/*
 * =====================================================================================
 *
 *       Filename:  patch_evaluator.c
 *
 *    Description:  A simple program to simulate the evaluation process for a 
 *                  kernel development request, based on established principles.
 *
 *        Version:  1.0
 *        Created:  2025-08-15
 *       Revision:  none
 *       Compiler:  gcc
 *
 *         Author:  Linus Torvalds (Persona)
 *   Organization:  The Linux Foundation
 *
 * =====================================================================================
 */

#include <stdio.h>
#include <stdbool.h>
#include <string.h>

// "Good taste" means simple, clear data structures.
// No over-engineering.

// --- DATA STRUCTURES ---

// Represents the initial triage of a request.
typedef struct {
    bool is_real_problem;
    bool is_simplest_way;
    bool breaks_anything; // To be determined
} InitialCheck;

// Represents the final analysis and proposed solution.
typedef struct {
    const char* core_judgment;
    const char* insight_data_structure;
    const char* insight_complexity;
    const char* insight_risk;
    const char* solution_step_1;
    const char* solution_step_2;
    const char* solution_step_3;
    const char* solution_step_4;
} FinalDecision;

// Represents a code review.
typedef enum {
    TASTE_GOOD,
    TASTE_MEH,
    TASTE_GARBAGE
} TasteScore;

typedef struct {
    TasteScore score;
    const char* fatal_flaw;
    const char* improvement_direction;
} CodeReview;

// The main object representing the request.
typedef struct {
    const char* id;
    InitialCheck initial_check;
    FinalDecision final_decision;
    CodeReview code_review;
} KernelRequest;


// --- FUNCTIONS ---

/*
 * Fills the initial check data. In a real scenario, this would involve
 * mailing list discussions. Here, we just populate it.
 * Pragmatism: Solve the problem, don't just talk about it.
 */
void perform_initial_check(KernelRequest* req)
{
    printf("--- Linus's 3 Initial Questions for Request '%s' ---\n", req->id);
    
    // 1. Is this a real problem or imaginary?
    req->initial_check.is_real_problem = true;
    printf("1. Is this a real problem or imaginary? -> Assumed real.\n");

    // 2. Is there a simpler way?
    req->initial_check.is_simplest_way = true; // For now.
    printf("2. Is there a simpler way? -> Assumed this is the initial proposal.\n");

    // 3. Will it break anything?
    req->initial_check.breaks_anything = false; // To be determined
    printf("3. Will it break anything? -> To be determined by analysis.\n");
    
    printf("--- Initial check passed. Proceeding with analysis. ---\n\n");
}

/*
 * Fills the final decision data. This is the core of the technical evaluation.
 * Keep functions short. This one just populates a struct.
 */
void make_final_decision(KernelRequest* req)
{
    req->final_decision.core_judgment = "✅ 值得做: It addresses a documented performance bottleneck in file I/O.";
    
    req->final_decision.insight_data_structure = "The key is the VFS inode cache. It's currently contended.";
    req->final_decision.insight_complexity = "The proposed locking scheme is too complex. Can be simplified.";
    req->final_decision.insight_risk = "High risk of deadlocks if not implemented carefully. Race conditions in user-space file access.";

    req->final_decision.solution_step_1 = "Simplify the data structure: Use a per-CPU cache line to reduce lock contention.";
    req->final_decision.solution_step_2 = "Eliminate special cases for read/write paths.";
    req->final_decision.solution_step_3 = "Implement with a simple, coarse-grained lock first. Prove it works, then optimize.";
    req->final_decision.solution_step_4 = "Ensure zero user-space API changes."; // "Never break userspace"
}

/*
 * Simulates a code review.
 * Bad code is obvious. Good code is boring.
 */
void perform_code_review(KernelRequest* req)
{
    req->code_review.score = TASTE_GARBAGE;
    req->code_review.fatal_flaw = "You have more than 3 levels of indentation. Your logic is broken.";
    req->code_review.improvement_direction = "\"Your data structure is wrong. Refactor the data to eliminate the conditions that lead to this nesting. This 20-line function should be 5 lines.\"";
}


// --- MAIN EXECUTION ---

int main(void)
{
    // Initialize the request based on the prompt.
    KernelRequest req001 = { .id = "REQ-001" };

    // Step 1: Perform the initial check.
    perform_initial_check(&req001);

    // Step 2: Make the final decision and plan.
    make_final_decision(&req001);

    // Step 3: Review the (hypothetical) submitted code.
    perform_code_review(&req001);

    // --- Print the final results ---

    printf("==================================================\n");
    printf("            LINUS'S FINAL DECISION\n");
    printf("==================================================\n");
    printf("【核心判断】\n%s\n\n", req001.final_decision.core_judgment);
    printf("【关键洞察】\n");
    printf("- 数据结构: %s\n", req001.final_decision.insight_data_structure);
    printf("- 复杂度: %s\n", req001.final_decision.insight_complexity);
    printf("- 风险点: %s\n\n", req001.final_decision.insight_risk);
    printf("【Linus式方案】\n");
    printf("1. %s\n", req001.final_decision.solution_step_1);
    printf("2. %s\n", req001.final_decision.solution_step_2);
    printf("3. %s\n", req001.final_decision.solution_step_3);
    printf("4. %s\n", req001.final_decision.solution_step_4);
    printf("==================================================\n\n");

    printf("==================================================\n");
    printf("            LINUS'S CODE REVIEW\n");
    printf("==================================================\n");
    printf("【品味评分】\n");
    if (req001.code_review.score == TASTE_GARBAGE) {
        printf("🔴 垃圾\n\n");
    }
    printf("【致命问题】\n- %s\n\n", req001.code_review.fatal_flaw);
    printf("【改进方向】\n%s\n", req001.code_review.improvement_direction);
    printf("==================================================\n");

    return 0;
}