# GOV.UK Mini Environment Admin
# Copyright © 2018  Christopher Baines <mail@cbaines.net>
#
# This file is part of the GOV.UK Mini Environment Admin.
#
# The GOV.UK Mini Environment Admin is free software: you can
# redistribute it and/or modify it under the terms of the GNU Affero
# General Public License as published by the Free Software Foundation,
# either version 3 of the License, or (at your option) any later
# version.
#
# The GOV.UK Mini Environment Admin is distributed in the hope that it
# will be useful, but WITHOUT ANY WARRANTY; without even the implied
# warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
# See the GNU Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public
# License along with the GOV.UK Mini Environment Admin.  If not, see
# <http://www.gnu.org/licenses/>.

class TerraformHttpBackendController < ApplicationController
  # These controller methods are for use by Terraform
  TERRAFORM_CONTROLLER_METHODS = %w(create show destroy)

  skip_before_action :verify_authenticity_token, only: TERRAFORM_CONTROLLER_METHODS
  skip_before_action :authenticate_user!, only: TERRAFORM_CONTROLLER_METHODS

  def self.credentials
    @_credentials ||= begin
      # Hopefully there is a simpler way of doing this, but it'll do
      # for now.
      verifier = ActiveSupport::MessageVerifier.new(
        Rails.application.secrets[:secret_key_base]
      )

      {
        name: 'terraform',
        password: verifier.generate('tpw')
      }
    end
  end

  http_basic_authenticate_with(
    **credentials,
    only: TERRAFORM_CONTROLLER_METHODS
  )

  def index
    @all_states = TerraformState.all.group_by(&:state_id)
  end

  def create
    TerraformState.create(
      state_id: state_id,
      data: params[:terraform_http_backend]
    )

    render json: '{ "success": true }', status: 200
  end

  def show
    @state = TerraformState.where(
      state_id: state_id
    ).order(:id).last

    if @state.nil?
      render json: '{}', status: 404
    else
      render json: @state.data, status: 200
    end
  end

  def show_history
    @state = TerraformState.where(
      state_id: state_id
    ).order(:id).last

    respond_to do |format|
      format.html do
        render :show
      end
      format.json do
        if @state.nil?
          render json: '{}', status: 404
        else
          render json: @state.data, status: 200
        end
      end
    end
  end

  def show_by_index
    @state = TerraformState.where(
      state_id: state_id
    ).order(:id).to_a[params[:index].to_i]

    respond_to do |format|
      format.html do
        render :show
      end
      format.json do
        if @state.nil?
          render json: '{}', status: 404
        else
          render json: @state.data, status: 200
        end
      end
    end
  end

  def destroy
    TerraformState
      .where(state_id: state_id)
      .delete_all

    render json: '{ "success": true }', status: 200
  end

  def state_id
    params[:state_id]
  end
end