# API controller for order management
# Provides RESTful endpoints for order operations

module Api
  module V1
    class OrdersController < ApiController
      before_action :authenticate_user!
      before_action :set_order, only: [ :show, :checkout, :retry_payment, :increment_payment_attempt ]
      before_action :set_event, only: [ :new, :create ]

      # Skip API key authentication for increment_payment_attempt action (used by frontend forms)
      skip_before_action :authenticate_api_key, only: [ :increment_payment_attempt ]

      # GET /api/v1/orders/new
      # Returns data needed for new order form
      def new
        cart_data = params[:cart_data] || session[:pending_cart] || {}

        if cart_data.empty?
          render json: { error: "Veuillez d'abord sélectionner vos billets sur la page de l'événement" }, status: :bad_request
          return
        end

        tickets_needing_names = []
        cart_data.each do |ticket_type_id, item|
          ticket_type = @event.ticket_types.find_by(id: ticket_type_id)
          next unless ticket_type

          quantity = item["quantity"].to_i
          next if quantity <= 0

          quantity.times do |i|
            tickets_needing_names << {
              ticket_type_id: ticket_type.id,
              ticket_type_name: ticket_type.name,
              ticket_type_price: ticket_type.price_cents,
              index: i
            }
          end
        end

        render json: { tickets_needing_names: tickets_needing_names }, status: :ok
      end

      # POST /api/v1/orders
      # Creates a new order with tickets
      def create
        cart_data = params[:cart_data] || session[:pending_cart] || {}

        if cart_data.empty?
          render json: { error: "Aucun billet sélectionné" }, status: :bad_request
          return
        end

        success = false

        ActiveRecord::Base.transaction do
          @order = current_user.orders.create!(event: @event, status: "draft")

          order_params[:tickets_attributes]&.each do |index, ticket_attrs|
            next if ticket_attrs[:first_name].blank? || ticket_attrs[:last_name].blank?

            ticket_type = @event.ticket_types.find(ticket_attrs[:ticket_type_id])

            ticket = @order.tickets.build(
              ticket_type: ticket_type,
              first_name: ticket_attrs[:first_name],
              last_name: ticket_attrs[:last_name],
              status: "draft"
            )

            unless ticket.save
              render json: { error: "Erreur lors de la création des billets: #{ticket.errors.full_messages.join(', ')}" }, status: :unprocessable_entity
              raise ActiveRecord::Rollback
            end
          end

          if @order.tickets.present?
            @order.calculate_total!
            success = true
          else
            render json: { error: "Aucun billet valide créé" }, status: :unprocessable_entity
            raise ActiveRecord::Rollback
          end
        end

        if success
          session[:draft_order_id] = @order.id
          session.delete(:pending_cart)
          render json: { order: @order, redirect_to: checkout_order_path(@order) }, status: :created
        end
      rescue => e
        error_message = e.message.present? ? e.message : "Erreur inconnue"
        render json: { error: "Une erreur est survenue: #{error_message}" }, status: :internal_server_error
      end

      # GET /api/v1/orders/:id
      # Returns order summary
      def show
        tickets = @order.tickets.includes(:ticket_type)
        render json: { order: @order, tickets: tickets }, status: :ok
      end

      # GET /api/v1/orders/:id/checkout
      # Returns checkout data for an order
      def checkout
        if @order.expired?
          @order.expire_if_overdue!
          render json: { error: "Votre commande a expiré. Veuillez recommencer." }, status: :gone
          return
        end

        tickets = @order.tickets.includes(:ticket_type)
        total_amount = @order.total_amount_cents
        expiring_soon = @order.expiring_soon?

        checkout_session = nil
        if Rails.application.config.stripe[:secret_key].present?
          begin
            checkout_session = create_stripe_session
          rescue => e
            error_message = e.message.present? ? e.message : "Erreur Stripe inconnue"
            Rails.logger.error "Stripe checkout session creation failed: #{error_message}"
            render json: { error: "Erreur lors de la création de la session de paiement" }, status: :internal_server_error
            return
          end
        end

        render json: {
          order: @order,
          tickets: tickets,
          total_amount: total_amount,
          expiring_soon: expiring_soon,
          checkout_session: checkout_session
        }, status: :ok
      end

      # PATCH /api/v1/orders/:id/increment_payment_attempt
      # Increments payment attempt counter
      def increment_payment_attempt
        @order.increment_payment_attempt!
        render json: { success: true, attempts: @order.payment_attempts }, status: :ok
      end

