module GdsApi::TestHelpers::EmailAlertApi

def apply_subscription_defaults(subscription)
  parameters = {
    title: "Some title",
    subscriber_id: 1,
    subscriber_list_id: 1000,
    ended: true,
  }.merge(subscription)
  # Strip out ID as subsequent call to `get_subscription_response` throws `ArgumentError`
  id = parameters.delete(:id)
  [id, parameters]
end

def assert_email_alert_api_content_change_created(attributes = nil)
  if attributes
    matcher = lambda do |request|
      payload = JSON.parse(request.body)
      payload.select { |k, _| attributes.key?(k) } == attributes
    end
  end
  assert_requested(:post, "#{EMAIL_ALERT_API_ENDPOINT}/content-changes", times: 1, &matcher)
end

def assert_email_alert_api_message_created(attributes = nil)
  if attributes
    matcher = lambda do |request|
      payload = JSON.parse(request.body)
      payload.select { |k, _| attributes.key?(k) } == attributes
    end
  end
  assert_requested(:post, "#{EMAIL_ALERT_API_ENDPOINT}/messages", times: 1, &matcher)
end

def assert_subscribed(subscriber_list_id, address, frequency = "immediately")
  assert_requested(:post, "#{EMAIL_ALERT_API_ENDPOINT}/subscriptions") do |req|
    JSON.parse(req.body).symbolize_keys == {
      subscriber_list_id: subscriber_list_id,
      address: address,
      frequency: frequency,
    }
  end
end

def assert_unsubscribed(uuid)
  assert_requested(:post, "#{EMAIL_ALERT_API_ENDPOINT}/unsubscribe/#{uuid}", times: 1)
end

def build_subscriber_lists_url(attributes = nil)
  if attributes
    tags = attributes["tags"]
    links = attributes["links"]
    document_type = attributes["document_type"]
    email_document_supertype = attributes["email_document_supertype"]
    government_document_supertype = attributes["government_document_supertype"]
    content_purpose_supergroup = attributes["content_purpose_supergroup"]
    combine_mode = attributes["combine_mode"]
    params = {}
    params[:tags] = tags if tags
    params[:links] = links if links
    params[:document_type] = document_type if document_type
    params[:email_document_supertype] = email_document_supertype if email_document_supertype
    params[:government_document_supertype] = government_document_supertype if government_document_supertype
    params[:content_purpose_supergroup] = content_purpose_supergroup if content_purpose_supergroup
    params[:combine_mode] = combine_mode if combine_mode
    query = Rack::Utils.build_nested_query(params)
  end
  url = "#{EMAIL_ALERT_API_ENDPOINT}/subscriber-lists"
  query ? "#{url}?#{query}" : url
end

def get_latest_matching(params, subscriptions)
  matching = subscriptions.select do |_current_id, current_params|
    params[:subscriber_id] == current_params[:subscriber_id] &&
      params[:subscriber_list_id] == current_params[:subscriber_list_id]
  end
  matching.last
end

def get_subscriber_list_response(attributes)
  {
    "subscriber_list" => {
      "id" => "447135c3-07d6-4c3a-8a3b-efa49ef70e52",
      "title" => "Some title",
      "active_subscriptions_count" => 42,
    }.merge(attributes),
  }
end

def get_subscriber_response(id, address, govuk_account_id)
  {
    "subscriber" => {
      "id" => id,
      "address" => address,
      "govuk_account_id" => govuk_account_id,
    },
  }
end

def get_subscriber_subscriptions_response(id, address, subscriptions:)
  {
    "subscriber" => {
      "id" => id,
      "address" => address,
    },
    "subscriptions" => subscriptions || [
      {
        "subscriber_id" => 1,
        "subscriber_list_id" => 1000,
        "frequency" => "daily",
        "id" => "447135c3-07d6-4c3a-8a3b-efa49ef70e52",
        "subscriber_list" => {
          "id" => 1000,
          "slug" => "some-thing",
        },
      },
    ],
  }
end

def get_subscription_response(
  id,
  frequency: "daily",
  title: "Some title",
  subscriber_id: 1,
  subscriber_list_id: 1000,
  ended: false
)
  {
    "subscription" => {
      "id" => id,
      "frequency" => frequency,
      "source" => "user_signed_up",
      "ended_at" => ended ? Time.now.iso8601 : nil,
      "ended_reason" => ended ? "unsubscribed" : nil,
      "subscriber" => {
        "id" => subscriber_id,
        "address" => "test@example.com",
      },
      "subscriber_list" => {
        "id" => subscriber_list_id,
        "slug" => "some-thing",
        "title" => title,
      },
    },
  }
end

