import $ from '../../utils/dom';
import Utils from '../../utils/utils';

const Pagination = {
  update() {
    // Render || Update Pagination bullets/items
    const swiper = this;
    const rtl = swiper.rtl;
    const params = swiper.params.pagination;
    if (!params.el || !swiper.pagination.el || !swiper.pagination.$el || swiper.pagination.$el.length === 0) return;
    const slidesLength = swiper.virtual && swiper.params.virtual.enabled ? swiper.virtual.slides.length : swiper.slides.length;
    const $el = swiper.pagination.$el;
    // Current/Total
    let current;
    const total = swiper.params.loop ? Math.ceil((slidesLength - (swiper.loopedSlides * 2)) / swiper.params.slidesPerGroup) : swiper.snapGrid.length;
    if (swiper.params.loop) {
      current = Math.ceil((swiper.activeIndex - swiper.loopedSlides) / swiper.params.slidesPerGroup);
      if (current > slidesLength - 1 - (swiper.loopedSlides * 2)) {
        current -= (slidesLength - (swiper.loopedSlides * 2));
      }
      if (current > total - 1) current -= total;
      if (current < 0 && swiper.params.paginationType !== 'bullets') current = total + current;
    } else if (typeof swiper.snapIndex !== 'undefined') {
      current = swiper.snapIndex;
    } else {
      current = swiper.activeIndex || 0;
    }
    // Types
    if (params.type === 'bullets' && swiper.pagination.bullets && swiper.pagination.bullets.length > 0) {
      const bullets = swiper.pagination.bullets;
      let firstIndex;
      let lastIndex;
      let midIndex;
      if (params.dynamicBullets) {
        swiper.pagination.bulletSize = bullets.eq(0)[swiper.isHorizontal() ? 'outerWidth' : 'outerHeight'](true);
        $el.css(swiper.isHorizontal() ? 'width' : 'height', `${swiper.pagination.bulletSize * (params.dynamicMainBullets + 4)}px`);
        if (params.dynamicMainBullets > 1 && swiper.previousIndex !== undefined) {
          swiper.pagination.dynamicBulletIndex += (current - swiper.previousIndex);
          if (swiper.pagination.dynamicBulletIndex > (params.dynamicMainBullets - 1)) {
            swiper.pagination.dynamicBulletIndex = params.dynamicMainBullets - 1;
          } else if (swiper.pagination.dynamicBulletIndex < 0) {
            swiper.pagination.dynamicBulletIndex = 0;
          }
        }
        firstIndex = current - swiper.pagination.dynamicBulletIndex;
        lastIndex = firstIndex + (Math.min(bullets.length, params.dynamicMainBullets) - 1);
        midIndex = (lastIndex + firstIndex) / 2;
      }
      bullets.removeClass(`${params.bulletActiveClass} ${params.bulletActiveClass}-next ${params.bulletActiveClass}-next-next ${params.bulletActiveClass}-prev ${params.bulletActiveClass}-prev-prev ${params.bulletActiveClass}-main`);
      if ($el.length > 1) {
        bullets.each((index, bullet) => {
          const $bullet = $(bullet);
          const bulletIndex = $bullet.index();
          if (bulletIndex === current) {
            $bullet.addClass(params.bulletActiveClass);
          }
          if (params.dynamicBullets) {
            if (bulletIndex >= firstIndex && bulletIndex <= lastIndex) {
              $bullet.addClass(`${params.bulletActiveClass}-main`);
            }
            if (bulletIndex === firstIndex) {
              $bullet
                .prev()
                .addClass(`${params.bulletActiveClass}-prev`)
                .prev()
                .addClass(`${params.bulletActiveClass}-prev-prev`);
            }
            if (bulletIndex === lastIndex) {
              $bullet
                .next()
                .addClass(`${params.bulletActiveClass}-next`)
                .next()
                .addClass(`${params.bulletActiveClass}-next-next`);
            }
          }
        });
      } else {
        const $bullet = bullets.eq(current);
        $bullet.addClass(params.bulletActiveClass);
        if (params.dynamicBullets) {
          const $firstDisplayedBullet = bullets.eq(firstIndex);
          const $lastDisplayedBullet = bullets.eq(lastIndex);
          for (let i = firstIndex; i <= lastIndex; i += 1) {
            bullets.eq(i).addClass(`${params.bulletActiveClass}-main`);
          }
          $firstDisplayedBullet
            .prev()
            .addClass(`${params.bulletActiveClass}-prev`)
            .prev()
            .addClass(`${params.bulletActiveClass}-prev-prev`);
          $lastDisplayedBullet
            .next()
            .addClass(`${params.bulletActiveClass}-next`)
            .next()
            .addClass(`${params.bulletActiveClass}-next-next`);
        }
      }
      if (params.dynamicBullets) {
        const dynamicBulletsLength = Math.min(bullets.length, params.dynamicMainBullets + 4);
        const bulletsOffset = (((swiper.pagination.bulletSize * dynamicBulletsLength) - (swiper.pagination.bulletSize)) / 2) - (midIndex * swiper.pagination.bulletSize);
        const offsetProp = rtl ? 'right' : 'left';
        bullets.css(swiper.isHorizontal() ? offsetProp : 'top', `${bulletsOffset}px`);
      }
    }
    if (params.type === 'fraction') {
      $el.find(`.${params.currentClass}`).text(params.formatFractionCurrent(current + 1));
      $el.find(`.${params.totalClass}`).text(params.formatFractionTotal(total));
    }
    if (params.type === 'progressbar') {
      let progressbarDirection;
      if (params.progressbarOpposite) {
        progressbarDirection = swiper.isHorizontal() ? 'vertical' : 'horizontal';
      } else {
        progressbarDirection = swiper.isHorizontal() ? 'horizontal' : 'vertical';
      }
      const scale = (current + 1) / total;
      let scaleX = 1;
      let scaleY = 1;
      if (progressbarDirection === 'horizontal') {
        scaleX = scale;
      } else {
        scaleY = scale;
      }
      $el.find(`.${params.progressbarFillClass}`).transform(`translate3d(0,0,0) scaleX(${scaleX}) scaleY(${scaleY})`).transition(swiper.params.speed);
    }
    if (params.type === 'custom' && params.renderCustom) {
      $el.html(params.renderCustom(swiper, current + 1, total));
      swiper.emit('paginationRender', swiper, $el[0]);
    } else {
      swiper.emit('paginationUpdate', swiper, $el[0]);
    }
    $el[swiper.params.watchOverflow && swiper.isLocked ? 'addClass' : 'removeClass'](params.lockClass);
  },
  render() {
    // Render Container
    const swiper = this;
    const params = swiper.params.pagination;
    if (!params.el || !swiper.pagination.el || !swiper.pagination.$el || swiper.pagination.$el.length === 0) return;
    const slidesLength = swiper.virtual && swiper.params.virtual.enabled ? swiper.virtual.slides.length : swiper.slides.length;

