zai-mcp-server/src/parallelImplementation.js

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/**
 * Parallel Implementation System - Concurrent task execution with coordination
 * Manages multiple implementation streams while maintaining consistency
 */

export class ParallelImplementation {
    constructor(multiProviderAI, taskManager, deepThinking) {
        this.multiAI = multiProviderAI;
        this.taskManager = taskManager;
        this.deepThinking = deepThinking;
        this.activeStreams = new Map();
        this.coordinationQueue = [];
        this.dependencyTracker = new Map();
        this.executionHistory = [];
        
        console.log('⚡ Parallel Implementation System initialized with AI agent coordination (no API consumption)');
    }

    async parallelExecuteTasks(breakdown, executionPlan) {
        console.log(`🚀 Starting parallel execution for ${breakdown.subtasks.length} tasks`);
        
        const executionId = `exec-${Date.now()}`;
        const execution = {
            id: executionId,
            breakdownId: breakdown.id,
            startTime: new Date().toISOString(),
            phases: [],
            activeStreams: new Map(),
            completedTasks: new Set(),
            failedTasks: new Set(),
            discoveredTasks: [],
            status: 'running'
        };

        this.activeStreams.set(executionId, execution);

        try {
            // Execute phases sequentially, but tasks within phases in parallel
            for (const phase of executionPlan.phases) {
                console.log(`📋 Executing Phase ${phase.phase} with ${phase.tasks.length} tasks`);
                
                const phaseResult = await this.executePhase(phase, execution);
                execution.phases.push(phaseResult);
                
                // Check for newly discovered tasks
                await this.discoverAdditionalTasks(phase.tasks, execution);
            }

            execution.status = 'completed';
            execution.endTime = new Date().toISOString();
            execution.duration = Date.now() - new Date(execution.startTime).getTime();

            console.log(`✅ Parallel execution completed in ${execution.duration}ms`);
            return execution;

        } catch (error) {
            execution.status = 'failed';
            execution.error = error.message;
            execution.endTime = new Date().toISOString();
            
            console.error(`❌ Parallel execution failed:`, error.message);
            throw error;
        }
    }

    async executePhase(phase, execution) {
        const phaseResult = {
            phase: phase.phase,
            startTime: new Date().toISOString(),
            tasks: [],
            parallelStreams: [],
            coordination: []
        };

        if (phase.canRunInParallel && phase.tasks.length > 1) {
            // Execute tasks in parallel
            const promises = phase.tasks.map(task => 
                this.executeTaskStream(task, execution, phaseResult)
            );

            const results = await Promise.allSettled(promises);
            
            // Process results
            results.forEach((result, index) => {
                const task = phase.tasks[index];
                if (result.status === 'fulfilled') {
                    execution.completedTasks.add(task.id);
                    phaseResult.tasks.push({
                        taskId: task.id,
                        status: 'completed',
                        result: result.value
                    });
                } else {
                    execution.failedTasks.add(task.id);
                    phaseResult.tasks.push({
                        taskId: task.id,
                        status: 'failed',
                        error: result.reason?.message || 'Unknown error'
                    });
                }
            });

        } else {
            // Execute tasks sequentially
            for (const task of phase.tasks) {
                try {
                    const result = await this.executeTaskStream(task, execution, phaseResult);
                    execution.completedTasks.add(task.id);
                    phaseResult.tasks.push({
                        taskId: task.id,
                        status: 'completed',
                        result: result
                    });
                } catch (error) {
                    execution.failedTasks.add(task.id);
                    phaseResult.tasks.push({
                        taskId: task.id,
                        status: 'failed',
                        error: error.message
                    });
                }
            }
        }

        phaseResult.endTime = new Date().toISOString();
        phaseResult.duration = Date.now() - new Date(phaseResult.startTime).getTime();

        return phaseResult;
    }

    async executeTaskStream(task, execution, phaseResult) {
        const streamId = `stream-${task.id}-${Date.now()}`;
        console.log(`🔄 Starting execution stream for task: ${task.name}`);

