/* ════════════════════════════════════════════════════════════════
   QIP Diagnostic Imaging Accreditation Registration
   qip-diagnostic-imaging-registration.js

   Stripe integration mirrors AGPAL / ADA / SPAP pattern exactly:
     1. waitForToken / dataversePost / fetchLeadRef / spinner
     2. diaSubmit: validates page 7, then createAllRecords()
        Lead → Contact → PaymentEvidence → redirect to /agpal-stripe-checkout
     3. Stripe return handled by shared /agpal-stripe-return — no changes.

   Lead subject = page title:
     "QIP Diagnostic Imaging Registration – {practiceName}"

   Content Snippets required:
     dia/cc-surcharge-rate     0.01927
     dia/gst-rate              0.10
     agpal/contact-type-id     GUID (shared)
     stripe/flow-url           Power Automate checkout flow (shared)
     stripe/flow-url-verify    Power Automate verify flow (shared)

   sessionStorage keys (distinct from AGPAL/ADA/SPAP):
     dia_registration_lead_id
     dia_registration_lead_ref
     dia_registration_evidence_id
     dia_payment_in_progress
════════════════════════════════════════════════════════════════ */
(function () {
    'use strict';

    /* ── Config ──────────────────────────────────────── */
    var TOTAL_PAGES = 7;

    var LABELS = {
        1: 'Contact', 2: 'Details', 3: 'Practice',
        4: 'Address', 5: 'Modalities', 6: 'Standards', 7: 'Submit'
    };

    var FEE_MATRIX = {
        entry: { single: 590, '2-3': 975, '4-6': 1155, '7-9': 1635 },
        full: { single: 1765, '2-3': 2925, '4-6': 3470, '7-9': 4900 }
    };

    var PC = window.portalContext || {};

    var config = {
        ccSurchargeRate: parseFloat(PC.diaCCSurchargeRate) || 0.01927,
        gstRate: parseFloat(PC.diaGSTRate) || 0.10,
        contactTypeId: PC.contactTypeId || ''
    };

    var state = {
        currentPage: 1,
        sigCtx: null,
        sigDrawing: false,
        isBusy: false,
        leadId: null,
        leadRef: null,
        paymentEvidenceId: null,
        leadIdKey: 'dia_registration_lead_id',
        leadRefKey: 'dia_registration_lead_ref',
        evidenceIdKey: 'dia_registration_evidence_id',
        paymentInProgressKey: 'dia_payment_in_progress'
    };

    /* ════════════════════════════════════════════════════════════
       SPINNER
    ════════════════════════════════════════════════════════════ */
    function injectSpinner() {
        if (document.getElementById('dia-spinner-overlay')) return;
        var style = document.createElement('style');
        style.textContent =
            '@keyframes dia-spin{to{transform:rotate(360deg)}}' +
            '#dia-spinner-overlay{display:none;position:fixed;inset:0;background:rgba(26,58,74,0.65);' +
            'z-index:99999;align-items:center;justify-content:center;flex-direction:column;gap:18px;}';
        document.head.appendChild(style);
        var overlay = document.createElement('div');
        overlay.id = 'dia-spinner-overlay';
        overlay.setAttribute('aria-live', 'assertive');
        overlay.innerHTML =
            '<div style="width:52px;height:52px;border:5px solid rgba(255,255,255,0.25);' +
            'border-top-color:#fff;border-radius:50%;animation:dia-spin 0.7s linear infinite;"></div>' +
            '<div id="dia-spinner-msg" style="color:#fff;font-size:15px;font-weight:700;' +
            'text-align:center;padding:0 32px;max-width:320px;line-height:1.5;">Please wait\u2026</div>';
        document.body.appendChild(overlay);
    }

    function setBusy(busy, msg) {
        state.isBusy = busy;
        var overlay = document.getElementById('dia-spinner-overlay');
        var msgEl = document.getElementById('dia-spinner-msg');
        if (overlay) overlay.style.display = busy ? 'flex' : 'none';
        if (msgEl && msg) msgEl.textContent = msg;
        if (msgEl && !busy) msgEl.textContent = 'Please wait\u2026';
        document.querySelectorAll('button').forEach(function (btn) {
            if (busy) {
                btn.setAttribute('data-was-disabled', btn.disabled ? '1' : '0');
                btn.disabled = true;
            } else {
                btn.disabled = btn.getAttribute('data-was-disabled') === '1';
            }
        });
    }

