class FCM

# File lib/fcm.rb, line 15
def initialize(json_key_path = "", project_name = "", http_options = {})
  @json_key_path = json_key_path
  @project_name = project_name
  @http_options = http_options
end

# File lib/fcm.rb, line 79
def add_registration_ids(key_name, project_id, notification_key, registration_ids)
  post_body = build_post_body(registration_ids, operation: "add",
                                                notification_key_name: key_name,
                                                notification_key: notification_key)

  extra_headers = {
    "project_id" => project_id,
  }

  for_uri(GROUP_NOTIFICATION_BASE_URI, extra_headers) do |connection|
    response = connection.post("/gcm/notification", post_body.to_json)
    build_response(response)
  end
end

# File lib/fcm.rb, line 139
def batch_topic_subscription(topic, registration_tokens)
  manage_topics_relationship(topic, registration_tokens, 'Add')
end

# File lib/fcm.rb, line 143
def batch_topic_unsubscription(topic, registration_tokens)
  manage_topics_relationship(topic, registration_tokens, 'Remove')
end

# File lib/fcm.rb, line 63
def create_notification_key(key_name, project_id, registration_ids = [])
  post_body = build_post_body(registration_ids, operation: "create",
                                                notification_key_name: key_name)

  extra_headers = {
    "project_id" => project_id,
  }

  for_uri(GROUP_NOTIFICATION_BASE_URI, extra_headers) do |connection|
    response = connection.post("/gcm/notification", post_body.to_json)
    build_response(response)
  end
end

# File lib/fcm.rb, line 156
def get_instance_id_info(iid_token, options = {})
  params = options

  for_uri(INSTANCE_ID_API) do |connection|
    response = connection.get("/iid/info/#{iid_token}", params)
    build_response(response)
  end
end

# File lib/fcm.rb, line 147
def manage_topics_relationship(topic, registration_tokens, action)
  body = { to: "/topics/#{topic}", registration_tokens: registration_tokens }

  for_uri(INSTANCE_ID_API) do |connection|
    response = connection.post("/iid/v1:batch#{action}", body.to_json)
    build_response(response)
  end
end

# File lib/fcm.rb, line 113
def recover_notification_key(key_name, project_id)
  params = { notification_key_name: key_name }

  extra_headers = {
    "project_id" => project_id,
  }

  for_uri(GROUP_NOTIFICATION_BASE_URI, extra_headers) do |connection|
    response = connection.get("/gcm/notification", params)
    build_response(response)
  end
end

# File lib/fcm.rb, line 96
def remove_registration_ids(key_name, project_id, notification_key, registration_ids)
  post_body = build_post_body(registration_ids, operation: "remove",
                                                notification_key_name: key_name,
                                                notification_key: notification_key)

  extra_headers = {
    "project_id" => project_id,
  }

  for_uri(GROUP_NOTIFICATION_BASE_URI, extra_headers) do |connection|
    response = connection.post("/gcm/notification", post_body.to_json)
    build_response(response)
  end
end

# File lib/fcm.rb, line 49
def send_notification_v1(message)
  return if @project_name.empty?

  post_body = { 'message': message }
  for_uri(BASE_URI_V1) do |connection|
    response = connection.post(
      "#{@project_name}/messages:send", post_body.to_json
    )
    build_response(response)
  end
end

# File lib/fcm.rb, line 165
def send_to_topic(topic, options = {})
  if topic.gsub(TOPIC_REGEX, '').length.zero?
    body = { 'message': { 'topic': topic }.merge(options) }

    for_uri(BASE_URI_V1) do |connection|
      response = connection.post(
        "#{@project_name}/messages:send", body.to_json
      )
      build_response(response)
    end
  end
end

# File lib/fcm.rb, line 178
def send_to_topic_condition(condition, options = {})
  if validate_condition?(condition)
    body = { 'message': { 'condition': condition }.merge(options) }

    for_uri(BASE_URI_V1) do |connection|
      response = connection.post(
        "#{@project_name}/messages:send", body.to_json
      )
      build_response(response)
    end
  end
end

# File lib/fcm.rb, line 126
def topic_subscription(topic, registration_token)
  for_uri(INSTANCE_ID_API) do |connection|
    response = connection.post(
      "/iid/v1/#{registration_token}/rel/topics/#{topic}"
    )
    build_response(response)
  end
end