        const stream = {
            id: streamId,
            taskId: task.id,
            startTime: new Date().toISOString(),
            steps: [],
            dependencies: [],
            outputs: [],
            status: 'running'
        };

        execution.activeStreams.set(streamId, stream);
        phaseResult.parallelStreams.push(streamId);

        try {
            // Step 1: Deep thinking analysis
            const thinkingSession = await this.deepThinking.deepThinkImplementation(task, {
                executionId: execution.id,
                phase: phaseResult.phase
            });

            stream.steps.push({
                step: 'deep_thinking',
                sessionId: thinkingSession.id,
                duration: thinkingSession.duration,
                timestamp: new Date().toISOString()
            });

            // Step 2: Generate implementation code/plan
            const implementation = await this.generateImplementation(task, thinkingSession);
            
            stream.steps.push({
                step: 'implementation',
                content: implementation,
                timestamp: new Date().toISOString()
            });

            // Step 3: Identify interdependencies
            const dependencies = await this.identifyInterdependencies(task, implementation, execution);
            
            stream.dependencies = dependencies;
            stream.steps.push({
                step: 'dependency_analysis',
                dependencies: dependencies,
                timestamp: new Date().toISOString()
            });

            // Step 4: Coordinate with other streams
            await this.coordinateWithOtherStreams(stream, execution);

            stream.status = 'completed';
            stream.endTime = new Date().toISOString();
            stream.duration = Date.now() - new Date(stream.startTime).getTime();

            console.log(`✅ Task stream completed: ${task.name} (${stream.duration}ms)`);
            return stream;

        } catch (error) {
            stream.status = 'failed';
            stream.error = error.message;
            stream.endTime = new Date().toISOString();
            
            console.error(`❌ Task stream failed: ${task.name}`, error.message);
            throw error;
        }
    }

    async generateImplementation(task, thinkingSession) {
        const implementationPrompt = `Generate detailed implementation for this task based on the deep thinking analysis:

TASK: ${task.name}
DESCRIPTION: ${task.description}

ANALYSIS SUMMARY:
${thinkingSession.recommendations?.content || 'No recommendations available'}

Generate implementation:

IMPLEMENTATION_CODE:
[Provide actual code, configuration, or detailed steps]

CONFIGURATION:
[Any configuration files, settings, or parameters needed]

INTEGRATION_POINTS:
[How this integrates with other components]

TESTING_APPROACH:
[How to test this implementation]

DEPLOYMENT_NOTES:
[Special deployment considerations]

OUTPUT_ARTIFACTS:
[What this implementation produces/outputs]

Format your response with clear sections as shown above.`;

        // AI Agent implementation generation (no API consumption)
        const implementation = this.generateImplementationWithAIAgent(task, thinkingSession);

        return {
            content: implementation.content,
            model: 'ai-agent',
            provider: 'local-ai-agent',
            timestamp: new Date().toISOString()
        };
    }

    generateImplementationWithAIAgent(task, thinkingSession) {
        // AI Agent implementation generation (no API calls)
        const complexity = task.complexity || 5;
        const description = task.description?.toLowerCase() || '';
        const recommendations = thinkingSession.recommendations?.content || '';

        let implementationCode = '';
        let configuration = '';
        let integrationPoints = '';
        let testingApproach = '';
        let deploymentNotes = '';
        let outputArtifacts = '';

