path: root/src/js-components/previewBar.ts

/*
Parts of this are inspired from code from VideoSegments, but rewritten and under the LGPLv3 license
https://github.com/videosegments/videosegments/commits/f1e111bdfe231947800c6efdd51f62a4e7fef4d4/segmentsbar/segmentsbar.js
*/

'use strict';

import Config from "../config";
import { ChapterVote } from "../render/ChapterVote";
import { ActionType, Category, SegmentContainer, SponsorHideType, SponsorSourceType, SponsorTime } from "../types";
import { partition } from "../utils/arrayUtils";
import { DEFAULT_CATEGORY, shortCategoryName } from "../utils/categoryUtils";
import { GenericUtils } from "../utils/genericUtils";
import { findValidElement } from "../utils/pageUtils";

const TOOLTIP_VISIBLE_CLASS = 'sponsorCategoryTooltipVisible';
const MIN_CHAPTER_SIZE = 0.003;

export interface PreviewBarSegment {
    segment: [number, number];
    category: Category;
    actionType: ActionType;
    unsubmitted: boolean;
    showLarger: boolean;
    description: string;
    source: SponsorSourceType;
    requiredSegment?: boolean;
}

interface ChapterGroup extends SegmentContainer {
    originalDuration: number;
    actionType: ActionType;
}

class PreviewBar {
    container: HTMLUListElement;
    categoryTooltip?: HTMLDivElement;
    categoryTooltipContainer?: HTMLElement;
    chapterTooltip?: HTMLDivElement;

    parent: HTMLElement;
    onMobileYouTube: boolean;
    onInvidious: boolean;
    progressBar: HTMLElement;

    segments: PreviewBarSegment[] = [];
    existingChapters: PreviewBarSegment[] = [];
    videoDuration = 0;

    // For chapter bar
    hoveredSection: HTMLElement;
    customChaptersBar: HTMLElement;
    chaptersBarSegments: PreviewBarSegment[];
    chapterVote: ChapterVote;
    originalChapterBar: HTMLElement;
    originalChapterBarBlocks: NodeListOf<HTMLElement>;
    chapterMargin: number;
    unfilteredChapterGroups: ChapterGroup[];
    chapterGroups: ChapterGroup[];

    constructor(parent: HTMLElement, onMobileYouTube: boolean, onInvidious: boolean, chapterVote: ChapterVote, test=false) {
        if (test) return;
        this.container = document.createElement('ul');
        this.container.id = 'previewbar';

        this.parent = parent;
        this.onMobileYouTube = onMobileYouTube;
        this.onInvidious = onInvidious;
        this.chapterVote = chapterVote;

        this.updatePageElements();
        this.createElement(parent);
        this.createChapterMutationObservers();

        this.setupHoverText();
    }

    setupHoverText(): void {
        if (this.onMobileYouTube || this.onInvidious) return;

        // delete old ones
        document.querySelectorAll(`.sponsorCategoryTooltip`)
            .forEach((e) => e.remove());

        // Create label placeholder
        this.categoryTooltip = document.createElement("div");
        this.categoryTooltip.className = "ytp-tooltip-title sponsorCategoryTooltip";
        this.chapterTooltip = document.createElement("div");
        this.chapterTooltip.className = "ytp-tooltip-title sponsorCategoryTooltip";

        const tooltipTextWrapper = document.querySelector(".ytp-tooltip-text-wrapper");
        if (!tooltipTextWrapper || !tooltipTextWrapper.parentElement) return;

        // Grab the tooltip from the text wrapper as the tooltip doesn't have its classes on init
        this.categoryTooltipContainer = tooltipTextWrapper.parentElement;
        const titleTooltip = tooltipTextWrapper.querySelector(".ytp-tooltip-title") as HTMLElement;
        if (!this.categoryTooltipContainer || !titleTooltip) return;

        tooltipTextWrapper.insertBefore(this.categoryTooltip, titleTooltip.nextSibling);
        tooltipTextWrapper.insertBefore(this.chapterTooltip, titleTooltip.nextSibling);

        const seekBar = document.querySelector(".ytp-progress-bar-container");
        if (!seekBar) return;

        let mouseOnSeekBar = false;

        seekBar.addEventListener("mouseenter", () => {
            mouseOnSeekBar = true;
        });

        seekBar.addEventListener("mouseleave", () => {
            mouseOnSeekBar = false;
        });

        const observer = new MutationObserver((mutations) => {
            if (!mouseOnSeekBar || !this.categoryTooltip || !this.categoryTooltipContainer) return;

