All files / src/app/api/dev/milestones/[id] route.ts

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export const dynamic = "force-dynamic";

/**
 * Dev Milestone Detail API
 * GET /api/dev/milestones/[id] - Get a single milestone with stats
 * PATCH /api/dev/milestones/[id] - Update a milestone
 * DELETE /api/dev/milestones/[id] - Delete a milestone
 */

import { NextRequest, NextResponse } from 'next/server';
import { Session } from "next-auth";
import {
  withAdmin,
  withErrorHandling,
  successResponse,
  ApiError,
  ApiSuccessResponse,
  ApiErrorResponse
} from "@/lib/api";
import { AuthenticatedUser } from "@/lib/api/middleware";
import { prisma } from '@/lib/prisma';
import { UpdateDevMilestoneSchema } from '@/lib/validation/dev-ticket-schemas';
import { getMilestoneProgress } from '@/lib/dev-ticket';
import { logger } from '@/lib/logging';

interface RouteParams {
  params: Promise<{ id: string }>;
}

async function handleGet(
  request: NextRequest,
  context: unknown
): Promise<NextResponse<ApiSuccessResponse<unknown> | ApiErrorResponse>> {
  const { id } = await (context as RouteParams).params;

  const milestone = await prisma.devMilestone.findUnique({
    where: { id },
    include: {
      project: {
        select: { id: true, name: true, key: true, color: true }
      },
      tickets: {
        include: {
          assignee: {
            select: { id: true, name: true, email: true, image: true }
          },
          labels: true
        },
        orderBy: [{ priority: 'desc' }, { createdAt: 'asc' }]
      },
      _count: {
        select: { tickets: true }
      }
    }
  });

  if (!milestone) {
    throw ApiError.notFound('Milestone not found');
  }

  // Get progress stats
  const progress = await getMilestoneProgress(id);

  // Get ticket breakdown by status
  const ticketsByStatus = await prisma.devTicket.groupBy({
    by: ['status'],
    where: { milestoneId: id },
    _count: true
  });

  return successResponse({
    ...milestone,
    stats: {
      ...progress,
      byStatus: Object.fromEntries(ticketsByStatus.map((s) => [s.status, s._count]))
    }
  });
}

async function handlePatch(
  request: NextRequest,
  context: unknown,
  session: Session,
  user: AuthenticatedUser
): Promise<NextResponse<ApiSuccessResponse<unknown> | ApiErrorResponse>> {
  const { id } = await (context as RouteParams).params;
  const body = await request.json();

  const validationResult = UpdateDevMilestoneSchema.safeParse(body);
  if (!validationResult.success) {
    throw ApiError.validation(
      'Validation failed',
      validationResult.error.flatten().fieldErrors
    );
  }

  // Check if milestone exists
  const existingMilestone = await prisma.devMilestone.findUnique({
    where: { id }
  });

  if (!existingMilestone) {
    throw ApiError.notFound('Milestone not found');
  }

  const data = validationResult.data;

  // Build update data
  const updateData: Record<string, unknown> = { ...data };

  // If completing milestone, set completedAt
  if (data.status === 'COMPLETED' && existingMilestone.status !== 'COMPLETED') {
    updateData.completedAt = new Date();
  }

  // If reopening, clear completedAt
  if (data.status && data.status !== 'COMPLETED' && existingMilestone.completedAt) {
    updateData.completedAt = null;
  }

  // Update milestone
  const milestone = await prisma.devMilestone.update({
    where: { id },
    data: updateData,
    include: {
      project: {
        select: { id: true, name: true, key: true, color: true }
      },
      _count: {
        select: { tickets: true }
      }
    }
  });

  logger.info(`Updated milestone "${milestone.name}"`, {
    category: 'DEV_MILESTONES',
    milestoneId: id,
    userId: user.id,
    changes: Object.keys(data)
  });

  return successResponse(milestone);
}

async function handleDelete(
  request: NextRequest,
  context: unknown,
  session: Session,
  user: AuthenticatedUser
): Promise<NextResponse<ApiSuccessResponse<unknown> | ApiErrorResponse>> {
  const { id } = await (context as RouteParams).params;

  // Check if milestone exists
  const milestone = await prisma.devMilestone.findUnique({
    where: { id },
    include: {
      _count: { select: { tickets: true } }
    }
  });

  if (!milestone) {
    throw ApiError.notFound('Milestone not found');
  }

  // Remove milestone reference from tickets (don't delete tickets)
  if (milestone._count.tickets > 0) {
    await prisma.devTicket.updateMany({
      where: { milestoneId: id },
      data: { milestoneId: null }
    });
  }

  // Delete milestone
  await prisma.devMilestone.delete({
    where: { id }
  });

  logger.info(`Deleted milestone "${milestone.name}"`, {
    category: 'DEV_MILESTONES',
    milestoneId: id,
    userId: user.id,
    ticketsUnlinked: milestone._count.tickets
  });

  return successResponse({
    message: 'Milestone deleted successfully',
    ticketsUnlinked: milestone._count.tickets
  });
}

export const GET = withErrorHandling(withAdmin(handleGet));
export const PATCH = withErrorHandling(withAdmin(handlePatch));
export const DELETE = withErrorHandling(withAdmin(handleDelete));