# Gemini Flag Integration Architecture
## Complete System Design for --gemini Flag Implementation

### 🎯 Executive Summary

This document defines the complete architecture for implementing the `--gemini` flag integration across all commands in gemini-flow, providing seamless context loading, environment detection, and enhanced AI coordination capabilities.

### 📋 Architecture Decision Record (ADR)

**Decision**: Implement global `--gemini` flag with centralized integration service and command-level coordination
**Context**: Need to provide enhanced AI capabilities when Gemini CLI is available while maintaining fallback compatibility
**Consequences**: 
- ✅ Consistent behavior across all commands
- ✅ Automatic environment detection and configuration
- ✅ Graceful degradation when Gemini CLI unavailable
- ⚠️ Additional complexity in command initialization

---

## 🏗️ System Architecture Overview

### Core Components

```mermaid
graph TB
    A[CLI Entry Point] --> B[Global Flag Handler]
    B --> C[GeminiIntegrationService]
    C --> D[Environment Detector]
    C --> E[Context Loader]
    C --> F[MCP Bridge]
    
    G[Command Registry] --> H[BaseCommand]
    H --> I[GeminiAwareCommand]
    I --> J[Command Implementation]
    
    B --> G
    C --> K[Context Cache]
    C --> L[Configuration Manager]
    
    subgraph "Integration Layer"
        D
        E
        F
        K
        L
    end
    
    subgraph "Command Layer"
        G
        H
        I
        J
    end
```

---

## 🔧 Component Specifications

### 1. GeminiIntegrationService (Enhanced)

```typescript
export interface GeminiIntegrationConfig {
  enableAutoDetection: boolean;
  contextCacheTimeout: number;
  fallbackBehavior: 'graceful' | 'strict' | 'warn';
  verboseLogging: boolean;
  mcpToolsEnabled: boolean;
}

export interface GeminiIntegrationResult {
  status: 'success' | 'partial' | 'failed';
  detection: {
    cliInstalled: boolean;
    version?: string;
    path?: string;
    mcpToolsAvailable: boolean;
  };
  context: {
    loaded: boolean;
    source: 'GEMINI.md' | 'fallback' | 'cache';
    size: number;
    timestamp: Date;
  };
  environment: {
    configured: boolean;
    variables: Record<string, string>;
    toolsRegistered: string[];
  };
  capabilities: {
    enhancedCoordination: boolean;
    contextAwareness: boolean;
    mcpIntegration: boolean;
  };
}

export class GeminiIntegrationService {
  private config: GeminiIntegrationConfig;
  private integrationCache: Map<string, GeminiIntegrationResult>;
  private mcpToolRegistry: MCPToolRegistry;
  
  async initializeGlobal(config?: Partial<GeminiIntegrationConfig>): Promise<GeminiIntegrationResult>;
  async detectCapabilities(): Promise<GeminiCapabilities>;
  async loadContextForCommand(commandName: string): Promise<CommandContext>;
  async registerMCPTools(): Promise<MCPToolRegistration>;
  async enableEnhancedCoordination(): Promise<void>;
  
  // Command-specific integration
  async integrateCommand(command: BaseCommand): Promise<void>;
  async wrapCommandExecution<T>(command: string, args: string[], executor: () => Promise<T>): Promise<T>;
}
```