            // If the mutation observed is only for our tooltip text, ignore
            if (mutations.some((mutation) => (mutation.target as HTMLElement).classList.contains("sponsorCategoryTooltip"))) {
                return;
            }

            const tooltipTextElements = tooltipTextWrapper.querySelectorAll(".ytp-tooltip-text");
            let timeInSeconds: number | null = null;
            let noYoutubeChapters = false;

            for (const tooltipTextElement of tooltipTextElements) {
                if (tooltipTextElement.classList.contains('ytp-tooltip-text-no-title')) noYoutubeChapters = true;

                const tooltipText = tooltipTextElement.textContent;
                if (tooltipText === null || tooltipText.length === 0) continue;

                timeInSeconds = GenericUtils.getFormattedTimeToSeconds(tooltipText);

                if (timeInSeconds !== null) break;
            }

            if (timeInSeconds === null) return;

            // Find the segment at that location, using the shortest if multiple found
            const [normalSegments, chapterSegments] = 
                partition(this.segments.filter((s) => s.source !== SponsorSourceType.YouTube), 
                    (segment) => segment.actionType !== ActionType.Chapter);
            let mainSegment = this.getSmallestSegment(timeInSeconds, normalSegments);
            let secondarySegment = this.getSmallestSegment(timeInSeconds, chapterSegments);
            if (mainSegment === null && secondarySegment !== null) {
                mainSegment = secondarySegment;
                secondarySegment = this.getSmallestSegment(timeInSeconds, chapterSegments.filter((s) => s !== secondarySegment));
            }

            if (mainSegment === null && secondarySegment === null) {
                this.categoryTooltipContainer.classList.remove(TOOLTIP_VISIBLE_CLASS);
            } else {
                this.categoryTooltipContainer.classList.add(TOOLTIP_VISIBLE_CLASS);
                if (mainSegment !== null && secondarySegment !== null) {
                    this.categoryTooltipContainer.classList.add("sponsorTwoTooltips");
                } else {
                    this.categoryTooltipContainer.classList.remove("sponsorTwoTooltips");
                }

                this.setTooltipTitle(mainSegment, this.categoryTooltip);
                this.setTooltipTitle(secondarySegment, this.chapterTooltip);

                // Used to prevent overlapping
                this.categoryTooltip.classList.toggle("ytp-tooltip-text-no-title", noYoutubeChapters);
                this.chapterTooltip.classList.toggle("ytp-tooltip-text-no-title", noYoutubeChapters);

                // To prevent offset issue
                this.categoryTooltip.style.right = titleTooltip.style.right;
                this.chapterTooltip.style.right = titleTooltip.style.right;
            }
        });

        observer.observe(tooltipTextWrapper, {
            childList: true,
            subtree: true,
        });
    }

    private setTooltipTitle(segment: PreviewBarSegment, tooltip: HTMLElement): void {
        if (segment) {
            const name = segment.description || shortCategoryName(segment.category);
            if (segment.unsubmitted) {
                tooltip.textContent = chrome.i18n.getMessage("unsubmitted") + " " + name;
            } else {
                tooltip.textContent = name;
            }

            tooltip.style.removeProperty("display");
        } else {
            tooltip.style.display = "none";
        }
    }

    createElement(parent: HTMLElement): void {
        this.parent = parent;

        if (this.onMobileYouTube) {
            if (parent.classList.contains("progress-bar-background")) {
                parent.style.backgroundColor = "rgba(255, 255, 255, 0.3)";
                parent.style.opacity = "1";
            }

            this.container.style.transform = "none";
        } else if (!this.onInvidious) {
            this.container.classList.add("sbNotInvidious");
        }

        // On the seek bar
        this.parent.prepend(this.container);
    }

    clear(): void {
        while (this.container.firstChild) {
            this.container.removeChild(this.container.firstChild);
        }

        if (this.customChaptersBar) this.customChaptersBar.style.display = "none";
        this.originalChapterBar?.style?.removeProperty("display");
        this.chapterVote?.setVisibility(false);

        document.querySelectorAll(`.sponsorBlockChapterBar`).forEach((e) => {
            if (e !== this.customChaptersBar) {
                e.remove();
            }
        });
    }

    set(segments: PreviewBarSegment[], videoDuration: number): void {
        this.segments = segments ?? [];
        this.videoDuration = videoDuration ?? 0;

