<template>
    <div class="createPost-container">
      <el-form ref="postForm" :model="postForm" :rules="rules" class="form-container">
        <sticky :z-index="10" :class-name="'sub-navbar '+postForm.status">
          <CommentDropdown v-model="postForm.comment_disabled" />
          <PlatformDropdown v-model="postForm.platforms" />
          <SourceUrlDropdown v-model="postForm.source_uri" />
          <el-button v-loading="loading" style="margin-left: 10px;" type="success" @click="submitForm">
            Publish
          </el-button>
          <el-button v-loading="loading" type="warning" @click="draftForm">
            Draft
          </el-button>
        </sticky>
  
        <div class="createPost-main-container">
          <el-row>
            <Warning />
  
            <el-col :span="24">
              <el-form-item style="margin-bottom: 40px;" prop="title">
                <MDinput v-model="postForm.title" :maxlength="100" name="name" required>
                  Title
                </MDinput>
              </el-form-item>
  
              <div class="postInfo-container">
                <el-row>
                  <el-col :span="8">
                    <el-form-item label-width="60px" label="Author:" class="postInfo-container-item">
                      <el-select v-model="postForm.author" :remote-method="getRemoteUserList" filterable default-first-option remote placeholder="Search user">
                        <el-option v-for="(item,index) in userListOptions" :key="item+index" :label="item" :value="item" />
                      </el-select>
                    </el-form-item>
                  </el-col>
  
                  <el-col :span="10">
                    <el-form-item label-width="120px" label="Publish Time:" class="postInfo-container-item">
                      <el-date-picker v-model="displayTime" type="datetime" format="yyyy-MM-dd HH:mm:ss" placeholder="Select date and time" />
                    </el-form-item>
                  </el-col>
  
                  <el-col :span="6">
                    <el-form-item label-width="90px" label="Importance:" class="postInfo-container-item">
                      <el-rate
                        v-model="postForm.importance"
                        :max="3"
                        :colors="['#99A9BF', '#F7BA2A', '#FF9900']"
                        :low-threshold="1"
                        :high-threshold="3"
                        style="display:inline-block"
                      />
                    </el-form-item>
                  </el-col>
                </el-row>
              </div>
            </el-col>
          </el-row>
  
          <el-form-item style="margin-bottom: 40px;" label-width="70px" label="Summary:">
            <el-input v-model="postForm.content_short" :rows="1" type="textarea" class="article-textarea" autosize placeholder="Please enter the content" />
            <span v-show="contentShortLength" class="word-counter">{{ contentShortLength }}words</span>
          </el-form-item>
  
          <el-form-item prop="content" style="margin-bottom: 30px;">
            <Tinymce ref="editor" v-model="postForm.content" :height="400" />
          </el-form-item>
  
          <el-form-item prop="image_uri" style="margin-bottom: 30px;">
            <Upload v-model="postForm.image_uri" />
          </el-form-item>
        </div>
      </el-form>
    </div>
  </template>
  
  <script>
  import Tinymce from '@/components/Tinymce'
  import Upload from '@/components/Upload/SingleImage3'
  import MDinput from '@/components/MDinput'
  import Sticky from '@/components/Sticky' // 粘性header组件
  import { validURL } from '@/utils/validate'
  import { fetchArticle } from '@/api/article'
  import { searchUser } from '@/api/remote-search'
  import Warning from './Warning'
  import { CommentDropdown, PlatformDropdown, SourceUrlDropdown } from './Dropdown'
  
  const defaultForm = {
    status: 'draft',
    title: '', // 文章题目
    content: '', // 文章内容
    content_short: '', // 文章摘要
    source_uri: '', // 文章外链
    image_uri: '', // 文章图片
    display_time: undefined, // 前台展示时间
    id: undefined,
    platforms: ['a-platform'],
    comment_disabled: false,
    importance: 0
  }
  
