Health & Fitness Coach MCP

import { NextRequest, NextResponse } from 'next/server' import { planStore } from '@/lib/stores' export async function POST(request: NextRequest) { let userId: string | undefined; try { const { userId: requestUserId, planType = 'daily', userMessage = '', customPlan = null } = await request.json() userId = requestUserId; // Capture userId for use in catch block if (!userId) { return NextResponse.json( { error: 'userId is required' }, { status: 400 } ) } // If we have a custom plan from the chat interface, use it directly if (customPlan) { console.log('📋 Using custom plan from chat interface:', customPlan) const planText = generateContextualPlanText(planType, userMessage) const structuredPlan = { workouts: customPlan.map((exercise: any, index: number) => ({ id: (index + 1).toString(), name: exercise.name, type: exercise.type || 'strength', sets: parseInt(exercise.sets) || 3, reps: exercise.reps ? parseInt(exercise.reps) : (exercise.duration ? 1 : 10), weight: exercise.weight || undefined, duration: exercise.duration ? (exercise.duration.includes('s') ? parseInt(exercise.duration) : parseInt(exercise.duration) * 60) : exercise.estimatedDuration || undefined, completed: false, })), meals: [], recommendations: [ 'Focus on proper form over speed', 'Rest 30-60 seconds between sets', 'Stay hydrated throughout your workout', 'Listen to your body and modify as needed' ] } // Store the plan in memory for retrieval by context API planStore.set(userId, structuredPlan) console.log('💾 Stored plan for user:', userId, structuredPlan) return NextResponse.json({ success: true, planText, structuredPlan, }) } // Call the MCP plan generator tool const mcpResponse = await fetch(`${request.nextUrl.origin}/mcp`, { method: 'POST', headers: { 'Content-Type': 'application/json', 'Accept': 'application/json, text/event-stream', }, body: JSON.stringify({ jsonrpc: '2.0', id: Date.now(), method: 'tools/call', params: { name: 'generate-plan', arguments: { userId, planType, }, }, }), }) if (!mcpResponse.ok) { const errorText = await mcpResponse.text() throw new Error(`MCP call failed: ${mcpResponse.status} ${mcpResponse.statusText} - ${errorText}`) } const responseText = await mcpResponse.text() console.log('✅ MCP plan generation successful:', responseText) // Parse the Server-Sent Events format to extract the plan text let planText = generateContextualPlanText(planType, userMessage) const dataMatch = responseText.match(/data: (.+)/) if (dataMatch) { try { const data = JSON.parse(dataMatch[1]) if (data.error) { throw new Error(`MCP tool error: ${data.error.message}`) } planText = data.result?.content?.[0]?.text || planText } catch (parseError) { console.log('Could not parse MCP response, using default plan text') } } // Generate structured plan data const structuredPlan = generateStructuredPlan(planText, userId, planType) // Store the plan in memory for retrieval by context API planStore.set(userId, structuredPlan) console.log('💾 Stored MCP plan for user:', userId, structuredPlan) return NextResponse.json({ success: true, planText, structuredPlan, }) } catch (error) { console.error('Error generating plan:', error) // Return fallback plan based on plan type const fallbackPlan = generateFallbackPlan('workout', '') // Store the fallback plan as well if (userId) { planStore.set(userId, fallbackPlan.structuredPlan) console.log('💾 Stored fallback plan for user:', userId, fallbackPlan.structuredPlan) } return NextResponse.json(fallbackPlan) } } function generateContextualPlanText(planType: string, userMessage: string): string { if (planType === 'nutrition') { return `🍽️ Perfect! I've analyzed your current activity and created a personalized meal plan that will fuel your workouts and support your fitness goals. This plan focuses on balanced nutrition with optimal macros for energy and recovery.` } else if (planType === 'workout') { return `💪 Excellent! I've designed a workout plan tailored to your current fitness level and goals. This routine will help you build strength, improve cardiovascular health, and maintain consistency in your fitness journey.` } else { return `🎯 Fantastic! I've created a comprehensive fitness plan that includes both workouts and nutrition guidance. This holistic approach will help you achieve your goals more effectively by combining proper training with optimal nutrition.` } } function generateFallbackPlan(planType: string, userMessage: string) { if (planType === 'nutrition') { return { planText: generateContextualPlanText(planType, userMessage), structuredPlan: { workouts: [], meals: [ { id: '1', mealType: 'breakfast', name: 'Protein-packed oatmeal with berries and almonds', calories: 320, protein: 12, carbs: 45, fat: 8, time: '8:00 AM', }, { id: '2', mealType: 'lunch', name: 'Grilled chicken Caesar salad', calories: 450, protein: 35, carbs: 15, fat: 22, time: '12:30 PM', }, { id: '3', mealType: 'snack', name: 'Greek yogurt with honey', calories: 150, protein: 15, carbs: 18, fat: 3, time: '3:00 PM', }, { id: '4', mealType: 'dinner', name: 'Baked salmon with quinoa & broccoli', calories: 520, protein: 40, carbs: 35, fat: 18, time: '7:00 PM', }, ], recommendations: [ 'Drink water before each meal to aid digestion', 'Include protein in every meal for muscle recovery', 'Eat colorful vegetables for essential micronutrients', ], }, } } else { return { planText: generateContextualPlanText(planType, userMessage), structuredPlan: { workouts: [ { id: '1', name: 'Push-ups', type: 'strength' as const, sets: 3, reps: 12, completed: false, }, { id: '2', name: 'Squats', type: 'strength' as const, sets: 3, reps: 15, weight: 'bodyweight', completed: false, }, { id: '3', name: 'Plank', type: 'strength' as const, sets: 3, reps: 1, duration: 30, completed: false, }, { id: '4', name: 'Light cardio walk', type: 'cardio' as const, sets: 1, reps: 1, duration: 20, completed: false, }, ], meals: [], recommendations: [ 'Warm up for 5 minutes before starting exercises', 'Focus on proper form rather than speed', 'Rest 30-60 seconds between sets', ], }, } } } function generateStructuredPlan(planText: string, userId: string, planType: string) { // Return plan based on type if (planType === 'nutrition') { return generateFallbackPlan(planType, '').structuredPlan } else { return generateFallbackPlan('workout', '').structuredPlan } }