route_tables.tf

resource "aws_route_table" "public_route_table" {
  vpc_id = aws_vpc.main.id
  route {
    cidr_block = "0.0.0.0/0"
    gateway_id = aws_internet_gateway.gateway.id
  }
  tags = {
    Name = "public_subnet_route_table"
  }
}

resource "aws_route_table" "private_route_table" {
  vpc_id = aws_vpc.main.id
  tags = {
    Name = "private_subnet_route_table"
  }
}

# Route in the private route table to direct traffic through the NAT Gateway
resource "aws_route" "private_route" {
  route_table_id         = aws_route_table.private_route_table.id
  destination_cidr_block = "0.0.0.0/0"
  nat_gateway_id         = aws_nat_gateway.nat_gateway.id
}

resource "aws_route_table_association" "rt_associate_public_subnet_1" {
  subnet_id      = aws_subnet.public_subnet_1.id
  route_table_id = aws_route_table.public_route_table.id
}
resource "aws_route_table_association" "rt_associate_public_subnet_2" {
  subnet_id      = aws_subnet.public_subnet_2.id
  route_table_id = aws_route_table.public_route_table.id
}
resource "aws_route_table_association" "rt_associate_public_subnet_3" {
  subnet_id      = aws_subnet.public_subnet_3.id
  route_table_id = aws_route_table.public_route_table.id
}
resource "aws_route_table_association" "rt_associate_private_subnet_1" {
  subnet_id      = aws_subnet.private_subnet_1.id
  route_table_id = aws_route_table.private_route_table.id
}
resource "aws_route_table_association" "rt_associate_private_subnet_2" {
  subnet_id      = aws_subnet.private_subnet_2.id
  route_table_id = aws_route_table.private_route_table.id
}
resource "aws_route_table_association" "rt_associate_private_subnet_3" {
  subnet_id      = aws_subnet.private_subnet_3.id
  route_table_id = aws_route_table.private_route_table.id
}