<template>
  <div id="Chapter1_1" class="content-wrap">
    <div style="margin: 30px 0px 50px; width: 20%">
      <router-link to="/MyPlan.page">
        <div class="logo mb25">
          <img src="../../../../resources/img/new_img/logo_v2.png" alt="" />
        </div>
      </router-link>
    </div>
    <div
      class="title-box mb25 flex align-center mt40"
      style="justify-content: space-between"
    >
      <div>
        <span class="title mr40">1. Hello WORLD</span>
        <span class="subtitle">my name is dd</span>
      </div>
      <button class="completeBtn" @click="complete">학습 종료</button>
    </div>
    <div class="flex justify-between align-center">
      <div
        class="pre-btn"
        :style="{ visibility: hiddenState ? 'hidden' : 'visible' }"
        @click="previousProblem()"
      >
        <img src="../../../../resources/img/left.png" alt="" />
      </div>
      <div class="content title-box">
        <div style="display: flex; justify-content: space-between">
          <p class="title mt25 title-bg">step3 - 놀면서 배우는 영어</p>
          <button id="returnButton" @click="returnPage" style="margin: 4rem">
            <img src="../../../../resources/img/btn_return_50x50.png" alt="" />
            <p>되돌리기</p>
          </button>
        </div>
        <div class="flex align-center mb30">
          <p class="subtitle2 mr20">
            앗! 다리가 무너져서 건널 수가 없어! 다리 조각을 옮겨줘!
          </p>
        </div>

        <div class="text-ct flex justify-center" style="gap: 80px">
          <div class="dropGroup flex align-center justify-center">
            <div class="flex" style="gap: 20px; position: relative">
              <img src="../../../../resources/img/img70_39s.png" alt="" />
              <div class="textbox">
                <p
                  v-if="problemArr.length > 0"
                  style="left: -180px; bottom: -200px"
                >
                  {{ problemArr[0] }}
                </p>
                <p
                  v-if="problemArr.length > 1"
                  id="bridgeTarget"
                  style="left: -105px; bottom: -150px"
                  @dragover.prevent
                  @drop="handleDrop"
                >
                  {{ problemArr[1] }}
                </p>
                <p
                  v-if="problemArr.length > 2"
                  style="left: -30px; bottom: -65px"
                >
                  {{ problemArr[2] }}
                </p>
              </div>
            </div>
          </div>
          <div class="dragGroup mt40">
            <div>
              <button
                v-if="answerArr.length > 0 && answerArr[0].prblmDtlExpln"
                :id="answerArr[0].prblmDtlExpln"
                draggable="true"
                @dragstart="handleDragStart"
              >
                <img src="../../../../resources/img/img71_39s.png" alt="" />
                <p>{{ answerArr[0].prblmDtlExpln }}</p>
              </button>
              <button
                v-if="answerArr.length > 1 && answerArr[1].prblmDtlExpln"
                :id="answerArr[1].prblmDtlExpln"
                draggable="true"
                @dragstart="handleDragStart"
              >
                <img src="../../../../resources/img/img71_39s.png" alt="" />
                <p>{{ answerArr[1].prblmDtlExpln }}</p>
              </button>
              <button
                v-if="answerArr.length > 2 && answerArr[2].prblmDtlExpln"
                :id="answerArr[2].prblmDtlExpln"
                draggable="true"
                @dragstart="handleDragStart"
              >
                <img src="../../../../resources/img/img71_39s.png" alt="" />
                <p>{{ answerArr[2].prblmDtlExpln }}</p>
              </button>
            </div>
          </div>
        </div>
      </div>
      <div class="next-btn" @click="nextProblem()">
        <img src="../../../../resources/img/right.png" alt="" />
      </div>
    </div>
  </div>
</template>

