{% extends "base.html" %}

{% block content %}
<div class="dashboard-container dashboard-stack">

  <div class="detail-header">
    <div class="detail-crumbs">
      <a href="/">Dashboard</a> ›
      <a href="/configs">Configs</a> ›
      <span class="muted">{{ title }}</span>
    </div>
    <h1>{{ title }}</h1>
  </div>

  {# ── Toast notification ───────────────────────────────── #}
  <div id="toast" class="editor-toast" role="status" aria-live="polite"></div>

  <form id="config-form" novalidate>

    {# ── Top meta strip ───────────────────────────────────── #}
    <div class="editor-meta-strip">

      <div class="editor-field editor-field-wide">
        <label for="f-reference">Reference <span class="req">*</span></label>
        <input id="f-reference" name="reference" type="text" placeholder="e.g. fx-settlement"
          {% if not is_new %}readonly{% endif %}
          value="{{ reference if not is_new else '' }}">
        <span class="field-hint">Unique identifier — lowercase, hyphen-separated.</span>
      </div>

      <div class="editor-field editor-field-wide">
        <label for="f-name">Display Name <span class="req">*</span></label>
        <input id="f-name" name="name" type="text" placeholder="e.g. FX Settlement Recon">
      </div>

      <div class="editor-field">
        <label for="f-business-process">Business Process</label>
        <input id="f-business-process" name="business_process" type="text" placeholder="e.g. Treasury">
      </div>

      <div class="editor-field">
        <label for="f-data-type">Data Type</label>
        <input id="f-data-type" name="data_type" type="text" placeholder="e.g. Transaction">
      </div>

      <div class="editor-field">
        <label for="f-pattern">Pattern <span class="req">*</span></label>
        <select id="f-pattern" name="pattern">
          {% for p in patterns %}
          <option value="{{ p }}">{{ p | replace('_', ' ') | title }}</option>
          {% endfor %}
        </select>
      </div>

      <div class="editor-field">
        <label for="f-status">Status <span class="req">*</span></label>
        <select id="f-status" name="status">
          {% for s in statuses %}
          <option value="{{ s }}">{{ s | title }}</option>
          {% endfor %}
        </select>
        <span class="field-hint">Draft results go to staging tables; Published go to live dashboards.</span>
      </div>

      <div class="editor-field">
        <label for="f-frequency">Frequency</label>
        <select id="f-frequency" name="frequency">
          {% for f in frequencies %}
          <option value="{{ f }}">{{ f }}</option>
          {% endfor %}
        </select>
      </div>

      <div class="editor-field">
        <label for="f-start-datetime">Schedule Start</label>
        <input id="f-start-datetime" name="start_datetime" type="datetime-local">
      </div>

      <div class="editor-field editor-field-full">
        <label for="f-comment">Notes</label>
        <textarea id="f-comment" name="comment" rows="2" placeholder="Optional — visible to your team."></textarea>
      </div>

    </div>{# /meta-strip #}

    {# ── Two-column editor body ────────────────────────────── #}
    <div class="editor-body">

      {# ── Sources column ────────────────────────────────── #}
      <section class="editor-section">
        <div class="editor-section-header">
          <h2>Sources</h2>
          <button type="button" class="btn btn-secondary btn-sm" id="btn-add-source">+ Add Source</button>
        </div>
        <div id="sources-container"></div>
      </section>

      {# ── Destination column ────────────────────────────── #}
      <section class="editor-section">
        <div class="editor-section-header">
          <h2>Destination</h2>
        </div>
        <div id="destination-container"></div>
      </section>

    </div>{# /editor-body #}

    {# ── Field mapping ─────────────────────────────────────── #}
    <section class="editor-full-section">
      <div class="editor-section-header">
        <h2>Field Mapping</h2>
        <button type="button" class="btn btn-secondary btn-sm" id="btn-add-mapping">+ Add Mapping</button>
      </div>
      <p class="field-hint" style="margin-bottom:10px">Map source column names to destination column names when they differ. Leave empty if all column names already match.</p>
      <div id="field-mapping-container">
        <div class="mapping-row mapping-header">
          <span>Source Column</span>
          <span></span>
          <span>Destination Column</span>
          <span></span>
        </div>
      </div>
    </section>

