class IssuesController < ApplicationController
  before_filter :authenticate_user!
  before_filter :project
  before_filter :module_enabled
  before_filter :issue, only: [:edit, :update, :destroy, :show]
  helper_method :issues_filter

  layout "project"

  # Authorize
  before_filter :add_project_abilities

  # Allow read any issue
  before_filter :authorize_read_issue!

  # Allow write(create) issue
  before_filter :authorize_write_issue!, only: [:new, :create]

  # Allow modify issue
  before_filter :authorize_modify_issue!, only: [:close, :edit, :update]

  # Allow destroy issue
  before_filter :authorize_admin_issue!, only: [:destroy]

  respond_to :js, :html

  def index
    @issues = issues_filtered

    @issues = @issues.page(params[:page]).per(20)

    respond_to do |format|
      format.html # index.html.erb
      format.js
      format.atom { render layout: false }
    end
  end

  def new
    @issue = @project.issues.new
    @issue.milestone_id = params[:milestone_id] if params[:milestone_id].present?
    @issue.assignee_id = params[:assignee_id] if params[:assignee_id].present?
    respond_with(@issue)
  end

  def edit
    respond_with(@issue)
  end

  def show
    @note = @project.notes.new(noteable: @issue)

    respond_to do |format|
      format.html
      format.js
    end
  end

  def create
    @issue = @project.issues.new(params[:issue])
    @issue.author = current_user
    @issue.save

    respond_to do |format|
      format.html do
        if @issue.valid? 
          redirect_to project_issue_path(@project, @issue)
        else
          render :new
        end
      end
      format.js
    end
  end

  def update
    @issue.update_attributes(params[:issue].merge(author_id_of_changes: current_user.id))

    respond_to do |format|
      format.js
      format.html do 
        if @issue.valid?
          redirect_to [@project, @issue]
        else
          render :edit
        end
      end
    end
  end

  def destroy
    return access_denied! unless can?(current_user, :admin_issue, @issue)

    @issue.destroy

    respond_to do |format|
      format.html { redirect_to project_issues_path }
      format.js { render nothing: true }
    end
  end

  def sort
    return render_404 unless can?(current_user, :admin_issue, @project)

    @issues = @project.issues.where(id: params['issue'])
    @issues.each do |issue|
      issue.position = params['issue'].index(issue.id.to_s) + 1
      issue.save
    end

    render nothing: true
  end

  def search
    terms = params['terms']

    @issues = issues_filtered
    @issues = @issues.where("title LIKE ?", "%#{terms}%") unless terms.blank?
    @issues = @issues.page(params[:page]).per(100)

    render partial: 'issues'
  end

  def bulk_update
    result = IssuesBulkUpdateContext.new(project, current_user, params).execute
    redirect_to :back, notice: "#{result[:count]} issues updated"
  end

  protected

  def issue
    @issue ||= @project.issues.find(params[:id])
  end

  def authorize_modify_issue!
    return render_404 unless can?(current_user, :modify_issue, @issue)
  end

  def authorize_admin_issue!
    return render_404 unless can?(current_user, :admin_issue, @issue)
  end

  def module_enabled
    return render_404 unless @project.issues_enabled
  end

  def issues_filtered
    @issues = case params[:f]
              when issues_filter[:all] then @project.issues
              when issues_filter[:closed] then @project.issues.closed
              when issues_filter[:to_me] then @project.issues.opened.assigned(current_user)
              else @project.issues.opened
              end

    @issues = @issues.tagged_with(params[:label_name]) if params[:label_name].present?
    @issues = @issues.includes(:author, :project).order("updated_at")

    # Filter by specific assignee_id (or lack thereof)?
    if params[:assignee_id].present?
      @issues = @issues.where(assignee_id: (params[:assignee_id] == '0' ? nil : params[:assignee_id]))
    end

    # Filter by specific milestone_id (or lack thereof)?
    if params[:milestone_id].present?
      @issues = @issues.where(milestone_id: (params[:milestone_id] == '0' ? nil : params[:milestone_id]))
    end

    @issues
  end

  def issues_filter
    {
      all: "all",
      closed: "closed",
      to_me: "assigned-to-me",
      open: "open" 
    }
  end
end