# State Function defintion for Apply product revisions flow.

# Step Function (SFN) root role policy document.
data "aws_iam_policy_document" "sfn_apply_digital_product_revisions_assume_role" {
  statement {
    actions = ["sts:AssumeRole"]

    principals {
      type = "Service"
      identifiers = [
        "states.amazonaws.com",
        "lambda.amazonaws.com",
        "events.amazonaws.com",
      ]
    }
  }
}

resource "aws_iam_role" "sfn_apply_digital_product_revisions_assume_role" {
  name               = "${var.environment}-${var.sfn_apply_service_name}-state-machine-role"
  assume_role_policy = data.aws_iam_policy_document.sfn_apply_digital_product_revisions_assume_role.json
}

# Step Function (SFN) - SFN Cloudwatch logs permission policy
data "aws_iam_policy_document" "sfn_apply_digital_product_revisions_log_event_policy_document" {
  statement {
    effect    = "Allow"
    resources = [
      "arn:aws:logs:${var.aws_region}:${data.aws_caller_identity.current.account_id}:log-group:${var.environment}-${var.sfn_apply_service_name}",
      "arn:aws:logs:${var.aws_region}:${data.aws_caller_identity.current.account_id}:log-group:${var.environment}-${var.sfn_apply_service_name}:log-stream:*"
    ]

    actions = [
      "logs:CreateLogGroup",
      "logs:CreateLogStream",
      "logs:PutLogEvents"
    ]
  }
}

resource "aws_iam_role_policy" "sfn_apply_digital_product_revisions_log_event_policy_attachment" {
  name   = "${var.environment}-${var.service_name}-log-event-policy"
  role   = aws_iam_role.sfn_apply_digital_product_revisions_assume_role.id
  policy = data.aws_iam_policy_document.sfn_apply_digital_product_revisions_log_event_policy_document.json
}

# State machine lambda policy that gives the state machine role permission to invoke lambdas
# data "aws_iam_policy_document" "sfn_apply_digital_product_revisions_invoke_lambda_policy_document" {
#   statement {
#     actions = [
#       "lambda:InvokeFunction",
#     ]

#     resources = [
#       # todo: add lambdas once created
#     ]

#   }
# }

# # attach invoke lambda policy.
# resource "aws_iam_role_policy" "sfn_apply_digital_product_revisions_invoke_lambda_role_policy" {
#   name   = "${var.environment}-${var.sfn_apply_service_name}-lambda-role-policy"
#   role   = aws_iam_role.sfn_apply_digital_product_revisions_assume_role.id
#   policy = data.aws_iam_policy_document.sfn_apply_digital_product_revisions_invoke_lambda_policy_document.json
# }

resource "aws_iam_role_policy" "sfn_apply_digital_product_revisions_xray_role_policy" {
  name   = "${var.environment}-${var.sfn_apply_service_name}-xray-role-policy"
  role   = aws_iam_role.sfn_apply_digital_product_revisions_assume_role.id
  policy = data.aws_iam_policy_document.sfn_apply_digital_product_revisions_xray_policy_document.json
}

data "aws_iam_policy_document" "sfn_apply_digital_product_revisions_xray_policy_document" {
  statement {
    effect    = "Allow"
    resources = ["*"]

    actions = [
      "xray:PutTraceSegments",
      "xray:PutTelemetryRecords",
      "xray:GetSamplingRules",
      "xray:GetSamplingTargets"
    ]
  }
}

# Template for state machine.
data "template_file" "apply_digital_product_revisions_definition" {
  template = file("${path.module}/apply-digital-product-revisions.json")
  # all vars that are used in the json file.
  vars = {
    environment                  = var.environment
  }
}

resource "aws_sfn_state_machine" "apply_digital_product_revisions" {
  name       = "${var.environment}-${var.sfn_apply_service_name}"
  role_arn   = aws_iam_role.sfn_apply_digital_product_revisions_assume_role.arn
  definition = data.template_file.apply_digital_product_revisions_definition.rendered
  tags = {
    application_family = var.application_family
    environment        = var.environment
    service_name       = var.service_name
    terraformed        = true
  }
  tracing_configuration {
    enabled = true
  }
}