import { NextRequest, NextResponse } from 'next/server';
import { z } from 'zod';
import { auditCreate } from '@/features/foundation/audit-log/service';
import {
  auditCrmSecurityEvent,
  buildCrmSecurityContext
} from '@/features/crm/security/server/service';
import { createCustomer, listCustomers } from '@/features/crm/customers/server/service';
import { customerSchema } from '@/features/crm/customers/schemas/customer.schema';
import { PERMISSIONS } from '@/lib/auth/rbac';
import { AuthError, requireOrganizationAccess } from '@/lib/auth/session';

const customerRequestSchema = customerSchema.extend({
  branchId: z.string().nullable().optional(),
  leadChannel: z.string().nullable().optional(),
  customerGroup: z.string().nullable().optional(),
  customerSubGroup: z.string().nullable().optional()
});

export async function GET(request: NextRequest) {
  try {
    const { organization, session, membership } = await requireOrganizationAccess({
      permission: PERMISSIONS.crmCustomerRead
    });
    const { searchParams } = request.nextUrl;
    const page = Number(searchParams.get('page') ?? 1);
    const limit = Number(searchParams.get('limit') ?? 10);
    const search = searchParams.get('search') ?? undefined;
    const customerStatus = searchParams.get('customerStatus') ?? undefined;
    const customerType = searchParams.get('customerType') ?? undefined;
    const branch = searchParams.get('branch') ?? undefined;
    const sort = searchParams.get('sort') ?? undefined;
    const accessContext = buildCrmSecurityContext({
      organizationId: organization.id,
      userId: session.user.id,
      membership
    });
    const result = await listCustomers(organization.id, {
      page,
      limit,
      search,
      customerStatus,
      customerType,
      branch,
      sort
    }, accessContext);
    const offset = (page - 1) * limit;

    return NextResponse.json({
      success: true,
      time: new Date().toISOString(),
      message: 'Customers loaded successfully',
      totalItems: result.totalItems,
      offset,
      limit,
      items: result.items
    });
  } catch (error) {
    if (error instanceof AuthError) {
      if (error.status === 403) {
        const access = await requireOrganizationAccess({
          permission: PERMISSIONS.crmCustomerRead
        }).catch(() => null);

        if (access) {
          await auditCrmSecurityEvent({
            organizationId: access.organization.id,
            userId: access.session.user.id,
            action: 'customer_scope_violation',
            entityType: 'crm_customer',
            entityId: 'list',
            reason: 'Customer list visibility denied'
          });
        }
      }
      return NextResponse.json({ message: error.message }, { status: error.status });
    }

    console.error('GET /api/crm/customers failed', error);

    return NextResponse.json({ message: 'Unable to load customers' }, { status: 500 });
  }
}

export async function POST(request: NextRequest) {
  try {
    const { organization, session } = await requireOrganizationAccess({
      permission: PERMISSIONS.crmCustomerCreate
    });
    const payload = customerRequestSchema.parse(await request.json());
    const created = await createCustomer(organization.id, session.user.id, payload);

    await auditCreate({
      organizationId: organization.id,
      branchId: created.branchId,
      userId: session.user.id,
      entityType: 'crm_customer',
      entityId: created.id,
      afterData: created
    });

    return NextResponse.json(
      {
        success: true,
        message: 'Customer created successfully',
        customer: created
      },
      { status: 201 }
    );
  } catch (error) {
    if (error instanceof AuthError) {
      return NextResponse.json({ message: error.message }, { status: error.status });
    }

    if (error instanceof z.ZodError) {
      return NextResponse.json(
        { message: error.issues[0]?.message ?? 'Invalid payload' },
        { status: 400 }
      );
    }

    console.error('POST /api/crm/customers failed', error);

    return NextResponse.json({ message: 'Unable to create customer' }, { status: 500 });
  }
}