module API
  # Projects API
  class Projects < Grape::API
    before { authenticate! }

    resource :projects do
      helpers do
        def handle_project_member_errors(errors)
          if errors[:project_access].any?
            error!(errors[:project_access], 422)
          end
          not_found!
        end

        def map_public_to_visibility_level(attrs)
          publik = attrs.delete(:public)
          publik = [ true, 1, '1', 't', 'T', 'true', 'TRUE', 'on', 'ON' ].include?(publik)
          attrs[:visibility_level] = Gitlab::VisibilityLevel::PUBLIC if !attrs[:visibility_level].present? && publik == true
          attrs
        end
      end

      # Get a projects list for authenticated user
      #
      # Example Request:
      #   GET /projects
      get do
        @projects = paginate current_user.authorized_projects
        present @projects, with: Entities::Project
      end

      # Get an owned projects list for authenticated user
      #
      # Example Request:
      #   GET /projects/owned
      get '/owned' do
        @projects = paginate current_user.owned_projects
        present @projects, with: Entities::Project
      end

      # Get all projects for admin user
      #
      # Example Request:
      #   GET /projects/all
      get '/all' do
        authenticated_as_admin!
        @projects = paginate Project
        present @projects, with: Entities::Project
      end

      # Get a single project
      #
      # Parameters:
      #   id (required) - The ID of a project
      # Example Request:
      #   GET /projects/:id
      get ":id" do
        present user_project, with: Entities::Project
      end

      # Get a single project events
      #
      # Parameters:
      #   id (required) - The ID of a project
      # Example Request:
      #   GET /projects/:id
      get ":id/events" do
        limit = (params[:per_page] || 20).to_i
        offset = (params[:page] || 0).to_i * limit
        events = user_project.events.recent.limit(limit).offset(offset)

        present events, with: Entities::Event
      end

      # Create new project
      #
      # Parameters:
      #   name (required) - name for new project
      #   description (optional) - short project description
      #   issues_enabled (optional)
      #   wall_enabled (optional)
      #   merge_requests_enabled (optional)
      #   wiki_enabled (optional)
      #   snippets_enabled (optional)
      #   namespace_id (optional) - defaults to user namespace
      #   public (optional) - if true same as setting visibility_level = 20
      #   visibility_level (optional) - 0 by default
      # Example Request
      #   POST /projects
      post do
        required_attributes! [:name]
        attrs = attributes_for_keys [:name,
                                     :path,
                                     :description,
                                     :issues_enabled,
                                     :wall_enabled,
                                     :merge_requests_enabled,
                                     :wiki_enabled,
                                     :snippets_enabled,
                                     :namespace_id,
                                     :public,
                                     :visibility_level,
                                     :import_url]
        attrs = map_public_to_visibility_level(attrs)
        @project = ::Projects::CreateService.new(current_user, attrs).execute
        if @project.saved?
          present @project, with: Entities::Project
        else
          if @project.errors[:limit_reached].present?
            error!(@project.errors[:limit_reached], 403)
          end
          not_found!
        end
      end

      # Create new project for a specified user.  Only available to admin users.
      #
      # Parameters:
      #   user_id (required) - The ID of a user
      #   name (required) - name for new project
      #   description (optional) - short project description
      #   default_branch (optional) - 'master' by default
      #   issues_enabled (optional)
      #   wall_enabled (optional)
      #   merge_requests_enabled (optional)
      #   wiki_enabled (optional)
      #   snippets_enabled (optional)
      #   public (optional) - if true same as setting visibility_level = 20
      #   visibility_level (optional)
      # Example Request
      #   POST /projects/user/:user_id
      post "user/:user_id" do
        authenticated_as_admin!
        user = User.find(params[:user_id])
        attrs = attributes_for_keys [:name,
                                     :description,
                                     :default_branch,
                                     :issues_enabled,
                                     :wall_enabled,
                                     :merge_requests_enabled,
                                     :wiki_enabled,
                                     :snippets_enabled,
                                     :public,
                                     :visibility_level]
        attrs = map_public_to_visibility_level(attrs)
        @project = ::Projects::CreateService.new(user, attrs).execute
        if @project.saved?
          present @project, with: Entities::Project
        else
          not_found!
        end
      end

      # Remove project
      #
      # Parameters:
      #   id (required) - The ID of a project
      # Example Request:
      #   DELETE /projects/:id
      delete ":id" do
        authorize! :remove_project, user_project
        user_project.destroy
      end

