import Slider from './slider';
const $ = require('jquery');

class Timeline {
    constructor(section) {
        this.section = section;
        this.itemSlider = section.find('.item-slider');
        this.yearsWrapper = section.find('.years-wrapper');
        this.yearsContainer = section.find('.years .container');
        this.years = this.yearsWrapper.find('.year-item');

        this.initResize();
        this.initDragging();
        this.buildSlider();
        this.initYearClick();
        this.activateItem(0);
        this.initSwitch();
        // this.initDocking();
    }

    initDocking() {
        this.winPosition = 0;
        this.secPosition = $(this.section.parent()).offset().top;
        this.scrolling = false;

        $(window).on('scroll', () => {
            if (this.scrolling) {
                return false;
            }
            const st = $(window).scrollTop();
            if (st > this.winPosition && st < this.secPosition - 100) {
                this.scrolling = true;
                $('html, body').animate({scrollTop: this.secPosition - 100}, 200, () => {
                    this.scrolling = false;
                })
            }
            this.winPosition = st;
        })
    }

    initSwitch() {
        this.switches = this.section.siblings('.timeline-tabs').find('a');
        this.switchSlides = [];
        this.switches.each((index, tab) => {
            const href = tab.href;
            const id = href.substr(href.indexOf('#'));
            const target = parseInt($(id).attr('data-index'));
            this.switchSlides.push(target);
            tab.setAttribute('data-index', index);
            tab.setAttribute('data-target', target);
        })

        this.slider.section.on('slide-change', () => {
            this.switches.removeClass('active');
            const cs = this.slider.currentSlide;
            let i = this.switchSlides.length - 1;
            while (i >= 0) {
                if (cs >= this.switchSlides[i]) {
                    this.switches.eq(i).addClass('active');
                    break;
                }
                i--;
            }
        })

        this.switches.on('click', (e) => {
            e.preventDefault();
            const target = parseInt(e.currentTarget.getAttribute('data-target'));
            this.slider.goTo(target, false);
        })
    }

    initResize() {
        this.resizeTimeout = null;

        $(window).on('resize', () => {
            if (this.resizeTimeout) {
                clearTimeout(this.resizeTimeout);
            }
            this.resizeTimeout = setTimeout(() => {
                this.handleResize();
            }, 200)
        })

        this.handleResize();
    }

    handleResize() {
        this.containerWidth = this.yearsContainer.width();
        this.wrapperWidth = this.yearsWrapper.get(0).scrollWidth;
        this.scrollWidth = this.containerWidth - this.wrapperWidth;
        this.yearsWrapper.css({'width': this.wrapperWidth + 'px'});
    }

    initDragging() {
        this.dragOffset = 0;
        this.wrapperOffset = 0;

        this.yearsWrapper.get(0).onmousedown = (e) => { this.dragStart(e) };

        this.yearsWrapper.get(0).addEventListener('touchstart', (e) => {this.dragStart(e)});
        this.yearsWrapper.get(0).addEventListener('touchend', (e) => {this.dragEnd(e)});
        this.yearsWrapper.get(0).addEventListener('touchmove', (e) => {this.dragMove(e)});
    }

    dragStart(e) {
        this.dragOffset = 0;
        this.dragLast = 0;

        if (e.type === 'touchstart') {
            this.dragOrigin = e.touches[0].clientX;
        } else {
            this.dragOrigin = e.clientX;
            document.onmouseup = (e) => { this.dragEnd(e) };
            document.onmousemove = (e) => { this.dragMove(e) };
        }
    }

    dragMove(e) {
        if (e.type === 'touchmove') {
            this.dragLast = this.dragOffset;
            this.dragOffset = this.dragOrigin - e.touches[0].clientX;
        } else {
            this.dragLast = this.dragOffset;
            this.dragOffset = this.dragOrigin - e.clientX;
        }
        if (Math.abs(this.dragOffset) > 3) {
            this.yearsWrapper.addClass('dragging');
        }

        this.wrapperTarget = this.wrapperOffset - this.dragOffset;
        if (this.wrapperTarget > 0) {
            this.wrapperTarget = this.wrapperTarget / 4;
        } else if (this.wrapperTarget < this.scrollWidth) {
            this.wrapperTarget = this.scrollWidth + (this.wrapperTarget - this.scrollWidth) / 4;
        }

        this.yearsWrapper.css({'transform': 'translateX(' + this.wrapperTarget + 'px)'});
    }

    dragEnd() {
        const velocity = this.dragOffset - this.dragLast;
        if (Math.abs(velocity) > 5) {
            this.wrapperTarget = this.wrapperTarget - velocity * 10;
        }

        const bounceBack = this.checkScrollEnd();

        this.yearsWrapper.removeClass('dragging');
        this.wrapperOffset = this.wrapperTarget;

        if (bounceBack || Math.abs(velocity) > 5) {
            this.animateToPosition();
        }


        document.onmouseup = null;
        document.onmousemove = null;
    }

    animateToPosition() {
        this.yearsWrapper.addClass('animate');

        requestAnimationFrame(() => {
            this.yearsWrapper.css({'transform': 'translateX(' + this.wrapperTarget + 'px)'});
            setTimeout(() => {
                this.yearsWrapper.removeClass('animate');
            }, 300);
        })
    }

    buildSlider() {
        const slides = this.itemSlider.addClass('slider').appendTo(this.itemSlider);

        this.years.find('.items > li').each((i, li) => {
            const listItem = $(li);
            listItem.attr('data-index', i).find('.slide').appendTo(slides);
            listItem.on('click', () => {
                this.slider.goTo(i, true);
                this.activateItem(i);
            })
        })

        this.slider = new Slider(slides);
        this.slider.section.on('slide-change', () => {
            this.activateItem(this.slider.currentSlide);
        })

        this.slides = this.slider.section.find('.slide');
    }

    initYearClick() {
        this.years.children('.year').on('click', (e) => {
            $(e.currentTarget).next('.items').children('li').first().trigger('click');
        })
    }

    activateItem(index) {
        this.years.removeClass('current').find('li.active').removeClass('active');
        const yearItem = this.years.find('li[data-index="' + index + '"]').addClass('active').closest('.year-item').addClass('current');
        const ww = $(window).width();
        const iw = yearItem.outerWidth() * 1.5;

        if (yearItem.offset().left + iw > ww || yearItem.offset().left < 50) {
            this.wrapperOffset = this.wrapperTarget = yearItem.position().left * -1;
            this.checkScrollEnd();
            this.animateToPosition();
        }

        if (this.slides.eq(index).hasClass('has-image')) {
            this.slider.section.addClass('hide-circle');
        } else {
            this.slider.section.removeClass('hide-circle');
        }
    }

    checkScrollEnd() {
        if (this.wrapperTarget > 0) {
            this.wrapperTarget = 0;
            return true;
        } else if (this.wrapperTarget < this.scrollWidth) {
            this.wrapperTarget = this.scrollWidth;
            return true;
        }

        return false;
    }
}

$('body').on('ihk-init dynamic-component-loaded gfi-dynamic-init', function () {
    $('.timeline:not(.initiated)').each((i, el) => {
        new Timeline($(el));
    })
})