/**
 * Copyright 2024 Google LLC
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

locals {
  bucket = try(
    google_logging_project_bucket_config.bucket[0],
    google_logging_folder_bucket_config.bucket[0],
    google_logging_organization_bucket_config.bucket[0],
    google_logging_billing_account_bucket_config.bucket[0],
  )
  ctx = {
    for k, v in var.context : k => {
      for kk, vv in v : "${local.ctx_p}${k}:${kk}" => vv
    } if !endswith(k, "_vars")
  }
  ctx_p = "$"
  _tag_bindings = {
    for k, v in var.tag_bindings : k => lookup(local.ctx.tag_values, v, v)
  }
  location = lookup(
    local.ctx.locations, var.location, var.location
  )
  parent_id = (
    var.parent_type == "project"
    ? lookup(local.ctx.project_ids, var.parent, var.parent)
    : lookup(local.ctx.folder_ids, var.parent, var.parent)
  )
  views = {
    for k, v in var.views : k => merge(v, {
      location = coalesce(v.location, var.location)
    })
  }
}


resource "google_logging_project_bucket_config" "bucket" {
  count            = var.parent_type == "project" ? 1 : 0
  project          = local.parent_id
  location         = local.location
  retention_days   = var.retention
  bucket_id        = var.name
  description      = var.description
  enable_analytics = var.log_analytics.enable
  locked           = var.locked
  dynamic "cmek_settings" {
    for_each = var.kms_key_name == null ? [] : [""]
    content {
      kms_key_name = lookup(local.ctx.kms_keys, var.kms_key_name, var.kms_key_name)
    }
  }
}

resource "google_logging_folder_bucket_config" "bucket" {
  count          = var.parent_type == "folder" ? 1 : 0
  folder         = local.parent_id
  location       = local.location
  retention_days = var.retention
  bucket_id      = var.name
  description    = var.description
}

resource "google_logging_linked_dataset" "dataset" {
  count       = var.log_analytics.dataset_link_id != null && var.parent_type == "project" ? 1 : 0
  link_id     = var.log_analytics.dataset_link_id
  parent      = "projects/${google_logging_project_bucket_config.bucket[0].project}"
  bucket      = google_logging_project_bucket_config.bucket[0].id
  location    = local.location
  description = var.log_analytics.description
}

resource "google_logging_organization_bucket_config" "bucket" {
  count          = var.parent_type == "organization" ? 1 : 0
  organization   = local.parent_id
  location       = local.location
  retention_days = var.retention
  bucket_id      = var.name
  description    = var.description
}

resource "google_logging_billing_account_bucket_config" "bucket" {
  count           = var.parent_type == "billing_account" ? 1 : 0
  billing_account = local.parent_id
  location        = local.location
  retention_days  = var.retention
  bucket_id       = var.name
  description     = var.description
}

resource "google_logging_log_view" "views" {
  for_each    = local.views
  name        = each.key
  bucket      = local.bucket.id
  description = each.value.description
  location = lookup(
    local.ctx.locations, each.value.location, each.value.location
  )
  filter = each.value.filter
}

resource "google_tags_tag_binding" "binding" {
  for_each  = var.tag_bindings
  parent    = "//logging.googleapis.com/${local.bucket.id}"
  tag_value = templatestring(local._tag_bindings[each.key], var.context.tag_vars)
}
