<template>
    <div class="app-container">
        <div class="flex flex-row justify-between items-center">
            <el-button icon="back" @click="router.back()">返回</el-button>
            <div class="flex-1 flex justify-center items-center">
                <el-text>{{ paperLocal.batchName }}</el-text>
                <el-input v-model="paperLocal.name" placeholder="输入试卷名称" class="ml-5" style="width: 220px"/>
            </div>
            <el-button type="primary" icon="select" @click="handleSavePaper">保存</el-button>
        </div>
        <el-divider/>
        <el-card v-for="(group, idx) in groupedQuestions" shadow="never" class="mb-5">
            <div :class="'drag_' + idx">
                <div slot="header" class="clearfix" @mouseover="showScore(group, idx)"
                     @mouseout="hideScore(group, idx)" draggable="true"
                     @dragstart="handleDragStart($event, group)"
                     @dragover.prevent="handleDragOver($event, group)"
                     @drop="handleDragEnter($event, group)" @dragend="handleDragEnd($event, group)">
                    <el-text class="font-bold">
                        {{ numberToChinese(idx + 1) }}、{{ group.title }}(共{{ group.num }}题;共{{ group.score }}分)
                    </el-text>
                    <span style="float: right; display: none" :id="'parent_score_' + idx">
            <el-button type="text" @click="openGroupScore=true,groupIdx=idx">批量设置得分</el-button>
            <el-button type="text" @click="deleteType(idx)">删除分类</el-button>
          </span>
                </div>
                <div v-for="(q, i) in group.list" class="mb-5"
                     @mouseover="showQuestionScore(idx, i)" @mouseout="hideQuestionScore(idx, i)"
                     @dragstart="handleQuestionDragStart($event, q, i)"
                     @dragover.prevent="handleQuestionDragOver($event, q)"
                     @drop="handleQuestionDragEnter($event, q, idx, i)"
                     @dragend="handleQuestionDragEnd($event, q)" draggable="true">
                    <div style="display: none" :id="'score_' + idx + '_' + i">
                        <el-button type="text" @click="openScore=true,groupIdx=idx,qIdx=i">
                            设置得分
                        </el-button>
                        <el-button type="text" @click="showQuestionParse(q)">解析</el-button>
                        <el-button type="text" @click="deleteQuestion(idx, i)">删除题目</el-button>
                    </div>
                    <div>
                        {{ i + 1 }}.
                        <span style="color: #1890ff">题号:{{ q.id }}（{{ q.score }}分）</span><span
                        v-html="q.title"></span>
                    </div>
                </div>
            </div>
        </el-card>

        <!-- 批量设置分数-->
        <el-dialog v-model="openGroupScore" width="500px" append-to-body>
            <el-form label-width="80px">
                <el-form-item label="分数" prop="parentScore">
                    <el-input-number v-model.number="groupScore" :min="1" placeholder="请输入分数"/>
                </el-form-item>
            </el-form>
            <div slot="footer" class="dialog-footer">
                <el-button type="primary" @click="setGroupScore">确 定</el-button>
                <el-button @click="openGroupScore=false">取 消</el-button>
            </div>
        </el-dialog>
        <!-- 设置题目分数 -->
        <el-dialog v-model="openScore" width="500px" append-to-body>
            <el-form label-width="80px">
                <el-form-item label="分数" prop="parentScore">
                    <el-input-number v-model.number="qScore" :min="1" placeholder="请输入分数"/>
                </el-form-item>
            </el-form>
            <div slot="footer" class="dialog-footer">
                <el-button type="primary" @click="setScore">确 定</el-button>
                <el-button @click="openScore=false">取 消</el-button>
            </div>
        </el-dialog>
        <!-- 设置题目解析 -->
        <el-dialog v-model="openParse" title="解析" width="70%" append-to-body center>
            <el-form label-width="80px" id="paperDialog">
                <el-form-item label="解析">
                    <editor v-model="parseCopy.parse" :min-height="122"/>
                </el-form-item>
                <el-form-item label="答案1">
                    <editor v-model="parseCopy.answer1" :min-height="122"/>
                </el-form-item>
                <el-form-item label="答案2">
                    <editor v-model="parseCopy.answer2" :min-height="122"/>
                </el-form-item>
            </el-form>
            <div slot="footer" class="dialog-footer">
                <el-button type="primary" @click="setQuestionParse">确 定</el-button>
                <el-button @click="openParse=false">取 消</el-button>
            </div>
        </el-dialog>
    </div>
</template>

<script setup name="PaperDetail">

import {usePaperResolver} from "@/views/dz/papers/hooks/usePaperStorage.js";
import router from "@/router/index.js";
import {ElMessage} from "element-plus";
import {buildPaperManual} from "@/api/dz/papers.js";

const {paperLocal, groupedQuestions, toCommitPaper} = usePaperResolver()

const chnNumChar = ["零", "一", "二", "三", "四", "五", "六", "七", "八", "九"];
const chnUnitSection = ["", "万", "亿", "万亿", "亿亿"];
const chnUnitChar = ["", "十", "百", "千"];

const groupIdx = ref(0)
const qIdx = ref(0)
const openGroupScore = ref(false)
const openScore = ref(false)
const groupScore = ref(1)
const qScore = ref(1)
const openParse = ref(false)
const parseQuestion = ref(null)
const parseCopy = ref(null)

