Signage/tests/schema.test.ts

import { createHash } from "node:crypto";
import { readFile } from "node:fs/promises";
import {
  parseDrizzleMigrationJournal,
  parseModuleManifest,
  parseModuleMigrationPolicy,
} from "@ekklesia/module-sdk";
import { getTableConfig, type PgTable } from "drizzle-orm/pg-core";
import { describe, expect, it } from "vitest";
import moduleSchema from "../src/schema/index.js";

const tables = moduleSchema.tables as Readonly<Record<string, PgTable>>;

async function readSql(): Promise<string> {
  return readFile(new URL("../drizzle/0000_initial.sql", import.meta.url), "utf8");
}

describe("Signage schema", () => {
  it("declares every table Signage's data model needs, and nothing outside its namespace", () => {
    const physicalNames = Object.values(tables)
      .map((table) => getTableConfig(table).name)
      .sort();

    expect(physicalNames).toEqual([
      "signage_channel_groups",
      "signage_channels",
      "signage_image_assets",
      "signage_image_renditions",
      "signage_playback_states",
      "signage_provider_sources",
      "signage_selection_variants",
      "signage_selections",
      "signage_timeline_slots",
      "signage_timelines",
      "signage_viewers",
    ]);
    for (const table of Object.values(tables)) {
      const config = getTableConfig(table);
      // The platform-managed default schema, never a custom PostgreSQL schema.
      expect(config.schema).toBeUndefined();
      expect(config.name.length).toBeLessThanOrEqual(63);
    }
    expect(moduleSchema.moduleId).toBe("signage");
  });

  it("never points a foreign key outside this module", () => {
    const owned = new Set(Object.values(tables).map((table) => getTableConfig(table).name));

    for (const table of Object.values(tables)) {
      for (const foreignKey of getTableConfig(table).foreignKeys) {
        const reference = foreignKey.reference();
        expect(owned).toContain(getTableConfig(reference.foreignTable).name);
      }
    }
  });

  it("stores another module's identities as opaque text rather than as a reference", () => {
    // A provider, its sources, and its items belong to another module. Signage stores what it was
    // told and can never join to it — which is exactly what keeps the two independently installable.
    const opaque = [
      ["providerSources", "provider_id"],
      ["providerSources", "source_id"],
      ["timelineSlots", "provider_id"],
      ["timelineSlots", "item_id"],
      ["selections", "provider_id"],
      ["selections", "item_id"],
      ["viewers", "device_id"],
    ] as const;

    for (const [tableName, columnName] of opaque) {
      const table = tables[tableName];
      if (!table) {
        throw new Error(`Signage's schema is missing ${tableName}.`);
      }
      const config = getTableConfig(table);
      const column = config.columns.find((candidate) => candidate.name === columnName);
      expect(column?.getSQLType()).toBe("text");
      const referenced = config.foreignKeys.some((foreignKey) =>
        foreignKey.reference().columns.some((candidate) => candidate.name === columnName),
      );
      expect(referenced).toBe(false);
    }
  });

  it("stores logical object keys and never a signed delivery URL", async () => {
    const sql = await readSql();

    expect(sql).toContain('"original_object_key" text NOT NULL');
    expect(sql).toContain('"object_key" text NOT NULL');
    // A read URL is a bearer capability with an expiry in it. Nothing in this schema can hold one.
    for (const forbidden of ["url", "signed_url", "presigned", "delivery_url"]) {
      expect(sql.toLowerCase()).not.toContain(`"${forbidden}"`);
    }
  });

  it("makes the invariants playback depends on the database's job, not a convention", async () => {
    const sql = await readSql();

    // Content-addressed identity: the same bytes are the same asset.
    expect(sql).toContain("signage_image_assets_content_sha256_key");
    // A slot position is unique within its timeline.
    expect(sql).toContain("signage_timeline_slots_position_key");
    // Exactly one default channel per group.
    expect(sql).toContain("signage_channels_group_default_key");
    // A slot is a provider source or a pinned item, never both and never neither.
    expect(sql).toContain("signage_timeline_slots_reference_check");
    // History is ordered and gapless per group.
    expect(sql).toContain("signage_selections_group_sequence_key");
    // One payload per audience per selection.
    expect(sql).toContain("signage_selection_variants_selection_audience_key");
    // Deleting a slot must not erase what already happened on screen.
    expect(sql).toMatch(/signage_selections_slot_id_.*ON DELETE set null/su);
  });

  it("packages one reviewed, non-destructive, forward-only migration", async () => {
    const [journalInput, policyInput, manifestInput, bytes] = await Promise.all([
      readFile(new URL("../drizzle/meta/_journal.json", import.meta.url), "utf8"),
      readFile(new URL("../drizzle/meta/_ekklesia.json", import.meta.url), "utf8"),
      readFile(new URL("../ekklesia.module.json", import.meta.url), "utf8"),
      readFile(new URL("../drizzle/0000_initial.sql", import.meta.url)),
    ]);
    const journal = parseDrizzleMigrationJournal(JSON.parse(journalInput) as unknown);
    const policy = parseModuleMigrationPolicy(JSON.parse(policyInput) as unknown);
    const manifest = parseModuleManifest(JSON.parse(manifestInput) as unknown);

    expect(journal.entries.map((entry) => entry.tag)).toEqual(["0000_initial"]);
    expect(policy).toMatchObject({
      moduleId: "signage",
      entries: [{ tag: "0000_initial", destructive: { mode: "none" } }],
    });
    expect(manifest.entrypoints.migrations).toBe("./drizzle");
    expect(manifest.entrypoints.schema).toBe("./dist/schema/index.js");
    // Pinned deliberately. Core compares the exact bytes against its applied history and refuses a
    // changed migration, so an accidental edit here must fail in this repository first.
    expect(createHash("sha256").update(bytes).digest("hex")).toBe(
      "fbbc448f9a951818bf37e89849ccdbfb55f3221260db0f59d1a2b245cc126838",
    );
  });
});