    {# ── Action bar ─────────────────────────────────────────── #}
    <div class="editor-actions">
      <a href="/configs" class="btn btn-secondary">Cancel</a>
      <button type="button" class="btn btn-secondary" id="btn-preview-json">Preview JSON</button>
      <button type="submit" class="btn btn-primary" id="btn-submit">
        {{ 'Create Config' if is_new else 'Save Changes' }}
      </button>
    </div>

  </form>

  {# ── JSON preview panel (hidden by default) ───────────── #}
  <div id="json-preview-panel" class="editor-json-panel" hidden>
    <div class="editor-section-header">
      <h2>JSON Preview</h2>
      <button type="button" class="btn btn-secondary btn-sm" id="btn-close-json">Close</button>
    </div>
    <pre id="json-preview-content" class="editor-json-pre"></pre>
  </div>

</div>

{# ── System Config Card Template ──────────────────────────────────────────── #}
<template id="tpl-syscfg">
  <div class="syscfg-card" data-syscfg-index="">
    <div class="syscfg-card-header">
      <span class="syscfg-card-title">System</span>
      <div class="syscfg-card-actions">
        <button type="button" class="btn btn-secondary btn-sm btn-remove-syscfg">Remove</button>
      </div>
    </div>

    <div class="syscfg-grid">

      <div class="editor-field editor-field-wide">
        <label>Name</label>
        <input type="text" data-field="name" placeholder="e.g. Core Banking">
      </div>

      <div class="editor-field">
        <label>Day Offset</label>
        <input type="number" data-field="day_offset" value="0" min="-365" max="365">
        <span class="field-hint">Days ± relative to the job as-at date.</span>
      </div>

      <div class="editor-field editor-field-wide">
        <label>Filter</label>
        <input type="text" data-field="filter" placeholder="e.g. status = 'ACTIVE'">
        <span class="field-hint">Appended to WHERE clause (SQL) or used as a pandas .query() expression (file).</span>
      </div>

      <div class="editor-field editor-field-full">
        <label>URL <span class="req">*</span></label>
        <div class="url-input-row">
          <input type="text" data-field="url" placeholder="file:// or mssql:// or oracle:// ..." class="url-input">
          <button type="button" class="btn btn-secondary btn-sm btn-test-url">Try URL</button>
        </div>
        <span class="field-hint">
          Supports: <code>file://</code> <code>mssql://</code> <code>oracle://</code> <code>snowflake://</code> <code>duckdb://</code><br>
          Date templates: {% raw %}<code>{{as_at_date.strftime('%Y%m%d')}}</code> <code>{{today.strftime('%Y%m%d')}}</code>{% endraw %}
        </span>
        <div class="url-test-result" hidden></div>
      </div>

      <div class="editor-field editor-field-full">
        <label>SQL Override</label>
        <textarea data-field="sql" rows="2" placeholder="Full SQL query — replaces auto-generated SELECT. Required for duckdb://."></textarea>
      </div>

      <div class="editor-field editor-field-wide">
        <label>Comment</label>
        <input type="text" data-field="comment" placeholder="Optional note about this system.">
      </div>

    </div>{# /syscfg-grid #}

    {# Schema builder #}
    <details class="syscfg-section">
      <summary>Schema <span class="syscfg-section-count schema-count">0 columns</span></summary>
      <div class="schema-builder">
        <div class="kv-table-header">
          <span>Column Name</span><span>Type</span><span></span>
        </div>
        <div class="schema-rows"></div>
        <button type="button" class="btn btn-secondary btn-sm btn-add-schema-row">+ Add Column</button>
      </div>
    </details>

