From c76e5b0a5f727a718b73983f083b92db6c9db62c Mon Sep 17 00:00:00 2001
From: PJ <ipriyanshujain@gmail.com>
Date: Sat, 20 Jun 2026 12:28:43 -0400
Subject: [PATCH] feat(model): add document model and book store

---
 src/model/book.ts    | 81 ++++++++++++++++++++++++++++++++++++++++++++
 src/store/useBook.ts | 48 ++++++++++++++++++++++++++
 2 files changed, 129 insertions(+)
 create mode 100644 src/model/book.ts
 create mode 100644 src/store/useBook.ts

diff --git a/src/model/book.ts b/src/model/book.ts
new file mode 100644
index 0000000..089f749
--- /dev/null
+++ b/src/model/book.ts
@@ -0,0 +1,81 @@
+import type { JSONContent } from "@tiptap/core";
+
+export type TrimSize = "6x9" | "5.5x8.5" | "5x8" | "a5";
+export type FigurePlacement = "inline" | "full-width" | "full-page" | "float-top";
+
+export interface BookMetadata {
+  title: string;
+  subtitle: string;
+  author: string;
+  isbn: string;
+  language: string;
+}
+
+export interface BookSettings {
+  trim: TrimSize;
+  bleed: boolean;
+}
+
+export interface Chapter {
+  id: string;
+  title: string;
+  content: JSONContent;
+}
+
+export interface Book {
+  schema: "margin/1";
+  metadata: BookMetadata;
+  theme: string;
+  settings: BookSettings;
+  chapters: Chapter[];
+}
+
+function paragraph(text: string): JSONContent {
+  return { type: "paragraph", content: [{ type: "text", text }] };
+}
+
+function emptyDoc(): JSONContent {
+  return { type: "doc", content: [{ type: "paragraph" }] };
+}
+
+export function createChapter(title = "Untitled chapter"): Chapter {
+  return { id: crypto.randomUUID(), title, content: emptyDoc() };
+}
+
+export function createBook(): Book {
+  return {
+    schema: "margin/1",
+    metadata: { title: "Untitled", subtitle: "", author: "", isbn: "", language: "en" },
+    theme: "quiet-press",
+    settings: { trim: "6x9", bleed: true },
+    chapters: [createChapter("Chapter One")],
+  };
+}
+
+export function starterBook(): Book {
+  const book = createBook();
+  book.chapters = [
+    {
+      id: crypto.randomUUID(),
+      title: "The Lighthouse",
+      content: {
+        type: "doc",
+        content: [
+          paragraph(
+            "The lamp had not been lit in thirty years, and yet the islanders still set their clocks by a light that no longer came. Mara climbed the iron stair each evening out of a habit older than memory, and each evening she found the same dark glass waiting, patient as the sea."
+          ),
+          paragraph(
+            "Her grandfather had kept the flame. Her mother had let it die. Between those two facts lay the whole of the family's quarrel with the water, and Mara had inherited both the quarrel and the key that opened the lantern room."
+          ),
+          { type: "horizontalRule" },
+          paragraph(
+            "Morning came the color of pewter. The tide had left its usual accounting along the shingle, and Mara walked the length of it without hurry, naming each thing as her grandfather had named them to her."
+          ),
+        ],
+      },
+    },
+    createChapter("Salt and Iron"),
+    createChapter("What the Tide Left"),
+  ];
+  return book;
+}
diff --git a/src/store/useBook.ts b/src/store/useBook.ts
new file mode 100644
index 0000000..033b75e
--- /dev/null
+++ b/src/store/useBook.ts
@@ -0,0 +1,48 @@
+import { create } from "zustand";
+import type { JSONContent } from "@tiptap/core";
+import { type Book, createChapter, starterBook } from "../model/book";
+
+interface BookState {
+  book: Book;
+  activeChapterId: string;
+  dirty: boolean;
+  setActiveChapter: (id: string) => void;
+  setChapterContent: (id: string, content: JSONContent) => void;
+  setChapterTitle: (id: string, title: string) => void;
+  addChapter: () => void;
+}
+
+export const useBook = create<BookState>((set) => {
+  const book = starterBook();
+  return {
+    book,
+    activeChapterId: book.chapters[0].id,
+    dirty: false,
+    setActiveChapter: (id) => set({ activeChapterId: id }),
+    setChapterContent: (id, content) =>
+      set((s) => ({
+        dirty: true,
+        book: {
+          ...s.book,
+          chapters: s.book.chapters.map((c) => (c.id === id ? { ...c, content } : c)),
+        },
+      })),
+    setChapterTitle: (id, title) =>
+      set((s) => ({
+        dirty: true,
+        book: {
+          ...s.book,
+          chapters: s.book.chapters.map((c) => (c.id === id ? { ...c, title } : c)),
+        },
+      })),
+    addChapter: () =>
+      set((s) => {
+        const chapter = createChapter();
+        return {
+          activeChapterId: chapter.id,
+          dirty: true,
+          book: { ...s.book, chapters: [...s.book.chapters, chapter] },
+        };
+      }),
+  };
+});