##############################
# This script setup whole infrastructure on AWS to run ec2 instance this will include VPC Setup
# (Including : "VPC", "Subnet", "internet Gateway", "Route Table", "Security Group to allow SSH")
# also it sets up EC2 Instance along with keypairs
##############################
### Provider Setup
provider "aws" {
  region = "us-east-2"
}
### Variables declearation
variable "cidr_vpc" {
  description = "CIDR block for the VPC"
  default = "192.168.0.0/16"
}
variable "cidr_subnet" {
  description = "CIDR block for the subnet"
  default = "192.168.1.0/24"
}
variable "availability_zone" {
  description = "availability zone to create subnet"
  default = "us-east-2a"
}

variable "instance_type" {
  description = "type for aws EC2 instance"
  default = "t2.micro"
}
variable "environment_tag" {
  description = "Environment tag"
  default = "Production"
}
variable "public_key_path" {
  description = "Public key path"
  default = "/Users/krypton/.ssh/id_rsa.pub"
}
### ++++++++++++++++++
### Keypair creation
resource "aws_key_pair" "ec2key" {
  key_name = "publicKey"
  public_key = "${file(var.public_key_path)}"
}

#### AWS VPC Creation
resource "aws_vpc" "vpc" {
  cidr_block = "${var.cidr_vpc}"
  enable_dns_support   = true
  enable_dns_hostnames = true
  tags = {
    Environment = "${var.environment_tag}"
  }
}

resource "aws_internet_gateway" "igw" {
  vpc_id = "${aws_vpc.vpc.id}"
  tags = {
    Environment = "${var.environment_tag}"
  }
}

### ++++++++++++++++++

#### Subnet Creation
resource "aws_subnet" "subnet_public" {
  vpc_id = "${aws_vpc.vpc.id}"
  cidr_block = "${var.cidr_subnet}"
  map_public_ip_on_launch = "true"
  availability_zone = "${var.availability_zone}"
  tags = {
    Environment = "${var.environment_tag}"
  }
}
### ++++++++++++++++++

#### Route Table Creation

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

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

tags = {
    Environment = "${var.environment_tag}"
  }
}
### ++++++++++++++++++

#### Route Table Association
resource "aws_route_table_association" "rta_subnet_public" {
  subnet_id      = "${aws_subnet.subnet_public.id}"
  route_table_id = "${aws_route_table.rtb_public.id}"
}
### ++++++++++++++++++

#### Security Group
resource "aws_security_group" "sg_22" {
  name = "sg_22"
  vpc_id = "${aws_vpc.vpc.id}"

  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"]
  }

  tags = {
    Environment = "${var.environment_tag}"
  }
}
### ++++++++++++++++

#### AMI naming setup
data "aws_ami" "ubuntu" {
  most_recent = true

  filter {
    name   = "name"
    values = ["ubuntu/images/hvm-ssd/ubuntu-trusty-14.04-amd64-server-*"]
  }

  filter {
    name   = "virtualization-type"
    values = ["hvm"]
  }
  owners = ["099720109477"]
}
## ++++++++++++++

#### EC2 Launch Defination
resource "aws_instance" "web-1" {
  ami = "${data.aws_ami.ubuntu.id}"
  instance_type = "t2.micro"
  key_name = "${aws_key_pair.ec2key.key_name}"
  subnet_id = "${aws_subnet.subnet_public.id}"
  vpc_security_group_ids = ["${aws_security_group.sg_22.id}"]
}
## ++++++++++++++