import React, { useState, useRef } from 'react';
import find from 'lodash/find';
import filter from 'lodash/filter';
import classnames from 'classnames';
import { IconHome2, IconChevronRight, IconChevronLeft } from '@tabler/icons';
import { useSelector, useDispatch } from 'react-redux';
import { focusTab } from 'providers/ReduxStore/slices/tabs';
import NewRequest from 'components/Sidebar/NewRequest';
import CollectionToolBar from './CollectionToolBar';
import RequestTab from './RequestTab';
import StyledWrapper from './StyledWrapper';

const RequestTabs = () => {
  const dispatch = useDispatch();
  const tabsRef = useRef();
  const [newRequestModalOpen, setNewRequestModalOpen] = useState(false);
  const tabs = useSelector((state) => state.tabs.tabs);
  const activeTabUid = useSelector((state) => state.tabs.activeTabUid);
  const collections = useSelector((state) => state.collections.collections);
  const leftSidebarWidth = useSelector((state) => state.app.leftSidebarWidth);
  const screenWidth = useSelector((state) => state.app.screenWidth);

  const getTabClassname = (tab, index) => {
    return classnames("request-tab select-none", {
      'active': tab.uid === activeTabUid,
      'last-tab': tabs && tabs.length && (index === tabs.length - 1) 
    });
  };

  const handleClick = (tab) => {
    dispatch(focusTab({
      uid: tab.uid
    }));
  };

  const createNewTab = () => setNewRequestModalOpen(true);

  if(!activeTabUid) {
    return null;
  }

  const activeTab = find(tabs, (t) => t.uid === activeTabUid);
  if(!activeTab) {
    return (
      <StyledWrapper>
        Something went wrong!
      </StyledWrapper>
    );
  }

  const activeCollection = find(collections, (c) => c.uid === activeTab.collectionUid);
  const collectionRequestTabs = filter(tabs, (t) => t.collectionUid === activeTab.collectionUid);

  const maxTablistWidth = screenWidth - leftSidebarWidth - 150;
  const tabsWidth = (collectionRequestTabs.length * 150) + 34; // 34: (+)icon
  const showChevrons = maxTablistWidth < tabsWidth;

  const leftSlide = () => {
    tabsRef.current.scrollBy({
      left: -120,
      behavior: 'smooth'
    });
  };

  // todo: bring new tab to focus if its not in focus
  // tabsRef.current.scrollLeft

  const rightSlide = () => {
    tabsRef.current.scrollBy({
      left: 120,
      behavior: 'smooth'
    });
  };

  const getRootClassname = () => {
    return classnames({
      'has-chevrons': showChevrons
    });
  };

  return (
    <StyledWrapper className={getRootClassname()}>
      {newRequestModalOpen && <NewRequest isEphermal={true} collection={activeCollection} onClose={() => setNewRequestModalOpen(false)}/>}
      {collectionRequestTabs && collectionRequestTabs.length ? (
        <>
          <CollectionToolBar collection={activeCollection}/>
          <div className="flex items-center pl-4">
            <ul role="tablist">
              {showChevrons ? (
                <li className="select-none short-tab" onClick={leftSlide}>
                  <div className="flex items-center">
                    <IconChevronLeft size={18} strokeWidth={1.5}/>
                  </div>
                </li>
              ) : null}
              {/* Moved to post mvp */}
              {/* <li className="select-none new-tab mr-1" onClick={createNewTab}>
                <div className="flex items-center home-icon-container">
                  <IconHome2 size={18} strokeWidth={1.5}/>
                </div>
              </li> */}
            </ul>
            <ul role="tablist" style={{maxWidth: maxTablistWidth}} ref={tabsRef}>
              {collectionRequestTabs && collectionRequestTabs.length ? collectionRequestTabs.map((tab, index) => {
                return (
                  <li key={tab.uid} className={getTabClassname(tab, index)} role="tab" onClick={() => handleClick(tab)}>
                    <RequestTab key={tab.uid} tab={tab} collection={activeCollection} activeTab={activeTab}/>
                  </li>
                )
              }) : null}
            </ul>
            
            <ul role="tablist">
              {showChevrons ? (
                <li className="select-none short-tab" onClick={rightSlide}>
                  <div className="flex items-center">
                    <IconChevronRight size={18} strokeWidth={1.5}/>
                  </div>
                </li>
              ) : null}
              <li className={`select-none short-tab ${showChevrons ? '' : 'ml-1'}`} onClick={createNewTab}>
                <div className="flex items-center">
                  <svg xmlns="http://www.w3.org/2000/svg" width="22" height="22" fill="currentColor"  viewBox="0 0 16 16">
                    <path d="M8 4a.5.5 0 0 1 .5.5v3h3a.5.5 0 0 1 0 1h-3v3a.5.5 0 0 1-1 0v-3h-3a.5.5 0 0 1 0-1h3v-3A.5.5 0 0 1 8 4z"/>
                  </svg>
                </div>
              </li>
              {/* Moved to post mvp */}
              {/* <li className="select-none new-tab choose-request">
                <div className="flex items-center">
                  <svg xmlns="http://www.w3.org/2000/svg" width="20" height="20" fill="currentColor" viewBox="0 0 16 16">
                    <path d="M3 9.5a1.5 1.5 0 1 1 0-3 1.5 1.5 0 0 1 0 3zm5 0a1.5 1.5 0 1 1 0-3 1.5 1.5 0 0 1 0 3zm5 0a1.5 1.5 0 1 1 0-3 1.5 1.5 0 0 1 0 3z"/>
                  </svg>
                </div>
              </li> */}
            </ul>
          </div>
        </>
      ) : null}
    </StyledWrapper>
  );
};

export default RequestTabs;