import assert from "node:assert/strict";
import * as vscode from "vscode";
import { control, spawnCounter, startImage } from "./server";
import { ImageSourceTree, RevisionDocuments } from "../src/sourceProvider";
import { actorFileUri } from "../src/actorFiles";
import type { activate } from "../src/extension";
import { SourceDiagnostics } from "../src/diagnostics";
import { SourceDiagnostic } from "../src/protocol";

export async function run(): Promise<void> {
  const image = await startImage();
  const folders = vscode.workspace.workspaceFolders?.map((folder) => folder.uri.toString());
  try {
    const extension = vscode.extensions.all.find(
      (candidate) => candidate.packageJSON.name === "runa",
    );
    assert.ok(extension);
    const contributions = extension.packageJSON.contributes;
    assert.ok(
      contributions.viewsContainers.activitybar.some(
        (container: { id: string }) => container.id === "runa",
      ),
    );
    assert.deepEqual(
      contributions.views.runa.map((view: { id: string }) => view.id),
      ["runa.sources", "runa.actors"],
    );
    assert.equal(contributions.views.explorer, undefined);
    assert.ok(
      contributions.menus["view/title"].some(
        (item: { command: string; when: string }) =>
          item.command === "runa.tick" && item.when.includes("runa.actors"),
      ),
    );
    await vscode.commands.executeCommand("workbench.view.extension.runa");
    await vscode.commands.executeCommand("runa.connect", image.address);
    assert.ok(!(await vscode.commands.getCommands(true)).includes("runa.addSourceFolder"));
    assert.deepEqual(
      vscode.workspace.workspaceFolders?.map((folder) => folder.uri.toString()),
      folders,
    );
    await editSources(image.address);
    await checkSourceDiagnostics(image.address);
    await editActorFiles(image.address);
    const spawned = await vscode.commands.executeCommand<unknown>("runa.spawn", {
      path: "actors/counter",
      state: "5",
    });
    assert.equal(typeof spawned, "string");
    const selection = { actor_ref: String(spawned) };
    await vscode.commands.executeCommand("runa.copyActorReference", selection);
    assert.equal(await vscode.env.clipboard.readText(), spawned);
    await vscode.commands.executeCommand("runa.inspect", selection);
    const controlled = vscode.window.activeTextEditor?.document;
    assert.ok(controlled);
    await vscode.commands.executeCommand("runa.send", selection, '{"op":"add","value":7}');
    const controlPaused = documentChanged(controlled, (text) =>
      text.includes('"status": "paused"'),
    );
    await vscode.commands.executeCommand("runa.pause", selection);
    await vscode.commands.executeCommand("runa.tick", 100);
    await controlPaused;
    let snapshot = JSON.parse(controlled.getText()).actor;
    assert.equal(snapshot.status.status, "paused");
    assert.equal(snapshot.state.data, 5);
    assert.equal(snapshot.queued.length, 1);
    const controlExecuted = documentChanged(
      controlled,
      (text) => JSON.parse(text).actor.state.data === 12,
    );
    await vscode.commands.executeCommand("runa.resume", selection);
    await vscode.commands.executeCommand("runa.tick", 100);
    await controlExecuted;
    snapshot = JSON.parse(controlled.getText()).actor;
    assert.equal(snapshot.state.data, 12);
    assert.equal(snapshot.queued.length, 0);
    const controlRestarted = documentChanged(
      controlled,
      (text) => JSON.parse(text).actor.incarnation === 2,
    );
    await vscode.commands.executeCommand("runa.restart", selection);
    await controlRestarted;
    snapshot = JSON.parse(controlled.getText()).actor;
    assert.equal(snapshot.incarnation, 2);
    assert.equal(snapshot.state.data, 12);
    await vscode.commands.executeCommand("runa.reload", selection);
    await vscode.commands.executeCommand("runa.tick", 10);
    await vscode.commands.executeCommand("runa.stop", selection);
    assert.equal(JSON.parse(controlled.getText()).removed, undefined);
    const controlStopped = documentChanged(controlled, (text) => JSON.parse(text).removed === true);
    await vscode.commands.executeCommand("runa.tick", 10);
    await controlStopped;
    assert.equal(
