import React, { useState } from 'react';
import { X, Upload, Calendar, Plus, Trash2 } from 'lucide-react';

export default function AddBranchModal({ isOpen, onClose, onRefresh }) {
    const [loading, setLoading] = useState(false);
    const [formData, setFormData] = useState({
        name: '',
        location: '',
        manager_name: '',
        operational_start_date: '',
        payroll_from_day: 1,
        payroll_to_day: 28,
        salary_generation_day: 2,
    });

    const [docs, setDocs] = useState([
        { name: '', file: null, document_number: '', expiry_date: '', reminder_days: 30 },
    ]);

    const handleDocChange = (index, field, value) => {
        const newDocs = [...docs];
        newDocs[index][field] = value;
        setDocs(newDocs);
    };

    const handleAddDoc = () => {
        setDocs([...docs, { name: '', file: null, document_number: '', expiry_date: '', reminder_days: 30 }]);
    };

    const handleRemoveDoc = (index) => {
        if (docs.length > 1) {
            setDocs(docs.filter((_, i) => i !== index));
        } else {
            // Just clear the first one if it's the only one
            const newDocs = [...docs];
            newDocs[0] = { name: '', file: null, document_number: '', expiry_date: '', reminder_days: 30 };
            setDocs(newDocs);
        }
    };

    const handleSubmit = async (e) => {
        e.preventDefault();
        setLoading(true);

        const data = new FormData();
        data.append('name', formData.name);
        data.append('location', formData.location);
        data.append('manager_name', formData.manager_name);
        data.append('operational_start_date', formData.operational_start_date);
        data.append('payroll_from_day', formData.payroll_from_day);
        data.append('payroll_to_day', formData.payroll_to_day);
        data.append('salary_generation_day', formData.salary_generation_day);

        docs.forEach((doc, index) => {
            if (doc.file) {
                data.append(`docs[${index}][file]`, doc.file);
                data.append(`docs[${index}][name]`, doc.name || `Document ${index + 1}`);
                data.append(`docs[${index}][document_number]`, doc.document_number || '');
                data.append(`docs[${index}][expiry_date]`, doc.expiry_date);
                data.append(`docs[${index}][reminder_days]`, doc.reminder_days || 30);
            }
        });

        try {
            const res = await fetch('/api/branches', {
                method: 'POST',
                headers: {
                    'X-CSRF-TOKEN': document.querySelector('meta[name="csrf-token"]').content,
                },
                body: data,
            });

            if (res.ok) {
                onRefresh();
                onClose();
            } else {
                const err = await res.json();
                alert(err.message || 'Error creating branch');
            }
        } catch (error) {
            alert('An error occurred. Please try again.');
        } finally {
            setLoading(false);
        }
    };

    if (!isOpen) return null;

    return (
        <div className="fixed inset-0 z-[100] flex items-center justify-center p-4 bg-black/50 backdrop-blur-sm animate-in fade-in duration-300">
            <div className="bg-white w-full max-w-3xl rounded-xl shadow-2xl overflow-hidden animate-in zoom-in-95 duration-300 flex flex-col max-h-[90vh]">
                {/* Header */}
                <div className="px-6 py-4 border-b border-gray-100 flex flex-shrink-0 items-center justify-between">
                    <h2 className="text-xl font-bold text-gray-900">Add New Branch</h2>
                    <button onClick={onClose} className="p-2 hover:bg-gray-100 rounded-lg transition-all text-gray-400 hover:text-gray-900">
                        <X size={20} />
                    </button>
                </div>

                <form onSubmit={handleSubmit} className="p-6 space-y-6 overflow-y-auto no-scrollbar">
                    <div className="space-y-6">
                        {/* Basic Info */}
                        <div className="space-y-4">
                            <h3 className="text-lg font-bold text-gray-900 flex items-center gap-2">
                                <Plus size={18} className="text-red-500" />
                                Branch Information
                            </h3>
                            