def post_alert_response
  {}
end

def stub_any_email_alert_api_call
  stub_request(:any, %r{\A#{EMAIL_ALERT_API_ENDPOINT}})
end

def stub_email_alert_api_accepts_content_change
  stub_request(:post, "#{EMAIL_ALERT_API_ENDPOINT}/content-changes")
    .to_return(status: 202, body: {}.to_json)
end

def stub_email_alert_api_accepts_email
  stub_request(:post, "#{EMAIL_ALERT_API_ENDPOINT}/emails")
    .to_return(status: 202, body: {}.to_json)
end

def stub_email_alert_api_accepts_message
  stub_request(:post, "#{EMAIL_ALERT_API_ENDPOINT}/messages")
    .to_return(status: 202, body: {}.to_json)
end

def stub_email_alert_api_authenticate_subscriber_by_govuk_account(govuk_account_session, subscriber_id, address, govuk_account_id: "user-id", new_govuk_account_session: nil)
  stub_request(:post, "#{EMAIL_ALERT_API_ENDPOINT}/subscribers/govuk-account")
    .with(
      body: { govuk_account_session: govuk_account_session }.to_json,
    ).to_return(
      status: 200,
      body: {
        govuk_account_session: new_govuk_account_session,
      }.compact.merge(get_subscriber_response(subscriber_id, address, govuk_account_id)).to_json,
    )
end

def stub_email_alert_api_authenticate_subscriber_by_govuk_account_email_unverified(govuk_account_session, new_govuk_account_session: nil)
  stub_request(:post, "#{EMAIL_ALERT_API_ENDPOINT}/subscribers/govuk-account")
    .with(
      body: { govuk_account_session: govuk_account_session }.to_json,
    ).to_return(
      status: 403,
      body: {
        govuk_account_session: new_govuk_account_session,
      }.compact.to_json,
    )
end

def stub_email_alert_api_authenticate_subscriber_by_govuk_account_no_subscriber(govuk_account_session, new_govuk_account_session: nil)
  stub_request(:post, "#{EMAIL_ALERT_API_ENDPOINT}/subscribers/govuk-account")
    .with(
      body: { govuk_account_session: govuk_account_session }.to_json,
    ).to_return(
      status: 404,
      body: {
        govuk_account_session: new_govuk_account_session,
      }.compact.to_json,
    )
end

def stub_email_alert_api_authenticate_subscriber_by_govuk_account_session_invalid(govuk_account_session)
  stub_request(:post, "#{EMAIL_ALERT_API_ENDPOINT}/subscribers/govuk-account")
    .with(
      body: { govuk_account_session: govuk_account_session }.to_json,
    ).to_return(
      status: 401,
    )
end

def stub_email_alert_api_creates_a_subscription(
  subscriber_list_id: nil,
  address: nil,
  frequency: nil,
  returned_subscription_id: nil,
  skip_confirmation_email: false,
  subscriber_id: nil
)
  response = get_subscription_response(
    returned_subscription_id,
    frequency: frequency,
    subscriber_list_id: subscriber_list_id,
    subscriber_id: subscriber_id,
  )
  request_params = {
    subscriber_list_id: subscriber_list_id,
    address: address,
    frequency: frequency,
    skip_confirmation_email: skip_confirmation_email,
  }
  stub_request(:post, "#{EMAIL_ALERT_API_ENDPOINT}/subscriptions")
    .with(body: hash_including(request_params.compact))
    .to_return(status: 200, body: response.to_json)
end

def stub_email_alert_api_creates_subscriber_list(attributes)
  stub_request(:post, build_subscriber_lists_url)
    .to_return(
      status: 201,
      body: get_subscriber_list_response(attributes).to_json,
    )
end

def stub_email_alert_api_does_not_have_subscriber_list(attributes)
  stub_request(:get, build_subscriber_lists_url(attributes))
    .to_return(status: 404)
end

def stub_email_alert_api_does_not_have_subscriber_list_by_slug(slug:)
  stub_request(:get, "#{EMAIL_ALERT_API_ENDPOINT}/subscriber-lists/#{slug}")
    .to_return(status: 404)
end

def stub_email_alert_api_does_not_have_subscriber_subscriptions(id)
  stub_request(:get, "#{EMAIL_ALERT_API_ENDPOINT}/subscribers/#{id}/subscriptions")
    .to_return(status: 404)
end

