/* eslint-disable @typescript-eslint/no-explicit-any */
import React, { useState, useEffect, useRef } from 'react';
import { format } from 'date-fns';

interface SomedayList {
    id: string;
    title: string;
    tasks: any[];
}

interface SearchModalProps {
    isOpen: boolean;
    onClose: () => void;
    tasks: any[];
    events: any[];
    somedayLists?: SomedayList[];
    onSelectTask: (date: Date) => void;
}

export default function SearchModal({ isOpen, onClose, tasks, events, somedayLists = [], onSelectTask }: SearchModalProps) {
    const [query, setQuery] = useState('');
    const [results, setResults] = useState<{ type: 'task' | 'event' | 'someday', item: any }[]>([]);
    const inputRef = useRef<HTMLInputElement>(null);
    const dialogRef = useRef<HTMLDivElement>(null);

    useEffect(() => {
        if (isOpen && inputRef.current) {
            inputRef.current.focus();
        }
    }, [isOpen]);

    // Focus trap
    useEffect(() => {
        if (!isOpen) return;
        const handleKeyDown = (e: KeyboardEvent) => {
            if (e.key === 'Escape') { onClose(); return; }
            if (e.key !== 'Tab') return;
            const dialog = dialogRef.current;
            if (!dialog) return;
            const focusable = Array.from(
                dialog.querySelectorAll<HTMLElement>('button, input, a[href], [tabindex]:not([tabindex="-1"])')
            ).filter(el => !el.hasAttribute('disabled'));
            if (focusable.length === 0) return;
            const first = focusable[0];
            const last = focusable[focusable.length - 1];
            if (e.shiftKey) {
                if (document.activeElement === first) { e.preventDefault(); last.focus(); }
            } else {
                if (document.activeElement === last) { e.preventDefault(); first.focus(); }
            }
        };
        document.addEventListener('keydown', handleKeyDown);
        return () => document.removeEventListener('keydown', handleKeyDown);
    }, [isOpen, onClose]);

    useEffect(() => {
        if (!query.trim()) {
            setResults([]);
            return;
        }

        const lowerQuery = query.toLowerCase();

        const filteredTasks = tasks.filter(t =>
            t.title.toLowerCase().includes(lowerQuery) && !t.somedayListId
        ).map(t => ({ type: 'task' as const, item: t }));

        // Include someday tasks from all someday lists
        const somedayTasks = somedayLists.flatMap(list =>
            list.tasks
                .filter(t => t.title.toLowerCase().includes(lowerQuery))
                .map(t => ({ type: 'someday' as const, item: { ...t, somedayListTitle: list.title } }))
        );

        const filteredEvents = events.filter(e =>
            e.title.toLowerCase().includes(lowerQuery)
        ).map(e => ({ type: 'event' as const, item: e }));

        setResults([...filteredTasks, ...somedayTasks, ...filteredEvents].slice(0, 15));
    }, [query, tasks, events, somedayLists]);

    if (!isOpen) return null;

    return (
        <div
            className="fixed inset-0 bg-black/50 z-50 flex items-start justify-center pt-20"
            onClick={onClose}
            aria-hidden="true"
        >
            <div
                ref={dialogRef}
                role="dialog"
                aria-modal="true"
                aria-label="Search tasks and events"
                className="rounded-lg shadow-2xl w-[600px] max-w-[90%] overflow-hidden"
                style={{ backgroundColor: 'var(--weekly-bg, #ffffff)' }}
                onClick={e => e.stopPropagation()}
                aria-hidden="false"
            >
                <div className="p-4 border-b border-gray-100 flex items-center gap-3">
                    <svg
                        width="20" height="20" viewBox="0 0 24 24" fill="none"
                        stroke="currentColor" strokeWidth="2" strokeLinecap="round" strokeLinejoin="round"
                        className="text-gray-400"
                        aria-hidden="true"
                    >
                        <circle cx="11" cy="11" r="8"></circle>
                        <line x1="21" y1="21" x2="16.65" y2="16.65"></line>
                    </svg>
                    <input
                        ref={inputRef}
                        id="search-modal-input"
                        type="text"
                        placeholder="Search tasks and events..."
                        aria-label="Search tasks and events"
                        className="flex-1 text-lg outline-none text-gray-700 placeholder-gray-400"
                        value={query}
                        onChange={e => setQuery(e.target.value)}
                        onKeyDown={e => e.key === 'Escape' && onClose()}
                    />
                    <button
                        onClick={onClose}
                        aria-label="Close search"
                        className="text-gray-400 hover:text-gray-600"
                    >
                        <svg width="20" height="20" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2" strokeLinecap="round" strokeLinejoin="round" aria-hidden="true"><line x1="18" y1="6" x2="6" y2="18"></line><line x1="6" y1="6" x2="18" y2="18"></line></svg>
                    </button>
                </div>

