<template>
    <v-container fluid class="body-color">
      <!-- ****** EDIT  Syllabus ****** -->
      <v-dialog v-model="editSyllabusDialog" max-width="400px">
        <v-card flat class="card-style pa-2" dark>
          <v-layout>
            <v-flex xs12>
              <label class="title text-xs-center">Edit Syllabus</label>
              <v-icon size="24" class="right" @click="editSyllabusDialog = false">cancel</v-icon>
            </v-flex>
          </v-layout>
          <v-container fluid>

            <v-form ref="formEditSyllabus" v-model="validEditSyllabus" lazy-validation>
              <v-layout>
                <v-flex xs4 sm4 class="pt-4 subheading">
                  <label class="right">Title :</label>
                </v-flex>
                <v-flex xs8 sm8 class="ml-3">
                  <v-text-field v-model="editedItem.title"></v-text-field>
                </v-flex>
              </v-layout>
              <v-layout>
                <v-flex xs4 class="pt-4 subheading">
                  <label class="right">Description:</label>
                </v-flex>
                <v-flex xs8 class="ml-3">
                  <v-text-field v-model="editedItem.description"></v-text-field>
                </v-flex>
              </v-layout>
              <v-layout>
                <v-flex xs4 class="pt-4 subheading">
                  <label class="right">Class:</label>
                </v-flex>
                <v-flex xs8 class="ml-3">
                  <v-select
                    :items="classList"
                    v-model="editedItem.classId"
                    label="Select Class"
                    item-text="classNum"
                    item-value="_id"
                    name="Select Class"

                    @change="getSections(addSyllabus.classId)"

                    required
                  ></v-select>
                </v-flex>
              </v-layout>

              <!-- <v-layout>
                <v-flex xs4 sm4 class="pt-4 subheading">
                  <label class="right">Section :</label>
                </v-flex>
                <v-flex xs8 sm8 class="ml-3">
                  <v-select
                    :items="addSection"
                    label="Select Section"
                    item-text="name"
                    item-value="_id"
                    v-model="editedItem.sectionId"
                    name="Select Section"
                    class="px-2"
                    required
                  ></v-select>
                </v-flex>

              </v-layout>-->

              <v-layout>
                <v-flex xs4 class="pt-4 subheading">
                  <label class="right">File:</label>
                </v-flex>
                <v-flex xs8 sm6 class="ml-3">
                  <v-text-field
                    label="Select file"
                    @click="pickFile"
                    v-model="imageName"
                    append-icon="attach_file"
                  ></v-text-field>

                </v-flex>
              </v-layout>
              <v-flex xs12 sm12>
                <v-card-actions>
                  <v-spacer></v-spacer>
                  <v-btn
                    round
                    dark
                    @click="save"
                    :loading="editLoading"
                    class="add-button"
                  >Update Syllabus</v-btn>
                </v-card-actions>
              </v-flex>
            </v-form>
          </v-container>
        </v-card>
      </v-dialog>
  
      <!-- ****** VIEW PROFIL NOTICE BOARD ******  -->

      <!-- <v-dialog v-model="viewSubjectDialog" max-width="600px">

        <v-toolbar flat class="card-style pa-3" dark>
          <v-spacer></v-spacer>
          <v-toolbar-title>
            <h3>Subject</h3>
          </v-toolbar-title>
          <v-spacer></v-spacer>
          <v-icon @click="close1">close</v-icon>
        </v-toolbar>
        <v-card>
          <v-card-text>
            <v-container grid-list-md>
              <v-layout wrap>
                <v-flex>
                  <v-layout>
                    <v-flex xs7 sm6>
                      <h5 class="right my-1">
                        <b>Subject Name:</b>
                      </h5>
                    </v-flex>
                    <v-flex sm6 xs5>
                      <h5 class="my-1">{{ editedItem.subjectName }}</h5>
                    </v-flex>
                  </v-layout>
                </v-flex>
              </v-layout>
            </v-container>
          </v-card-text>
        </v-card>

