import React from "react"
import {
  Row,
  Col,
  Form,
  Select,
  Input,
  Upload,
  Button,
  Radio,
  Icon,
  Spin,
  Progress,
  Popconfirm,
  Tag,
  notification
} from "antd"
import * as cs from "./constants"

const StatusNone = "none"
const StatusImporting = "importing"
const StatusStopping = "stopping"
const StatusFinished = "finished"
const StatusFailed = "failed"

class TheFormDef extends React.PureComponent {
  state = {
    confirmDirty: false,
    fileList: [],
    formLoading: false,
    mode: "subscribe"
  }

  componentDidMount() {
    // Fetch lists.
    this.props.modelRequest(cs.ModelLists, cs.Routes.GetLists, cs.MethodGet)
  }

  // Handle create / edit form submission.
  handleSubmit = e => {
    e.preventDefault()
    var err = null,
      values = {}
    this.props.form.validateFields((e, v) => {
      err = e
      values = v
    })
    if (err) {
      return
    }

    if (this.state.fileList.length < 1) {
      notification["error"]({
        placement: cs.MsgPosition,
        message: "Error",
        description: "Select a valid file to upload"
      })
      return
    }

    this.setState({ formLoading: true })
    let params = new FormData()
    params.set("params", JSON.stringify(values))
    params.append("file", this.state.fileList[0])
    this.props
      .request(cs.Routes.UploadRouteImport, cs.MethodPost, params)
      .then(() => {
        notification["info"]({
          placement: cs.MsgPosition,
          message: "File uploaded",
          description: "Please wait while the import is running"
        })
        this.props.fetchimportState()
        this.setState({ formLoading: false })
      })
      .catch(e => {
        notification["error"]({
          placement: cs.MsgPosition,
          message: "Error",
          description: e.message
        })
        this.setState({ formLoading: false })
      })
  }

  handleConfirmBlur = e => {
    const value = e.target.value
    this.setState({ confirmDirty: this.state.confirmDirty || !!value })
  }

  onFileChange = f => {
    let fileList = [f]
    this.setState({ fileList })
    return false
  }

  render() {
    const { getFieldDecorator } = this.props.form

    const formItemLayout = {
      labelCol: { xs: { span: 16 }, sm: { span: 4 } },
      wrapperCol: { xs: { span: 16 }, sm: { span: 10 } }
    }

    const formItemTailLayout = {
      wrapperCol: { xs: { span: 24, offset: 0 }, sm: { span: 10, offset: 4 } }
    }

