import React, { useState, useRef, useCallback } from 'react'
import { useForm } from 'formhero'
import axios from 'axios'
import getConfig from 'next/config'

const { RECAPTCHA_CLIENT } = getConfig().publicRuntimeConfig

const initial = {
    contact: '',
    description: '',
}

const ab2str = (buf: any): string => {
    return String.fromCharCode.apply(null, buf);
}

const Form: React.FC = () => {
    const [loading, setLoading] = useState(false)
    const [message, setMessage] = useState({
        title: '',
        error: false,
    })

    const { field, form, setForm } = useForm(initial)
    const [files, setFiles] = useState([] as File[])

    const _onFileChange = useCallback(async (e: React.ChangeEvent<HTMLInputElement>) => {
        setMessage({ title: '', error: false })
        const uploaded = Array.from(e.target.files || [])

        const nonAudio = uploaded.find(file => !/^audio\//.test(file.type))
        if (nonAudio) {
            setMessage({
                title: `Error: ${nonAudio.name} You can only select audio files.`,
                error: true,
            })
            return
        }

        setFiles([...files, ...uploaded])
    }, [files])

    const _clear = useCallback(() => {
        setFiles([])
    }, [])

    const _submit = useCallback((e: React.FormEvent) => {
        e.preventDefault()

        if (loading) return

        // @ts-ignore
        window.grecaptcha.ready(() => {
            // @ts-ignore
            window.grecaptcha.execute(RECAPTCHA_CLIENT, { action: 'homepage' }).then(function (token) {
                setLoading(true)
                setMessage({ title: '', error: false })


                const body = new FormData()

                body.append('json', JSON.stringify({
                    ...form,
                    token,
                }))

                for (const file of files) {
                    body.append(file.name, file)
                }

                fetch('/api/form', {
                    method: 'POST',
                    body
                })
                    .then(() => {
                        setForm(initial)
                        setFiles([])
                        setMessage({ title: 'Uploaded 🚀', error: false })
                    })
                    .catch(() => setMessage({ title: 'Something went wrong 😥', error: true }))
                    .finally(() => setLoading(false))
            })
        })
    }, [form, files, loading])

    return (
        <form onSubmit={_submit}>
            <div className='body'>
                <h3 className='ma0 mb3'>submit track</h3>
                <label className='text'>
                    <small>contact email</small>
                    <input
                        type='email'
                        disabled={loading}
                        placeholder={'me@example.org'}
                        {...field('contact')}
                    />
                </label>
                <br />
                <label className='text'>
                    <small>description</small>
                    <textarea
                        rows={2}
                        placeholder='reference trakcs, comments, ...'
                        disabled={loading}
                        {...field('description')}
                    />
                </label>
                <br />
                <label className='file'>
                    <input
                        type='file'
                        multiple
                        disabled={loading}
                        onChange={_onFileChange}
                    />
                    upload tracks [max. 300MiB]
                </label>
                {files.length > 0 && (
                    <div>
                        <input onClick={_clear} type='button' value='clear all' />
                        <ul>
                            {files.map((file, i) => <li key={i}>
                                {file.name}
                            </li>)}
                        </ul>
                    </div>
                )}
                <br />
                <input
                    type='submit'
                    value={loading ? 'uploading...' : 'submit'}
                    disabled={loading}
                />

                {!!message.title && (
                    <div>
                        <br />
                        <div className={`pa2 ba br1 ${message.error ? 'b--red' : 'b--light-blue'}`}>{message.title}</div>
                    </div>
                )}
            </div>

            <div className='grc'>
                This site is protected by reCAPTCHA and the Google&nbsp;
                <a href="https://policies.google.com/privacy">Privacy Policy</a> and&nbsp;
                <a href="https://policies.google.com/terms">Terms of Service</a> apply.
            </div>
        </form>
    )
}

export default Form