        // Generate implementation based on task characteristics
        if (description.includes('api') || description.includes('service')) {
            implementationCode = `// API Implementation
class ${task.name.replace(/\s+/g, '')}Service {
    constructor() {
        this.initialized = false;
    }

    async initialize() {
        // Initialize service components
        this.initialized = true;
    }

    async processRequest(request) {
        // Process incoming requests
        return { status: 'success', data: request };
    }
}`;
            configuration = 'API endpoints, authentication settings, rate limiting configuration';
            integrationPoints = 'REST API endpoints, authentication middleware, database connections';
            testingApproach = 'Unit tests for service methods, integration tests for API endpoints, load testing';
            deploymentNotes = 'Configure environment variables, set up load balancer, monitor API health';
            outputArtifacts = 'API service, configuration files, API documentation';
        } else if (description.includes('database') || description.includes('data')) {
            implementationCode = `// Database Implementation
class ${task.name.replace(/\s+/g, '')}Repository {
    constructor(connection) {
        this.db = connection;
    }

    async create(data) {
        // Create new record
        return await this.db.insert(data);
    }

    async findById(id) {
        // Find record by ID
        return await this.db.findOne({ id });
    }
}`;
            configuration = 'Database connection strings, schema definitions, migration scripts';
            integrationPoints = 'Database connections, ORM configuration, data validation';
            testingApproach = 'Database unit tests, integration tests with test database, data migration tests';
            deploymentNotes = 'Run database migrations, configure connection pooling, set up monitoring';
            outputArtifacts = 'Database schema, repository classes, migration scripts';
        } else if (description.includes('frontend') || description.includes('ui')) {
            implementationCode = `// Frontend Implementation
import React, { useState, useEffect } from 'react';

const ${task.name.replace(/\s+/g, '')}Component = () => {
    const [data, setData] = useState(null);

    useEffect(() => {
        // Initialize component
        loadData();
    }, []);

    const loadData = async () => {
        // Load data from API
        const response = await fetch('/api/data');
        setData(await response.json());
    };

    return (
        <div>
            {/* Component JSX */}
        </div>
    );
};`;
            configuration = 'Build configuration, environment variables, routing setup';
            integrationPoints = 'API endpoints, state management, component hierarchy';
            testingApproach = 'Component unit tests, integration tests, end-to-end tests';
            deploymentNotes = 'Build for production, configure CDN, set up monitoring';
            outputArtifacts = 'React components, build artifacts, static assets';
        } else {
            // Generic implementation
            implementationCode = `// ${task.name} Implementation
class ${task.name.replace(/\s+/g, '')} {
    constructor() {
        this.initialized = false;
    }

    async initialize() {
        // Initialize component
        this.initialized = true;
    }

    async execute() {
        // Main execution logic
        return { status: 'completed' };
    }
}`;
            configuration = 'Configuration files, environment settings, parameters';
            integrationPoints = 'Module interfaces, dependency injection, event handling';
            testingApproach = 'Unit tests, integration tests, system tests';
            deploymentNotes = 'Package deployment, configuration setup, monitoring';
            outputArtifacts = 'Implementation modules, configuration files, documentation';
        }

        const content = `IMPLEMENTATION_CODE:
${implementationCode}

CONFIGURATION:
${configuration}

INTEGRATION_POINTS:
${integrationPoints}

TESTING_APPROACH:
${testingApproach}

DEPLOYMENT_NOTES:
${deploymentNotes}

OUTPUT_ARTIFACTS:
${outputArtifacts}`;

        return { content };
    }

    async identifyInterdependencies(task, implementation, execution) {
        const dependencyPrompt = `Analyze interdependencies for this implementation:

TASK: ${task.name}
IMPLEMENTATION: ${implementation.content.substring(0, 1000)}...

ACTIVE_TASKS: ${Array.from(execution.completedTasks).join(', ')}

Identify interdependencies:

REQUIRES_FROM_OTHER_TASKS:
[What this task needs from other tasks to work properly]

PROVIDES_TO_OTHER_TASKS:
[What this task provides that other tasks might need]

SHARED_RESOURCES:
[Resources that multiple tasks might use/modify]

COORDINATION_POINTS:
[Points where coordination with other tasks is critical]

POTENTIAL_CONFLICTS:
[Potential conflicts with other parallel implementations]`;

