class EventsController < ApplicationController
  before_action :authenticate_user!, only: [ :checkout, :collect_names, :process_names, :payment_success, :download_ticket ]
  before_action :set_event, only: [ :show, :checkout, :collect_names, :process_names ]

  # Display all events
  def index
    @events = Event.includes(:user).upcoming.page(params[:page]).per(12)
  end

  # Display desired event
  def show
    # Event is set by set_event callback
  end

  # Handle checkout process - Collect names if needed or create Stripe session
  def checkout
    # Convert cart parameter to proper hash
    cart_param = params[:cart]
    cart_data = if cart_param.is_a?(String)
                  JSON.parse(cart_param)
                elsif cart_param.is_a?(ActionController::Parameters)
                  cart_param.to_unsafe_h
                else
                  {}
                end

    if cart_data.empty?
      redirect_to event_path(@event.slug, @event), alert: "Veuillez sélectionner au moins un billet"
      return
    end

    # Check if any ticket types require names
    requires_names = false
    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

      if ticket_type.requires_id
        requires_names = true
        break
      end
    end

    # If names are required, redirect to name collection
    if requires_names
      session[:pending_cart] = cart_data
      redirect_to event_collect_names_path(@event.slug, @event)
      return
    end

    # Otherwise proceed directly to payment
    process_payment(cart_data)
  end

  # Display form to collect names for tickets
  def collect_names
    @cart_data = session[:pending_cart] || {}

    if @cart_data.empty?
      redirect_to event_path(@event.slug, @event), alert: "Veuillez sélectionner au moins un billet"
      return
    end

    # Build list of tickets requiring names
    @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

      if ticket_type.requires_id
        quantity.times do |i|
          @tickets_needing_names << {
            ticket_type_id: ticket_type.id,
            ticket_type_name: ticket_type.name,
            index: i
          }
        end
      end
    end
  end

  # Process submitted names and create Stripe session
  def process_names
    cart_data = session[:pending_cart] || {}

    if cart_data.empty?
      redirect_to event_path(@event.slug, @event), alert: "Veuillez sélectionner au moins un billet"
      return
    end

    # Store names in session for later use
    if params[:ticket_names].present?
      # Convert ActionController::Parameters to hash
      if params[:ticket_names].is_a?(ActionController::Parameters)
        session[:ticket_names] = params[:ticket_names].to_unsafe_h
      else
        session[:ticket_names] = params[:ticket_names]
      end
    end

    # Proceed to payment
    process_payment(cart_data)
  end

  # Handle successful payment
  def payment_success
    session_id = params[:session_id]
    event_id = params[:event_id]

    # Check if Stripe is properly configured
    unless stripe_configured?
      redirect_to event_path(@event.slug, @event), alert: "Le système de paiement n'est pas correctement configuré. Veuillez contacter l'administrateur."
      return
    end

    # Initialize Stripe during checkout
    unless initialize_stripe
      redirect_to event_path(@event.slug, @event), alert: "Impossible d'initialiser le système de paiement. Veuillez réessayer plus tard."
      return
    end

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

      if session.payment_status == "paid"
        # Create tickets
        @event = Event.find(event_id)
        order_items = JSON.parse(session.metadata["order_items"])
        @tickets = []

        # Get names from session if they exist
        ticket_names = session.metadata["ticket_names"] ? JSON.parse(session.metadata["ticket_names"]) : {}

        order_items.each do |item|
          ticket_type = TicketType.find(item["ticket_type_id"])
          item["quantity"].times do |i|
            # Get names if this ticket type requires them
            first_name = nil
            last_name = nil

            if ticket_type.requires_id
              name_key = "#{ticket_type.id}_#{i}"
              names = ticket_names[name_key] || {}
              first_name = names["first_name"]
              last_name = names["last_name"]
            end

            ticket = Ticket.create!(
              user: current_user,
              ticket_type: ticket_type,
              status: "active",
              first_name: first_name,
              last_name: last_name
            )
            @tickets << ticket

            # Send confirmation email for each ticket
            TicketMailer.purchase_confirmation(ticket).deliver_now
          end
        end

        # Clear session data
        session.delete(:pending_cart)
        session.delete(:ticket_names)

        render "payment_success"
      else
        redirect_to event_path(@event.slug, @event), alert: "Le paiement n'a pas été complété avec succès"
      end
    rescue Stripe::StripeError => e
      redirect_to dashboard_path, alert: "Erreur lors du traitement de votre confirmation de paiement : #{e.message}"
    rescue => e
      redirect_to dashboard_path, alert: "Une erreur inattendue s'est produite : #{e.message}"
    end
  end

  # Download ticket PDF
  def download_ticket
    @ticket = current_user.tickets.find(params[:ticket_id])

    respond_to do |format|
      format.pdf do
        pdf = @ticket.to_pdf
        send_data pdf,
          filename: "ticket-#{@ticket.event.name.parameterize}-#{@ticket.qr_code[0..7]}.pdf",
          type: "application/pdf",
          disposition: "attachment"
      end
    end
  end

  private

  def set_event
    @event = Event.includes(:ticket_types).find(params[:id])
  end

  # Process payment and create Stripe session
  def process_payment(cart_data)
    # Create order items from cart
    line_items = []
    order_items = []
    total_amount = 0

    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

      # Check availability
      available = ticket_type.quantity - ticket_type.tickets.count
      if quantity > available
        redirect_to event_path(@event.slug, @event), alert: "Pas assez de billets disponibles pour #{ticket_type.name}"
        return
      end

      # Create Stripe line item
      line_items << {
        price_data: {
          currency: "eur",
          product_data: {
            name: "#{@event.name} - #{ticket_type.name}",
            description: ticket_type.description
          },
          unit_amount: ticket_type.price_cents
        },
        quantity: quantity
      }

      # Store for ticket creation
      order_items << {
        ticket_type_id: ticket_type.id,
        ticket_type_name: ticket_type.name,
        quantity: quantity,
        price_cents: ticket_type.price_cents
      }

      total_amount += ticket_type.price_cents * quantity
    end

    if order_items.empty?
      redirect_to event_path(@event.slug, @event), alert: "Commande invalide"
      return
    end

    # Get ticket names from session if they exist
    ticket_names = session[:ticket_names] || {}

    # Check if Stripe is properly configured
    unless stripe_configured?
      redirect_to event_path(@event.slug, @event), alert: "Le système de paiement n'est pas correctement configuré. Veuillez contacter l'administrateur."
      return
    end

    # Initialize Stripe during checkout
    unless initialize_stripe
      redirect_to event_path(@event.slug, @event), alert: "Impossible d'initialiser le système de paiement. Veuillez réessayer plus tard."
      return
    end

    begin
      # Create Stripe Checkout Session
      session = Stripe::Checkout::Session.create({
        payment_method_types: [ "card" ],
        line_items: line_items,
        mode: "payment",
        success_url: payment_success_url(event_id: @event.id, session_id: "{CHECKOUT_SESSION_ID}"),
        cancel_url: event_url(@event.slug, @event),
        customer_email: current_user.email,
        metadata: {
          event_id: @event.id,
          user_id: current_user.id,
          order_items: order_items.to_json,
          ticket_names: ticket_names.to_json
        }
      })

      redirect_to session.url, allow_other_host: true
    rescue Stripe::StripeError => e
      redirect_to event_path(@event.slug, @event), alert: "Erreur de traitement du paiement : #{e.message}"
    end
  end
end