import assert from "node:assert/strict";
import fs from "node:fs";
import path from "node:path";
import test from "node:test";
import ts from "typescript";

const repoRoot = path.resolve(import.meta.dirname, "../../..");
const sourcePath = path.join(repoRoot, "web/protocol/project-action-mutex.ts");
const transpiled = ts.transpileModule(fs.readFileSync(sourcePath, "utf8"), {
  compilerOptions: { module: ts.ModuleKind.ES2022, target: ts.ScriptTarget.ES2022 },
  fileName: sourcePath,
  reportDiagnostics: true,
});
assert.deepEqual(transpiled.diagnostics, []);
const moduleUrl = `data:text/javascript;base64,${Buffer.from(transpiled.outputText).toString("base64")}`;
const {
  PROJECT_ACTION_CONFLICT_MATRIX,
  acquireProjectAction,
  createProjectActionMutexState,
  releaseProjectAction,
} = await import(moduleUrl);

const action = (kind, sequence) => ({ kind, actionId: `${kind}:${sequence}` });

test("M7-02 keeps the project action conflict matrix symmetric and exclusive", () => {
  for (const requested of ["OPEN", "SAVE", "CLOSE"]) {
    for (const owner of ["OPEN", "SAVE", "CLOSE"]) {
      assert.equal(PROJECT_ACTION_CONFLICT_MATRIX[requested][owner], true);
      assert.equal(PROJECT_ACTION_CONFLICT_MATRIX[requested][owner], PROJECT_ACTION_CONFLICT_MATRIX[owner][requested]);
    }
  }
});

test("M7-02 rejects repeated open with its original owner unchanged", () => {
  const first = action("OPEN", 1);
  const second = action("OPEN", 2);
  const acquired = acquireProjectAction(createProjectActionMutexState(), first);
  assert.equal(acquired.granted, true);
  assert.deepEqual(acquireProjectAction(acquired.state, second), {
    granted: false,
    state: acquired.state,
    conflict: { code: "USER_ACTION_CONFLICT", reason: "REPEATED_OPEN", requested: second, owner: first },
  });
});

test("M7-02 rejects concurrent save and close-during-save with stable reasons", () => {
  const first = action("SAVE", 1);
  const acquired = acquireProjectAction(createProjectActionMutexState(), first);
  assert.equal(acquired.granted, true);
  assert.equal(acquireProjectAction(acquired.state, action("SAVE", 2)).conflict.reason, "CONCURRENT_SAVE");
  assert.equal(acquireProjectAction(acquired.state, action("CLOSE", 3)).conflict.reason, "CLOSE_DURING_SAVE");
});

test("M7-02 only lets the exact owner release the project lock", () => {
  const owner = action("SAVE", 1);
  const acquired = acquireProjectAction(createProjectActionMutexState(), owner);
  assert.equal(acquired.granted, true);
  assert.deepEqual(releaseProjectAction(acquired.state, action("SAVE", 2)), {
    released: false,
    state: acquired.state,
    errorCode: "PROJECT_ACTION_LOCK_IDENTITY_MISMATCH",
  });
  assert.deepEqual(releaseProjectAction(acquired.state, owner), {
    released: true,
    state: { owner: null },
    errorCode: null,
  });
});