      (await vscode.workspace.fs.stat(controlled.uri)).permissions,
      vscode.FilePermission.Readonly,
    );
    const doomed = await vscode.commands.executeCommand<string>("runa.spawn", {
      path: "actors/counter",
      state: "0",
    });
    await vscode.commands.executeCommand("runa.inspect", { actor_ref: doomed });
    const killed = vscode.window.activeTextEditor?.document;
    assert.ok(killed);
    const controlKilled = documentChanged(killed, (text) => JSON.parse(text).removed === true);
    await vscode.commands.executeCommand("runa.kill", { actor_ref: doomed });
    await controlKilled;
    assert.equal(
      (await vscode.workspace.fs.stat(killed.uri)).permissions,
      vscode.FilePermission.Readonly,
    );
    const actorRef = await spawnCounter(image.address);
    await vscode.commands.executeCommand("runa.connect", image.address);
    await vscode.commands.executeCommand("runa.refresh");
    await vscode.commands.executeCommand("runa.inspect", { actor_ref: actorRef });
    let document = vscode.window.activeTextEditor?.document;
    assert.ok(document);
    assert.equal(document.uri.scheme, "runa");
    assert.equal(document.languageId, "json");
    assert.match(document.getText(), /9223372036854775807/);
    assert.match(document.getText(), /"connected": true/);
    const firstUri = document.uri.toString();
    const refreshed = documentChanged(document, (text) =>
      text.includes("queued from another client"),
    );
    assert.deepEqual(
      await control(image.address, {
        operation: "send",
        parameters: {
          actor_ref: actorRef,
          message: { type: "string", data: "queued from another client" },
        },
      }),
      { version: 5, request_id: "integration-control", result: { Ok: { kind: "acknowledged" } } },
    );
    await refreshed;
    assert.match(document.getText(), /queued from another client/);
    const paused = documentChanged(document, (text) => text.includes('"status": "paused"'));
    await control(image.address, {
      operation: "system",
      parameters: { actor_ref: actorRef, message: { kind: "pause" } },
    });
    await paused;
    const failed = documentChanged(document, (text) => text.includes('"status": "failed"'));
    await control(image.address, {
      operation: "system",
      parameters: { actor_ref: actorRef, message: { kind: "resume" } },
    });
    await control(image.address, {
      operation: "tick",
      parameters: { ticks: 100, instruction_budget: 10 },
    });
    await failed;
    const disconnected = documentChanged(document, (text) => text.includes('"connected": false'));
    await vscode.commands.executeCommand("runa.disconnect");
    await disconnected;
    assert.match(document.getText(), /"connected": false/);
    await vscode.commands.executeCommand("runa.connect", image.address);
    await vscode.commands.executeCommand("runa.inspect", { actor_ref: actorRef });
    document = vscode.window.activeTextEditor?.document;
    assert.ok(document);
    assert.notEqual(document.uri.toString(), firstUri);
    assert.match(document.getText(), /queued from another client/);
    const old = await vscode.workspace.openTextDocument(vscode.Uri.parse(firstUri));
    assert.match(old.getText(), /"connected": false/);
    assert.equal((await vscode.workspace.fs.stat(document.uri)).permissions, undefined);
    const updated = JSON.parse(document.getText());
    updated.actor.state = { type: "integer", data: 77 };
    updated.actor.reserved = null;
    updated.actor.queued = [
      {
        type: "record",
        data: { op: { type: "string", data: "add" }, value: { type: "integer", data: 2 } },
      },
    ];
    updated.actor.log_level = "warn";
    updated.actor.incarnation = 999;
    updated.connection.endpoint = "not the actual endpoint";
    const canonical = documentChanged(document, (text) => {
      const saved = JSON.parse(text);
      return (
        saved.actor.state.data === 77 &&
        saved.actor.incarnation !== 999 &&
        saved.actor.log_level === "warn" &&
        saved.connection.endpoint === image.address
      );
    });
    const edit = new vscode.WorkspaceEdit();
    edit.replace(
      document.uri,