### 2. GlobalFlagHandler

```typescript
export interface GlobalFlags {
  gemini: boolean;
  verbose: boolean;
  profile?: string;
  [key: string]: any;
}

export class GlobalFlagHandler {
  private integrationService: GeminiIntegrationService;
  private flagProcessors: Map<string, FlagProcessor>;
  
  constructor(integrationService: GeminiIntegrationService) {
    this.integrationService = integrationService;
    this.setupFlagProcessors();
  }
  
  async processGlobalFlags(args: string[]): Promise<ProcessedFlags> {
    const flags = this.parseFlags(args);
    
    if (flags.gemini) {
      await this.handleGeminiFlag(flags);
    }
    
    return {
      processed: flags,
      environment: this.buildEnvironment(flags),
      context: await this.loadCommandContext(flags)
    };
  }
  
  private async handleGeminiFlag(flags: GlobalFlags): Promise<void> {
    const spinner = ora('Initializing Gemini integration...').start();
    
    try {
      const result = await this.integrationService.initializeGlobal({
        verboseLogging: flags.verbose,
        enableAutoDetection: true,
        fallbackBehavior: 'graceful'
      });
      
      if (result.status === 'success') {
        spinner.succeed('Gemini integration activated');
        if (flags.verbose) {
          this.displayIntegrationStatus(result);
        }
      } else {
        spinner.warn('Gemini integration partial');
        if (flags.verbose) {
          this.displayWarnings(result);
        }
      }
      
      // Configure global environment
      this.configureGlobalEnvironment(result);
      
    } catch (error) {
      spinner.fail('Gemini integration failed');
      this.handleIntegrationError(error, flags.verbose);
    }
  }
  
  private configureGlobalEnvironment(result: GeminiIntegrationResult): void {
    process.env.GEMINI_FLOW_INTEGRATED = 'true';
    process.env.GEMINI_FLOW_STATUS = result.status;
    process.env.GEMINI_FLOW_CAPABILITIES = JSON.stringify(result.capabilities);
    
    if (result.detection.cliInstalled) {
      process.env.GEMINI_CLI_AVAILABLE = 'true';
      process.env.GEMINI_CLI_VERSION = result.detection.version || 'unknown';
    }
    
    if (result.context.loaded) {
      process.env.GEMINI_CONTEXT_LOADED = 'true';
      process.env.GEMINI_CONTEXT_SOURCE = result.context.source;
    }
  }
}
```

### 3. Enhanced BaseCommand Interface

```typescript
export interface GeminiAwareCommand extends Command {
  geminiIntegration?: GeminiCommandIntegration;
  supportedGeminiFeatures: GeminiFeature[];
  
  // Lifecycle hooks for Gemini integration
  onGeminiEnabled?(integration: GeminiIntegrationResult): Promise<void>;
  onGeminiDisabled?(): Promise<void>;
  onContextLoaded?(context: CommandContext): Promise<void>;
}

export interface GeminiCommandIntegration {
  enhancedCoordination: boolean;
  contextAwareness: boolean;
  mcpToolsEnabled: boolean;
  customPrompts?: Record<string, string>;
  coordinationPatterns?: CoordinationPattern[];
}

export abstract class EnhancedBaseCommand extends Command implements GeminiAwareCommand {
  protected geminiService: GeminiIntegrationService;
  protected logger: Logger;
  public supportedGeminiFeatures: GeminiFeature[] = [];
  
  constructor(name: string, geminiService: GeminiIntegrationService) {
    super(name);
    this.geminiService = geminiService;
    this.logger = new Logger(`${name}Command`);
    this.setupGeminiIntegration();
  }
  
  private setupGeminiIntegration(): void {
    // Add global --gemini option to all commands
    this.option('--gemini', 'Enable Gemini integration with context loading');
    
    // Override action to handle Gemini integration
    const originalAction = this.action.bind(this);
    this.action(async (...args) => {
      await this.handleGeminiIntegration();
      return originalAction(...args);
    });
  }
  
  private async handleGeminiIntegration(): Promise<void> {
    const hasGeminiFlag = process.env.GEMINI_FLOW_INTEGRATED === 'true';
    
    if (hasGeminiFlag) {
      await this.enableGeminiFeatures();
    }
  }
  
  protected async enableGeminiFeatures(): Promise<void> {
    if (this.onGeminiEnabled) {
      const integration = JSON.parse(process.env.GEMINI_FLOW_CAPABILITIES || '{}');
      await this.onGeminiEnabled(integration);
    }
    
    // Load command-specific context
    const context = await this.geminiService.loadContextForCommand(this.name());
    if (context && this.onContextLoaded) {
      await this.onContextLoaded(context);
    }
  }
  
  // Utility methods for commands
  protected isGeminiEnabled(): boolean {
    return process.env.GEMINI_FLOW_INTEGRATED === 'true';
  }
  
  protected getGeminiCapabilities(): GeminiCapabilities {
    return JSON.parse(process.env.GEMINI_FLOW_CAPABILITIES || '{}');
  }
  
  protected async executeWithGeminiCoordination<T>(
    operation: string,
    executor: () => Promise<T>
  ): Promise<T> {
    if (this.isGeminiEnabled()) {
      return this.geminiService.wrapCommandExecution(this.name(), [operation], executor);
    }
    return executor();
  }
}
```

