#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>

typedef struct personInfo {
	char name[100];
	char phone_num[20];
}personInfo;

typedef struct addressBook {
	personInfo per[1024];
	int size;
}aBook;

aBook abook;

void initaddressBook(aBook* abook) {
	abook->size = 0;
	memset(abook->per, 0, sizeof(abook->per));
}

int menu() {
	printf("-------通讯录-------\n");
	printf("  1.添加联系人     \n");
	printf("  2.查看联系人\n");
	printf("  3.修改联系人\n");
	printf("  4.删除联系人\n");
	printf("  0.退出      \n");
	printf("请输入你的选择:");
	int choice = 0;
	scanf("%d", &choice);
	return choice;
}

void add(aBook* abook) {
	assert(abook != NULL);
	if (abook->size > 1024) {
		printf("新增联系人失败");
		return;
	}
	personInfo person = { 0 };
	printf("请输入联系人的姓名:");
	scanf("%s", person.name);
	printf("请输入联系人的电话:");
	scanf("%s", person.phone_num);
	abook->per[abook->size] = person;
	abook->size++;
	printf("新增联系人完成\n");
}

void show(aBook* abook ) {
	//这里最好用指针表示元素，
	assert(abook != NULL);
	for (int i = 0; i < abook->size; i++) {
		personInfo* p = &abook->per[i];
		printf("%d %s  %s\n",i,p->name,p->phone_num);
	}
}

void modify(aBook* abook) {
	assert(abook != NULL);
	printf("请输入要修改的序号");
	int id = 0;
	scanf("%d", &id);
	if (id < 0 || id >= abook->size) {
		printf("你输入的序号有误");
		return;
	}
	personInfo* p = &abook->per[id];
	char name[100] = {0};
	char num[20] = {0};
	printf("输入*表示该选项不可修改\n");
	printf("请输入新的名字(旧的用户名为%s)",p->name);
	scanf("%s", name);
	if (strcmp(name, "*" ) != 0) {
		strcpy(p->name, name);
	}
	printf("请输入新的手机号(旧的手机号为%s)", p->phone_num);
	scanf("%s", num);
	if (strcmp(num, "*" ) != 0) {
		strcpy(p->phone_num, num);
	}
	printf("修改成功");
}

void drop(aBook* abook) {
	assert(abook != NULL);
	printf("请输入要删除的序号:");
	int todelete = 0;
	scanf("%d", &todelete);
	if (todelete < 0 || todelete >= abook->size) {
		printf("你输入的序号有误");
		return;
	}
	if (todelete == abook->size - 1) {
		abook->size--;
	}
	else {
		abook->per[todelete] = abook->per[abook->size - 1];
		abook->size--;
	}
	printf("删除联系人完成");
}

typedef void(*Func)(aBook*);

void main() {
	initaddressBook(&abook);
	Func funcs[] = { NULL,add,show,modify,drop};
	while (1) {
		int choice = menu();
		if (choice < 0 || choice>sizeof(funcs) / sizeof(funcs[0])) {
			printf("您的输入有误请重新输入");
			continue;
		}
		if (choice == 0) {
			printf("已退出");
			break;
		}
		funcs[choice](&abook);
		system("pause");
		system("cls");
	}
	return 0;
}