    return (
      <Spin spinning={this.state.formLoading}>
        <Form onSubmit={this.handleSubmit}>
          <Form.Item {...formItemLayout} label="Mode">
            {getFieldDecorator("mode", {
              rules: [{ required: true }],
              initialValue: "subscribe"
            })(
              <Radio.Group
                className="mode"
                onChange={e => {
                  this.setState({ mode: e.target.value })
                }}
              >
                <Radio disabled={this.props.formDisabled} value="subscribe">
                  Subscribe
                </Radio>
                <Radio disabled={this.props.formDisabled} value="blacklist">
                  Blacklist
                </Radio>
              </Radio.Group>
            )}
          </Form.Item>
          {this.state.mode === "subscribe" && (
            <React.Fragment>
              <Form.Item
                {...formItemLayout}
                label="Lists"
                extra="Lists to subscribe to"
              >
                {getFieldDecorator("lists", { rules: [{ required: true }] })(
                  <Select mode="multiple">
                    {[...this.props.lists].map((v, i) => (
                      <Select.Option value={v["id"]} key={v["id"]}>
                        {v["name"]}
                      </Select.Option>
                    ))}
                  </Select>
                )}
              </Form.Item>
            </React.Fragment>
          )}
          {this.state.mode === "blacklist" && (
            <Form.Item {...formItemTailLayout}>
              <p className="ant-form-extra">
                All existing subscribers found in the import will be marked as
                'blacklisted' and will be unsubscribed from their existing
                subscriptions. New subscribers will be imported and marked as
                'blacklisted'.
              </p>
            </Form.Item>
          )}
          <Form.Item
            {...formItemLayout}
            label="CSV column delimiter"
            extra="Default delimiter is comma"
          >
            {getFieldDecorator("delim", {
              initialValue: ","
            })(<Input maxLength="1" style={{ maxWidth: 40 }} />)}
          </Form.Item>
          <Form.Item {...formItemLayout} label="CSV or ZIP file">
            <div className="dropbox">
              {getFieldDecorator("file", {
                valuePropName: "file",
                getValueFromEvent: this.normFile,
                rules: [{ required: true }]
              })(
                <Upload.Dragger
                  name="files"
                  multiple={false}
                  fileList={this.state.fileList}
                  beforeUpload={this.onFileChange}
                  accept=".zip,.csv"
                >
                  <p className="ant-upload-drag-icon">
                    <Icon type="inbox" />
                  </p>
                  <p className="ant-upload-text">
                    Click or drag a CSV or ZIP file here
                  </p>
                </Upload.Dragger>
              )}
            </div>
          </Form.Item>
          <Form.Item {...formItemTailLayout}>
            <p className="ant-form-extra">
              For existing subscribers, the names and attributes will be
              overwritten with the values in the CSV.
            </p>
            <Button type="primary" htmlType="submit">
              <Icon type="upload" /> Upload
            </Button>
          </Form.Item>
        </Form>
      </Spin>
    )
  }
}
const TheForm = Form.create()(TheFormDef)

class Importing extends React.PureComponent {
  state = {
    pollID: -1,
    logs: ""
  }

  stopImport = () => {
    // Get the import status.
    this.props
      .request(cs.Routes.UploadRouteImport, cs.MethodDelete)
      .then(r => {
        this.props.fetchimportState()
      })
      .catch(e => {
        notification["error"]({
          placement: cs.MsgPosition,
          message: "Error",
          description: e.message
        })
      })
  }

  componentDidMount() {
    // Poll for stats until it's finished or failed.
    let pollID = window.setInterval(() => {
      this.props.fetchimportState()
      this.fetchLogs()
      if (
        this.props.importState.status === StatusFinished ||
        this.props.importState.status === StatusFailed
      ) {
        window.clearInterval(this.state.pollID)
      }
    }, 1000)

    this.setState({ pollID: pollID })
  }
  componentWillUnmount() {
    window.clearInterval(this.state.pollID)
  }

  fetchLogs() {
    this.props
      .request(cs.Routes.GetRouteImportLogs, cs.MethodGet)
      .then(r => {
        this.setState({ logs: r.data.data })
        let t = document.querySelector("#log-textarea")
        t.scrollTop = t.scrollHeight
      })
      .catch(e => {
        notification["error"]({
          placement: cs.MsgPosition,
          message: "Error",
          description: e.message
        })
      })
  }

  render() {
    let progressPercent = 0
    if (this.props.importState.status === StatusFinished) {
      progressPercent = 100
    } else {
      progressPercent = Math.floor(
        (this.props.importState.imported / this.props.importState.total) * 100
      )
    }

    return (
      <section className="content import">
        <h1>Importing &mdash; {this.props.importState.name}</h1>
        {this.props.importState.status === StatusImporting && (
          <p>
            Import is in progress. It is safe to navigate away from this page.
          </p>
        )}

        {this.props.importState.status !== StatusImporting && (
          <p>Import has finished.</p>
        )}

        <Row className="import-container">
          <Col span="10" offset="3">
            <div className="stats center">
              <div>
                <Progress type="line" percent={progressPercent} />
              </div>

              <div>
                <h3>{this.props.importState.imported} records</h3>
                <br />

