@extends('layouts.app')

@section('title', 'Edit Subject')

@section('content')
<div class="min-h-screen bg-gray-50 py-8">
    <div class="max-w-2xl mx-auto px-4 sm:px-6 lg:px-8">
        <!-- Header -->
        <div class="mb-8">
            <div class="flex items-center">
                <a href="{{ route('subjects.index') }}" 
                   class="inline-flex items-center text-sm font-medium text-gray-500 hover:text-gray-700 mr-4">
                    <svg class="w-4 h-4 mr-1" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                        <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M10 19l-7-7m0 0l7-7m-7 7h18"></path>
                    </svg>
                    Back to Subjects
                </a>
            </div>
        </div>

        <div class="mb-8">
            <div class="flex items-center">
                <div>
                    <h1 class="text-3xl font-bold text-gray-900">Edit Subject</h1>
                    <p class="mt-2 text-sm text-gray-600">Update the subject information</p>
                </div>
            </div>
        </div>

        <!-- Form Card -->
        <div class="bg-white shadow-sm rounded-lg overflow-hidden">
            <div class="px-6 py-4 border-b border-gray-200 bg-gray-50">
                <div class="flex items-center justify-between">
                    <div>
                        <h2 class="text-lg font-medium text-gray-900">Subject Details</h2>
                        <p class="mt-1 text-sm text-gray-500">Update the subject name and save changes</p>
                    </div>
                    <div class="flex items-center px-3 py-1 bg-blue-100 rounded-full">
                        <svg class="w-4 h-4 text-blue-600 mr-1" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                            <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M13 16h-1v-4h-1m1-4h.01M21 12a9 9 0 11-18 0 9 9 0 0118 0z"></path>
                        </svg>
                        <span class="text-sm font-medium text-blue-700">Editing</span>
                    </div>
                </div>
            </div>

            <form action="{{ route('subjects.update', $subject) }}" method="POST" class="p-6">
                @csrf 
                @method('PUT')

                <!-- Current Value Display -->
                <div class="mb-6 p-4 bg-gray-50 rounded-lg border border-gray-200">
                    <div class="flex items-center justify-between">
                        <div>
                            <p class="text-sm font-medium text-gray-500">Current Subject Name</p>
                            <p class="text-lg font-semibold text-gray-900 mt-1">{{ $subject->name }}</p>
                        </div>
                        <div class="flex items-center text-sm text-gray-500">
                            <svg class="w-4 h-4 mr-1" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                                <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M12 8v4l3 3m6-3a9 9 0 11-18 0 9 9 0 0118 0z"></path>
                            </svg>
                            Created {{ $subject->created_at->diffForHumans() }}
                        </div>
                    </div>
                </div>

                <!-- Name Field -->
                <div class="space-y-2">
                    <label for="name" class="block text-sm font-medium text-gray-700">
                        New Subject Name <span class="text-red-500">*</span>
                    </label>
                    <div class="relative">
                        <input type="text" 
                               id="name" 
                               name="name" 
                               value="{{ old('name', $subject->name) }}"
                               placeholder="Enter new subject name"
                               class="block w-full px-4 py-3 border border-gray-300 rounded-lg shadow-sm placeholder-gray-400 focus:ring-2 focus:ring-blue-500 focus:border-blue-500 transition duration-150 ease-in-out @error('name') border-red-300 focus:ring-red-500 focus:border-red-500 @enderror"
                               required
                               autofocus>
                        <div class="absolute inset-y-0 right-0 pr-3 flex items-center pointer-events-none">
                            <svg class="h-5 w-5 text-gray-400" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                                <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M11 5H6a2 2 0 00-2 2v11a2 2 0 002 2h11a2 2 0 002-2v-5m-1.414-9.414a2 2 0 112.828 2.828L11.828 15H9v-2.828l8.586-8.586z"></path>
                            </svg>
                        </div>
                    </div>
                    
                    @error('name')
                        <div class="flex items-center mt-1 text-sm text-red-600">
                            <svg class="w-4 h-4 mr-1" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                                <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M12 8v4m0 4h.01M21 12a9 9 0 11-18 0 9 9 0 0118 0z"></path>
                            </svg>
                            {{ $message }}
                        </div>
                    @enderror
                    