# File lib/fcm.rb, line 135
def topic_unsubscription(topic, registration_token)
  batch_topic_unsubscription(topic, [registration_token])
end

# File lib/fcm.rb, line 235
def build_canonical_ids(body, registration_ids)
  canonical_ids = []
  unless body.empty?
    if body["canonical_ids"] > 0
      body["results"].each_with_index do |result, index|
        canonical_ids << { old: registration_ids[index], new: result["registration_id"] } if has_canonical_id?(result)
      end
    end
  end
  canonical_ids
end

# File lib/fcm.rb, line 247
def build_not_registered_ids(body, registration_id)
  not_registered_ids = []
  unless body.empty?
    if body["failure"] > 0
      body["results"].each_with_index do |result, index|
        not_registered_ids << registration_id[index] if is_not_registered?(result)
      end
    end
  end
  not_registered_ids
end

# File lib/fcm.rb, line 209
def build_post_body(registration_ids, options = {})
  ids = registration_ids.is_a?(String) ? [registration_ids] : registration_ids
  { registration_ids: ids }.merge(options)
end

# File lib/fcm.rb, line 214
def build_response(response, registration_ids = [])
  body = response.body || {}
  response_hash = { body: body, headers: response.headers, status_code: response.status }
  case response.status
  when 200
    response_hash[:response] = "success"
    body = JSON.parse(body) unless body.empty?
    response_hash[:canonical_ids] = build_canonical_ids(body, registration_ids) unless registration_ids.empty?
    response_hash[:not_registered_ids] = build_not_registered_ids(body, registration_ids) unless registration_ids.empty?
  when 400
    response_hash[:response] = "Only applies for JSON requests. Indicates that the request could not be parsed as JSON, or it contained invalid fields."
  when 401
    response_hash[:response] = "There was an error authenticating the sender account."
  when 503
    response_hash[:response] = "Server is temporarily unavailable."
  when 500..599
    response_hash[:response] = "There was an internal error in the FCM server while trying to process the request."
  end
  response_hash
end

# File lib/fcm.rb, line 193
def for_uri(uri, extra_headers = {})
  connection = ::Faraday.new(
    url: uri,
    request: { timeout: @http_options.fetch(:timeout, DEFAULT_TIMEOUT) }
  ) do |faraday|
    faraday.adapter Faraday.default_adapter
    faraday.headers["Content-Type"] = "application/json"
    faraday.headers["Authorization"] = "Bearer #{jwt_token}"
    faraday.headers["access_token_auth"]= "true"
    extra_headers.each do |key, value|
      faraday.headers[key] = value
    end
  end
  yield connection
end

# File lib/fcm.rb, line 259
def has_canonical_id?(result)
  !result["registration_id"].nil?
end

# File lib/fcm.rb, line 263
def is_not_registered?(result)
  result["error"] == "NotRegistered"
end

# File lib/fcm.rb, line 294
def json_key
  @json_key ||= if @json_key_path.respond_to?(:read)
                  @json_key_path
                else
                  File.open(@json_key_path)
                end
end

# File lib/fcm.rb, line 284
def jwt_token
  scope = "https://www.googleapis.com/auth/firebase.messaging"
  @authorizer ||= Google::Auth::ServiceAccountCredentials.make_creds(
    json_key_io: json_key,
    scope: scope,
  )
  token = @authorizer.fetch_access_token!
  token["access_token"]
end

# File lib/fcm.rb, line 267
def validate_condition?(condition)
  validate_condition_format?(condition) && validate_condition_topics?(condition)
end

# File lib/fcm.rb, line 271
def validate_condition_format?(condition)
  bad_characters = condition.gsub(
    /(topics|in|\s|\(|\)|(&&)|[!]|(\|\|)|'([a-zA-Z0-9\-_.~%]+)')/,
    ""
  )
  bad_characters.length == 0
end

# File lib/fcm.rb, line 279
def validate_condition_topics?(condition)
  topics = condition.scan(/(?:^|\S|\s)'([^']*?)'(?:$|\S|\s)/).flatten
  topics.all? { |topic| topic.gsub(TOPIC_REGEX, "").length == 0 }
end