    {# CSV Spec #}
    <details class="syscfg-section syscfg-csv-spec" hidden>
      <summary>CSV Options</summary>
      <div class="syscfg-grid">
        <div class="editor-field">
          <label>Delimiter</label>
          <input type="text" data-spec="csv" data-field="delimiter" value="," maxlength="3" style="max-width:60px">
        </div>
        <div class="editor-field">
          <label>Encoding</label>
          <input type="text" data-spec="csv" data-field="encoding" value="utf_8" style="max-width:120px">
        </div>
        <div class="editor-field">
          <label>Trailer Rows</label>
          <input type="number" data-spec="csv" data-field="trailer_rows" value="0" min="0" style="max-width:80px">
        </div>
        <div class="editor-field">
          <label>Has Header</label>
          <label class="toggle-label">
            <input type="checkbox" data-spec="csv" data-field="header" checked>
            <span class="toggle-track"></span>
          </label>
        </div>
        <div class="editor-field">
          <label>Quoting</label>
          <label class="toggle-label">
            <input type="checkbox" data-spec="csv" data-field="quoting" checked>
            <span class="toggle-track"></span>
          </label>
        </div>
      </div>
    </details>

    {# XML Spec #}
    <details class="syscfg-section syscfg-xml-spec" hidden>
      <summary>XML Options</summary>
      <div class="syscfg-grid">
        <div class="editor-field editor-field-wide">
          <label>XPath</label>
          <input type="text" data-spec="xml" data-field="xpathstr" value="./*">
        </div>
        <div class="editor-field">
          <label>Encoding</label>
          <input type="text" data-spec="xml" data-field="encoding" value="utf-8">
        </div>
      </div>
    </details>

    {# Advanced fields #}
    <details class="syscfg-section">
      <summary>Advanced</summary>
      <div class="syscfg-grid">
        <div class="editor-field editor-field-full">
          <label>Index Fields</label>
          <input type="text" data-field="index_fields" placeholder="Comma-separated field names used as join keys.">
        </div>
        <div class="editor-field editor-field-full">
          <label>Obfuscate Fields</label>
          <input type="text" data-field="obfuscate_fields" placeholder="Comma-separated — values shown as *** in reports.">
        </div>
        <div class="editor-field editor-field-full">
          <label>PCI Redact Fields</label>
          <input type="text" data-field="pci_redact_fields" placeholder="Comma-separated — completely stripped from output.">
        </div>
        <div class="editor-field editor-field-full">
          <label>Fixed Width Column Widths</label>
          <input type="text" data-field="field_widths" placeholder="Comma-separated integers, e.g. 10,20,5">
          <span class="field-hint">Only needed for fixed-width files (not delimited).</span>
        </div>
      </div>
    </details>

  </div>{# /syscfg-card #}
</template>

<script>
// ── Schema type options ─────────────────────────────────────────────────────
const SCHEMA_TYPES = {{ schema_types | tojson }};
const IS_NEW = {{ 'true' if is_new else 'false' }};
const CONFIG_REF = {{ (reference | tojson) if not is_new else 'null' }};

// ── Build a syscfg card from a data object ──────────────────────────────────
function buildSyscfgCard(data, role, index) {
  const tpl = document.getElementById('tpl-syscfg');
  const card = tpl.content.cloneNode(true).querySelector('.syscfg-card');
  card.dataset.syscfgIndex = index;
  card.dataset.role = role; // 'source' | 'destination'

  const titleEl = card.querySelector('.syscfg-card-title');
  titleEl.textContent = role === 'destination' ? 'Destination' : `Source ${index + 1}`;

  // Remove button (hide for destination)
  const removeBtn = card.querySelector('.btn-remove-syscfg');
  if (role === 'destination') {
    removeBtn.remove();
  } else {
    removeBtn.addEventListener('click', () => {
      card.remove();
      reindexSources();
    });
  }

