module order_matching_engine (
  input wire clk,
  input wire rst_n,
  input wire [31:0] order_data,
  input wire order_valid,
  output reg [31:0] trade_data,
  output reg trade_valid,
  // TCP/IP stack interfaces
  input wire [31:0] tcp_rx_data,
  input wire tcp_rx_valid,
  output reg [31:0] tcp_tx_data,
  output reg tcp_tx_valid,
  // AXI stream interfaces
  input wire [31:0] s_axis_data,
  input wire s_axis_valid,
  output reg s_axis_ready,
  output reg [31:0] m_axis_data,
  output reg m_axis_valid,
  input wire m_axis_ready
);

  // Advanced order types
  parameter LIMIT_ORDER = 2'b00;
  parameter MARKET_ORDER = 2'b01;
  parameter STOP_ORDER = 2'b10;
  parameter TRAILING_STOP_ORDER = 2'b11;

  // Execution strategies
  parameter AGGRESSIVE_STRATEGY = 2'b00;
  parameter PASSIVE_STRATEGY = 2'b01;
  parameter ICEBERG_STRATEGY = 2'b10;
  parameter VWAP_STRATEGY = 2'b11;

  // Order book data structure
  reg [1:0] bid_order_type [0:255];
  reg [1:0] bid_execution_strategy [0:255];
  reg [31:0] bid_price [0:255];
  reg [31:0] bid_quantity [0:255];
  reg [31:0] bid_stop_price [0:255];
  reg [31:0] bid_iceberg_quantity [0:255];

  reg [1:0] ask_order_type [0:255];
  reg [1:0] ask_execution_strategy [0:255];
  reg [31:0] ask_price [0:255];
  reg [31:0] ask_quantity [0:255];
  reg [31:0] ask_stop_price [0:255];
  reg [31:0] ask_iceberg_quantity [0:255];

  reg [7:0] bid_book_size;
  reg [7:0] ask_book_size;

  // Matching engine logic
  always @(posedge clk) begin
    if (!rst_n) begin
      // Reset logic
      bid_book_size <= 0;
      ask_book_size <= 0;
      trade_valid <= 0;
      tcp_tx_valid <= 0;
      s_axis_ready <= 1;
      m_axis_valid <= 0;
    end else begin
      // Process incoming orders
      if (order_valid) begin
        bid_order_type[bid_book_size] <= order_data[1:0];
        bid_execution_strategy[bid_book_size] <= order_data[3:2];
        bid_price[bid_book_size] <= order_data[11:4];
        bid_quantity[bid_book_size] <= order_data[19:12];
        bid_stop_price[bid_book_size] <= order_data[27:20];
        bid_iceberg_quantity[bid_book_size] <= order_data[31:28];
        
        case (order_data[1:0])
          LIMIT_ORDER: begin
            // Process limit order
            if (order_data[0]) begin
              // Buy order
              bid_book_size <= bid_book_size + 1;
            end else begin
              // Sell order
              ask_book_size <= ask_book_size + 1;
            end
          end
          MARKET_ORDER: begin
            // Process market order
            if (order_data[0]) begin
              // Buy order
              if (ask_book_size > 0) begin
                // Match with the best available sell order
                trade_data <= {ask_price[ask_book_size - 1], ask_quantity[ask_book_size - 1]};
                trade_valid <= 1;
                ask_book_size <= ask_book_size - 1;
              end
            end else begin
              // Sell order
              if (bid_book_size > 0) begin
                // Match with the best available buy order
                trade_data <= {bid_price[bid_book_size - 1], bid_quantity[bid_book_size - 1]};
                trade_valid <= 1;
                bid_book_size <= bid_book_size - 1;
              end
            end
          end
          STOP_ORDER: begin
            // Process stop order
            if (order_data[0]) begin
              // Buy stop order
              if (order_data[27:20] <= bid_price[bid_book_size - 1]) begin
                // Stop price triggered, add to bid book
                bid_book_size <= bid_book_size + 1;
              end
            end else begin
              // Sell stop order
              if (order_data[27:20] >= ask_price[ask_book_size - 1]) begin
                // Stop price triggered, add to ask book
                ask_book_size <= ask_book_size + 1;
              end
            end
          end
          TRAILING_STOP_ORDER: begin
            // Process trailing stop order
            if (order_data[0]) begin
              // Buy trailing stop order
              if (order_data[27:20] <= bid_price[bid_book_size - 1]) begin
                // Stop price triggered, add to bid book
                bid_book_size <= bid_book_size + 1;
              end else begin
                // Update stop price based on market movement
                bid_stop_price[bid_book_size] <= bid_price[bid_book_size - 1] - order_data[31:28];
              end
            end else begin
              // Sell trailing stop order
              if (order_data[27:20] >= ask_price[ask_book_size - 1]) begin
                // Stop price triggered, add to ask book
                ask_book_size <= ask_book_size + 1;
              end else begin
                // Update stop price based on market movement
                ask_stop_price[ask_book_size] <= ask_price[ask_book_size - 1] + order_data[31:28];
              end
            end
          end
        endcase
        
