defmodule DaProductApp.QRProviders.WeChat do
  @behaviour DaProductApp.QRProvider
  require Logger

  @impl true
  def generate(provider_params) do
    # Extract required parameters from the unified provider_params structure
    device_id = provider_params[:device_id]
    amount = provider_params[:amount]
    transaction_refid = provider_params[:transaction_refid]
    merchant_id = provider_params[:merchant_id]
    m_ref_num = provider_params[:m_ref_num]
    
    # Shukria terminal data (available if needed)
    stid = provider_params[:stid]
    ptid = provider_params[:ptid]  # provider_tid
    pmid = provider_params[:pmid]  # provider_mid
    
    Logger.info("Entering WeChat.generate function")
    Logger.debug("""
    WeChat.generate called with unified provider_params:
    device_id: #{device_id},
    amount: #{amount},
    transaction_refid: #{transaction_refid},
    merchant_id: #{merchant_id},
    m_ref_num: #{m_ref_num},
    stid: #{stid},
    ptid: #{ptid},
    pmid: #{pmid}
    """)
    
    # Call WeChat+ SDK / API, return {:ok, qr}
    # For now, using the simple implementation with access to all provider params
    {:ok, "WECHAT+_QR_#{device_id}_#{amount}_#{m_ref_num}"}
  end
end