(function () {
    'use strict';

    const importModal = new bootstrap.Modal(document.getElementById('importModal'));
    let currentLibraryItemId = null;

    // Open preview modal when any "Preview & Import" button is clicked
    document.getElementById('libraryGrid')?.addEventListener('click', function (e) {
        const btn = e.target.closest('.btn-import');
        if (!btn) return;

        currentLibraryItemId = parseInt(btn.dataset.itemId, 10);
        const itemName = btn.dataset.itemName;

        document.getElementById('importModalLabel').textContent = 'Import — ' + itemName;
        document.getElementById('importModalBody').innerHTML =
            '<div class="text-center py-4"><div class="spinner-border text-primary" role="status"></div>' +
            '<p class="mt-2 text-muted">Loading formula details…</p></div>';
        document.getElementById('btnConfirmImport').disabled = true;

        importModal.show();

        fetch('/FormulaLibrary/Detail/' + currentLibraryItemId)
            .then(r => r.json())
            .then(renderDetail)
            .catch(() => {
                document.getElementById('importModalBody').innerHTML =
                    '<div class="alert alert-danger">Failed to load formula details.</div>';
            });
    });

    function renderDetail(d) {
        let fields = [];
        try { fields = JSON.parse(d.fieldsJson || '[]'); } catch (_) { }

        const alreadyBadge = d.alreadyImported
            ? '<span class="badge bg-success ms-2"><i class="bi bi-check-lg me-1"></i>Already in your library</span>'
            : '';

        const inspiredRow = (d.inspiredByName)
            ? `<div class="alert alert-light border fst-italic small py-2 mb-3">
                   <i class="bi bi-diagram-2 me-1"></i>Inspired by
                   &ldquo;${escHtml(d.inspiredByName)}&rdquo; from ${escHtml(d.inspiredByCompanyName)}
               </div>`
            : '';

        const modeBadge = d.outputMode === 'FixedRate'
            ? '<span class="badge bg-primary">Fixed Rate</span>'
            : '<span class="badge bg-info">Surface Area (sq ft)</span>';

        const fieldRows = fields.map(f =>
            `<tr><td>${escHtml(f.label || f.name)}</td><td class="text-muted">${escHtml(f.unit || '')}</td><td>${escHtml(String(f.defaultValue ?? ''))}</td></tr>`
        ).join('');

        const diagramHtml = d.diagramImagePath
            ? `<div class="mb-3"><img src="/FormulaLibrary/Diagram?path=${encodeURIComponent(d.diagramImagePath)}" class="img-fluid rounded border" style="max-height:200px" alt="Formula diagram" /></div>`
            : '';

        document.getElementById('importModalBody').innerHTML = `
            <div class="row">
                <div class="col-md-6">
                    <p class="mb-1"><strong>${escHtml(d.name)}</strong>${alreadyBadge}</p>
                    <p class="text-muted small mb-2"><i class="bi bi-building me-1"></i>${escHtml(d.sourceCompanyName)}</p>
                    ${inspiredRow}
                    ${d.description ? `<p class="text-muted small mb-3">${escHtml(d.description)}</p>` : ''}
                    <div class="d-flex gap-2 mb-3">
                        ${modeBadge}
                        ${d.industryHint ? `<span class="badge bg-secondary">${escHtml(d.industryHint)}</span>` : ''}
                    </div>
                    ${d.defaultRate != null ? `<p class="small mb-1"><strong>Default rate:</strong> ${escHtml(String(d.defaultRate))} ${escHtml(d.rateLabel || '')}</p>` : ''}
                    ${d.notes ? `<p class="small text-muted">${escHtml(d.notes)}</p>` : ''}
                </div>
                <div class="col-md-6">
                    ${diagramHtml}
                    ${fields.length > 0 ? `
                    <h6 class="small fw-semibold mb-2">Input Fields (${fields.length})</h6>
                    <table class="table table-sm table-bordered">
                        <thead><tr><th>Field</th><th>Unit</th><th>Default</th></tr></thead>
                        <tbody>${fieldRows}</tbody>
                    </table>` : '<p class="text-muted small">No fields defined.</p>'}
                    <div class="mt-2">
                        <h6 class="small fw-semibold mb-1">Formula Expression</h6>
                        <code class="d-block bg-light border rounded p-2 small text-break">${escHtml(d.formula)}</code>
                    </div>
                </div>
            </div>`;

        const importBtn = document.getElementById('btnConfirmImport');
        if (d.alreadyImported) {
            importBtn.disabled = true;
            importBtn.innerHTML = '<i class="bi bi-check-lg me-1"></i>Already Imported';
            importBtn.classList.replace('btn-primary', 'btn-success');
        } else {
            importBtn.disabled = false;
        }
    }

    // Confirm import
    document.getElementById('btnConfirmImport')?.addEventListener('click', function () {
        if (!currentLibraryItemId) return;

        this.disabled = true;
        this.innerHTML = '<span class="spinner-border spinner-border-sm me-1"></span>Importing&hellip;';

        const form = new FormData();
        form.append('libraryItemId', currentLibraryItemId);
        form.append('__RequestVerificationToken', document.querySelector('input[name="__RequestVerificationToken"]')?.value ?? '');

        fetch('/FormulaLibrary/Import', { method: 'POST', body: form })
            .then(r => r.json())
            .then(res => {
                if (res.success) {
                    importModal.hide();
                    showToast('Formula imported to your library!', 'success');
                    // Mark button on the card
                    const card = document.querySelector(`.btn-import[data-item-id="${currentLibraryItemId}"]`);
                    if (card) {
                        card.classList.replace('btn-outline-primary', 'btn-outline-success');
                        card.innerHTML = '<i class="bi bi-check-lg me-1"></i><span>Already Imported</span>';
                        card.disabled = true;
                        card.closest('.card')?.classList.add('border-start', 'border-success', 'border-3');
                    }
                } else {
                    showToast(res.message || 'Import failed.', 'danger');
                    this.disabled = false;
                    this.innerHTML = '<i class="bi bi-cloud-download me-1"></i>Import to My Formulas';
                }
            })
            .catch(() => {
                showToast('Import failed. Please try again.', 'danger');
                this.disabled = false;
                this.innerHTML = '<i class="bi bi-cloud-download me-1"></i>Import to My Formulas';
            });
    });

    function escHtml(str) {
        return String(str)
            .replace(/&/g, '&amp;')
            .replace(/</g, '&lt;')
            .replace(/>/g, '&gt;')
            .replace(/"/g, '&quot;');
    }

    function showToast(msg, type) {
        const container = document.getElementById('toastContainer')
            || (() => {
                const c = document.createElement('div');
                c.id = 'toastContainer';
                c.className = 'toast-container position-fixed bottom-0 end-0 p-3';
                c.style.zIndex = '1100';
                document.body.appendChild(c);
                return c;
            })();

        const el = document.createElement('div');
        el.className = `toast align-items-center text-white bg-${type} border-0`;
        el.setAttribute('role', 'alert');
        el.innerHTML = `<div class="d-flex"><div class="toast-body">${escHtml(msg)}</div>
            <button type="button" class="btn-close btn-close-white me-2 m-auto" data-bs-dismiss="toast"></button></div>`;
        container.appendChild(el);
        new bootstrap.Toast(el, { delay: 4000 }).show();
        el.addEventListener('hidden.bs.toast', () => el.remove());
    }
})();