                <div
                    className="max-h-[60vh] overflow-y-auto"
                    role="region"
                    aria-label="Search results"
                    aria-live="polite"
                    aria-atomic="false"
                >
                    {results.length > 0 ? (
                        <ul className="py-2" role="list">
                            {results.map((result, idx) => (
                                <li key={`${result.type}-${result.item.id}-${idx}`} role="listitem">
                                    <button
                                        className="w-full px-4 py-3 hover:bg-gray-50 cursor-pointer flex items-center gap-3 border-b border-gray-50 last:border-0 text-left"
                                        onClick={() => {
                                            if (result.type === 'someday') {
                                                onClose();
                                                return;
                                            }
                                            const date = result.type === 'task'
                                                ? (result.item.scheduledDate ? new Date(result.item.scheduledDate) : new Date())
                                                : (new Date(result.item.startTime));
                                            onSelectTask(date);
                                            onClose();
                                        }}
                                        aria-label={`${result.type === 'task' ? 'Task' : result.type === 'someday' ? 'Someday task' : 'Event'}: ${result.item.title}${result.item.completed ? ', completed' : ''}`}
                                    >
                                        <div
                                            className={`p-2 rounded-full ${result.type === 'task' ? 'bg-blue-100 text-blue-600' : result.type === 'someday' ? 'bg-amber-100 text-amber-600' : 'bg-teal-100 text-teal-600'}`}
                                            aria-hidden="true"
                                        >
                                            {result.type === 'task' || result.type === 'someday' ? (
                                                <svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2" strokeLinecap="round" strokeLinejoin="round"><path d="M12 22c5.523 0 10-4.477 10-10S17.523 2 12 2 2 6.477 2 12s4.477 10 10 10z"></path><path d="m9 12 2 2 4-4"></path></svg>
                                            ) : (
                                                <svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2" strokeLinecap="round" strokeLinejoin="round"><rect x="3" y="4" width="18" height="18" rx="2" ry="2"></rect><line x1="16" y1="2" x2="16" y2="6"></line><line x1="8" y1="2" x2="8" y2="6"></line><line x1="3" y1="10" x2="21" y2="10"></line></svg>
                                            )}
                                        </div>
                                        <div className="flex-1">
                                            <div className="font-medium text-gray-800">{result.item.title}</div>
                                            <div className="text-xs text-gray-500">
                                                {result.type === 'someday'
                                                    ? `Someday \u2022 ${result.item.somedayListTitle}`
                                                    : format(
                                                        result.type === 'task'
                                                            ? (result.item.scheduledDate ? new Date(result.item.scheduledDate) : new Date())
                                                            : new Date(result.item.startTime),
                                                        'PPP'
                                                    )
                                                }
                                            </div>
                                        </div>
                                        {(result.type === 'task' || result.type === 'someday') && result.item.completed && (
                                            <span className="text-xs bg-gray-100 text-gray-500 px-2 py-1 rounded">Completed</span>
                                        )}
                                    </button>
                                </li>
                            ))}
                        </ul>
                    ) : query.trim() ? (
                        <p className="p-8 text-center text-gray-400" role="status">
                            No item found.
                        </p>
                    ) : (
                        <p className="p-8 text-center text-gray-400">
                            Start typing to search...
                        </p>
                    )}
                </div>
            </div>

            <style jsx>{`
                .slide-in-from-top-2 { animation: slideIn 0.2s ease-out; }
                @keyframes slideIn {
                    from { opacity: 0; transform: translateY(-10px); }
                    to { opacity: 1; transform: translateY(0); }
                }
            `}</style>
        </div>
    );
}