import {Constants} from "../constants";
import {setEditMode} from "../toolbar/EditMode";
import {accessLocalStorage} from "../util/compatibility";
import {setContentTheme} from "./setContentTheme";
import {setTheme} from "./setTheme";

declare global {
    interface Window {
        visualViewport: HTMLElement;
    }
}

export const initUI = (vditor: IVditor) => {
    vditor.element.innerHTML = "";
    vditor.element.classList.add("vditor");
    setTheme(vditor);
    setContentTheme(vditor.options.preview.theme.current, vditor.options.preview.theme.path);
    if (typeof vditor.options.height === "number") {
        vditor.element.style.height = vditor.options.height + "px";
    }
    if (typeof vditor.options.minHeight === "number") {
        vditor.element.style.minHeight = vditor.options.minHeight + "px";
    }
    if (typeof vditor.options.width === "number") {
        vditor.element.style.width = vditor.options.width + "px";
    } else {
        vditor.element.style.width = vditor.options.width;
    }

    vditor.element.appendChild(vditor.toolbar.element);
    vditor.element.appendChild(vditor.bubbleToolbar.element);

    const contentElement = document.createElement("div");
    contentElement.className = "vditor-content";

    if (vditor.options.outline.position === "left") {
        contentElement.appendChild(vditor.outline.element);
    }

    contentElement.appendChild(vditor.wysiwyg.element.parentElement);

    contentElement.appendChild(vditor.sv.element);

    contentElement.appendChild(vditor.ir.element.parentElement);

    contentElement.appendChild(vditor.preview.element);

    if (vditor.toolbar.elements.devtools) {
        contentElement.appendChild(vditor.devtools.element);
    }

    if (vditor.options.outline.position === "right") {
        vditor.outline.element.classList.add("vditor-outline--right");
        contentElement.appendChild(vditor.outline.element);
    }

    if (vditor.upload) {
        contentElement.appendChild(vditor.upload.element);
    }

    if (vditor.options.resize.enable) {
        contentElement.appendChild(vditor.resize.element);
    }

    contentElement.appendChild(vditor.hint.element);

    contentElement.appendChild(vditor.tip.element);

    vditor.element.appendChild(contentElement);

    if (vditor.toolbar.elements.export) {
        // for export pdf
        vditor.element.insertAdjacentHTML("beforeend",
            '<iframe style="width: 100%;height: 0;border: 0"></iframe>');
    }

    setEditMode(vditor, vditor.options.mode, afterRender(vditor, contentElement));

    document.execCommand("DefaultParagraphSeparator", false, "p");

    if (navigator.userAgent.indexOf("iPhone") > -1 && typeof window.visualViewport !== "undefined") {
        // https://github.com/Vanessa219/vditor/issues/379
        let pendingUpdate = false;
        const viewportHandler = (event: Event) => {
            if (pendingUpdate) {
                return;
            }
            pendingUpdate = true;

            requestAnimationFrame(() => {
                pendingUpdate = false;
                const layoutViewport = vditor.toolbar.element;
                layoutViewport.style.transform = "none";
                if (layoutViewport.getBoundingClientRect().top < 0) {
                    layoutViewport.style.transform = `translate(0, ${-layoutViewport.getBoundingClientRect().top}px)`;
                }
            });
        };
        window.visualViewport.addEventListener("scroll", viewportHandler);
        window.visualViewport.addEventListener("resize", viewportHandler);
    }
};

export const setPadding = (vditor: IVditor) => {
    const minPadding = window.innerWidth <= Constants.MOBILE_WIDTH ? 10 : 35;
    if (vditor.wysiwyg.element.parentElement.style.display !== "none") {
        const padding = (vditor.wysiwyg.element.parentElement.clientWidth
            - vditor.options.preview.maxWidth) / 2;
        vditor.wysiwyg.element.style.padding = `10px ${Math.max(minPadding, padding)}px`;
    }

    if (vditor.ir.element.parentElement.style.display !== "none") {
        const padding = (vditor.ir.element.parentElement.clientWidth
            - vditor.options.preview.maxWidth) / 2;
        vditor.ir.element.style.padding = `10px ${Math.max(minPadding, padding)}px`;
    }

    if (vditor.preview.element.style.display !== "block" || vditor.currentMode === "sv") {
        vditor.toolbar.element.style.paddingLeft = Math.max(5,
            parseInt(vditor[vditor.currentMode].element.style.paddingLeft || "0", 10) +
            (vditor.options.outline.position === "left" ? vditor.outline.element.offsetWidth : 0)) + "px";
    }
};

export const setTypewriterPosition = (vditor: IVditor) => {
    if (!vditor.options.typewriterMode) {
        return;
    }
    let height: number = window.innerHeight;
    if (typeof vditor.options.height === "number") {
        height = vditor.options.height;
        if (typeof vditor.options.minHeight === "number") {
            height = Math.max(height, vditor.options.minHeight);
        }
        height = Math.min(window.innerHeight, height);
    }
    if (vditor.element.classList.contains("vditor--fullscreen")) {
        height = window.innerHeight;
    }
    // 由于 Firefox padding-bottom bug，只能使用 :after
    vditor[vditor.currentMode].element.style.setProperty("--editor-bottom",
        ((height - vditor.toolbar.element.offsetHeight) / 2) + "px");
};

const afterRender = (vditor: IVditor, contentElement: HTMLElement) => {
    setTypewriterPosition(vditor);

    window.addEventListener("resize", () => {
        setPadding(vditor);
        setTypewriterPosition(vditor);
    });

    // set default value
    let initValue = accessLocalStorage() && localStorage.getItem(vditor.options.cache.id);
    if (!vditor.options.cache.enable || !initValue) {
        if (vditor.options.value) {
            initValue = vditor.options.value;
        } else if (vditor.originalInnerHTML) {
            initValue = vditor.lute.HTML2Md(vditor.originalInnerHTML);
        } else if (!vditor.options.cache.enable) {
            initValue = "";
        }
    }
    return initValue || "";
};