// Menu-like Picker variant with keyboard control
// Version 2020-06-30
// License: LGPLv3.0+
// (c) Vitaliy Filippov 2020+

import React from 'react';
import PropTypes from 'prop-types';

import autocomplete_css from './autocomplete.css';
import Picker from './Picker.js';

export default class PickerMenu extends Picker
{
    static propTypes = {
        ...Picker.propTypes,
        // menu options
        items: PropTypes.array,
        // additional text/items to render before menu items
        beforeItems: PropTypes.any,
        // additional text/items to render after menu items
        afterItems: PropTypes.any,
        // menuitem callback
        onSelectItem: PropTypes.func,
        // don't hide the menu on item click
        keepOnClick: PropTypes.bool,
        // menuitem name key - default empty (render the item itself)
        labelKey: PropTypes.oneOfType([PropTypes.string, PropTypes.number]),
        // change theme (CSS module) for this input
        theme: PropTypes.object,
    }

    onKeyDown = (ev) =>
    {
        if ((ev.which == 40 || ev.which == 38) && this.props.items.length)
        {
            // up / down
            this.setState({
                active: this.state.active == null ? 0 : (
                    (this.state.active + (event.which === 40 ? 1 : this.props.items.length-1)) % this.props.items.length
                ),
            });
            if (!this.state.focused)
            {
                this.focus();
            }
        }
        else if (ev.which == 10 || ev.which == 13)
        {
            // enter
            if (!this.state.focused)
            {
                this.focus();
            }
            else if (this.state.active != null && this.state.active < this.props.items.length)
            {
                this.onMouseDown();
            }
        }
    }

    onMouseDown = (ev) =>
    {
        if (!this.props.keepOnClick)
        {
            if (this.input)
            {
                this.input.blur();
            }
            this.blur();
        }
        else if (ev)
        {
            ev.preventDefault();
        }
        const sel = this.props.items[this.state.active];
        const f = this.props.onSelectItem;
        if (f)
        {
            f(sel);
        }
        else if (sel.onClick)
        {
            sel.onClick();
        }
    }

    onMouseOver = (ev) =>
    {
        let e = ev.target;
        while (e && e != ev.currentTarget && !e.id)
        {
            e = e.parentNode;
        }
        if (e && e.id)
        {
            this.setState({ active: e.id });
        }
    }

    animatePicker = (e) =>
    {
        if (e)
        {
            if (!this.props.renderInput)
            {
                e.focus();
            }
            e.style.visibility = 'hidden';
            e.style.overflowY = 'hidden';
            const anim = window.requestAnimationFrame || window.mozRequestAnimationFrame || window.msRequestAnimationFrame;
            anim(() =>
            {
                e.style.visibility = '';
                e.style.maxHeight = '1px';
                anim(() =>
                {
                    e.style.maxHeight = '100%';
                    const end = () => { e.style.overflowY = 'auto'; e.removeEventListener('transitionend', end); };
                    e.addEventListener('transitionend', end);
                });
            });
        }
    }

    renderPicker = () =>
    {
        const theme = this.props.theme || autocomplete_css;
        return (<div ref={this.animatePicker}
            tabIndex={!this.props.renderInput ? 1 : undefined}
            className={theme.suggestions}
            onKeyDown={this.onKeyDown}
            onMouseOver={this.onMouseOver}>
            {this.props.beforeItems}
            {this.props.items.map((e, i) => (<div key={i} id={i} onMouseDown={this.onMouseDown}
                className={theme.suggestion+(this.state.active == i ? ' '+theme.active : '')}>
                {!this.props.labelKey ? e : e[this.props.labelKey]}
            </div>))}
            {this.props.afterItems}
        </div>);
    }

    getInputProps()
    {
        return {
            ...super.getInputProps(),
            onKeyDown: this.onKeyDown,
        };
    }

    componentDidUpdate()
    {
        super.componentDidUpdate();
        if (this.input && this.state.focused)
        {
            if (this.prevHeight && this.input.offsetHeight != this.prevHeight)
            {
                this.calculateDirection();
            }
            this.prevHeight = this.input.offsetHeight;
        }
    }
}

delete PickerMenu.propTypes.renderPicker;