    /* ════════════════════════════════════════════════════════════
       CSRF TOKEN
    ════════════════════════════════════════════════════════════ */
    function waitForToken() {
        return new Promise(function (resolve, reject) {
            var pc = window.portalContext || {};
            var cached = pc.csrfToken || pc.requestVerificationToken;
            if (cached && cached.length > 20) { resolve(cached); return; }
            var domEl = document.querySelector('input[name="__RequestVerificationToken"]');
            if (domEl && domEl.value) { resolve(domEl.value); return; }
            var csrfEl = document.getElementById('csrf-token-value');
            if (csrfEl && csrfEl.value && csrfEl.value.length > 20) { resolve(csrfEl.value); return; }
            var attempts = 0;
            var poll = setInterval(function () {
                attempts++;
                var pv = (window.portalContext || {}).csrfToken;
                if (pv && pv.length > 20) { clearInterval(poll); resolve(pv); return; }
                var el = document.getElementById('csrf-token-value');
                if (el && el.value && el.value.length > 20) { clearInterval(poll); resolve(el.value); return; }
                if (attempts >= 30) {
                    clearInterval(poll);
                    fetch('/Account/Login', { credentials: 'same-origin', headers: { 'Accept': 'text/html' } })
                        .then(function (r) { return r.text(); })
                        .then(function (html) {
                            var m = html.match(/name="__RequestVerificationToken"[^>]*value="([^"]+)"/);
                            if (!m) m = html.match(/value="([^"]{40,})"[^>]*name="__RequestVerificationToken"/);
                            if (m && m[1]) { resolve(m[1]); } else { reject(new Error('CSRF token not found')); }
                        })
                        .catch(function (e) { reject(new Error('CSRF fetch failed: ' + e.message)); });
                }
            }, 150);
        });
    }

    /* ════════════════════════════════════════════════════════════
       DATAVERSE API
    ════════════════════════════════════════════════════════════ */
    function extractEntityId(data, response) {
        if (data && typeof data === 'object') {
            var fromBody = data.leadid || data.contactid || data.ongc_paymentevidenceid;
            if (!fromBody && data['@odata.id']) {
                var m = data['@odata.id'].match(/\(([0-9a-f-]{36})\)/i);
                if (m) fromBody = m[1];
            }
            if (fromBody) return fromBody;
        }
        var headerVal = '';
        if (response && typeof response.headers === 'object' && typeof response.headers.get === 'function') {
            headerVal = response.headers.get('OData-EntityId') || '';
        }
        if (headerVal) {
            var m2 = headerVal.match(/[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}/i);
            if (m2) return m2[0];
        }
        return null;
    }

    async function dataversePost(entitySet, payload) {
        var url = '/_api/' + entitySet;
        var token = await waitForToken();
        var response = await fetch(url, {
            method: 'POST',
            headers: {
                'Content-Type': 'application/json',
                '__RequestVerificationToken': token,
                'OData-MaxVersion': '4.0',
                'OData-Version': '4.0',
                'Prefer': 'return=representation'
            },
            body: JSON.stringify(payload)
        });
        if (!response.ok) {
            var errMsg = 'API error ' + response.status;
            try { var errJson = await response.json(); errMsg = (errJson && errJson.error && errJson.error.message) || errMsg; } catch (e) { }
            throw new Error(errMsg);
        }
        var data = {};
        try { data = await response.json(); } catch (e) { }
        return { id: extractEntityId(data, response), data: data };
    }

    async function fetchLeadRef(leadId) {
        try {
            var token = await waitForToken();
            var r = await fetch('/_api/leads(' + leadId + ')?$select=ongc_leadrefid,ongc_clientid', {
                method: 'GET',
                headers: { '__RequestVerificationToken': token, 'OData-MaxVersion': '4.0', 'OData-Version': '4.0', 'Accept': 'application/json' }
            });
            if (!r.ok) return null;
            var d = await r.json();
            return (d && (d.ongc_leadrefid || d.ongc_clientid)) || null;
        } catch (e) { return null; }
    }

