import React from "react"
import { Link, withRouter } from "react-router-dom"
import { Course } from "src/common/index"
import "./index.scss"

// 课程模块儿公共组件
// 课程数量是奇数第一个课程需要横着展示沾满一行，课程数量是偶数一行显示两个

const HomeCourseList = function ({ modules, history }) {
  const toDetail = (id) => {
    history.push(`/detail?id=${id}`)
  }

  return (
    modules.length > 0 &&
    modules.map((module, i) => {
      return (
        <div key={i}>
          <Module module={module} toDetail={toDetail} />
          <p className="borderTop" />
        </div>
      )
    })
  )
}

const Module = function CourseList({ module, toDetail }) {
  let filterList = []
  let isOdd = module.list.length % 2 === 0

  if (module.name === "限时免费") {
    filterList = module.list
  } else {
    // 数量为奇数时，第一个课程显示大图（如后台未上传，前台显示小图），课程数量为偶数时，均显示小图

    if (isOdd) {
      filterList = module.list
    } else {
      filterList =
        module.list[0].course_img === module.list[0].course_img_small
          ? module.list
          : module.list.slice(1)
    }
  }

  return (
    <div className="category home-course-list">
      <h2 className="title">
        {module.name}
        {module.name === "限时免费" && <span className={"hot"}>hot</span>}
      </h2>

      {module.show_more === 1 && (
        <Link className="more" to="/classify">
          查看更多 &gt;
        </Link>
      )}
      {module.show_more === 2 ? (
        module.name === "限时免费" ? (
          <Link className="more" to={"/free"}>
            查看更多 &gt;
          </Link>
        ) : (
          <Link className="more" to={module.more_page}>
            查看更多 &gt;
          </Link>
        )
      ) : null}
      {/* <LazyLoad offset={50}> */}
      <ul className="index-course-detail">
        {module.name !== "限时免费" &&
          !isOdd &&
          module.list[0].course_img !== module.list[0].course_img_small && (
            <div
              className="category-vip"
              onClick={() => toDetail(module.list[0].course_id)}
            >
              <img src={module.list[0].course_img} alt="" />
            </div>
          )}
        {filterList.map((item, index) => {
          const top = item.is_limit_free ? null : (
            <div>
              {item.is_audition === true && (
                <span className="audition">
                  <i className={"iconfont iconerji"}></i>试听
                </span>
              )}
              {item.is_aist && <span className="return_bash"></span>}
            </div>
          )

          const bottom = <Bottom course={item} />

          const status = item.is_limit_free ? null : (
            <div>
              {item.is_bargain && (
                <p className="course-status">砍价减{item.bargain_price}元</p>
              )}
              {item.is_groupon && (
                <p className="course-status">拼团价{item.groupon_price}元</p>
              )}
            </div>
          )
          return (
            <Course
              key={index}
              top={top}
              data={item}
              bottom={bottom}
              status={status}
              img={item.course_img_small}
              title={item.course_title}
              id={item.course_id}
              toDetail={toDetail}
              className="text-overflow-2"
            />
          )
        })}
      </ul>
      {/* </LazyLoad> */}
    </div>
  )
}

//限时免费
function LimitFree({ course }) {
  /*
   *
   * limit_free_status: 0-未领取 1-已领取 2-已过期
   *
   * */
  switch (course.limit_free_status) {
    case 0:
      return (
        <Link to={`/detail?id=${course.course_id}`}>
          <p className={"course-price"}>
            <span className={"free"}>免费领取</span>
            <span className={"old"}>¥{course.price}</span>
          </p>
        </Link>
      )
    case 1:
      return <div className={"isbuy"}>已领取</div>
    default:
      return (
        <p className="course-price">
          <span className="new">¥{course.discounts_price}</span>
          <span className="old">¥{course.price}</span>
        </p>
      )
  }
}

//课程底部
function Bottom({ course }) {
  if (course.is_buy) {
    if (course.is_limit_free && course.limit_free_status === 1) {
      return <div class={"isbuy"}>已领取</div>
    } else {
      return <div className={"isbuy"}>已购买</div>
    }
  } else {
    return course.is_limit_free ? (
      <LimitFree course={course} />
    ) : (
      <p className="course-price">
        <span className="new">¥{course.discounts_price}</span>
        <span className="old">¥{course.price}</span>
      </p>
    )
  }
}

export default withRouter(HomeCourseList)