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# terraform {
#   required_providers {
#     bluecat = {
#       source = "umich-vci/bluecat"
#       version = "0.1.0"
#     }
#   }
# }

# provider "bluecat" {
#     bluecat_endpoint = "bluecat.umnet.umich.edu"
# }
locals {
    short_mcomm = lower(replace(split("@", var.mcomm_group_email)[0],".","-"))

    project_id_prefix = "${var.division}-audit-"
    project_id_customer = substr(local.short_mcomm,0,30-5-length(local.project_id_prefix))
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    project_id = "${local.project_id_prefix}${local.project_id_customer}-${random_id.id.hex}"
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    project_name = substr("${var.division} Audit ${local.short_mcomm}",0,30)

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    security_contact = "security@umich.edu"
    # customer_service_account_id = "${local.customer_service_account_prefix}${local.customer_service_account_suffix}"
    filter_string = "Change_Me_to_Send_Additional_Logs_to_Splunk; Leave_Exclusions_in_Place_PLEASE"
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    log_filter_list = [
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      "log_id(\"cloudaudit.googleapis.com/activity\")",
      "log_id(\"externalaudit.googleapis.com/activity\")",
      "log_id(\"cloudaudit.googleapis.com/system_event\")", 
      "log_id(\"externalaudit.googleapis.com/system_event\")",
      "log_id(\"cloudaudit.googleapis.com/access_transparency\")",
      "log_id(\"externalaudit.googleapis.com/access_transparency\")",
      "log_id(\"cloudaudit.googleapis.com/data_access\")",
      "log_id (\"externalaudit.googleapis.com/data_access\")",
      "log_id(\"compute.googleapis.com/vpc_flows\")",
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    ]
    log_filters = join(" OR ", local.log_filter_list)

    curl_body           = {
        kind               = "project"
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        security_contact   = local.security_contact
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        mcomm_group_email  = var.mcomm_group_email
        shortcode          = var.shortcode
        vpn                = false 
        dt_phi             = true
        dt_ferpa           = false
        dt_pii             = false
        dt_glba            = false
        dt_hsr             = false
        dt_ssn             = false
        dt_acp             = false
        dt_it_sec_info     = true
        dt_itar            = false
        dt_pci             = false
        dt_fisma           = false
        dt_other_data      = false
        dt_other_data_info = ""
    }
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    log_export_project = split("/",local.log_export_destination[var.environment][var.division])[2]
    
    log_export_destination = {
        //dev = ""
        test = {
            its               = "pubsub.googleapis.com/projects/gcp-at-um-mon/topics/gcp-at-um-logs-test"
            campus            = "pubsub.googleapis.com/projects/gcp-at-um-mon/topics/gcp-at-um-logs-test"
            michigan_medicine = "pubsub.googleapis.com/projects/gcp-at-um-mon/topics/gcp-at-um-logs-test"
            hipaa             = "pubsub.googleapis.com/projects/gcp-at-um-mon/topics/hipaa-logs-test"
        } 
        prod = {
            its               = "pubsub.googleapis.com/projects/gcp-at-um-mon/topics/gcp-at-um-logs-prod"
            campus            = "pubsub.googleapis.com/projects/gcp-at-um-mon/topics/gcp-at-um-logs-prod"
            michigan_medicine = "pubsub.googleapis.com/projects/gcp-at-um-mon/topics/gcp-at-um-logs-prod"
            hipaa             = "pubsub.googleapis.com/projects/gcp-at-um-mon/topics/hipaa-logs-prod" # "pubsub.googleapis.com/projects/${var.division}-logs-${var.environment}" 
        } 
    }
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}

resource "google_project" "gcp_project" {    
    name = local.project_name
    project_id = local.project_id
    folder_id = var.folder_id
    billing_account = var.billing_id
    auto_create_network = false
    labels = {
        "shortcode" = var.shortcode 
    }
}

data "google_service_account_id_token" "customer_db_token" {
    target_audience = var.database_function_url
}

resource "null_resource" "customer_database" {
    triggers = {
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        security_contact = local.security_contact
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        mcomm_group_email = var.mcomm_group_email
        shortcode = var.shortcode
    }

    provisioner "local-exec" {
        command = "curl ${var.database_function_url} -H \"Authorization: Bearer ${data.google_service_account_id_token.customer_db_token.id_token}\" -H \"Content-Type: application/json\" -d '${jsonencode(local.curl_body)}'"
    }
}


resource "google_project_iam_member" "project_iam" {
    project = google_project.gcp_project.project_id
    role    = "roles/editor"
    member  = "group:${var.mcomm_group_email}"
}

