require "prawn"
require "prawn/qrcode"
require "rqrcode"

# Service de génération de billets PDF utilisant Prawn
#
# Génère des billets PDF simples et compacts avec codes QR pour la validation d'entrée
# Design propre et minimaliste qui tient sur une seule page
class TicketPdfGenerator
  # Suppress Prawn's internationalization warning for built-in fonts
  Prawn::Fonts::AFM.hide_m17n_warning = true
  attr_reader :ticket

  def initialize(ticket)
    @ticket = ticket
  end

  def generate
    Prawn::Document.new(page_size: [ 350, 600 ], margin: 20) do |pdf|
      # Header
      pdf.fill_color "2D1B69"
      pdf.font "Helvetica", style: :bold, size: 24
      pdf.text ENV.fetch("APP_NAME", "Aperonight"), align: :center
      pdf.move_down 10

      # Event name
      pdf.fill_color "000000"
      pdf.font "Helvetica", style: :bold, size: 18
      pdf.text ticket.event.name, align: :center
      pdf.move_down 10

      # Ticket info box
      pdf.stroke_color "E5E7EB"
      pdf.fill_color "F9FAFB"
      pdf.rounded_rectangle [ 0, pdf.cursor ], 310, 150, 10
      pdf.fill_and_stroke

      pdf.move_down 10
      pdf.fill_color "000000"
      pdf.font "Helvetica", size: 12

      # Customer name
      pdf.indent 10 do
        pdf.text "Titulaire du billet :", style: :bold
        pdf.text "#{ticket.first_name} #{ticket.last_name}"
      end
      pdf.move_down 8

      # Ticket details
      pdf.indent 10 do
        pdf.text "Type de billet :", style: :bold
        pdf.text ticket.ticket_type.name
      end
      pdf.move_down 8

      pdf.indent 10 do
        pdf.text "Prix :", style: :bold
        pdf.text "#{ticket.price_euros} €"
      end
      pdf.move_down 8

      pdf.indent 10 do
        pdf.text "Date et heure :", style: :bold
        pdf.text ticket.event.start_time.strftime("%d %B %Y à %H:%M")
      end
      pdf.move_down 20

      # Informations sur le lieu
      pdf.fill_color "374151"
      pdf.font "Helvetica", style: :bold, size: 14
      pdf.text "Informations sur le lieu"
      pdf.move_down 8

      pdf.font "Helvetica", size: 11
      pdf.text ticket.event.venue_name, style: :bold
      pdf.text ticket.event.venue_address
      pdf.move_down 20

      # Code QR
      pdf.fill_color "000000"
      pdf.font "Helvetica", style: :bold, size: 14
      pdf.text "Code QR", align: :center
      pdf.move_down 10

      # Ensure all required data is present before generating QR code
      if ticket.qr_code.blank?
        raise "Ticket QR code is missing"
      end

      # Build QR code data with safe association loading
      qr_code_data = build_qr_code_data(ticket)

      # Validate QR code data before creating QR code
      if qr_code_data.blank? || qr_code_data == "{}"
        Rails.logger.error "QR code data is empty: ticket_id=#{ticket.id}, qr_code=#{ticket.qr_code}, event_id=#{ticket.ticket_type&.event_id}, user_id=#{ticket.order&.user_id}"
        raise "QR code data is empty or invalid"
      end

      # Ensure qr_code_data is a proper string for QR code generation
      unless qr_code_data.is_a?(String) && qr_code_data.length > 2
        Rails.logger.error "QR code data is not a valid string: #{qr_code_data.inspect} (class: #{qr_code_data.class})"
        raise "QR code data must be a valid string"
      end

      # Generate QR code - prawn-qrcode expects the data string directly
      pdf.print_qr_code(qr_code_data, extent: 120, align: :center)

      pdf.move_down 15

      # QR code text
      pdf.font "Helvetica", size: 8
      pdf.fill_color "6B7280"
      pdf.text "#{ticket.qr_code}", align: :center


      # Ticket ID
      pdf.font "Helvetica", size: 8
      pdf.fill_color "6B7280"
      pdf.text "ID du billet : #{ticket.id}", align: :center

      # Footer
      pdf.move_down 30
      pdf.stroke_color "E5E7EB"
      pdf.horizontal_line 0, 310
      pdf.move_down 6

      pdf.font "Helvetica", size: 8
      pdf.fill_color "6B7280"
      pdf.text "Ce billet est valable pour une seule entrée.", align: :center
      pdf.text "Présentez ce billet à l'entrée du lieu.", align: :center
      pdf.move_down 5
      pdf.text "Généré le #{Time.current.strftime('%d %B %Y à %H:%M')}", align: :center
    end.render
  end

  private

  def create_simple_header(pdf)
    # Nom de la marque
    pdf.fill_color "6366F1"
    pdf.font "Helvetica", style: :bold, size: 24
    pdf.text "AperoNight", align: :center

    pdf.move_down 5
    pdf.font "Helvetica", size: 10
    pdf.fill_color "64748B"
    pdf.text "Billet d'entree", align: :center

    pdf.move_down 20

    # Simple divider line
    pdf.stroke_color "E5E7EB"
    pdf.horizontal_line 0, pdf.bounds.width
    pdf.move_down 20
  end

  def create_ticket_info(pdf)
    # Nom de l'événement - proéminent
    pdf.fill_color "1F2937"
    pdf.font "Helvetica", style: :bold, size: 18
    pdf.text ticket.event.name, align: :center
    pdf.move_down 15

