4 files changed, 326 insertions, 0 deletions
diff --git a/content-system/loader/loader.ts b/content-system/loader/loader.ts
new file mode 100644
index 0000000..97a6c0f
--- /dev/null
+++ b/content-system/loader/loader.ts
@@ -0,0 +1,83 @@
+import type { ContentManifest, ChunkPayload } from '@hollowdark/content-system/manifest/schema'
+import { HollowdarkContentCache } from '@hollowdark/persistence/db'
+import type { JsonValue } from '@hollowdark/utils/types/json'
+
+let cacheInstance: HollowdarkContentCache | null = null
+
+function cache(): HollowdarkContentCache {
+  if (cacheInstance === null) {
+    cacheInstance = new HollowdarkContentCache()
+  }
+  return cacheInstance
+}
+
+const MANIFEST_CACHE_KEY = 'latest'
+
+/**
+ * Fetch the content manifest from static hosting. Falls back to the last
+ * cached manifest when the network request fails — the game works fully
+ * offline once the first download has succeeded.
+ */
+export async function fetchManifest(baseUrl: string): Promise<ContentManifest> {
+  const url = `${baseUrl}/content-manifest.json`
+  try {
+    const response = await fetch(url, { cache: 'no-cache' })
+    if (!response.ok) throw new Error(`manifest ${response.status}`)
+    const live = (await response.json()) as ContentManifest
+    await cache().manifest.put({
+      id: MANIFEST_CACHE_KEY,
+      contentVersion: live.content_version,
+      appVersion: live.app_version,
+      generatedAt: live.generated_at,
+      payload: live as unknown as JsonValue
+    })
+    return live
+  } catch {
+    const cached = await cache().manifest.get(MANIFEST_CACHE_KEY)
+    if (cached === undefined) {
+      throw new Error('Content manifest unavailable and no cached copy exists.')
+    }
+    return cached.payload as unknown as ContentManifest
+  }
+}
+
+/**
+ * Load a single chunk by id, using the manifest to resolve the hashed
+ * URL. Served from the IndexedDB cache whenever the cached hash matches
+ * the manifest's; refetched otherwise. Falls back to the cached payload
+ * on network failure so gameplay continues offline.
+ */
+export async function loadChunk(
+  chunkId: string,
+  manifest: ContentManifest,
+  baseUrl: string
+): Promise<ChunkPayload> {
+  const entry = manifest.chunks[chunkId]
+  if (entry === undefined) {
+    throw new Error(`Content chunk not listed in manifest: ${chunkId}`)
+  }
+
+  const cached = await cache().content.get(chunkId)
+  if (cached !== undefined && cached.hash === entry.hash) {
+    return { chunkId, data: cached.data, version: cached.version, hash: cached.hash }
+  }
+
+  try {
+    const response = await fetch(`${baseUrl}${entry.url}`)
+    if (!response.ok) throw new Error(`chunk ${response.status}`)
+    const data = (await response.json()) as JsonValue
+    await cache().content.put({
+      chunkId,
+      version: entry.version,
+      hash: entry.hash,
+      data,
+      fetchedAt: new Date().toISOString()
+    })
+    return { chunkId, data, version: entry.version, hash: entry.hash }
+  } catch (err) {
+    if (cached !== undefined) {
+      return { chunkId, data: cached.data, version: cached.version, hash: cached.hash }
+    }
+    throw err
+  }
+}
diff --git a/content-system/manifest/schema.ts b/content-system/manifest/schema.ts
new file mode 100644
index 0000000..07eb76f
--- /dev/null
+++ b/content-system/manifest/schema.ts
@@ -0,0 +1,35 @@
+import type { JsonValue } from '@hollowdark/utils/types/json'
+
+/**
+ * A single entry in the content manifest — one compiled chunk served
+ * from static hosting. `url` is relative to the app base path.
