All files / src/app/api/dev/metrics/velocity route.ts

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export const dynamic = "force-dynamic";

/**
 * Dev Velocity Metrics API
 * GET /api/dev/metrics/velocity - Get sprint velocity data
 */

import { NextRequest, NextResponse } from 'next/server';
import { } from 'next-auth';
import {
  withAdmin,
  withErrorHandling,
  successResponse,
  ApiSuccessResponse,
  ApiErrorResponse
} from '@/lib/api';
import { } from '@/lib/api/middleware';
import { prisma } from '@/lib/prisma';

interface SprintVelocity {
  sprintId: string;
  sprintName: string;
  startDate: Date;
  endDate: Date;
  status: string;
  committedPoints: number;
  completedPoints: number;
  committedTickets: number;
  completedTickets: number;
  velocityPercentage: number;
}

async function handleGet(
  request: NextRequest
): Promise<NextResponse<ApiSuccessResponse<unknown> | ApiErrorResponse>> {

  const { searchParams } = new URL(request.url);
  const projectId = searchParams.get('projectId');
  const limit = parseInt(searchParams.get('limit') || '10', 10);

  // Build where clause
  const where: Record<string, unknown> = {
    status: { in: ['COMPLETED', 'ACTIVE'] }
  };

  if (projectId) {
    where.projectId = projectId;
  }

  // Get completed and active sprints
  const sprints = await prisma.devSprint.findMany({
    where,
    orderBy: { endDate: 'desc' },
    take: limit,
    include: {
      project: {
        select: { id: true, name: true, key: true, color: true }
      },
      tickets: {
        select: {
          id: true,
          status: true,
          storyPoints: true
        }
      }
    }
  });

  // Calculate velocity for each sprint
  const velocityData: SprintVelocity[] = sprints.map((sprint) => {
    const tickets = sprint.tickets;

    const committedPoints = tickets.reduce((sum, t) => sum + (t.storyPoints || 0), 0);
    const completedPoints = tickets
      .filter((t) => t.status === 'COMPLETED')
      .reduce((sum, t) => sum + (t.storyPoints || 0), 0);

    const committedTickets = tickets.length;
    const completedTickets = tickets.filter((t) =>
      ['COMPLETED', 'CANCELLED', 'WONT_FIX'].includes(t.status)
    ).length;

    return {
      sprintId: sprint.id,
      sprintName: sprint.name,
      startDate: sprint.startDate,
      endDate: sprint.endDate,
      status: sprint.status,
      committedPoints,
      completedPoints,
      committedTickets,
      completedTickets,
      velocityPercentage:
        committedPoints > 0 ? Math.round((completedPoints / committedPoints) * 100) : 0
    };
  });

  // Calculate average velocity (from completed sprints only)
  const completedSprints = velocityData.filter((s) => s.status === 'COMPLETED');
  const averageVelocity =
    completedSprints.length > 0
      ? Math.round(
        completedSprints.reduce((sum, s) => sum + s.completedPoints, 0) /
        completedSprints.length
      )
      : 0;

  // Calculate trend (last 3 vs previous 3)
  let trend: 'up' | 'down' | 'stable' = 'stable';
  if (completedSprints.length >= 6) {
    const recent3 = completedSprints.slice(0, 3);
    const previous3 = completedSprints.slice(3, 6);

    const recentAvg =
      recent3.reduce((sum, s) => sum + s.completedPoints, 0) / recent3.length;
    const previousAvg =
      previous3.reduce((sum, s) => sum + s.completedPoints, 0) / previous3.length;

    const diff = recentAvg - previousAvg;
    const threshold = previousAvg * 0.1; // 10% threshold

    if (diff > threshold) {
      trend = 'up';
    } else if (diff < -threshold) {
      trend = 'down';
    }
  }

  // Get project breakdown if no specific project filter
  let projectVelocity: Array<{
    projectId: string;
    projectName: string;
    projectKey: string;
    averageVelocity: number;
    sprintCount: number;
  }> = [];

  if (!projectId) {
    const projects = await prisma.devProject.findMany({
      where: { isActive: true },
      select: {
        id: true,
        name: true,
        key: true,
        sprints: {
          where: { status: 'COMPLETED' },
          take: 5,
          orderBy: { endDate: 'desc' },
          include: {
            tickets: {
              where: { status: 'COMPLETED' },
              select: { storyPoints: true }
            }
          }
        }
      }
    });

    projectVelocity = projects
      .filter((p) => p.sprints.length > 0)
      .map((p) => {
        const totalPoints = p.sprints.reduce(
          (sum, s) =>
            sum + s.tickets.reduce((tSum, t) => tSum + (t.storyPoints || 0), 0),
          0
        );
        return {
          projectId: p.id,
          projectName: p.name,
          projectKey: p.key,
          averageVelocity: Math.round(totalPoints / p.sprints.length),
          sprintCount: p.sprints.length
        };
      })
      .sort((a, b) => b.averageVelocity - a.averageVelocity);
  }

  return successResponse({
    sprints: velocityData,
    summary: {
      averageVelocity,
      trend,
      completedSprintsCount: completedSprints.length,
      totalPointsDelivered: completedSprints.reduce(
        (sum, s) => sum + s.completedPoints,
        0
      )
    },
    byProject: projectVelocity
  });
}

export const GET = withErrorHandling(withAdmin(handleGet));