      </v-dialog>-->

  
      <!-- ****** EXISTING SYLLABUS TABLE ****** -->
      <v-toolbar color="transparent" flat>
        <v-btn
          fab
          dark
          class="open-dialog-button hidden-xl-only hidden-md-only hidden-lg-only"
          small
          @click="addSyllabusDialog = true"
        >
          <v-icon dark>add</v-icon>
        </v-btn>
        <v-flex xs1 class="hidden-sm-only hidden-xs-only">
          <v-btn round class="open-dialog-button" dark @click="addSyllabusDialog = true">
            <v-icon class="white--text pr-1" size="20">add</v-icon>Add Syllabus
          </v-btn>
        </v-flex>
        <v-spacer></v-spacer>
        <v-flex lg2 md2 xs12 v-show="show">
          <v-select
            :items="classList"
            label="Select Class"

            v-model="showSyllabus.classId"

            item-text="classNum"
            item-value="_id"
            name="Select Class"
            :rules="classRules"
            @change="getSyallabusList"
            class="pl-2"
            required
          ></v-select>
        </v-flex>
        <v-card-title class="body-1" v-show="show">
          <v-btn icon flat @click="displaySearch">
            <v-avatar size="27">
              <img src="/static/icon/search.png" alt="icon" />
            </v-avatar>
          </v-btn>
        </v-card-title>

        <v-flex xs9 sm9 md2 lg2 xl2 v-if="showSearch">

          <v-layout>
            <v-text-field

              autofocus

              v-model="search"
              label="Search"
              prepend-inner-icon="search"
              color="primary"
              style="transition: 0.8s cubic-bezier(0.25, 0.8, 0.25, 1); !important"
            ></v-text-field>
            <v-icon @click="closeSearch" color="error">close</v-icon>
          </v-layout>
        </v-flex>
      </v-toolbar>
      <v-data-table
        :headers="headers"
        :items="syllabusList"
        :pagination.sync="pagination"
        :search="search"
      >
        <template slot="items" slot-scope="props">
          <tr class="tr">
            <td class="td-row td">{{ props.index + 1 }}</td>
            <td class="text-xs-center td td-row">{{ props.item.title }}</td>
            <td class="text-xs-center td td-row">{{ props.item.description }}</td>
            <td class="text-xs-center td td-row">{{ dates(props.item.created) }}</td>

            <td
              class="text-xs-center td td-row"

              v-if="props.item.teacherId"

            >{{ props.item.teacherId.name }}</td>

            <td class="text-xs-center td td-row" v-else>{{ props.item.schoolId.name }}</td>

            <td class="text-xs-center td td-row">

              <v-btn

                class="add-button"
                @click="generatePDF2Canvas(props.item)"

                :loading="loadingPdf"
                dark
              >{{ props.item.fileType }}</v-btn>
            </td>

            <td class="text-xs-center td td-row">
              <span>

                <v-tooltip top>
                  <img
                    slot="activator"
                    style="cursor:pointer; width:20px; height:18px; "
                    class="mr-3"
                    @click="editItem(props.item)"
                    src="/static/icon/edit.png"
                  />
                  <span>Edit</span>
                </v-tooltip>
                <v-tooltip top>
                  <img
                    slot="activator"
                    style="cursor:pointer; width:20px; height:20px; "
                    class="mr-3"
                    @click="deleteItem(props.item)"
                    src="/static/icon/delete.png"
                  />
                  <span>Delete</span>
                </v-tooltip>
              </span>
            </td>
          </tr>
        </template>
        <v-alert
          slot="no-results"
          :value="true"
          color="error"
          icon="warning"
        >Your search for "{{ search }}" found no results.</v-alert>
      </v-data-table>
      <!-- ****** ADD SYLLABUS ****** -->
      <v-snackbar
        :timeout="timeout"
        :top="y === 'top'"
        :right="x === 'right'"
        :vertical="mode === 'vertical'"
        v-model="snackbar"
        :color="color"
      >{{ text }}</v-snackbar>

      <v-dialog v-model="addSyllabusDialog" max-width="400px" v-if="addSyllabusDialog">

        <v-card flat class="card-style pa-2" dark>
          <v-layout>
            <v-flex xs12>
              <label class="title text-xs-center">Add Syllabus</label>

              <v-icon size="24" class="right" @click="closeAddStudentModel">cancel</v-icon>

            </v-flex>
          </v-layout>
          <v-container fluid fill-height>

            <v-layout align-center>
              <v-flex xs12>
                <v-form ref="form" v-model="valid" lazy-validation>
                  <v-layout>
                    <v-flex xs4 sm4 class="pt-4 subheading">
                      <label class="right">Title :</label>
                    </v-flex>
                    <v-flex xs8 sm8 class="ml-3">
                      <v-text-field
                        v-model="addSyllabus.title"
                        name="name"
                        type="text"

                        placeholder="Add Title"