  // Populate simple fields
  const fields = ['name','url','day_offset','filter','sql','comment'];
  fields.forEach(f => {
    const el = card.querySelector(`[data-field="${f}"]`);
    if (!el) return;
    const val = data[f];
    if (val !== undefined && val !== null) el.value = val;
  });

  // Populate list fields (comma-joined)
  ['index_fields','obfuscate_fields','pci_redact_fields'].forEach(f => {
    const el = card.querySelector(`[data-field="${f}"]`);
    if (el && Array.isArray(data[f])) el.value = data[f].join(', ');
  });
  const fwEl = card.querySelector('[data-field="field_widths"]');
  if (fwEl && Array.isArray(data.field_widths)) fwEl.value = data.field_widths.join(', ');

  // Schema
  const schemaData = data.system_schema || {};
  Object.entries(schemaData).forEach(([col, type]) => addSchemaRow(card, col, type));
  updateSchemaCount(card);

  // CSV spec
  if (data.csv_spec) {
    card.querySelector('.syscfg-csv-spec').removeAttribute('hidden');
    const cs = data.csv_spec;
    setSpecField(card, 'csv', 'delimiter', cs.delimiter ?? ',');
    setSpecField(card, 'csv', 'encoding', cs.encoding ?? 'utf_8');
    setSpecField(card, 'csv', 'trailer_rows', cs.trailer_rows ?? 0);
    setSpecCheckbox(card, 'csv', 'header', cs.header !== false);
    setSpecCheckbox(card, 'csv', 'quoting', cs.quoting !== false);
  }

  // XML spec
  if (data.xml_spec) {
    card.querySelector('.syscfg-xml-spec').removeAttribute('hidden');
    setSpecField(card, 'xml', 'xpathstr', data.xml_spec.xpathstr ?? './*');
    setSpecField(card, 'xml', 'encoding', data.xml_spec.encoding ?? 'utf-8');
  }

  // URL change → show/hide specs, clear test result
  const urlInput = card.querySelector('.url-input');
  urlInput.addEventListener('input', () => {
    syncSpecVisibility(card);
    card.querySelector('.url-test-result').setAttribute('hidden', '');
  });
  syncSpecVisibility(card);

  // Schema add button
  card.querySelector('.btn-add-schema-row').addEventListener('click', () => {
    addSchemaRow(card);
    updateSchemaCount(card);
  });

  // Try URL button
  card.querySelector('.btn-test-url').addEventListener('click', () => testUrl(card));

  return card;
}

function setSpecField(card, spec, field, value) {
  const el = card.querySelector(`[data-spec="${spec}"][data-field="${field}"]`);
  if (el) el.value = value;
}
function setSpecCheckbox(card, spec, field, checked) {
  const el = card.querySelector(`[data-spec="${spec}"][data-field="${field}"]`);
  if (el) el.checked = checked;
}

function syncSpecVisibility(card) {
  const url = (card.querySelector('.url-input').value || '').toLowerCase();
  const isFile = url.startsWith('file://');
  const isXml = isFile && /\.xml(\b|$|\?|#)/.test(url);
  const isCsv = isFile && !isXml;
  card.querySelector('.syscfg-csv-spec').toggleAttribute('hidden', !isCsv);
  card.querySelector('.syscfg-xml-spec').toggleAttribute('hidden', !isXml);
}

function addSchemaRow(card, colName, colType) {
  const container = card.querySelector('.schema-rows');
  const row = document.createElement('div');
  row.className = 'schema-row';

  const colInput = document.createElement('input');
  colInput.type = 'text';
  colInput.placeholder = 'column_name';
  colInput.value = colName || '';
  colInput.addEventListener('input', () => updateSchemaCount(card));

  const typeSelect = document.createElement('select');
  SCHEMA_TYPES.forEach(t => {
    const opt = document.createElement('option');
    opt.value = t; opt.textContent = t;
    if (t === (colType || 'str')) opt.selected = true;
    typeSelect.appendChild(opt);
  });

