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

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export const dynamic = "force-dynamic";

/**
 * Dev Burndown Metrics API
 * GET /api/dev/metrics/burndown - Get burndown chart data for a sprint
 */

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

interface BurndownDataPoint {
  date: string;
  idealRemaining: number;
  actualRemaining: number;
  completed: number;
}

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

  const { searchParams } = new URL(request.url);
  const sprintId = searchParams.get('sprintId');

  if (!sprintId) {
    throw ApiError.badRequest('Sprint ID is required');
  }

  // Get sprint details
  const sprint = await prisma.devSprint.findUnique({
    where: { id: sprintId },
    include: {
      project: {
        select: { id: true, name: true, key: true, color: true }
      },
      tickets: {
        select: {
          id: true,
          ticketNumber: true,
          title: true,
          status: true,
          storyPoints: true,
          completedAt: true,
          createdAt: true
        }
      }
    }
  });

  if (!sprint) {
    throw ApiError.notFound('Sprint not found');
  }

  const startDate = new Date(sprint.startDate);
  const endDate = new Date(sprint.endDate);
  const now = new Date();

  // Calculate total story points at sprint start
  const totalPoints = sprint.tickets.reduce(
    (sum, t) => sum + (t.storyPoints || 0),
    0
  );

  // Generate date range
  const dates: Date[] = [];
  const currentDate = new Date(startDate);
  while (currentDate <= endDate) {
    dates.push(new Date(currentDate));
    currentDate.setDate(currentDate.getDate() + 1);
  }

  const sprintDuration = dates.length;
  const pointsPerDay = totalPoints / (sprintDuration - 1 || 1);

  // Calculate burndown data
  const burndownData: BurndownDataPoint[] = dates.map((date, index) => {
    const dateStr = date.toISOString().split('T')[0];

    // Ideal remaining (linear burndown)
    const idealRemaining = Math.max(0, totalPoints - pointsPerDay * index);

    // Actual remaining (based on completed tickets up to this date)
    const completedByDate = sprint.tickets
      .filter((t) => {
        if (t.status !== 'COMPLETED' || !t.completedAt) return false;
        const completedDate = new Date(t.completedAt);
        return completedDate <= date;
      })
      .reduce((sum, t) => sum + (t.storyPoints || 0), 0);

    // Only show actual data for past and current dates
    const actualRemaining =
      date <= now ? totalPoints - completedByDate : totalPoints - completedByDate;

    return {
      date: dateStr,
      idealRemaining: Math.round(idealRemaining * 10) / 10,
      actualRemaining:
        date <= now ? Math.round(actualRemaining * 10) / 10 : (null as unknown as number),
      completed: date <= now ? Math.round(completedByDate * 10) / 10 : 0
    };
  });

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

  const remainingPoints = totalPoints - completedPoints;
  const completedTickets = sprint.tickets.filter((t) =>
    ['COMPLETED', 'CANCELLED', 'WONT_FIX'].includes(t.status)
  ).length;

  // Calculate if on track
  const daysPassed = Math.max(
    0,
    Math.floor((now.getTime() - startDate.getTime()) / (1000 * 60 * 60 * 24))
  );
  const expectedPointsDone = Math.min(totalPoints, pointsPerDay * daysPassed);
  const isOnTrack = completedPoints >= expectedPointsDone * 0.9; // Within 10%

  // Days remaining
  const daysRemaining = Math.max(
    0,
    Math.ceil((endDate.getTime() - now.getTime()) / (1000 * 60 * 60 * 24))
  );

  // Tickets in each status
  const ticketsByStatus = await prisma.devTicket.groupBy({
    by: ['status'],
    where: { sprintId },
    _count: true,
    _sum: { storyPoints: true }
  });

  const statusBreakdown = Object.fromEntries(
    ticketsByStatus.map((s) => [
      s.status,
      { count: s._count, points: s._sum.storyPoints || 0 },
    ])
  );

  return successResponse({
    sprint: {
      id: sprint.id,
      name: sprint.name,
      goal: sprint.goal,
      status: sprint.status,
      startDate: sprint.startDate,
      endDate: sprint.endDate,
      project: sprint.project
    },
    burndown: burndownData,
    summary: {
      totalPoints,
      completedPoints,
      remainingPoints,
      completionPercentage:
        totalPoints > 0 ? Math.round((completedPoints / totalPoints) * 100) : 0,
      totalTickets: sprint.tickets.length,
      completedTickets,
      daysRemaining,
      isOnTrack,
      expectedPointsDone: Math.round(expectedPointsDone)
    },
    statusBreakdown
  });
}

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