                        :rules="titleRules"
                        required
                      ></v-text-field>
                    </v-flex>
                  </v-layout>
                  <v-layout>
                    <v-flex xs4 sm4 class="pt-4 subheading">
                      <label class="right">Description :</label>
                    </v-flex>
                    <v-flex xs8 sm8 class="ml-3">
                      <v-text-field
                        v-model="addSyllabus.description"
                        name="name"
                        type="text"

                        placeholder="Add Description"

                        :rules="descriptionRules"
                        required
                      ></v-text-field>
                    </v-flex>
                  </v-layout>
                  <v-layout>
                    <v-flex xs4 class="pt-4 subheading">
                      <label class="right">Class:</label>
                    </v-flex>
                    <v-flex xs8 class="ml-3">
                      <v-select
                        :items="classList"
                        v-model="addSyllabus.classId"
                        label="Select Class"
                        item-text="classNum"
                        item-value="_id"
                        name="Select Class"

                        @change="getSections(addSyllabus.classId)"
                        required
                      ></v-select>
                    </v-flex>
                  </v-layout>

                  <!-- <v-layout>

                    <v-flex xs4 sm4 class="pt-4 subheading">
                      <label class="right">Section :</label>
                    </v-flex>
                    <v-flex xs8 sm8 class="ml-3">
                      <v-select
                        :items="addSection"
                        label="Select Section"
                        item-text="name"
                        item-value="_id"
                        v-model="addSyllabus.sectionId"
                        name="Select Section"
                        class="px-2"

                        required
                      ></v-select>
                    </v-flex>

                  </v-layout>-->

                  <v-layout>
                    <v-flex xs4 class="pt-4 subheading">
                      <label class="right">File:</label>
                    </v-flex>
                    <v-flex xs8 sm6 class="ml-3">
                      <v-text-field
                        label="Select file"
                        @click="pickFile"
                        v-model="imageName"
                        append-icon="attach_file"
                      ></v-text-field>
                      <input
                        type="file"
                        style="display:none"
                        ref="image"
                        accept="image/*"
                        @change="onFilePicked"
                      />
                    </v-flex>
                  </v-layout>
                  <v-layout>
                    <v-flex xs12 sm12>
                      <v-card-actions>
                        <v-spacer></v-spacer>
                        <v-btn
                          @click="submit"
                          round
                          dark
                          :loading="loading"
                          class="add-button"
                        >Add Syllabus</v-btn>
                      </v-card-actions>
                    </v-flex>
                  </v-layout>
                </v-form>
              </v-flex>
            </v-layout>
          </v-container>
        </v-card>
      </v-dialog>
      <div class="loader" v-if="showLoader">
        <v-progress-circular indeterminate color="white"></v-progress-circular>
      </div>
    </v-container>
  </template>
  
  <script>
  import http from "@/Services/http.js";
  import Util from "@/util";
  import moment from "moment";

  import jsPDF from "jspdf";

  import { saveAs } from "file-saver";

  
  export default {
    data: () => ({
      snackbar: false,
      y: "top",
      x: "right",
      mode: "",
      timeout: 3000,
      text: "",
      color: "",
      show: true,
      showSearch: false,
      showLoader: false,
      loading: false,
      editLoading: false,
      date: null,
      search: "",

      editSyllabusDialog: false,
      valid: true,
      validEditSyllabus: true,
      addSyllabusDialog: false,

      loadingPdf: false,

      pagination: {

        rowsPerPage: 10,

      },
      token: "",
      upload: "",

      titleRules: [(v) => !!v || " Title is required"],
      descriptionRules: [(v) => !!v || " Description is required"],
      classRules: [(v) => !!v || " Class Name is required"],
      fileRules: [(v) => !!v || " File is required"],

      headers: [
        {
          text: "No",
          align: "",
          sortable: false,

          value: "No",

        },
        {
          text: "Title",
          value: "title",
          sortable: false,

          align: "center",

        },
        {
          text: "Description",
          value: "description",
          sortable: false,

          align: "center",

        },
        {
          text: "Date",
          value: "created",
          sortable: false,

          align: "center",

        },
        {
          text: "Uploader",
          value: "upload",
          sortable: false,

          align: "center",

        },

        {
          text: "File",
          value: "documentUrl",
          sortable: false,

          align: "center",

        },

        { text: "Action", value: "", sortable: false, align: "center" },

      ],
      syllabusList: [],
      classList: [],

      addSection: [],

      editedIndex: -1,
      addSyllabus: {},

      showSyllabus: {},

      editedItem: {

        subjectName: "",

      },
      imageData: {},
      imageName: "",
      imageUrl: "",

      imageFile: "",

    }),

    watch: {
      addSyllabusDialog: function (val) {
        if (!val) {
          this.addSyllabus = [];
          this.imageName = "";
        }
      },
    },

    methods: {
      pickFile() {
        this.$refs.image.click();
      },

      dates: function (date) {

        return moment(date).format("MMMM DD, YYYY");
      },
      editItem(item) {
        this.editedIndex = this.syllabusList;
        this.editedItem = Object.assign({}, item);
        this.dialog = true;
        this.editSyllabusDialog = true;
      },

      download(item) {

        this.editedIndex = this.syllabusList;
        this.editedItem = Object.assign({}, item);
        this.dialog1 = true;