+ */
+export interface ManifestEntry {
+  readonly version: string
+  readonly hash: string
+  readonly url: string
+  readonly size_bytes: number
+}
+
+/**
+ * The content manifest — an index of every compiled content chunk the
+ * client might need. Fetched once at session start; diffed against the
+ * cached copy to decide which chunks must be re-downloaded.
+ */
+export interface ContentManifest {
+  readonly content_version: string
+  readonly app_version: string
+  readonly generated_at: string
+  readonly chunks: Readonly<Record<string, ManifestEntry>>
+}
+
+/** Chunk ids are stable, slash-separated, human-readable. */
+export type ChunkId = string
+
+/** A raw chunk payload as received from the network. */
+export interface ChunkPayload {
+  readonly chunkId: ChunkId
+  readonly data: JsonValue
+  readonly version: string
+  readonly hash: string
+}
diff --git a/content-system/regions/schema.ts b/content-system/regions/schema.ts
new file mode 100644
index 0000000..6d053a5
--- /dev/null
+++ b/content-system/regions/schema.ts
@@ -0,0 +1,117 @@
+import type { Brand } from '@hollowdark/utils/types/brand'
+
+/** Stable slug identifying a region across versions. */
+export type RegionId = Brand<string, 'RegionId'>
+
+/** Stable slug identifying a city across versions. */
+export type CityId = Brand<string, 'CityId'>
+
+/** Stable slug identifying an institution across versions. */
+export type InstitutionContentId = Brand<string, 'InstitutionContentId'>
+
+/** Dominant economic sector categories used across the world's regions. */
+export type EconomicSector =
+  | 'agriculture'
+  | 'publishing'
+  | 'education'
+  | 'finance'
+  | 'government'
+  | 'industry'
+  | 'logistics'
+  | 'mining'
+  | 'oil_and_gas'
+  | 'renewable_energy'
+  | 'services'
+  | 'shipping'
+  | 'technology'
+  | 'timber'
+  | 'tourism'
+  | 'trades'
+  | 'entertainment'
+  | 'fishing'
+  | 'retail'
+  | 'design'
+  | 'construction'
+  | 'healthcare'
+  | 'transportation'
+
+/** Coarse measure of income disparity in a region. */
+export type Inequality = 'flat' | 'moderate' | 'high' | 'extreme'
+
+/**
+ * Share of the population affiliated, nominally or actively, with each of
+ * the three main religions plus secular/unaffiliated. Values in [0, 1],
+ * sum ~= 1 per region.
+ */
+export interface ReligiousComposition {
+  readonly covenant: number
+  readonly old_faith: number
+  readonly quiet_path: number
+  readonly secular: number
+}
+
+/** Climate texture — prose for scenes, plus rough numeric anchors. */
+export interface RegionClimate {
+  readonly summary: string
+  readonly temperature_range_c: readonly [number, number]
+  readonly annual_rainfall_mm: number
+}
+
+/** The role a city plays relative to its region. */
+export type CityRole =
+  | 'metropolis'
+  | 'port'
+  | 'university_town'
+  | 'industrial_town'
+  | 'capital'
+  | 'agricultural_hub'
+  | 'resort'
+  | 'mining_town'
+  | 'frontier_town'
+  | 'tourist'
+  | 'mill_town'
+
+/** Region-level content source, one YAML file per region. */
+export interface RegionContent {
+  readonly id: RegionId
+  readonly display_name: string
+  readonly population_weight: number
+  readonly climate: RegionClimate
+  readonly economy: {
+    readonly summary: string
+    readonly dominant_sectors: readonly EconomicSector[]
+    readonly inequality: Inequality
+  }
+  readonly culture: {
+    readonly summary: string
+    readonly texture: string
+  }
+  readonly class_texture: string
+  readonly religion: ReligiousComposition
+  readonly city_ids: readonly CityId[]
+  readonly institution_ids: readonly InstitutionContentId[]
+  readonly stereotypes: {
+    readonly held_by_others: string
+    readonly self_image: string
+  }
+}
+
