variable "name"   { default = "test" }
variable "region" { default = "ap-northeast-1" }

variable "vpc_cidr"      { default = "172.16.0.0/16" }
variable "az"            { default = "ap-northeast-1a" }
variable "public_subnet" { default = "172.16.0.0/24" }

variable "web_instance_type"   { default = "t2.micro" }
variable "web_instance_ami_id" { default = "ami-383c1956" }

provider "aws" {
  region = "${var.region}"
}

resource "aws_key_pair" "site_key" {
  key_name   = "${var.name}"
  public_key = "${file("site_key.pub")}"
}

resource "aws_vpc" "vpc" {
  cidr_block           = "${var.vpc_cidr}"
  enable_dns_support   = true
  enable_dns_hostnames = true
}

resource "aws_internet_gateway" "public" {
  vpc_id = "${aws_vpc.vpc.id}"
}

resource "aws_subnet" "public" {
  vpc_id                  = "${aws_vpc.vpc.id}"
  cidr_block              = "${var.public_subnet}"
  availability_zone       = "${var.az}"
  map_public_ip_on_launch = true
}

resource "aws_route_table" "public" {
  vpc_id = "${aws_vpc.vpc.id}"

  route {
    cidr_block = "0.0.0.0/0"
    gateway_id = "${aws_internet_gateway.public.id}"
  }
}

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

resource "aws_network_acl" "acl" {
  vpc_id     = "${aws_vpc.vpc.id}"
  subnet_ids = ["${aws_subnet.public.id}"]

  ingress {
    protocol   = "-1"
    rule_no    = 100
    action     = "allow"
    cidr_block = "0.0.0.0/0"
    from_port  = 0
    to_port    = 0
  }

  egress {
    protocol   = "-1"
    rule_no    = 100
    action     = "allow"
    cidr_block = "0.0.0.0/0"
    from_port  = 0
    to_port    = 0
  }
}

resource "aws_security_group" "web" {
  name        = "${var.name}-web"
  vpc_id      = "${aws_vpc.vpc.id}"
  description = "${var.name}-SG"

  ingress {
    from_port   = 22
    to_port     = 22
    protocol    = "tcp"
    cidr_blocks = ["0.0.0.0/0"]
  }

  egress {
    from_port   = 0
    to_port     = 0
    protocol    = "-1"
    cidr_blocks = ["0.0.0.0/0"]
  }
}

resource "aws_instance" "web" {
  ami                         = "${var.web_instance_ami_id}"
  instance_type               = "${var.web_instance_type}"
  vpc_security_group_ids      = ["${aws_security_group.web.id}"]
  subnet_id                   = "${aws_subnet.public.id}"
  key_name                    = "${aws_key_pair.site_key.key_name}"
  associate_public_ip_address = true

  root_block_device {
    volume_type = "gp2"
    volume_size = 8
  }

  user_data = <<EOT
#!/usr/bin/env bash

yum update -y
EOT
}

output "web_public_ip" { value = "${aws_instance.web.public_ip}" }