  const removeBtn = document.createElement('button');
  removeBtn.type = 'button';
  removeBtn.className = 'btn btn-secondary btn-sm';
  removeBtn.textContent = '×';
  removeBtn.addEventListener('click', () => { row.remove(); updateSchemaCount(card); });

  row.append(colInput, typeSelect, removeBtn);
  container.appendChild(row);
}

function updateSchemaCount(card) {
  const rows = card.querySelectorAll('.schema-rows .schema-row');
  const el = card.querySelector('.schema-count');
  el.textContent = `${rows.length} column${rows.length !== 1 ? 's' : ''}`;
}

// ── Re-index source card titles after removal ───────────────────────────────
function reindexSources() {
  document.querySelectorAll('#sources-container .syscfg-card').forEach((card, i) => {
    card.querySelector('.syscfg-card-title').textContent = `Source ${i + 1}`;
    card.dataset.syscfgIndex = i;
  });
}

// ── Read a syscfg card into a data object ───────────────────────────────────
function readSyscfgCard(card) {
  const g = (field) => {
    const el = card.querySelector(`[data-field="${field}"]`);
    return el ? (el.tagName === 'TEXTAREA' ? el.value : el.value) : '';
  };
  const toList = (val) => val.split(',').map(s => s.trim()).filter(Boolean);
  const toIntList = (val) => val.split(',').map(s => parseInt(s.trim(), 10)).filter(n => !isNaN(n));

  const url = g('url');
  const urlLower = url.toLowerCase();
  const isFile = urlLower.startsWith('file://');
  const isXml = isFile && /\.xml(\b|$)/.test(urlLower);

  const schema = {};
  card.querySelectorAll('.schema-rows .schema-row').forEach(row => {
    const name = row.querySelector('input').value.trim();
    const type = row.querySelector('select').value;
    if (name) schema[name] = type;
  });

  const spec = (specName, fields) => {
    const obj = {};
    let hasSpec = false;
    fields.forEach(({ field, isCheck }) => {
      const el = card.querySelector(`[data-spec="${specName}"][data-field="${field}"]`);
      if (!el) return;
      hasSpec = true;
      obj[field] = isCheck ? el.checked : (el.type === 'number' ? Number(el.value) : el.value);
    });
    return hasSpec ? obj : null;
  };

  const csvSpec = isFile && !isXml ? spec('csv', [
    { field: 'delimiter' },
    { field: 'encoding' },
    { field: 'trailer_rows', isCheck: false },
    { field: 'header', isCheck: true },
    { field: 'quoting', isCheck: true },
  ]) : null;
  const xmlSpec = isXml ? spec('xml', [{ field: 'xpathstr' }, { field: 'encoding' }]) : null;

  return {
    name: g('name'),
    url,
    comment: g('comment'),
    day_offset: parseInt(g('day_offset') || '0', 10),
    system_schema: schema,
    filter: g('filter'),
    sql: g('sql'),
    index_fields: toList(g('index_fields')),
    obfuscate_fields: toList(g('obfuscate_fields')),
    pci_redact_fields: toList(g('pci_redact_fields')),
    field_widths: toIntList(g('field_widths')),
    profile_thresholds: [],
    csv_spec: csvSpec,
    xml_spec: xmlSpec,
  };
}

// ── Field mapping ───────────────────────────────────────────────────────────
function addMappingRow(srcVal, dstVal) {
  const container = document.getElementById('field-mapping-container');
  const row = document.createElement('div');
  row.className = 'mapping-row';

  const srcInput = document.createElement('input');
  srcInput.type = 'text'; srcInput.placeholder = 'source_column'; srcInput.value = srcVal || '';

  const arrow = document.createElement('span');
  arrow.className = 'mapping-arrow'; arrow.textContent = '→';

  const dstInput = document.createElement('input');
  dstInput.type = 'text'; dstInput.placeholder = 'destination_column'; dstInput.value = dstVal || '';