+/** City-level content source, one YAML file per city. */
+export interface CityContent {
+  readonly id: CityId
+  readonly region_id: RegionId
+  readonly display_name: string
+  readonly population: number
+  readonly role: CityRole
+  readonly character: string
+}
+
+/** Institution-level content source, one YAML file per institution. */
+export interface InstitutionContent {
+  readonly id: InstitutionContentId
+  readonly region_id: RegionId
+  readonly city_id: CityId
+  readonly display_name: string
+  readonly kind: 'publisher' | 'university' | 'hospital' | 'newspaper' | 'employer' | 'religious' | 'government'
+  readonly character: string
+}
diff --git a/content-system/registry/registry.ts b/content-system/registry/registry.ts
new file mode 100644
index 0000000..38f0a91
--- /dev/null
+++ b/content-system/registry/registry.ts
@@ -0,0 +1,91 @@
+import type {
+  CityContent,
+  CityId,
+  InstitutionContent,
+  InstitutionContentId,
+  RegionContent,
+  RegionId
+} from '@hollowdark/content-system/regions/schema'
+import type { ContentManifest } from '@hollowdark/content-system/manifest/schema'
+import { loadChunk } from '@hollowdark/content-system/loader/loader'
+
+/**
+ * The in-memory content registry. Populated once at session start by
+ * walking the manifest and loading every chunk into typed maps. All
+ * simulation-time reads go through here — synchronous, typed, fast.
+ */
+export class ContentRegistry {
+  readonly #regions = new Map<RegionId, RegionContent>()
+  readonly #cities = new Map<CityId, CityContent>()
+  readonly #institutions = new Map<InstitutionContentId, InstitutionContent>()
+
+  get regions(): ReadonlyMap<RegionId, RegionContent> {
+    return this.#regions
+  }
+
+  get cities(): ReadonlyMap<CityId, CityContent> {
+    return this.#cities
+  }
+
+  get institutions(): ReadonlyMap<InstitutionContentId, InstitutionContent> {
+    return this.#institutions
+  }
+
+  addRegion(region: RegionContent): void {
+    this.#regions.set(region.id, region)
+  }
+
+  addCity(city: CityContent): void {
+    this.#cities.set(city.id, city)
+  }
+
+  addInstitution(institution: InstitutionContent): void {
+    this.#institutions.set(institution.id, institution)
+  }
+
+  region(id: RegionId): RegionContent {
+    const value = this.#regions.get(id)
+    if (value === undefined) throw new Error(`Unknown region: ${id}`)
+    return value
+  }
+
+  city(id: CityId): CityContent {
+    const value = this.#cities.get(id)
+    if (value === undefined) throw new Error(`Unknown city: ${id}`)
+    return value
+  }
+
+  institution(id: InstitutionContentId): InstitutionContent {
+    const value = this.#institutions.get(id)
+    if (value === undefined) throw new Error(`Unknown institution: ${id}`)
+    return value
+  }
+}
+
+/**
+ * Populate a fresh registry from the supplied manifest. Fetches every
+ * chunk whose id begins with a world-content prefix; ignores unknown
+ * prefixes so the registry can grow without breaking older clients.
+ */
+export async function populateFromManifest(
+  manifest: ContentManifest,
+  baseUrl: string
+): Promise<ContentRegistry> {
+  const registry = new ContentRegistry()
+
+  const entries = Object.entries(manifest.chunks)
+  await Promise.all(
+    entries.map(async ([chunkId]) => {
+      const { data } = await loadChunk(chunkId, manifest, baseUrl)
+      if (chunkId.startsWith('world/regions/')) {
+        registry.addRegion(data as unknown as RegionContent)
+      } else if (chunkId.startsWith('world/cities/')) {
+        registry.addCity(data as unknown as CityContent)
+      } else if (chunkId.startsWith('world/institutions/')) {
+        registry.addInstitution(data as unknown as InstitutionContent)
+      }
+    })
+  )
+
+  return registry
+}