                {this.props.importState.status === StatusImporting && (
                  <Popconfirm
                    title="Are you sure?"
                    onConfirm={() => this.stopImport()}
                  >
                    <p>
                      <Icon type="loading" />
                    </p>
                    <Button type="primary">Stop import</Button>
                  </Popconfirm>
                )}
                {this.props.importState.status === StatusStopping && (
                  <div>
                    <p>
                      <Icon type="loading" />
                    </p>
                    <h4>Stopping</h4>
                  </div>
                )}
                {this.props.importState.status !== StatusImporting &&
                  this.props.importState.status !== StatusStopping && (
                    <div>
                      {this.props.importState.status !== StatusFinished && (
                        <div>
                          <Tag color="red">{this.props.importState.status}</Tag>
                          <br />
                        </div>
                      )}

                      <br />
                      <Button type="primary" onClick={() => this.stopImport()}>
                        Done
                      </Button>
                    </div>
                  )}
              </div>
            </div>

            <div className="logs">
              <h3>Import log</h3>
              <Spin spinning={this.state.logs === ""}>
                <Input.TextArea
                  placeholder="Import logs"
                  id="log-textarea"
                  rows={10}
                  value={this.state.logs}
                  autosize={{ minRows: 2, maxRows: 10 }}
                />
              </Spin>
            </div>
          </Col>
        </Row>
      </section>
    )
  }
}

class Import extends React.PureComponent {
  state = {
    importState: { status: "" }
  }

  fetchimportState = () => {
    // Get the import status.
    this.props
      .request(cs.Routes.GetRouteImportStats, cs.MethodGet)
      .then(r => {
        this.setState({ importState: r.data.data })
      })
      .catch(e => {
        notification["error"]({
          placement: cs.MsgPosition,
          message: "Error",
          description: e.message
        })
      })
  }

  componentDidMount() {
    this.props.pageTitle("Import subscribers")
    this.fetchimportState()
  }
  render() {
    if (this.state.importState.status === "") {
      // Fetching the status.
      return (
        <section className="content center">
          <Spin />
        </section>
      )
    } else if (this.state.importState.status !== StatusNone) {
      // There's an import state
      return (
        <Importing
          {...this.props}
          importState={this.state.importState}
          fetchimportState={this.fetchimportState}
        />
      )
    }

    return (
      <section className="content import">
        <Row>
          <Col span={22}>
            <h1>Import subscribers</h1>
          </Col>
          <Col span={2} />
        </Row>

        <TheForm
          {...this.props}
          fetchimportState={this.fetchimportState}
          lists={this.props.data[cs.ModelLists]}
        />

        <hr />
        <div className="help">
          <h2>Instructions</h2>
          <p>
            Upload a CSV file or a ZIP file with a single CSV file in it to bulk
            import subscribers. The CSV file should have the following headers
            with the exact column names. <code>attributes</code> (optional)
            should be a valid JSON string with double escaped quotes.
          </p>

          <blockquote className="csv-example">
            <code className="csv-headers">
              <span>email,</span>
              <span>name,</span>
              <span>status,</span>
              <span>attributes</span>
            </code>
          </blockquote>

          <h3>Example raw CSV</h3>
          <blockquote className="csv-example">
            <code className="csv-headers">
              <span>email,</span>
              <span>name,</span>
              <span>status,</span>
              <span>attributes</span>
            </code>
            <code className="csv-row">
              <span>user1@mail.com,</span>
              <span>"User One",</span>
              <span>enabled,</span>
              <span>{'"{""age"": 32, ""city"": ""Bangalore""}"'}</span>
            </code>
            <code className="csv-row">
              <span>user2@mail.com,</span>
              <span>"User Two",</span>
              <span>blacklisted,</span>
              <span>
                {'"{""age"": 25, ""occupation"": ""Time Traveller""}"'}
              </span>
            </code>
          </blockquote>
        </div>
      </section>
    )
  }
}

export default Import