/**
 * What is left of the item upload flows once the uploads themselves are
 * described.
 *
 * The audio file and the single file for an existing version are both one
 * described field apiece now (`crate::quasi::upload_field`), and the binder in
 * `upload.js` runs the presign chain behind each. What stays here is the part
 * that is not one file going to one place: the queue a new version is built
 * from, which is a version number, a label per file and three requests per
 * file, and the download and delete buttons on the version table.
 *
 * Loaded once in dashboard-item.html. Re-initializes on HTMX tab swap.
 * Reads item ID from data-item-id on the container element.
 * Depends on: upload.js (S3Uploader), the core module (csrfHeaders, showToast).
 */
(function() {
    function init() {
        initReplaceAudio();
        initVersionUpload();
    }

    // ── Audio ──

    /* The upload is described; what is not is the swap between the audio that
       is already there and the picker that replaces it. */
    function initReplaceAudio() {
        var replaceBtn = document.getElementById('replace-audio-btn');
        if (!replaceBtn) return;
        replaceBtn.addEventListener('click', function() {
            var cur = document.getElementById('current-audio');
            if (cur) cur.classList.add('hidden');
            document.getElementById('upload-area').classList.remove('hidden');
        });
    }

    // ── Version Upload ──

    function initVersionUpload() {
        var container = document.getElementById('version-upload');
        if (!container) return;
        var itemId = container.dataset.itemId;
        if (!itemId) return;

        var fileQueue = [];

        var uploader = new S3Uploader({
            filenameEl:  document.getElementById('version-upload-filename'),
            percentEl:   document.getElementById('version-upload-percent'),
            progressBar: document.getElementById('version-progress-bar'),
            speedEl:     document.getElementById('version-upload-speed'),
        });

        // The picker is the described field's own input: what it takes and how
        // many is `upload_field::version_queue`, and the rows below it are this
        // file's, because a queue with a label per row is not one file going to
        // one place.
        var versionFileInput = document.getElementById('version-files');
        var fileRows = document.getElementById('version-file-rows');

        if (versionFileInput) {
            versionFileInput.addEventListener('change', function() {
                for (var i = 0; i < this.files.length; i++) addFileRow(this.files[i]);
                this.value = '';
            });
        }

        function guessLabel(name) {
            var n = name.toLowerCase();
            if (n.indexOf('aarch64') !== -1 || n.indexOf('arm64') !== -1) return n.indexOf('appimage') !== -1 || n.indexOf('.deb') !== -1 ? 'Linux (aarch64)' : 'macOS (arm)';
            if (n.indexOf('x86_64') !== -1 || n.indexOf('amd64') !== -1 || n.indexOf('x64') !== -1) return n.indexOf('.exe') !== -1 || n.indexOf('.msi') !== -1 ? 'Windows (x64)' : 'Linux (x86_64)';
            if (n.indexOf('.dmg') !== -1) return 'macOS';
            if (n.indexOf('.msi') !== -1 || n.indexOf('.exe') !== -1) return 'Windows';
            if (n.indexOf('.appimage') !== -1 || n.indexOf('.deb') !== -1) return 'Linux';
            return '';
        }

        function addFileRow(file) {
            var idx = fileQueue.length;
            fileQueue.push({ file: file, idx: idx });
            var tr = document.createElement('tr');
            tr.dataset.idx = idx;
            tr.style.borderBottom = '1px solid var(--border)';
            tr.innerHTML =
                '<td style="padding: 0.4rem 0.5rem 0.4rem 0; font-size: 0.85rem; max-width: 200px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap;" title="' + escapeHtml(file.name) + '">' + escapeHtml(file.name) + '</td>' +
                '<td style="padding: 0.4rem 0.5rem;"><input type="text" class="version-label-input" data-idx="' + idx + '" value="' + escapeHtml(guessLabel(file.name)) + '" placeholder="e.g., macOS (arm)" style="width: 100%; padding: 0.25rem 0.4rem; font-size: 0.85rem;"></td>' +
                '<td style="padding: 0.4rem 0.5rem;"><button type="button" class="btn-secondary version-remove-file" data-idx="' + idx + '" style="padding: 0.2rem 0.5rem; font-size: 0.75rem;">Remove</button></td>';
            fileRows.appendChild(tr);

            tr.querySelector('.version-remove-file').addEventListener('click', function() {
                fileQueue[idx] = null;
                tr.remove();
            });
        }

