import { Constructor } from "cc"

// 打包之后有问题不支持名称注入
export class SingletonAnnotation {

    private static TypeMap = new Map
    private static initNameMap = new Map<string, { target: any, consParam?: any }>()
    private static initTypeMap = new Map<any, { target: any, consParam?: any }>()
    static setSingleton(_obj?: { type?: any, consParam?: any } | string) {
      
        return function (target: any) {
            // 首字母小写注入
         
            let consParam = _obj['consParam'] || {}

            SingletonAnnotation.initTypeMap.set(target, { target: target, consParam: consParam });
            if (typeof _obj == "string") {
                SingletonAnnotation.initNameMap.set(_obj, { target: target, consParam: consParam });
            }
        }
    }

    private static create(target: any, _obj?: { target?: any, consParam?: any }) {


        let consParam = _obj.consParam
        const instance = new target();
        Object.keys(consParam).forEach((key) => {
            if (typeof key == "string") {
                if (instance.hasOwnProperty(key)) {
                    instance[key] = consParam[key]
                }
            }
        })

        if (SingletonAnnotation.TypeMap.has(target)) {
            console.error("有重复类型被注入")
        }
        SingletonAnnotation.TypeMap.set(target, instance);
        return instance
    }

    static getSingleton(name?: string | Constructor) {
       
        let res: PropertyDecorator = function (target, prop: string, desc?) {
            // 首字母小写注入
            let value: any
            // 是否初始化
            let init;
            return {
                get() {
                    if (!init) {
                        init = true
                        if (!name) {
                            name = prop
                        }
                        value = SingletonAnnotation.getValue(name)
                    }
                    return value
                },
                set(v) { value = v },
            }
        }
        return res

    }

    static getValue(name?: any) {
      
        if (!name) {
            return undefined;

        }
        let value
        if (typeof name != "string") {

            value = this.initObjByType(name);

        } else {
            value = this.initObjByName(name);
        }

        return value
    }

    private static initObjByName(name: string) {

        let v
        let param = SingletonAnnotation.initNameMap.get(name)
        if (param) {

            v = this.initObjByType(param.target)
        }


        return v
    }

    private static initObjByType(name: Constructor) {
        let v = SingletonAnnotation.TypeMap.get(name)
        if (!v) {
            let param = SingletonAnnotation.initTypeMap.get(name)
            if (param) {
                v = SingletonAnnotation.create(param.target, param)
            }

        }
        return v
    }

    static logInfo() {
        console.log("TypeMap", SingletonAnnotation.TypeMap)
        console.log("initTypeMap", SingletonAnnotation.initTypeMap)
    }
}