  const removeBtn = document.createElement('button');
  removeBtn.type = 'button'; removeBtn.className = 'btn btn-secondary btn-sm';
  removeBtn.textContent = '×';
  removeBtn.addEventListener('click', () => row.remove());

  row.append(srcInput, arrow, dstInput, removeBtn);
  container.appendChild(row);
}

function readFieldMapping() {
  const mapping = {};
  document.querySelectorAll('#field-mapping-container .mapping-row').forEach(row => {
    const inputs = row.querySelectorAll('input');
    const src = inputs[0]?.value.trim();
    const dst = inputs[1]?.value.trim();
    if (src && dst) mapping[src] = dst;
  });
  return mapping;
}

// ── Collect full form payload ───────────────────────────────────────────────
function collectPayload() {
  const g = (id) => document.getElementById(id)?.value || '';
  const sources = Array.from(
    document.querySelectorAll('#sources-container .syscfg-card')
  ).map(card => readSyscfgCard(card));

  const destCards = document.querySelectorAll('#destination-container .syscfg-card');
  const destination = destCards.length > 0 ? readSyscfgCard(destCards[0]) : {};

  return {
    reference: g('f-reference'),
    name: g('f-name'),
    business_process: g('f-business-process'),
    data_type: g('f-data-type'),
    comment: g('f-comment'),
    pattern: g('f-pattern'),
    status: g('f-status'),
    frequency: g('f-frequency'),
    start_datetime: g('f-start-datetime') || null,
    sources,
    destination,
    field_mapping: readFieldMapping(),
  };
}

// ── Try URL ─────────────────────────────────────────────────────────────────
async function testUrl(card) {
  const url = card.querySelector('.url-input').value.trim();
  const resultEl = card.querySelector('.url-test-result');
  if (!url) { showToast('Enter a URL first.', 'warn'); return; }
  const btn = card.querySelector('.btn-test-url');
  btn.disabled = true; btn.textContent = 'Checking…';
  resultEl.removeAttribute('hidden');
  resultEl.className = 'url-test-result url-test-loading';
  resultEl.textContent = 'Checking URL…';
  try {
    const resp = await fetch('/api/configs/test-url', {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ url }),
    });
    const data = await resp.json();
    renderUrlTestResult(resultEl, data);
  } catch (err) {
    resultEl.className = 'url-test-result url-test-error';
    resultEl.textContent = `Error: ${err.message}`;
  } finally {
    btn.disabled = false; btn.textContent = 'Try URL';
  }
}

function renderUrlTestResult(el, data) {
  if (data.type === 'non-file') {
    el.className = 'url-test-result url-test-info';
    el.textContent = data.message;
    return;
  }
  if (!data.found) {
    el.className = 'url-test-result url-test-error';
    el.textContent = `Not found: ${data.message || data.resolved}`;
    return;
  }
  el.className = 'url-test-result url-test-ok';
  const lines = [`✓ ${data.matches} file${data.matches !== 1 ? 's' : ''} matched`];
  (data.files || []).forEach(f => {
    if (f.error) { lines.push(`  ⚠ ${f.path}: ${f.error}`); return; }
    const kb = (f.size_bytes / 1024).toFixed(1);
    lines.push(`  ${f.path.split('/').pop()}  ${kb} KB  (modified ${f.modified})`);
  });
  el.textContent = lines.join('\n');
}

// ── Toast ───────────────────────────────────────────────────────────────────
function showToast(msg, type = 'ok') {
  const el = document.getElementById('toast');
  el.textContent = msg;
  el.className = `editor-toast editor-toast-${type} editor-toast-visible`;
  clearTimeout(el._timer);
  el._timer = setTimeout(() => el.classList.remove('editor-toast-visible'), 3500);
}

