class ReportsController < ApplicationController
  include TeamsHelper
  include ReportActions
  include ReportsHelper

  BEFORE_ACTION_METHODS = %i(
    create
    edit
    update
    generate_pdf
    generate_docx
    save_modal
    new_template_values
    project_contents
    experiment_contents_modal
    module_contents_modal
    step_contents_modal
    result_contents_modal
    experiment_contents
    module_contents
    step_contents
    result_contents
  ).freeze

  before_action :load_vars, only: %i(edit update document_preview generate_pdf generate_docx status
                                     save_pdf_to_inventory_modal save_pdf_to_inventory_item)
  before_action :load_vars_nested, only: BEFORE_ACTION_METHODS
  before_action :load_visible_projects, only: %i(new edit)
  before_action :load_available_repositories, only: %i(index save_pdf_to_inventory_modal available_repositories)

  before_action :check_manage_permissions, only: BEFORE_ACTION_METHODS
  before_action :switch_team_with_param, only: :index

  after_action :generate_pdf_report, only: %i(create update)

  # Index showing all reports of a single project
  def index; end

  def datatable
    respond_to do |format|
      format.json do
        render json: ::ReportDatatable.new(
          view_context,
          current_user,
          Report.viewable_by_user(current_user, current_team)
        )
      end
    end
  end

  # Report grouped by modules
  def new
    @templates = Extends::REPORT_TEMPLATES
    @repositories = Repository.accessible_by_teams(current_team).active.select(:id, :name)
    @report = current_team.reports.new
  end

  def new_template_values
    template = Extends::REPORT_TEMPLATES[params[:template].to_sym]
    return render_404 if template.blank?

    report = current_team.reports.where(project: @project).find_by(id: params[:report_id])
    report ||= current_team.reports.new(project: @project)

    respond_to do |format|
      format.json do
        if lookup_context.template_exists?("reports/templates/#{template}/edit.html.erb")
          render json: {
            html: render_to_string(
              template: "reports/templates/#{template}/edit.html.erb",
              layout: 'reports/template_values_editor',
              locals: { report: report }
            )
          }
        else
          render json: {
            html: render_to_string(partial: 'reports/wizard/no_template_values.html.erb')
          }
        end
      end
    end
  end

  # Creating new report from the _save modal of the new page
  def create
    @report = Report.new(report_params)
    @report.project = @project
    @report.user = current_user
    @report.team = current_team
    @report.pdf_file_processing = true
    @report.settings = report_params[:settings]
    @report.last_modified_by = current_user

    ReportActions::ReportContent.new(
      @report,
      params[:project_content],
      params[:template_values],
      current_user
    ).save_with_content

    if @report.errors.blank?
      log_activity(:create_report)

      redirect_to reports_path
    else
      render json: @report.errors.full_messages, status: :unprocessable_entity
    end
  end

  def edit
    @edit = true
    @templates = Extends::REPORT_TEMPLATES
    @repositories = Repository.accessible_by_teams(current_team).active.select(:id, :name)
    @report.settings = Report::DEFAULT_SETTINGS if @report.settings.blank?

    @project_contents = {
      experiments: @report.report_elements.experiment.pluck(:experiment_id),
      my_modules: @report.report_elements.my_module.pluck(:my_module_id),
      repositories: @report.report_elements.my_module_repository.distinct(:repository_id).pluck(:repository_id)
    }
    render :new
  end

  # Updating existing report from the _save modal of the new page
  def update
    @report.last_modified_by = current_user
    @report.pdf_file_processing = true
    @report.assign_attributes(report_params)

    ReportActions::ReportContent.new(
      @report,
      params[:project_content],
      params[:template_values],
      current_user
    ).save_with_content

    if @report.errors.blank?
      log_activity(:edit_report)

      redirect_to reports_path
    else
      render json: @report.errors.full_messages, status: :unprocessable_entity
    end
  end

  # Destroy multiple entries action
  def destroy
    begin
      report_ids = JSON.parse(params[:report_ids])
    rescue
      render_404
    end

    report_ids.each do |report_id|
      report = Report.find_by_id(report_id)
      next unless report.present? && can_manage_reports?(report.project.team)