      # POST /api/v1/orders/:id/retry_payment
      # Allows retrying payment for failed orders
      def retry_payment
        unless @order.can_retry_payment?
          render json: { error: "Cette commande ne peut plus être payée" }, status: :forbidden
          return
        end

        render json: { redirect_to: checkout_order_path(@order) }, status: :ok
      end

      # GET /api/v1/orders/payment_success
      # Handles successful payment confirmation
      def payment_success
        session_id = params[:session_id]

        stripe_configured = Rails.application.config.stripe[:secret_key].present?
        Rails.logger.debug "Payment success - Stripe configured: #{stripe_configured}"

        unless stripe_configured
          render json: { error: "Le système de paiement n'est pas correctement configuré. Veuillez contacter l'administrateur." }, status: :service_unavailable
          return
        end

        begin
          stripe_session = Stripe::Checkout::Session.retrieve(session_id)

          if stripe_session.payment_status == "paid"
            order_id = stripe_session.metadata["order_id"]

            unless order_id.present?
              render json: { error: "Informations de commande manquantes" }, status: :bad_request
              return
            end

            @order = current_user.orders.includes(tickets: :ticket_type).find(order_id)
            @order.mark_as_paid!

            begin
              StripeInvoiceGenerationJob.perform_later(@order.id)
              Rails.logger.info "Scheduled Stripe invoice generation for order #{@order.id}"
            rescue => e
              Rails.logger.error "Failed to schedule invoice generation for order #{@order.id}: #{e.message}"
            end

            @order.tickets.each do |ticket|
              begin
                TicketMailer.purchase_confirmation(ticket).deliver_now
              rescue => e
                Rails.logger.error "Failed to send confirmation email for ticket #{ticket.id}: #{e.message}"
              end
            end

            session.delete(:pending_cart)
            session.delete(:ticket_names)
            session.delete(:draft_order_id)

            render json: { order: @order, tickets: @order.tickets }, status: :ok
          else
            render json: { error: "Le paiement n'a pas été complété avec succès" }, status: :payment_required
          end
        rescue Stripe::StripeError => e
          error_message = e.message.present? ? e.message : "Erreur Stripe inconnue"
          render json: { error: "Erreur lors du traitement de votre confirmation de paiement : #{error_message}" }, status: :bad_request
        rescue => e
          error_message = e.message.present? ? e.message : "Erreur inconnue"
          Rails.logger.error "Payment success error: #{e.class} - #{error_message}"
          render json: { error: "Une erreur inattendue s'est produite : #{error_message}" }, status: :internal_server_error
        end
      end

      # POST /api/v1/orders/payment_cancel
      # Handles payment cancellation
      def payment_cancel
        order_id = params[:order_id] || session[:draft_order_id]

        if order_id.present?
          order = current_user.orders.find_by(id: order_id, status: "draft")

          if order&.can_retry_payment?
            render json: { message: "Le paiement a été annulé. Vous pouvez réessayer.", redirect_to: checkout_order_path(order) }, status: :ok
          else
            session.delete(:draft_order_id)
            render json: { message: "Le paiement a été annulé et votre commande a expiré." }, status: :gone
          end
        else
          render json: { message: "Le paiement a été annulé" }, status: :ok
        end
      end

      private

      def set_order
        @order = current_user.orders.includes(:tickets, :event).find(params[:id])
      rescue ActiveRecord::RecordNotFound
        render json: { error: "Commande non trouvée" }, status: :not_found
      end

      def set_event
        @event = Event.includes(:ticket_types).find(params[:id])
      rescue ActiveRecord::RecordNotFound
        render json: { error: "Événement non trouvé" }, status: :not_found
      end

      def order_params
        params.permit(tickets_attributes: [ :ticket_type_id, :first_name, :last_name ])
      end

      def create_stripe_session
        line_items = @order.tickets.map do |ticket|
          {
            price_data: {
              currency: "eur",
              product_data: {
                name: "#{@order.event.name} - #{ticket.ticket_type.name}",
                description: ticket.ticket_type.description
              },
              unit_amount: ticket.price_cents
            },
            quantity: 1
          }
        end

        Stripe::Checkout::Session.create(
          payment_method_types: [ "card" ],
          line_items: line_items,
          mode: "payment",
          success_url: order_payment_success_url + "?session_id={CHECKOUT_SESSION_ID}",
          cancel_url: order_payment_cancel_url,
          metadata: {
            order_id: @order.id,
            user_id: current_user.id
          }
        )
      end
    end
  end
end