data "oci_core_services" "oracle_services" {
  filter {
    name   = "name"
    values = ["All .* Services In Oracle Services Network"]
    regex  = true
  }
}

resource "oci_core_vcn" "this" {
  compartment_id = var.compartment_id
  cidr_block     = var.vcn_cidr
  display_name   = "${var.name_prefix}-vcn"
  dns_label      = replace(var.name_prefix, "-", "")
  freeform_tags  = var.freeform_tags
}

resource "oci_core_nat_gateway" "this" {
  compartment_id = var.compartment_id
  vcn_id         = oci_core_vcn.this.id
  display_name   = "${var.name_prefix}-nat"
  freeform_tags  = var.freeform_tags
}

resource "oci_core_service_gateway" "this" {
  compartment_id = var.compartment_id
  vcn_id         = oci_core_vcn.this.id
  display_name   = "${var.name_prefix}-service-gateway"
  freeform_tags  = var.freeform_tags

  services {
    service_id = data.oci_core_services.oracle_services.services[0].id
  }
}

resource "oci_core_internet_gateway" "this" {
  count = var.create_public_subnet ? 1 : 0

  compartment_id = var.compartment_id
  vcn_id         = oci_core_vcn.this.id
  display_name   = "${var.name_prefix}-igw"
  enabled        = true
  freeform_tags  = var.freeform_tags
}

resource "oci_core_route_table" "private" {
  compartment_id = var.compartment_id
  vcn_id         = oci_core_vcn.this.id
  display_name   = "${var.name_prefix}-private-rt"
  freeform_tags  = var.freeform_tags

  route_rules {
    destination       = "0.0.0.0/0"
    destination_type  = "CIDR_BLOCK"
    network_entity_id = oci_core_nat_gateway.this.id
  }

  route_rules {
    destination       = data.oci_core_services.oracle_services.services[0].cidr_block
    destination_type  = "SERVICE_CIDR_BLOCK"
    network_entity_id = oci_core_service_gateway.this.id
  }
}

resource "oci_core_route_table" "public" {
  count = var.create_public_subnet ? 1 : 0

  compartment_id = var.compartment_id
  vcn_id         = oci_core_vcn.this.id
  display_name   = "${var.name_prefix}-public-rt"
  freeform_tags  = var.freeform_tags

  route_rules {
    destination       = "0.0.0.0/0"
    destination_type  = "CIDR_BLOCK"
    network_entity_id = oci_core_internet_gateway.this[0].id
  }
}

resource "oci_core_security_list" "private" {
  compartment_id = var.compartment_id
  vcn_id         = oci_core_vcn.this.id
  display_name   = "${var.name_prefix}-private-sl"
  freeform_tags  = var.freeform_tags

  egress_security_rules {
    destination = "0.0.0.0/0"
    protocol    = "6"
  }
}

resource "oci_core_security_list" "public" {
  count = var.create_public_subnet ? 1 : 0

  compartment_id = var.compartment_id
  vcn_id         = oci_core_vcn.this.id
  display_name   = "${var.name_prefix}-public-sl"
  freeform_tags  = var.freeform_tags

  egress_security_rules {
    destination = "0.0.0.0/0"
    protocol    = "6"
  }
}

resource "oci_core_subnet" "private" {
  compartment_id             = var.compartment_id
  vcn_id                     = oci_core_vcn.this.id
  cidr_block                 = var.private_subnet_cidr
  display_name               = "${var.name_prefix}-private-subnet"
  dns_label                  = "private"
  prohibit_public_ip_on_vnic = true
  route_table_id             = oci_core_route_table.private.id
  security_list_ids          = [oci_core_security_list.private.id]
  freeform_tags              = var.freeform_tags
}

resource "oci_core_subnet" "public" {
  count = var.create_public_subnet ? 1 : 0

  compartment_id             = var.compartment_id
  vcn_id                     = oci_core_vcn.this.id
  cidr_block                 = var.public_subnet_cidr
  display_name               = "${var.name_prefix}-public-subnet"
  dns_label                  = "public"
  prohibit_public_ip_on_vnic = false
  route_table_id             = oci_core_route_table.public[0].id
  security_list_ids          = [oci_core_security_list.public[0].id]
  freeform_tags              = var.freeform_tags
}

resource "oci_core_network_security_group" "app" {
  compartment_id = var.compartment_id
  vcn_id         = oci_core_vcn.this.id
  display_name   = "${var.name_prefix}-app-nsg"
  freeform_tags  = var.freeform_tags
}

resource "oci_core_network_security_group" "database" {
  compartment_id = var.compartment_id
  vcn_id         = oci_core_vcn.this.id
  display_name   = "${var.name_prefix}-database-nsg"
  freeform_tags  = var.freeform_tags
}

resource "oci_core_network_security_group_security_rule" "app_to_database" {
  network_security_group_id = oci_core_network_security_group.database.id
  direction                 = "INGRESS"
  protocol                  = "6"
  source                    = oci_core_network_security_group.app.id
  source_type               = "NETWORK_SECURITY_GROUP"

  tcp_options {
    destination_port_range {
      min = var.adb_port
      max = var.adb_port
    }
  }
}

resource "oci_core_network_security_group_security_rule" "database_egress_oracle_services" {
  network_security_group_id = oci_core_network_security_group.database.id
  direction                 = "EGRESS"
  protocol                  = "6"
  destination               = data.oci_core_services.oracle_services.services[0].cidr_block
  destination_type          = "SERVICE_CIDR_BLOCK"
}

resource "oci_core_network_security_group_security_rule" "app_egress_https" {
  network_security_group_id = oci_core_network_security_group.app.id
  direction                 = "EGRESS"
  protocol                  = "6"
  destination               = "0.0.0.0/0"
  destination_type          = "CIDR_BLOCK"

  tcp_options {
    destination_port_range {
      min = 443
      max = 443
    }
  }
}