import { readFile } from "node:fs/promises";
import { describe, expect, it } from "vitest";
import { hasCompleteSeedreamLayerMetadata } from "@/lib/seedream/layer-composition";

describe("Seedream layer composition persistence contract", () => {
  it("only enables the editable layer project for complete provider layer metadata", () => {
    expect(hasCompleteSeedreamLayerMetadata([
      { z_index: 0, size: "2048x2048" },
      { z_index: 1, size: "600x300" }
    ], 2)).toBe(true);
    expect(hasCompleteSeedreamLayerMetadata([
      { size: "2048x2048" },
      { size: "600x300" }
    ], 2)).toBe(false);
    expect(hasCompleteSeedreamLayerMetadata([{ z_index: 0 }], 2)).toBe(false);
    expect(hasCompleteSeedreamLayerMetadata([{ z_index: 0 }], 1)).toBe(false);
  });

  it("ships a versioned PostgreSQL document table that follows generation-job deletion", async () => {
    const migration = await readFile(new URL("../database/migrations/0005_seedream_layer_compositions.sql", import.meta.url), "utf8");

    expect(migration).toContain("create table if not exists public.seedream_layer_compositions");
    expect(migration).toContain("references public.generation_jobs(id) on delete cascade");
    expect(migration).toContain("layers jsonb not null");
    expect(migration).toContain("version bigint not null");
    expect(migration).toContain("jsonb_typeof(layers) = 'array'");
  });

  it("exposes owner-scoped GET/PUT routes and provisions application-role privileges", async () => {
    const [surface, privileges, handler] = await Promise.all([
      readFile(new URL("../contracts/http/route-surface.v1.json", import.meta.url), "utf8"),
      readFile(new URL("../scripts/migrate-postgres.mjs", import.meta.url), "utf8"),
      readFile(new URL("../backend/internal/httpapi/layer_compositions.go", import.meta.url), "utf8")
    ]);

    expect(surface).toContain('"GET", "path": "/api/layer-compositions/{id}"');
    expect(surface).toContain('"PUT", "path": "/api/layer-compositions/{id}"');
    expect(privileges).toContain('["seedream_layer_compositions", "SELECT, INSERT, UPDATE, DELETE"]');
    expect(handler).toContain("handler.platform.Authorize");
    expect(handler).toContain("jobs.Scope{OwnerID: session.User.ID}");
  });
});