#-- copyright
# OpenProject is an open source project management software.
# Copyright (C) 2012-2020 the OpenProject GmbH
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License version 3.
#
# OpenProject is a fork of ChiliProject, which is a fork of Redmine. The copyright follows:
# Copyright (C) 2006-2017 Jean-Philippe Lang
# Copyright (C) 2010-2013 the ChiliProject Team
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
#
# See docs/COPYRIGHT.rdoc for more details.
#++

class BudgetsController < ApplicationController
  before_action :find_budget, only: %i[show edit update copy]
  before_action :find_budgets, only: :destroy
  before_action :find_project, only: %i[new create update_material_budget_item update_labor_budget_item]
  before_action :find_optional_project, only: :index

  before_action :authorize_global, only: :index
  before_action :authorize, except: [
    # unrestricted actions
    :index,
    :update_material_budget_item,
    :update_labor_budget_item
  ]

  helper :sort
  include SortHelper
  helper :projects
  include ProjectsHelper
  helper :attachments
  include AttachmentsHelper
  helper :costlog
  include CostlogHelper
  helper :budgets
  include BudgetsHelper
  include PaginationHelper

  def index
    sort_init 'id', 'desc'
    sort_update default_budget_sort

    @budgets = visible_sorted_budgets

    respond_to do |format|
      format.html do
        render action: 'index', layout: !request.xhr?
      end
      format.csv { send_data(budgets_to_csv(@budgets), type: 'text/csv; header=present', filename: 'export.csv') }
    end
  end

  def show
    @edit_allowed = User.current.allowed_to?(:edit_budgets, @project)
    respond_to do |format|
      format.html { render action: 'show', layout: !request.xhr? }
    end
  end

  def new
    @budget ||= Budget.new
    @budget.project_id = @project.id
    @budget.fixed_date ||= Date.today

    render layout: !request.xhr?
  end

  def copy
    source = Budget.find(params[:id].to_i)
    @budget = Budget.new

    if source
      @budget.copy_from(source)
    end

    @budget.fixed_date ||= Date.today

    render action: :new, layout: !request.xhr?
  end

  def create
    @budget = Budget.new
    @budget.project_id = @project.id

    # fixed_date must be set before material_budget_items and labor_budget_items
    @budget.fixed_date = if params[:budget] && params[:budget][:fixed_date]
                           params[:budget].delete(:fixed_date)
                         else
                           Date.today
                         end

    @budget.attributes = permitted_params.budget
    @budget.attach_files(permitted_params.attachments.to_h)

    if @budget.save
      flash[:notice] = t(:notice_successful_create)
      redirect_to(params[:continue] ? { action: 'new' } : { action: 'show', id: @budget })
    else
      render action: 'new', layout: !request.xhr?
    end
  end

  def edit
    @budget.attributes = permitted_params.budget if params[:budget]
  end

  def update
    # TODO: This was simply copied over from edit in order to have
    # something as a starting point for separating the two
    # Please go ahead and start removing code where necessary

    @budget.attributes = permitted_params.budget if params[:budget]
    if params[:budget][:existing_material_budget_item_attributes].nil?
      @budget.existing_material_budget_item_attributes = ({})
    end
    if params[:budget][:existing_labor_budget_item_attributes].nil?
      @budget.existing_labor_budget_item_attributes = ({})
    end

    @budget.attach_files(permitted_params.attachments.to_h)

    if @budget.save
      flash[:notice] = t(:notice_successful_update)
      redirect_to(params[:back_to] || { action: 'show', id: @budget })
    else
      render action: 'edit'
    end
  rescue ActiveRecord::StaleObjectError
    # Optimistic locking exception
    flash.now[:error] = t(:notice_locking_conflict)
  end

  def destroy
    @budgets.each(&:destroy)
    flash[:notice] = t(:notice_successful_delete)
    redirect_to action: 'index', project_id: @project
  end

  def update_material_budget_item
    @element_id = params[:element_id]

    cost_type = CostType.where(id: params[:cost_type_id]).first

    if cost_type && params[:units].present?
      volume = Rate.parse_number_string_to_number(params[:units])
      @costs = volume * cost_type.rate_at(params[:fixed_date]).rate rescue 0.0
      @unit = volume == 1.0 ? cost_type.unit : cost_type.unit_plural
    else
      @costs = 0.0
      @unit = cost_type.try(:unit_plural) || ''
    end

    respond_to do |format|
      format.json do
        render json: render_item_as_json(@element_id, @costs, @unit, @project, :view_cost_rates)
      end
    end
  end

  def update_labor_budget_item
    @element_id = params[:element_id]
    user = User.where(id: params[:user_id]).first

    if user && params[:hours]
      hours = params[:hours].to_s.to_hours
      @costs = hours * user.rate_at(params[:fixed_date], @project).rate rescue 0.0
    else
      @costs = 0.0
    end

    respond_to do |format|
      format.json do
        render json: render_item_as_json(@element_id, @costs, @unit, @project, :view_hourly_rates)
      end
    end
  end

  private

  def find_budget
    # This function comes directly from issues_controller.rb (Redmine 0.8.4)
    @budget = Budget.includes(:project, :author).find_by(id: params[:id])
    @project = @budget.project if @budget
  rescue ActiveRecord::RecordNotFound
    render_404
  end

  def find_budgets
    # This function comes directly from issues_controller.rb (Redmine 0.8.4)

    @budgets = Budget.where(id: params[:id] || params[:ids])
    raise ActiveRecord::RecordNotFound if @budgets.empty?

    projects = @budgets.map(&:project).compact.uniq
    if projects.size == 1
      @project = projects.first
    else
      # TODO: let users bulk edit/move/destroy budgets from different projects
      render_error 'Can not bulk edit/move/destroy cost objects from different projects' and return false
    end
  rescue ActiveRecord::RecordNotFound
    render_404
  end

  def find_project
    @project = Project.find(params[:project_id])
  rescue ActiveRecord::RecordNotFound
    render_404
  end

  def find_optional_project
    @project = Project.find(params[:project_id]) unless params[:project_id].blank?
  rescue ActiveRecord::RecordNotFound
    render_404
  end

  def render_item_as_json(element_id, costs, unit, project, permission)
    response = {
      "#{element_id}_unit_name" => ActionController::Base.helpers.sanitize(unit),
      "#{element_id}_currency" => Setting.plugin_costs['costs_currency']
    }

    if current_user.allowed_to?(permission, project)
      response["#{element_id}_costs"] = number_to_currency(costs)
      response["#{element_id}_cost_value"] = costs
    end

    response
  end

  def default_budget_sort
    {
      'id' => "#{Budget.table_name}.id",
      'subject' => "#{Budget.table_name}.subject",
      'fixed_date' => "#{Budget.table_name}.fixed_date"
    }
  end

  def visible_sorted_budgets
    Budget
      .visible(current_user)
      .order(sort_clause)
      .includes(:author)
      .where(project_id: @project.id)
      .page(page_param)
      .per_page(per_page_param)
  end
end