@extends('layouts.main')

@section('breadcrumbs')
    {{ Breadcrumbs::render(request()->route()->getName(), $daftarPustaka) }}
@endsection

@section('content')
<div class="grid gap-5 mx-auto w-full lg:gap-7.5">
    <form
        action="{{ isset($daftarPustaka->id) ? route('daftar-pustaka.update', $daftarPustaka->id) : route('daftar-pustaka.store') }}"
        method="POST">
        @csrf
        <div class="pb-2.5 border card border-agi-100">
            <div class="card-header bg-agi-50" id="basic_settings">
                <h3 class="card-title">
                    {{ $daftarPustaka->judul ?? '' }}
                </h3>
                <div class="flex gap-2 items-center">
                    <a href="{{ route('daftar-pustaka.index') }}" class="btn btn-xs btn-info">
                        <i class="ki-filled ki-exit-left"></i> Back
                    </a>
                </div>
            </div>
            <div class="grid gap-5 card-body">
                <div class="min-w-3xl">
                    <div class="flex flex-col p-4 h-full">
                        <div class="flex justify-between items-center mb-4">
                            <a href="{{ asset('storage/' . $daftarPustaka->attachment) }}" class="btn btn-primary btn-sm">
                                <i class="ki-duotone ki-cloud-download me-1"></i>
                                Download File
                            </a>
                        </div>

                        @php
                            $fileExtension = pathinfo($daftarPustaka->attachment, PATHINFO_EXTENSION);
                            $isPdf = strtolower($fileExtension) == 'pdf';
                            $imageExtensions = ['jpg', 'jpeg', 'png', 'gif', 'webp'];
                            $isImage = in_array(strtolower($fileExtension), $imageExtensions);
                            $fileUrl = asset('storage/' . $daftarPustaka->attachment);
                        @endphp

                        @if ($isPdf)
                            <canvas id="pdfViewer" class="w-full rounded border touch-pan-y"></canvas>
                            <div class="flex gap-3 justify-center mt-3">
                                <button type="button" id="prevPage" class="btn btn-primary btn-sm">Previous</button>
                                <span>Page: <span id="pageNum">1</span> / <span id="pageCount">0</span></span>
                                <button type="button" id="nextPage" class="btn btn-primary btn-sm">Next</button>
                            </div>
                        @elseif ($isImage)
                            <img src="{{ $fileUrl }}" class="object-contain w-full rounded" />
                        @else
                            <p class="text-red-500">File tidak bisa ditampilkan, silakan
                                <a href="{{ $fileUrl }}" class="text-blue-500 underline" download>unduh di sini</a>.
                            </p>
                        @endif
                    </div>
                </div>

                <div class="border border-t"></div>
                <div>
                    {{ $daftarPustaka->deskripsi ?? '' }}
                </div>
            </div>
        </div>
    </form>
</div>
@endsection

@push('scripts')
<!-- PDF.js CDN -->
<script src="https://cdnjs.cloudflare.com/ajax/libs/pdf.js/3.11.174/pdf.min.js"></script>
<script>
document.addEventListener('DOMContentLoaded', function () {
    const url = @json($fileUrl);

    if (url.endsWith('.pdf')) {
        const pdfjsLib = window['pdfjs-dist/build/pdf'];
        pdfjsLib.GlobalWorkerOptions.workerSrc = 'https://cdnjs.cloudflare.com/ajax/libs/pdf.js/3.11.174/pdf.worker.min.js';

        let pdfDoc = null;
        let pageNum = 1;
        let pageRendering = false;
        let pageNumPending = null;
        const scale = 1.3;
        const canvas = document.getElementById('pdfViewer');
        const ctx = canvas.getContext('2d');

        function renderPage(num) {
            pageRendering = true;
            pdfDoc.getPage(num).then(function (page) {
                const viewport = page.getViewport({ scale: scale });
                canvas.height = viewport.height;
                canvas.width = viewport.width;

                const renderContext = {
                    canvasContext: ctx,
                    viewport: viewport
                };
                const renderTask = page.render(renderContext);

                renderTask.promise.then(function () {
                    pageRendering = false;
                    document.getElementById('pageNum').textContent = num;

                    if (pageNumPending !== null) {
                        renderPage(pageNumPending);
                        pageNumPending = null;
                    }
                });
            });
        }

        function queueRenderPage(num) {
            if (pageRendering) {
                pageNumPending = num;
            } else {
                renderPage(num);
            }
        }

        function onPrevPage() {
            if (pageNum <= 1) return;
            pageNum--;
            queueRenderPage(pageNum);
        }

        function onNextPage() {
            if (pageNum >= pdfDoc.numPages) return;
            pageNum++;
            queueRenderPage(pageNum);
        }

        document.getElementById('prevPage').addEventListener('click', onPrevPage);
        document.getElementById('nextPage').addEventListener('click', onNextPage);

        // Swipe gesture
        let touchStartX = 0;
        let touchEndX = 0;

        canvas.addEventListener('touchstart', function (e) {
            touchStartX = e.changedTouches[0].screenX;
        });

        canvas.addEventListener('touchend', function (e) {
            touchEndX = e.changedTouches[0].screenX;
            handleSwipe();
        });

        function handleSwipe() {
            const swipeThreshold = 50; // min distance for swipe
            if (touchEndX < touchStartX - swipeThreshold) {
                onNextPage();
            } else if (touchEndX > touchStartX + swipeThreshold) {
                onPrevPage();
            }
        }

        pdfjsLib.getDocument(url).promise.then(function (pdfDoc_) {
            pdfDoc = pdfDoc_;
            document.getElementById('pageCount').textContent = pdfDoc.numPages;
            renderPage(pageNum);
        });
    }
});
</script>
@endpush