    /* ════════════════════════════════════════════════════════════
       SESSION STORAGE
    ════════════════════════════════════════════════════════════ */
    function clearSession() {
        [state.leadIdKey, state.leadRefKey, state.evidenceIdKey, state.paymentInProgressKey].forEach(function (k) {
            try { sessionStorage.removeItem(k); } catch (e) { }
        });
        state.leadId = null; state.leadRef = null; state.paymentEvidenceId = null;
    }

    function saveSession() {
        try {
            if (state.leadId) sessionStorage.setItem(state.leadIdKey, state.leadId);
            if (state.leadRef) sessionStorage.setItem(state.leadRefKey, state.leadRef);
            if (state.paymentEvidenceId) sessionStorage.setItem(state.evidenceIdKey, state.paymentEvidenceId);
        } catch (e) { }
    }

    /* ════════════════════════════════════════════════════════════
       HELPERS
    ════════════════════════════════════════════════════════════ */
    function round2(n) { return Math.round(n * 100) / 100; }

    function gVal(id) { var el = document.getElementById(id); return el ? el.value.trim() : ''; }

    function stripEmpty(payload) {
        Object.keys(payload).forEach(function (k) {
            if (payload[k] === '' || payload[k] === null || payload[k] === undefined) delete payload[k];
        });
        return payload;
    }

    /* ════════════════════════════════════════════════════════════
       FEE CALCULATION
    ════════════════════════════════════════════════════════════ */
    function getFeeBase() {
        var lvl = gVal('standardsLevel');
        var cnt = gVal('entryModalityCount') || gVal('fullModalityCount');
        return (lvl && cnt && FEE_MATRIX[lvl] && FEE_MATRIX[lvl][cnt]) ? FEE_MATRIX[lvl][cnt] : 0;
    }

    function calcFees() {
        var base = getFeeBase();
        var surcharge = round2(base * config.ccSurchargeRate);
        var gst = round2((base + surcharge) * config.gstRate);
        var total = round2(base + surcharge + gst);
        return { base: round2(base), surcharge: surcharge, gst: gst, total: total };
    }

    function diaUpdateFee() {
        var base = getFeeBase();
        var el = document.getElementById('diaFeeAmount');
        if (el) el.textContent = base > 0
            ? base.toLocaleString('en-AU', { minimumFractionDigits: 2 })
            : '0.00';
    }

    /* ════════════════════════════════════════════════════════════
       PROGRESS BAR
    ════════════════════════════════════════════════════════════ */
    function buildProgress() {
        var c = document.getElementById('diaProgressSteps');
        if (!c) return;
        c.innerHTML = '';
        for (var i = 1; i <= TOTAL_PAGES; i++) {
            var div = document.createElement('div');
            div.className = 'dia-step-item' +
                (state.currentPage === i ? ' active' : '') +
                (state.currentPage > i ? ' done' : '');
            div.innerHTML =
                '<div class="dia-step-dot">' + (state.currentPage > i ? '&#10003;' : i) + '</div>' +
                '<div class="dia-step-label">' + (LABELS[i] || i) + '</div>';
            c.appendChild(div);
        }
    }