const sectionToChinese = function (section) {
    let strIns = "", chnStr = "";
    let unitPos = 0;
    let zero = true;
    while (section > 0) {
        const v = section % 10;
        if (v === 0) {
            if (!zero) {
                zero = true;
                chnStr = chnNumChar[v] + chnStr;
            }
        } else {
            zero = false;
            strIns = chnNumChar[v];
            strIns += chnUnitChar[unitPos];
            chnStr = strIns + chnStr;
        }
        unitPos++;
        section = Math.floor(section / 10);
    }
    return chnStr;
}
const numberToChinese = function (num) {
    let unitPos = 0;
    let strIns = "", chnStr = "";
    let needZero = false;

    if (num === 0) {
        return chnNumChar[0];
    }

    while (num > 0) {
        const section = num % 10000;
        if (needZero) {
            chnStr = chnNumChar[0] + chnStr;
        }
        strIns = sectionToChinese(section);
        strIns +=
            section !== 0 ? chnUnitSection[unitPos] : chnUnitSection[0];
        chnStr = strIns + chnStr;
        needZero = section < 1000 && section > 0;
        num = Math.floor(num / 10000);
        unitPos++;
    }

    return chnStr;
}
const showQuestionParse = function (q) {
    openParse.value = true
    parseQuestion.value = q
    parseCopy.value = {...q}
}
const setQuestionParse = function () {
    openParse.value = false
    const {parse, answer1, answer2} = parseCopy.value
    parseQuestion.value.parse = parse
    parseQuestion.value.answer1 = answer1
    parseQuestion.value.answer2 = answer2
}
const showScore = function (data, index) {
    const doc = document.getElementById("parent_score_" + index);
    doc.style.display = "block";
}
const hideScore = function (data, index) {
    const doc = document.getElementById("parent_score_" + index);
    doc.style.display = "none";
}

const setGroupScore = function () {
    const group = groupedQuestions.value[groupIdx.value];
    const len = group.list.length;
    group.score = len * groupScore.value;
    for (let q of group.list) {
        q.score = groupScore.value;
    }
    openGroupScore.value = false;
}

const setScore = function () {
    const group = groupedQuestions.value[groupIdx.value]
    const q = group.list[qIdx.value]
    q.score = qScore.value
    group.score = group.list.reduce((a, b) => a + b.score, 0)
    openScore.value = false
}

const showQuestionScore = function (gIdx, qIdx) {
    const doc = document.getElementById("score_" + gIdx + "_" + qIdx);
    doc.style.display = "block";
}
const hideQuestionScore = function (gIdx, qIdx) {
    const doc = document.getElementById("score_" + gIdx + "_" + qIdx);
    doc.style.display = "none";
}
const deleteType = function (gIdx) {
    groupedQuestions.value.splice(gIdx, 1);
}
const deleteQuestion = function (gIdx, qIdx) {
    const group = groupedQuestions.value[gIdx]
    group.list.splice(qIdx, 1)
    if (group.list.length) {
        group.num = group.list.length
        group.score = group.list.reduce((a, b) => a + b.score, 0)
    } else {
        groupedQuestions.value.splice(gIdx, 1)
    }
}

// 拖动组
const draggingGroup = ref(null)
const handleDragStart = function (e, group) {
    draggingGroup.value = group
}
const handleDragEnd = function (e, group) {
    draggingGroup.value = null;
}
const handleDragOver = function (e) {
    e.dataTransfer.dropEffect = "move"; // e.dataTransfer.dropEffect="move";//在dragenter中针对放置目标来设置!
}
const handleDragEnter = function (e, group) {
    e.dataTransfer.effectAllowed = "move"; //为需要移动的元素设置dragstart事件
    if (group === draggingGroup.value) {
        return;
    }
    const newItems = groupedQuestions.value;
    const src = newItems.indexOf(draggingGroup.value);
    const dst = newItems.indexOf(group);

    newItems.splice(dst, 0, ...newItems.splice(src, 1))
}
// 拖动题
const draggingQuestion = ref(null)
const draggingQIdx = ref(0)
const handleQuestionDragStart = function (e, q, i) {
    draggingQuestion.value = q
    draggingQIdx.value = i
}
const handleQuestionDragEnd = function (e, q) {
    draggingQuestion.value = null
    draggingQIdx.value = null
}
const handleQuestionDragOver = function (e) {
    e.dataTransfer.dropEffect = "move"; // e.dataTransfer.dropEffect="move";//在dragenter中针对放置目标来设置!
}
const handleQuestionDragEnter = function (e, q, gIdx, qIdx) {
    e.dataTransfer.effectAllowed = "move"; //为需要移动的元素设置dragstart事件
    if (q === draggingQuestion.value && qIdx == draggingQIdx) {
        return;
    }
    const newItems = groupedQuestions.value[gIdx].list;
    const src = draggingQIdx.value;
    const dst = qIdx;

    newItems.splice(dst, 0, ...newItems.splice(src, 1));
}

const handleSavePaper = async function () {
    const commit = toCommitPaper()
    // validation
    if (!commit.name) return ElMessage.error('请填写试卷名称')
    if (!commit.questions?.length) return ElMessage.error('试卷至少包含1道试题')

    // save
    // TODO: 看看这个编辑有没有包含自动组卷的情况
    await buildPaperManual(commit)
    ElMessage.success('保存成功')
}
</script>

<style scoped>

</style>