const flag = ref(false)
effect(()=>{
    document.body.innerHTML = flag.value ? 30:'姜文'
});
setTimeout(()=>{
    flag.value = true
},1000);

function createRef(rawValue, shallow) {
    return new RefImpl(rawValue,shallow); // 将值进行装包
}
// 将原始类型包装成对象, 同时也可以包装对象 进行深层代理
export function ref(value) {
    return createRef(value, false);
}
// 创建浅ref 不会进行深层代理
export function shallowRef(value) {
    return createRef(value, true);
}

function toReactive(value) { // 将对象转化为响应式的
    return isObject(value) ? reactive(value) : value
}
class RefImpl {
    public _value;
    public dep;
    public __v_isRef = true;
    constructor(public rawValue, public _shallow) {
        this._value = _shallow ? rawValue : toReactive(rawValue); // 浅ref不需要再次代理
    }
    get value(){
        if(activeEffect){
            trackEffects(this.dep || (this.dep = new Set)); // 收集依赖
        }
        return this._value;
    }
    set value(newVal){
        if(newVal !== this.rawValue){
            this.rawValue = newVal;
            this._value = this._shallow ? newVal : toReactive(newVal);
            triggerEffects(this.dep); // 触发更新
        }
    }
}

const state = reactive({name: 'jw', age: 30 })
let person = {...state}
effect(()=>{
    document.body.innerHTML = person.name +'今年' + person.age +'岁了'
})
setTimeout(()=>{
    person.age = 31;
},1000)

class ObjectRefImpl {
    public __v_isRef = true
    constructor(public _object, public _key) { }
    get value() {
        return this._object[this._key];
    }
    set value(newVal) {
        this._object[this._key] = newVal;
    }
}
export function toRef(object, key) { // 将响应式对象中的某个属性转化成ref
    return new ObjectRefImpl(object, key);
}
export function toRefs(object) { // 将所有的属性转换成ref
    const ret = Array.isArray(object) ? new Array(object.length) : {};
    for (const key in object) {
        ret[key] = toRef(object, key);
    }
    return ret;
}

let person = {...toRefs(state)}; // 解构的时候将所有的属性都转换成ref即可
effect(()=>{
    document.body.innerHTML = person.name.value +'今年' + person.age.value +'岁了'
})
setTimeout(()=>{
    person.age.value = 31;
},1000)

let person = proxyRefs({...toRefs(state)})
effect(()=>{
    document.body.innerHTML = person.name +'今年' + person.age +'岁了'
})
setTimeout(()=>{
    person.age = 31;
},1000)

export function proxyRefs(objectWithRefs){ // 代理的思想，如果是ref 则取ref.value
    return new Proxy(objectWithRefs,{
        get(target,key,receiver){
            let v = Reflect.get(target,key,receiver);
            return v.__v_isRef? v.value:v; 
        },
        set(target,key,value,receiver){ // 设置的时候如果是ref,则给ref.value赋值
            const oldValue = target[key];
            if(oldValue.__v_isRef){
                oldValue.value = value;
                return true
            }else{
                return Reflect.set(target,key,value,receiver)
            }
        }
    })
}