<template>
    <div>

      <!-- LOADER -->
      <div class="loader" v-if="showLoader">
        <v-progress-circular indeterminate color="white"></v-progress-circular>
      </div>
  
      <!-- SNACKBAR -->
      <v-snackbar
        :timeout="timeout"
        :top="y === 'top'"
        :right="x === 'right'"
        :vertical="mode === 'vertical'"
        v-model="snackbar"
        :color="snackbarColor"
      >
        {{ text }}
        <v-spacer></v-spacer>
        <v-btn flat text @click="snackbar = false">X</v-btn>
      </v-snackbar>

      <v-container class="pt-0">

        <v-layout row class="mt-1">

          <v-flex xs8>
            <!-- CHAPTER INFO -->
            <div class="title side-bar-color font-weight-bold">{{chapter.chapters[0].chapterName}}</div>
            <div class="subheading grey--text lighten-1">{{chapter.chapters[0].description}}</div>
            <div
              v-for="(point,index) in chapter.chapters[0].chapterPoints"
              :key="index"
              class="ml-2 mt-2"
            >
              <span class="subheading grey--text lighten-1">{{index +1}}. {{point}}</span>
            </div>
            <!-- ACTIVITIES -->
            <div class="mt-5">
              <v-icon>library_books</v-icon>
              <span class="subheading font-weight-bold">Activities</span>
            </div>
            <!-- OTHER OPTIONS -->
            <div class="mt-5">
              <ul class="subheading">
                <li>Live online classes solution</li>
                <li>Tutorial-pharmacetutical</li>
                <li>HSP Interactive content</li>
                <li>Assessment</li>
              </ul>
            </div>

            <!-- SELECT CHAPTERS -->
            <v-layout row class="mt-5">
              <!-- PREVIOUS CHAPTER -->
              <v-flex
                style="cursor: pointer;"
                class="subheading font-weight-bold text-xs-left"
                v-if="indexSelectedChapter > 0"
                @click="showSelectedChapter('back')"
              >
                <v-icon class="black--text" style="position:relative; top: 4px;">chevron_left</v-icon>
                {{chapterNames[indexSelectedChapter - 1]}}
              </v-flex>
              <v-spacer></v-spacer>
              <!-- NEXT CHAPTER -->
              <v-flex
                style="cursor: pointer;"
                class="subheading font-weight-bold text-xs-right"
                v-if="indexSelectedChapter < chapterNames.length -1"
                @click="showSelectedChapter('forward')"
              >

                {{chapterNames[indexSelectedChapter + 1]}}
                <v-icon class="black--text" style="position:relative; top: 4px;">chevron_right</v-icon>

              </v-flex>
            </v-layout>

            <!-- <v-flex class="text-xs-right mt-5" v-else>
              <span class="subheading font-weight-bold">Return to chapter one</span>
            </v-flex>-->
          </v-flex>
  
          <v-spacer></v-spacer>
  
          <!-- COURSES - positioned to the right of the page -->
          <v-flex xs3>
            <v-card class="elevation-0 card-border" height="100%">
              <v-container class="pt-0">
                <div class="side-bar-color font-weight-bold title">Courses</div>

                <div v-for="(course,index) in courseData" :key="index">
                  <v-btn
                    flat
                    class="subheading text-xs-start justify-left"
                    style="cursor: pointer;"
                    block
                    @click="routeToCourseDetails(course._id)"
                  >
                    <div style="width: 100%;text-align: left;">
                      <v-icon style="color: red;padding-bottom: 3px;" size="15">play_arrow</v-icon>

                      {{course.courseName}}

                    </div>
                  </v-btn>

                </div>
              </v-container>
            </v-card>
          </v-flex>
        </v-layout>
      </v-container>

    </div>
  </template>
  <script>
  import http from "@/Services/http.js";

  import AllApiCalls from "@/Services/AllApiCalls.js";

  export default {

    mixins: [AllApiCalls],

    data() {
      return {

        // courseData: [],

        showLoader: false,
        chapter: { chapters: [{}] },
        chapterNames: [],
        chapterIds: [],
        selectedChapterId: "",
        indexSelectedChapter: ""
      };
    },
    methods: {

      showSelectedChapter(newChapter) {
        if (newChapter == "forward") {
          this.indexSelectedChapter += 1;
          this.selectedChapterId = this.chapterIds[this.indexSelectedChapter];
          this.getParticularChapterDetail();
        }
        if (newChapter == "back") {
          this.indexSelectedChapter -= 1;
          this.selectedChapterId = this.chapterIds[this.indexSelectedChapter];
          this.getParticularChapterDetail();
        }

      },
      getParticularChapterDetail() {
        http()
          .get("/getParticularChapterDetail", {
            params: {
              courseDetailId: this.$route.query.courseDetailId,
              chapterId: this.selectedChapterId
            }
          })
          .then(response => {
            this.chapter = response.data.data;
            console.log(" chapter data - ", this.chapter);
            this.showLoader = false;
          })
          .catch(err => {
            console.log("err====>", err);
            this.showLoader = false;
          });

      },
      async routeToCourseDetails(courseId) {
        /* getParticularCourseDetail- To get courseDetail - defined in GetApis.js*/
        let response = await this.getParticularCourseDetail(courseId);
  
        /* If the response is null then dont route */
        if (response.data.data.length > 0) {
          this.$router.push({
            name: "Course Details",
            query: { courseId: courseId }
          });
        } else {
          this.seeSnackbar("No Data Available", "warning");
        }

      }
    },
    // computed:{
    //   nextChapterIndex(){
  
    //   }
    // }

    async created() {

      console.log("route query - ", this.$route.query);
  
      this.selectedChapterId = this.$route.query.chapterId;
  
      /* set chapterNames array */
      this.chapterNames = Object.keys(this.$route.query);
      this.chapterNames.pop();
      this.chapterNames.pop();
      console.log("chapter names - ", this.chapterNames);
  
      /* set chapter Ids */
      this.chapterIds = Object.values(this.$route.query);
      this.chapterIds.pop();
      this.chapterIds.pop();
      console.log("chapter Ids - ", this.chapterIds);
  
      this.indexSelectedChapter = this.chapterIds.findIndex(id => {
        return id == this.selectedChapterId;
      });
      console.log(" index of selected chapter - ", this.indexSelectedChapter);
  
      /* get chapter clicked on using the id */

      await this.getParticularChapterDetail(this.selectedChapterId);

      /* getStudentCourses - to get courseData - defined in GetApis.js*/
      await this.getStudentCourses({
        classId: localStorage.getItem("parentClassId"),
        studentId: localStorage.getItem("parentStudentId")
      });

    }
  };
  </script>
  <style scoped>
  .side-bar-color {
    color: #827bfa !important;
    /* border-top-right-radius: 74px !important; */
  }
  .card-border {
    border: 1px #bdbdbd solid;
    border-radius: 3px;
  }
  </style>