        // Apply execution strategies
        case (order_data[3:2])
          AGGRESSIVE_STRATEGY: begin
            // Implement aggressive execution strategy
            // Immediately match the order with the best available price
            if (order_data[1:0] == LIMIT_ORDER) begin
              if (order_data[0] && ask_book_size > 0 && order_data[11:4] >= ask_price[ask_book_size - 1]) begin
                // Aggressive buy order
                trade_data <= {ask_price[ask_book_size - 1], order_data[19:12]};
                trade_valid <= 1;
                ask_book_size <= ask_book_size - 1;
              end else if (!order_data[0] && bid_book_size > 0 && order_data[11:4] <= bid_price[bid_book_size - 1]) begin
                // Aggressive sell order
                trade_data <= {bid_price[bid_book_size - 1], order_data[19:12]};
                trade_valid <= 1;
                bid_book_size <= bid_book_size - 1;
              end
            end
          end
          PASSIVE_STRATEGY: begin
            // Implement passive execution strategy
            // Add the order to the book without immediate execution
            if (order_data[1:0] == LIMIT_ORDER) begin
              if (order_data[0]) begin
                // Passive buy order
                bid_book_size <= bid_book_size + 1;
              end else begin
                // Passive sell order
                ask_book_size <= ask_book_size + 1;
              end
            end
          end
          ICEBERG_STRATEGY: begin
            // Implement iceberg execution strategy
            // Display only a portion of the total order quantity
            if (order_data[1:0] == LIMIT_ORDER) begin
              if (order_data[0]) begin
                // Iceberg buy order
                bid_book_size <= bid_book_size + 1;
                bid_quantity[bid_book_size] <= order_data[31:28];
              end else begin
                // Iceberg sell order
                ask_book_size <= ask_book_size + 1;
                ask_quantity[ask_book_size] <= order_data[31:28];
              end
            end
          end
          VWAP_STRATEGY: begin
            // Implement VWAP execution strategy
            // Execute orders based on the volume-weighted average price
            // TODO: Implement VWAP execution logic
          end
        endcase
      end

      // Perform matching logic
      if (bid_book_size > 0 && ask_book_size > 0) begin
        if (bid_price[bid_book_size - 1] >= ask_price[ask_book_size - 1]) begin
          // Execute trade
          trade_data <= {bid_price[bid_book_size - 1], bid_quantity[bid_book_size - 1]};
          trade_valid <= 1;
          
          // Update order books
          bid_book_size <= bid_book_size - 1;
          ask_book_size <= ask_book_size - 1;
        end else begin
          trade_valid <= 0;
        end
      end else begin
        trade_valid <= 0;
      end
      
      // TCP/IP stack integration
      if (tcp_rx_valid) begin
        // Process incoming TCP data
        case (tcp_rx_data[1:0])
          2'b01: begin
            // New order
            if (tcp_rx_data[0]) begin
              // Buy order
              bid_book_size <= bid_book_size + 1;
            end else begin
              // Sell order
              ask_book_size <= ask_book_size + 1;
            end
          end
          2'b10: begin
            // Cancel order
            // Implement order cancellation logic
            // TODO: Implement order cancellation logic
          end
          // Add more cases for other TCP commands
        endcase
      end

      // Generate outgoing TCP data
      tcp_tx_valid <= 0;
      if (trade_valid) begin
        tcp_tx_data <= {2'b11, trade_data[29:0]};
        tcp_tx_valid <= 1;
      end

      // AXI stream interfaces
      s_axis_ready <= 1;
      m_axis_data <= trade_data;
      m_axis_valid <= trade_valid;
    end
  end

endmodule