/*
 * https://github.com/morethanwords/tweb
 * Copyright (C) 2019-2021 Eduard Kuzmenko
 * https://github.com/morethanwords/tweb/blob/master/LICENSE
 */

import { TransitionSlider } from "./transition";
import { ScrollableX } from "./scrollable";
import rootScope from "../lib/rootScope";
import { fastRaf } from "../helpers/schedulers";
import { FocusDirection } from "../helpers/fastSmoothScroll";
import findUpAsChild from "../helpers/dom/findUpAsChild";
import whichChild from "../helpers/dom/whichChild";

export function horizontalMenu(
  tabs: HTMLElement, 
  content: HTMLElement, 
  onClick?: (id: number, tabContent: HTMLDivElement, animate: boolean) => void | boolean | Promise<void | boolean>, 
  onTransitionEnd?: () => void, 
  transitionTime = 250, 
  scrollableX?: ScrollableX
) {
  const selectTab = TransitionSlider(content, tabs || content.dataset.animation === 'tabs' ? 'tabs' : 'navigation', transitionTime, onTransitionEnd);

  if(!tabs) {
    return selectTab;
  }

  const proxy = new Proxy(selectTab, {
    apply: (target, that, args) => {
      const id = +args[0];
      const animate = args[1] !== undefined ? args[1] : true;

      const el = (tabs.querySelector(`[data-tab="${id}"]`) || tabs.children[id]) as HTMLElement;
      selectTarget(el, id, animate);
    }
  });

  const selectTarget = async(target: HTMLElement, id: number, animate = true) => {
    const tabContent = content.children[id] as HTMLDivElement;

    if(onClick) {
      const canChange = await onClick(id, tabContent, animate);
      if(canChange !== undefined && !canChange) {
        return;
      }
    }

    if(scrollableX) {
      scrollableX.scrollIntoViewNew({
        element: target.parentElement.children[id] as HTMLElement, 
        position: 'center', 
        forceDirection: animate ? undefined : FocusDirection.Static, 
        forceDuration: transitionTime, 
        axis: 'x'
      });
    }

    if(!rootScope.settings.animationsEnabled) {
      animate = false;
    }

    const prevId = selectTab.prevId();
    if(target.classList.contains('active') || id === prevId) {
      return false;
    }
    
    const mutateCallback = animate ? fastRaf : (cb: () => void) => cb();
    
    const prev = tabs.querySelector(tagName.toLowerCase() + '.active') as HTMLElement;
    if(prev) {
      mutateCallback(() => {
        prev.classList.remove('active');
      });
    }
    
    // a great stripe from Jolly Cobra
    if(useStripe && prevId !== -1 && animate) {
      mutateCallback(() => {
        const indicator = target.querySelector('i')!;
        const currentIndicator = target.parentElement.children[prevId].querySelector('i')!;
  
        currentIndicator.classList.remove('animate');
        indicator.classList.remove('animate');
  
        // We move and resize our indicator so it repeats the position and size of the previous one.
        const shiftLeft = currentIndicator.parentElement.parentElement.offsetLeft - indicator.parentElement.parentElement.offsetLeft;
        const scaleFactor = currentIndicator.clientWidth / indicator.clientWidth;
        indicator.style.transform = `translate3d(${shiftLeft}px, 0, 0) scale3d(${scaleFactor}, 1, 1)`;

        //console.log(`translate3d(${shiftLeft}px, 0, 0) scale3d(${scaleFactor}, 1, 1)`);
  
        fastRaf(() => {
          // Now we remove the transform to let it animate to its own position and size.
          indicator.classList.add('animate');
          indicator.style.transform = 'none';
        });
      });
    }

    mutateCallback(() => {
      target.classList.add('active');
    });
    
    selectTab(id, animate);
  };

  const useStripe = !tabs.classList.contains('no-stripe');

  //const tagName = tabs.classList.contains('menu-horizontal-div') ? 'BUTTON' : 'LI';
  const tagName = tabs.firstElementChild.tagName;
  tabs.addEventListener('click', function(e) {
    let target = e.target as HTMLElement;
    
    target = findUpAsChild(target, tabs);
    
    //console.log('tabs click:', target);
    
    if(!target) return false;

    let id: number;
    if(target.dataset.tab) {
      id = +target.dataset.tab;
      if(id === -1) {
        return false;
      }
    } else {
      id = whichChild(target);
    }

    selectTarget(target, id);
  });

  return proxy;
}
