/** overlay 的最小 DOM adapter：只验证节点/样式契约，不模拟浏览器布局或动画。 */
export function markerTestDocument() {
    class Element {
        constructor(tag) {
            this.tagName = tag
            this.nodeType = 1
            this.children = []
            this.dataset = {}
            this.attributes = {}
            this.className = ''
            this.listeners = new Map()
            this.style = { setProperty(key, value) { this[key] = value } }
            this.classList = { toggle: (name, enabled) => {
                const names = new Set(this.className.split(' ').filter(Boolean))
                if (enabled) names.add(name)
                else names.delete(name)
                this.className = [...names].join(' ')
            } }
        }
        get parentElement() { return this.parentNode }
        get isConnected() { return this.connected === true || Boolean(this.parentNode?.isConnected) }
        appendChild(child) {
            child.parentNode?.removeChild(child)
            child.parentNode = this
            this.children.push(child)
            return child
        }
        removeChild(child) {
            this.children = this.children.filter((item) => item !== child)
            child.parentNode = null
            return child
        }
        remove() { this.parentNode?.removeChild(this) }
        set innerHTML(value) {
            // overlay 的水滴 SVG 占位；不解析路径、不伪造像素证据。
            this.html = value
            this.firstChild = new Element('svg')
            this.firstChild.inner = new Element('image')
        }
        setAttribute(key, value) { this.attributes[key] = value }
        querySelector(selector) { return selector === '[data-marker-overlay-inner]' ? this.inner : null }
        addEventListener(type, fn) {
            const listeners = this.listeners.get(type) || []
            this.listeners.set(type, [...listeners, fn])
        }
        removeEventListener(type, fn) {
            this.listeners.set(type, (this.listeners.get(type) || []).filter((item) => item !== fn))
        }
        contains(node) { return node === this || this.children.some((child) => child.contains(node)) }
        closest(selector) {
            return this.className.split(' ').includes(selector.slice(1)) ? this : this.parentNode?.closest(selector)
        }
        getBoundingClientRect() { return { left: 0, top: 0, width: 1000, height: 800 } }
        nodes() { return [this, ...this.children.flatMap((child) => child.nodes())] }
        fire(type, target) {
            for (const fn of this.listeners.get(type) || []) fn({ target, clientX: 100, clientY: 200, stopPropagation() {} })
        }
    }
    const head = new Element('head')
    const host = new Element('main')
    head.connected = host.connected = true
    return {
        head, host,
        createElement: (tag) => new Element(tag),
        getElementById: (id) => head.nodes().find((node) => node.id === id) || null,
    }
}