                            <div className="space-y-4">
                                <div>
                                    <label className="block text-sm font-medium text-gray-700 mb-1">Branch Name</label>
                                    <input 
                                        type="text" required 
                                        className="w-full px-3 py-2 bg-white border border-gray-200 rounded-lg focus:outline-none focus:ring-2 focus:ring-red-500/20 focus:border-red-500 transition-all text-sm"
                                        value={formData.name}
                                        onChange={(e) => setFormData({...formData, name: e.target.value})}
                                    />
                                </div>
                                <div>
                                    <label className="block text-sm font-medium text-gray-700 mb-1">Location</label>
                                    <input 
                                        type="text" required
                                        className="w-full px-3 py-2 bg-white border border-gray-200 rounded-lg focus:outline-none focus:ring-2 focus:ring-red-500/20 focus:border-red-500 transition-all text-sm"
                                        value={formData.location}
                                        onChange={(e) => setFormData({...formData, location: e.target.value})}
                                    />
                                </div>
                                <div className="grid grid-cols-2 gap-4">
                                    <div>
                                        <label className="block text-sm font-medium text-gray-700 mb-1">Manager Name</label>
                                        <input 
                                            type="text" required
                                            className="w-full px-3 py-2 bg-white border border-gray-200 rounded-lg focus:outline-none focus:ring-2 focus:ring-red-500/20 focus:border-red-500 transition-all text-sm"
                                            value={formData.manager_name}
                                            onChange={(e) => setFormData({...formData, manager_name: e.target.value})}
                                        />
                                    </div>
                                    <div>
                                        <label className="block text-sm font-medium text-gray-700 mb-1">Status</label>
                                        <select 
                                            className="w-full px-3 py-2 bg-white border border-gray-200 rounded-lg focus:outline-none focus:ring-2 focus:ring-red-500/20 focus:border-red-500 transition-all text-sm"
                                            value="Active"
                                            readOnly
                                        >
                                            <option value="Active">Active</option>
                                        </select>
                                    </div>
                                </div>
                                    <div>
                                        <label className="block text-sm font-medium text-gray-700 mb-1">Branch Start Date</label>
                                        <input 
                                            type="date" required
                                            className="w-full px-3 py-2 bg-white border border-gray-200 rounded-lg focus:outline-none focus:ring-2 focus:ring-red-500/20 focus:border-red-500 transition-all text-sm"
                                            value={formData.operational_start_date}
                                            onChange={(e) => setFormData({...formData, operational_start_date: e.target.value})}
                                        />
                                    </div>

                                <div className="p-6 bg-red-50/50 rounded-2xl border border-red-100 space-y-4">
                                    <h4 className="text-sm font-bold text-red-900 flex items-center gap-2 underline decoration-red-200 underline-offset-4">
                                        <Calendar size={16} />
                                        PAYROLL CYCLE CONFIGURATION
                                    </h4>
                                    
                                    <div className="grid grid-cols-3 gap-4">
                                        <div>
                                            <label className="block text-[10px] font-black text-red-900/60 uppercase tracking-widest mb-1.5">Cycle From (Day)</label>
                                            <input 
                                                type="number" min="1" max="31" required
                                                className="w-full px-4 py-2.5 bg-white border border-red-100 rounded-xl focus:outline-none focus:ring-4 focus:ring-red-500/10 focus:border-red-500 transition-all text-sm font-bold"
                                                value={formData.payroll_from_day}
                                                onChange={(e) => setFormData({...formData, payroll_from_day: e.target.value})}
                                            />
                                        </div>
                                        <div>
                                            <label className="block text-[10px] font-black text-red-900/60 uppercase tracking-widest mb-1.5">Cycle To (Day)</label>
                                            <input 
                                                type="number" min="1" max="31" required
                                                className="w-full px-4 py-2.5 bg-white border border-red-100 rounded-xl focus:outline-none focus:ring-4 focus:ring-red-500/10 focus:border-red-500 transition-all text-sm font-bold"
                                                value={formData.payroll_to_day}
                                                onChange={(e) => setFormData({...formData, payroll_to_day: e.target.value})}
                                            />
                                        </div>
                                        <div>
                                            <label className="block text-[10px] font-black text-red-900/60 uppercase tracking-widest mb-1.5">Generate On (Day)</label>
                                            <input 
                                                type="number" min="1" max="31" required
                                                className="w-full px-4 py-2.5 bg-white border border-red-100 rounded-xl focus:outline-none focus:ring-4 focus:ring-red-500/10 focus:border-red-500 transition-all text-sm font-bold"
                                                value={formData.salary_generation_day}
                                                onChange={(e) => setFormData({...formData, salary_generation_day: e.target.value})}
                                            />
                                        </div>
                                    </div>
                                    <p className="text-[10px] text-red-600/80 font-medium italic">
                                        Example: From 1 To 28, Generated on 2nd of next month.
                                    </p>
                                </div>
                            </div>
                        </div>
                        <div className="space-y-6">
                            <div className="flex items-center justify-between">
                                <h3 className="text-lg font-bold text-gray-900 flex items-center gap-2">
                                    <Upload size={18} className="text-red-500" />
                                    Branch Documents
                                </h3>
                                <button 
                                    type="button"
                                    onClick={handleAddDoc}
                                    className="flex items-center gap-2 px-4 py-2 bg-red-50 text-red-600 rounded-xl text-xs font-bold hover:bg-red-100 transition-all border border-red-100"
                                >
                                    <Plus size={14} />
                                    <span>Add Another</span>
                                </button>
                            </div>