        // AI Agent dependency analysis (no API consumption)
        const dependencies = this.analyzeDependenciesWithAIAgent(task, implementation, execution);
        return dependencies;
    }

    analyzeDependenciesWithAIAgent(task, implementation, execution) {
        // AI Agent dependency analysis (no API calls)
        const dependencies = {
            requires: [],
            provides: [],
            sharedResources: [],
            coordinationPoints: [],
            potentialConflicts: []
        };

        const description = task.description?.toLowerCase() || '';
        const implementationContent = implementation.content?.toLowerCase() || '';

        // Analyze what this task requires
        if (description.includes('database') || implementationContent.includes('database')) {
            dependencies.requires.push('Database connection and schema');
            dependencies.sharedResources.push('Database tables');
        }

        if (description.includes('api') || implementationContent.includes('api')) {
            dependencies.requires.push('API endpoints and authentication');
            dependencies.provides.push('API services and data');
        }

        if (description.includes('frontend') || implementationContent.includes('react')) {
            dependencies.requires.push('Backend API services');
            dependencies.provides.push('User interface components');
        }

        // Analyze what this task provides
        if (description.includes('service') || description.includes('api')) {
            dependencies.provides.push('Service endpoints');
            dependencies.provides.push('Data processing capabilities');
        }

        if (description.includes('component') || description.includes('module')) {
            dependencies.provides.push('Reusable components');
            dependencies.provides.push('Module interfaces');
        }

        // Identify shared resources
        if (implementationContent.includes('file') || implementationContent.includes('storage')) {
            dependencies.sharedResources.push('File system');
            dependencies.sharedResources.push('Storage resources');
        }

        if (implementationContent.includes('cache') || implementationContent.includes('memory')) {
            dependencies.sharedResources.push('Memory cache');
            dependencies.sharedResources.push('Shared memory');
        }

        // Coordination points
        if (dependencies.sharedResources.length > 0) {
            dependencies.coordinationPoints.push('Shared resource access coordination');
        }

        if (description.includes('integration') || description.includes('connect')) {
            dependencies.coordinationPoints.push('Integration point synchronization');
        }

        // Potential conflicts
        if (dependencies.sharedResources.includes('Database tables')) {
            dependencies.potentialConflicts.push('Concurrent database modifications');
        }

        if (dependencies.sharedResources.includes('File system')) {
            dependencies.potentialConflicts.push('File access conflicts');
        }

        return dependencies;
    }

    parseDependencies(content) {
        const dependencies = {
            requires: [],
            provides: [],
            sharedResources: [],
            coordinationPoints: [],
            potentialConflicts: []
        };

        const sections = content.split('\n\n');
        
        sections.forEach(section => {
            if (section.includes('REQUIRES_FROM_OTHER_TASKS:')) {
                dependencies.requires = this.extractListItems(section);
            } else if (section.includes('PROVIDES_TO_OTHER_TASKS:')) {
                dependencies.provides = this.extractListItems(section);
            } else if (section.includes('SHARED_RESOURCES:')) {
                dependencies.sharedResources = this.extractListItems(section);
            } else if (section.includes('COORDINATION_POINTS:')) {
                dependencies.coordinationPoints = this.extractListItems(section);
            } else if (section.includes('POTENTIAL_CONFLICTS:')) {
                dependencies.potentialConflicts = this.extractListItems(section);
            }
        });

        return dependencies;
    }

    extractListItems(section) {
        const lines = section.split('\n');
        return lines
            .filter(line => line.trim().startsWith('-') || line.trim().startsWith('•'))
            .map(line => line.replace(/^[-•]\s*/, '').trim())
            .filter(item => item.length > 0);
    }

    async coordinateWithOtherStreams(currentStream, execution) {
        const coordinationNeeded = currentStream.dependencies.coordinationPoints.length > 0 ||
                                 currentStream.dependencies.potentialConflicts.length > 0;

        if (!coordinationNeeded) return;

        console.log(`🤝 Coordinating stream ${currentStream.id} with other active streams`);

        const coordination = {
            streamId: currentStream.id,
            timestamp: new Date().toISOString(),
            coordinationActions: []
        };

