import type { Ref } from 'vue'
import { unref, watchEffect } from 'vue'
import { useTimeoutFn } from '/@/hooks/core/useTimeout'

export interface UseModalDragMoveContext {
    draggable: Ref<boolean>
    destroyOnClose: Ref<boolean | undefined> | undefined
    visible: Ref<boolean>
}

export function useModalDragMove(context: UseModalDragMoveContext) {
    const getStyle = (dom: any, attr: any) => {
        return getComputedStyle(dom)[attr]
    }
    const drag = (wrap: any) => {
        if (!wrap) return
        wrap.setAttribute('data-drag', unref(context.draggable))
        const dialogHeaderEl = wrap.querySelector('.ant-modal-header')
        const dragDom = wrap.querySelector('.ant-modal')

        if (!dialogHeaderEl || !dragDom || !unref(context.draggable)) return

        dialogHeaderEl.style.cursor = 'move'

        dialogHeaderEl.onmousedown = (e: any) => {
            if (!e) return
            // 鼠标按下，计算当前元素距离可视区的距离
            const disX = e.clientX
            const disY = e.clientY
            const screenWidth = document.body.clientWidth // body当前宽度
            const screenHeight = document.documentElement.clientHeight // 可见区域高度(应为body高度，可某些环境下无法获取)

            const dragDomWidth = dragDom.offsetWidth // 对话框宽度
            const dragDomheight = dragDom.offsetHeight // 对话框高度

            const minDragDomLeft = dragDom.offsetLeft

            const maxDragDomLeft = screenWidth - dragDom.offsetLeft - dragDomWidth
            const minDragDomTop = dragDom.offsetTop
            const maxDragDomTop = screenHeight - dragDom.offsetTop - dragDomheight
            // 获取到的值带px 正则匹配替换
            const domLeft = getStyle(dragDom, 'left')
            const domTop = getStyle(dragDom, 'top')
            let styL = +domLeft
            let styT = +domTop

            // 注意在ie中 第一次获取到的值为组件自带50% 移动之后赋值为px
            if (domLeft.includes('%')) {
                styL = +document.body.clientWidth * (+domLeft.replace(/%/g, '') / 100)
                styT = +document.body.clientHeight * (+domTop.replace(/%/g, '') / 100)
            } else {
                styL = +domLeft.replace(/px/g, '')
                styT = +domTop.replace(/px/g, '')
            }

            document.onmousemove = function (e) {
                // 通过事件委托，计算移动的距离
                let left = e.clientX - disX
                let top = e.clientY - disY

                // 边界处理
                if (-left > minDragDomLeft) {
                    left = -minDragDomLeft
                } else if (left > maxDragDomLeft) {
                    left = maxDragDomLeft
                }

                if (-top > minDragDomTop) {
                    top = -minDragDomTop
                } else if (top > maxDragDomTop) {
                    top = maxDragDomTop
                }

                // 移动当前元素
                dragDom.style.cssText += `;left:${left + styL}px;top:${top + styT}px;`
            }

            document.onmouseup = () => {
                document.onmousemove = null
                document.onmouseup = null
            }
        }
    }

    const handleDrag = () => {
        const dragWraps = document.querySelectorAll('.ant-modal-wrap')
        for (const wrap of Array.from(dragWraps)) {
            if (!wrap) continue
            const display = getStyle(wrap, 'display')
            const draggable = wrap.getAttribute('data-drag')
            if (display !== 'none') {
                // 拖拽位置
                if (draggable === null || unref(context.destroyOnClose)) {
                    drag(wrap)
                }
            }
        }
    }

    watchEffect(() => {
        if (!unref(context.visible) || !unref(context.draggable)) {
            return
        }
        useTimeoutFn(() => {
            handleDrag()
        }, 30)
    })
}
