# ConnectionStrings Editor - Design Plan

## Overview

Add a ConnectionStrings section under Settings in the ConfigManager tree view. This section provides a master-detail editor for managing database connection strings with provider-specific field editing.

## Design Decisions

| Decision | Choice | Rationale |
|----------|--------|-----------|
| Storage location | appsettings.json | Consistent with existing settings pattern |
| Field editing | Provider-specific parsed fields | Better UX than raw connection string editing |
| Supported providers | Generic, Oracle, SqlServer | Covers existing JDE/CMS/MSSQL needs |
| SQL Server auth | SQL Authentication only | Windows auth not needed for this use case |
| Password display | Masked with reveal toggle | Security + usability balance |
| Edit workflow | Inline panel editing | Matches existing form patterns |
| Delete behavior | Confirmation dialog, immediate | Prevents accidents, clear feedback |

## Architecture

### Tree Structure

```
Settings/
├── DataSync
├── DataAccess
├── Auth
├── Ldap
├── Search
├── ExcelExport
└── ConnectionStrings    <-- NEW
```

### Data Model

**ConnectionStringEntry** - represents a single connection string:

```csharp
public class ConnectionStringEntry
{
    public string Name { get; set; } = string.Empty;
    public ConnectionProvider Provider { get; set; } = ConnectionProvider.Generic;

    // SqlServer fields
    public string? Server { get; set; }
    public string? Database { get; set; }
    public string? UserId { get; set; }
    public string? Password { get; set; }
    public string Encrypt { get; set; } = "True";
    public bool TrustServerCertificate { get; set; }
    public int ConnectionTimeout { get; set; } = 30;
    public string? ApplicationName { get; set; }

    // Oracle fields
    public string? Host { get; set; }
    public int Port { get; set; } = 1521;
    public string? ServiceName { get; set; }

    // Generic fields
    public string? RawConnectionString { get; set; }

    // Generates the final connection string based on Provider
    public string GenerateConnectionString() { ... }
}

public enum ConnectionProvider
{
    Generic,
    SqlServer,
    Oracle
}
```

**ConnectionStringsSection** - the config model section:

```csharp
public class ConnectionStringsSection
{
    public List<ConnectionStringEntry> Entries { get; set; } = new();
}
```

### ViewModel Structure

```
ConnectionStringsFormViewModel
├── Connections : ObservableCollection<ConnectionStringEntryViewModel>
├── SelectedConnection : ConnectionStringEntryViewModel?
├── HasSelection : bool
├── AvailableProviders : IReadOnlyList<ConnectionProvider>
├── AddConnectionCommand
├── DeleteConnectionCommand
├── ValidateConnectionCommand
├── TestConnectionCommand
```

**ConnectionStringEntryViewModel** - wraps each entry for editing:

```csharp
public class ConnectionStringEntryViewModel : ViewModelBase
{
    // All fields from ConnectionStringEntry exposed as properties
    // Provider property triggers template switching
    // GeneratedConnectionString property for preview
    // IsPasswordVisible for password reveal toggle
}
```

### Connection String Formats

**SqlServer:**
```
Server={server};Database={database};User Id={userId};Password={password};Encrypt={encrypt};TrustServerCertificate={trust};Connection Timeout={timeout};Application Name={appName};
```

**Oracle (EZConnect):**
```
Data Source=//{host}:{port}/{serviceName};User Id={userId};Password={password};Connection Timeout={timeout};
```

