@extends('layouts.side_bar')

@section('content')
<div class="container-fluid py-4">
    <div class="row justify-content-center">
        <div class="col-12 col-lg-8 col-xl-7">
            <div class="card border-0 shadow-sm mb-4 bg-info-subtle">
                <div class="card-body d-flex flex-wrap justify-content-between align-items-center gap-2 p-4">
                    <div>
                        <h2 class="h4 mb-1">Create Subject</h2>
                        <p class="text-secondary mb-0">Add a subject that can be linked to courses.</p>
                    </div>
                    <a href="{{ route('subjects.index') }}" class="btn btn-outline-secondary rounded-pill">Back to List</a>
                </div>
            </div>

            <div class="card border-0 shadow-sm">
                <div class="card-body p-4 p-lg-5">
                    <form method="POST" action="{{ route('subjects.store') }}" class="row g-3 js-confirm-submit" data-swal-title="Create subject?" data-swal-text="A new subject will be created." data-swal-confirm="Yes, create" data-swal-icon="question">
                        @csrf

                        <div class="col-12">
                            <label for="name" class="form-label">Subject Name</label>
                            <input id="name" type="text" name="name" value="{{ old('name') }}" class="form-control border-2 border-secondary-subtle @error('name') is-invalid @enderror" required>
                            @error('name')
                                <div class="invalid-feedback">{{ $message }}</div>
                            @enderror
                        </div>

                        <div class="col-12">
                            <label for="subject_code_preview" class="form-label">Subject Code</label>
                            <input id="subject_code_preview" type="text" class="form-control border-2 border-secondary-subtle" readonly>
                            <small class="text-secondary">Generated automatically from subject name and next subject number.</small>
                        </div>

                        <div class="col-12 d-flex gap-2 pt-2">
                            <button type="submit" class="btn btn-primary rounded-pill px-4">Save</button>
                            <a href="{{ route('subjects.index') }}" class="btn btn-outline-secondary">Cancel</a>
                        </div>
                    </form>
                </div>
            </div>
        </div>
    </div>
</div>
@endsection

@push('scripts')
<script>
    document.addEventListener('DOMContentLoaded', function () {
        const nameInput = document.getElementById('name');
        const codeInput = document.getElementById('subject_code_preview');
        const nextNumber = Number(@json($nextSubjectNumber));

        const buildCode = function (name, number) {
            let letters = String(name || '').replace(/[^a-zA-Z]/g, '').toUpperCase();

            if (!letters) {
                letters = 'SUB';
            }

            let withoutVowels = letters.replace(/[AEIOU]/g, '');
            let prefix = (withoutVowels || letters).slice(0, 3);

            if (prefix.length < 3) {
                prefix = prefix.padEnd(3, 'X');
            }

            return prefix + String(number).padStart(3, '0');
        };

        const updatePreview = function () {
            codeInput.value = buildCode(nameInput.value, nextNumber);
        };

        updatePreview();
        nameInput.addEventListener('input', updatePreview);
    });
</script>
@endpush