{% extends "app/templates/base.tmpl" %}

{% block title %}
Graph Console
{% endblock %}

{% block content %}
<nav>
  <div class="title">
    <h1>GRAPH CONSOLE (VERSION: {{version}})</h1>
  </div>
</nav>
<main class="dashboard">
  <section class="widget">
    <p><a href="/dbg">&larr; Back to debug</a></p>

    <fieldset>
      <legend>Load graph in memory</legend>
      <desc>
        Projects the Penpot file into an in-memory Ladybug database for this
        admin session. Loading a new file replaces the previous one.
      </desc>
      <form method="post" action="/dbg/actions/graph-load">
        <div class="row">
          <input type="text" style="width:420px" name="file-id"
                 placeholder="file-id"
                 value="{% if session %}{{session.file-id}}{% endif %}" />
        </div>
        <div class="row">                 
          <input type="submit" value="Load" />
        </div>
      </form>
      {% if session %}
      <form method="post" action="/dbg/actions/graph-unload">
        <div class="row">
          <input type="submit" value="Unload" />
        </div>
      </form>
      {% endif %}
    </fieldset>

    {% if session %}
    <fieldset>
      <legend>Loaded session</legend>
      <desc>
        <p>
          File: <b>{{session.name}}</b> ({{session.file-id}})<br />
          Loaded at revision: <b>{{session.revn}}</b><br />
          Graph revision: <b id="graph-sync-revn">{% if session.graph-revn %}{{session.graph-revn}}{% else %}{{session.revn}}{% endif %}</b><br />
          Schema: <b>{{session.schema-version}}</b><br />
          Loaded at: <b>{{session.loaded-at}}</b>
        </p>
        <p id="graph-sync-status">
          Feed: <b id="graph-ws-status">connecting…</b>
          <span id="graph-sync-error" style="display:none; margin-left: 1em; color: #b91c1c;"></span>
        </p>
        <form id="graph-reload-form" method="post" action="/dbg/actions/graph-reload">
          <input type="submit" value="Full reload (fallback)" />
        </form>
        {% if session.projection.stats %}
        <p>
          Projection:
          documents={{session.projection.stats.documents}},
          pages={{session.projection.stats.pages}},
          shapes={{session.projection.stats.shapes}}
        </p>
        {% endif %}
      </desc>
    </fieldset>

    <fieldset>
      <legend>File changes (live)</legend>
      <desc>
        Subscribes to the workspace WebSocket feed for visibility. The backend
        applies supported changes incrementally to the in-memory Ladybug graph
        via msgbus (<code>:file-change</code>).
      </desc>
      <div id="graph-changelog-empty" style="color: #666;">Waiting for changes…</div>
      <table id="graph-changelog" border="1" cellpadding="4" cellspacing="0"
             style="border-collapse: collapse; width: 100%; display: none;">
        <thead>
          <tr>
            <th>revn</th>
            <th>changes</th>
          </tr>
        </thead>
        <tbody id="graph-changelog-body"></tbody>
      </table>
    </fieldset>

    <fieldset>
      <legend>Cypher query</legend>
      <form id="graph-query-form" method="post" action="/dbg/actions/graph-query">
        <div class="row">
          <textarea name="query" rows="8" style="width:100%; font-family: monospace;">{{query}}</textarea>
        </div>
        <div class="row">
          <input type="submit" value="Run query" />
        </div>
      </form>
    </fieldset>

    <div id="graph-query-output">
      {% if error %}
      <fieldset>
        <legend>Error</legend>
        <pre>{{error}}</pre>
      </fieldset>
      {% endif %}