    /* ════════════════════════════════════════════════════════════
       PAGE NAVIGATION
    ════════════════════════════════════════════════════════════ */
    function showPage(n) {
        if (state.isBusy && typeof n === 'number') return;
        document.querySelectorAll('.dia-form-page').forEach(function (el) { el.classList.remove('active'); });
        var target = (n === 'success')
            ? document.getElementById('diaSuccess')
            : document.querySelector('.dia-form-page[data-page="' + n + '"]');
        if (target) { target.classList.add('active'); window.scrollTo({ top: 0, behavior: 'smooth' }); }
        if (typeof n === 'number') state.currentPage = n;
        buildProgress();
        if (n === 6) { diaUpdateFee(); }
        if (n === 7) { initSig(); diaUpdateFee(); }
    }

    function diaNextPage(n) { if (!state.isBusy && validatePage(n)) showPage(n + 1); }
    function diaPrevPage(n) { if (!state.isBusy) showPage(n - 1); }

    /* ════════════════════════════════════════════════════════════
       VALIDATION
    ════════════════════════════════════════════════════════════ */
    function req(id, errId) {
        var el = document.getElementById(id);
        var err = document.getElementById(errId);
        var ok = el && el.value.trim() !== '';
        if (err) err.classList.toggle('visible', !ok);
        return ok;
    }

    function validatePage(n) {
        var ok = true;
        if (n === 1) {
            ok = req('contactFirstName', 'err_contactFirstName') && ok;
            ok = req('contactLastName', 'err_contactLastName') && ok;
            ok = req('contactPosition', 'err_contactPosition') && ok;
            ok = req('contactPhone', 'err_contactPhone') && ok;
            ok = req('contactEmail', 'err_contactEmail') && ok;
        }
        if (n === 2) {
            ok = req('lspnNumber', 'err_lspnNumber') && ok;
            ok = req('registeringType', 'err_registeringType') && ok;
            ok = req('providingType', 'err_providingType') && ok;
            ok = req('corporateGroup', 'err_corporateGroup') && ok;
            if (gVal('corporateGroup') === 'yes') ok = req('corporateName', 'err_corporateName') && ok;
            ok = req('previouslyAccredited', 'err_previouslyAccredited') && ok;
            if (gVal('previouslyAccredited') === 'yes') {
                ok = req('previousProvider', 'err_previousProvider') && ok;
                ok = req('previousExpiryDate', 'err_previousExpiryDate') && ok;
            }
            ok = req('sector', 'err_sector') && ok;
            if (gVal('sector') === 'other') ok = req('sectorOther', 'err_sectorOther') && ok;
        }
        if (n === 3) {
            ok = req('practiceName', 'err_practiceName') && ok;
            ok = req('practiceABN', 'err_practiceABN') && ok;
            ok = req('practicePhone', 'err_practicePhone') && ok;
            ok = req('practiceEmail', 'err_practiceEmail') && ok;
        }
        if (n === 4) {
            var cityOk = document.getElementById('streetCity') && document.getElementById('streetCity').value.trim();
            var stateOk = document.getElementById('streetState') && document.getElementById('streetState').value;
            var pcOk = document.getElementById('streetPostcode') && document.getElementById('streetPostcode').value.trim();
            var addrOk = cityOk && stateOk && pcOk;
            var addrErr = document.getElementById('err_streetAddress');
            if (addrErr) addrErr.classList.toggle('visible', !addrOk);
            ok = !!addrOk && ok;
            var postalYes = document.getElementById('postalYes');
            if (postalYes && postalYes.checked) {
                var pCityOk = document.getElementById('postalCity') && document.getElementById('postalCity').value.trim();
                var pStateOk = document.getElementById('postalState') && document.getElementById('postalState').value;
                var pPcOk = document.getElementById('postalPostcode') && document.getElementById('postalPostcode').value.trim();
                var postalOk = pCityOk && pStateOk && pPcOk;
                var postalErr = document.getElementById('err_postalAddress');
                if (postalErr) postalErr.classList.toggle('visible', !postalOk);
                ok = !!postalOk && ok;
            }
        }
        if (n === 5) {
            var selected = document.querySelectorAll('.dia-modality-cb:checked').length > 0;
            var modErr = document.getElementById('err_modalities');
            if (modErr) modErr.classList.toggle('visible', !selected);
            ok = selected && ok;
            ok = req('equipmentUnits', 'err_equipmentUnits') && ok;
        }
        if (n === 6) {
            ok = req('standardsLevel', 'err_standardsLevel') && ok;
            var lvl = gVal('standardsLevel');
            if (lvl === 'entry') ok = req('entryModalityCount', 'err_entryModalityCount') && ok;
            if (lvl === 'full') ok = req('fullModalityCount', 'err_fullModalityCount') && ok;
        }
        if (!ok) {
            var first = document.querySelector('.dia-error-msg.visible');
            if (first) first.scrollIntoView({ behavior: 'smooth', block: 'center' });
        }
        return ok;
    }

