/**
 * NIS2 Agile - Knowledge Base UI (Migration 012-014)
 *
 * Gestisce upload documento, listing, search semantica con visibilita' multi-livello.
 */

(function () {
    'use strict';

    function getJwt() {
        try {
            return localStorage.getItem('nis2_access_token') || sessionStorage.getItem('nis2_access_token') || '';
        } catch (e) { return ''; }
    }

    function authHeaders() {
        return {
            'Content-Type': 'application/json',
            'Authorization': 'Bearer ' + getJwt(),
        };
    }

    function escHtml(s) {
        var d = document.createElement('div');
        d.textContent = s == null ? '' : String(s);
        return d.innerHTML;
    }

    function fmtScopeBadge(scope) {
        return '<span class="kb-scope-badge ' + escHtml(scope) + '">' + escHtml(scope) + '</span>';
    }

    var btnUpload = document.getElementById('btn-kb-upload');
    var btnSubmit = document.getElementById('btn-kb-submit');
    var btnCancel = document.getElementById('btn-kb-cancel');
    var btnSearch = document.getElementById('btn-kb-search');
    var formCard  = document.getElementById('kb-form-card');
    var statusEl  = document.getElementById('kb-status');
    var listEl    = document.getElementById('kb-doc-list');
    var resultsEl = document.getElementById('kb-search-results');
    var shareSel  = document.getElementById('kb-shared-with');

    if (!btnUpload || !formCard) return;

    function setupScopeForUser() {
        // Decodifica JWT per estrarre role e consulting_firm_id
        var jwt = getJwt();
        if (!jwt) return;
        try {
            var payload = JSON.parse(atob(jwt.split('.')[1]));
            // Il JWT NIS2 contiene solo user_id; chiamo /api/auth/me per role + firm
            fetch('/api/auth/me', { headers: authHeaders() })
                .then(function (r) { return r.json(); })
                .then(function (res) {
                    var u = (res && res.data && (res.data.user || res.data)) || {};
                    var role = u.role || '';
                    var firmId = u.consulting_firm_id || null;

                    var optSystem = document.querySelector('[data-scope-opt="SYSTEM"]');
                    var optFirm = document.querySelector('[data-scope-opt="FIRM"]');
                    var optOrg = document.querySelector('[data-scope-opt="ORG"]');

                    if (role === 'super_admin' && optSystem) optSystem.style.display = 'inline-flex';
                    if (firmId && optFirm) optFirm.style.display = 'inline-flex';
                    if (optOrg) optOrg.style.display = 'inline-flex';

                    if (firmId) loadFirmOrgs();
                });
        } catch (e) { /* ignore */ }
    }

    function loadFirmOrgs() {
        if (!shareSel) return;
        fetch('/api/knowledgebase/firmOrgs', { headers: authHeaders() })
            .then(function (r) { return r.json(); })
            .then(function (res) {
                var orgs = (res && res.data && res.data.organizations) || [];
                if (!orgs.length) {
                    shareSel.innerHTML = '<option value="">Nessuna organizzazione nello studio</option>';
                    return;
                }
                shareSel.innerHTML = orgs.map(function (o) {
                    var label = o.name + (o.vat_number ? ' (P.IVA ' + o.vat_number + ')' : '');
                    return '<option value="' + o.id + '">' + escHtml(label) + '</option>';
                }).join('');
            }).catch(function () {
                shareSel.innerHTML = '<option value="">Errore caricamento organizzazioni</option>';
            });
    }

    function loadDocList() {
        if (!listEl) return;
        listEl.innerHTML = '<div class="text-muted">Caricamento...</div>';
        fetch('/api/knowledgebase/list', { headers: authHeaders() })
            .then(function (r) { return r.json(); })
            .then(function (res) {
                var docs = (res && res.data && res.data.documents) || [];
                if (!docs.length) {
                    listEl.innerHTML = '<div class="text-muted">Nessun documento visibile</div>';
                    return;
                }
                listEl.innerHTML = docs.map(function (d) {
                    return '<div class="kb-doc-row">' +
                        '<div>' +
                            '<strong>' + escHtml(d.title) + '</strong> ' + fmtScopeBadge(d.scope) +
                            '<div style="font-size:.78rem;color:var(--gray-500);">' +
                                escHtml(d.entity_type || '') + ' &middot; ' + (d.chunk_count || 0) + ' chunk &middot; ' + escHtml(d.created_at) +
                            '</div>' +
                        '</div>' +
                        '<button class="btn btn-sm btn-danger" data-del-id="' + d.id + '">Elimina</button>' +
                    '</div>';
                }).join('');
                // Wire delete buttons
                listEl.querySelectorAll('[data-del-id]').forEach(function (btn) {
                    btn.addEventListener('click', function () {
                        if (!confirm('Eliminare definitivamente questo documento dalla KB?')) return;
                        var id = this.getAttribute('data-del-id');
                        fetch('/api/knowledgebase/' + id, {
                            method: 'DELETE',
                            headers: authHeaders(),
                        }).then(function (r) { return r.json(); }).then(function (res) {
                            if (res && res.success) loadDocList();
                            else alert('Errore: ' + ((res && res.message) || 'sconosciuto'));
                        });
                    });
                });
            }).catch(function () {
                listEl.innerHTML = '<div class="text-danger">Errore caricamento</div>';
            });
    }

