All files / src/app/api/admin/segments/preview route.ts

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export const dynamic = "force-dynamic";

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

const LOG_CATEGORY = "ADMIN_SEGMENT_PREVIEW_API";

interface SegmentRule {
  field: string;
  operator: string;
  value: string | number | string[] | number[];
}

interface SegmentRuleGroup {
  conditions: SegmentRule[];
  logic: "AND" | "OR";
}

/**
 * POST /api/admin/segments/preview
 * Preview segment member count based on rules
 */
async function handlePost(request: NextRequest): Promise<NextResponse<ApiSuccessResponse<unknown> | ApiErrorResponse>> {
  const body = await request.json();
  const rules: SegmentRuleGroup[] = body.rules || [];

  const whereClause = buildWhereClause(rules);
  const count = await prisma.user.count({ where: whereClause });

  // Get sample members
  const sampleMembers = await prisma.user.findMany({
    where: whereClause,
    take: 5,
    select: {
      id: true,
      email: true,
      name: true,
      createdAt: true },
    orderBy: { createdAt: "desc" } });

  logger.info("Segment preview", { category: LOG_CATEGORY, rulesCount: rules.length, matchCount: count });

  return successResponse({
    count,
    sampleMembers: sampleMembers.map((u) => ({
      id: u.id,
      email: u.email,
      name: u.name || "N/A",
      joinedAt: u.createdAt })) });
}

/**
 * Build Prisma where clause from segment rules
 */
function buildWhereClause(rules: SegmentRuleGroup[]): Record<string, unknown> {
  if (!rules || rules.length === 0) {
    return {};
  }

  const conditions: Record<string, unknown>[] = [];

  for (const ruleGroup of rules) {
    const groupConditions: Record<string, unknown>[] = [];

    for (const condition of ruleGroup.conditions) {
      const prismaCondition = buildCondition(condition);
      if (prismaCondition) {
        groupConditions.push(prismaCondition);
      }
    }

    if (groupConditions.length > 0) {
      if (ruleGroup.logic === "OR") {
        conditions.push({ OR: groupConditions });
      } else {
        conditions.push({ AND: groupConditions });
      }
    }
  }

  return conditions.length > 0 ? { AND: conditions } : {};
}

/**
 * Build a single Prisma condition from a rule
 */
function buildCondition(rule: SegmentRule): Record<string, unknown> | null {
  const { field, operator, value } = rule;

  // Map field names to Prisma paths
  const fieldMap: Record<string, string> = {
    total_spent: "orders",
    orders_count: "orders",
    lifetime_points: "customerLoyalty.lifetimePoints",
    current_tier: "customerLoyalty.currentTierId",
    created_at: "createdAt",
    email_domain: "email",
    has_reviewed: "reviews" };

  const prismaField = fieldMap[field] || field;

  // Special handling for aggregate fields
  if (field === "orders_count" || field === "total_spent") {
    // These require subqueries which are complex in Prisma
    // For now, we'll use a simplified approach
    return null;
  }

  if (field === "has_reviewed") {
    const hasReviewed = String(value) === "true";
    return hasReviewed
      ? { reviews: { some: {} } }
      : { reviews: { none: {} } };
  }

  if (field === "email_domain") {
    const domain = String(value);
    switch (operator) {
      case "equals":
        return { email: { endsWith: `@${domain}` } };
      case "not_equals":
        return { NOT: { email: { endsWith: `@${domain}` } } };
      case "contains":
        return { email: { contains: domain } };
      case "not_contains":
        return { NOT: { email: { contains: domain } } };
      default:
        return null;
    }
  }

  // Build condition based on operator
  switch (operator) {
    case "equals":
      return { [prismaField]: value };
    case "not_equals":
      return { [prismaField]: { not: value } };
    case "greater_than":
      return { [prismaField]: { gt: value } };
    case "less_than":
      return { [prismaField]: { lt: value } };
    case "greater_than_or_equal":
      return { [prismaField]: { gte: value } };
    case "less_than_or_equal":
      return { [prismaField]: { lte: value } };
    case "contains":
      return { [prismaField]: { contains: value as string } };
    case "not_contains":
      return { [prismaField]: { not: { contains: value as string } } };
    case "in":
      return { [prismaField]: { in: value as (string | number)[] } };
    case "not_in":
      return { [prismaField]: { notIn: value as (string | number)[] } };
    case "is_empty":
      return { [prismaField]: null };
    case "is_not_empty":
      return { [prismaField]: { not: null } };
    default:
      return null;
  }
}

export const POST = withErrorHandling(withAdmin(handlePost));