import { useState, useEffect } from 'react'
import Loader from '../Loader'
import htmlParser from 'html-react-parser'
import dynamic from 'next/dynamic'
import api from '../../utils/api'
import fr from 'date-fns/locale/fr'
import { registerLocale } from 'react-datepicker'
import date from 'date-and-time'
import 'react-datepicker/dist/react-datepicker.css'

registerLocale('fr', fr)

const FunctionForm = (props) => {
  const [inputState, setInputState] = useState({})
  const [message, setMessage] = useState('')
  const [isLoading, setIsLoading] = useState(false)

  // inputState par défaut
  useEffect(() => {
    const inputStateNew = { ...inputState }
    props.inputsArray.forEach((input) => {
      if (input.type === 'select' && input.options.length > 0) {
        inputStateNew[input.name] = input.options[0].value
      }
    })
    setInputState(inputStateNew)
  }, [])

  const handleSubmit = (event) => {
    setIsLoading(true)
    event.preventDefault()
    api.post(`/functions/${props.slug}`, inputState)
      .then((response) => {
        setMessage(response.data.resultHTML)
        setIsLoading(false)
      })
      .catch((error) => {
        setMessage(error.response.data.message)
        setIsLoading(false)
      })
  }

  const handleChange = (event) => {
    const inputStateNew = { ...inputState }
    inputStateNew[event.target.name] = event.target.value
    setInputState(inputStateNew)
  }

  if (props.inputsArray.length <= 0) {
    return (
      <div className='FunctionComponent__slide text-center'>
        <p>La fonction n'est pas encore disponible.</p>
      </div>
    )
  }
  return (
    <>
      <form onSubmit={handleSubmit}>
        {props.inputsArray.map((input, index) => {
          switch (input.type) {
            case 'text':
              return (
                <div key={index} className='form-group'>
                  <label className='form-label' htmlFor={input.name}>{input.label}</label>
                  <input onChange={handleChange} type='text' name={input.name} id={input.name} placeholder={input.placeholder} className='form-control' />
                </div>
              )
            case 'integer':
            case 'float':
              return (
                <div key={index} className='form-group'>
                  <label className='form-label' htmlFor={input.name}>{input.label}</label>
                  <input onChange={handleChange} type='number' step={(input.type === 'integer') ? '1' : '0.01'} name={input.name} id={input.name} placeholder={input.placeholder} className='form-control' />
                </div>
              )
            case 'calendar':
              // Permet au datepicker de prendre la hauteur
              if (typeof window !== 'undefined') {
                const newScript = document.createElement('script')
                newScript.src = '/js/extraHeightCSS.js'
                document.body.appendChild(newScript)
              }
              // eslint-disable-next-line
              const DatePicker = dynamic(
                () => import('react-datepicker'),
                { ssr: false }
              )
              return (
                <div key={index} className='form-group'>
                  <label className='form-label' htmlFor={input.name}>{input.label}</label>
                  <br />
                  <DatePicker
                    selected={(() => {
                      try {
                        if (inputState[input.name] != null) {
                          const dateArray = inputState[input.name].split('/')
                          const year = dateArray[2]
                          const month = dateArray[1]
                          const day = dateArray[0]
                          return new Date(year, parseInt(month) - 1, parseInt(day) + 1)
                        }
                        throw new Error('Not a valid date')
                      } catch {
                        return new Date()
                      }
                    })()}
                    locale='fr'
                    dateFormat='dd/MM/yyyy'
                    fixedHeight
                    placeholderText={input.placeholder}
                    onChange={(dateObject) => {
                      try {
                        const formattedDate = date.format(dateObject, 'DD/MM/YYYY', true)
                        handleChange({
                          target: {
                            name: input.name,
                            value: formattedDate
                          }
                        })
                      } catch {}
                    }}
                  />
                </div>
              )
            case 'select':
              return (
                <div key={index} className='form-group'>
                  <label className='form-label' htmlFor={input.name}>{input.label}</label>
                  <select onChange={handleChange} name={input.name} id={input.name} value={inputState[input.name] || input.options[0]} className='form-control'>
                    {input.options.map((option, optionIndex) => {
                      return (
                        <option key={optionIndex} value={option.value}>{option.name}</option>
                      )
                    })}
                  </select>
                </div>
              )
            default:
              return (
                <p>Erreur, l'input n'est pas valide...</p>
              )
          }
        })}

        <div className='form-group text-center'>
          <button type='submit' className='btn btn-dark'>Envoyer</button>
        </div>
      </form>
      <div className='form-result text-center'>
        {
          (isLoading)
            ? <Loader />
            : htmlParser(message)
        }
      </div>
    </>
  )
}

export default FunctionForm