/**
 * doc-picker.js — Document / Audio corpus picker for tool pages.
 *
 * Wires the "Select from My Docs" and "Select from My Audio" buttons.
 * Free-tier (SSO) users see an upgrade modal instead of the picker.
 * Paid (CaveauAI) users get a searchable multi-select modal backed by
 * /api/dashboard/documents.php?action=list.
 */
(function () {
    'use strict';

    // ── Tier detection ────────────────────────────────────────────────────────
    // DBN_FREE_TIER_BALANCE is set only for SSO (free) users.
    // Paid CaveauAI sessions have it undefined.
    function isPaidUser() {
        return window.DBN_TOOLS_AUTHENTICATED === true
            && typeof window.DBN_FREE_TIER_BALANCE === 'undefined';
    }

    // ── Upgrade modal ─────────────────────────────────────────────────────────
    var upgradeBackdrop = document.getElementById('docPickerUpgradeBackdrop');

    function showUpgradeModal() {
        if (upgradeBackdrop) upgradeBackdrop.hidden = false;
    }

    if (upgradeBackdrop) {
        var upgradeClose = upgradeBackdrop.querySelector('.doc-picker-upgrade-card__dismiss');
        if (upgradeClose) {
            upgradeClose.addEventListener('click', function () {
                upgradeBackdrop.hidden = true;
            });
        }
        upgradeBackdrop.addEventListener('click', function (e) {
            if (e.target === upgradeBackdrop) upgradeBackdrop.hidden = true;
        });
    }

    // ── Shared picker state ───────────────────────────────────────────────────
    var backdrop = document.getElementById('docPickerBackdrop');
    var searchEl = backdrop ? backdrop.querySelector('.doc-picker-dialog__search') : null;
    var listEl   = backdrop ? backdrop.querySelector('.doc-picker-list') : null;
    var countEl  = backdrop ? backdrop.querySelector('.doc-picker-dialog__count') : null;
    var confirmBtn = backdrop ? backdrop.querySelector('.doc-picker-dialog__confirm') : null;
    var titleEl  = backdrop ? backdrop.querySelector('.doc-picker-dialog__head h3') : null;

    var _allDocs = [];        // full list from API
    var _selected = {};       // { id: { id, title } }
    var _mode = 'text';       // 'text' or 'audio'
    var _onConfirm = null;    // callback(selected)

    function openPicker(mode, onConfirm) {
        _mode = mode || 'text';
        _onConfirm = onConfirm;
        _allDocs = [];

        if (titleEl) {
            titleEl.textContent = mode === 'audio' ? 'Select from My Audio' : 'Select from My Docs';
        }
        if (searchEl) searchEl.value = '';
        if (listEl) listEl.innerHTML = '<p class="doc-picker-list__loading">Loading…</p>';
        if (backdrop) backdrop.hidden = false;

        var url = '/api/dashboard/documents.php?action=list&status=ready&limit=100';
        if (mode === 'audio') url += '&source_type=audio';

        fetch(url, { credentials: 'same-origin' })
            .then(function (r) { return r.json(); })
            .then(function (data) {
                _allDocs = (data.documents || []);
                renderList(_allDocs);
            })
            .catch(function () {
                if (listEl) listEl.innerHTML = '<p class="doc-picker-list__empty">Could not load documents.</p>';
            });
    }

    function renderList(docs) {
        if (!listEl) return;
        if (!docs.length) {
            listEl.innerHTML = '<p class="doc-picker-list__empty">No documents found.</p>';
            return;
        }
        var html = docs.map(function (doc) {
            var id   = doc.id;
            var sel  = !!_selected[id];
            var meta = [];
            if (doc.word_count) meta.push(doc.word_count.toLocaleString() + ' words');
            if (doc.chunk_count) meta.push(doc.chunk_count + ' passages');
            if (doc.created_at) {
                try {
                    meta.push(new Date(doc.created_at.replace(' ', 'T') + 'Z')
                        .toLocaleDateString(undefined, { dateStyle: 'medium' }));
                } catch (_) {}
            }
            return '<div class="doc-item' + (sel ? ' is-selected' : '') + '" data-id="' + id + '" role="option" aria-selected="' + sel + '">'
                + '<input type="checkbox" ' + (sel ? 'checked' : '') + ' tabindex="-1" aria-hidden="true">'
                + '<div>'
                +   '<div class="doc-item__title">' + esc(doc.title || 'Untitled') + '</div>'
                +   (meta.length ? '<div class="doc-item__meta">' + esc(meta.join(' · ')) + '</div>' : '')
                + '</div>'
                + '</div>';
        }).join('');
        listEl.innerHTML = html;

        listEl.querySelectorAll('.doc-item').forEach(function (el) {
            el.addEventListener('click', function () {
                var id = parseInt(el.dataset.id, 10);
                var doc = _allDocs.find(function (d) { return d.id === id; });
                if (!doc) return;
                if (_selected[id]) {
                    delete _selected[id];
                } else {
                    if (_mode === 'audio') {
                        // single-select for audio
                        _selected = {};
                    }
                    _selected[id] = { id: id, title: doc.title || 'Untitled' };
                }
                var cb = el.querySelector('input[type="checkbox"]');
                if (cb) cb.checked = !!_selected[id];
                el.classList.toggle('is-selected', !!_selected[id]);
                el.setAttribute('aria-selected', !!_selected[id]);
                updateCount();
            });
        });
        updateCount();
    }

    function updateCount() {
        var n = Object.keys(_selected).length;
        if (countEl) countEl.textContent = n ? n + ' selected' : '';
        if (confirmBtn) confirmBtn.disabled = !n;
    }