      # Mark this project as forked from another
      #
      # Parameters:
      #   id: (required) - The ID of the project being marked as a fork
      #   forked_from_id: (required) - The ID of the project it was forked from
      # Example Request:
      #   POST /projects/:id/fork/:forked_from_id
      post ":id/fork/:forked_from_id" do
        authenticated_as_admin!
        forked_from_project = find_project(params[:forked_from_id])
        unless forked_from_project.nil?
          if user_project.forked_from_project.nil?
            user_project.create_forked_project_link(forked_to_project_id: user_project.id, forked_from_project_id: forked_from_project.id)
          else
            render_api_error!("Project already forked", 409)
          end
        else
          not_found!
        end

      end

      # Remove a forked_from relationship
      #
      # Parameters:
      # id: (required) - The ID of the project being marked as a fork
      # Example Request:
      #  DELETE /projects/:id/fork
      delete ":id/fork" do
        authenticated_as_admin!
        unless user_project.forked_project_link.nil?
          user_project.forked_project_link.destroy
        end
      end

      # Get a project team members
      #
      # Parameters:
      #   id (required) - The ID of a project
      #   query         - Query string
      # Example Request:
      #   GET /projects/:id/members
      get ":id/members" do
        if params[:query].present?
          @members = paginate user_project.users.where("username LIKE ?", "%#{params[:query]}%")
        else
          @members = paginate user_project.users
        end
        present @members, with: Entities::ProjectMember, project: user_project
      end

      # Get a project team members
      #
      # Parameters:
      #   id (required) - The ID of a project
      #   user_id (required) - The ID of a user
      # Example Request:
      #   GET /projects/:id/members/:user_id
      get ":id/members/:user_id" do
        @member = user_project.users.find params[:user_id]
        present @member, with: Entities::ProjectMember, project: user_project
      end

      # Add a new project team member
      #
      # Parameters:
      #   id (required) - The ID of a project
      #   user_id (required) - The ID of a user
      #   access_level (required) - Project access level
      # Example Request:
      #   POST /projects/:id/members
      post ":id/members" do
        authorize! :admin_project, user_project
        required_attributes! [:user_id, :access_level]

        # either the user is already a team member or a new one
        team_member = user_project.team_member_by_id(params[:user_id])
        if team_member.nil?
          team_member = user_project.users_projects.new(
            user_id: params[:user_id],
            project_access: params[:access_level]
          )
        end

        if team_member.save
          @member = team_member.user
          present @member, with: Entities::ProjectMember, project: user_project
        else
          handle_project_member_errors team_member.errors
        end
      end

      # Update project team member
      #
      # Parameters:
      #   id (required) - The ID of a project
      #   user_id (required) - The ID of a team member
      #   access_level (required) - Project access level
      # Example Request:
      #   PUT /projects/:id/members/:user_id
      put ":id/members/:user_id" do
        authorize! :admin_project, user_project
        required_attributes! [:access_level]

        team_member = user_project.users_projects.find_by(user_id: params[:user_id])
        not_found!("User can not be found") if team_member.nil?

        if team_member.update_attributes(project_access: params[:access_level])
          @member = team_member.user
          present @member, with: Entities::ProjectMember, project: user_project
        else
          handle_project_member_errors team_member.errors
        end
      end

      # Remove a team member from project
      #
      # Parameters:
      #   id (required) - The ID of a project
      #   user_id (required) - The ID of a team member
      # Example Request:
      #   DELETE /projects/:id/members/:user_id
      delete ":id/members/:user_id" do
        authorize! :admin_project, user_project
        team_member = user_project.users_projects.find_by(user_id: params[:user_id])
        unless team_member.nil?
          team_member.destroy
        else
          {message: "Access revoked", id: params[:user_id].to_i}
        end
      end

      # search for projects current_user has access to
      #
      # Parameters:
      #   query (required) - A string contained in the project name
      #   per_page (optional) - number of projects to return per page
      #   page (optional) - the page to retrieve
      # Example Request:
      #   GET /projects/search/:query
      get "/search/:query" do
        ids = current_user.authorized_projects.map(&:id)
        visibility_levels = [ Gitlab::VisibilityLevel::INTERNAL, Gitlab::VisibilityLevel::PUBLIC ]
        projects = Project.where("(id in (?) OR visibility_level in (?)) AND (name LIKE (?))", ids, visibility_levels, "%#{params[:query]}%")
        present paginate(projects), with: Entities::Project
      end


      # Get a users list
      #
      # Example Request:
      #  GET /users
      get ':id/users' do
        @users = User.where(id: user_project.team.users.map(&:id))
        @users = @users.search(params[:search]) if params[:search].present?
        @users = paginate @users
        present @users, with: Entities::User
      end
    end
  end
end