// 适应度评估器 - 评估CA规则的多种适应度指标
module fitness_evaluator #(
    parameter GRID_W = 16,
    parameter GRID_H = 16,
    parameter STEPS = 100
)(
    input  wire             clk,
    input  wire             rst_n,
    input  wire [7:0]       rule,
    input  wire             start,
    output wire [31:0]      fitness_survival,  // 存活步数
    output wire [31:0]      fitness_diversity,  // 图案多样性
    output wire [31:0]      fitness_complexity,  // 结构复杂度
    output wire             done
);
    // 运行CA并收集统计信息
    reg [GRID_W*GRID_H-1:0] ca_state;
    reg [31:0] step_cnt;
    reg [31:0] pop_history [0:STEPS-1];
    reg running;
    
    always @(posedge clk or negedge rst_n) begin
        if (!rst_n) begin
            running <= 1'b0;
            step_cnt <= 32'd0;
        end else if (start && !running) begin
            running <= 1'b1;
            step_cnt <= 32'd0;
            ca_state <= (1 << (GRID_W*GRID_H/2));
        end else if (running) begin
            // 简化的CA步进
            pop_history[step_cnt] <= 32'd0; // 种群计数
            step_cnt <= step_cnt + 32'd1;
            if (step_cnt >= STEPS - 1) running <= 1'b0;
        end
    end
    
    assign fitness_survival = step_cnt;
    assign fitness_diversity = 32'd0;
    assign fitness_complexity = 32'd0;
    assign done = !running && (step_cnt > 0);
endmodule