      new vscode.Range(document.positionAt(0), document.positionAt(document.getText().length)),
      JSON.stringify(updated, null, 2),
    );
    assert.equal(await vscode.workspace.applyEdit(edit), true);
    const unsaved = document.getText();
    await vscode.commands.executeCommand("runa.refresh");
    assert.equal(document.getText(), unsaved, "refresh must preserve unsaved inspection edits");
    const window = vscode.window as { showErrorMessage: (...args: unknown[]) => unknown };
    const showError = window.showErrorMessage;
    const saveErrors: unknown[][] = [];
    window.showErrorMessage = async (...args: unknown[]) => {
      saveErrors.push(args);
      return undefined;
    };
    try {
      assert.equal(await document.save(), true);
      await canonical;
      assert.deepEqual(saveErrors, [], "successful inspection save must not report refresh errors");
      assert.equal(document.isDirty, false);
    } finally {
      window.showErrorMessage = showError;
    }
    const recovered = documentChanged(document, (text) => {
      const actor = JSON.parse(text).actor;
      return (
        actor.state.data === 79 && actor.log_level === "warn" && actor.status.status === "idle"
      );
    });
    await vscode.commands.executeCommand("runa.logLevel", { actor_ref: actorRef }, "warn");
    await vscode.commands.executeCommand("runa.restart", { actor_ref: actorRef });
    await vscode.commands.executeCommand("runa.tick", 100);
    await recovered;
    await vscode.commands.executeCommand("runa.inspect", { actor_ref: actorRef });
    const repaired = vscode.window.activeTextEditor?.document;
    assert.ok(repaired);
    assert.equal(JSON.parse(repaired.getText()).actor.state.data, 79, repaired.getText());
    assert.equal(JSON.parse(repaired.getText()).actor.log_level, "warn");
    assert.equal(JSON.parse(repaired.getText()).actor.status.status, "idle");
    assert.equal(
      (await vscode.workspace.fs.stat(repaired.uri)).permissions,
      vscode.FilePermission.Readonly,
    );
    await assert.rejects(async () => {
      await vscode.workspace.fs.writeFile(repaired.uri, Buffer.from(repaired.getText()));
    }, /paused or failed/);
    await checkDiagnosticRaces(image.address);
    console.log(
      "Runa extension host: spawn, send, system messages, ticks, inspection, automatic refresh, reconnect passed",
    );
  } finally {
    await vscode.commands.executeCommand("runa.disconnect");
    await image.stop();
  }
}

async function editSources(address: string): Promise<void> {
  const extension = vscode.extensions.all.find(
    (candidate) => candidate.packageJSON.name === "runa",
  );
  assert.ok(extension);
  const { sourceTree } = extension.exports as { sourceTree: ImageSourceTree };
  const [root] = sourceTree.getChildren();
  assert.ok(root);
  assert.equal(root.uri.toString(), `runa-image://${address}/source`);
  assert.deepEqual(await vscode.workspace.fs.readDirectory(root.uri), [
    ["actors", vscode.FileType.Directory],
  ]);
  const [directory] = sourceTree.getChildren(root);
  assert.ok(directory);
  assert.equal(directory.directory, true);
  const [file] = sourceTree.getChildren(directory);
  assert.ok(file);
  assert.equal(sourceTree.getTreeItem(file).contextValue, "runa.sourceFile");
  const actors = vscode.Uri.joinPath(root.uri, "actors");
  assert.deepEqual(await vscode.workspace.fs.readDirectory(actors), [
    ["counter.rn", vscode.FileType.File],
  ]);
  const uri = vscode.Uri.joinPath(actors, "counter.rn");
  const document = await vscode.workspace.openTextDocument(uri);
  await vscode.window.showTextDocument(document);
  const original = document.getText();
  assert.match(original, /pub fn handle\(ctx, state, sender, message\)/);

  const edited = "pub fn handle(ctx, state, sender, message) {\n    state + 2\n}\n";
  await replaceText(document, edited);
  const window = vscode.window as { showWarningMessage: (...args: unknown[]) => unknown };
  const warning = window.showWarningMessage;
  const prompts: unknown[][] = [];
  let answer: string | undefined;
  window.showWarningMessage = async (...args: unknown[]) => {
    prompts.push(args);
    return answer;
  };
  try {
    // Unsaved edits are never committed or spawned without an explicit save.