    /* ════════════════════════════════════════════════════════════
       CONDITIONALS
    ════════════════════════════════════════════════════════════ */
    function diaCorporateChange() { toggle('grp_corporateName', gVal('corporateGroup') === 'yes'); }
    function diaPrevAccreditedChange() { toggle('grp_previousDetails', gVal('previouslyAccredited') === 'yes'); }
    function diaSectorChange() { toggle('grp_sectorOther', gVal('sector') === 'other'); }
    function diaPostalToggle(val) { toggle('grp_postalAddress', val === 'yes'); }
    function diaStandardsChange() {
        var v = gVal('standardsLevel');
        toggle('grp_entryModalityCount', v === 'entry');
        toggle('grp_fullModalityCount', v === 'full');
        diaUpdateFee();
    }

    function toggle(id, show) { var el = document.getElementById(id); if (el) el.classList.toggle('show', show); }

    /* ════════════════════════════════════════════════════════════
       MODALITY CARDS
    ════════════════════════════════════════════════════════════ */
    function bindModalityCards() {
        document.querySelectorAll('.dia-modality-card').forEach(function (card) {
            card.addEventListener('click', function () {
                var cb = card.querySelector('.dia-modality-cb');
                if (cb) { cb.checked = !cb.checked; card.classList.toggle('selected', cb.checked); }
                updateModCount();
            });
        });
    }

    function updateModCount() {
        var count = document.querySelectorAll('.dia-modality-cb:checked').length;
        var el = document.getElementById('diaModCount');
        if (el) el.textContent = count + ' modalit' + (count === 1 ? 'y' : 'ies') + ' selected';
    }

    /* ════════════════════════════════════════════════════════════
       SIGNATURE CANVAS
    ════════════════════════════════════════════════════════════ */
    function initSig() {
        var c = document.getElementById('diaSignatureCanvas');
        if (!c) return;
        var fresh = c.cloneNode(true);
        c.parentNode.replaceChild(fresh, c);
        c = fresh;
        c.width = c.parentElement.clientWidth || 680;
        c.height = 120;
        state.sigCtx = c.getContext('2d');
        state.sigCtx.strokeStyle = '#1A3A4A';
        state.sigCtx.lineWidth = 2.2;
        state.sigCtx.lineCap = 'round';
        state.sigCtx.lineJoin = 'round';
        var ctx = state.sigCtx;
        function pos(e) { var r = c.getBoundingClientRect(); var pt = e.touches ? e.touches[0] : e; return { x: pt.clientX - r.left, y: pt.clientY - r.top }; }
        c.addEventListener('mousedown', function (e) { state.sigDrawing = true; ctx.beginPath(); var p = pos(e); ctx.moveTo(p.x, p.y); });
        c.addEventListener('mousemove', function (e) { if (!state.sigDrawing) return; var p = pos(e); ctx.lineTo(p.x, p.y); ctx.stroke(); });
        c.addEventListener('mouseup', function () { state.sigDrawing = false; });
        c.addEventListener('mouseleave', function () { state.sigDrawing = false; });
        c.addEventListener('touchstart', function (e) { e.preventDefault(); state.sigDrawing = true; ctx.beginPath(); var p = pos(e); ctx.moveTo(p.x, p.y); }, { passive: false });
        c.addEventListener('touchmove', function (e) { e.preventDefault(); if (!state.sigDrawing) return; var p = pos(e); ctx.lineTo(p.x, p.y); ctx.stroke(); }, { passive: false });
        c.addEventListener('touchend', function () { state.sigDrawing = false; });
    }

