import React, { useState, useEffect, useRef } from 'react';
import PropTypes from 'prop-types';

import { useFormState } from 'react-use-form-state';

import { MessageType } from './Types';

import Icon from './Icon';
import Button from './Button';

import UploadButton from './UploadButton';

export default function MessageInput({ text, data, rows, children, onSend }) {
    let textareaRef = useRef();
    let fileinput = useRef();

    let updateFocus = () => {
        const isDesktop = window.matchMedia('(min-width: 62.5rem)');
        if (isDesktop.matches) {
            textareaRef.current.focus();
        }
    };
    useEffect(() => {
        textareaRef.current.value = text || '';
        updateFocus();
    }, [text]);

    let handleCtrlEnter = (event) => {
        if (event.ctrlKey && (event.charCode == 10 || event.charCode == 13)) {
            onSubmit({});
        }
    };
    let textChanged = (event) => {
        const el = textareaRef.current;
        const offset = el.offsetHeight - el.clientHeight;
        const height = el.scrollHeight + offset;
        el.style.height = `${height + offset}px`;
    };
    const [attach, setAttach] = useState('');
    const [formState, { textarea }] = useFormState();
    let uploadValueChanged = (attach) => {
        setAttach(attach);
    };
    let onSubmit = (event) => {
        if (event.preventDefault) {
            event.preventDefault();
        }
        const input = fileinput.current;
        onSend({
            mid: data.mid,
            rid: data.rid || 0,
            body: formState.values.body,
            attach: attach ? input.files[0] : '',
            to: data.to || {}
        });
        setAttach('');
        formState.values.body = '';
        textareaRef.current.value = '';
        textareaRef.current.style.height = '';
        updateFocus();
    };
    return (
        <form className="msg-comment-target" style={{ padding: '12px' }} onSubmit={onSubmit}>
            <div style={commentStyle}>
                <textarea onChange={textChanged} onKeyPress={handleCtrlEnter}
                    ref={textareaRef} style={textInputStyle} value={formState.values.body}
                    rows={rows || '1'} placeholder={children} {...textarea('body')} />
                <div style={inputBarStyle}>
                    <UploadButton inputRef={fileinput} value={attach} onChange={uploadValueChanged} />
                    <Button onClick={onSubmit}><Icon name="ei-envelope" size="s" />Send</Button>
                </div>
            </div>
        </form>
    );
}

const commentStyle = {
    display: 'flex',
    flexDirection: 'column',
    borderTop: '1px #eee solid',
    width: '100%',
    marginTop: '10px'
};

const inputBarStyle = {
    display: 'flex',
    alignItems: 'center',
    justifyContent: 'space-between',
    padding: '3px'
};

const textInputStyle = {
    overflow: 'hidden',
    resize: 'none',
    display: 'block',
    boxSizing: 'border-box',
    border: 0,
    outline: 'none',
    padding: '4px'
};

MessageInput.propTypes = {
    children: PropTypes.node,
    data: MessageType.isRequired,
    onSend: PropTypes.func.isRequired,
    rows: PropTypes.string,
    text: PropTypes.string
};