def stub_email_alert_api_does_not_have_updated_subscriber(id)
  stub_request(:patch, "#{EMAIL_ALERT_API_ENDPOINT}/subscribers/#{id}")
    .to_return(status: 404)
end

def stub_email_alert_api_does_not_have_updated_subscription(subscription_id)
  stub_request(:patch, "#{EMAIL_ALERT_API_ENDPOINT}/subscriptions/#{subscription_id}")
    .to_return(status: 404)
end

def stub_email_alert_api_find_subscriber_by_govuk_account(govuk_account_id, subscriber_id, address)
  stub_request(:get, "#{EMAIL_ALERT_API_ENDPOINT}/subscribers/govuk-account/#{govuk_account_id}")
    .to_return(
      status: 200,
      body: get_subscriber_response(subscriber_id, address, govuk_account_id).to_json,
    )
end

def stub_email_alert_api_find_subscriber_by_govuk_account_no_subscriber(govuk_account_id)
  stub_request(:get, "#{EMAIL_ALERT_API_ENDPOINT}/subscribers/govuk-account/#{govuk_account_id}")
    .to_return(status: 404)
end

def stub_email_alert_api_has_no_subscriber(subscriber_id)
  stub_request(:delete, "#{EMAIL_ALERT_API_ENDPOINT}/subscribers/#{subscriber_id}")
    .to_return(status: 404)
end

def stub_email_alert_api_has_no_subscription_for_uuid(uuid)
  stub_request(:post, "#{EMAIL_ALERT_API_ENDPOINT}/unsubscribe/#{uuid}")
    .with(body: "{}")
    .to_return(status: 404)
end

def stub_email_alert_api_has_subscriber_list(attributes)
  stub_request(:get, build_subscriber_lists_url(attributes))
    .to_return(
      status: 200,
      body: get_subscriber_list_response(attributes).to_json,
    )
end

def stub_email_alert_api_has_subscriber_list_by_slug(slug:, returned_attributes:)
  stub_request(:get, "#{EMAIL_ALERT_API_ENDPOINT}/subscriber-lists/#{slug}")
    .to_return(
      status: 200,
      body: {
        subscriber_list: returned_attributes,
      }.to_json,
    )
end

def stub_email_alert_api_has_subscriber_subscriptions(id, address, order = nil, subscriptions: nil)
  params = order ? "?order=#{order}" : ""
  stub_request(:get, "#{EMAIL_ALERT_API_ENDPOINT}/subscribers/#{id}/subscriptions#{params}")
    .to_return(
      status: 200,
      body: get_subscriber_subscriptions_response(id, address, subscriptions: subscriptions).to_json,
    )
end

def stub_email_alert_api_has_subscription(
  id,
  frequency,
  title: "Some title",
  subscriber_id: 1,
  subscriber_list_id: 1000,
  ended: false
)
  response = get_subscription_response(
    id,
    frequency: frequency,
    title: title,
    subscriber_id: subscriber_id,
    subscriber_list_id: subscriber_list_id,
    ended: ended,
  ).to_json
  stub_request(:get, "#{EMAIL_ALERT_API_ENDPOINT}/subscriptions/#{id}")
    .to_return(status: 200, body: response)
  stub_request(:get, "#{EMAIL_ALERT_API_ENDPOINT}/subscriptions/#{id}/latest")
    .to_return(status: 200, body: response)
end

def stub_email_alert_api_has_subscriptions(subscriptions)
  subscriptions.map! { |subscription| apply_subscription_defaults(subscription) }
  subscriptions.each do |id, params|
    latest_id, latest_params = get_latest_matching(params, subscriptions)
    stub_request(:get, "#{EMAIL_ALERT_API_ENDPOINT}/subscriptions/#{id}")
      .to_return(status: 200, body: get_subscription_response(id, **params).to_json)
    stub_request(:get, "#{EMAIL_ALERT_API_ENDPOINT}/subscriptions/#{id}/latest")
      .to_return(status: 200, body: get_subscription_response(latest_id, **latest_params).to_json)
  end
end

def stub_email_alert_api_has_updated_subscriber(id, new_address, govuk_account_id: nil)
  stub_request(:patch, "#{EMAIL_ALERT_API_ENDPOINT}/subscribers/#{id}")
    .to_return(
      status: 200,
      body: get_subscriber_response(id, new_address, govuk_account_id).to_json,
    )
end

