# ---------------------------
# VPC
# ---------------------------
resource "aws_vpc" "vpc" {
  cidr_block           = var.vpc_cidr_block
  enable_dns_hostnames = true # DNSホスト名を有効化
  tags = {
    Name = "${var.name_prefix}${var.env}-${var.vpc_name}"
  }
}

# ---------------------------
# サブネット
# ---------------------------
# パブリックサブネット1
resource "aws_subnet" "public_1a_subnet" {
  vpc_id                  = aws_vpc.vpc.id
  cidr_block              = var.public_1a_cidr
  availability_zone       = "ap-northeast-1a"
  map_public_ip_on_launch = true
  tags = {
    Name = "${var.name_prefix}${var.env}-${var.public_1a_name}"
  }
}

# パブリックサブネット2
resource "aws_subnet" "public_1c_subnet" {
  vpc_id                  = aws_vpc.vpc.id
  cidr_block              = var.public_1c_cidr
  availability_zone       = "ap-northeast-1c"
  map_public_ip_on_launch = true
  tags = {
    Name = "${var.name_prefix}${var.env}-${var.public_1c_name}"
  }
}

# プライベートサブネット1
resource "aws_subnet" "private_1a_subnet" {
  vpc_id            = aws_vpc.vpc.id
  cidr_block        = var.private_1a_cidr
  availability_zone = "ap-northeast-1a"
  tags = {
    Name = "${var.name_prefix}${var.env}-${var.private_1a_name}"
  }
}

# プライベートサブネット2
resource "aws_subnet" "private_1c_subnet" {
  vpc_id            = aws_vpc.vpc.id
  cidr_block        = var.private_1c_cidr
  availability_zone = "ap-northeast-1c"
  tags = {
    Name = "${var.name_prefix}${var.env}-${var.private_1c_name}"
  }
}

# ---------------------------
# インターネットゲートウェイ
# ---------------------------
resource "aws_internet_gateway" "igw" {
  vpc_id = aws_vpc.vpc.id
  tags = {
    Name = "${var.name_prefix}${var.env}-${var.igw_name}"
  }
}

# ---------------------------
# ルートテーブル
# ---------------------------
# パブリックサブネット用のルートテーブル
resource "aws_route_table" "public_rtb" {
  vpc_id = aws_vpc.vpc.id
  route {
    cidr_block = "0.0.0.0/0"
    gateway_id = aws_internet_gateway.igw.id
  }
  tags = {
    Name = "${var.name_prefix}${var.env}-${var.public_rtb_name}"
  }
}

# ルートテーブルの関連付け（パブリックサブネット1）
resource "aws_route_table_association" "public_1a_rtb_associate" {
  subnet_id      = aws_subnet.public_1a_subnet.id
  route_table_id = aws_route_table.public_rtb.id
}

# ルートテーブルの関連付け（パブリックサブネット2）
resource "aws_route_table_association" "public_1c_rtb_associate" {
  subnet_id      = aws_subnet.public_1c_subnet.id
  route_table_id = aws_route_table.public_rtb.id
}