### 4. Context Loading Architecture

```typescript
export interface CommandContext {
  command: string;
  baseContext: string;
  enhancedPrompts: Record<string, string>;
  coordinationHints: CoordinationHint[];
  mcpTools: MCPToolReference[];
  metadata: ContextMetadata;
}

export interface CoordinationHint {
  pattern: 'sequential' | 'parallel' | 'hierarchical' | 'adaptive';
  applicability: string[];
  configuration: Record<string, any>;
}

export class ContextLoader {
  private contextCache: Map<string, CommandContext>;
  private promptTemplates: Map<string, PromptTemplate>;
  
  async loadCommandContext(commandName: string, projectRoot?: string): Promise<CommandContext> {
    const cacheKey = `${commandName}:${projectRoot || process.cwd()}`;
    
    if (this.contextCache.has(cacheKey)) {
      return this.contextCache.get(cacheKey)!;
    }
    
    const context = await this.buildCommandContext(commandName, projectRoot);
    this.contextCache.set(cacheKey, context);
    
    return context;
  }
  
  private async buildCommandContext(commandName: string, projectRoot?: string): Promise<CommandContext> {
    const baseContext = await this.loadBaseContext(projectRoot);
    const commandSpecific = await this.loadCommandSpecificContext(commandName, projectRoot);
    
    return {
      command: commandName,
      baseContext: baseContext.content,
      enhancedPrompts: this.buildEnhancedPrompts(commandName, baseContext, commandSpecific),
      coordinationHints: this.extractCoordinationHints(commandSpecific),
      mcpTools: this.identifyRelevantMCPTools(commandName),
      metadata: {
        loaded: new Date(),
        source: baseContext.source,
        commandSpecific: !!commandSpecific
      }
    };
  }
  
  private buildEnhancedPrompts(
    commandName: string,
    baseContext: GeminiContext,
    commandContext?: CommandSpecificContext
  ): Record<string, string> {
    const prompts: Record<string, string> = {};
    
    // Base coordination prompt
    prompts.coordination = `
${baseContext.content}

Command: ${commandName}
Enhanced AI Coordination Mode: ACTIVE

Please coordinate your response with available tools and context to provide
the most helpful and accurate assistance for this ${commandName} operation.
    `.trim();
    
    // Command-specific prompts
    if (commandContext?.prompts) {
      Object.assign(prompts, commandContext.prompts);
    }
    
    return prompts;
  }
}
```

