module API
  module V3
    class Files < Grape::API
      helpers do
        def commit_params(attrs)
          {
            file_path: attrs[:file_path],
            start_branch: attrs[:branch],
            branch_name: attrs[:branch],
            commit_message: attrs[:commit_message],
            file_content: attrs[:content],
            file_content_encoding: attrs[:encoding],
            author_email: attrs[:author_email],
            author_name: attrs[:author_name]
          }
        end

        def commit_response(attrs)
          {
            file_path: attrs[:file_path],
            branch: attrs[:branch]
          }
        end

        params :simple_file_params do
          requires :file_path, type: String, desc: 'The path to new file. Ex. lib/class.rb'
          requires :branch_name, type: String, desc: 'The name of branch'
          requires :commit_message, type: String, desc: 'Commit Message'
          optional :author_email, type: String, desc: 'The email of the author'
          optional :author_name, type: String, desc: 'The name of the author'
        end

        params :extended_file_params do
          use :simple_file_params
          requires :content, type: String, desc: 'File content'
          optional :encoding, type: String, values: %w[base64], desc: 'File encoding'
        end
      end

      params do
        requires :id, type: String, desc: 'The project ID'
      end
      resource :projects, requirements: { id: %r{[^/]+} } do
        desc 'Get a file from repository'
        params do
          requires :file_path, type: String, desc: 'The path to the file. Ex. lib/class.rb'
          requires :ref, type: String, desc: 'The name of branch, tag, or commit'
        end
        get ":id/repository/files" do
          authorize! :download_code, user_project

          commit = user_project.commit(params[:ref])
          not_found!('Commit') unless commit

          repo = user_project.repository
          blob = repo.blob_at(commit.sha, params[:file_path])
          not_found!('File') unless blob

          blob.load_all_data!
          status(200)

          {
            file_name: blob.name,
            file_path: blob.path,
            size: blob.size,
            encoding: "base64",
            content: Base64.strict_encode64(blob.data),
            ref: params[:ref],
            blob_id: blob.id,
            commit_id: commit.id,
            last_commit_id: repo.last_commit_id_for_path(commit.sha, params[:file_path])
          }
        end

        desc 'Create new file in repository'
        params do
          use :extended_file_params
        end
        post ":id/repository/files" do
          authorize! :push_code, user_project

          file_params = declared_params(include_missing: false)
          file_params[:branch] = file_params.delete(:branch_name)

          result = ::Files::CreateService.new(user_project, current_user, commit_params(file_params)).execute

          if result[:status] == :success
            status(201)
            commit_response(file_params)
          else
            render_api_error!(result[:message], 400)
          end
        end

        desc 'Update existing file in repository'
        params do
          use :extended_file_params
        end
        put ":id/repository/files" do
          authorize! :push_code, user_project

          file_params = declared_params(include_missing: false)
          file_params[:branch] = file_params.delete(:branch_name)

          result = ::Files::UpdateService.new(user_project, current_user, commit_params(file_params)).execute

          if result[:status] == :success
            status(200)
            commit_response(file_params)
          else
            http_status = result[:http_status] || 400
            render_api_error!(result[:message], http_status)
          end
        end

        desc 'Delete an existing file in repository'
        params do
          use :simple_file_params
        end
        delete ":id/repository/files" do
          authorize! :push_code, user_project

          file_params = declared_params(include_missing: false)
          file_params[:branch] = file_params.delete(:branch_name)

          result = ::Files::DeleteService.new(user_project, current_user, commit_params(file_params)).execute

          if result[:status] == :success
            status(200)
            commit_response(file_params)
          else
            render_api_error!(result[:message], 400)
          end
        end
      end
    end
  end
end
