import React, { useState, useEffect } from 'react';
import { X, Check, Loader } from 'lucide-react';

interface ImportListModalProps {
    isOpen: boolean;
    onClose: () => void;
    onImport: (selectedLists: { id: string, title: string }[]) => void;
    provider: 'google' | 'apple' | 'outlook' | 'synology' | null;
    lists: { id: string, title: string }[];
    isLoading: boolean;
}

export const ImportListModal: React.FC<ImportListModalProps> = ({
    isOpen,
    onClose,
    onImport,
    provider,
    lists,
    isLoading
}) => {
    const [selectedIds, setSelectedIds] = useState<string[]>([]);

    // Reset selection when opening
    useEffect(() => {
        if (isOpen) {
            setSelectedIds([]);
        }
    }, [isOpen]);

    if (!isOpen) return null;

    const toggleSelection = (id: string) => {
        if (selectedIds.includes(id)) {
            setSelectedIds(selectedIds.filter(lid => lid !== id));
        } else {
            setSelectedIds([...selectedIds, id]);
        }
    };

    const handleSelectAll = () => {
        if (selectedIds.length === lists.length) {
            setSelectedIds([]);
        } else {
            setSelectedIds(lists.map(l => l.id));
        }
    };

    return (
        <div style={{
            position: 'fixed',
            top: 0,
            left: 0,
            right: 0,
            bottom: 0,
            backgroundColor: 'rgba(0, 0, 0, 0.5)',
            display: 'flex',
            alignItems: 'center',
            justifyContent: 'center',
            zIndex: 1000
        }}>
            <div style={{
                background: 'white',
                padding: '2rem',
                borderRadius: '8px',
                width: '100%',
                maxWidth: '500px',
                maxHeight: '80vh',
                display: 'flex',
                flexDirection: 'column',
                gap: '1rem',
                boxShadow: '0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06)'
            }}>
                <div style={{ display: 'flex', justifyContent: 'space-between', alignItems: 'center' }}>
                    <h2 style={{ fontSize: '1.25rem', fontWeight: 600 }}>
                        Sync with {provider === 'google' ? 'Google Tasks' : provider === 'outlook' ? 'Microsoft To-Do' : 'Apple Reminders'}
                    </h2>
                    <button onClick={onClose} className="p-1 hover:bg-gray-100 rounded-full">
                        <X size={20} />
                    </button>
                </div>

                <div style={{ flex: 1, overflowY: 'auto', minHeight: '200px' }}>
                    {isLoading ? (
                        <div style={{ display: 'flex', justifyContent: 'center', alignItems: 'center', height: '100%' }}>
                            <div className="weekly-spinner"></div>
                            <span style={{ marginLeft: '8px' }}>Loading lists...</span>
                        </div>
                    ) : lists.length === 0 ? (
                        <p style={{ textAlign: 'center', color: '#666', marginTop: '2rem' }}>
                            No task lists found.
                        </p>
                    ) : (
                        <div style={{ display: 'flex', flexDirection: 'column', gap: '8px' }}>
                            <div style={{ display: 'flex', justifyContent: 'flex-end', marginBottom: '8px' }}>
                                <button
                                    onClick={handleSelectAll}
                                    style={{ fontSize: '0.875rem', color: '#3b82f6', background: 'none', border: 'none', cursor: 'pointer' }}
                                >
                                    {selectedIds.length === lists.length ? 'Deselect All' : 'Select All'}
                                </button>
                            </div>
                            {lists.map(list => (
                                <label
                                    key={list.id}
                                    style={{
                                        display: 'flex',
                                        alignItems: 'center',
                                        gap: '10px',
                                        padding: '8px',
                                        borderRadius: '4px',
                                        cursor: 'pointer',
                                        backgroundColor: selectedIds.includes(list.id) ? '#eff6ff' : 'transparent'
                                    }}
                                >
                                    <input
                                        type="checkbox"
                                        checked={selectedIds.includes(list.id)}
                                        onChange={() => toggleSelection(list.id)}
                                        style={{ width: '16px', height: '16px' }}
                                    />
                                    <span>{list.title}</span>
                                </label>
                            ))}
                        </div>
                    )}
                </div>

                <div style={{ display: 'flex', justifyContent: 'flex-end', gap: '1rem', marginTop: '1rem' }}>
                    <button
                        onClick={onClose}
                        style={{
                            padding: '8px 16px',
                            borderRadius: '4px',
                            border: '1px solid #e5e7eb',
                            background: 'white',
                            cursor: 'pointer'
                        }}
                    >
                        Cancel
                    </button>
                    <button
                        onClick={() => onImport(lists.filter(l => selectedIds.includes(l.id)))}
                        disabled={selectedIds.length === 0 || isLoading}
                        style={{
                            padding: '8px 16px',
                            borderRadius: '4px',
                            background: selectedIds.length === 0 || isLoading ? '#9ca3af' : '#2563eb',
                            color: 'white',
                            border: 'none',
                            cursor: selectedIds.length === 0 || isLoading ? 'not-allowed' : 'pointer',
                            display: 'flex',
                            alignItems: 'center',
                            gap: '8px'
                        }}
                    >
                        {isLoading ? 'Syncing...' : 'Sync Selected'}
                    </button>
                </div>
            </div>
        </div>
    );
};