### 5. MCP Tools Integration Bridge

```typescript
export interface MCPGeminiBridge {
  availableTools: MCPTool[];
  toolRegistry: Map<string, MCPToolHandler>;
  
  registerTool(tool: MCPTool): void;
  executeToolWithGeminiContext(toolName: string, args: any[], context: string): Promise<any>;
  translateGeminiToMCP(geminiRequest: any): MCPRequest;
  translateMCPToGemini(mcpResponse: any): GeminiResponse;
}

export class MCPGeminiBridgeImpl implements MCPGeminiBridge {
  public availableTools: MCPTool[] = [];
  public toolRegistry: Map<string, MCPToolHandler> = new Map();
  
  private geminiService: GeminiIntegrationService;
  private logger: Logger;
  
  constructor(geminiService: GeminiIntegrationService) {
    this.geminiService = geminiService;
    this.logger = new Logger('MCPGeminiBridge');
  }
  
  async initializeBridge(): Promise<void> {
    // Discover and register available MCP tools
    const mcpTools = await this.discoverMCPTools();
    
    for (const tool of mcpTools) {
      this.registerTool(tool);
    }
    
    this.logger.info(`Registered ${mcpTools.length} MCP tools for Gemini integration`);
  }
  
  registerTool(tool: MCPTool): void {
    this.availableTools.push(tool);
    this.toolRegistry.set(tool.name, tool.handler);
    
    this.logger.debug(`Registered MCP tool: ${tool.name}`);
  }
  
  async executeToolWithGeminiContext(
    toolName: string,
    args: any[],
    context: string
  ): Promise<any> {
    const handler = this.toolRegistry.get(toolName);
    if (!handler) {
      throw new Error(`MCP tool not found: ${toolName}`);
    }
    
    // Enhance args with Gemini context
    const enhancedArgs = this.enhanceArgsWithContext(args, context);
    
    // Execute with enhanced context
    const result = await handler.execute(enhancedArgs);
    
    // Post-process result for Gemini consumption
    return this.postProcessForGemini(result);
  }
  
  private enhanceArgsWithContext(args: any[], context: string): any[] {
    // Add context as metadata to tool execution
    return args.map(arg => {
      if (typeof arg === 'object' && arg !== null) {
        return {
          ...arg,
          _geminiContext: context,
          _enhancedMode: true
        };
      }
      return arg;
    });
  }
  
  private async discoverMCPTools(): Promise<MCPTool[]> {
    // Discovery logic for available MCP tools
    const tools: MCPTool[] = [];
    
    // Check for gemini-flow tools
    if (process.env.CLAUDE_FLOW_AVAILABLE) {
      tools.push(...await this.discoverClaudeFlowTools());
    }
    
    // Check for ruv-swarm tools
    if (process.env.RUV_SWARM_AVAILABLE) {
      tools.push(...await this.discoverRuvSwarmTools());
    }
    
    return tools;
  }
}
```

---

## 🔄 Integration Flow Diagram

```mermaid
sequenceDiagram
    participant CLI as CLI Entry Point
    participant GFH as GlobalFlagHandler
    participant GIS as GeminiIntegrationService
    participant CMD as Command
    participant MCP as MCP Bridge
    participant EXT as External Tools
    
    CLI->>GFH: Parse args with --gemini
    GFH->>GIS: initializeGlobal()
    
    par Detection
        GIS->>GIS: detectGeminiCLI()
    and Context Loading
        GIS->>GIS: loadGeminiContext()
    and Environment Setup
        GIS->>GIS: setupEnvironment()
    end
    
    GIS->>GFH: Integration result
    GFH->>CLI: Configure global env
    
    CLI->>CMD: Execute command
    CMD->>GIS: loadContextForCommand()
    GIS->>CMD: Command context
    
    opt MCP Tools Available
        CMD->>MCP: executeToolWithGeminiContext()
        MCP->>EXT: Enhanced execution
        EXT->>MCP: Results
        MCP->>CMD: Enhanced results
    end
    
    CMD->>CLI: Command result
```

---

## 📁 File Structure and Implementation

### Directory Structure
```
src/
├── cli/
│   ├── index.ts                 # Enhanced with GlobalFlagHandler
│   ├── global-flag-handler.ts   # NEW: Global flag processing
│   └── commands/
│       ├── base-command.ts      # NEW: Enhanced base class
│       ├── gemini.ts           # ENHANCED: Extended functionality
│       └── [other-commands].ts # ENHANCED: Implement GeminiAwareCommand
├── services/
│   ├── gemini-integration.ts   # ENHANCED: Extended service
│   └── context-loader.ts       # NEW: Context loading service
├── bridges/
│   ├── mcp-gemini-bridge.ts   # NEW: MCP integration bridge
│   └── tool-registry.ts       # NEW: Tool registration system
└── types/
    ├── gemini-integration.ts   # NEW: Integration types
    └── command-interfaces.ts   # NEW: Command interface definitions
```

### Implementation Phases

#### Phase 1: Core Infrastructure (Week 1)
1. **GlobalFlagHandler** implementation
2. **Enhanced GeminiIntegrationService** 
3. **BaseCommand** enhancement
4. **Context loading** architecture