      {% if query-result %}
      <fieldset>
        <legend>Results ({{query-result.row-count}} rows{% if query-result.truncated? %}, truncated{% endif %})</legend>
        <table border="1" cellpadding="4" cellspacing="0" style="border-collapse: collapse; width: 100%;">
          <thead>
            <tr>
              {% for column in query-result.columns %}
              <th>{{column}}</th>
              {% endfor %}
            </tr>
          </thead>
          <tbody>
            {% for row in query-result.rows %}
            <tr>
              {% for cell in row %}
              <td><code>{{cell}}</code></td>
              {% endfor %}
            </tr>
            {% endfor %}
          </tbody>
        </table>
      </fieldset>
      {% endif %}
    </div>
    {% endif %}
  </section>
</main>

{% if session %}
<script>
(function () {
  const fileId = "{{session.file-id}}";
  const sessionId = crypto.randomUUID();
  const wsScheme = location.protocol === "https:" ? "wss:" : "ws:";
  const wsUrl = wsScheme + "//" + location.host
    + "/ws/notifications?session-id=" + sessionId;

  const wsStatus = document.getElementById("graph-ws-status");
  const syncRevnEl = document.getElementById("graph-sync-revn");
  const syncErrorEl = document.getElementById("graph-sync-error");
  const changelog = document.getElementById("graph-changelog");
  const changelogBody = document.getElementById("graph-changelog-body");
  const changelogEmpty = document.getElementById("graph-changelog-empty");

  let ws = null;

  function encodeTransitUuid(uuid) {
    return "~u" + uuid;
  }

  function encodeSubscribe(fileId) {
    return JSON.stringify({
      "~:type": "~:subscribe-file",
      "~:file-id": encodeTransitUuid(fileId)
    });
  }

  function encodeUnsubscribe(fileId) {
    return JSON.stringify({
      "~:type": "~:unsubscribe-file",
      "~:file-id": encodeTransitUuid(fileId)
    });
  }

  function parseTransitValue(value) {
    if (typeof value === "string") {
      if (value.startsWith("~:")) return value.slice(2);
      if (value.startsWith("~u")) return value.slice(2);
    }
    if (Array.isArray(value)) return value.map(parseTransitValue);
    if (value && typeof value === "object") return parseTransitMap(value);
    return value;
  }

  function parseTransitMap(obj) {
    const out = {};
    for (const [key, value] of Object.entries(obj)) {
      const name = key.startsWith("~:") ? key.slice(2) : key;
      out[name] = parseTransitValue(value);
    }
    return out;
  }

  function summarizeChange(change) {
    const parts = [change.type];
    if (change.id) parts.push("id=" + change.id);
    if (change.obj && change.obj.type) parts.push("shape=" + change.obj.type);
    if (change.operations && change.operations.length) {
      const attrs = change.operations
        .map(function (op) { return op.attr; })
        .filter(Boolean);
      if (attrs.length) parts.push("attrs=" + attrs.join(","));
    }
    return parts.join(" ");
  }

  function summarizeChanges(changes) {
    if (!changes || !changes.length) return "(empty)";
    return changes.map(summarizeChange).join("; ");
  }

  function summarizeSkipped(skipped) {
    if (!skipped) return "";
    const items = Array.isArray(skipped) ? skipped : [skipped];
    return items.map(function (item) {
      if (!item || typeof item !== "object") return String(item);
      const type = item.type || "unknown";
      const reason = item.reason ? " (" + item.reason + ")" : "";
      return String(type) + reason;
    }).join("; ");
  }

  function refreshSyncStatus() {
    fetch("/dbg/actions/graph-sync-status")
      .then(function (resp) { return resp.text(); })
      .then(function (text) {
        const status = parseTransitMap(JSON.parse(text));
        if (status["graph-revn"] !== undefined) {
          syncRevnEl.textContent = String(status["graph-revn"]);
        }
        if (status.sync && status.sync.error) {
          syncErrorEl.style.display = "inline";
          syncErrorEl.textContent = "sync error: " + status.sync.error;
        } else if (status.sync && status.sync["last-skipped"]
                   && summarizeSkipped(status.sync["last-skipped"])) {
          syncErrorEl.style.display = "inline";
          syncErrorEl.textContent =
            "some changes skipped: "
            + summarizeSkipped(status.sync["last-skipped"])
            + " (use full reload if needed)";
        } else {
          syncErrorEl.style.display = "none";
          syncErrorEl.textContent = "";
        }
      })
      .catch(function () {});
  }