    function diaClearSig() {
        var c = document.getElementById('diaSignatureCanvas');
        if (state.sigCtx && c) state.sigCtx.clearRect(0, 0, c.width, c.height);
    }

    function isSigEmpty() {
        var c = document.getElementById('diaSignatureCanvas');
        if (!c || !state.sigCtx) return true;
        var d = state.sigCtx.getImageData(0, 0, c.width, c.height).data;
        for (var i = 3; i < d.length; i += 4) { if (d[i] > 0) return false; }
        return true;
    }

    /* ════════════════════════════════════════════════════════════
       PAYLOAD BUILDERS
    ════════════════════════════════════════════════════════════ */
    function buildLeadPayload() {
        var practiceName = gVal('practiceName');
        var postalDiff = document.getElementById('postalYes') && document.getElementById('postalYes').checked;
        var selected = [];
        document.querySelectorAll('.dia-modality-cb:checked').forEach(function (cb) { selected.push(cb.value); });

        var payload = {
            subject: 'QIP Diagnostic Imaging Registration \u2013 ' + practiceName,
            firstname: gVal('contactFirstName'),
            lastname: gVal('contactLastName') || practiceName,
            jobtitle: gVal('contactPosition'),
            emailaddress1: gVal('contactEmail'),
            telephone1: gVal('contactPhone'),
            companyname: practiceName,
            websiteurl: gVal('practiceWebsite'),
            leadsourcecode: 8,
            /* Street address */
            address1_line1: gVal('streetAddr0'),
            address1_line2: gVal('streetAddr1'),
            address1_city: gVal('streetCity'),
            address1_stateorprovince: gVal('streetState'),
            address1_postalcode: gVal('streetPostcode'),
            address1_country: 'Australia',
            /* Postal */
            address2_line1: postalDiff ? gVal('postalAddr0') : '',
            address2_line2: postalDiff ? gVal('postalAddr1') : '',
            address2_city: postalDiff ? gVal('postalCity') : '',
            address2_stateorprovince: postalDiff ? gVal('postalState') : '',
            address2_postalcode: postalDiff ? gVal('postalPostcode') : '',
            address2_country: postalDiff ? 'Australia' : '',
            /* Custom ONGC fields */
            ongc_enquirytype: 4,          /* 4 = Diagnostic Imaging */
            ongc_practicename: practiceName,
            ongc_practiceabn: gVal('practiceABN'),
            ongc_practicephone: gVal('practicePhone'),
            ongc_postalsameasstreet: !postalDiff,
            ongc_corporateentity: gVal('corporateName'),
            /* Diagnostic Imaging specific — stored in description */
            description: JSON.stringify({
                lspn: gVal('lspnNumber'),
                registeringType: gVal('registeringType'),
                providingType: gVal('providingType'),
                corporateGroup: gVal('corporateGroup'),
                previouslyAccredited: gVal('previouslyAccredited'),
                previousProvider: gVal('previousProvider'),
                previousExpiryDate: gVal('previousExpiryDate'),
                sector: gVal('sector'),
                sectorOther: gVal('sectorOther'),
                standardsLevel: gVal('standardsLevel'),
                modalities: selected.join(', '),
                equipmentUnits: gVal('equipmentUnits')
            })
        };
        return stripEmpty(payload);
    }

    function buildContactPayload() {
        var payload = {
            firstname: gVal('contactFirstName'),
            lastname: gVal('contactLastName'),
            jobtitle: gVal('contactPosition'),
            emailaddress1: gVal('contactEmail'),
            telephone1: gVal('contactPhone'),
            mobilephone: gVal('practicePhone')
        };
        if (state.leadId) {
            payload['originatingleadid@odata.bind'] = '/leads(' + state.leadId + ')';
        }
        if (config.contactTypeId) {
            payload['ongc_ContactType@odata.bind'] = '/ongc_contacttypes(' + config.contactTypeId + ')';
        }
        return stripEmpty(payload);
    }

