const { CSS_CLASSES } = window;

const ICON_PATHS = {
    checked: [
        "M7.89561 14.8538L6.30462 13.2629L14.3099 5.25755L15.9009 6.84854L7.89561 14.8538Z",
        "M4.08643 11.0903L5.67742 9.49929L9.4485 13.2704L7.85751 14.8614L4.08643 11.0903Z"
    ],
    unchecked: [
        "M5.13231 6.72963L6.7233 5.13864L14.855 13.2704L13.264 14.8614L5.13231 6.72963Z",
        "M13.2704 5.13864L14.8614 6.72963L6.72963 14.8614L5.13864 13.2704L13.2704 5.13864Z"
    ]
};

const CHECKED_COLOR = "hsl(139, 47.3%, 43.9%)";
const UNCHECKED_COLOR = "hsl(218, 4.6%, 46.9%)";

function createSwitch(
    labelText,
    descriptionText,
    inputId,
    defaultChecked = false,
    onToggle = null
) {
    let isToggling = false;

    const container = document.createElement("div");
    container.className = CSS_CLASSES.container;

    const checkbox = document.createElement("input");
    checkbox.id = inputId;
    checkbox.type = "checkbox";
    checkbox.className = CSS_CLASSES.input;
    checkbox.tabIndex = 0;
    checkbox.checked = defaultChecked;

    const sliderSVG = createSliderSVG(defaultChecked);

    const switchControl = document.createElement("div");
    switchControl.className = `${CSS_CLASSES.switchControl} ${defaultChecked ? CSS_CLASSES.switchControlChecked : ""}`;
    switchControl.style.opacity = "1";
    switchControl.style.backgroundColor = defaultChecked ? CHECKED_COLOR : UNCHECKED_COLOR;
    switchControl.style.cursor = "pointer";
    switchControl.tabIndex = -1;
    switchControl.appendChild(sliderSVG);
    switchControl.appendChild(checkbox);

    const controlWrapper = document.createElement("div");
    controlWrapper.className = CSS_CLASSES.control;
    controlWrapper.appendChild(switchControl);

    const label = document.createElement("label");
    label.htmlFor = inputId;
    label.className = CSS_CLASSES.label;
    label.textContent = labelText;

    const labelRow = document.createElement("div");
    labelRow.className = CSS_CLASSES.labelRow;
    labelRow.appendChild(label);
    labelRow.appendChild(controlWrapper);

    container.appendChild(labelRow);

    if (descriptionText) {
        const description = document.createElement("div");
        description.className = CSS_CLASSES.description;
        description.textContent = descriptionText;

        const noteWrapper = document.createElement("div");
        noteWrapper.className = CSS_CLASSES.note;
        noteWrapper.appendChild(description);
        container.appendChild(noteWrapper);
    }

    const divider = document.createElement("div");
    divider.className = CSS_CLASSES.divider;
    container.appendChild(divider);

    const updateSwitch = (checked) => {
        switchControl.classList.toggle(CSS_CLASSES.switchControlChecked, checked);
        switchControl.style.backgroundColor = checked ? CHECKED_COLOR : UNCHECKED_COLOR;
        sliderSVG.style.left = checked ? "12px" : "-3px";
        updateSVGIcon(sliderSVG, checked);
    };

    const handleToggle = async () => {
        if (isToggling) return;
        isToggling = true;

        const prev = !checkbox.checked;

        if (typeof onToggle === "function") {
            try {
                const ret = await onToggle(checkbox.checked);
                if (ret === false) checkbox.checked = prev;
            } finally {
                isToggling = false;
            }
        } else {
            isToggling = false;
        }

        updateSwitch(checkbox.checked);
    };

    switchControl.addEventListener("click", (e) => {
        if (isToggling) return;
        if (e.target === checkbox) return;

        e.preventDefault();
        e.stopPropagation();
        checkbox.checked = !checkbox.checked;
        checkbox.dispatchEvent(new Event("change", { bubbles: true }));
    });

    checkbox.addEventListener("click", (e) => {
        if (isToggling) {
            e.stopPropagation();
            e.preventDefault();
            return;
        }
    });

    checkbox.addEventListener("change", handleToggle);

    return container;
}

function createSliderSVG(isChecked) {
    const svg = document.createElementNS("http://www.w3.org/2000/svg", "svg");
    svg.setAttribute("class", CSS_CLASSES.slider);
    svg.setAttribute("viewBox", "0 0 28 20");
    svg.setAttribute("preserveAspectRatio", "xMinYMid meet");
    svg.style.left = isChecked ? "12px" : "-3px";
    svg.style.position = "absolute";
    svg.style.transition = "left 0.2s";

    const circle = document.createElementNS("http://www.w3.org/2000/svg", "rect");
    circle.setAttribute("fill", "white");
    circle.setAttribute("x", "4");
    circle.setAttribute("y", "0");
    circle.setAttribute("height", "20");
    circle.setAttribute("width", "20");
    circle.setAttribute("rx", "10");
    svg.appendChild(circle);

    const icon = document.createElementNS("http://www.w3.org/2000/svg", "svg");
    icon.setAttribute("viewBox", "0 0 20 20");
    icon.setAttribute("fill", "none");

    const color = isChecked ? CHECKED_COLOR : UNCHECKED_COLOR;
    
    if (isChecked) {
        const checkPaths = [
            "M7.89561 14.8538L6.30462 13.2629L14.3099 5.25755L15.9009 6.84854L7.89561 14.8538Z",
            "M4.08643 11.0903L5.67742 9.49929L9.4485 13.2704L7.85751 14.8614L4.08643 11.0903Z"
        ];
        checkPaths.forEach(d => {
            const path = document.createElementNS("http://www.w3.org/2000/svg", "path");
            path.setAttribute("fill", color);
            path.setAttribute("d", d);
            icon.appendChild(path);
        });
    } else {
        const xPaths = [
            "M5.13231 6.72963L6.7233 5.13864L14.855 13.2704L13.264 14.8614L5.13231 6.72963Z",
            "M13.2704 5.13864L14.8614 6.72963L6.72963 14.8614L5.13864 13.2704L13.2704 5.13864Z"
        ];
        xPaths.forEach(d => {
            const path = document.createElementNS("http://www.w3.org/2000/svg", "path");
            path.setAttribute("fill", color);
            path.setAttribute("d", d);
            icon.appendChild(path);
        });
    }

    svg.appendChild(icon);
    return svg;
}

function createSVGIcon(parentSVG, isChecked) {
    const color = isChecked ? CHECKED_COLOR : UNCHECKED_COLOR;
    const paths = ICON_PATHS[isChecked ? "checked" : "unchecked"];

    const icon = document.createElementNS("http://www.w3.org/2000/svg", "svg");
    icon.setAttribute("viewBox", "0 0 20 20");
    icon.setAttribute("fill", "none");

    paths.forEach(d => {
        const path = document.createElementNS("http://www.w3.org/2000/svg", "path");
        path.setAttribute("fill", color);
        path.setAttribute("d", d);
        icon.appendChild(path);
    });

    parentSVG.appendChild(icon);
}

function updateSVGIcon(sliderSVG, isChecked) {
    const oldIcon = sliderSVG.querySelector("svg svg");
    if (oldIcon) {
        oldIcon.remove();
    }
    createSVGIcon(sliderSVG, isChecked);
}