/**
 * MCP Client utility for web dashboard
 * Provides interface to call MCP tools from the web dashboard
 */

import { Client } from '@modelcontextprotocol/sdk/client/index.js';
import { StdioClientTransport } from '@modelcontextprotocol/sdk/client/stdio.js';

let mcpClient: any = null;

export function getMCPClient() {
  // In a real implementation, this would connect to the MCP server
  // For now, we'll return a mock client that can simulate tool calls
  if (!mcpClient) {
    mcpClient = createMockMCPClient();
  }
  return mcpClient;
}

function createMockMCPClient() {
  return {
    async callTool(toolName: string, args: any) {
      console.log(`Mock MCP call: ${toolName}`, args);
      
      // Return mock data based on tool name
      switch (toolName) {
        case 'get_epic_progress':
          return {
            epicId: args.epicId,
            epicTitle: 'Mock Epic',
            progress: {
              completionPercentage: 65,
              completedStories: 8,
              totalStories: 12,
              inProgressStories: 3,
              blockedStories: 1
            },
            storyPoints: {
              total: 34,
              completed: 22,
              completionPercentage: 65
            },
            statusBreakdown: {
              todo: 1,
              inProgress: 3,
              review: 0,
              done: 8
            }
          };
          
        case 'get_team_velocity_trend':
          return {
            velocityTrend: [
              { sprintId: 'sprint-1', sprintName: 'Sprint 1', completedPoints: 21, plannedPoints: 25 },
              { sprintId: 'sprint-2', sprintName: 'Sprint 2', completedPoints: 23, plannedPoints: 25 },
              { sprintId: 'sprint-3', sprintName: 'Sprint 3', completedPoints: 26, plannedPoints: 30 },
              { sprintId: 'sprint-4', sprintName: 'Sprint 4', completedPoints: 24, plannedPoints: 25 },
              { sprintId: 'sprint-5', sprintName: 'Sprint 5', completedPoints: 28, plannedPoints: 30 }
            ],
            summary: {
              averageVelocity: 24.4,
              trendDirection: 'increasing',
              consistency: {
                standardDeviation: 2.5,
                coefficientOfVariation: 0.10
              }
            }
          };
          
        case 'get_cycle_time_metrics':
          return {
            stories: [
              { storyId: 'story-1', title: 'User Login', cycleTimeDays: 3.5, timeInEachStatus: { todo: 0.5, inProgress: 2, review: 0.5, done: 0.5 } },
              { storyId: 'story-2', title: 'Dashboard', cycleTimeDays: 5, timeInEachStatus: { todo: 1, inProgress: 3, review: 0.5, done: 0.5 } }
            ],
            summary: {
              totalStories: 2,
              completedStories: 2,
              averageCycleTimeDays: 4.25,
              medianCycleTimeDays: 4.25,
              bottlenecks: {
                longestPhase: 'inProgress',
                averageTimeInPhase: { todo: 0.75, inProgress: 2.5, review: 0.5, done: 0.5 }
              }
            }
          };
          
        case 'get_cross_sprint_analytics':
          return {
            sprints: [
              { name: 'Sprint 1', completionRate: 85, storiesCompleted: 17, storiesTotal: 20, velocity: 85 },
              { name: 'Sprint 2', completionRate: 92, storiesCompleted: 23, storiesTotal: 25, velocity: 92 },
              { name: 'Sprint 3', completionRate: 78, storiesCompleted: 18, storiesTotal: 23, velocity: 78 },
              { name: 'Sprint 4', completionRate: 95, storiesCompleted: 19, storiesTotal: 20, velocity: 95 },
              { name: 'Sprint 5', completionRate: 88, storiesCompleted: 22, storiesTotal: 25, velocity: 88 }
            ],
            trends: {
              averageCompletionRate: 87.6,
              velocityTrend: 'stable',
              predictability: 'high'
            }
          };
          
        case 'get_epic_timeline':
          return {
            epicId: args.epicId,
            timeline: [
              { sprintId: 'sprint-1', sprintName: 'Sprint 1', status: 'completed', storiesCompleted: 3, totalStories: 4, pointsCompleted: 13, totalPoints: 17, completionPercentage: 76 },
              { sprintId: 'sprint-2', sprintName: 'Sprint 2', status: 'active', storiesCompleted: 2, totalStories: 5, pointsCompleted: 8, totalPoints: 21, completionPercentage: 38 }
            ],
            summary: {
              totalSprints: 2,
              sprintsCompleted: 1,
              estimatedSprintsRemaining: 2
            }
          };
          
        case 'validate_epic_requirements':
          return {
            epicId: args.epicId,
            overallValid: false,
            validationResults: [
              { check: 'All stories completed', passed: false, message: '3 stories remaining incomplete' },
              { check: 'Acceptance criteria met', passed: true, message: 'All completed stories meet acceptance criteria' },
              { check: 'No blocked stories', passed: false, message: '1 story is currently blocked' },
              { check: 'Epic goals achieved', passed: true, message: 'All epic goals have been satisfied' }
            ],
            summary: {
              totalChecks: 4,
              passed: 2,
              failed: 2
            }
          };
          
        case 'generate_epic_burndown':
          return {
            epicId: args.epicId,
            chartData: [
              { date: new Date(Date.now() - 14 * 24 * 60 * 60 * 1000).toISOString(), remainingPoints: 55, idealPoints: 55 },
              { date: new Date(Date.now() - 10 * 24 * 60 * 60 * 1000).toISOString(), remainingPoints: 47, idealPoints: 44 },
              { date: new Date(Date.now() - 6 * 24 * 60 * 60 * 1000).toISOString(), remainingPoints: 38, idealPoints: 33 },
              { date: new Date(Date.now() - 2 * 24 * 60 * 60 * 1000).toISOString(), remainingPoints: 25, idealPoints: 22 },
              { date: new Date().toISOString(), remainingPoints: 20, idealPoints: 11 }
            ],
            summary: {
              totalPoints: 55,
              remainingPoints: 20,
              completedPoints: 35,
              burnRate: 2.5,
              projectedCompletion: 'On track'
            }
          };
          
        default:
          return { success: true, message: `Mock response for ${toolName}` };
      }
    }
  };
}

// Initialize MCP client connection
export async function initializeMCPClient() {
  try {
    // In production, this would establish a real connection to the MCP server
    console.log('Initializing MCP client connection...');
    mcpClient = createMockMCPClient();
    return true;
  } catch (error) {
    console.error('Failed to initialize MCP client:', error);
    return false;
  }
}