import { setImmediate } from "node:timers";
import { writeFile } from "node:fs/promises";
import { join } from "node:path";
import { describe, expect, it } from "vitest";
import { createTestTempDirectory } from "../../fixtures/temporaryDirectory.js";
import { projectAnalysisError } from "../../../src/domain/analysisErrorProjection.js";
import { analyzeJavaScriptApplication } from "../../support/javascriptApplicationScope.js";

describe("JavaScript application cancellation", () => {
  it("interrupts semantic graph commitment before result validation", async () => {
    const root = await createTestTempDirectory("rea-js-cancel-semantic-");
    await writeFile(
      join(root, "main.js"),
      Array.from(
        { length: 500 },
        (_, index) =>
          `export function inspect${index}(value) { return JSON.stringify(value); }`,
      ).join("\n"),
    );
    const controller = new AbortController();
    const phases: string[] = [];
    const result = await analyzeJavaScriptApplication(
      { input_path: root, format: "directory" },
      {
        signal: controller.signal,
        progress: {
          async report(event) {
            phases.push(event.phase);
            if (event.phase === "seal_javascript_semantic_graph")
              setImmediate(() => controller.abort());
          },
        },
      },
    );
    if (result.ok)
      throw new Error(
        "Cancelled commitment must not publish a successful analysis",
      );
    expect(projectAnalysisError(result.error)).toMatchObject({
      code: "cancelled",
      details: { reason: "cancelled" },
    });
    expect(phases).toContain("seal_javascript_semantic_graph");
    expect(phases).not.toContain("validate_javascript_application_result");
  });

  it("honors control turns and cancellation while preparing one large source for owned analysis (#1462)", async () => {
    const root = await createTestTempDirectory("rea-js-cancel-in-file-");
    await writeFile(
      join(root, "index.js"),
      Array.from(
        { length: 1200 },
        (_, index) =>
          `export function f${index}(){return {name:'f${index}',value:${index}};}`,
      ).join("\n"),
    );
    const controller = new AbortController();
    const phases: string[] = [];
    let turns = 0;
    // Count event-loop turns once the file starts; parsing, analysis and
    // projection of this one file must leave room for them.
    const tick = (): void => {
      turns += 1;
      if (turns === 3) controller.abort();
      else if (!controller.signal.aborted) setImmediate(tick);
    };
    const result = await analyzeJavaScriptApplication(
      { input_path: root, format: "directory" },
      {
        signal: controller.signal,
        progress: {
          async report(event) {
            phases.push(event.phase);
            if (event.phase === "parse_javascript_source") setImmediate(tick);
          },
        },
      },
    );
    if (result.ok) throw new Error("Cancelled analysis must not succeed");
    expect(projectAnalysisError(result.error)).toMatchObject({
      code: "cancelled",
    });
    expect(phases).toContain("parse_javascript_source");
    expect(phases).not.toContain("build_javascript_application_graph");
  });

  it.each([
    "parse_javascript_source",
    "build_javascript_application_graph",
    "seal_javascript_application_graph",
    "build_javascript_semantic_graph",
    "seal_javascript_semantic_graph",
    "validate_javascript_application_result",
    "create_javascript_application_evidence",
    "seal_javascript_application_result",
    "validate_javascript_application_evidence",
    "hash_javascript_application_evidence",
  ])("rejects cancellation scheduled during %s", async (phase) => {
    const root = await createTestTempDirectory("rea-js-cancel-phase-");
    await writeFile(
      join(root, "main.js"),
      "export function inspect(value) { return JSON.stringify(value); }\n",
    );
    const controller = new AbortController();
    let requested = false;
    const terminal: string[] = [];
    const result = await analyzeJavaScriptApplication(
      { input_path: root, format: "directory" },
      {
        signal: controller.signal,
        progress: {
          async report(event) {
            if (event.terminal) terminal.push(event.phase);
            if (event.phase === phase) {
              requested = true;
              setImmediate(() => controller.abort());
            }
          },
        },
      },
    );
    expect(requested).toBe(true);
    if (result.ok) throw new Error("Cancelled analysis must return a failure");
    const failure = projectAnalysisError(result.error);
    expect(failure).toMatchObject({ code: "cancelled" });
    if (phase === "parse_javascript_source")
      expect(failure).toMatchObject({
        details: {
          operation: "analyze_javascript_application",
          cleanup: "complete",
          partial_observation: {
            normalized_result: {
              statistics: { relevant_files: 1, parse_failures: 0 },
            },
          },
        },
      });
    expect(terminal).toEqual([]);
  });

  it("honors cancellation observed during the terminal publication race", async () => {
    const root = await createTestTempDirectory("rea-js-cancel-terminal-");
    await writeFile(join(root, "main.js"), "export const value = 1;\n");
    const controller = new AbortController();
    const result = await analyzeJavaScriptApplication(
      { input_path: root, format: "directory" },
      {
        signal: controller.signal,
        progress: {
          async report(event) {
            if (event.terminal) controller.abort();
          },
        },
      },
    );
    if (result.ok) throw new Error("Expected cancellation before admission");
    expect(projectAnalysisError(result.error)).toMatchObject({
      details: { reason: "cancelled" },
    });
  });
});