2 files changed, 125 insertions, 0 deletions
diff --git a/web/src/doc/index.test.ts b/web/src/doc/index.test.ts
new file mode 100644
index 0000000..331d0a5
--- /dev/null
+++ b/web/src/doc/index.test.ts
@@ -0,0 +1,15 @@
+import { describe, expect, test } from "vitest";
+import Doc from ".";
+
+describe(Doc, () => {
+  describe(Doc.default, () => {
+    const doc = Doc.default();
+
+    test("produces valid grid data", () => {
+      expect(doc.grids.length).toBe(1);
+      expect(doc.grids[0].doc).toBe(doc);
+      expect(doc.grids[0].rows.length).toBe(4);
+      expect(doc.grids[0].rows[0].cells.length).toBe(16);
+    });
+  });
+});
diff --git a/web/src/doc/index.ts b/web/src/doc/index.ts
new file mode 100644
index 0000000..a58faa6
--- /dev/null
+++ b/web/src/doc/index.ts
@@ -0,0 +1,110 @@
+export abstract class DocOp {
+  abstract key: string;
+}
+
+export class CreateGridOp extends DocOp {
+  gridId: string = crypto.randomUUID();
+  rows = 4;
+  key = this.gridId;
+  baseCellsPerRow = 16;
+}
+
+export default class Doc {
+  readonly ops: DocOp[];
+
+  readonly opsByKey: Map<string, readonly DocOp[]>;
+  readonly opsByType: Map<Function, readonly DocOp[]>;
+
+  constructor(ops: DocOp[]) {
+    this.ops = ops;
+
+    const opsByKey = new Map();
+    const opsByType = new Map();
+
+    for (const op of ops) {
+      const maybeKeyOps = opsByKey.get(op.key);
+
+      if (maybeKeyOps) maybeKeyOps.push(op);
+      else opsByKey.set(op.key, [op]);
+
+      const maybeTypeOps = opsByType.get(op.constructor);
+
+      if (maybeTypeOps) maybeTypeOps.push(op);
+      else opsByType.set(op.constructor, [op]);
+    }
+
+    this.opsByKey = opsByKey;
+    this.opsByType = opsByType;
+  }
+
+  static default(): Doc {
+    return new Doc([new CreateGridOp()]);
+  }
+
+  get grids(): Grid[] {
+    const ops = this.opsByType.get(CreateGridOp) ?? [];
+    return ops.map((op) => new Grid(this, op as CreateGridOp));
+  }
+}
+
+export class Grid {
+  readonly doc: Doc;
+  readonly id: string;
+  readonly rows: readonly Row[];
+
+  constructor(doc: Doc, createOp: CreateGridOp) {
+    this.doc = doc;
+    this.id = createOp.gridId;
+
+    const rows: Row[] = [];
+
+    for (let rowIndex = 0; rowIndex < createOp.rows; rowIndex++) {
+      rows.push(new Row(doc, this.id, rowIndex));
+    }
+
+    this.rows = rows;
+  }
+}
+
+export class Row {
+  readonly doc: Doc;
+  readonly gridId: string;
+  readonly index: number;
+  readonly cells: readonly Cell[];
+
+  constructor(doc: Doc, gridId: string, index: number) {
+    this.doc = doc;
+    this.gridId = gridId;
+    this.index = index;
+
+    const createGridOp = doc.opsByType
+      .get(CreateGridOp)
+      ?.find((op) => op.key === gridId)! as CreateGridOp;
+
+    const cells: Cell[] = [];
+
+    for (
+      let cellIndex = 0;
+      cellIndex < createGridOp.baseCellsPerRow;
+      cellIndex++
+    ) {
+      cells.push(new Cell(doc, gridId, index, cellIndex));
+    }
+
+    this.cells = cells;
+  }
+}
+
+export class Cell {
+  readonly doc: Doc;
+  readonly gridId: string;
+  readonly rowIndex: number;
+  readonly index: number;
+
+  constructor(doc: Doc, gridId: string, rowIndex: number, index: number) {
+    this.doc = doc;
+    this.gridId = gridId;
+    this.rowIndex = rowIndex;
+    this.index = index;
+  }
+}