    function filterList(q) {
        if (!q) return renderList(_allDocs);
        var lower = q.toLowerCase();
        renderList(_allDocs.filter(function (d) {
            return (d.title || '').toLowerCase().includes(lower);
        }));
    }

    if (searchEl) {
        searchEl.addEventListener('input', function () { filterList(searchEl.value.trim()); });
    }

    if (confirmBtn) {
        confirmBtn.addEventListener('click', function () {
            var sel = Object.values(_selected);
            if (backdrop) backdrop.hidden = true;
            if (_onConfirm) _onConfirm(sel);
        });
    }

    if (backdrop) {
        var closeBtn = backdrop.querySelector('.doc-picker-dialog__close');
        if (closeBtn) closeBtn.addEventListener('click', function () { backdrop.hidden = true; });
        backdrop.addEventListener('click', function (e) {
            if (e.target === backdrop) backdrop.hidden = true;
        });
        document.addEventListener('keydown', function (e) {
            if (e.key === 'Escape' && !backdrop.hidden) backdrop.hidden = true;
        });
    }

    function esc(s) {
        return String(s).replace(/[&<>"]/g, function (c) {
            return { '&': '&amp;', '<': '&lt;', '>': '&gt;', '"': '&quot;' }[c];
        });
    }

    // ── Chip rendering ────────────────────────────────────────────────────────
    function renderChips(chipsEl, items, onRemove) {
        if (!chipsEl) return;
        chipsEl.innerHTML = items.map(function (item) {
            return '<span class="doc-chip" data-id="' + item.id + '">'
                + '<span class="doc-chip__label">' + esc(item.title) + '</span>'
                + '<button type="button" class="doc-chip__remove" aria-label="Remove ' + esc(item.title) + '">&times;</button>'
                + '</span>';
        }).join('');
        chipsEl.querySelectorAll('.doc-chip__remove').forEach(function (btn) {
            btn.addEventListener('click', function (e) {
                e.stopPropagation();
                var id = parseInt(btn.closest('.doc-chip').dataset.id, 10);
                if (onRemove) onRemove(id);
            });
        });
    }

    // ── Text doc picker wiring ────────────────────────────────────────────────
    var docPickerBtn   = document.getElementById('docPickerBtn');
    var docPickerIds   = document.getElementById('docPickerIds');
    var docPickerChips = document.getElementById('docPickerChips');

    var _textSelected = {};

    function syncTextPicker() {
        if (docPickerIds) {
            docPickerIds.value = Object.keys(_textSelected).join(',');
        }
        renderChips(docPickerChips, Object.values(_textSelected), function (id) {
            delete _textSelected[id];
            delete _selected[id];
            syncTextPicker();
        });
    }

    if (docPickerBtn) {
        docPickerBtn.addEventListener('click', function () {
            if (!window.DBN_TOOLS_AUTHENTICATED) return; // shouldn't happen
            if (!isPaidUser()) { showUpgradeModal(); return; }
            _selected = Object.assign({}, _textSelected);
            openPicker('text', function (sel) {
                _textSelected = {};
                sel.forEach(function (s) { _textSelected[s.id] = s; });
                syncTextPicker();
            });
        });
    }

    // ── Audio picker wiring ───────────────────────────────────────────────────
    var audioPickerBtn   = document.getElementById('audioPickerBtn');
    var audioPickerDocId = document.getElementById('audioPickerDocId');
    var audioPickerChips = document.getElementById('audioPickerChips');

    var _audioSelected = null; // single item or null

    function syncAudioPicker() {
        if (audioPickerDocId) {
            audioPickerDocId.value = _audioSelected ? String(_audioSelected.id) : '';
        }
        renderChips(audioPickerChips, _audioSelected ? [_audioSelected] : [], function () {
            _audioSelected = null;
            syncAudioPicker();
        });
    }

    if (audioPickerBtn) {
        audioPickerBtn.addEventListener('click', function () {
            if (!window.DBN_TOOLS_AUTHENTICATED) return;
            if (!isPaidUser()) { showUpgradeModal(); return; }
            _selected = _audioSelected ? { [_audioSelected.id]: _audioSelected } : {};
            openPicker('audio', function (sel) {
                _audioSelected = sel.length ? sel[0] : null;
                syncAudioPicker();
            });
        });
    }

    // ── Audio corpus save button (inside transcribe page) ─────────────────────
    // Allows saving an audio file from the upload queue to the corpus.
    var audioCorpusSaveBtn = document.getElementById('audioCorpusSaveBtn');
    if (audioCorpusSaveBtn && isPaidUser()) {
        audioCorpusSaveBtn.hidden = false;
        audioCorpusSaveBtn.addEventListener('click', function () {
            var audioInput = document.getElementById('audioInput');
            if (!audioInput || !audioInput.files.length) {
                alert('Add an audio file first.');
                return;
            }
            var file = audioInput.files[0];
            var fd = new FormData();
            fd.append('audio', file, file.name);
            audioCorpusSaveBtn.disabled = true;
            audioCorpusSaveBtn.textContent = 'Saving…';
            fetch('/api/dashboard/audio-upload.php', { method: 'POST', credentials: 'same-origin', body: fd })
                .then(function (r) { return r.json(); })
                .then(function (data) {
                    if (!data.ok) throw new Error(data.error || 'Upload failed');
                    audioCorpusSaveBtn.textContent = 'Saved ✓';
                    setTimeout(function () {
                        audioCorpusSaveBtn.textContent = 'Save to My Audio';
                        audioCorpusSaveBtn.disabled = false;
                    }, 2500);
                })
                .catch(function (err) {
                    alert('Could not save audio: ' + err.message);
                    audioCorpusSaveBtn.textContent = 'Save to My Audio';
                    audioCorpusSaveBtn.disabled = false;
                });
        });
    }

}());