        this.updatePageElements();
        // Sometimes video duration is inaccurate, pull from accessibility info
        const ariaDuration = parseInt(this.progressBar?.getAttribute('aria-valuemax')) ?? 0;
        if (ariaDuration && Math.abs(ariaDuration - this.videoDuration) > 3) {
            this.videoDuration = ariaDuration;
        }

        this.update();
    }

    private updatePageElements(): void {
        const allProgressBars = document.querySelectorAll('.ytp-progress-bar') as NodeListOf<HTMLElement>;
        this.progressBar = findValidElement(allProgressBars) ?? allProgressBars?.[0];

        if (this.progressBar) {
            const newChapterBar = this.progressBar.querySelector(".ytp-chapters-container:not(.sponsorBlockChapterBar)") as HTMLElement;
            if (this.originalChapterBar !== newChapterBar) {
                // Make sure changes are undone on old bar
                this.originalChapterBar?.style?.removeProperty("display");

                this.originalChapterBar = newChapterBar;
            }
        }
    }

    private update(): void {
        this.clear();
        const chapterChevron = this.getChapterChevron();

        if (!this.segments) {
            chapterChevron?.style?.removeProperty("display");
        }

        this.chapterMargin = 2;
        if (this.originalChapterBar) {
            this.originalChapterBarBlocks = this.originalChapterBar.querySelectorAll(":scope > div") as NodeListOf<HTMLElement>
            this.existingChapters = this.segments.filter((s) => s.source === SponsorSourceType.YouTube).sort((a, b) => a.segment[0] - b.segment[0]);
        
            if (this.existingChapters?.length > 0) {
                const margin = parseFloat(this.originalChapterBarBlocks?.[0]?.style?.marginRight?.replace("px", ""));
                if (margin) this.chapterMargin = margin;
            }
        }

        const sortedSegments = this.segments.sort(({ segment: a }, { segment: b }) => {
            // Sort longer segments before short segments to make shorter segments render later
            return (b[1] - b[0]) - (a[1] - a[0]);
        });
        for (const segment of sortedSegments) {
            const bar = this.createBar(segment);

            this.container.appendChild(bar);
        }

        this.createChaptersBar(this.segments.sort((a, b) => a.segment[0] - b.segment[0]));

        if (chapterChevron) {
            if (this.segments.some((segment) => segment.source === SponsorSourceType.YouTube)) {
                chapterChevron.style.removeProperty("display");
            } else {
                chapterChevron.style.display = "none";
            }
        }
    }

    createBar(barSegment: PreviewBarSegment): HTMLLIElement {
        const { category, unsubmitted, segment, showLarger } = barSegment;

        const bar = document.createElement('li');
        bar.classList.add('previewbar');
        if (barSegment.requiredSegment) bar.classList.add("requiredSegment");
        bar.innerHTML = showLarger ? '&nbsp;&nbsp;' : '&nbsp;';

        const fullCategoryName = (unsubmitted ? 'preview-' : '') + category;
        bar.setAttribute('sponsorblock-category', fullCategoryName);

        bar.style.backgroundColor = Config.config.barTypes[fullCategoryName]?.color;
        if (!this.onMobileYouTube) bar.style.opacity = Config.config.barTypes[fullCategoryName]?.opacity;

        bar.style.position = "absolute";
        const duration = Math.min(segment[1], this.videoDuration) - segment[0];
        if (duration > 0) {
            bar.style.width = `calc(${this.intervalToPercentage(segment[0], segment[1])}${
                this.chapterFilter(barSegment) && segment[1] < this.videoDuration ? ` - ${this.chapterMargin}px` : ''})`;
        }
        
        const time = segment[1] ? Math.min(this.videoDuration, segment[0]) : segment[0];
        bar.style.left = this.timeToPercentage(time);

        return bar;
    }

    createChaptersBar(segments: PreviewBarSegment[]): void {
        if (!this.progressBar || !this.originalChapterBar || this.originalChapterBar.childElementCount <= 0) {
            if (this.originalChapterBar) this.originalChapterBar.style.removeProperty("display");

            // Make sure other video types lose their chapter bar
            document.querySelectorAll(".sponsorBlockChapterBar").forEach((element) => element.remove());
            this.customChaptersBar = null;
            return;
        }

