// Shared fixtures. Every test works in its own temporary directory and
// points MOSAIC_CONFIG there; nothing reads the real ~/.config, a real
// token, a real binding, or the real human transport.

import { chmodSync, mkdirSync, mkdtempSync, rmSync, writeFileSync } from "node:fs";
import { tmpdir } from "node:os";
import { join } from "node:path";
import { PassThrough } from "node:stream";
import { BusError, Broker } from "../../bus/src/broker.mjs";
import { Store } from "../../bus/src/store.mjs";
import { businessDoc, rolesCopy, systemConfig, writeJson } from "../../business/tests/helpers.mjs";
import { AGENT_MARKERS } from "../src/transport.mjs";

export function tmp(t, prefix = "mosaic-cli-") {
  const root = mkdtempSync(join(tmpdir(), prefix));
  t.after(() => rmSync(root, { recursive: true, force: true }));
  return root;
}

// The environment with every agent marker removed: the test runner itself
// may run under an agent, and the commands refuse there.
export function humanEnv(extra = {}) {
  const env = { ...process.env, ...extra };
  for (const k of AGENT_MARKERS) delete env[k];
  delete env.NODE_TEST_CONTEXT;
  return env;
}

// A config directory with the system config, the roles and business `id`.
export function fixture(root, id = "acme", edit = (doc) => doc) {
  const config = systemConfig(root);
  const roles = rolesCopy(root);
  const doc = edit(businessDoc(root, id));
  writeJson(join(root, "config", "businesses", `${id}.json`), doc);
  return { config, roles, dataRoot: join(root, "data"), doc, env: humanEnv({ MOSAIC_CONFIG: config, MOSAIC_ROLES_DIR: roles }) };
}

export function notifyConfig(dataRoot, business, binding) {
  // The journal sits beside notify.json and refuses a directory looser than 0700.
  mkdirSync(join(dataRoot, "notify", business), { recursive: true, mode: 0o700 });
  return writeJson(join(dataRoot, "notify", business, "notify.json"), { notifyVersion: 1, binding });
}

// An io for main(): captured stdout and stderr, a stdin that is not a TTY.
export function io(env = humanEnv()) {
  const out = { text: "" };
  const err = { text: "" };
  const stdin = new PassThrough();
  stdin.isTTY = false;
  return {
    env,
    stdin,
    stdout: { write: (s) => ((out.text += s), true) },
    stderr: { write: (s) => ((err.text += s), true) },
    out,
    err,
  };
}

export const OPTIONS = [
  { key: "yes", text: "Allow" },
  { key: "no", text: "Decline" },
];

export const BUSINESSES = {
  demo: {
    id: "demo",
    human: "jason",
    arbiters: { technical: "cto", delivery: "pm" },
    roles: {
      pm: { authority: { withinRole: ["message.send"], crossRole: [] } },
      cto: { authority: { withinRole: ["message.send"], crossRole: [] } },
      coder: { authority: { withinRole: ["message.send"], crossRole: ["task.scope.change"] } },
    },
  },
};

// An in-process broker with a claimed coder and the human's capability.
// transport(business) mirrors humanTransport: errors carry the bus code.
export function broker(t) {
  const root = tmp(t, "mosaic-cli-bus-");
  const store = new Store(root);
  t.after(() => store.close());
  const b = new Broker({ store, businesses: BUSINESSES });
  const coder = b.bindLaunch({ business: "demo", role: "coder", run: "coder-run", harness: "pi", address: "coder-run" });
  b.request(coder, { verb: "role.claim" });
  const human = b.bindHuman({ business: "demo", human: "jason", via: "cli", outsideAgent: true });
  const reader = b.bindReader({ business: "demo" });
  const calls = [];
  const transport = (business) => async (verb, args = {}) => {
    calls.push({ business, verb, args });
    try {
      return structuredClone(b.request(human, { verb, args }));
    } catch (e) {
      if (!(e instanceof BusError)) throw e;
      const error = new Error(e.code);
      error.code = e.code;
      throw error;
    }
  };
  const raise = (action, extra = {}) =>
    b.request(coder, { verb: "decision.raise", args: { action, question: "Push the release?", options: OPTIONS, recommendation: "no", blocking: false, ...extra } });
  return { b, store, coder, human, reader, transport, calls, raise, read: (verb, args = {}) => structuredClone(b.request(reader, { verb, args })) };
}

// A script standing in for packages/bus/src/human-cli.mjs: it reads one
// request on stdin and answers from the table in its first argument.
export function fakeCli(root, body) {
  const file = join(root, "fake-human-cli.mjs");
  writeFileSync(file, body);
  chmodSync(file, 0o600);
  return file;
}