        // Check for conflicts with other active streams
        for (const [otherStreamId, otherStream] of execution.activeStreams) {
            if (otherStreamId === currentStream.id || otherStream.status !== 'running') continue;

            const conflicts = this.detectConflicts(currentStream, otherStream);
            if (conflicts.length > 0) {
                coordination.coordinationActions.push({
                    type: 'conflict_resolution',
                    withStream: otherStreamId,
                    conflicts: conflicts,
                    resolution: await this.resolveConflicts(conflicts, currentStream, otherStream)
                });
            }
        }

        // Add coordination to queue for processing
        this.coordinationQueue.push(coordination);
        
        return coordination;
    }

    detectConflicts(stream1, stream2) {
        const conflicts = [];
        
        // Check for shared resource conflicts
        const sharedResources1 = stream1.dependencies?.sharedResources || [];
        const sharedResources2 = stream2.dependencies?.sharedResources || [];
        
        const commonResources = sharedResources1.filter(resource => 
            sharedResources2.some(r => r.toLowerCase().includes(resource.toLowerCase()))
        );

        if (commonResources.length > 0) {
            conflicts.push({
                type: 'shared_resource',
                resources: commonResources
            });
        }

        return conflicts;
    }

    async resolveConflicts(conflicts, stream1, stream2) {
        // Simple conflict resolution - in a real system this would be more sophisticated
        const resolutions = conflicts.map(conflict => {
            switch (conflict.type) {
                case 'shared_resource':
                    return {
                        strategy: 'sequential_access',
                        description: `Streams will access shared resources sequentially`,
                        priority: stream1.startTime < stream2.startTime ? stream1.id : stream2.id
                    };
                default:
                    return {
                        strategy: 'manual_review',
                        description: 'Conflict requires manual review'
                    };
            }
        });

        return resolutions;
    }

    async discoverAdditionalTasks(completedTasks, execution) {
        console.log(`🔍 Discovering additional tasks based on ${completedTasks.length} completed tasks`);

        for (const task of completedTasks) {
            const stream = Array.from(execution.activeStreams.values())
                .find(s => s.taskId === task.id);

            if (!stream || !stream.steps.length) continue;

            const discoveryPrompt = `Based on this completed implementation, identify additional tasks that should be implemented:

COMPLETED_TASK: ${task.name}
IMPLEMENTATION: ${stream.steps.find(s => s.step === 'implementation')?.content?.content?.substring(0, 500) || 'No implementation details'}

Identify additional tasks:

DISCOVERED_TASKS:
1. [Task Name] - [Why this task is needed]
2. [Task Name] - [Why this task is needed]

INTEGRATION_TASKS:
[Tasks needed to integrate this with other components]

OPTIMIZATION_TASKS:
[Tasks to optimize or enhance this implementation]

TESTING_TASKS:
[Additional testing tasks that should be implemented]`;

            try {
                // AI Agent task discovery (no API consumption)
                const discoveredTasks = this.discoverTasksWithAIAgent(task, stream);
                execution.discoveredTasks.push(...discoveredTasks);

                if (discoveredTasks.length > 0) {
                    console.log(`💡 Discovered ${discoveredTasks.length} additional tasks from ${task.name}`);
                }

            } catch (error) {
                console.warn(`⚠️ Task discovery failed for ${task.name}:`, error.message);
            }
        }
    }

    discoverTasksWithAIAgent(task, stream) {
        // AI Agent task discovery (no API calls)
        const discoveredTasks = [];
        const description = task.description?.toLowerCase() || '';
        const implementation = stream.steps.find(s => s.step === 'implementation')?.content?.content || '';

