import React, { Component } from 'react'
import Router from 'next/router'
import dynamic from 'next/dynamic'
import Page from '../comps/Page'
import Markdown from '../comps/Markdown'
import { checkDir, checkName } from '../util/checkDirParts'
import updStateFromId from '../util/updStateFromId'
import getUrl from '../util/getUrl'
import getJwt from '../util/getJwt'

const CodeMirrorSkel = () => (
  <div className="column">
    <textarea style={{ height: 'calc(300px - 1.2rem)', margin: 0 }} />
  </div>
)
const CodeMirror = dynamic(import('../comps/CodeMirror'), {
  loading: CodeMirrorSkel,
  ssr: false,
})
const initState = {
  name: '',
  dir: '',
  md: '## New Document!!',
  editMode: false,
  error: null,
  pending: false,
}

export default class MngDoc extends Component {
  state = initState
  updVal = updStateFromId.bind(this)
  updMd = md => this.setState({ md })
  submit = async () => {
    let { name, md, dir, editMode } = this.state
    let data = {
      name: checkName(name),
      dir: checkDir(dir),
      md,
    }
    const doErr = error => this.setState({ pending: false, error })
    const dirErr =
      'can only contain A-Z, a-z, 0-9, -, or . and not start or end with .'

    if (!data.name)
      return doErr(
        'Document name ' + (data.name === 0 ? 'can not be empty' : dirErr)
      )
    if (!data.dir && data.dir !== 0) {
      return doErr('Directory ' + dirErr)
    } else if (data.dir === 0) {
      data.dir = ''
    }
    if (data.md.trim().length === 0) {
      return doErr('Content can not be empty')
    }
    let url = getUrl('docs'),
      method = 'POST',
      headers = {
        Authorization: getJwt(),
        'Content-Type': 'application/json',
      }
    if (editMode) {
      let numRemoved = 0
      const dataKeys = Object.keys(data)
      dataKeys.forEach(k => {
        if (data[k] === this.props.doc[k]) {
          delete data[k]
          numRemoved++
        }
      })
      if (dataKeys.length === numRemoved) return
      url = getUrl('docs/' + this.props.doc.id)
      method = 'PATCH'
    }
    this.setState({ error: null, pending: true })
    const res = await fetch(url, {
      headers,
      method,
      body: JSON.stringify(data),
    }).catch(doErr)
    try {
      data = await res.json()
    } catch (err) {
      data = { message: 'An error occurred submitting doc' }
    }
    if (res.ok) {
      const { id } = data
      return Router.push(
        {
          pathname: '/k',
          query: { id },
        },
        getUrl(`k/${id}`)
      )
    }
    doErr(data.message)
  }
  static getDerivedStateFromProps(nextProps, prevState) {
    const { doc } = nextProps
    if (doc) {
      const { name, dir, md } = doc
      return { name, md, dir, editMode: true }
    } else if (prevState.id) {
      return initState
    }
    return null
  }
  render() {
    const { md, dir, name, error, pending } = this.state
    const rowStyle = { paddingTop: 10 }
    return (
      <Page>
        <div className="row fill" style={rowStyle}>
          <div className="column column-50">
            <Markdown className="fill Markdown" source={md} />
          </div>
          <div className="column column-50">
            <div className="row">
              <div className="column column-60">
                <input
                  type="text"
                  maxLength={250}
                  placeholder="New document name"
                  id="name"
                  value={name}
                  onChange={this.updVal}
                />
              </div>
              <div className="column">
                <input
                  type="text"
                  maxLength={1024}
                  placeholder="Subdirectory (optional)"
                  id="dir"
                  value={dir}
                  onChange={this.updVal}
                />
              </div>
            </div>
            <div className="row">
              <CodeMirror
                value={md}
                className="column WrapCodeMirror"
                onChange={this.updMd}
                onSubmit={this.submit}
                options={{
                  theme: 'monokai',
                  mode: 'markdown',
                  lineWrapping: true,
                }}
              />
            </div>
            <div className="row" style={{ marginTop: 5 }}>
              <div className="column">
                <span>{error}</span>
                <button
                  className="float-right"
                  style={{ marginTop: 5 }}
                  onClick={pending ? null : this.submit}
                >
                  Submit
                </button>
              </div>
            </div>
          </div>
        </div>
      </Page>
    )
  }
}