        // Upload all button
        document.getElementById('create-version-btn').addEventListener('click', function() {
            var versionNumber = document.getElementById('new-version-number').value.trim();
            var changelog = document.getElementById('version-changelog').value.trim();
            var entries = fileQueue.filter(function(e) { return e !== null; });

            if (!versionNumber) { showToast('Please enter a version number.'); return; }
            if (entries.length === 0) { showToast('Please add at least one file.'); return; }

            this.disabled = true;
            this.textContent = 'Uploading...';
            document.getElementById('new-version-form').classList.add('hidden');
            document.getElementById('version-upload-progress').classList.remove('hidden');

            // Build queue display
            var queueEl = document.getElementById('version-upload-queue');
            queueEl.innerHTML = '';
            for (var q = 0; q < entries.length; q++) {
                var li = document.createElement('div');
                li.id = 'queue-item-' + entries[q].idx;
                li.style.cssText = 'display: flex; align-items: center; gap: 0.5rem; padding: 0.3rem 0; font-size: 0.85rem;';
                var labelInput = document.querySelector('.version-label-input[data-idx="' + entries[q].idx + '"]');
                var labelText = labelInput ? labelInput.value.trim() : '';
                var displayName = escapeHtml(entries[q].file.name) + (labelText ? ' (' + escapeHtml(labelText) + ')' : '');
                li.innerHTML = '<span class="queue-status" style="width: 1.5em; text-align: center; opacity: 0.5;">-</span><span style="flex: 1;">' + displayName + '</span><span class="queue-size" style="opacity: 0.5;">' + formatSize(entries[q].file.size) + '</span>';
                queueEl.appendChild(li);
            }

            uploadSequentially(entries, 0, versionNumber, changelog);
        });

        function formatSize(bytes) {
            if (bytes > 1024 * 1024) return (bytes / (1024 * 1024)).toFixed(1) + ' MB';
            if (bytes > 1024) return (bytes / 1024).toFixed(0) + ' KB';
            return bytes + ' B';
        }

        function updateQueueStatus(idx, status) {
            var el = document.getElementById('queue-item-' + idx);
            if (!el) return;
            var s = el.querySelector('.queue-status');
            if (status === 'uploading') { s.textContent = '...'; s.style.opacity = '1'; }
            else if (status === 'done') { s.textContent = 'OK'; s.style.opacity = '0.7'; el.style.opacity = '0.6'; }
            else if (status === 'error') { s.textContent = '!'; s.style.color = 'var(--error, #c0392b)'; s.style.opacity = '1'; }
        }

        function uploadSequentially(entries, i, versionNumber, changelog) {
            if (i >= entries.length) {
                document.getElementById('version-upload-progress').classList.add('hidden');
                document.getElementById('version-upload-success').classList.remove('hidden');
                setTimeout(function() {
                    var filesBtn = document.getElementById('tab-files');
                    if (filesBtn) filesBtn.click();
                }, 1500);
                return;
            }

            var entry = entries[i];
            var labelInput = document.querySelector('.version-label-input[data-idx="' + entry.idx + '"]');
            var label = labelInput ? labelInput.value.trim() : '';

            updateQueueStatus(entry.idx, 'uploading');
            uploader.filenameEl.textContent = entry.file.name + (entries.length > 1 ? ' (' + (i + 1) + '/' + entries.length + ')' : '');