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# # Create logging config # # - use Google Module to create export to splunk
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# module "gcp-at-um-project" {
#     count = var.division == "hipaa" ? 1 : 0
#     source = "/mnt/c/Users/kenmoore/Documents/code/projects/terraform-google-gcp-at-um-project"
#     project_name = "${var.division}-audit-${local.short_mcomm}"
#     # project_id = ""
#     folder_id = google_folder.customer_folder.id # "958858037302" # module.gcp-at-um-customer.google_folder.customer_folder.folder_id # need to get this from the customer module    
#     mcomm_group_email = "gcp.admins@umich.edu" # need a var for auditors for hipaa?
#     billing_id = "010AF9-D1F2C5-DCC86F" # should be from output - billing_account_id
#     security_contact = "mjsager@umich.edu"
#     egress_waiver = true
#     red_hat_byol = false
#     shortcode = "048843"
#     requestor = "kenmoore@umich.edu"      
#     vpn = false    
#     log_export_destination = "pubsub.googleapis.com/projects/gcp-at-um-mon/topics/hipaa-logs-test"
# }

# working on lien on audit project
resource "google_resource_manager_lien" "project_lien" {
    parent = "projects/${google_project.gcp_project.project_id}"
    restrictions = ["resourcemanager.projects.delete"]
    origin = "Per HIPAA recommendation/requirements; Prevent deletion of ${google_project.gcp_project.project_id}"
    reason = "${google_project.gcp_project.project_id} holds the audit logs for HIPAA customer folder id ${var.folder_id}"
}

resource "random_id" "id" {
    byte_length = 2
}

resource "google_logging_folder_sink" "hipaa_customer_logs" {
    name   = "${var.division}-audit-${local.short_mcomm}"
    description = "Aggregated Log Sink - HIPAA Customer Logs"
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    folder = var.folder_id
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    # include logs from all projects in folder
    include_children = true

    # send to GCS bucket in audit project
    destination = "storage.googleapis.com/${google_storage_bucket.hipaa_customer_logs.name}"
    
    filter = local.log_filters
}

resource "google_storage_bucket" "hipaa_customer_logs" {    
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    project                     = google_project.gcp_project.project_id
    name                        = "${var.division}-audit-${local.short_mcomm}-${random_id.id.hex}"
    location                    = "US-CENTRAL1"    
    force_destroy               = false
    uniform_bucket_level_access = true
    storage_class               = "COLDLINE"
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    retention_policy {
        retention_period = "95000000" # just over 3 years
    }
    
    lifecycle_rule {
        action {
          type = "SetStorageClass"
          storage_class = "ARCHIVE"
        }
        condition {
          age = 180
        }
    }

    lifecycle_rule {
        action {
          type = "Delete"          
        }
        condition {
          age = 1100 # just over 3 x 365 days = 3 years (slightly more than the retention policy)
        }
    }
}

resource "google_project_iam_binding" "hipaa_customer_log_writer" {
    project = google_project.gcp_project.project_id
    role    = "roles/storage.objectCreator"

    members = [
      google_logging_folder_sink.hipaa_customer_logs.writer_identity,
    ]
}
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resource "google_logging_project_sink" "log_export" {    
    project = google_project.gcp_project.project_id
    # name = "${google_project.gcp_project.project_id}-log-export"        
    name = "log-export-splunk"
    destination = local.log_export_destination[var.environment][var.division]    
    filter = local.filter_string # if adding filter to match nothing; use in conjunction with aggregated log sink + exclusion filter    
    exclusions {
        name        = "Aggregated_Logs_Exclusion"
        description = "Excluding logs already captured by aggregated log sink (at folder). Please DO NOT alter/remove."
        filter      = local.log_filters
    }
    unique_writer_identity = true    
}


resource "google_pubsub_topic_iam_member" "publisher" {
    project = local.log_export_project
    topic = local.log_export_destination[var.environment][var.division] 
    role = "roles/pubsub.publisher"
    member = google_logging_project_sink.log_export.writer_identity      
}