import React, {useContext} from "react";
import {Table, TableBody, TableCell, TableHeader, TableHeaderCell, TableRow} from "semantic-ui-react";
import {Button, Header, Modal} from "./Theme";
import {ThemeContext} from "../contexts/contexts";
import {SHORTCUTS} from "./KeyboardShortcutsProvider";

// Format keyboard keys for display
function KeyboardKey({children}) {
    return (
        <kbd style={{
            backgroundColor: '#f7f7f7',
            border: '1px solid #ccc',
            borderRadius: '3px',
            boxShadow: '0 1px 0 rgba(0,0,0,0.2)',
            color: '#333',
            display: 'inline-block',
            fontFamily: 'monospace',
            fontSize: '0.85em',
            lineHeight: '1.4',
            margin: '0 2px',
            padding: '2px 6px',
            whiteSpace: 'nowrap',
        }}>
            {children}
        </kbd>
    );
}

// Parse shortcut keys string and render as keyboard keys
function ShortcutKeys({keys}) {
    // Handle multiple key combinations (e.g., "meta+k, ctrl+k")
    const combinations = keys.split(', ');

    return (
        <span>
            {combinations.map((combo, idx) => {
                const parts = combo.split('+').map(part => {
                    // Convert key names to display format
                    switch (part.toLowerCase()) {
                        case 'meta':
                            return 'Cmd';
                        case 'ctrl':
                            return 'Ctrl';
                        case 'shift':
                            return 'Shift';
                        case 'escape':
                            return 'Esc';
                        default:
                            return part.toUpperCase();
                    }
                });

                // Handle sequence shortcuts like "g h"
                const isSequence = combo.includes(' ') && !combo.includes('+');
                if (isSequence) {
                    const seqParts = combo.split(' ');
                    return (
                        <span key={idx}>
                            {idx > 0 && ' / '}
                            {seqParts.map((p, i) => (
                                <React.Fragment key={i}>
                                    <KeyboardKey>{p.toUpperCase()}</KeyboardKey>
                                    {i < seqParts.length - 1 && ' then '}
                                </React.Fragment>
                            ))}
                        </span>
                    );
                }

                return (
                    <span key={idx}>
                        {idx > 0 && ' / '}
                        {parts.map((p, i) => (
                            <React.Fragment key={i}>
                                <KeyboardKey>{p}</KeyboardKey>
                                {i < parts.length - 1 && ' + '}
                            </React.Fragment>
                        ))}
                    </span>
                );
            })}
        </span>
    );
}

// Group shortcuts by category
function groupShortcutsByCategory(shortcuts) {
    const groups = {};
    shortcuts.forEach(shortcut => {
        const category = shortcut.category || 'Other';
        if (!groups[category]) {
            groups[category] = [];
        }
        groups[category].push(shortcut);
    });
    return groups;
}

export default function HelpModal({open, onClose}) {
    const {i, t} = useContext(ThemeContext);
    const groupedShortcuts = groupShortcutsByCategory(SHORTCUTS);

    // Order categories
    const categoryOrder = ['Search', 'General', 'Help', 'Navigation'];
    const orderedCategories = categoryOrder.filter(cat => groupedShortcuts[cat]);

    return (
        <Modal closeIcon open={open} onClose={onClose} size='small'>
            <Modal.Header>Keyboard Shortcuts</Modal.Header>
            <Modal.Content scrolling>
                {orderedCategories.map(category => (
                    <div key={category} style={{marginBottom: '1.5em'}}>
                        <Header as='h4' {...t}>{category}</Header>
                        <Table basic='very' compact {...i}>
                            <TableBody>
                                {groupedShortcuts[category].map((shortcut, idx) => (
                                    <TableRow key={idx}>
                                        <TableCell width={6}>
                                            <ShortcutKeys keys={shortcut.keys}/>
                                        </TableCell>
                                        <TableCell {...t}>{shortcut.description}</TableCell>
                                    </TableRow>
                                ))}
                            </TableBody>
                        </Table>
                    </div>
                ))}
            </Modal.Content>
            <Modal.Actions>
                <Button onClick={onClose}>Close</Button>
            </Modal.Actions>
        </Modal>
    );
}