#### Phase 2: Command Integration (Week 2)
1. Update all existing commands to extend **EnhancedBaseCommand**
2. Implement command-specific **Gemini features**
3. Add **context loading** for each command
4. Test **flag propagation** across all commands

#### Phase 3: MCP Bridge (Week 3)
1. **MCPGeminiBridge** implementation
2. **Tool discovery** and registration
3. **Context enhancement** for tool execution
4. **Integration testing** with available MCP tools

#### Phase 4: Advanced Features (Week 4)
1. **Performance optimization**
2. **Caching strategies**
3. **Error handling** and fallback mechanisms
4. **Documentation** and **examples**

---

## 🧪 Testing Strategy

### Unit Tests
```typescript
describe('GeminiIntegrationService', () => {
  it('should detect Gemini CLI correctly');
  it('should load context with fallback');
  it('should configure environment variables');
  it('should handle initialization errors gracefully');
});

describe('GlobalFlagHandler', () => {
  it('should process --gemini flag correctly');
  it('should handle missing Gemini CLI gracefully');
  it('should configure global environment');
});

describe('EnhancedBaseCommand', () => {
  it('should inherit Gemini capabilities');
  it('should load command-specific context');
  it('should execute with enhanced coordination');
});
```

### Integration Tests
```typescript
describe('Gemini Flag Integration', () => {
  it('should work across all commands');
  it('should load appropriate context per command');
  it('should integrate with available MCP tools');
  it('should maintain performance targets');
});
```

### End-to-End Tests
```typescript
describe('Complete Integration Flow', () => {
  it('should initialize Gemini integration on --gemini flag');
  it('should enhance command execution with context');
  it('should coordinate with MCP tools when available');
  it('should provide fallback behavior when CLI unavailable');
});
```

---

## 📊 Performance Targets

### Integration Performance
- **Flag detection**: <50ms
- **Context loading**: <200ms (cached), <500ms (fresh)
- **Environment setup**: <100ms
- **Command enhancement**: <10ms overhead per command

### Memory Efficiency
- **Context cache**: <50MB for typical project
- **Integration overhead**: <10MB base memory
- **Tool registry**: <5MB for full MCP toolset

### Reliability Targets
- **Graceful degradation**: 100% when Gemini CLI unavailable
- **Error recovery**: Handle all integration failures
- **Cache hit rate**: >90% for context loading
- **Integration success**: >95% when CLI available

---

## 🛡️ Security Considerations

### Environment Variable Security
```typescript
const SENSITIVE_ENV_VARS = [
  'GEMINI_API_KEY',
  'GOOGLE_APPLICATION_CREDENTIALS',
  'GOOGLE_CLIENT_SECRET'
];

function sanitizeEnvironmentForLogging(env: Record<string, string>): Record<string, string> {
  const sanitized = { ...env };
  
  SENSITIVE_ENV_VARS.forEach(key => {
    if (sanitized[key]) {
      sanitized[key] = '***REDACTED***';
    }
  });
  
  return sanitized;
}
```

### Context Data Protection
- **No sensitive data** in context files
- **Sanitize paths** and personal information
- **Validate context** content before loading
- **Secure caching** with appropriate permissions

---

## 🚀 Implementation Recommendations

### Development Approach
1. **Incremental implementation** - Start with core infrastructure
2. **Backward compatibility** - Ensure existing functionality unaffected
3. **Comprehensive testing** - Test with and without Gemini CLI
4. **Performance monitoring** - Track integration overhead
5. **Documentation first** - Clear examples and usage patterns

### Code Quality Standards
- **TypeScript strict mode** for all new code
- **Comprehensive error handling** with specific error types
- **Logging at appropriate levels** (debug, info, warn, error)
- **Unit test coverage** >90% for new components
- **Integration test coverage** for all command combinations

### Deployment Strategy
- **Feature flags** for gradual rollout
- **Monitoring dashboards** for integration success rates
- **Rollback procedures** for integration failures
- **User communication** about new capabilities

---

This architecture provides a robust, scalable foundation for the --gemini flag integration while maintaining compatibility with existing gemini-flow patterns and ensuring graceful degradation when Gemini CLI is unavailable.