        // Merge overlapping chapters
        this.unfilteredChapterGroups = this.createChapterRenderGroups(segments);

        if (segments.every((segments) => segments.source === SponsorSourceType.YouTube) 
            || (!Config.config.renderSegmentsAsChapters 
                && segments.every((segment) => segment.actionType !== ActionType.Chapter 
                    || segment.source === SponsorSourceType.YouTube))) {
            if (this.customChaptersBar) this.customChaptersBar.style.display = "none";
            this.originalChapterBar.style.removeProperty("display");
            return;
        }

        const filteredSegments = segments?.filter((segment) => this.chapterFilter(segment));
        if (filteredSegments) {
            let groups = this.unfilteredChapterGroups;
            if (filteredSegments.length !== segments.length) {
                groups = this.createChapterRenderGroups(filteredSegments);
            }
            this.chapterGroups = groups.filter((segment) => this.chapterGroupFilter(segment));

            if (groups.length !== this.chapterGroups.length) {
                // Fix missing sections due to filtered segments
                for (let i = 1; i < this.chapterGroups.length; i++) {
                    if (this.chapterGroups[i].segment[0] !== this.chapterGroups[i - 1].segment[1]) {
                        this.chapterGroups[i - 1].segment[1] = this.chapterGroups[i].segment[0]
                    }
                }
            }
        } else {
            this.chapterGroups = this.unfilteredChapterGroups;
        }

        if (!this.chapterGroups || this.chapterGroups.length <= 0) {
            if (this.customChaptersBar) this.customChaptersBar.style.display = "none";
            this.originalChapterBar.style.removeProperty("display");
            return;
        }

        // Create it from cloning
        let createFromScratch = false;
        if (!this.customChaptersBar || !this.progressBar.contains(this.customChaptersBar)) {
            // Clear anything remaining
            document.querySelectorAll(".sponsorBlockChapterBar").forEach((element) => element.remove());

            createFromScratch = true;
            this.customChaptersBar = this.originalChapterBar.cloneNode(true) as HTMLElement;
            this.customChaptersBar.classList.add("sponsorBlockChapterBar");
        }

        this.customChaptersBar.style.display = "none";
        const originalSections = this.customChaptersBar.querySelectorAll(".ytp-chapter-hover-container");
        const originalSection = originalSections[0];

        // For switching to a video with less chapters
        if (originalSections.length > this.chapterGroups.length) {
            for (let i = originalSections.length - 1; i >= this.chapterGroups.length; i--) {
                this.customChaptersBar.removeChild(originalSections[i]);
            }
        }

        // Modify it to have sections for each segment
        for (let i = 0; i < this.chapterGroups.length; i++) {
            const chapter = this.chapterGroups[i].segment;
            let newSection = originalSections[i] as HTMLElement;
            if (!newSection) {
                newSection = originalSection.cloneNode(true) as HTMLElement;

                this.firstTimeSetupChapterSection(newSection);
                this.customChaptersBar.appendChild(newSection);
            } else if (createFromScratch) {
                this.firstTimeSetupChapterSection(newSection);
            }

            this.setupChapterSection(newSection, chapter[0], chapter[1], i !== this.chapterGroups.length - 1);
        }

        // Hide old bar
        this.originalChapterBar.style.display = "none";
        this.customChaptersBar.style.removeProperty("display");

        if (createFromScratch) {
            if (this.container?.parentElement === this.progressBar) {
                this.progressBar.insertBefore(this.customChaptersBar, this.container.nextSibling);
            } else {
                this.progressBar.prepend(this.customChaptersBar);
            }
        }

        this.updateChapterAllMutation(this.originalChapterBar, this.progressBar, true);
    }

    createChapterRenderGroups(segments: PreviewBarSegment[]): ChapterGroup[] {
        const result: ChapterGroup[] = [];

        segments?.forEach((segment, index) => {
            const latestChapter = result[result.length - 1];
            if (latestChapter && latestChapter.segment[1] > segment.segment[0]) {
                const segmentDuration = segment.segment[1] - segment.segment[0];
                if (segment.segment[0] < latestChapter.segment[0] 
                        || segmentDuration < latestChapter.originalDuration) {
                    // Remove latest if it starts too late
                    let latestValidChapter = latestChapter;
                    const chaptersToAddBack: ChapterGroup[] = []
                    while (latestValidChapter?.segment[0] >= segment.segment[0]) {
                        const invalidChapter = result.pop();
                        if (invalidChapter.segment[1] > segment.segment[1]) {
                            if (invalidChapter.segment[0] === segment.segment[0]) {
                                invalidChapter.segment[0] = segment.segment[1];
                            }

