import { BuilderNode } from "@kit.ArkUI"
// 导入混编实现的声明式UI构建函数
import { buildButton } from "./builder.ets"

import { INativeButtonContext } from "../interface.uts"
// 定义 buildButton 的参数类型
interface NativeButtonOptions {
    text : string
    onClick : () => void
}

export class NativeButton {
    private $element : UniNativeViewElement;
    private builder : BuilderNode<[NativeButtonOptions]> | null = null
    // 初始化 buildButton 默认参数
    private params : NativeButtonOptions = {
        text: '',
        onClick: () => {
            this.$element.dispatchEvent(new UniNativeViewEvent("customClick", {}))
        }
    }

    constructor(element : UniNativeViewElement) {
        // 绑定 wrapBuilder 函数
        this.builder = element.bindHarmonyWrappedBuilder(wrapBuilder<[NativeButtonOptions]>(buildButton), this.params)
        this.$element = element
        // 绑定当前实例为自定义的controller，方便其他地方通过 element 获取使用
        this.$element.bindHarmonyController(this)
    }

    updateText(text : string) {
        this.params.text = text
        // 调用 builder update 函数来更新 UI
        this.builder?.update(this.params)
    }
}


class NativeButtonContext implements INativeButtonContext {
    private controller : NativeButton
    constructor(element : UniNativeViewElement) {
        // 获取自定义的 controller
        this.controller = element.getHarmonyController<NativeButton>()!
    }
    updateText(text : string) {
        // 调用 controller 来更新文字
        this.controller?.updateText(text)
    }
}
/**
 * 递归查询
 */
function iterateElement(homeElement : UniElement) : UniNativeViewElement | null {
    if ("NATIVE-VIEW" == homeElement.nodeName) {
        return homeElement as UniNativeViewElement
    }
    for (const perChildEle of homeElement.children) {
        let findEle = iterateElement(perChildEle)
        if (findEle != null) {
            return findEle
        }
    }

    return null
}



export function createNativeButtonContext(id : string, ins : ComponentPublicInstance | null = null) : INativeButtonContext | null {
    if (ins == null) {
        const pages = getCurrentPages()
        if (pages.length > 0) {
            const page = pages[pages.length - 1]
            const rootViewElement = page.getElementById(id)
            if (rootViewElement != null) {
                /**
                 * 找到了root节点，递归检索目标 native-view
                 */
                const nativeViewElement = iterateElement(rootViewElement)
                if (nativeViewElement != null) {
                    return new NativeButtonContext(nativeViewElement)
                }
            }
        }
    } else {
        /**
         * 尝试迭代遍历
         */
        if (ins.$el != null) {
            const nativeViewElement = iterateElement(ins.$el as UniElement)
            if (nativeViewElement != null) {
                return new NativeButtonContext(nativeViewElement)
            }
        }
    }

    return null
}