const getElements = () => {
    let toList = [];
    const ref = window;
    const parentWidth = ref.offsetWidth
    const parentHeight = ref.offsetHeight
    const parentScrollHeight = ref.scrollHeight
    let elements = [];
    elements = document.querySelectorAll('body *')
    toList.splice(0, toList.length);
    for (let el of elements) {
        if (['script'].includes(el.tagName.toLowerCase())) continue
        if (isUnvisible(el)) continue
        toList.push(el)
    }
    toList.forEach((el) => {
        let clientRect = el.getBoundingClientRect()
        let pos = {
            left: clientRect.left + scrollX,
            right: clientRect.right + scrollX,
            top: clientRect.top + scrollY,
            bottom: clientRect.bottom + scrollY,
            width: clientRect.width,
            height: clientRect.height
        }
        const isFixedOrSticky = ['fixed', 'sticky'].includes(
            getComputedStyle(el).position
        )
        if (isFixedOrSticky) {
            pos.left = clientRect.left
            pos.right = clientRect.right
            pos.top = clientRect.top
            pos.bottom = clientRect.bottom
        }
        let biasX = []
        let biasY = []
        if (pos.left < parentWidth / 2) biasX = ['left']
        else biasX = ['right']
        if (pos.left < parentWidth / 2 && pos.right > parentWidth / 2) biasX.push('mid')

        if (pos.top < parentHeight / 2) biasY = ['top']
        else if (pos.top > parentScrollHeight - parentHeight / 2) biasY = ['bottom']
        else biasY = ['scroll']
        if (pos.top < parentHeight / 2 && pos.bottom > parentHeight / 2 && isFixedOrSticky)
            biasY.push('mid')

        el.alisaInfo = {
            elInfo: {
                pos: pos,
                biasX,
                biasY
            },
            parentInfo: {
                width: parentWidth,
                height: parentHeight,
                scrollHeight: parentScrollHeight
            },
            groupLeft: [],
            groupRight: [],
            groupTop: [],
            groupBottom: [],
            groupAxisWidth: [],
            groupAxisHeight: [],
            groupAll: [],
            raceList: [],
            assElement: null,
            assLayoutSimScore: 0,
            assStyleSimScore: 0
        }
    })

    toList.forEach((el) => {
        getSameGroup(el, toList, 'left')
        getSameGroup(el, toList, 'right')
        getSameGroup(el, toList, 'top')
        getSameGroup(el, toList, 'bottom')
        getSameGroup(el, toList, 'axisWidth')
        getSameGroup(el, toList, 'axisHeight')
    })
    toList.forEach((el) => {
        getSameRace(el, toList)
    })

    return toList;
}

const isUnvisible = (el) => {
    const style = getComputedStyle(el);
    const rect = el.getBoundingClientRect();
    const hidden =
        style.display === 'none' ||
        style.visibility === 'hidden' ||
        style.opacity === '0' || rect.width === 0 ||
        rect.height === 0;
    return hidden;
}

const getSameGroup = (el, elList, direction, offset = 5) => {
    let idx = elList.indexOf(el)
    if (idx < 0) return
    const Direction = direction.slice(0, 1).toUpperCase() + direction.slice(1)
    const isSamePos = (direction, pos1, pos2, offset) => {
        if (['left', 'top', 'right', 'bottom'].includes(direction))
            if (Math.abs(pos1[direction] - pos2[direction]) <= offset) return true
        if (direction == 'axisWidth')
            if (Math.abs(pos1.width / 2 + pos1.left - pos2.width / 2 - pos2.left) <= offset)
                return true
        if (direction == 'axisHeight')
            if (Math.abs(pos1.height / 2 + pos1.top - pos2.height / 2 - pos2.top) <= offset)
                return true
        return false
    }
    elList.forEach((element, i) => {
        if (idx == i) return
        if (
            isSamePos(
                direction,
                el.alisaInfo.elInfo.pos,
                element.alisaInfo.elInfo.pos,
                offset
            )
        ) {
            el.alisaInfo[`group${Direction}`].push(element)
            let itemIndex = el.alisaInfo.groupAll.indexOf(element)
            if (itemIndex < 0) el.alisaInfo.groupAll.push(element)
        }
    })
}

const getSameRace = (el, elList) => {
    let idx = elList.indexOf(el)
    if (idx < 0) return
    const isSameRace = (el1, el2) => {
        const groupAll = el1.alisaInfo.groupAll
        if (groupAll.indexOf(el2) < 0) return false
        if (el1.tagName != el2.tagName) return false
        return el1.className == el2.className
    }
    elList.forEach((element, i) => {
        if (idx == i) return
        if (isSameRace(el, element)) {
            el.alisaInfo.raceList.push(element)
        }
    })
}

const computedRawElementRatio = (offset = 5) => {
    const toList = getElements();
    try {
        let docMargin = parseFloat(
            getComputedStyle(document.body).marginLeft
        )
        let count = 0
        toList.forEach((el) => {
            if (Math.abs(docMargin - el.alisaInfo.elInfo.pos.left) < offset) {
                if (getComputedStyle(el).position === 'static') {
                    count++
                }
            }
        })
        console.log(count / toList.length)
        return count / toList.length
    } catch (e) {
        console.error('Error in getting iframe document margin', e)
        return -1
    }
}

const computedElementNum = () => {
    const toList = getElements();
    let allTargetEls = toList
    let viewedEls = []
    let count = 0
    allTargetEls.forEach((ei) => {
        if (viewedEls.indexOf(ei) < 0) {
            count += 1
            viewedEls.push(ei)
            ei.alisaInfo.raceList.forEach((ri) => {
                viewedEls.push(ri)
            })
        }
    })
    return count
}