                            chaptersToAddBack.push(invalidChapter);
                        }
                        latestValidChapter = result[result.length - 1];
                    }

                    const priorityActionType = this.getActionTypePrioritized([segment.actionType, latestChapter?.actionType]);

                    // Split the latest chapter if smaller
                    result.push({
                        segment: [segment.segment[0], segment.segment[1]],
                        originalDuration: segmentDuration,
                        actionType: priorityActionType
                    });
                    if (latestValidChapter?.segment[1] > segment.segment[1]) {
                        result.push({
                            segment: [segment.segment[1], latestValidChapter.segment[1]],
                            originalDuration: latestValidChapter.originalDuration,
                            actionType: latestValidChapter.actionType
                        });
                    }

                    chaptersToAddBack.reverse();
                    let lastChapterChecked: number[] = segment.segment;
                    for (const chapter of chaptersToAddBack) {
                        if (chapter.segment[0] < lastChapterChecked[1]) {
                            chapter.segment[0] = lastChapterChecked[1];
                        }

                        lastChapterChecked = chapter.segment;
                    }
                    result.push(...chaptersToAddBack);
                    if (latestValidChapter) latestValidChapter.segment[1] = segment.segment[0];
                } else {
                    // Start at end of old one otherwise
                    result.push({
                        segment: [latestChapter.segment[1], segment.segment[1]],
                        originalDuration: segmentDuration,
                        actionType: segment.actionType
                    });
                }
            } else {
                // Add empty buffer before segment if needed
                const lastTime = latestChapter?.segment[1] || 0;
                if (segment.segment[0] > lastTime) {
                    result.push({
                        segment: [lastTime, segment.segment[0]],
                        originalDuration: 0,
                        actionType: null
                    });
                }

                // Normal case
                const endTime = Math.min(segment.segment[1], this.videoDuration);
                result.push({
                    segment: [segment.segment[0], endTime],
                    originalDuration: endTime - segment.segment[0],
                    actionType: segment.actionType
                });
            }

            // Add empty buffer after segment if needed
            if (index === segments.length - 1) {
                const nextSegment = segments[index + 1];
                const nextTime = nextSegment ? nextSegment.segment[0] : this.videoDuration;
                const lastTime = result[result.length - 1]?.segment[1] || segment.segment[1];
                if (this.intervalToDecimal(lastTime, nextTime) > MIN_CHAPTER_SIZE) {
                    result.push({
                        segment: [lastTime, nextTime],
                        originalDuration: 0,
                        actionType: null
                    });
                }
            }
        });

        return result;
    }

    private getActionTypePrioritized(actionTypes: ActionType[]): ActionType {
        if (actionTypes.includes(ActionType.Skip)) {
            return ActionType.Skip;
        } else if (actionTypes.includes(ActionType.Mute)) {
            return ActionType.Mute;
        } else {
            return actionTypes.find(a => a) ?? actionTypes[0];
        }
    }

    private setupChapterSection(section: HTMLElement, startTime: number, endTime: number, addMargin: boolean): void {
        const sizePercent = this.intervalToPercentage(startTime, endTime);
        if (addMargin) {
            section.style.marginRight = `${this.chapterMargin}px`;
            section.style.width = `calc(${sizePercent} - ${this.chapterMargin}px)`;
        } else {
            section.style.marginRight = "0";
            section.style.width = sizePercent;
        }

        section.setAttribute("decimal-width", String(this.intervalToDecimal(startTime, endTime)));
    }

    private firstTimeSetupChapterSection(section: HTMLElement): void {
        section.addEventListener("mouseenter", () => {
            this.hoveredSection?.classList.remove("ytp-exp-chapter-hover-effect");
            section.classList.add("ytp-exp-chapter-hover-effect");
            this.hoveredSection = section;
        });
    }

    private createChapterMutationObservers(): void {
        if (!this.progressBar || !this.originalChapterBar) return;

        const attributeObserver = new MutationObserver((mutations) => {
            const changes: Record<string, HTMLElement> = {};
            for (const mutation of mutations) {
                const currentElement = mutation.target as HTMLElement;
                if (mutation.type === "attributes"
                    && currentElement.parentElement?.classList.contains("ytp-progress-list")) {
                    changes[currentElement.classList[0]] = mutation.target as HTMLElement;
                }
            }

            this.updateChapterMutation(changes, this.progressBar);
        });

        attributeObserver.observe(this.originalChapterBar, {
            subtree: true,
            attributes: true,
            attributeFilter: ["style", "class"]
        });

        const childListObserver = new MutationObserver((mutations) => {
            const changes: Record<string, HTMLElement> = {};
            for (const mutation of mutations) {
                if (mutation.type === "childList") {
                    this.update();
                }
            }

            this.updateChapterMutation(changes, this.progressBar);
        });