  export default {
    name: 'ArticleDetail',
    components: { Tinymce, MDinput, Upload, Sticky, Warning, CommentDropdown, PlatformDropdown, SourceUrlDropdown },
    props: {
      isEdit: {
        type: Boolean,
        default: false
      }
    },
    data() {
      const validateRequire = (rule, value, callback) => {
        if (value === '') {
          this.$message({
            message: rule.field + '为必传项',
            type: 'error'
          })
          callback(new Error(rule.field + '为必传项'))
        } else {
          callback()
        }
      }
      const validateSourceUri = (rule, value, callback) => {
        if (value) {
          if (validURL(value)) {
            callback()
          } else {
            this.$message({
              message: '外链url填写不正确',
              type: 'error'
            })
            callback(new Error('外链url填写不正确'))
          }
        } else {
          callback()
        }
      }
      return {
        postForm: Object.assign({}, defaultForm),
        loading: false,
        userListOptions: [],
        rules: {
          image_uri: [{ validator: validateRequire }],
          title: [{ validator: validateRequire }],
          content: [{ validator: validateRequire }],
          source_uri: [{ validator: validateSourceUri, trigger: 'blur' }]
        },
        tempRoute: {}
      }
    },
    computed: {
      contentShortLength() {
        return this.postForm.content_short.length
      },
      lang() {
        return this.$store.getters.language
      },
      displayTime: {
        // set and get is useful when the data
        // returned by the back end api is different from the front end
        // back end return => "2013-06-25 06:59:25"
        // front end need timestamp => 1372114765000
        get() {
          return (+new Date(this.postForm.display_time))
        },
        set(val) {
          this.postForm.display_time = new Date(val)
        }
      }
    },
    created() {
      if (this.isEdit) {
        const id = this.$route.params && this.$route.params.id
        this.fetchData(id)
      }
  
      // Why need to make a copy of this.$route here?
      // Because if you enter this page and quickly switch tag, may be in the execution of the setTagsViewTitle function, this.$route is no longer pointing to the current page
      // https://github.com/PanJiaChen/vue-element-admin/issues/1221
      this.tempRoute = Object.assign({}, this.$route)
    },
    methods: {
      fetchData(id) {
        fetchArticle(id).then(response => {
          this.postForm = response.data
  
          // just for test
          this.postForm.title += `   Article Id:${this.postForm.id}`
          this.postForm.content_short += `   Article Id:${this.postForm.id}`
  
          // set tagsview title
          this.setTagsViewTitle()
  
          // set page title
          this.setPageTitle()
        }).catch(err => {
          console.log(err)
        })
      },
      setTagsViewTitle() {
        const title = this.lang === 'zh' ? '编辑文章' : 'Edit Article'
        const route = Object.assign({}, this.tempRoute, { title: `${title}-${this.postForm.id}` })
        this.$store.dispatch('tagsView/updateVisitedView', route)
      },
      setPageTitle() {
        const title = 'Edit Article'
        document.title = `${title} - ${this.postForm.id}`
      },
      submitForm() {
        console.log(this.postForm)
        this.$refs.postForm.validate(valid => {
          if (valid) {
            this.loading = true
            this.$notify({
              title: '成功',
              message: '发布文章成功',
              type: 'success',
              duration: 2000
            })
            this.postForm.status = 'published'
            this.loading = false
          } else {
            console.log('error submit!!')
            return false
          }
        })
      },
      draftForm() {
        if (this.postForm.content.length === 0 || this.postForm.title.length === 0) {
          this.$message({
            message: '请填写必要的标题和内容',
            type: 'warning'
          })
          return
        }
        this.$message({
          message: '保存成功',
          type: 'success',
          showClose: true,
          duration: 1000
        })
        this.postForm.status = 'draft'
      },
      getRemoteUserList(query) {
        searchUser(query).then(response => {
          if (!response.data.items) return
          this.userListOptions = response.data.items.map(v => v.name)
        })
      }
    }
  }
  </script>
  
  <style lang="scss" scoped>
  @import "~@/styles/mixin.scss";
  
  .createPost-container {
    position: relative;
  
    .createPost-main-container {
      padding: 40px 45px 20px 50px;
  
      .postInfo-container {
        position: relative;
        @include clearfix;
        margin-bottom: 10px;
  
        .postInfo-container-item {
          float: left;
        }
      }
    }
  
    .word-counter {
      width: 40px;
      position: absolute;
      right: 10px;
      top: 0px;
    }
  }
  
  .article-textarea /deep/ {
    textarea {
      padding-right: 40px;
      resize: none;
      border: none;
      border-radius: 0px;
      border-bottom: 1px solid #bfcbd9;
    }
  }
  </style>