# Always-on meals API: Fargate behind an ALB. GitHub Actions owns the image;
# Terraform ignores container_definitions after the bootstrap task definition.

resource "aws_ecr_repository" "api" {
  name                 = local.project
  image_tag_mutability = "MUTABLE"
  force_delete         = !local.is_prod

  image_scanning_configuration {
    scan_on_push = true
  }

  encryption_configuration {
    encryption_type = "AES256"
  }
}

resource "aws_ecr_lifecycle_policy" "api" {
  repository = aws_ecr_repository.api.name

  policy = jsonencode({
    rules = [
      {
        rulePriority = 1
        description  = "Keep the last 20 images"
        selection = {
          tagStatus   = "any"
          countType   = "imageCountMoreThan"
          countNumber = 20
        }
        action = {
          type = "expire"
        }
      }
    ]
  })
}

resource "aws_security_group" "alb" {
  name        = "${local.project}-alb"
  description = "Public ALB for meal-order-manager"
  vpc_id      = aws_vpc.this.id

  ingress {
    # CloudFront prefix lists cannot cover GitHub-hosted weekly-menu HMAC
    # publish, so this ALB is internet-reachable on :80. Flask HMAC and
    # Bearer checks are the application gate. Security review required.
    description = "HTTP from CloudFront and weekly-menu HMAC publish"
    from_port   = 80
    to_port     = 80
    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"]
  }
}

resource "aws_security_group" "api" {
  name        = "${local.project}-api"
  description = "Fargate tasks for meal-order-manager"
  vpc_id      = aws_vpc.this.id

  ingress {
    description     = "From ALB"
    from_port       = 8080
    to_port         = 8080
    protocol        = "tcp"
    security_groups = [aws_security_group.alb.id]
  }

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

resource "aws_lb" "api" {
  name               = local.project
  load_balancer_type = "application"
  idle_timeout       = 120
  security_groups    = [aws_security_group.alb.id]
  subnets            = aws_subnet.public[*].id

  drop_invalid_header_fields = true
}

resource "aws_lb_target_group" "api" {
  name        = "${local.project}-api"
  port        = 8080
  protocol    = "HTTP"
  vpc_id      = aws_vpc.this.id
  target_type = "ip"

  health_check {
    enabled             = true
    path                = "/api/health"
    matcher             = "200"
    interval            = 30
    timeout             = 5
    healthy_threshold   = 2
    unhealthy_threshold = 3
  }
}

resource "aws_lb_listener" "http" {
  load_balancer_arn = aws_lb.api.arn
  port              = 80
  protocol          = "HTTP"

  default_action {
    type             = "forward"
    target_group_arn = aws_lb_target_group.api.arn
  }
}

resource "aws_ecs_cluster" "api" {
  name = local.project

  setting {
    name  = "containerInsights"
    value = local.is_prod ? "enabled" : "disabled"
  }
}

locals {
  api_container_name = "api"
  bootstrap_command = [
    "python",
    "-c",
    "from http.server import ThreadingHTTPServer, BaseHTTPRequestHandler\nclass H(BaseHTTPRequestHandler):\n    def do_GET(self):\n        body = b'{\"stage\":\"bootstrap\",\"sha\":\"bootstrap\"}'\n        self.send_response(200)\n        self.send_header('Content-Type', 'application/json')\n        self.send_header('Content-Length', str(len(body)))\n        self.end_headers()\n        self.wfile.write(body)\nThreadingHTTPServer(('0.0.0.0', 8080), H).serve_forever()",
  ]

  api_environment = [
    { name = "STAGE", value = var.environment },
    { name = "GIT_SHA", value = "bootstrap" },
    { name = "TABLE_NAME", value = local.table_name },
    { name = "REPORTS_BUCKET", value = local.reports_bucket_name },
    { name = "SLACK_CHANNEL_PARAM", value = local.slack_channel_param },
    { name = "FORM_URL", value = local.form_url },
    { name = "SLACK_BOT_SM_NAME", value = local.slack_bot_secret_name },
    { name = "GOOGLE_CLIENT_ID_PARAM", value = local.google_client_id_param },
    { name = "PORTAL_COGNITO_ISSUER_PARAM", value = aws_ssm_parameter.portal_cognito_issuer.name },
    { name = "PORTAL_COGNITO_AUDIENCE_PARAM", value = aws_ssm_parameter.portal_cognito_audience.name },
    { name = "PORTAL_COGNITO_TRUST_PARAM", value = aws_ssm_parameter.portal_cognito_trust.name },
    { name = "PUBLISH_KEY_PARAM", value = aws_ssm_parameter.publish_key.name },
    { name = "JOBS_QUEUE_URL", value = aws_sqs_queue.jobs.id },
    { name = "CHECKCOMPONENTS_QUEUE_URL", value = var.checkcomponents_queue_url },
    { name = "AWS_DEFAULT_REGION", value = var.aws_region },
  ]
}

resource "aws_ecs_task_definition" "api" {
  family                   = local.project
  requires_compatibilities = ["FARGATE"]
  network_mode             = "awsvpc"
  cpu                      = "256"
  memory                   = "512"
  execution_role_arn       = aws_iam_role.ecs_execution.arn
  task_role_arn            = aws_iam_role.ecs_task.arn

  container_definitions = jsonencode([
    {
      name      = local.api_container_name
      image     = "public.ecr.aws/docker/library/python:3.12-slim"
      essential = true
      command   = local.bootstrap_command
      portMappings = [
        {
          containerPort = 8080
          protocol      = "tcp"
        }
      ]
      environment = local.api_environment
      logConfiguration = {
        logDriver = "awslogs"
        options = {
          "awslogs-group"         = aws_cloudwatch_log_group.api.name
          "awslogs-region"        = var.aws_region
          "awslogs-stream-prefix" = "ecs"
        }
      }
    }
  ])

  lifecycle {
    ignore_changes = [container_definitions]
  }
}

resource "aws_ecs_service" "api" {
  name            = local.project
  cluster         = aws_ecs_cluster.api.id
  task_definition = aws_ecs_task_definition.api.arn
  desired_count   = local.is_prod ? 2 : 1
  launch_type     = "FARGATE"

  network_configuration {
    subnets          = aws_subnet.public[*].id
    security_groups  = [aws_security_group.api.id]
    assign_public_ip = true
  }

  load_balancer {
    target_group_arn = aws_lb_target_group.api.arn
    container_name   = local.api_container_name
    container_port   = 8080
  }

  health_check_grace_period_seconds  = 60
  deployment_minimum_healthy_percent = local.is_prod ? 50 : 0
  deployment_maximum_percent         = 200

  lifecycle {
    ignore_changes = [task_definition, desired_count]
  }

  depends_on = [aws_lb_listener.http]
}

resource "aws_sqs_queue" "jobs_dlq" {
  name                      = "${local.project}-jobs-dlq"
  message_retention_seconds = 1209600
}

resource "aws_sqs_queue" "jobs" {
  name                       = "${local.project}-jobs"
  visibility_timeout_seconds = 180
  receive_wait_time_seconds  = 20
  redrive_policy = jsonencode({
    deadLetterTargetArn = aws_sqs_queue.jobs_dlq.arn
    maxReceiveCount     = 3
  })
}

resource "random_password" "publish_key" {
  length  = 48
  special = false
}

resource "aws_ssm_parameter" "publish_key" {
  name        = "${local.ssm_prefix}/publish-key"
  type        = "SecureString"
  value       = random_password.publish_key.result
  description = "Shared secret for /api/publish/* (weekly-menu HMAC)"
}