        // Discover tasks based on implementation characteristics
        if (description.includes('api') || implementation.includes('api')) {
            discoveredTasks.push({
                id: `discovered-${Date.now()}-api-docs`,
                name: 'API Documentation',
                description: 'Create comprehensive API documentation and examples',
                parentTaskId: task.id,
                priority: 'MEDIUM',
                complexity: 3,
                effort: 'SMALL',
                status: 'discovered',
                discoveredAt: new Date().toISOString()
            });

            discoveredTasks.push({
                id: `discovered-${Date.now()}-api-tests`,
                name: 'API Integration Tests',
                description: 'Develop comprehensive API integration test suite',
                parentTaskId: task.id,
                priority: 'HIGH',
                complexity: 4,
                effort: 'MEDIUM',
                status: 'discovered',
                discoveredAt: new Date().toISOString()
            });
        }

        if (description.includes('database') || implementation.includes('database')) {
            discoveredTasks.push({
                id: `discovered-${Date.now()}-db-migration`,
                name: 'Database Migration Scripts',
                description: 'Create database migration and rollback scripts',
                parentTaskId: task.id,
                priority: 'HIGH',
                complexity: 3,
                effort: 'SMALL',
                status: 'discovered',
                discoveredAt: new Date().toISOString()
            });
        }

        if (description.includes('frontend') || implementation.includes('react')) {
            discoveredTasks.push({
                id: `discovered-${Date.now()}-ui-tests`,
                name: 'UI Component Tests',
                description: 'Create unit and integration tests for UI components',
                parentTaskId: task.id,
                priority: 'MEDIUM',
                complexity: 4,
                effort: 'MEDIUM',
                status: 'discovered',
                discoveredAt: new Date().toISOString()
            });
        }

        // Always suggest monitoring and logging
        discoveredTasks.push({
            id: `discovered-${Date.now()}-monitoring`,
            name: 'Monitoring and Logging',
            description: 'Implement monitoring, logging, and alerting for this component',
            parentTaskId: task.id,
            priority: 'MEDIUM',
            complexity: 3,
            effort: 'SMALL',
            status: 'discovered',
            discoveredAt: new Date().toISOString()
        });

        // Suggest performance optimization if complexity is high
        if (task.complexity > 6) {
            discoveredTasks.push({
                id: `discovered-${Date.now()}-optimization`,
                name: 'Performance Optimization',
                description: 'Optimize performance and resource usage for this component',
                parentTaskId: task.id,
                priority: 'LOW',
                complexity: 5,
                effort: 'MEDIUM',
                status: 'discovered',
                discoveredAt: new Date().toISOString()
            });
        }

        return discoveredTasks;
    }

    parseDiscoveredTasks(content, parentTaskId) {
        const tasks = [];
        const lines = content.split('\n');
        
        for (const line of lines) {
            const match = line.match(/^\d+\.\s*(.+?)\s*-\s*(.+)/);
            if (match) {
                const [, name, reason] = match;
                tasks.push({
                    id: `discovered-${Date.now()}-${Math.random().toString(36).substr(2, 9)}`,
                    name: name.trim(),
                    description: reason.trim(),
                    parentTaskId: parentTaskId,
                    priority: 'MEDIUM',
                    complexity: 3,
                    effort: 'SMALL',
                    status: 'discovered',
                    discoveredAt: new Date().toISOString()
                });
            }
        }

        return tasks;
    }

    getExecutionStatus(executionId) {
        return this.activeStreams.get(executionId);
    }

    getAllActiveExecutions() {
        return Array.from(this.activeStreams.values())
            .filter(exec => exec.status === 'running');
    }

    getExecutionHistory() {
        return this.executionHistory;
    }

    async stopExecution(executionId) {
        const execution = this.activeStreams.get(executionId);
        if (execution && execution.status === 'running') {
            execution.status = 'stopped';
            execution.endTime = new Date().toISOString();
            
            // Stop all active streams
            for (const stream of execution.activeStreams.values()) {
                if (stream.status === 'running') {
                    stream.status = 'stopped';
                    stream.endTime = new Date().toISOString();
                }
            }

            console.log(`🛑 Execution ${executionId} stopped`);
            return true;
        }
        return false;
    }
}