'use client';
import React, { useState, ChangeEvent, FormEvent } from 'react';
import IconTrashLines from '../icon/icon-trash-lines';
import axios from 'axios';
import { useRouter } from 'next/navigation';
import { buildApiUrl } from '@/utils/BaseUrl.utils';

interface FormErrors {
    [key: string]: string;
}
interface EditEventFormProps {
    eventId: string | null;
}

const CreateEventGalleryForm: React.FC<EditEventFormProps> = ({ eventId }) => {
    const router = useRouter();

    const [linkInput, setLinkInput] = useState('');
    const [loading, setLoading] = useState(false);
    const [errors, setErrors] = useState<FormErrors>({});

    const parsedLinks = React.useMemo(() => {
        return linkInput.split(/[\n,]+/).map(l => l.trim()).filter(l => l !== '').map(link => {
            if (link.includes("drive.google.com")) {
                const match = link.match(/\/d\/([a-zA-Z0-9_-]+)/) || link.match(/id=([a-zA-Z0-9_-]+)/);
                if (match && match[1]) {
                    return `https://drive.google.com/thumbnail?id=${match[1]}&sz=w1000-h1000`;
                }
            }
            return link;
        });
    }, [linkInput]);

    const handleLinkInputChange = (e: ChangeEvent<HTMLTextAreaElement>) => {
        setLinkInput(e.target.value);
        if (parsedLinks.length > 20) {
            setErrors({ images: 'You can only add up to 20 images at a time' });
        } else {
            setErrors(prev => ({ ...prev, images: '' }));
        }
    };

    const handleImageDelete = (index: number) => {
        const lines = linkInput.split(/[\n,]+/).map(l => l.trim()).filter(l => l !== '');
        lines.splice(index, 1);
        setLinkInput(lines.join('\n'));
    };

    const validateForm = (): boolean => {
        const newErrors: FormErrors = {};

        if (parsedLinks.length === 0) {
            newErrors.images = 'Please provide at least one image link';
        } else if (parsedLinks.length > 20) {
            newErrors.images = 'Only 20 images can be added at a time';
        }

        setErrors(newErrors);
        return Object.keys(newErrors).length === 0;
    };

    const handleSubmit = async (e: FormEvent) => {
        e.preventDefault();
        if (!validateForm()) return;

        setLoading(true);
        try {
            // Step 1: Prepare body for bulk save
            const body = {
                eventid: Number(eventId), 
                imageurl: parsedLinks   
            };

            console.log("Sending body:", body);

            // Step 3: Call bulk API
            const token = localStorage.getItem('token');
            await axios.post(
                buildApiUrl('event-images/bulk'),
                body,
                {
                    headers: {
                        Authorization: `Bearer ${token}`,
                    },
                }
            );

            router.push(`/event-gallery?eventid=${eventId}`);
        } catch (error: any) {
            console.error('Upload failed:', error);
            const message = error.response?.data?.message || 'Failed to upload images. Please try again.';
            setErrors({ submit: message });
            alert(message);
        } finally {
            setLoading(false);
        }
    };

    return (
        <form onSubmit={handleSubmit} className="max-w-4xl mx-auto p-6 bg-white rounded shadow-md">
            <h2 className="text-xl font-bold mb-4">Upload Gallery Images</h2>

            {/* Link Input */}
            <div className="mb-4">
                <label htmlFor="gallery" className="block font-medium mb-1">Image Links (Google Drive etc.)</label>
                <textarea
                    id="gallery"
                    rows={5}
                    placeholder="Paste your Google Drive links here, one per line..."
                    value={linkInput}
                    onChange={handleLinkInputChange}
                    className="w-full border rounded px-3 py-2"
                />
                {errors.images && <p className="text-red-500 text-sm">{errors.images}</p>}
                <p className="text-gray-500 text-xs mt-1">You can add up to 20 images.</p>
            </div>

            {/* Previews */}
            {parsedLinks.length > 0 && (
                <div className="grid grid-cols-2 md:grid-cols-4 gap-4 mb-6">
                    {parsedLinks.map((url, index) => (
                        <div key={index} className="relative border rounded shadow overflow-hidden">
                            <img
                                src={url}
                                alt={`Preview ${index + 1}`}
                                className="w-full h-40 object-cover"
                                onError={(e) => {
                                    (e.target as HTMLImageElement).src = "https://placehold.co/150x150?text=Invalid+Image+Link";
                                }}
                            />
                            <button
                                type="button"
                                onClick={() => handleImageDelete(index)}
                                className="absolute top-1 right-1 bg-red-600 text-white rounded-full p-1 hover:bg-red-700"
                            >
                                <IconTrashLines className="w-4 h-4" />
                            </button>
                        </div>
                    ))}
                </div>
            )}

            {/* Submit */}
            <div className="mt-6">
                <button
                    type="submit"
                    disabled={loading}
                    className={`bg-blue-600 text-white px-6 py-2 rounded hover:bg-blue-700 ${loading ? 'opacity-50 cursor-not-allowed' : ''}`}
                >
                    {loading ? 'Uploading...' : 'Submit'}
                </button>
            </div>
        </form>
    );
};

export default CreateEventGalleryForm;