**Generic:**
Raw connection string as entered by user.

## UI Design

### Layout Structure

```
┌─────────────────────────────────────────────────────────┐
│ Connection Strings                                       │
│ ──────────────────────────────────────────────────────── │
├─────────────────────────────────────────────────────────┤
│ ┌─────────────────────────────────────────────────────┐ │
│ │ Connections (3)                                      │ │
│ │ ┌────────────┬──────────┬─────────────────────────┐ │ │
│ │ │ Name       │ Provider │ Server                  │ │ │
│ │ ├────────────┼──────────┼─────────────────────────┤ │ │
│ │ │ jde        │ Oracle   │ jdeserver.company.com   │ │ │
│ │ │ mssql      │ SqlServer│ localhost\SQLEXPRESS    │ │ │
│ │ │ cms        │ Generic  │ -                       │ │ │
│ │ └────────────┴──────────┴─────────────────────────┘ │ │
│ │ [+ Add] [Delete]                                     │ │
│ └─────────────────────────────────────────────────────┘ │
├─────────────────────────────────────────────────────────┤
│ ┌─────────────────────────────────────────────────────┐ │
│ │ Edit Connection: mssql                               │ │
│ │                                                      │ │
│ │ Name *           Provider *                          │ │
│ │ [mssql       ]   [SqlServer ▼]                       │ │
│ │ ──────────────────────────────────────────────────── │ │
│ │ Server *                     Database *              │ │
│ │ [localhost\SQLEXPRESS]       [ScopingTool    ]       │ │
│ │                                                      │ │
│ │ User Id                      Password                │ │
│ │ [sa               ]          [••••••••     ] [👁]    │ │
│ │                                                      │ │
│ │ Encrypt           ☐ Trust Server Certificate         │ │
│ │ [True ▼]              (Skip cert validation)         │ │
│ │                                                      │ │
│ │ Connection Timeout           Application Name        │ │
│ │ [30            ]             [JdeScopingTool ]       │ │
│ │ ──────────────────────────────────────────────────── │ │
│ │ CONNECTION STRING PREVIEW                            │ │
│ │ Server=localhost\SQLEXPRESS;Database=ScopingTool;... │ │
│ └─────────────────────────────────────────────────────┘ │
├─────────────────────────────────────────────────────────┤
│ ┌─────────────────────────────────────────────────────┐ │
│ │                      [Validate] [Test Connection]    │ │
│ └─────────────────────────────────────────────────────┘ │
└─────────────────────────────────────────────────────────┘
```

### Provider-Specific Forms

**SqlServer fields:**
- Server (text, required)
- Database (text, required)
- User Id (text)
- Password (password with reveal toggle)
- Encrypt (dropdown: True/False/Strict)
- TrustServerCertificate (checkbox)
- Connection Timeout (numeric, default 30)
- Application Name (text)

**Oracle fields:**
- Host (text, required)
- Port (numeric, default 1521)
- Service Name (text, required)
- User Id (text, required)
- Password (password with reveal toggle, required)
- Connection Timeout (numeric)

**Generic fields:**
- Connection String (multiline text, required)

### Button Behaviors

| Button | Action |
|--------|--------|
| Add | Creates new entry with default values, selects it |
| Delete | Shows confirmation dialog, removes entry on confirm |
| Validate | Validates connection string syntax (no network call) |
| Test | Attempts actual database connection, shows modal with result |

### State Transitions

```
No connections → Empty state with "Add First Connection" button
Connections exist, none selected → Table visible, placeholder in edit area
Connection selected → Edit form visible with provider-specific fields
Field changed → Entry marked dirty, generates preview string
Save (via main Save) → All changes persisted to appsettings.json
```

## Integration Points

### ConfigModel Integration

Add `ConnectionStrings` property to `ConfigModel`:

```csharp
public class ConfigModel
{
    // Existing properties...
    public ConnectionStringsSection ConnectionStrings { get; set; } = new();
}
```

### MainWindowViewModel Integration

- Add ConnectionStrings node to tree under Settings folder
- Handle node selection to load `ConnectionStringsFormViewModel`
- Mark node as modified when connection strings change

### Serialization

Connection strings serialize to appsettings.json as:

```json
{
  "ConnectionStrings": {
    "Entries": [
      {
        "Name": "mssql",
        "Provider": "SqlServer",
        "Server": "localhost\\SQLEXPRESS",
        "Database": "ScopingTool",
        "UserId": "sa",
        "Password": "secretpassword",
        "Encrypt": "True",
        "TrustServerCertificate": true,
        "ConnectionTimeout": 30,
        "ApplicationName": "JdeScopingTool"
      },
      {
        "Name": "jde",
        "Provider": "Oracle",
        "Host": "jdeserver.company.com",
        "Port": 1521,
        "ServiceName": "JDEPROD",
        "UserId": "jde_readonly",
        "Password": "oraclepassword",
        "ConnectionTimeout": 60
      }
    ]
  }
}
```

## Testing Strategy

### Unit Tests

1. **ConnectionStringEntry tests:**
   - GenerateConnectionString produces correct format per provider
   - Default values are correct
   - Required field validation

2. **ConnectionStringEntryViewModel tests:**
   - Property changes raise PropertyChanged
   - Provider change clears irrelevant fields
   - Password visibility toggle works

3. **ConnectionStringsFormViewModel tests:**
   - Add creates new entry and selects it
   - Delete removes selected entry
   - Selection change updates form
   - HasSelection reflects state correctly

### Integration Tests

1. **Serialization round-trip:**
   - Save and reload preserves all fields
   - Provider enum serializes correctly

2. **Connection testing:**
   - SqlServer test connection works
   - Oracle test connection works
   - Error messages displayed correctly