<script>
import axios from "axios";

export default {
  data() {
    return {
      draggedElementId: null, // 드래그한 요소의 ID를 저장
      correctAnswer: "", // 정답 설정
      prblm_id: [],
      problemData: [],
      problemArr: [],
      answerArr: [],

      seq: this.$store.getters.seqNum,
      hiddenState: false,
    };
  },
  methods: {
    complete() {
      const { unit_id, book_id } = this.$route.query;
      this.$router.push({
        name: "Dashboard",
        query: { value: this.seq, unit_id, book_id },
      });
    },
    goToPage(page) {
      this.$router.push({ name: page });
    },
    returnPage() {
      // 페이지 새로 고침
      window.location.reload();
    },
    handleDragStart(event) {
      // 드래그한 요소의 ID를 저장
      this.draggedElementId = event.target.id;
    },
    handleDrop(event) {
      const dropZone = event.target;
      const draggedElement = document.getElementById(this.draggedElementId);

      if (draggedElement) {
        // 새로운 버튼을 드롭 영역에 추가
        const cloneElement = draggedElement.cloneNode(true);
        cloneElement.style.position = "absolute";
        cloneElement.style.top = "-70px";
        cloneElement.style.left = "-50px";
        dropZone.innerHTML = ""; // 기존 ? 텍스트 제거
        dropZone.appendChild(cloneElement);

        // DOM 업데이트 후 알림을 비동기적으로 처리
        setTimeout(() => {
          if (this.draggedElementId === this.correctAnswer) {
            alert("정답입니다!");
            this.nextProblem();
          } else {
            alert("오답입니다!");
            draggedElement.style.visibility = "visible"; // 다시 보이게 하기
            dropZone.innerHTML = "?"; // 드롭된 영역 초기화
          }

          // 드래그 상태 초기화
          this.draggedElementId = null;
        }, 0);
      }
    },

    fetchProblemData() {
      axios({
        url: "/problem/problemInfo.json",
        method: "post",
        headers: {
          "Content-Type": "application/json; charset=UTF-8",
        },
        data: {
          prblmId: this.prblm_id.prblm_id,
        },
      })
        .then((response) => {
          this.problemData = response.data;
          console.log("problemData", this.problemData);
          this.sortingProblem();
        })
        .catch((error) => {
          this.state = "noProblem";
          console.error("Error fetching problemData:", error);
        });
    },
    sortingProblem() {
      let prblmExpln = this.problemData.problem.prblmExpln;
      let prblmArr = prblmExpln.split("/");
      this.problemArr = prblmArr;

      for (let i = 0; i < this.problemData.problemDetail.length; i++) {
        // this.answerArr[i].prblmDtlExpln =
        //   this.problemData.problemDetail[i].prblmDtlExpln;
        // this.answerArr[i].prblmYn = this.problemData.problemDetail[i].prblmYn;
        this.answerArr[i] = this.problemData.problemDetail[i];
      }
      console.log("answerArr", this.answerArr);

      for (let i = 0; i < this.answerArr.length; i++) {
        if (this.answerArr[i].prblmYn == "Y") {
          this.correctAnswer = this.answerArr[i].prblmDtlExpln;
          break;
        }
      }

      // for (let i = prblmArr.length - 1; i > 0; i--) {
      //   const j = Math.floor(Math.random() * (i + 1));
      //   [prblmArr[i], prblmArr[j]] = [prblmArr[j], prblmArr[i]];
      // }

      // this.prblmArr = prblmArr;
      // console.log(prblmArr);
    },

    nextProblem() {
      if (
        this.currentProblemIndex <
        this.$store.state.currentLearningIds.length - 1
      ) {
        this.$store.dispatch("goToNextProblem");
        this.handleProblemDetail(this.currentLearningId);
        this.goToPage(this.problemType);
      } else {
        // 마지막 문제면 이동
        // this.goToPage("Chapter4");
        alert("문제 학습 완료");
        this.complete();
      }
    },
    previousProblem() {
      if (this.currentProblemIndex > 0) {
        this.$store.dispatch("goToPreviousProblem");
        this.handleProblemDetail(this.currentLearningId);
        this.goToPage(this.problemType);
      }
    },