  function appendChange(revn, summary) {
    changelogEmpty.style.display = "none";
    changelog.style.display = "table";

    const row = document.createElement("tr");
    const revnCell = document.createElement("td");
    const changesCell = document.createElement("td");

    revnCell.textContent = String(revn);
    changesCell.textContent = summary;
    row.appendChild(revnCell);
    row.appendChild(changesCell);
    changelogBody.appendChild(row);
    row.scrollIntoView({ block: "nearest" });
  }

  function handleMessage(raw) {
    let msg;
    try {
      msg = parseTransitMap(JSON.parse(raw));
    } catch (_err) {
      return;
    }

    if (msg.type !== "file-change" || msg["file-id"] !== fileId) return;

    appendChange(msg.revn, summarizeChanges(msg.changes));
    setTimeout(refreshSyncStatus, 150);
  }

  function subscribe() {
    if (ws && ws.readyState === WebSocket.OPEN) {
      ws.send(encodeSubscribe(fileId));
    }
  }

  function connect() {
    ws = new WebSocket(wsUrl);
    wsStatus.textContent = "connecting…";

    ws.addEventListener("open", function () {
      wsStatus.textContent = "subscribed";
      subscribe();
    });

    ws.addEventListener("message", function (event) {
      handleMessage(event.data);
    });

    ws.addEventListener("close", function () {
      wsStatus.textContent = "disconnected";
    });

    ws.addEventListener("error", function () {
      wsStatus.textContent = "error";
    });
  }

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

  function renderQueryOutput(data) {
    const output = document.getElementById("graph-query-output");
    if (!output) return;

    if (data.error) {
      output.innerHTML =
        "<fieldset><legend>Error</legend>"
        + "<pre>" + escapeHtml(data.error) + "</pre></fieldset>";
      return;
    }

    const result = data["query-result"];
    if (!result) {
      output.innerHTML = "";
      return;
    }

    const truncated = result["truncated?"] ? ", truncated" : "";
    let html =
      "<fieldset><legend>Results ("
      + escapeHtml(String(result["row-count"]))
      + " rows" + truncated + ")</legend>"
      + "<table border=\"1\" cellpadding=\"4\" cellspacing=\"0\""
      + " style=\"border-collapse: collapse; width: 100%;\">"
      + "<thead><tr>";

    (result.columns || []).forEach(function (column) {
      html += "<th>" + escapeHtml(column) + "</th>";
    });
    html += "</tr></thead><tbody>";

    (result.rows || []).forEach(function (row) {
      html += "<tr>";
      row.forEach(function (cell) {
        html += "<td><code>" + escapeHtml(cell) + "</code></td>";
      });
      html += "</tr>";
    });

    html += "</tbody></table></fieldset>";
    output.innerHTML = html;
  }

  const queryForm = document.getElementById("graph-query-form");
  if (queryForm) {
    queryForm.addEventListener("submit", function (event) {
      event.preventDefault();
      const formData = new FormData(queryForm);
      fetch("/dbg/actions/graph-query", {
        method: "POST",
        headers: { "Accept": "application/json" },
        body: formData
      })
        .then(function (resp) { return resp.text(); })
        .then(function (text) {
          renderQueryOutput(parseTransitMap(JSON.parse(text)));
        })
        .catch(function (err) {
          renderQueryOutput({ error: String(err) });
        });
    });
  }

  connect();
  refreshSyncStatus();

  window.addEventListener("beforeunload", function () {
    if (ws && ws.readyState === WebSocket.OPEN) {
      ws.send(encodeUnsubscribe(fileId));
      ws.close();
    }
  });
})();
</script>
{% endif %}
{% endblock %}