#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <pthread.h>

#define MAX_CONFIG_SIZE 1024

// 配置項結構體
typedef struct {
    char* key; // 配置項鍵
    char* value; // 配置項值
} ConfigItem;

// 配置管理器結構體
typedef struct {
    ConfigItem* items; // 配置項數(shù)組
    int count; // 配置項數(shù)量
    pthread_mutex_t lock; // 互斥鎖
} ConfigManager;

// 配置管理器單例結構體
typedef struct {
    ConfigManager* manager; // 配置管理器指針
} ConfigManagerSingleton;

static ConfigManagerSingleton* instance = NULL; // 配置管理器單例對象指針

// 讀取配置文件函數(shù)
void read_config_file(const char* filename) {
    ConfigManager* manager = instance->manager;
    FILE* file = fopen(filename, "r");
    if (file == NULL) {
        return;
    }
    char line[MAX_CONFIG_SIZE];
    while (fgets(line, sizeof(line), file) != NULL) {
        char* key = strtok(line, "=");
        char* value = strtok(NULL, "\n");
        if (key != NULL && value != NULL) {
            ConfigItem item;
            item.key = strdup(key);
            item.value = strdup(value);
            pthread_mutex_lock(&manager->lock);
            manager->items[manager->count++] = item;
            pthread_mutex_unlock(&manager->lock);
        }
    }
    fclose(file);
}

// 獲取配置項值函數(shù)
const char* get_config_value(const char* key) {
    ConfigManager* manager = instance->manager;
    for (int i = 0; i < manager->count; i++) {
        if (strcmp(manager->items[i].key, key) == 0) {
            return manager->items[i].value;
        }
    }
    return NULL;
}

// 獲取配置管理器單例對象函數(shù)
ConfigManager* get_config_manager_instance() {
    if (instance == NULL) {
        instance = (ConfigManagerSingleton*)malloc(sizeof(ConfigManagerSingleton));
        instance->manager = (ConfigManager*)malloc(sizeof(ConfigManager));
        instance->manager->items = (ConfigItem*)malloc(sizeof(ConfigItem) * MAX_CONFIG_SIZE);
        instance->manager->count = 0;
        pthread_mutex_init(&instance->manager->lock, NULL);
        read_config_file("config.txt");
    }
    return instance->manager;
}

int main() {
    ConfigManager* manager = get_config_manager_instance(); // 獲取配置管理器單例對象
    const char* value = get_config_value("key1"); // 獲取配置項值
    if (value != NULL) {
        printf("key1=%s\n", value);
    }
    pthread_mutex_destroy(&manager->lock); // 銷毀互斥鎖
    free(manager->items); // 釋放配置項數(shù)組內存
    free(manager); // 釋放配置管理器內存
    free(instance); // 釋放配置管理器單例對象內存
    return 0;
}