    function buildPaymentEvidencePayload() {
        var fees = calcFees();
        var payload = {
            ongc_payername: (gVal('contactFirstName') + ' ' + gVal('contactLastName')).trim(),
            ongc_paymentamount: fees.base,
            ongc_surchargefee: fees.surcharge,
            ongc_gst: fees.gst,
            ongc_totalamount: fees.total,
            ongc_paymentstatus: 'pending-cc',
            ongc_transactionstatus: 'pending',
            ongc_paymentdate: new Date().toISOString(),
            ongc_responsemessage: 'Pending \u2013 QIP Diagnostic Imaging Stripe credit-card checkout initiated'
        };
        if (state.leadId) {
            payload['ongc_Lead@odata.bind'] = '/leads(' + state.leadId + ')';
        }
        return stripEmpty(payload);
    }

    /* ════════════════════════════════════════════════════════════
       RECORD CREATION CHAIN
    ════════════════════════════════════════════════════════════ */
    async function createAllRecords() {
        /* 1. Lead — critical */
        setBusy(true, 'Creating registration record\u2026');
        var lead = await dataversePost('leads', buildLeadPayload());
        state.leadId = lead.id;
        if (!state.leadId) throw new Error('Lead created but GUID not returned. Check Dataverse Web API permissions.');
        console.log('[DIA] Lead created:', state.leadId);

        /* 2. Fetch autonumber leadRef */
        setBusy(true, 'Fetching registration reference\u2026');
        var fetchedRef = await fetchLeadRef(state.leadId);
        state.leadRef = fetchedRef || null;
        console.log('[DIA] leadRef:', state.leadRef);
        saveSession();

        /* 3. Contact — non-blocking */
        setBusy(true, 'Creating contact record\u2026');
        try {
            var cr = await Promise.allSettled([dataversePost('contacts', buildContactPayload())]);
            if (cr[0].status === 'rejected') console.warn('[DIA] Contact failed (non-fatal):', cr[0].reason && cr[0].reason.message);
            else console.log('[DIA] Contact created:', cr[0].value && cr[0].value.id);
        } catch (e) { console.warn('[DIA] Contact error (non-fatal):', e.message); }

        /* 4. PaymentEvidence — critical */
        setBusy(true, 'Creating payment record\u2026');
        var evidence = await dataversePost('ongc_paymentevidences', buildPaymentEvidencePayload());
        if (evidence && evidence.id) {
            state.paymentEvidenceId = evidence.id;
            console.log('[DIA] Evidence created:', evidence.id);
        } else {
            console.warn('[DIA] Evidence GUID not returned — return page will create fallback record');
        }
        saveSession();
    }

    /* ════════════════════════════════════════════════════════════
       STRIPE REDIRECT (shared /agpal-stripe-checkout)
    ════════════════════════════════════════════════════════════ */
    function initiateStripePayment() {
        var fees = calcFees();
        var params = new URLSearchParams({
            leadId: state.leadId || '',
            leadRef: state.leadRef || '',
            paymentEvidenceId: state.paymentEvidenceId || '',
            amount: fees.total.toFixed(2),
            base: fees.base.toFixed(2),
            surcharge: fees.surcharge.toFixed(2),
            gst: fees.gst.toFixed(2),
            email: gVal('contactEmail'),
            name: (gVal('contactFirstName') + ' ' + gVal('contactLastName')).trim(),
            ref: 'QIP Diagnostic Imaging Registration \u2013 ' + gVal('practiceName'),
            returnUrl: window.location.href.split('?')[0]
        });
        try {
            sessionStorage.setItem(state.paymentInProgressKey, '1');
            if (state.leadId) sessionStorage.setItem(state.leadIdKey, state.leadId);
            if (state.leadRef) sessionStorage.setItem(state.leadRefKey, state.leadRef);
            if (state.paymentEvidenceId) sessionStorage.setItem(state.evidenceIdKey, state.paymentEvidenceId);
        } catch (e) { }
        /* location.replace so Back can't return to mid-payment form */
        window.location.replace('/agpal-stripe-checkout?' + params.toString());
    }