            fetch('/api/items/' + itemId + '/versions', {
                method: 'POST',
                headers: { 'Content-Type': 'application/json', ...csrfHeaders() },
                body: JSON.stringify({
                    version_number: versionNumber,
                    changelog: changelog || null,
                    label: label || null
                })
            })
            .then(function(res) {
                if (!res.ok) return res.json().catch(function() { return {}; }).then(function(d) {
                    throw new Error(d.error || 'Failed to create version');
                });
                return res.json();
            })
            .then(function(data) {
                return fetch('/api/versions/' + data.id + '/upload/presign', {
                    method: 'POST',
                    headers: { 'Content-Type': 'application/json', ...csrfHeaders() },
                    body: JSON.stringify({
                        file_name: entry.file.name,
                        content_type: entry.file.type || 'application/octet-stream'
                    })
                }).then(function(res) {
                    if (!res.ok) return res.json().catch(function() { return {}; }).then(function(d) {
                        throw new Error(d.error || 'Failed to get upload URL');
                    });
                    return res.json();
                }).then(function(presign) {
                    if (presign.max_file_bytes && entry.file.size > presign.max_file_bytes) {
                        var limitMB = (presign.max_file_bytes / (1024 * 1024)).toFixed(0);
                        var fileMB = (entry.file.size / (1024 * 1024)).toFixed(1);
                        throw new Error(entry.file.name + ': ' + fileMB + ' MB exceeds ' + limitMB + ' MB limit');
                    }
                    return uploader.upload(presign.upload_url, entry.file, presign.s3_key, 'application/octet-stream', presign.cache_control)
                        .then(function(s3Key) { return { s3Key: s3Key, versionId: data.id }; });
                });
            })
            .then(function(result) {
                return fetch('/api/versions/' + result.versionId + '/upload/confirm', {
                    method: 'POST',
                    headers: { 'Content-Type': 'application/json', ...csrfHeaders() },
                    body: JSON.stringify({ s3_key: result.s3Key, file_size_bytes: entry.file.size })
                });
            })
            .then(function(res) {
                if (!res.ok) return res.json().catch(function() { return {}; }).then(function(d) {
                    throw new Error(d.error || 'Failed to confirm upload');
                });
                return res.json().catch(function() { return {}; });
            })
            .then(function(confirmData) {
                if (confirmData && confirmData.pending_review) {
                    showToast('Version upload held for review: our scanner flagged it.', 'warning');
                }
                updateQueueStatus(entry.idx, 'done');
                uploadSequentially(entries, i + 1, versionNumber, changelog);
            })
            .catch(function(err) {
                updateQueueStatus(entry.idx, 'error');
                showVersionError(err.message || 'Upload failed');
            });
        }

        // Upload to an existing version. One described field per version that
        // has no file yet, each carrying its own address, so pressing the
        // button reveals that version's field and the binder in `upload.js`
        // does the rest.
        document.querySelectorAll('.upload-to-version-btn').forEach(function(btn) {
            btn.addEventListener('click', function() {
                var panel = document.getElementById('existing-version-upload-' + btn.dataset.versionId);
                if (!panel) return;
                document.getElementById('new-version-form').classList.add('hidden');
                panel.classList.remove('hidden');
            });
        });

        document.querySelectorAll('.cancel-existing-upload-btn').forEach(function(btn) {
            btn.addEventListener('click', function() {
                btn.closest('.existing-version-upload').classList.add('hidden');
                document.getElementById('new-version-form').classList.remove('hidden');
            });
        });

        document.querySelectorAll('.download-version-btn').forEach(function(btn) {
            btn.addEventListener('click', function() {
                fetch('/api/versions/' + btn.dataset.versionId + '/download')
                    .then(function(res) {
                        if (!res.ok) throw new Error('Failed to get download URL');
                        return res.json();
                    })
                    .then(function(data) { window.location.href = data.download_url; })
                    .catch(function(err) { showToast(err.message); });
            });
        });

        // The delete button is described: `crate::quasi::version_delete_act`,
        // Shape 3 step 4. Route, row, prompt and tone all live on the act, and
        // htmx performs it. The download button above stays here because its
        // route answers JSON carrying a presigned URL rather than the file.

        document.getElementById('cancel-version-upload-btn').addEventListener('click', function() {
            uploader.cancel();
            resetVersionUpload();
        });

        document.getElementById('retry-version-upload-btn').addEventListener('click', resetVersionUpload);

        function showVersionError(message) {
            document.getElementById('version-upload-progress').classList.add('hidden');
            document.getElementById('version-upload-error').classList.remove('hidden');
            document.getElementById('version-error-message').textContent = message;
        }

        function resetVersionUpload() {
            document.getElementById('new-version-form').classList.remove('hidden');
            document.querySelectorAll('.existing-version-upload').forEach(function(panel) {
                panel.classList.add('hidden');
            });
            document.getElementById('version-upload-progress').classList.add('hidden');
            document.getElementById('version-upload-success').classList.add('hidden');
            document.getElementById('version-upload-error').classList.add('hidden');
            fileQueue = [];
            fileRows.innerHTML = '';
            var btn = document.getElementById('create-version-btn');
            btn.disabled = false;
            btn.textContent = 'Upload All';
        }
    }

    // Run on initial load
    init();

    // Re-run when HTMX swaps in the files panel. Described strip, one region
    // per panel (`6b24f2df`); this used to be the strip's single container.
    document.body.addEventListener('htmx:after:settle', function(e) {
        if (e.target && e.target.id === 'item-files') {
            init();
        }
    });
})();