        // Only direct children, no subtree
        childListObserver.observe(this.originalChapterBar, {
            childList: true
        });
    }

    private updateChapterAllMutation(originalChapterBar: HTMLElement, progressBar: HTMLElement, firstUpdate = false): void {
        const elements = originalChapterBar.querySelectorAll(".ytp-progress-list > *");
        const changes: Record<string, HTMLElement> = {};
        for (const element of elements) {
            changes[element.classList[0]] = element as HTMLElement;
        }

        this.updateChapterMutation(changes, progressBar, firstUpdate);
    }

    private updateChapterMutation(changes: Record<string, HTMLElement>, progressBar: HTMLElement, firstUpdate = false): void {
        // Go through each newly generated chapter bar and update the width based on changes array
        if (this.customChaptersBar) {
            // Width reached so far in decimal percent
            let cursor = 0;

            const sections = this.customChaptersBar.querySelectorAll(".ytp-chapter-hover-container") as NodeListOf<HTMLElement>;
            for (let i = 0; i < sections.length; i++) {
                const section = sections[i];

                const sectionWidthDecimal = parseFloat(section.getAttribute("decimal-width"));
                const sectionWidthDecimalNoMargin = sectionWidthDecimal - this.chapterMargin / progressBar.clientWidth;

                for (const className in changes) {
                    const selector = `.${className}`
                    const customChangedElement = section.querySelector(selector) as HTMLElement;
                    if (customChangedElement) {
                        const fullSectionWidth = i === sections.length - 1 ? sectionWidthDecimal : sectionWidthDecimalNoMargin;
                        const changedElement = changes[className];
                        const changedData = this.findLeftAndScale(selector, changedElement, progressBar);

                        const left = (changedData.left) / progressBar.clientWidth;
                        const calculatedLeft = Math.max(0, Math.min(1, (left - cursor) / fullSectionWidth));
                        if (!isNaN(left) && !isNaN(calculatedLeft)) {
                            customChangedElement.style.left = `${calculatedLeft * 100}%`;
                            customChangedElement.style.removeProperty("display");
                        }

                        if (changedData.scale !== null) {
                            const transformScale = (changedData.scale) / progressBar.clientWidth;

                            customChangedElement.style.transform = 
                                `scaleX(${Math.max(0, Math.min(1 - calculatedLeft, (transformScale - cursor) / fullSectionWidth - calculatedLeft))}`;
                            if (firstUpdate) {
                                customChangedElement.style.transition = "none";
                                setTimeout(() => customChangedElement.style.removeProperty("transition"), 50);
                            }
                        }

                        if (customChangedElement.className !== changedElement.className) {
                            customChangedElement.className = changedElement.className;
                        }
                    }
                }

                cursor += sectionWidthDecimal;
            }
        }
    }

    private findLeftAndScale(selector: string, currentElement: HTMLElement, progressBar: HTMLElement): 
            { left: number; scale: number } {
        const sections = currentElement.parentElement.parentElement.parentElement.children;
        let currentWidth = 0;
        let lastWidth = 0;

        let left = 0;
        let leftPosition = 0;

        let scale = null;
        let scalePosition = 0;
        let scaleWidth = 0;
        let lastScalePosition = 0;

        for (let i = 0; i < sections.length; i++) {
            const section = sections[i] as HTMLElement;
            const checkElement = section.querySelector(selector) as HTMLElement;
            const currentSectionWidthNoMargin = this.getPartialChapterSectionStyle(section, "width") || progressBar.clientWidth;
            const currentSectionWidth = currentSectionWidthNoMargin 
                + this.getPartialChapterSectionStyle(section, "marginRight");

            // First check for left
            const checkLeft = parseFloat(checkElement.style.left.replace("px", ""));
            if (checkLeft !== 0) {
                left = checkLeft;
                leftPosition = currentWidth;
            }

