import {hasClosestBlock, hasClosestByAttribute} from "../protyle/util/hasClosest";
import {getEditorRange} from "../protyle/util/selection";

export const bgFade = (element: Element) => {
    element.classList.add("protyle-wysiwyg--hl");
    setTimeout(function () {
        element.classList.remove("protyle-wysiwyg--hl");
    }, 1024);
};

export const highlightById = (protyle: IProtyle, id: string, top = false) => {
    let nodeElement: HTMLElement;
    const protyleElement = protyle.wysiwyg.element;
    if (!protyle.preview.element.classList.contains("fn__none")) {
        // 预览定位
        nodeElement = document.getElementById(id);
        if (nodeElement) {
            protyle.preview.element.scrollTop = nodeElement.offsetTop;
            bgFade(nodeElement);
        }
        return undefined;
    }

    Array.from(protyleElement.querySelectorAll(`[data-node-id="${id}"]`)).find((item: HTMLElement) => {
        if (!hasClosestByAttribute(item, "data-type", "block-render", true)) {
            nodeElement = item;
            return true;
        }
    });
    if (nodeElement) {
        scrollCenter(protyle, nodeElement, top);
        bgFade(nodeElement);
        return nodeElement;// 仅配合前进后退使用
    }
    if (id === protyle.block.rootID && protyle.options.render.title && protyle.title.editElement) {
        bgFade(protyle.title.editElement);
        return protyle.title.editElement;
    }
};

export const scrollCenter = (protyle: IProtyle, nodeElement?: Element, top = false, behavior: ScrollBehavior = "auto") => {
    if (!protyle.disabled && !top && getSelection().rangeCount > 0) {
        const range = getSelection().getRangeAt(0);
        const blockElement = hasClosestBlock(range.startContainer);
        if (blockElement) {
            // https://github.com/siyuan-note/siyuan/issues/10769
            if (blockElement.classList.contains("code-block")) {
                const brElement = document.createElement("br");
                range.insertNode(brElement);
                brElement.scrollIntoView({block: "center", behavior});
                brElement.remove();
                return;
            }
            // undo 时禁止数据库滚动
            if (blockElement.classList.contains("av") && blockElement.dataset.render === "true" &&
                (blockElement.querySelector(".av__row--header").getAttribute("style")?.indexOf("transform") > -1 || blockElement.querySelector(".av__row--footer").getAttribute("style")?.indexOf("transform") > -1)) {
                return;
            }

            const br2Element = document.createElement("br");
            range.insertNode(br2Element);
            const editorElement = protyle.contentElement;
            const cursorTop = br2Element.getBoundingClientRect().top - editorElement.getBoundingClientRect().top;
            let scrollTop = 0;
            if (cursorTop < 0) {
                scrollTop = editorElement.scrollTop + cursorTop;
            } else if (cursorTop > editorElement.clientHeight - 74) {   // 74 = 移动端底部 + 段落块高度
                scrollTop = editorElement.scrollTop + (cursorTop + 74 - editorElement.clientHeight);
            }
            if (scrollTop !== 0) {
                editorElement.scroll({top: scrollTop, behavior});
            }
            br2Element.remove();
            return;
        }
    }

    if (!nodeElement &&
        // https://github.com/siyuan-note/siyuan/issues/11175
        document.activeElement?.tagName !== "TEXTAREA" && document.activeElement?.tagName !== "INPUT") {
        nodeElement = hasClosestBlock(getEditorRange(protyle.wysiwyg.element).startContainer) as HTMLElement;
    }
    if (!nodeElement) {
        return;
    }

    let offsetTop = 0;
    let parentNodeElement = nodeElement;
    while (parentNodeElement && !parentNodeElement.classList.contains("protyle-wysiwyg")) {
        offsetTop += (parentNodeElement as HTMLElement).offsetTop;
        parentNodeElement = parentNodeElement.parentElement;
    }
    let contentTop = 0;
    let topElement = protyle.element.firstElementChild;
    while (topElement && !topElement.classList.contains("protyle-content")) {
        contentTop += topElement.clientHeight;
        topElement = topElement.nextElementSibling;
    }
    if (top) {
        protyle.contentElement.scroll({top: offsetTop - contentTop, behavior});
        return;
    }
    if (protyle.contentElement.scrollTop > offsetTop - 32) {
        protyle.contentElement.scroll({top: offsetTop - contentTop, behavior});
    } else if (protyle.contentElement.scrollTop + protyle.contentElement.clientHeight < offsetTop + nodeElement.clientHeight - contentTop) {
        protyle.contentElement.scroll({
            top: offsetTop + nodeElement.clientHeight - contentTop - protyle.contentElement.clientHeight,
            behavior
        });
    }
};