1 files changed, 102 insertions, 0 deletions
diff --git a/src/modules/scenario.js b/src/modules/scenario.js
new file mode 100644
index 0000000..2483bc2
--- /dev/null
+++ b/src/modules/scenario.js
@@ -0,0 +1,102 @@
+async function loadScript(scenario, svg) {
+  return new Promise((resolve, reject) => {
+    const scriptEl = document.createElementNS("http://www.w3.org/2000/svg", 'script');
+
+    scriptEl.onload = () => {
+      console.log('map.js loaded');
+      resolve();
+    };
+
+    scriptEl.onerror = () => {
+      reject(Error('Script failed to load.'));
+    };
+
+    const dataset = scenario.querySelector('script').dataset;
+
+    if ('cols' in dataset && 'rows' in dataset) {
+      scriptEl.dataset.rows = dataset.rows;
+      scriptEl.dataset.cols = dataset.cols;
+    }
+
+    scriptEl.setAttributeNS(null, 'href', '../../map.js');
+    svg.append(scriptEl);
+  });
+}
+
+export async function requestResource(url) {
+  return new Promise((resolve, reject) => {
+    const request = new XMLHttpRequest();
+    request.open('GET', url, true);
+    request.responseType = 'document';
+
+    request.onload = function() {
+      if (request.status === 200) {
+        resolve(request.response);
+      } else {
+        reject(Error('Image didn\'t load successfully; error code:' + request.statusText));
+      }
+    };
+
+    request.onerror = function() {
+      reject(Error('There was a network error.'));
+    };
+
+    request.send();
+  });
+}
+
+export async function build(svg, request) {
+  const gb = svg.querySelector('.gameboard');
+  const grid = svg.querySelector('.grid');
+
+  const scenario = await request;
+  const startLocs = scenario.querySelector('.start-locations');
+  const externalResourceEls = Array.from(scenario.querySelectorAll('use[href*=".svg"'));
+
+  const refs = externalResourceEls.reduce((acc, el) => {
+    const href = el.getAttributeNS(null, 'href');
+    const [filename] = href.match(/.+\.svg/);
+    const fragmentIdentifier = href.split('.svg').pop();
+
+    (acc[filename] ??= new Set()).add(fragmentIdentifier);
+    el.setAttributeNS(null, 'href', fragmentIdentifier);
+
+    return acc;
+  }, {});
+
+  await Promise.all(
+    Object.keys(refs).map(filename => requestResource(`assets/images/${filename}`))
+  ).then(result => {
+    const defs = svg.querySelector('defs');
+
+    Object.keys(refs).forEach((filename, index) => {
+      const external = result[index];
+
+      refs[filename].forEach(fragmentIdentifier => {
+        external
+          .querySelectorAll(`${fragmentIdentifier} use`)
+          .forEach(el => refs[filename].add(el.getAttributeNS(null, 'href')));
+      });
+
+      const refsQuery = [...refs[filename]].join(', ');
+
+      external.querySelectorAll(refsQuery).forEach(node =>
+        defs.append(svg.ownerDocument.importNode(node, true))
+      );
+    });
+  });
+
+  scenario.querySelectorAll('use.mapsheet').forEach(el =>
+    gb.querySelector('#background').after(svg.ownerDocument.importNode(el, true))
+  );
+
+  if (startLocs) grid.before(svg.ownerDocument.importNode(startLocs, true));
+
+  const scenarioGrid = scenario.querySelector('.grid');
+
+  if (scenarioGrid) {
+    grid.replaceWith(svg.ownerDocument.importNode(scenarioGrid, true));
+  }
+
+  return loadScript(scenario, svg);
+}