import React, { useState } from 'react';
import { format } from 'date-fns';
import './BookingForm.css';

const BookingForm = ({ service, resources, onSubmit, onCancel, loading }) => {
    const [formData, setFormData] = useState({
        resource: resources?.[0]?.id || '',
        date: '',
        time: '',
    });

    const [errors, setErrors] = useState({});

    const handleChange = (e) => {
        const { name, value } = e.target;
        setFormData(prev => ({ ...prev, [name]: value }));
        // Clear error for this field
        if (errors[name]) {
            setErrors(prev => ({ ...prev, [name]: '' }));
        }
    };

    const validate = () => {
        const newErrors = {};

        if (!formData.resource) {
            newErrors.resource = 'Please select a resource';
        }
        if (!formData.date) {
            newErrors.date = 'Please select a date';
        }
        if (!formData.time) {
            newErrors.time = 'Please select a time';
        }

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

    const handleSubmit = (e) => {
        e.preventDefault();

        if (!validate()) {
            return;
        }

        // Combine date and time into ISO format
        const startDateTime = new Date(`${formData.date}T${formData.time}`);
        const endDateTime = new Date(startDateTime.getTime() + service.duration * 60000);

        const appointmentData = {
            service: service.id,
            resource: parseInt(formData.resource),
            start_time: startDateTime.toISOString(),
            end_time: endDateTime.toISOString(),
        };

        onSubmit(appointmentData);
    };

    return (
        <div className="booking-form-container">
            <div className="booking-form-header">
                <h2>Book: {service.name}</h2>
                <button onClick={onCancel} className="close-btn">×</button>
            </div>

            <div className="service-summary">
                <p><strong>Duration:</strong> {service.duration} minutes</p>
                <p><strong>Price:</strong> ${service.price}</p>
            </div>

            <form onSubmit={handleSubmit} className="booking-form">
                <div className="form-group">
                    <label htmlFor="resource">Select Provider</label>
                    <select
                        id="resource"
                        name="resource"
                        value={formData.resource}
                        onChange={handleChange}
                        className={errors.resource ? 'error' : ''}
                    >
                        <option value="">Choose a provider...</option>
                        {resources?.map((resource) => (
                            <option key={resource.id} value={resource.id}>
                                {resource.name}
                            </option>
                        ))}
                    </select>
                    {errors.resource && <span className="error-message">{errors.resource}</span>}
                </div>

                <div className="form-group">
                    <label htmlFor="date">Date</label>
                    <input
                        type="date"
                        id="date"
                        name="date"
                        value={formData.date}
                        onChange={handleChange}
                        min={format(new Date(), 'yyyy-MM-dd')}
                        className={errors.date ? 'error' : ''}
                    />
                    {errors.date && <span className="error-message">{errors.date}</span>}
                </div>

                <div className="form-group">
                    <label htmlFor="time">Time</label>
                    <input
                        type="time"
                        id="time"
                        name="time"
                        value={formData.time}
                        onChange={handleChange}
                        className={errors.time ? 'error' : ''}
                    />
                    {errors.time && <span className="error-message">{errors.time}</span>}
                </div>

                <div className="form-actions">
                    <button type="button" onClick={onCancel} className="btn-cancel">
                        Cancel
                    </button>
                    <button type="submit" className="btn-submit" disabled={loading}>
                        {loading ? 'Booking...' : 'Confirm Booking'}
                    </button>
                </div>
            </form>
        </div>
    );
};

export default BookingForm;