import { UscFrameMessageEvent } from './../event/UscFrameMessageEvent';
import { nanoid } from "nanoid"

export class IframeMessageReciver {
    resolves: Map<string, Function> = new Map()
    constructor() {
        globalThis.addEventListener("message", (event) => this.reciveMessage(event), false)
    }

    /**
     * 注册服务处理 
     */
    registerMesssageProcess(type: string, resolve: Function) {
        this.resolves.set(type, resolve)
    }

    /**
     * 接收父页面传递来的消息
     */
    async reciveMessage({ data, source }: MessageEvent) {
        let { requestId, payload } = data
        if (payload !== undefined) {
            let resolve = this.resolves.get(payload.type)
            if (resolve) {
                let result = await resolve(payload.data)
                source?.postMessage({ requestId, payload: result }, { targetOrigin: "*" })
            } else {
                source?.postMessage({ requestId, payload: { success: false, message: "接口未定义:" + payload.type } }, { targetOrigin: "*" })
            }
        }
    }

    /**
     * 向父亲页面上报消息
     */
    async popMessage(type: UscFrameMessageEvent, data: any) {
        let requestId = nanoid()
        if (globalThis.parent !== globalThis.window) {
            globalThis.parent.postMessage({ requestId, payload: { type, data } }, "*")
        }
    }
}