/*
 * Click nbfs://nbhost/SystemFileSystem/Templates/Licenses/license-default.txt to change this license
 * Click nbfs://nbhost/SystemFileSystem/Templates/Classes/Class.java to edit this template
 */

package com.example.web;

import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.springframework.web.bind.annotation.DeleteMapping;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.PutMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import io.swagger.v3.oas.annotations.Operation;
import io.swagger.v3.oas.annotations.Parameter;
import io.swagger.v3.oas.annotations.tags.Tag;

/**
 *
 * @author Archer
 */
@Tag(name = "用户管理", description = "用户管理API")
@RestController
@RequestMapping(value = "/users")     // 通过这里配置使下面的映射都在/users下
public class UserController {

    // 创建线程安全的Map，模拟users信息的存储
    static Map<Long, User> users = Collections.synchronizedMap(new HashMap<>());

    /**
     * 处理"/users/"的GET请求，用来获取用户列表
     *
     * @return
     */
    @Operation(summary = "获取用户列表", description = "获取用户列表")
    @GetMapping("/")
    public List<User> getUserList() {
        // 还可以通过@RequestParam从页面中传递参数来进行查询条件或者翻页信息的传递
        List<User> r = new ArrayList<>(users.values());
        return r;
    }

    /**
     * 处理"/users/"的POST请求，用来创建User
     *
     * @param user
     * @return
     */
    @Operation(summary = "创建用户", description = "根据user对象创建用户")
    @PostMapping("/")
    public String postUser(@RequestBody User user) {
        // @RequestBody注解用来绑定通过http请求中application/json类型上传的数据
        users.put(user.getId(), user);
        return "success";
    }

    /**
     * 处理"/users/{id}"的GET请求，用来获取url中id值的User信息
     *
     * @param id
     * @return
     */
    @Operation(summary = "获取用户详细信息", description = "根据url的id来获取用户详细信息")
    @GetMapping("/{id}")
    public User getUser(@PathVariable Long id) {
        // url中的id可通过@PathVariable绑定到函数的参数中
        return users.get(id);
    }

    /**
     * 处理"/users/{id}"的PUT请求，用来更新User信息
     *
     * @param id
     * @param user
     * @return
     */
    @Operation(summary = "更新用户详细信息", 
        description = "根据url的id来指定更新对象，并根据传过来的user信息来更新用户详细信息",
        parameters = {
            @Parameter(name = "id", description = "用户ID", required = true),
            @Parameter(name = "user", description = "用户详细信息", required = true)
        })
    @PutMapping("/{id}")
    public String putUser(@PathVariable Long id, @RequestBody User user) {
        User u = users.get(id);
        u.setName(user.getName());
        u.setAge(user.getAge());
        users.put(id, u);
        return "success";
    }

    /**
     * 处理"/users/{id}"的DELETE请求，用来删除User
     *
     * @param id
     * @return
     */
    @Operation(summary = "删除用户", description = "根据url的id来指定删除对象")
    @DeleteMapping("/{id}")
    public String deleteUser(@PathVariable Long id) {
        users.remove(id);
        return "success";
    }

}