      # record an activity
      log_activity(:delete_report, report)
      report.destroy
    end

    redirect_to reports_path
  end

  def status
    docx = @report.docx_file.attached? ? document_preview_report_path(@report, report_type: :docx) : nil
    pdf = @report.pdf_file.attached? ? document_preview_report_path(@report, report_type: :pdf) : nil

    respond_to do |format|
      format.json do
        render json: {
          docx: {
            processing: @report.docx_file_processing,
            preview_url: docx,
            error: false
          },
          pdf: {
            processing: @report.pdf_file_processing,
            preview_url: pdf,
            error: false
          }
        }
      end
    end
  end

  # Generation actions
  def generate_pdf
    respond_to do |format|
      format.json do
        @report.update!(pdf_file_processing: true)
        log_activity(:generate_pdf_report)
        Reports::PdfJob.perform_later(@report, current_user)
        render json: {
          message: I18n.t('projects.reports.index.generation.accepted_message')
        }
      end
    end
  end

  def generate_docx
    respond_to do |format|
      format.json do
        @report.update!(docx_file_processing: true)
        log_activity(:generate_docx_report)
        Reports::DocxJob.perform_later(@report, current_user, current_team, root_url)
        render json: {
          message: I18n.t('projects.reports.index.generation.accepted_message')
        }
      end
    end
  end

  def save_pdf_to_inventory_modal
    respond_to do |format|
      format.json do
        render json: {
          html: render_to_string(partial: 'reports/save_PDF_to_inventory_modal.html.erb')
        }
      end
    end
  end

  def save_pdf_to_inventory_item
    return render_404 unless @report.pdf_file.attached?

    save_pdf_to_inventory_item = ReportActions::SavePdfToInventoryItem.new(
      @report, current_user, current_team, save_pdf_params
    )
    if save_pdf_to_inventory_item.save
      render json: {
        message: I18n.t(
          'projects.reports.new.save_PDF_to_inventory_modal.success_flash'
        )
      }, status: :ok
    else
      render json: { message: save_pdf_to_inventory_item.error_messages },
             status: :unprocessable_entity
    end
  rescue ReportActions::RepositoryPermissionError => e
    render json: { message: e.message }, status: :forbidden
  rescue StandardError => e
    render json: { message: e.message }, status: :internal_server_error
  end

  # Modal for saving the existsing/new report
  def save_modal
    # Assume user is updating existing report
    @report = @project.reports.find_by_id(params[:id])
    @method = :put

    # Case when saving a new report
    if @report.blank?
      @report = Report.new
      @method = :post
      @url = project_reports_path(@project, format: :json)
    else
      @url = project_report_path(@project, @report, format: :json)
    end

    render_403 and return unless params.include? :contents

    @report_contents = params[:contents]

    respond_to do |format|
      format.json do
        render json: {
          html: render_to_string(
            partial: 'reports/new/modal/save.html.erb'
          )
        }
      end
    end
  end

  # Experiment for adding contents into experiment element
  def experiment_contents_modal
    experiment = @project.experiments.find_by_id(params[:experiment_id])

    respond_to do |format|
      if experiment.blank?
        format.json do
          render json: {}, status: :not_found
        end
      else
        format.json do
          render json: {
            html: render_to_string(
              partial: 'reports/new/modal/experiment_contents.html.erb',
              locals: { project: @project, experiment: experiment }
            )
          }
        end
      end
    end
  end

  # Modal for adding contents into module element
  def module_contents_modal
    my_module = MyModule.find_by_id(params[:my_module_id])
    return render_403 unless my_module.experiment.project == @project

    respond_to do |format|
      if my_module.blank?
        format.json do
          render json: {}, status: :not_found
        end
      else
        format.json do
          render json: {
            html: render_to_string(
              partial: 'reports/new/modal/module_contents.html.erb',
              locals: { project: @project, my_module: my_module }
            )
          }
        end
      end
    end
  end

  # Modal for adding contents into step element
  def step_contents_modal
    step = Step.find_by_id(params[:step_id])
    return render_403 unless step.my_module.experiment.project == @project

    respond_to do |format|
      if step.blank?
        format.json do
          render json: {}, status: :not_found
        end
      else
        format.json do
          render json: {
            html: render_to_string(
              partial: 'reports/new/modal/step_contents.html.erb',
              locals: { project: @project, step: step }
            )
          }
        end
      end
    end
  end