                    <p class="text-xs text-gray-500 mt-1">
                        Enter the updated name for this subject
                    </p>
                </div>

                <!-- Change Indicator -->
                <div id="changeIndicator" class="mt-4 p-3 bg-yellow-50 border border-yellow-200 rounded-lg hidden">
                    <div class="flex items-center">
                        <svg class="w-4 h-4 text-yellow-600 mr-2" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                            <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M12 9v2m0 4h.01m-6.938 4h13.856c1.54 0 2.502-1.667 1.732-2.5L13.732 4c-.77-.833-1.964-.833-2.732 0L4.35 16.5c-.77.833.192 2.5 1.732 2.5z"></path>
                        </svg>
                        <span class="text-sm text-yellow-800 font-medium">You've made changes to this subject</span>
                    </div>
                </div>

                <!-- Form Actions -->
                <div class="mt-8 pt-6 border-t border-gray-200 flex flex-col-reverse sm:flex-row sm:justify-end sm:space-x-3">
                    <a href="{{ route('subjects.index') }}" 
                       class="mt-3 sm:mt-0 inline-flex justify-center items-center px-4 py-3 border border-gray-300 shadow-sm text-sm font-medium rounded-lg text-gray-700 bg-white hover:bg-gray-50 focus:outline-none focus:ring-2 focus:ring-offset-2 focus:ring-blue-500 transition duration-150 ease-in-out">
                        <svg class="w-4 h-4 mr-2" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                            <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M6 18L18 6M6 6l12 12"></path>
                        </svg>
                        Cancel
                    </a>
                    <button type="submit" 
                            id="submitBtn"
                            class="inline-flex justify-center items-center px-6 py-3 border border-transparent text-sm font-medium rounded-lg shadow-sm text-white bg-blue-600 hover:bg-blue-700 focus:outline-none focus:ring-2 focus:ring-offset-2 focus:ring-blue-500 transition duration-150 ease-in-out">
                        <svg class="w-4 h-4 mr-2" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                            <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M5 13l4 4L19 7"></path>
                        </svg>
                        Update Subject
                    </button>
                </div>
            </form>
        </div>

        <!-- Danger Zone -->
        <div class="mt-8 bg-white shadow-sm rounded-lg overflow-hidden border border-red-200">
            <div class="px-6 py-4 border-b border-red-200 bg-red-50">
                <h2 class="text-lg font-medium text-red-900 flex items-center">
                    <svg class="w-5 h-5 mr-2" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                        <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M12 9v2m0 4h.01m-6.938 4h13.856c1.54 0 2.502-1.667 1.732-2.5L13.732 4c-.77-.833-1.964-.833-2.732 0L4.35 16.5c-.77.833.192 2.5 1.732 2.5z"></path>
                    </svg>
                    Danger Zone
                </h2>
            </div>
            <div class="p-6">
                <div class="flex flex-col sm:flex-row sm:items-center sm:justify-between">
                    <div class="mb-4 sm:mb-0">
                        <h3 class="text-sm font-medium text-red-800">Delete this subject</h3>
                        <p class="text-sm text-red-600 mt-1">Once deleted, this subject cannot be recovered.</p>
                    </div>
                    <form action="{{ route('subjects.destroy', $subject) }}" method="POST" class="inline">
                        @csrf 
                        @method('DELETE')
                        <button type="button" 
                                onclick="confirmDelete()"
                                class="inline-flex items-center px-4 py-2 border border-transparent text-sm font-medium rounded-md text-white bg-red-600 hover:bg-red-700 focus:outline-none focus:ring-2 focus:ring-offset-2 focus:ring-red-500 transition duration-150 ease-in-out">
                            <svg class="w-4 h-4 mr-2" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                                <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M19 7l-.867 12.142A2 2 0 0116.138 21H7.862a2 2 0 01-1.995-1.858L5 7m5 4v6m4-6v6m1-10V4a1 1 0 00-1-1h-4a1 1 0 00-1 1v3M4 7h16"></path>
                            </svg>
                            Delete Subject
                        </button>
                    </form>
                </div>
            </div>
        </div>
    </div>
</div>

