import assert from "node:assert/strict";
import fs from "node:fs/promises";
import path from "node:path";
import { execFileSync } from "node:child_process";
import { scaffoldRecipe } from "../src/capability-language/scaffold-recipes.js";
import { planStructure, applyStructure } from "../src/capability-language/structural-plan.js";
import { compileCapabilityResourceSource, compileCapabilitySource } from "../src/capability-language/parser.js";
import { compileExecutionPlan } from "../src/execution-world/plan.js";

/** Exercise the authoring insertion path, then let the Nix gate build its actual flake output. */
export async function emitExecutionScaffold(root: string) {
  await fs.mkdir(root, { recursive: true });
  execFileSync("git", ["-C", root, "init"], { stdio: "ignore" });
  const source = { repository: "https://example.test/scaffold.git", commit: "a".repeat(40) };
  const apply = async (
    command: Parameters<typeof scaffoldRecipe>[1],
    spec: Partial<Parameters<typeof scaffoldRecipe>[2]>,
  ) => applyStructure(await planStructure(root, await scaffoldRecipe(root, command, { source, ...spec })));
  await apply("package", {
    name: "Scaffold",
    id: "package:scaffold",
    revision: "package:scaffold@1",
    template: "typescript-execution",
    tools: { quixos: source, protocol: source, helpers: source, sdk: source },
  });
  for (const [name, execution] of [
    ["echo", "snapshot targets [JavaScript, server]"],
    ["serverEcho", "snapshot targets [server]"],
    ["remoteEcho", "remote"],
  ]) {
    await apply("function", {
      name,
      id: "scaffold:" + name,
      declaration: `function ${name} id "scaffold:${name}" : string -> string execution ${execution};`,
    });
    const file = path.join(root, `src/impl/${name}.ts`);
    const placeholder = await fs.readFile(file, "utf8");
    await fs.writeFile(file, placeholder.replace(/async \(_context\) => \{.*\};/, "async ({ input }) => input;"));
  }
  const pkg = compileCapabilityResourceSource(await fs.readFile(path.join(root, "package.qx"), "utf8"), { source });
  assert.ok(pkg.ok && pkg.resource.kind === "package", JSON.stringify(pkg.diagnostics));
  const workspace = compileCapabilitySource(
    `workspace W id "scaffold-workspace" revision "scaffold-workspace@1" commit "${source.commit}" { import package Scaffold; }`,
    "workspace.qx",
    {
      packages: new Map([["Scaffold", pkg.resource.revision]]),
    },
  );
  assert.ok(workspace.ok, JSON.stringify(workspace.diagnostics));
  await fs.rm(path.join(root, ".quixos"), { recursive: true, force: true });
  await fs.rm(path.join(root, ".git"), { recursive: true, force: true });
  return compileExecutionPlan(workspace.workspace);
}