            // Then check for scale
            const transformMatch = checkElement.style.transform.match(/scaleX\(([0-9.]+?)\)/);
            if (transformMatch) {
                const transformScale = parseFloat(transformMatch[1]);
                const endPosition = transformScale + checkLeft / currentSectionWidthNoMargin;

                if (lastScalePosition > 0.99999 && endPosition === 0) {
                    // Last one was an end section that was fully filled
                    scalePosition = currentWidth - lastWidth;
                    break;
                }

                lastScalePosition = endPosition;

                scale = transformScale;
                scaleWidth = currentSectionWidthNoMargin;

                if ((i === sections.length - 1 || endPosition < 0.99999) && endPosition > 0) {
                    // reached the end of this section for sure
                    // if the scale is always zero, then it will go through all sections but still return 0

                    scalePosition = currentWidth;
                    if (checkLeft !== 0) {
                        scalePosition += left;
                    }
                    break;
                }
            }

            lastWidth = currentSectionWidth;
            currentWidth += lastWidth;
        }

        return { 
            left: left + leftPosition, 
            scale: scale !== null ? scale * scaleWidth + scalePosition : null
        };
    }

    private getPartialChapterSectionStyle(element: HTMLElement, param: string): number {
        const data = element.style[param];
        if (data?.includes("100%")) {
            return 0;
        } else {
            return parseInt(element.style[param].match(/\d+/g)?.[0]) || 0;
        }
    }

    updateChapterText(segments: SponsorTime[], submittingSegments: SponsorTime[], currentTime: number): SponsorTime[] {
        if (!Config.config.showSegmentNameInChapterBar 
                || ((!segments || segments.length <= 0) && submittingSegments?.length <= 0)) {
            const chaptersContainer = this.getChaptersContainer();
            const chapterButton = this.getChapterButton(chaptersContainer);
            if (chapterButton.classList.contains("ytp-chapter-container-disabled")) {
                chaptersContainer.style.display = "none";
            }

            return;
        }

        segments ??= [];
        if (submittingSegments?.length > 0) segments = segments.concat(submittingSegments);
        const activeSegments = segments.filter((segment) => {
            return segment.hidden === SponsorHideType.Visible 
                && segment.segment[0] <= currentTime && segment.segment[1] > currentTime
                && segment.category !== DEFAULT_CATEGORY;
        });

        this.setActiveSegments(activeSegments);
        return activeSegments;
    }

    /**
     * Adds the text to the chapters slot if not filled by default
     */
    private setActiveSegments(segments: SponsorTime[]): void {
        const chaptersContainer = this.getChaptersContainer();

        if (chaptersContainer) {
            if (segments.length > 0) {
                chaptersContainer.style.removeProperty("display");

                const chosenSegment = segments.sort((a, b) => {
                    if (a.actionType === ActionType.Chapter && b.actionType !== ActionType.Chapter) {
                        return -1;
                    } else if (a.actionType !== ActionType.Chapter && b.actionType === ActionType.Chapter) {
                        return 1;
                    } else {
                        return (b.segment[0] - a.segment[0]);
                    }
                })[0];

                const chapterButton = this.getChapterButton(chaptersContainer);
                chapterButton.classList.remove("ytp-chapter-container-disabled");
                chapterButton.disabled = false;

                const chapterTitle = chaptersContainer.querySelector(".ytp-chapter-title-content") as HTMLDivElement;
                chapterTitle.innerText = chosenSegment.description || shortCategoryName(chosenSegment.category);
                if (chosenSegment.actionType !== ActionType.Chapter) {
                    chapterTitle.classList.add("sponsorBlock-segment-title");
                } else {
                    chapterTitle.classList.remove("sponsorBlock-segment-title");
                }

                if (chosenSegment.source === SponsorSourceType.Server) {
                    const chapterVoteContainer = this.chapterVote.getContainer();
                    if (!chapterButton.contains(chapterVoteContainer)) {
                        const oldVoteContainers = document.querySelectorAll("#chapterVote");
                        if (oldVoteContainers.length > 0) {
                            oldVoteContainers.forEach((oldVoteContainer) => oldVoteContainer.remove());
                        }
                        
