/**
 * 该文件用于匹配login.html
 * 使用该.c文件可实现从名为router的数据库中
 * 查询存有登录名及密码的users表
 */

#include <cjson/cJSON.h>
#include <fcntl.h>
#include <mysql/mysql.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>

int main() {
    // 连接到 MySQL 数据库
    MYSQL *conn;
    MYSQL_RES *res;
    MYSQL_ROW row;

    conn = mysql_init(NULL);
    if (conn == NULL) {
        fprintf(stderr, "mysql_init() failed\n");
        exit(1);
    }

    if (mysql_real_connect(conn, "localhost", "root", "root", "router", 3306,
                           NULL, 0) == NULL) {
        fprintf(stderr, "mysql_real_connect() failed\n");
        mysql_close(conn);
        exit(1);
    }

    // 获取前端传递的 JSON 数据
    char request_data[128] = "";
    fgets(request_data, 128, stdin);

    // 解析 JSON 数据
    cJSON *p = cJSON_Parse(request_data);
    if (p == NULL) {
        fprintf(stderr, "Error parsing JSON data\n");
        mysql_close(conn);
        return 1;
    }

    // 获取用户名和密码
    cJSON *user = cJSON_GetObjectItemCaseSensitive(p, "name");
    cJSON *pwd = cJSON_GetObjectItemCaseSensitive(p, "pwd");

    if (user == NULL || pwd == NULL || !cJSON_IsString(user) ||
        !cJSON_IsString(pwd)) {
        fprintf(stderr,
                "Error getting username and/or password from JSON data\n");
        cJSON_Delete(p);
        mysql_close(conn);
        return 1;
    }

    char *username_from_frontend = user->valuestring;
    char *password_from_frontend = pwd->valuestring;

    // 构建查询语句
    char query[1000];
    sprintf(query, "SELECT * FROM users WHERE username='%s' AND password='%s'",
            username_from_frontend, password_from_frontend);

    if (mysql_query(conn, query)) {
        fprintf(stderr, "SELECT query failed. Error: %s\n", mysql_error(conn));
        cJSON_Delete(p);
        mysql_close(conn);
        return 1;
    }

    res = mysql_store_result(conn);
    if (res == NULL) {
        fprintf(stderr, "mysql_store_result() failed\n");
        cJSON_Delete(p);
        mysql_close(conn);
        return 1;
    }

    cJSON *result_json = cJSON_CreateObject();

    if ((row = mysql_fetch_row(res))) {
        cJSON_AddNumberToObject(result_json, "code", 0);
        cJSON_AddStringToObject(result_json, "nickname", "admin");
    } else {
        cJSON_AddNumberToObject(result_json, "code", 1);
        cJSON_AddStringToObject(result_json, "msg", "用户名或密码错误");
    }

    char *result_json_string = cJSON_Print(result_json);

    // 输出 JSON 结果
    printf("content-type: application/json;charset=utf-8\r\n");
    printf("\r\n");
    printf("%s\n", result_json_string);

    free(result_json_string);
    cJSON_Delete(result_json);
    cJSON_Delete(p);
    mysql_free_result(res);
    mysql_close(conn);

    return 0;
}