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# S3+Cloudfront 構成のサイトインフラ。独自ドメインを CNAME で Cloudfront の
# ドメインに向ける前提。
#
# 一回 `tofu apply` を実行してタイムアウトで異常終了を待ってから `tofu output`
# を実行し、 `domain_cert_validations.resource_record_*` の内容を DNS に追記。
# その後再度 `tofu apply` を実行する。
#
# SPDX-FileCopyrightText: 2025 Shota FUJI <pockawoooh@gmail.com>
# SPDX-License-Identifier: AGPL-3.0-only

variable "docs_domain" {
  description = "ドキュメントサイトをホストする最終的なドメイン"
  type        = string
}

variable "aws_region" {
  description = "デフォルトのリージョン"
  type        = string
  default     = "us-west-2"
}

terraform {
  required_providers {
    aws = {
      source  = "hashicorp/aws"
      version = "~> 5.82"
    }
  }

  required_version = ">= 1.2.0"
}

provider "aws" {
  region = var.aws_region

  default_tags {
    tags = {
      Service = "Yamori"
      Module  = "Docs"
    }
  }
}

provider "aws" {
  alias  = "us_east_1"
  region = "us-east-1"

  default_tags {
    tags = {
      Service = "Yamori"
      Module  = "Docs"
    }
  }
}

resource "aws_s3_bucket" "origin" {}

output "s3_bucket_name" {
  value = aws_s3_bucket.origin.id
}

data "aws_iam_policy_document" "s3_cf_read_policy" {
  statement {
    sid = "AllowCloudfrontReadonly"

    principals {
      type        = "Service"
      identifiers = ["cloudfront.amazonaws.com"]
    }

    actions = ["s3:GetObject"]

    resources = ["${aws_s3_bucket.origin.arn}/*"]

    condition {
      test     = "StringEquals"
      variable = "aws:SourceArn"
      values   = [aws_cloudfront_distribution.cdn.arn]
    }
  }
}

resource "aws_s3_bucket_policy" "allow_read_from_cloudfront" {
  bucket = aws_s3_bucket.origin.id
  policy = data.aws_iam_policy_document.s3_cf_read_policy.json
}

resource "aws_acm_certificate" "domain_cert" {
  # CloudFront で使う ACM は us-east-1 にある必要がある。
  # https://docs.aws.amazon.com/AmazonCloudFront/latest/DeveloperGuide/cnames-and-https-requirements.html
  provider = aws.us_east_1

  domain_name       = var.docs_domain
  validation_method = "DNS"

  lifecycle {
    create_before_destroy = true
  }
}

output "domain_cert_validations" {
  value = aws_acm_certificate.domain_cert.domain_validation_options
}

locals {
  cf_origin_id = "yamor_docs_cdn"
}

resource "aws_cloudfront_origin_access_control" "s3_oac" {
  name                              = "static_website"
  origin_access_control_origin_type = "s3"
  signing_behavior                  = "always"
  signing_protocol                  = "sigv4"
}

resource "aws_cloudfront_distribution" "cdn" {
  origin {
    domain_name              = aws_s3_bucket.origin.bucket_regional_domain_name
    origin_id                = local.cf_origin_id
    origin_access_control_id = aws_cloudfront_origin_access_control.s3_oac.id
  }

  enabled             = true
  is_ipv6_enabled     = true
  default_root_object = "index.html"
  http_version        = "http2and3"

  aliases = [var.docs_domain]

  viewer_certificate {
    acm_certificate_arn = aws_acm_certificate.domain_cert.arn
    ssl_support_method  = "sni-only"
  }

  default_cache_behavior {
    # AWS が管理している CacheOptimized ポリシー
    cache_policy_id = "658327ea-f89d-4fab-a63d-7e88639e58f6"

    allowed_methods  = ["GET", "HEAD", "OPTIONS"]
    cached_methods   = ["GET", "HEAD"]
    target_origin_id = local.cf_origin_id

    compress               = true
    viewer_protocol_policy = "redirect-to-https"

    min_ttl     = 0
    default_ttl = 31536000
    max_ttl     = 31536000
  }

  restrictions {
    geo_restriction {
      locations        = []
      restriction_type = "none"
    }
  }
}

output "cloudfront_distribution_id" {
  value = aws_cloudfront_distribution.cdn.id
}

output "cloudfront_domain" {
  value = aws_cloudfront_distribution.cdn.domain_name
}