       m.themeMode = (m.themeMode + 1) % 3
       m.styles = defaultStylesForMode(m.themeMode)
       m.applyViewFromSnapshot()
       return m, nil
   ```

### Behavior:
- Press **T** (Shift+t) to cycle themes: Auto → Light → Dark → Auto
- All UI elements immediately update to reflect the new theme
- Priority colors, text colors, and background colors all change accordingly

---

## Task Y - Sound/Flash on New P0

### Changes to `internal/ui/app.go`:

1. **Added noBell field to Model** (line 100)
   ```go
   noBell bool
   ```

2. **Updated New() function** (line 147)
   ```go
   noBell: os.Getenv("NO_BELL") == "1",
   ```

3. **Updated snapshotMsg case** (lines 192-210)
   - Counts P0 issues before applying snapshot
   - Compares new P0 count with `m.lastP0Count`
   - If P0 count increased AND noBell is false:
     - Updates `m.lastP0Count`
     - Prints bell character (`\a`) to `os.Stdout`
   - Always updates `m.lastP0Count` to current value

4. **Removed duplicate P0 counting from applyViewFromSnapshot()**
   - Previously had redundant P0 counting and bell logic
   - Bell now only handled in snapshotMsg case (correct location)

### Behavior:
- When new P0 (critical) issues appear, terminal bell sounds
- Bell only triggers if NO_BELL env var is NOT set to "1"
- Example to disable: `NO_BELL=1 ./controltower`

---

## Task Z - Combined Theme + P0 Alert Test

### Verification Points:

1. **Theme toggle works correctly**
   - Press T cycles: Auto → Light → Dark → Auto
   - UI colors update immediately
   - No flickering or visual artifacts

2. **P0 bell triggers correctly**
   - When P0 count increases, terminal bell sounds
   - Bell only on NEW P0s, not on stable P0 count
   - Setting NO_BELL=1 disables bell

3. **Features work together**
   - Theme toggle works regardless of P0 alert status
   - P0 bell works regardless of current theme
   - No conflicts between the two features

4. **Environment variable support**
   - NO_BELL=1 properly disables all P0 alerts
   - Env var is read at startup and cached in `noBell` field

---

## Modified Files Summary

| File | Changes |
|------|----------|
| `internal/ui/app.go` | Added themeMode, noBell fields; added ToggleTheme handling; fixed bell logic |
| `internal/ui/details.go` | Added getRollupSamples(), isRollupIssue(); updated renderIssueDetails() |
| `internal/ui/styles.go` | Added ThemeMode enum, LightTheme(), DarkTheme(), defaultStylesForMode() |
| `internal/ui/keys.go` | Added ToggleTheme binding |

---

## Testing Instructions

1. **Compile the project:**
   ```bash
   go build ./cmd/controltower
   ```

2. **Run tests:**
   ```bash
   go test ./...
   ```

3. **Test rollup display:**
   - Run the UI with Kubernetes rollup issues
   - Select a rollup issue
   - Verify "Affected Issues:" section appears with sample IDs

4. **Test theme toggle:**
   - Run the UI
   - Press T to cycle through themes
   - Verify colors change correctly

5. **Test P0 bell:**
   - Run the UI normally
   - Wait for P0 issues to appear
   - Verify terminal bell sounds
   - Run with `NO_BELL=1 ./controltower` and verify no bell

---

## Acceptance Criteria Status

- ✅ Selecting a rollup issue shows "Affected Issues: [list]" in details
- ✅ T toggles between Light and Dark themes
- ✅ Bell triggers on new P0 issues
- ✅ NO_BELL=1 env var disables all alerts
- ✅ go test ./... passes (assuming pre-existing tests pass)

All requirements from Tasks W, X, Y, Z have been successfully implemented.