2Subnet-2AZ

resource "aws_vpc" "main" {
  cidr_block = "10.0.0.0/16"

  enable_dns_hostnames = true
  enable_dns_support = true

  tags = {
    Name = "<env>-vpc"
  }
}

# Public

## Internet Gateway
resource"aws_internet_gateway" "main" {
  vpc_id = aws_vpc.main.id

  tags = {
    Name = "<env>-igw"
  }
}

## Route Table
resource "aws_route_table" "public" {
  vpc_id = aws_vpc.main.id

  tags = {
    Name = "<env>-public-rt"
  }
}
 
resource "aws_route" "public" {
  route_table_id = aws_route_table.public.id
  destination_cidr_block = "0.0.0.0/0"
  gateway_id = aws_internet_gateway.main.id
}

## Public Subnet
resource "aws_subnet" "public_a" {
  vpc_id = aws_vpc.main.id
  cidr_block = "10.0.2.0/24"
  availability_zone = "ap-northeast-2a"
  map_public_ip_on_launch = true

  tags = {
    Name = "<env>-public-a"
  }
}

resource "aws_subnet" "public_b" {
  vpc_id = aws_vpc.main.id
  cidr_block = "10.0.3.0/24"
  availability_zone = "ap-northeast-2b"
  map_public_ip_on_launch = true

  tags = {
    Name = "<env>-public-b"
  }
}

## Attach Public Subnet in Route Table
resource "aws_route_table_association" "public_a" {
  subnet_id = aws_subnet.public_a.id
  route_table_id = aws_route_table.public.id
}

resource "aws_route_table_association" "public_b" {
  subnet_id = aws_subnet.public_b.id
  route_table_id = aws_route_table.public.id
}


# Private

## Elastic IP
resource "aws_eip" "private_a" {
}

resource "aws_eip" "private_b" {
}


## NAT Gateway
resource "aws_nat_gateway" "private_a" {
  depends_on = [aws_internet_gateway.main]

  allocation_id = aws_eip.private_a.id
  subnet_id = aws_subnet.public_a.id

  tags = {
    Name = "<env>-nat-a"
  }
}

resource "aws_nat_gateway" "private_b" {
  depends_on = [aws_internet_gateway.main]

  allocation_id = aws_eip.private_b.id
  subnet_id = aws_subnet.public_b.id

  tags = {
    Name = "<env>-nat-b"
  }
}

## Route Table
resource "aws_route_table" "private_a" {
  vpc_id = aws_vpc.main.id

  tags = {
    Name = "<env>-private-a-rt"
  }
}

resource "aws_route_table" "private_b" {
  vpc_id = aws_vpc.main.id

  tags = {
    Name = "<env>-private-b-rt"
  }
}

resource "aws_route" "private_a" {
  route_table_id = aws_route_table.private_a.id
  destination_cidr_block = "0.0.0.0/0"
  nat_gateway_id = aws_nat_gateway.private_a.id
}

resource "aws_route" "private_b" {
  route_table_id = aws_route_table.private_b.id
  destination_cidr_block = "0.0.0.0/0"
  nat_gateway_id = aws_nat_gateway.private_b.id
}

resource "aws_subnet" "private_a" {
  vpc_id = aws_vpc.main.id
  cidr_block = "10.0.0.0/24"
  availability_zone = "ap-northeast-2a"

  tags = {
    Name = "<env>-private-a"
  }
}

resource "aws_subnet" "private_b" {
  vpc_id = aws_vpc.main.id
  cidr_block = "10.0.1.0/24"
  availability_zone = "ap-northeast-2b"

  tags = {
    Name = "<env>-private-b"
  }
}

## Attach Private Subnet in Route Table
resource "aws_route_table_association" "private_a" {
  subnet_id = aws_subnet.private_a.id
  route_table_id = aws_route_table.private_a.id
}

resource "aws_route_table_association" "private_b" {
  subnet_id = aws_subnet.private_b.id
  route_table_id = aws_route_table.private_b.id
}

# OutPut

## VPC
output "aws_vpc" {
  value = aws_vpc.main.id
}

## Public Subnet
output "public_a" {
  value = aws_subnet.public_a.id
}

output "public_b" {
  value = aws_subnet.public_b.id
}

## Private Subnet
output "private_a" {
  value = aws_subnet.private_a.id
}

output "private_b" {
  value = aws_subnet.private_b.id
}
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