// Menu-like Picker variant with keyboard control
// Version 2021-10-07
// 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]),
        // menuitem CSS class key - default none
        classKey: PropTypes.oneOfType([PropTypes.string, PropTypes.number]),
        // menuitem "disabled" key - default none
        disabledKey: 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
            const dir = (event.which === 40 ? 1 : -1);
            let prev = this.state.active, active;
            if (prev == null)
                active = dir == 1 ? 0 : this.props.items.length-1;
            else
                active = (prev + this.props.items.length + dir) % this.props.items.length;
            if (this.props.disabledKey != null)
            {
                while (this.props.items[active][this.props.disabledKey] && active != prev)
                {
                    active = (active + this.props.items.length + dir) % this.props.items.length;
                }
                if (this.props.items[active][this.props.disabledKey])
                {
                    active = null;
                }
            }
            this.setState({ active });
            if (!this.state.focused)
            {
                this.focus();
            }
            ev.preventDefault();
        }
        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();
            }
            ev.preventDefault();
        }
    }

    onMouseDown = (ev) =>
    {
        if (this.state.active == null)
        {
            return;
        }
        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.getAttribute('data-idx'))
        {
            e = e.parentNode;
        }
        if (e && e.getAttribute('data-idx') &&
            (this.props.disabledKey == null || !this.props.items[e.getAttribute('data-idx')][this.props.disabledKey]))
        {
            this.setState({ active: e.getAttribute('data-idx') });
        }
    }

    renderPicker = () =>
    {
        const theme = this.props.theme || autocomplete_css;
        if (!this.props.beforeItems && !this.props.items.length && !this.props.afterItems)
        {
            return null;
        }
        return (<div ref={this.animatePicker}
            tabIndex={!this.props.renderInput ? 1 : undefined}
            className={theme.suggestions+" scrollable"}
            onKeyDown={this.onKeyDown}
            onMouseOver={this.onMouseOver}>
            {this.props.beforeItems}
            {this.props.items.map((e, i) => (<div key={i} data-idx={i} onMouseDown={this.onMouseDown}
                className={theme.suggestion+
                    (this.props.disabledKey != null && e[this.props.disabledKey] ? ' '+theme.disabled : '')+
                    (this.props.classKey != null && e[this.props.classKey] ? ' '+e[this.props.classKey] : '')+
                    (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(prevProps)
    {
        super.componentDidUpdate(prevProps);
        if (this.state.focused)
        {
            if (this.prevHeight && this.input && this.input.offsetHeight != this.prevHeight ||
                this.props.items != prevProps.items)
            {
                this.calculateDirection();
            }
            if (this.input)
            {
                this.prevHeight = this.input.offsetHeight;
            }
        }
    }
}

delete PickerMenu.propTypes.renderPicker;