    const $el = swiper.pagination.$el;
    let paginationHTML = '';
    if (params.type === 'bullets') {
      const numberOfBullets = swiper.params.loop ? Math.ceil((slidesLength - (swiper.loopedSlides * 2)) / swiper.params.slidesPerGroup) : swiper.snapGrid.length;
      for (let i = 0; i < numberOfBullets; i += 1) {
        if (params.renderBullet) {
          paginationHTML += params.renderBullet.call(swiper, i, params.bulletClass);
        } else {
          paginationHTML += `<${params.bulletElement} class="${params.bulletClass}"></${params.bulletElement}>`;
        }
      }
      $el.html(paginationHTML);
      swiper.pagination.bullets = $el.find(`.${params.bulletClass}`);
    }
    if (params.type === 'fraction') {
      if (params.renderFraction) {
        paginationHTML = params.renderFraction.call(swiper, params.currentClass, params.totalClass);
      } else {
        paginationHTML = `<span class="${params.currentClass}"></span>`
        + ' / '
        + `<span class="${params.totalClass}"></span>`;
      }
      $el.html(paginationHTML);
    }
    if (params.type === 'progressbar') {
      if (params.renderProgressbar) {
        paginationHTML = params.renderProgressbar.call(swiper, params.progressbarFillClass);
      } else {
        paginationHTML = `<span class="${params.progressbarFillClass}"></span>`;
      }
      $el.html(paginationHTML);
    }
    if (params.type !== 'custom') {
      swiper.emit('paginationRender', swiper.pagination.$el[0]);
    }
  },
  init() {
    const swiper = this;
    const params = swiper.params.pagination;
    if (!params.el) return;

    let $el = $(params.el);
    if ($el.length === 0) return;

    if (
      swiper.params.uniqueNavElements
      && typeof params.el === 'string'
      && $el.length > 1
      && swiper.$el.find(params.el).length === 1
    ) {
      $el = swiper.$el.find(params.el);
    }

    if (params.type === 'bullets' && params.clickable) {
      $el.addClass(params.clickableClass);
    }