def stub_email_alert_api_has_updated_subscription(subscription_id, frequency)
  stub_request(:patch, "#{EMAIL_ALERT_API_ENDPOINT}/subscriptions/#{subscription_id}")
    .to_return(
      status: 200,
      body: get_subscription_response(subscription_id, frequency: frequency).to_json,
    )
end

def stub_email_alert_api_invalid_update_subscriber(id)
  stub_request(:patch, "#{EMAIL_ALERT_API_ENDPOINT}/subscribers/#{id}")
    .to_return(status: 422)
end

def stub_email_alert_api_link_subscriber_to_govuk_account(govuk_account_session, subscriber_id, address, govuk_account_id: "user-id", new_govuk_account_session: nil)
  stub_request(:post, "#{EMAIL_ALERT_API_ENDPOINT}/subscribers/govuk-account/link")
    .with(
      body: { govuk_account_session: govuk_account_session }.to_json,
    ).to_return(
      status: 200,
      body: {
        govuk_account_session: new_govuk_account_session,
      }.compact.merge(get_subscriber_response(subscriber_id, address, govuk_account_id)).to_json,
    )
end

def stub_email_alert_api_link_subscriber_to_govuk_account_email_unverified(govuk_account_session, new_govuk_account_session: nil)
  stub_request(:post, "#{EMAIL_ALERT_API_ENDPOINT}/subscribers/govuk-account/link")
    .with(
      body: { govuk_account_session: govuk_account_session }.to_json,
    ).to_return(
      status: 403,
      body: {
        govuk_account_session: new_govuk_account_session,
      }.compact.to_json,
    )
end

def stub_email_alert_api_link_subscriber_to_govuk_account_session_invalid(govuk_account_session)
  stub_request(:post, "#{EMAIL_ALERT_API_ENDPOINT}/subscribers/govuk-account/link")
    .with(
      body: { govuk_account_session: govuk_account_session }.to_json,
    ).to_return(
      status: 401,
    )
end

def stub_email_alert_api_refuses_to_create_subscriber_list
  stub_request(:post, build_subscriber_lists_url)
    .to_return(status: 422)
end

def stub_email_alert_api_refuses_to_create_subscription(subscriber_list_id, address, frequency)
  stub_request(:post, "#{EMAIL_ALERT_API_ENDPOINT}/subscriptions")
    .with(
      body: hash_including(
        subscriber_list_id: subscriber_list_id,
        address: address,
        frequency: frequency,
      ),
    ).to_return(status: 422)
end

def stub_email_alert_api_sends_subscriber_verification_email(subscriber_id, address, govuk_account_id: nil)
  stub_request(:post, "#{EMAIL_ALERT_API_ENDPOINT}/subscribers/auth-token")
    .to_return(
      status: 201,
      body: get_subscriber_response(subscriber_id, address, govuk_account_id).to_json,
    )
end

def stub_email_alert_api_sends_subscription_verification_email(address, frequency, topic_id)
  stub_request(:post, "#{EMAIL_ALERT_API_ENDPOINT}/subscriptions/auth-token")
    .with(
      body: { address: address, frequency: frequency, topic_id: topic_id }.to_json,
    ).to_return(status: 200)
end

def stub_email_alert_api_subscriber_verification_email_invalid
  stub_request(:post, "#{EMAIL_ALERT_API_ENDPOINT}/subscribers/auth-token")
    .to_return(status: 422)
end

def stub_email_alert_api_subscriber_verification_email_no_subscriber
  stub_request(:post, "#{EMAIL_ALERT_API_ENDPOINT}/subscribers/auth-token")
    .to_return(status: 404)
end

def stub_email_alert_api_subscription_verification_email_invalid(address, frequency, topic_id)
  stub_request(:post, "#{EMAIL_ALERT_API_ENDPOINT}/subscriptions/auth-token")
    .with(
      body: { address: address, frequency: frequency, topic_id: topic_id }.to_json,
    ).to_return(status: 422)
end

def stub_email_alert_api_unsubscribes_a_subscriber(subscriber_id)
  stub_request(:delete, "#{EMAIL_ALERT_API_ENDPOINT}/subscribers/#{subscriber_id}")
    .to_return(status: 204)
end

def stub_email_alert_api_unsubscribes_a_subscription(uuid)
  stub_request(:post, "#{EMAIL_ALERT_API_ENDPOINT}/unsubscribe/#{uuid}")
    .with(body: "{}")
    .to_return(status: 204)
end