  # Modal for adding contents into result element
  def result_contents_modal
    result = Result.find_by_id(params[:result_id])
    return render_403 unless result.experiment.project == @project

    respond_to do |format|
      if result.blank?
        format.json do
          render json: {}, status: :not_found
        end
      else
        format.json do
          render json: {
            html: render_to_string(
              partial: 'reports/new/modal/result_contents.html.erb',
              locals: { project: @project, result: result }
            )
          }
        end
      end
    end
  end

  def project_contents
    render json: {
      html: render_to_string(
        partial: 'reports/wizard/project_contents.html.erb',
        locals: { project: @project, report: nil}
      )
    }
  end

  def experiment_contents
    experiment = @project.experiments.find_by(id: params[:id])
    module_ids = (params[:modules].select { |_, p| p == '1' }).keys.collect(&:to_i)
    selected_modules = experiment.my_modules.where(id: module_ids)

    respond_to do |format|
      if experiment.blank?
        format.json { render json: {}, status: :not_found }
      elsif selected_modules.blank?
        format.json { render json: {}, status: :no_content }
      else
        elements = generate_experiment_contents_json(selected_modules)
      end

      if elements_empty? elements
        format.json { render json: {}, status: :no_content }
      else
        format.json do
          render json: {
            status: :ok,
            elements: elements
          }
        end
      end
    end
  end

  def module_contents
    my_module = MyModule.find_by_id(params[:id])
    return render_403 unless my_module.experiment.project == @project

    respond_to do |format|
      if my_module.blank?
        format.json { render json: {}, status: :not_found }
      else
        elements = generate_module_contents_json(my_module)

        if elements_empty? elements
          format.json { render json: {}, status: :no_content }
        else
          format.json do
            render json: {
              status: :ok,
              elements: elements
            }
          end
        end
      end
    end
  end

  def step_contents
    step = Step.find_by_id(params[:id])
    return render_403 unless step.my_module.experiment.project == @project

    respond_to do |format|
      if step.blank?
        format.json { render json: {}, status: :not_found }
      else
        elements = generate_step_contents_json(step)

        if elements_empty? elements
          format.json { render json: {}, status: :no_content }
        else
          format.json {
            render json: {
              status: :ok,
              elements: elements
            }
          }
        end
      end
    end
  end

  def result_contents
    result = Result.find_by_id(params[:id])
    return render_403 unless result.my_module.experiment.project == @project

    respond_to do |format|
      if result.blank?
        format.json { render json: {}, status: :not_found }
      else
        elements = generate_result_contents_json(result)

        if elements_empty? elements
          format.json { render json: {}, status: :no_content }
        else
          format.json {
            render json: {
              status: :ok,
              elements: elements
            }
          }
        end
      end
    end
  end

  def available_repositories
    render json: { results: @available_repositories }, status: :ok
  end

  def document_preview
    render json: { html: render_to_string(
      partial: 'reports/content_document_preview.html.erb',
      locals: {
        report: @report,
        report_type: params[:report_type]
      }
    ) }
  end

  private

  include StringUtility
  AvailableRepository = Struct.new(:id, :name)

  def load_vars
    @report = current_team.reports.find_by(id: params[:id])
    render_404 unless @report
    render_403 unless can_read_project?(@report.project)
  end

  def load_vars_nested
    @project = current_team.projects.find_by(id: params[:project_id])
    render_404 unless @project
    render_403 unless can_read_project?(@project)
  end

  def check_manage_permissions
    render_403 unless can_manage_reports?(@project.team)
  end

  def load_visible_projects
    render_404 unless current_team
    @visible_projects = Project.viewable_by_user(
      current_user, current_team
    ).select(:id, :name)
  end

  def load_available_repositories
    @available_repositories = []
    repositories = Repository.active
                             .accessible_by_teams(current_team)
                             .name_like(search_params[:q])
                             .limit(Constants::SEARCH_LIMIT)
                             .select(:id, :name, :team_id, :permission_level)
    repositories.each do |repository|
      next unless can_manage_repository_rows?(current_user, repository)

      @available_repositories.push(AvailableRepository.new(repository.id,
                                                           ellipsize(repository.name, 75, 50)))
    end
  end

  def report_params
    params.require(:report)
          .permit(:name, :description, :grouped_by, :report_contents, settings: {})
  end

  def search_params
    params.permit(:q)
  end

  def save_pdf_params
    params.permit(:repository_id, :respository_column_id, :repository_item_id)
  end

  def log_activity(type_of, report = @report)
    Activities::CreateActivityService
      .call(activity_type: type_of,
            owner: current_user,
            subject: report,
            team: report.team,
            project: report.project,
            message_items: { report: report.id })
  end

  def generate_pdf_report
    log_activity(:generate_pdf_report)
    Reports::PdfJob.perform_later(@report, current_user) if @report.persisted?
  end
end