Wire the begin-state detector through Dexie via world and people repositories

4 files changed, 71 insertions, 5 deletions

diff --git a/loading/session.ts b/loading/session.ts
index a1a685b..788f0e6 100644
--- a/loading/session.ts
+++ b/loading/session.ts
@@ -1,3 +1,6 @@
+import { getPerson } from '@hollowdark/persistence/people'
+import { getCurrentWorld } from '@hollowdark/persistence/worlds'
+
 /**
  * The three states the Begin screen can render.
  *
@@ -16,11 +19,23 @@ export type BeginState =
   | { readonly kind: 'returning-no-active' }
 
 /**
- * Inspect device-local state and decide which Begin variant to show. The
- * real implementation queries IndexedDB for worlds and the currently
- * active player character; while persistence is still being wired up this
- * returns `first-ever` unconditionally.
+ * Inspect device-local state and decide which Begin variant to show. Reads
+ * the single world record (design invariant) and, when a current player
+ * character is set, reads their name for the continue prompt.
  */
 export async function detectBeginState(): Promise<BeginState> {
-  return { kind: 'first-ever' }
+  const world = await getCurrentWorld()
+  if (world === null) return { kind: 'first-ever' }
+
+  const activeId = world.currentPlayerCharacterId
+  if (activeId === null) return { kind: 'returning-no-active' }
+
+  const active = await getPerson(activeId)
+  if (active === null) return { kind: 'returning-no-active' }
+
+  return { kind: 'returning-active', characterName: displayName(active.name) }
+}
+
+function displayName(name: { given: string; preferredName: string | null }): string {
+  return name.preferredName ?? name.given
 }
diff --git a/persistence/client.ts b/persistence/client.ts
new file mode 100644
index 0000000..7e2468b
--- /dev/null
+++ b/persistence/client.ts
@@ -0,0 +1,16 @@
+import { HollowdarkUserData } from '@hollowdark/persistence/db'
+
+let userData: HollowdarkUserData | null = null
+
+/**
+ * The shared `HollowdarkUserData` Dexie client. Lazily constructed on
+ * first access so pure unit tests that never touch persistence do not
+ * open an IndexedDB connection. Repositories should import this helper
+ * rather than instantiating `HollowdarkUserData` themselves.
+ */
+export function userDataDb(): HollowdarkUserData {
+  if (userData === null) {
+    userData = new HollowdarkUserData()
+  }
+  return userData
+}
diff --git a/persistence/people.ts b/persistence/people.ts
new file mode 100644
index 0000000..c26819c
--- /dev/null
+++ b/persistence/people.ts
@@ -0,0 +1,14 @@
+import { userDataDb } from '@hollowdark/persistence/client'
+import type { PersonId } from '@hollowdark/engine/entities/base'
+import type { Person } from '@hollowdark/engine/entities/person'
+
+/** Fetch a single person by id, or `null` when the row is missing. */
+export async function getPerson(id: PersonId): Promise<Person | null> {
+  const row = await userDataDb().people.get(id)
+  return row ?? null
+}
+
+/** Persist a person record. Replaces any existing row with the same id. */
+export async function savePerson(person: Person): Promise<void> {
+  await userDataDb().people.put(person)
+}
diff --git a/persistence/worlds.ts b/persistence/worlds.ts
new file mode 100644
index 0000000..0938a84
--- /dev/null
+++ b/persistence/worlds.ts
@@ -0,0 +1,21 @@
+import { userDataDb } from '@hollowdark/persistence/client'
+import type { World } from '@hollowdark/engine/entities/world'
+
+/**
+ * The single world a player has on this device, or `null` if they have
+ * never begun one. Design invariant: one continuous world per player.
+ * Should the table ever hold more than one row, the earliest-created
+ * row wins — newer rows would only arise from explicit import.
+ */
+export async function getCurrentWorld(): Promise<World | null> {
+  const rows = await userDataDb().worlds.toArray()
+  if (rows.length === 0) return null
+  return rows.reduce((earliest, candidate) =>
+    candidate.createdAt < earliest.createdAt ? candidate : earliest
+  )
+}
+
+/** Persist a world record. Replaces any existing row with the same id. */
+export async function saveWorld(world: World): Promise<void> {
+  await userDataDb().worlds.put(world)
+}