vpc.tf

# ==============================================================================
# VPC
# ==============================================================================
resource "aws_vpc" "main" {
  cidr_block           = var.vpc_cidr
  enable_dns_hostnames = var.vpc_enable_dns_hostnames

  tags = merge(
    var.tags,
    {
      Name = "${var.prefix}_vpc"
    }
  )
}

# ==============================================================================
# SUBNETS
# ==============================================================================
resource "aws_subnet" "public" {
  vpc_id                  = aws_vpc.main.id
  cidr_block              = var.public_subnet_cidr
  availability_zone       = "us-east-1a"
  map_public_ip_on_launch = true

  tags = merge(
    var.tags,
    {
      Name = "${var.prefix}_public_subnet"
    }
  )
}

resource "aws_subnet" "private" {
  vpc_id            = aws_vpc.main.id
  cidr_block        = var.private_subnet_cidr
  availability_zone = "us-east-1a"

  tags = merge(
    var.tags,
    {
      Name = "${var.prefix}_private_subnet"
    }
  )
}

# ==============================================================================
# INTERNET GATEWAY
# ==============================================================================
resource "aws_internet_gateway" "igw" {
  vpc_id = aws_vpc.main.id

  tags = merge(
    var.tags,
    {
      Name = "${var.prefix}_igw"
    }
  )
}

# ==============================================================================
# ROUTE TABLES
# ==============================================================================
resource "aws_route_table" "public" {
  vpc_id = aws_vpc.main.id

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

  tags = merge(
    var.tags,
    {
      Name = "${var.prefix}_public_route_table"
    }
  )
}

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

  tags = merge(
    var.tags,
    {
      Name = "${var.prefix}_private_route_table"
    }
  )
}

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

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

# ==============================================================================
# SECURITY GROUPS
# ==============================================================================
resource "aws_security_group" "private_sg" {
  vpc_id      = aws_vpc.main.id
  description = "${var.prefix} - Security group for private subnet"

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

  tags = merge(
    var.tags,
    {
      Name = "${var.prefix}_private_sg"
    }
  )
}