<template>
    <div>
        <div style="margin: 10px 0">
            <el-input style="width: 200px" placeholder="请输入名称" suffix-icon="el-icon-search" v-model="name"></el-input>
            <el-button class="ml-5" type="primary" @click="load">搜索</el-button>
            <el-button type="warning" @click="reset">重置</el-button>
        </div>
        <div style="margin: 10px 0">
            <el-button type="primary" @click="handleAdd" v-if="user.role === 'admin'">新增 <i class="el-icon-circle-plus-outline"></i></el-button>
            <el-popconfirm
                    class="ml-5"
                    confirm-button-text='确定'
                    cancel-button-text='我再想想'
                    icon="el-icon-info"
                    icon-color="red"
                    title="您确定批量删除这些数据吗？"
                    @confirm="delBatch"
            >
                <el-button type="danger" slot="reference" v-if="user.role === 'admin'">批量删除 <i class="el-icon-remove-outline"></i></el-button>
            </el-popconfirm>

        </div>
        <el-table :data="tableData" border stripe :header-cell-class-name="'headerBg'"  @selection-change="handleSelectionChange">
            <el-table-column type="selection" width="55"></el-table-column>
            <el-table-column prop="id" label="ID" width="80"></el-table-column>
            <el-table-column prop="name" label="课程名称"></el-table-column>
            <el-table-column prop="score" label="学分"></el-table-column>
            <el-table-column prop="times" label="课时"></el-table-column>
            <el-table-column prop="teacher" label="授课老师"></el-table-column>
            <el-table-column label="操作"  width="300" align="center">
                <template slot-scope="scope">
                    <el-button type="primary" @click="selectCourse(scope.row.id)">选课</el-button>
                    <el-button type="success" @click="handleEdit(scope.row)" v-if="user.role === 'admin'">编辑 <i class="el-icon-edit"></i></el-button>
                    <el-popconfirm
                            class="ml-5"
                            confirm-button-text='确定'
                            cancel-button-text='我再想想'
                            icon="el-icon-info"
                            icon-color="red"
                            title="您确定删除吗？"
                            @confirm="del(scope.row.id)"
                    >

                        <el-button type="danger" slot="reference" v-if="user.role === 'admin'">删除 <i class="el-icon-remove-outline"></i></el-button>
                    </el-popconfirm>
                </template>
            </el-table-column>
        </el-table>

        <div style="padding: 10px 0">
            <el-pagination
                    @size-change="handleSizeChange"
                    @current-change="handleCurrentChange"
                    :current-page="pageNum"
                    :page-sizes="[2, 5, 10, 20]"
                    :page-size="pageSize"
                    layout="total, sizes, prev, pager, next, jumper"
                    :total="total">
            </el-pagination>
        </div>
        <el-dialog title="课程信息" :visible.sync="dialogFormVisible" width="30%" >
            <el-form label-width="80px" size="small">
                <el-form-item label="名称">
                    <el-input v-model="form.name" autocomplete="off"></el-input>
                </el-form-item>
                <el-form-item label="学分">
                    <el-input v-model="form.score" autocomplete="off"></el-input>
                </el-form-item>
                <el-form-item label="课时">
                    <el-input v-model="form.times" autocomplete="off"></el-input>
                </el-form-item>
                <el-form-item label="老师">
                    <el-select clearable v-model="form.teacherId" placeholder="请选择">
                        <el-option v-for="item in teachers" :key="item.id" :label="item.nickname" :value="item.id"></el-option>
                    </el-select>
                </el-form-item>
            </el-form>
            <div slot="footer" class="dialog-footer">
                <el-button @click="dialogFormVisible = false">取 消</el-button>
                <el-button type="primary" @click="save">确 定</el-button>
            </div>
        </el-dialog>
    </div>
</template>

<script>
    export default {
        name: "Course",
        data() {
            return {
                tableData: [],
                name: '',
                multipleSelection: [],
                pageNum: 1,
                pageSize: 10,
                total: 0,
                dialogFormVisible: false,
                form: {},
                teachers: [],
                user: localStorage.getItem("user") ? JSON.parse(localStorage.getItem("user")) : {}
            }
        },
        created() {
            this.load()
        },
        methods: {
            load() {
                this.request.get("/course/page", {
                    params: {
                        pageNum: this.pageNum,
                        pageSize: this.pageSize,
                        name: this.name,
                    }
                }).then(res => {

                    this.tableData = res.data.records
                    this.total = res.data.total

                })
                this.request.get("/user/role/teacher").then(res => {
                    this.teachers = res.data
                })

            },
            selectCourse(courseId) {
                this.request.post('/course/studentCourse/' + courseId + "/" + this.user.id).then(res => {
                    if (res.code === '200') {
                        this.$message.success("选课成功")
                    } else {
                        this.$message.success(res.msg)
                    }
                })
            },
            changeEnable(row) {
                this.request.post("/course/update", row).then(res => {
                    if (res.code === '200') {
                        this.$message.success("操作成功")
                    }
                })
            },
            del(id) {
                this.request.delete("/course/" + id).then(res => {
                    if (res.code === '200') {
                        this.$message.success("删除成功")
                        this.load()
                    } else {
                        this.$message.error("删除失败")
                    }
                })
            },
            handleSelectionChange(val) {
                console.log(val)
                this.multipleSelection = val
            },
            delBatch() {
                let ids = this.multipleSelection.map(v => v.id)  // [{}, {}, {}] => [1,2,3]
                this.request.post("/course/del/batch", ids).then(res => {
                    if (res.code === '200') {
                        this.$message.success("批量删除成功")
                        this.load()
                    } else {
                        this.$message.error("批量删除失败")
                    }
                })
            },
            handleAdd() {
                this.dialogFormVisible = true
                this.form = {}
            },
            handleEdit(row) {
                this.form = JSON.parse(JSON.stringify(row))
                this.dialogFormVisible = true
            },
            save() {
                this.request.post("/course", this.form).then(res => {
                    if (res.code === '200') {
                        this.$message.success("保存成功")
                        this.dialogFormVisible = false
                        this.load()
                    } else {
                        this.$message.error("保存失败")
                    }
                })
            },
            reset() {
                this.name = ""
                this.load()
            },
            handleSizeChange(pageSize) {
                console.log(pageSize)
                this.pageSize = pageSize
                this.load()
            },
            handleCurrentChange(pageNum) {
                console.log(pageNum)
                this.pageNum = pageNum
                this.load()
            },
            handleFileUploadSuccess(res) {
                console.log(res)
                this.load()
            },

        }
    }
</script>

<style scoped>

</style>