import type { AdminDiagnosticsDto, AuditEventDto } from "@mrp/shared";
import fs from "node:fs/promises";

import { env } from "../../config/env.js";
import { paths } from "../../config/paths.js";
import { prisma } from "../../lib/prisma.js";

function mapAuditEvent(record: {
  id: string;
  actorId: string | null;
  entityType: string;
  entityId: string | null;
  action: string;
  summary: string;
  metadataJson: string;
  createdAt: Date;
  actor: {
    firstName: string;
    lastName: string;
  } | null;
}): AuditEventDto {
  return {
    id: record.id,
    actorId: record.actorId,
    actorName: record.actor ? `${record.actor.firstName} ${record.actor.lastName}`.trim() : null,
    entityType: record.entityType,
    entityId: record.entityId,
    action: record.action,
    summary: record.summary,
    metadataJson: record.metadataJson,
    createdAt: record.createdAt.toISOString(),
  };
}

export async function getAdminDiagnostics(): Promise<AdminDiagnosticsDto> {
  const [
    companyProfile,
    userCount,
    activeUserCount,
    roleCount,
    permissionCount,
    customerCount,
    vendorCount,
    inventoryItemCount,
    warehouseCount,
    workOrderCount,
    projectCount,
    purchaseOrderCount,
    salesQuoteCount,
    salesOrderCount,
    shipmentCount,
    attachmentCount,
    auditEventCount,
    recentAuditEvents,
  ] = await Promise.all([
    prisma.companyProfile.findFirst({ where: { isActive: true }, select: { id: true } }),
    prisma.user.count(),
    prisma.user.count({ where: { isActive: true } }),
    prisma.role.count(),
    prisma.permission.count(),
    prisma.customer.count(),
    prisma.vendor.count(),
    prisma.inventoryItem.count(),
    prisma.warehouse.count(),
    prisma.workOrder.count(),
    prisma.project.count(),
    prisma.purchaseOrder.count(),
    prisma.salesQuote.count(),
    prisma.salesOrder.count(),
    prisma.shipment.count(),
    prisma.fileAttachment.count(),
    prisma.auditEvent.count(),
    prisma.auditEvent.findMany({
      include: {
        actor: {
          select: {
            firstName: true,
            lastName: true,
          },
        },
      },
      orderBy: [{ createdAt: "desc" }],
      take: 25,
    }),
  ]);

  await Promise.all([fs.access(paths.dataDir), fs.access(paths.uploadsDir)]);

  return {
    serverTime: new Date().toISOString(),
    nodeVersion: process.version,
    databaseUrl: env.DATABASE_URL,
    dataDir: paths.dataDir,
    uploadsDir: paths.uploadsDir,
    clientOrigin: env.CLIENT_ORIGIN,
    companyProfilePresent: Boolean(companyProfile),
    userCount,
    activeUserCount,
    roleCount,
    permissionCount,
    customerCount,
    vendorCount,
    inventoryItemCount,
    warehouseCount,
    workOrderCount,
    projectCount,
    purchaseOrderCount,
    salesDocumentCount: salesQuoteCount + salesOrderCount,
    shipmentCount,
    attachmentCount,
    auditEventCount,
    recentAuditEvents: recentAuditEvents.map(mapAuditEvent),
  };
}