    btnUpload.addEventListener('click', function () {
        var visible = formCard.style.display !== 'none';
        formCard.style.display = visible ? 'none' : 'block';
        if (!visible) setupScopeForUser();
    });

    btnCancel.addEventListener('click', function () { formCard.style.display = 'none'; });

    document.querySelectorAll('input[name="kb-scope"]').forEach(function (r) {
        r.addEventListener('change', function () {
            var block = document.getElementById('kb-share-block');
            if (block) block.style.display = (this.value === 'FIRM') ? 'block' : 'none';
        });
    });

    btnSubmit.addEventListener('click', function () {
        var title = (document.getElementById('kb-title') || {}).value || '';
        var text  = (document.getElementById('kb-text') || {}).value || '';
        var entityType = (document.getElementById('kb-entity-type') || {}).value || 'custom';
        var scopeEl = document.querySelector('input[name="kb-scope"]:checked');
        var scope = scopeEl ? scopeEl.value : 'ORG';

        if (!title.trim()) { statusEl.textContent = 'Inserisci un titolo'; statusEl.style.color = '#ef4444'; return; }
        if (text.length < 50) { statusEl.textContent = 'Testo troppo breve (min 50 caratteri)'; statusEl.style.color = '#ef4444'; return; }

        var sharedWith = [];
        if (scope === 'FIRM' && shareSel) {
            for (var i = 0; i < shareSel.options.length; i++) {
                if (shareSel.options[i].selected && shareSel.options[i].value) {
                    sharedWith.push(parseInt(shareSel.options[i].value, 10));
                }
            }
        }

        btnSubmit.disabled = true;
        statusEl.style.color = '#0ea5e9';
        statusEl.textContent = 'Indicizzazione in corso...';

        fetch('/api/knowledgebase/ingest', {
            method: 'POST',
            headers: authHeaders(),
            body: JSON.stringify({
                title: title.trim(),
                text: text,
                entity_type: entityType,
                scope: scope,
                shared_with_orgs: sharedWith,
            }),
        }).then(function (r) { return r.json().then(function (j) { return { ok: r.ok, body: j }; }); })
          .then(function (res) {
            btnSubmit.disabled = false;
            if (res.ok && res.body && res.body.success !== false) {
                var d = res.body.data || res.body;
                statusEl.style.color = '#22C55E';
                statusEl.textContent = 'Documento indicizzato (' + (d.scope || scope) + ', ' + (d.chunks || '?') + ' chunk)' +
                    (sharedWith.length ? ' — condiviso con ' + sharedWith.length + ' org.' : '');
                document.getElementById('kb-title').value = '';
                document.getElementById('kb-text').value = '';
                loadDocList();
            } else {
                statusEl.style.color = '#ef4444';
                statusEl.textContent = 'Errore: ' + ((res.body && res.body.message) || 'sconosciuto');
            }
        }).catch(function (e) {
            btnSubmit.disabled = false;
            statusEl.style.color = '#ef4444';
            statusEl.textContent = 'Errore di rete: ' + (e.message || '');
        });
    });

    btnSearch.addEventListener('click', function () {
        var q = (document.getElementById('kb-search-query') || {}).value || '';
        if (!q.trim()) return;
        resultsEl.innerHTML = '<div class="text-muted">Ricerca in corso...</div>';
        fetch('/api/knowledgebase/search', {
            method: 'POST',
            headers: authHeaders(),
            body: JSON.stringify({ query: q.trim(), top_k: 5 }),
        }).then(function (r) { return r.json(); })
          .then(function (res) {
            var hits = (res && res.data && res.data.results) || [];
            if (!hits.length) {
                resultsEl.innerHTML = '<div class="text-muted">Nessun risultato</div>';
                return;
            }
            resultsEl.innerHTML = hits.map(function (h, i) {
                return '<div style="padding:10px;border:1px solid var(--gray-100);border-radius:6px;margin-bottom:8px;">' +
                    '<div><strong>[' + (i + 1) + '] ' + escHtml(h.title) + '</strong> ' +
                    fmtScopeBadge(h.scope) + ' <span style="font-size:.72rem;color:var(--gray-500);">score=' + h.score + '</span></div>' +
                    '<div style="font-size:.84rem;color:var(--gray-700);margin-top:6px;line-height:1.4;">' +
                    escHtml(h.content.substring(0, 300)) + (h.content.length > 300 ? '...' : '') +
                    '</div></div>';
            }).join('');
        });
    });

    // Carica lista al boot
    loadDocList();
})();