                            <div className="space-y-6">
                                {docs.map((doc, index) => (
                                    <div key={index} className="p-6 bg-gray-50 rounded-[2rem] border border-gray-100 space-y-4 relative group">
                                        <div className="flex items-center justify-between">
                                            <span className="text-xs font-bold text-gray-900 uppercase tracking-wider">Document {index + 1}</span>
                                            <button 
                                                type="button" 
                                                onClick={() => handleRemoveDoc(index)} 
                                                className="text-rose-500 p-2 hover:bg-rose-100 rounded-xl transition-all opacity-0 group-hover:opacity-100"
                                                title="Remove Document"
                                            >
                                                <Trash2 size={16} />
                                            </button>
                                        </div>

                                        <div className="space-y-3">
                                            <input 
                                                type="text" 
                                                placeholder="Document Name (e.g. Trade License)"
                                                className="w-full px-4 py-2.5 bg-white border border-gray-100 rounded-xl text-xs font-bold transition-all outline-none focus:border-red-500"
                                                value={doc.name}
                                                onChange={(e) => handleDocChange(index, 'name', e.target.value)}
                                                required
                                            />
                                            
                                            <div className="grid grid-cols-4 gap-3">
                                                <div className="relative">
                                                    <input 
                                                        type="file"
                                                        className="hidden"
                                                        id={`file-${index}`}
                                                        onChange={(e) => handleDocChange(index, 'file', e.target.files[0])}
                                                        required={!doc.file}
                                                    />
                                                    <label htmlFor={`file-${index}`} className={`flex items-center justify-center gap-2 w-full py-2.5 rounded-xl border-2 border-dashed transition-all cursor-pointer text-xs font-bold ${doc.file ? 'bg-emerald-50 border-emerald-200 text-emerald-600' : 'bg-white border-gray-200 text-gray-400 hover:border-red-500 hover:text-red-500'}`}>
                                                        <Upload size={14} />
                                                        {doc.file ? (doc.file.name ? doc.file.name.substring(0, 5) + '...' : 'Uploaded') : 'Upload File'}
                                                    </label>
                                                </div>
                                                <div>
                                                    <input 
                                                        type="text"
                                                        placeholder="Doc Number"
                                                        className="w-full px-4 py-2 bg-white border border-gray-100 rounded-xl text-[10px] font-bold transition-all outline-none focus:border-red-500"
                                                        value={doc.document_number}
                                                        onChange={(e) => handleDocChange(index, 'document_number', e.target.value)}
                                                    />
                                                    <p className="text-[8px] text-gray-400 mt-0.5 ml-1 font-bold">Doc Number</p>
                                                </div>
                                                <div>
                                                    <input 
                                                        type="date"
                                                        className="w-full px-4 py-2 bg-white border border-gray-100 rounded-xl text-[10px] font-bold transition-all outline-none focus:border-red-500"
                                                        value={doc.expiry_date}
                                                        onChange={(e) => handleDocChange(index, 'expiry_date', e.target.value)}
                                                        required
                                                    />
                                                    <p className="text-[8px] text-gray-400 mt-0.5 ml-1 font-bold">Expiry Date</p>
                                                </div>
                                                <div>
                                                    <input 
                                                        type="number"
                                                        placeholder="Remind (Days)"
                                                        className="w-full px-4 py-2 bg-white border border-gray-100 rounded-xl text-[10px] font-bold transition-all outline-none focus:border-red-500"
                                                        value={doc.reminder_days}
                                                        onChange={(e) => handleDocChange(index, 'reminder_days', e.target.value)}
                                                        required
                                                    />
                                                    <p className="text-[8px] text-gray-400 mt-0.5 ml-1 font-bold">Days Before</p>
                                                </div>
                                            </div>
                                        </div>
                                    </div>
                                ))}
                            </div>
                        </div>
                    </div>

                    {/* Submit */}
                    <div className="flex flex-shrink-0 items-center justify-end gap-3 pt-4 sticky bottom-0 bg-white">
                        <button type="button" onClick={onClose} className="px-4 py-2 bg-gray-100 text-gray-700 rounded-lg hover:bg-gray-200 transition-all text-sm font-medium">Cancel</button>
                        <button 
                            type="submit" 
                            disabled={loading}
                            className="px-4 py-2 bg-red-500 text-white rounded-lg hover:bg-red-600 transition-all text-sm font-medium disabled:opacity-50"
                        >
                            {loading ? 'Saving...' : 'Save Branch'}
                        </button>
                    </div>
                </form>
            </div>
        </div>
    );
}