    $el.addClass(params.modifierClass + params.type);

    if (params.type === 'bullets' && params.dynamicBullets) {
      $el.addClass(`${params.modifierClass}${params.type}-dynamic`);
      swiper.pagination.dynamicBulletIndex = 0;
      if (params.dynamicMainBullets < 1) {
        params.dynamicMainBullets = 1;
      }
    }
    if (params.type === 'progressbar' && params.progressbarOpposite) {
      $el.addClass(params.progressbarOppositeClass);
    }

    if (params.clickable) {
      $el.on('click', `.${params.bulletClass}`, function onClick(e) {
        e.preventDefault();
        let index = $(this).index() * swiper.params.slidesPerGroup;
        if (swiper.params.loop) index += swiper.loopedSlides;
        swiper.slideTo(index);
      });
    }

    Utils.extend(swiper.pagination, {
      $el,
      el: $el[0],
    });
  },
  destroy() {
    const swiper = this;
    const params = swiper.params.pagination;
    if (!params.el || !swiper.pagination.el || !swiper.pagination.$el || swiper.pagination.$el.length === 0) return;
    const $el = swiper.pagination.$el;

    $el.removeClass(params.hiddenClass);
    $el.removeClass(params.modifierClass + params.type);
    if (swiper.pagination.bullets) swiper.pagination.bullets.removeClass(params.bulletActiveClass);
    if (params.clickable) {
      $el.off('click', `.${params.bulletClass}`);
    }
  },
};

export default {
  name: 'pagination',
  params: {
    pagination: {
      el: null,
      bulletElement: 'span',
      clickable: false,
      hideOnClick: false,
      renderBullet: null,
      renderProgressbar: null,
      renderFraction: null,
      renderCustom: null,
      progressbarOpposite: false,
      type: 'bullets', // 'bullets' or 'progressbar' or 'fraction' or 'custom'
      dynamicBullets: false,
      dynamicMainBullets: 1,
      formatFractionCurrent: number => number,
      formatFractionTotal: number => number,
      bulletClass: 'swiper-pagination-bullet',
      bulletActiveClass: 'swiper-pagination-bullet-active',
      modifierClass: 'swiper-pagination-', // NEW
      currentClass: 'swiper-pagination-current',
      totalClass: 'swiper-pagination-total',
      hiddenClass: 'swiper-pagination-hidden',
      progressbarFillClass: 'swiper-pagination-progressbar-fill',
      progressbarOppositeClass: 'swiper-pagination-progressbar-opposite',
      clickableClass: 'swiper-pagination-clickable', // NEW
      lockClass: 'swiper-pagination-lock',
    },
  },
  create() {
    const swiper = this;
    Utils.extend(swiper, {
      pagination: {
        init: Pagination.init.bind(swiper),
        render: Pagination.render.bind(swiper),
        update: Pagination.update.bind(swiper),
        destroy: Pagination.destroy.bind(swiper),
        dynamicBulletIndex: 0,
      },
    });
  },
  on: {
    init() {
      const swiper = this;
      swiper.pagination.init();
      swiper.pagination.render();
      swiper.pagination.update();
    },
    activeIndexChange() {
      const swiper = this;
      if (swiper.params.loop) {
        swiper.pagination.update();
      } else if (typeof swiper.snapIndex === 'undefined') {
        swiper.pagination.update();
      }
    },
    snapIndexChange() {
      const swiper = this;
      if (!swiper.params.loop) {
        swiper.pagination.update();
      }
    },
    slidesLengthChange() {
      const swiper = this;
      if (swiper.params.loop) {
        swiper.pagination.render();
        swiper.pagination.update();
      }
    },
    snapGridLengthChange() {
      const swiper = this;
      if (!swiper.params.loop) {
        swiper.pagination.render();
        swiper.pagination.update();
      }
    },
    destroy() {
      const swiper = this;
      swiper.pagination.destroy();
    },
    click(e) {
      const swiper = this;
      if (
        swiper.params.pagination.el
        && swiper.params.pagination.hideOnClick
        && swiper.pagination.$el.length > 0
        && !$(e.target).hasClass(swiper.params.pagination.bulletClass)
      ) {
        swiper.pagination.$el.toggleClass(swiper.params.pagination.hiddenClass);
      }
    },
  },
};