    /* ════════════════════════════════════════════════════════════
       SUBMIT ENTRY POINT
    ════════════════════════════════════════════════════════════ */
    async function diaSubmit() {
        /* Validate declarations */
        var auth = document.getElementById('authCheck') && document.getElementById('authCheck').checked;
        var tc = document.getElementById('termsCheck') && document.getElementById('termsCheck').checked;
        var confirm = document.getElementById('confirmCheck') && document.getElementById('confirmCheck').checked;
        var af = gVal('authFirstName');
        var al = gVal('authLastName');
        var sigOk = !isSigEmpty();
        var errEl = document.getElementById('diaSubmitError');

        document.getElementById('err_authCheck') && document.getElementById('err_authCheck').classList.toggle('visible', !auth);
        document.getElementById('err_termsCheck') && document.getElementById('err_termsCheck').classList.toggle('visible', !tc);
        document.getElementById('err_confirmCheck') && document.getElementById('err_confirmCheck').classList.toggle('visible', !confirm);
        document.getElementById('err_signature') && document.getElementById('err_signature').classList.toggle('visible', !sigOk);
        document.getElementById('err_authFirstName') && document.getElementById('err_authFirstName').classList.toggle('visible', !af);
        document.getElementById('err_authLastName') && document.getElementById('err_authLastName').classList.toggle('visible', !al);

        if (!auth || !tc || !confirm || !sigOk || !af || !al) {
            if (errEl) errEl.classList.add('visible');
            var first = document.querySelector('.dia-error-msg.visible');
            if (first) first.scrollIntoView({ behavior: 'smooth', block: 'center' });
            return;
        }
        if (errEl) errEl.classList.remove('visible');

        try {
            await createAllRecords();
            setBusy(true, 'Redirecting to payment\u2026');
            initiateStripePayment();
        } catch (err) {
            console.error('[DIA] Submit failed:', err);
            if (errEl) {
                errEl.classList.add('visible');
                errEl.textContent = 'Could not submit registration: ' + (err.message || 'Unknown error') + '. Please try again.';
                errEl.scrollIntoView({ behavior: 'smooth', block: 'center' });
            }
            setBusy(false);
        }
    }

    /* ════════════════════════════════════════════════════════════
       SAVE (placeholder) & TOAST
    ════════════════════════════════════════════════════════════ */
    function diaSave() { showToast('Progress saved.', 'success'); }

    function showToast(msg, type) {
        var el = document.getElementById('diaToast');
        if (!el) return;
        el.textContent = msg;
        el.className = 'dia-toast ' + (type || '') + ' show';
        setTimeout(function () { el.classList.remove('show'); }, 3000);
    }

    /* ════════════════════════════════════════════════════════════
       INIT
    ════════════════════════════════════════════════════════════ */
    document.addEventListener('DOMContentLoaded', function () {
        injectSpinner();
        clearSession();
        buildProgress();
        bindModalityCards();
        diaUpdateFee();
        ['standardsLevel', 'entryModalityCount', 'fullModalityCount'].forEach(function (id) {
            var el = document.getElementById(id);
            if (el) el.addEventListener('change', diaUpdateFee);
        });
    });

    window.addEventListener('resize', function () { if (state.sigCtx) initSig(); });

    /* ── Expose globals for inline onclick ── */
    window.diaNextPage = diaNextPage;
    window.diaPrevPage = diaPrevPage;
    window.diaSave = diaSave;
    window.diaSubmit = diaSubmit;
    window.diaClearSig = diaClearSig;
    window.diaUpdateFee = diaUpdateFee;
    window.diaCorporateChange = diaCorporateChange;
    window.diaPrevAccreditedChange = diaPrevAccreditedChange;
    window.diaSectorChange = diaSectorChange;
    window.diaPostalToggle = diaPostalToggle;
    window.diaStandardsChange = diaStandardsChange;

}());