    handleProblemDetail(item) {
      if (item.prblm_type_id === "prblm_type_001") {
        this.problemType = "Chapter3";
      } else if (item.prblm_type_id === "prblm_type_002") {
        this.problemType = "Chapter3_1";
      } else if (item.prblm_type_id === "prblm_type_003") {
        this.problemType = "Chapter3_2";
      } else if (item.prblm_type_id === "prblm_type_004") {
        this.problemType = "Chapter3_3";
      } else if (item.prblm_type_id === "prblm_type_005") {
        this.problemType = "Chapter3_3_1";
      } else if (item.prblm_type_id === "prblm_type_006") {
        this.problemType = "Chapter3_4";
      } else if (item.prblm_type_id === "prblm_type_007") {
        this.problemType = "Chapter3_5";
      } else if (item.prblm_type_id === "prblm_type_008") {
        this.problemType = "Chapter3_6";
      } else if (item.prblm_type_id === "prblm_type_009") {
        this.problemType = "Chapter3_7";
      } else if (item.prblm_type_id === "prblm_type_010") {
        this.problemType = "Chapter3_8";
      } else if (item.prblm_type_id === "prblm_type_011") {
        this.problemType = "Chapter3_9";
      } else if (item.prblm_type_id === "prblm_type_012") {
        this.problemType = "Chapter3_10";
      } else if (item.prblm_type_id === "prblm_type_013") {
        this.problemType = "Chapter3_11";
      } else if (item.prblm_type_id === "prblm_type_014") {
        this.problemType = "Chapter3_12";
      } else if (item.prblm_type_id === "prblm_type_015") {
        this.problemType = "Chapter3_13";
      } else if (item.prblm_type_id === "prblm_type_016") {
        this.problemType = "Chapter3_14";
      } else if (item.prblm_type_id === "prblm_type_017") {
        this.problemType = "Chapter3_15";
      } else if (item.prblm_type_id === "prblm_type_018") {
        this.problemType = "Chapter2_8";
      } else if (item.prblm_type_id === "prblm_type_019") {
        this.problemType = "Chapter2_7";
      } else if (item.prblm_type_id === "prblm_type_020") {
        this.problemType = "Chapter2_5";
      } else if (item.prblm_type_id === "prblm_type_021") {
        this.problemType = "Chapter2_6";
      } else if (item.prblm_type_id === "prblm_type_022") {
        this.problemType = "Chapter2_10";
      } else if (item.prblm_type_id === "prblm_type_023") {
        this.problemType = "Chapter2_11";
      } else if (item.prblm_type_id === "prblm_type_024") {
        this.problemType = "Chapter2_13";
      }
    },
  },
  computed: {
    currentLearningId() {
      return this.$store.getters.currentLearningId;
    },
    currentLabel() {
      return this.$store.getters.currentLabel;
    },
    currentProblemIndex() {
      return this.$store.getters.currentProblemIndex;
    },
    isPreviousButtonDisabled() {
      return this.currentProblemIndex === 0;
    },
  },
  created() {
    console.log("Current Learning ID:", this.currentLearningId);
    this.prblm_id = this.currentLearningId;
    console.log("Current Label:", this.currentLabel);
    console.log("Current Problem Index:", this.currentProblemIndex);

    // Fetch or process the current problem based on `currentLearningId`
  },
  mounted() {
    this.fetchProblemData();
    if (this.currentProblemIndex == 0) {
      this.hiddenState = true;
    }
  },
};
</script>

<style scoped>
.textbox p {
  position: absolute;
}

.dragGroup button {
  display: block;
}

.dragGroup button p,
.textbox p {
  width: fit-content;
  height: fit-content;
  background: #ffffffb8;
  border-radius: 5px;
  padding: 10px;
  font-size: 30px;
  font-family: "ONEMobilePOP";
}

.dragGroup button {
  cursor: grab;
}

.dragGroup button[draggable="true"]:active {
  cursor: grabbing;
}

.completeBtn {
  margin-right: 100px;
  background-color: #ffba08;
  padding: 10px 30px;
  border-radius: 10px;
  font-size: 28px;
  font-family: "ONEMobilePOPOTF";
}
</style>