    # Two-column layout for ticket details
    pdf.bounding_box([ 0, pdf.cursor ], width: pdf.bounds.width, height: 120) do
      # Left column
      pdf.bounding_box([ 0, pdf.cursor ], width: pdf.bounds.width / 2 - 20, height: 120) do
        create_info_item(pdf, "Date", ticket.event.start_time.strftime("%d %B %Y"))
        create_info_item(pdf, "Heure", ticket.event.start_time.strftime("%H:%M"))
        create_info_item(pdf, "Lieu", ticket.event.venue_name)
      end

      # Right column
      pdf.bounding_box([ pdf.bounds.width / 2 + 20, pdf.cursor ], width: pdf.bounds.width / 2 - 20, height: 120) do
        create_info_item(pdf, "Type", ticket.ticket_type.name)
        create_info_item(pdf, "Prix", "#{sprintf('%.2f', ticket.price_euros)} €")
        create_info_item(pdf, "Titulaire", "#{ticket.first_name} #{ticket.last_name}")
      end
    end

    pdf.move_down 30
  end

  def create_info_item(pdf, label, value)
    pdf.font "Helvetica", style: :bold, size: 9
    pdf.fill_color "64748B"
    pdf.text label.upcase

    pdf.move_down 2
    pdf.font "Helvetica", size: 11
    pdf.fill_color "1F2937"
    pdf.text value
    pdf.move_down 12
  end

  def create_qr_section(pdf)
    # Center the QR code horizontally
    qr_size = 120
    x_position = (pdf.bounds.width - qr_size) / 2

    pdf.bounding_box([ x_position, pdf.cursor ], width: qr_size, height: qr_size + 40) do
      # QR Code title
      pdf.font "Helvetica", style: :bold, size: 12
      pdf.fill_color "1F2937"
      pdf.text "Code d'entree", align: :center
      pdf.move_down 10

      # Generate QR code
      generate_simple_qr_code(pdf, qr_size)

      pdf.move_down 10

      # QR code ID
      pdf.font "Helvetica", size: 8
      pdf.fill_color "64748B"
      pdf.text "ID: #{ticket.qr_code[0..15]}...", align: :center
    end

    pdf.move_down 40
  end

  def generate_simple_qr_code(pdf, size)
    # Ensure all required data is present before generating QR code
    if ticket.qr_code.blank?
      raise "Ticket QR code is missing"
    end

    # Build QR code data with safe association loading
    qr_code_data = build_qr_code_data(ticket)

    # Validate QR code data before creating QR code
    if qr_code_data.blank? || qr_code_data == "{}"
      Rails.logger.error "QR code data is empty: ticket_id=#{ticket.id}, qr_code=#{ticket.qr_code}, event_id=#{ticket.ticket_type&.event_id}, user_id=#{ticket.order&.user_id}"
      raise "QR code data is empty or invalid"
    end

    # Ensure qr_code_data is a proper string for QR code generation
    unless qr_code_data.is_a?(String) && qr_code_data.length > 2
      Rails.logger.error "QR code data is not a valid string: #{qr_code_data.inspect} (class: #{qr_code_data.class})"
      raise "QR code data must be a valid string"
    end

    # Generate QR code
    pdf.print_qr_code(qr_code_data, extent: size, align: :center)
  end

  def create_simple_footer(pdf)
    # Security notice
    pdf.font "Helvetica", size: 8
    pdf.fill_color "64748B"
    pdf.text "Ce billet est valable pour une seule entree.", align: :center
    pdf.text "Presentez ce code QR a l'entree de l'evenement.", align: :center

    pdf.move_down 10

    # Divider line
    pdf.stroke_color "E5E7EB"
    pdf.horizontal_line 0, pdf.bounds.width
    pdf.move_down 5

    # Generation timestamp
    pdf.font "Helvetica", size: 7
    pdf.fill_color "9CA3AF"
    timestamp = "Genere le #{Time.current.strftime('%d/%m/%Y a %H:%M')}"
    pdf.text timestamp, align: :center
  end

  def build_qr_code_data(ticket)
    # Try multiple approaches to get valid QR code data
    begin
      # Primary approach: full JSON with all data
      data = {
        ticket_id: ticket.id,
        qr_code: ticket.qr_code,
        event_id: ticket.ticket_type&.event_id,
        user_id: ticket.order&.user_id
      }.compact

      # Ensure we have the minimum required data
      if data[:ticket_id] && data[:qr_code]
        return data.to_json
      end
    rescue StandardError => e
      Rails.logger.warn "Failed to build complex QR data: #{e.message}"
    end

    # Fallback approach: just use the ticket's QR code string
    begin
      return ticket.qr_code.to_s if ticket.qr_code.present?
    rescue StandardError => e
      Rails.logger.warn "Failed to use ticket QR code: #{e.message}"
    end

    # Final fallback: simple ticket identifier
    "TICKET-#{ticket.id}"
  end
end