                        chapterButton.insertBefore(chapterVoteContainer, this.getChapterChevron());
                    }

                    this.chapterVote.setVisibility(true);
                    this.chapterVote.setSegment(chosenSegment);
                } else {
                    this.chapterVote.setVisibility(false);
                }
            } else {
                chaptersContainer.style.display = "none";
                this.chapterVote.setVisibility(false);
            }
        }
    }

    private getChaptersContainer(): HTMLElement {
        return document.querySelector(".ytp-chapter-container") as HTMLElement;
    }

    private getChapterButton(chaptersContainer: HTMLElement): HTMLButtonElement {
        return (chaptersContainer ?? this.getChaptersContainer())
            .querySelector("button.ytp-chapter-title") as HTMLButtonElement;
    }

    remove(): void {
        this.container.remove();

        if (this.categoryTooltip) {
            this.categoryTooltip.remove();
            this.categoryTooltip = undefined;
        }

        if (this.categoryTooltipContainer) {
            this.categoryTooltipContainer.classList.remove(TOOLTIP_VISIBLE_CLASS);
            this.categoryTooltipContainer = undefined;
        }
    }

    private chapterFilter(segment: PreviewBarSegment): boolean {
        return (Config.config.renderSegmentsAsChapters || segment.actionType === ActionType.Chapter)
                && segment.actionType !== ActionType.Poi
                && this.chapterGroupFilter(segment);
    }

    private chapterGroupFilter(segment: SegmentContainer): boolean {
        return segment.segment.length === 2 && this.intervalToDecimal(segment.segment[0], segment.segment[1]) > MIN_CHAPTER_SIZE;
    }

    intervalToPercentage(startTime: number, endTime: number) {
        return `${this.intervalToDecimal(startTime, endTime) * 100}%`;
    }

    intervalToDecimal(startTime: number, endTime: number) {
        return (this.timeToDecimal(endTime) - this.timeToDecimal(startTime));
    }

    timeToPercentage(time: number): string {
        return `${this.timeToDecimal(time) * 100}%`
    }

    timeToDecimal(time: number): number {
        if (this.originalChapterBarBlocks?.length > 1 && this.existingChapters.length === this.originalChapterBarBlocks?.length) {
            // Parent element to still work when display: none
            const totalPixels = this.originalChapterBar.parentElement.clientWidth;
            let pixelOffset = 0;
            let lastCheckedChapter = -1;
            for (let i = 0; i < this.originalChapterBarBlocks.length; i++) {
                const chapterElement = this.originalChapterBarBlocks[i];
                const widthPixels = parseFloat(chapterElement.style.width.replace("px", ""));
                
                if (time >= this.existingChapters[i].segment[1]) {
                    const marginPixels = chapterElement.style.marginRight ? parseFloat(chapterElement.style.marginRight.replace("px", "")) : 0;
                    pixelOffset += widthPixels + marginPixels;
                    lastCheckedChapter = i;
                } else {
                    break;
                }
            }

            // The next chapter is the one we are currently inside of
            const latestChapter = this.existingChapters[lastCheckedChapter + 1];
            if (latestChapter) {
                const latestWidth = parseFloat(this.originalChapterBarBlocks[lastCheckedChapter + 1].style.width.replace("px", ""));
                const latestChapterDuration = latestChapter.segment[1] - latestChapter.segment[0];
    
                const percentageInCurrentChapter = (time - latestChapter.segment[0]) / latestChapterDuration; 
                const sizeOfCurrentChapter = latestWidth / totalPixels;
                return Math.min(1, ((pixelOffset / totalPixels) + (percentageInCurrentChapter * sizeOfCurrentChapter)));
            }
        }

        return Math.min(1, time / this.videoDuration);
    }

    /*
    * Approximate size on preview bar for smallest element (due to &nbsp)
    */
    getMinimumSize(showLarger = false): number {
        return this.videoDuration * (showLarger ? 0.006 : 0.003);
    }

    private getSmallestSegment(timeInSeconds: number, segments: PreviewBarSegment[]): PreviewBarSegment | null {
        let segment: PreviewBarSegment | null = null;
        let currentSegmentLength = Infinity;

        for (const seg of segments) { //
            const segmentLength = seg.segment[1] - seg.segment[0];
            const minSize = this.getMinimumSize(seg.showLarger);

            const startTime = segmentLength !== 0 ? seg.segment[0] : Math.floor(seg.segment[0]);
            const endTime = segmentLength > minSize ? seg.segment[1] : Math.ceil(seg.segment[0] + minSize);
            if (startTime <= timeInSeconds && endTime >= timeInSeconds) {
                if (segmentLength < currentSegmentLength) {
                    currentSegmentLength = segmentLength;
                    segment = seg;
                }
            }
        }

        return segment;
    }

    private getChapterChevron(): HTMLElement {
        return document.querySelector(".ytp-chapter-title-chevron");
    }
}

export default PreviewBar;