<!-- Delete Confirmation Modal -->
<div id="deleteModal" class="fixed inset-0 bg-gray-600 bg-opacity-50 overflow-y-auto h-full w-full hidden z-50">
    <div class="relative top-20 mx-auto p-5 border w-96 shadow-lg rounded-md bg-white">
        <div class="mt-3 text-center">
            <div class="mx-auto flex items-center justify-center h-12 w-12 rounded-full bg-red-100">
                <svg class="h-6 w-6 text-red-600" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                    <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M12 9v2m0 4h.01m-6.938 4h13.856c1.54 0 2.502-1.667 1.732-2.5L13.732 4c-.77-.833-1.964-.833-2.732 0L4.35 16.5c-.77.833.192 2.5 1.732 2.5z"></path>
                </svg>
            </div>
            <h3 class="text-lg leading-6 font-medium text-gray-900 mt-2">Delete Subject</h3>
            <div class="mt-2 px-7 py-3">
                <p class="text-sm text-gray-500">
                    Are you sure you want to delete "<strong>{{ $subject->name }}</strong>"? This action cannot be undone and all associated data will be permanently removed.
                </p>
            </div>
            <div class="flex justify-center space-x-3 mt-4">
                <button onclick="closeDeleteModal()"
                        class="px-4 py-2 bg-gray-300 text-gray-700 text-sm font-medium rounded-md hover:bg-gray-400 focus:outline-none focus:ring-2 focus:ring-gray-500">
                    Cancel
                </button>
                <form action="{{ route('subjects.destroy', $subject) }}" method="POST" class="inline">
                    @csrf 
                    @method('DELETE')
                    <button type="submit"
                            class="px-4 py-2 bg-red-600 text-white text-sm font-medium rounded-md hover:bg-red-700 focus:outline-none focus:ring-2 focus:ring-red-500">
                        Yes, Delete Subject
                    </button>
                </form>
            </div>
        </div>
    </div>
</div>

<script>
// Change detection
document.addEventListener('DOMContentLoaded', function() {
    const nameInput = document.getElementById('name');
    const changeIndicator = document.getElementById('changeIndicator');
    const originalValue = "{{ $subject->name }}";
    const submitBtn = document.getElementById('submitBtn');

    nameInput.addEventListener('input', function() {
        if (this.value !== originalValue) {
            changeIndicator.classList.remove('hidden');
            submitBtn.innerHTML = '<svg class="w-4 h-4 mr-2" fill="none" stroke="currentColor" viewBox="0 0 24 24"><path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M5 13l4 4L19 7"></path></svg>Save Changes';
        } else {
            changeIndicator.classList.add('hidden');
            submitBtn.innerHTML = '<svg class="w-4 h-4 mr-2" fill="none" stroke="currentColor" viewBox="0 0 24 24"><path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M5 13l4 4L19 7"></path></svg>Update Subject';
        }
    });

    // Real-time validation
    nameInput.addEventListener('input', function() {
        const value = this.value;
        const isValid = value.length >= 2 && value.length <= 255;
        
        if (value.length > 0) {
            if (isValid) {
                this.classList.remove('border-red-300', 'focus:ring-red-500', 'focus:border-red-500');
                this.classList.add('border-green-300', 'focus:ring-green-500', 'focus:border-green-500');
            } else {
                this.classList.remove('border-green-300', 'focus:ring-green-500', 'focus:border-green-500');
                this.classList.add('border-red-300', 'focus:ring-red-500', 'focus:border-red-500');
            }
        }
    });
});

// Delete modal functions
function confirmDelete() {
    document.getElementById('deleteModal').classList.remove('hidden');
}

function closeDeleteModal() {
    document.getElementById('deleteModal').classList.add('hidden');
}

// Close modal when clicking outside
window.onclick = function(event) {
    const modal = document.getElementById('deleteModal');
    if (event.target === modal) {
        closeDeleteModal();
    }
}
</script>

<style>
/* Smooth transitions */
.transition {
    transition: all 0.2s ease-in-out;
}

/* Custom focus styles */
input:focus {
    outline: none;
    ring: 2px;
}

/* Animation for changes */
@keyframes highlight {
    0% { background-color: transparent; }
    50% { background-color: #fef3c7; }
    100% { background-color: transparent; }
}

.highlight {
    animation: highlight 2s ease-in-out;
}
</style>
@endsection