# Discharge Summary HTML Editor Fix

## Problem
After converting textarea controls to HTML editors (TinyMCE/similar) in the discharge form, saved discharge summaries were not appearing in the generated PDF.

## Root Cause
The `normalizeRichText()` function at line 1591 in `Ipd_discharge.php` was stripping ALL HTML tags using `strip_tags()`. This was designed for plain textarea input, but when HTML editors save formatted content with `<p>`, `<b>`, `<div>`, `<ul>`, etc., all the markup was being removed, leaving empty or malformed content.

## Affected Fields
- Presenting Complaints (complaint_remark)
- Final Diagnosis (diagnosis_remark)  
- Course in Hospital (course_remark)
- Summary of Key Investigations (inhos_remark)
- Other/Systemic Examinations (systemic exam text)
- Other Examinations/Provisional Diagnosis (other_exam_text)

## Solution
Modified the following methods in `app/Controllers/Ipd_discharge.php`:

### 1. Enhanced `normalizeRichText()` (line 1591)
- Detects if content contains HTML tags from HTML editor
- **If HTML detected**: Preserves HTML structure, only cleans whitespace
- **If plain text**: Uses original logic (strip tags, convert to plain text)
- Backward compatible with existing plain textarea fields

### 2. Added `renderRichText()` (new method after normalizeRichText)
- Detects HTML vs plain text content
- **If HTML**: Returns content as-is for HTML rendering
- **If plain text**: Applies `esc()` and `nl2br()` for safe output

### 3. Updated rendering methods
- `buildNarrativeSection()`: Changed `nl2br(esc($remark))` to `$this->renderRichText($remark)`
- Systemic exam section: Changed `nl2br(esc($value))` to `$this->renderRichText($value)`
- Other exam section: Changed `nl2br(esc($otherExamText))` to `$this->renderRichText($otherExamText)`
- Key investigations section: Changed `nl2br(esc($inhosRemark))` to `$this->renderRichText($inhosRemark)`

## Changes Made
```
File: app/Controllers/Ipd_discharge.php
- Line ~1591: Enhanced normalizeRichText() to preserve HTML
- Line ~1625: Added new renderRichText() helper method
- Line ~1768: Updated buildNarrativeSection() to use renderRichText()
- Line ~1932: Updated systemic exam rendering to use renderRichText()
- Line ~2094: Updated other exam rendering to use renderRichText()
- Line ~2113: Updated key investigations rendering to use renderRichText()
```

## Testing
1. Open discharge form: `/Ipd_discharge/ipd_select/1007170`
2. Verify HTML editor content is saved correctly
3. Preview discharge PDF
4. Check that formatted content (bold, lists, paragraphs) appears correctly
5. Test with both HTML editor and plain textarea fields (backward compatibility)

## Backward Compatibility
✅ Existing plain textarea fields continue to work
✅ HTML editor fields now render correctly
✅ No database changes required
✅ Automatic detection of content type (HTML vs plain text)

## Security
- HTML editor content is NOT escaped (assumes HTML editor provides safe content)
- Plain text content continues to be escaped with `esc()` function
- No XSS risk if HTML editor properly sanitizes input