# Static site hosting for the repertory frontend (tunes.dumpnet.chat)
# S3 static website hosting behind CloudFront (for HTTPS) + ACM cert.
# NOTE: bucket name currently matches the live hostname (repertory.dumpnet.chat)
# because it's also used as an S3-website CNAME target internally. When this
# moves to tunes.dumpnet.chat, rename the bucket + update the Route53 record
# + alt name below to match.

resource "aws_s3_bucket" "repertory_frontend" {
  bucket        = "repertory.dumpnet.chat"
  force_destroy = true
}

resource "aws_s3_bucket_website_configuration" "repertory_frontend" {
  bucket = aws_s3_bucket.repertory_frontend.id

  index_document {
    suffix = "index.html"
  }
}

resource "aws_s3_bucket_public_access_block" "repertory_frontend" {
  bucket = aws_s3_bucket.repertory_frontend.id

  block_public_acls       = false
  block_public_policy     = false
  ignore_public_acls      = false
  restrict_public_buckets = false
}

resource "aws_s3_bucket_policy" "repertory_frontend" {
  bucket = aws_s3_bucket.repertory_frontend.id
  policy = jsonencode({
    Version = "2012-10-17"
    Statement = [
      {
        Sid       = "PublicReadGetObject"
        Effect    = "Allow"
        Principal = "*"
        Action    = "s3:GetObject"
        Resource  = "${aws_s3_bucket.repertory_frontend.arn}/*"
      }
    ]
  })
  depends_on = [aws_s3_bucket_public_access_block.repertory_frontend]
}

# --- ACM cert for CloudFront (must be in us-east-1, which this provider already is) ---

resource "aws_acm_certificate" "repertory_frontend" {
  domain_name       = "repertory.${var.domain}"
  validation_method = "DNS"

  lifecycle {
    create_before_destroy = true
  }
}

resource "aws_route53_record" "repertory_frontend_cert_validation" {
  for_each = {
    for dvo in aws_acm_certificate.repertory_frontend.domain_validation_options : dvo.domain_name => {
      name   = dvo.resource_record_name
      record = dvo.resource_record_value
      type   = dvo.resource_record_type
    }
  }

  zone_id = data.aws_route53_zone.dumpnet.zone_id
  name    = each.value.name
  type    = each.value.type
  records = [each.value.record]
  ttl     = 300
}

resource "aws_acm_certificate_validation" "repertory_frontend" {
  certificate_arn         = aws_acm_certificate.repertory_frontend.arn
  validation_record_fqdns = [for r in aws_route53_record.repertory_frontend_cert_validation : r.fqdn]
}

# --- CloudFront distribution in front of the S3 website endpoint ---

resource "aws_cloudfront_distribution" "repertory_frontend" {
  enabled             = true
  default_root_object = "index.html"
  aliases             = ["repertory.${var.domain}"]

  origin {
    domain_name = aws_s3_bucket_website_configuration.repertory_frontend.website_endpoint
    origin_id   = "repertory-frontend-s3-website"

    custom_origin_config {
      http_port              = 80
      https_port              = 443
      origin_protocol_policy  = "http-only" # S3 website endpoints are HTTP-only
      origin_ssl_protocols    = ["TLSv1.2"]
    }
  }

  default_cache_behavior {
    allowed_methods        = ["GET", "HEAD"]
    cached_methods          = ["GET", "HEAD"]
    target_origin_id        = "repertory-frontend-s3-website"
    viewer_protocol_policy  = "redirect-to-https"

    forwarded_values {
      query_string = false
      cookies {
        forward = "none"
      }
    }
  }

  restrictions {
    geo_restriction {
      restriction_type = "none"
    }
  }

  viewer_certificate {
    acm_certificate_arn      = aws_acm_certificate_validation.repertory_frontend.certificate_arn
    ssl_support_method       = "sni-only"
    minimum_protocol_version = "TLSv1.2_2021"
  }
}

resource "aws_route53_record" "repertory_frontend" {
  zone_id = data.aws_route53_zone.dumpnet.zone_id
  name    = "repertory.${var.domain}"
  type    = "A"

  alias {
    name                   = aws_cloudfront_distribution.repertory_frontend.domain_name
    zone_id                = aws_cloudfront_distribution.repertory_frontend.hosted_zone_id
    evaluate_target_health = false
  }
}

output "repertory_frontend_bucket" {
  value = aws_s3_bucket.repertory_frontend.id
}

output "repertory_frontend_website_endpoint" {
  value = aws_s3_bucket_website_configuration.repertory_frontend.website_endpoint
}

output "repertory_frontend_cloudfront_domain" {
  value = aws_cloudfront_distribution.repertory_frontend.domain_name
}