// ── Form submit ─────────────────────────────────────────────────────────────
document.getElementById('config-form').addEventListener('submit', async (e) => {
  e.preventDefault();
  const payload = collectPayload();
  if (!payload.reference) { showToast('Reference is required.', 'error'); return; }
  if (!payload.name) { showToast('Display name is required.', 'error'); return; }
  if (payload.sources.length === 0) { showToast('At least one source is required.', 'error'); return; }

  const btn = document.getElementById('btn-submit');
  btn.disabled = true;
  const url = IS_NEW ? '/api/configs/' : `/api/configs/${CONFIG_REF}`;
  const method = IS_NEW ? 'POST' : 'PUT';
  try {
    const resp = await fetch(url, {
      method,
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify(payload),
    });
    if (resp.ok) {
      showToast(IS_NEW ? 'Config created!' : 'Config saved!', 'ok');
      setTimeout(() => { window.location.href = '/configs'; }, 1200);
    } else {
      const err = await resp.json().catch(() => ({ detail: resp.statusText }));
      showToast(`Error ${resp.status}: ${err.detail || JSON.stringify(err)}`, 'error');
    }
  } catch (err) {
    showToast(`Network error: ${err.message}`, 'error');
  } finally {
    btn.disabled = false;
  }
});

// ── JSON preview ────────────────────────────────────────────────────────────
document.getElementById('btn-preview-json').addEventListener('click', () => {
  const panel = document.getElementById('json-preview-panel');
  document.getElementById('json-preview-content').textContent =
    JSON.stringify(collectPayload(), null, 2);
  panel.removeAttribute('hidden');
  panel.scrollIntoView({ behavior: 'smooth', block: 'start' });
});
document.getElementById('btn-close-json').addEventListener('click', () => {
  document.getElementById('json-preview-panel').setAttribute('hidden', '');
});

// ── Add source ──────────────────────────────────────────────────────────────
document.getElementById('btn-add-source').addEventListener('click', () => {
  const container = document.getElementById('sources-container');
  const idx = container.querySelectorAll('.syscfg-card').length;
  container.appendChild(buildSyscfgCard({}, 'source', idx));
});

// ── Add mapping row ─────────────────────────────────────────────────────────
document.getElementById('btn-add-mapping').addEventListener('click', () => addMappingRow());

// ── Initialise from server data or blank ────────────────────────────────────
(async function init() {
  let data = null;
  if (!IS_NEW && CONFIG_REF) {
    try {
      const resp = await fetch(`/api/configs/${CONFIG_REF}`);
      if (resp.ok) data = await resp.json();
    } catch (_) {}
  }

  if (data) {
    // Populate top meta fields
    const setField = (id, val) => {
      const el = document.getElementById(id);
      if (!el || val === null || val === undefined) return;
      el.value = val;
    };
    setField('f-reference', data.reference);
    setField('f-name', data.name);
    setField('f-business-process', data.business_process);
    setField('f-data-type', data.data_type);
    setField('f-comment', data.comment || '');
    setField('f-pattern', data.pattern);
    setField('f-status', data.status);
    setField('f-frequency', data.frequency);
    if (data.start_datetime) {
      // datetime-local needs "YYYY-MM-DDTHH:MM"
      setField('f-start-datetime', data.start_datetime.slice(0, 16));
    }

    // Sources
    const srcContainer = document.getElementById('sources-container');
    (data.sources || []).forEach((s, i) => {
      srcContainer.appendChild(buildSyscfgCard(s, 'source', i));
    });

    // Destination
    const dstContainer = document.getElementById('destination-container');
    if (data.destination) {
      dstContainer.appendChild(buildSyscfgCard(data.destination, 'destination', 0));
    }

    // Field mapping
    Object.entries(data.field_mapping || {}).forEach(([src, dst]) => addMappingRow(src, dst));

  } else {
    // Blank form: one default source + destination
    document.getElementById('sources-container')
      .appendChild(buildSyscfgCard({}, 'source', 0));
    document.getElementById('destination-container')
      .appendChild(buildSyscfgCard({}, 'destination', 0));
  }
})();
</script>
{% endblock %}