      },
      deleteItem(item) {
        let deleteSyallabus = {

          syallabusId: item._id,

        };
        http()
          .delete(
            "/deleteSyallabus",
            confirm("Are you sure you want to delete this?") && {

              params: deleteSyallabus,

            }
          )

          .then((response) => {

            this.getSyallabusList();
            this.snackbar = true;
            this.color = "green";
            this.text = "Successfully delete Existing Syllabus";
          })

          .catch((error) => {

            this.snackbar = true;
            this.text = error.response.data.message;
            this.color = "error";
          });
      },
      close() {
        this.editSyllabusDialog = false;
      },

      closeAddStudentModel() {
        this.addSyllabusDialog = false;

        //   this.syllabusList = [];

        this.addSyllabus = [];
        this.imageName = "";
      },

      submit() {
        // var addSyllabus = {
        //   classId: this.addSyllabus.classId,
        //   title: this.addSyllabus.title,
        //   description: this.addSyllabus.description,
        //   upload: this.addSyllabus.upload,
        //   fileType: this.addSyllabus.fileType
        // };

        var signatures = {
          JVBERi0: "other",
          iVBORw0KGgo: "image",
          UEsDBBQ: "other",
          "/": "image",
          AAABAA: "image",
          IywiV2hhdC: "other",

          bmFtZSxl: "other",

        };
        function detectMimeType(b64) {
          for (var s in signatures) {
            if (b64.indexOf(s) === 0) {
              return signatures[s];
            }
          }
        }

        if (this.$refs.form.validate()) {
          if (this.imageUrl) {
            var str = this.imageUrl;
            const [baseUrl, imageUrl] = str.split(/,/);
            this.addSyllabus.upload = imageUrl;

            this.addSyllabus.fileType = detectMimeType(imageUrl);

            this.addSyllabus.fileName = this.imageName;

          }
          http()
            .post("/createSyallabus", this.addSyllabus)

            .then((response) => {

              this.getSyallabusList();
              this.snackbar = true;
              this.text = "Syllabus added successfully";
              this.clear();
              this.color = "green";
              this.addSyllabusDialog = false;
            })

            .catch((error) => {

              // console.log(error);
              this.snackbar = true;
              this.text = error.response.data.message;
              this.color = "error";
            });
        }
      },
      onFilePicked(e) {

        const files = e.target.files;
        this.upload = e.target.files[0];

        if (files[0] !== undefined) {
          this.imageName = files[0].name;
          if (this.imageName.lastIndexOf(".") <= 0) {
            return;
          }
          const fr = new FileReader();
          fr.readAsDataURL(files[0]);
          fr.addEventListener("load", () => {
            this.imageUrl = fr.result;
            this.imageFile = files[0]; // this is an image file that can be sent to server...
            this.imageData.imageUrl = URL.createObjectURL(this.imageFile);

          });
        } else {
          this.imageName = "";
          this.imageFile = "";
          this.imageUrl = "";
        }
      },
      clear() {
        this.$refs.form.reset();
      },
      save() {
        if (this.$refs.formEditSyllabus.validate()) {
          let syllabusData = {
            syallabusId: this.editedItem._id,

            classId: this.editedItem.classId._id,
            // sectionId: this.editedItem.sectionId,
            title: this.editedItem.title,
            description: this.editedItem.description,
            upload: this.editedItem.upload,

            fileType: this.editedItem.fileType,

            fileName: this.imageName,

          };
          this.editLoading = true;

          var signatures = {
            JVBERi0: "other",
            iVBORw0KGgo: "image",
            UEsDBBQ: "other",
            "/": "image",
            AAABAA: "image",

            IywiV2hhdC: "other",

          };
          function detectMimeType(b64) {
            for (var s in signatures) {
              if (b64.indexOf(s) === 0) {
                return signatures[s];
              }
            }
          }
          if (this.imageUrl) {
            var str = this.imageUrl;
            const [baseUrl, imageUrl] = str.split(/,/);
            syllabusData.upload = imageUrl;
            syllabusData.fileType = detectMimeType(imageUrl);
          }

          http()
            .put("/updateSyallabus", syllabusData)

            .then((response) => {

              this.snackbar = true;
              this.text = "Successfully Edit Existing Syllabus";
              this.color = "green";
              this.editLoading = false;
              this.editSyllabusDialog = false;
              http()
                .get(
                  "/getSyallabusList",
                  { params: { classId: this.addSyllabus.classId } },
                  {

                    headers: { Authorization: "Bearer " + this.token },

                  }
                )

                .then((response) => {

                  this.syllabusList = response.data.data;
                  this.getSyallabusList();
                  this.snackbar = true;
                  this.color = "green";
                  this.close();
                })

                .catch((err) => {

                  console.log("err====>", err);
                  this.text = error.response.data.message;
                  this.color = "error";
                });
            })

            .catch((error) => {

              this.editLoading = false;
            });
        }
      },
      getSyallabusList() {
        this.showLoader = true;
        http()
          .get(
            "/getSyallabusList",

            { params: { classId: this.showSyllabus.classId } },

            {

              headers: { Authorization: "Bearer " + this.token },

            }
          )

          .then((response) => {

            this.syllabusList = response.data.data;
            this.showLoader = false;
          })

          .catch((err) => {

            this.showLoader = false;
          });
      },
      getClass() {
        http()
          .get("/getClassesList", {

            headers: { Authorization: "Bearer " + this.token },

          })

          .then((response) => {

            this.classList = response.data.data;
          })

          .catch((error) => {

            if (error.response.status === 401) {
              this.$router.replace({ path: "/" });
              this.$store.dispatch("setToken", null);
              this.$store.dispatch("Id", null);
            }
          });
      },

      getSections(_id) {
        var token = this.$store.state.token;
        this.showLoader = true;
        http()
          .get(
            "/getSectionsList",
            { params: { classId: _id } },
            {

              headers: { Authorization: "Bearer " + token },

            }
          )

          .then((response) => {

            this.addSection = response.data.data;
            this.showLoader = false;
          })

          .catch((err) => {

            this.showLoader = false;
          });
      },

      displaySearch() {
        (this.show = false), (this.showSearch = true);
      },
      closeSearch() {
        this.showSearch = false;
        this.show = true;
        this.search = "";

      },

      async generatePDF2Canvas(item) {
        // console.log("documentUrl", documentUrl);
        // this.loadingPdf = true;
        // const el = this.$refs.printMe;
        // add option type to get the image version
        // if not provided the promise will return
        // the canvas.
        // const options = {
        //   type: "dataURL"
        // };
        // this.output = await this.$html2canvas(el, options);
        // console.log("el,option", this.output);
        // if (this.output) {
        //   this.loadingPdf = false;
        // }
        // let doc = new jsPDF();
        // doc.addImage(this.output,"JPEG", 5, 10, 200, 280);
        // doc.save("File.pdf");
  
        // function download(documentUrl, filename) {
        //   fetch(documentUrl).then(function(t) {
        //     return t.blob().then(b => {
        //       var a = document.createElement("a");
        //       a.href = URL.createObjectURL(b);
        //       a.setAttribute("download", "filename");
        //       a.click();
        //     });
        //   });
        // }
        var dataType = "";
        var type = "";
        if (item.fileType == "image") {
          dataType = "file.jpg";
        } else if (item.fileType == "other") {
          dataType = "file.pdf";
          type = "application/pdf";
        }
        var FileSaver = require("file-saver");
        FileSaver.saveAs(item.documentUrl, "image.jpg");
  
        // var blob = new Blob([item.documentUrl], {
        //   type: type
        // });
        // FileSaver.saveAs(blob, dataType);
        // const url = window.URL.createObjectURL(new Blob([item.documentUrl],{ type: type } ));
        // console.log("document", item.documentUrl);
        // const link = document.createElement("a");
        // link.href = url;
        // link.setAttribute("download", dataType); //or any other extension
        // document.body.appendChild(link);
        // link.click();
  
        //  const blob = window.URL.createObjectURL(new Blob([item.documentUrl],{ type: type } ));
        //   const link = document.createElement('a')
        //   link.href = URL.createObjectURL(blob)
        //   link.download = dataType
        //   link.click()
        //   URL.revokeObjectURL(link.href)

      },

    },
    mounted() {
      this.token = this.$store.state.token;
      this.role = this.$store.state.role;
      this.getClass();

    },

  };
  </script>