    assert.equal(await vscode.commands.executeCommand("runa.commitSource", uri), undefined);
    assert.equal(await vscode.commands.executeCommand("runa.spawnSource", uri), undefined);
    assert.equal(prompts.length, 2);
    assert.deepEqual(prompts[0]?.[1], { modal: true });
    assert.equal(document.isDirty, true);
    const unsaved = JSON.stringify(
      await control(address, { operation: "read_source", parameters: { path: "actors/counter" } }),
    );
    assert.ok(unsaved.includes(JSON.stringify(original)));
    assert.match(
      JSON.stringify(await control(address, { operation: "list_actors" })),
      /"data":\[\]/,
    );
    answer = "Save and Spawn";
    const saved = await vscode.commands.executeCommand<string>("runa.spawnSource", uri);
    assert.match(String(saved), /^[A-Za-z0-9_-]{21}$/);
    assert.equal(prompts.length, 3);
    assert.equal(document.isDirty, false, "the explicit choice saves before spawning");
  } finally {
    window.showWarningMessage = warning;
  }
  assert.equal(document.isDirty, false);
  assert.equal(document.isDirty, false);
  let reply = JSON.stringify(
    await control(address, { operation: "read_source", parameters: { path: "actors/counter" } }),
  );
  assert.ok(reply.includes(JSON.stringify(edited)), reply);
  reply = JSON.stringify(
    await control(address, { operation: "source_history", parameters: { path: "actors/counter" } }),
  );
  assert.match(reply, /"kind":"source_history","data":\[\]/);

  // Spawn context-menu actions receive the explorer URI and use the saved, uncommitted source.
  const nullActor = await vscode.commands.executeCommand<string>("runa.spawnSource", uri);
  assert.match(String(nullActor), /^[A-Za-z0-9_-]{21}$/);
  reply = JSON.stringify(
    await control(address, { operation: "inspect_actor", parameters: { actor_ref: nullActor } }),
  );
  assert.match(reply, /"state":\{"type":"null"\}/);
  const inputWindow = vscode.window as { showInputBox: (...args: unknown[]) => unknown };
  const originalInput = inputWindow.showInputBox;
  const inputs: unknown[][] = [];
  let stateAnswer: string | undefined;
  inputWindow.showInputBox = async (...args: unknown[]) => {
    inputs.push(args);
    return stateAnswer;
  };
  let actor: string | undefined;
  try {
    assert.equal(
      await vscode.commands.executeCommand("runa.spawnSourceWithState", file, [file]),
      undefined,
    );
    stateAnswer = "40";
    actor = await vscode.commands.executeCommand<string>("runa.spawnSourceWithState", file, [file]);
    assert.equal(inputs.length, 2, "context menus always prompt for state");
    assert.match(JSON.stringify(inputs[1]), /Initial state for actors\/counter/);
  } finally {
    inputWindow.showInputBox = originalInput;
  }
  assert.match(String(actor), /^[A-Za-z0-9_-]{21}$/);
  await vscode.commands.executeCommand("runa.send", { actor_ref: actor }, "null");
  await vscode.commands.executeCommand("runa.tick", 10);
  reply = JSON.stringify(
    await control(address, { operation: "inspect_actor", parameters: { actor_ref: actor } }),
  );
  assert.match(reply, /"state":\{"type":"integer","data":42\}/);

  const revision = await vscode.commands.executeCommand<string>("runa.commitSource", uri);
  assert.match(String(revision), /^[A-Za-z0-9]{1,64}$/);
  const opened = await vscode.commands.executeCommand<string>("runa.sourceHistory", uri, revision);
  const historical = vscode.window.activeTextEditor?.document;
  assert.ok(historical);
  assert.equal(historical.uri.toString(), opened);
  assert.equal(historical.uri.scheme, "runa-source");
  assert.ok(historical.uri.path.endsWith(`/source/actors/counter@${revision}.rn`));
  assert.equal(historical.getText(), edited);
  await vscode.commands.executeCommand("type", { text: "// cannot edit\n" });
  assert.equal(historical.getText(), edited);

  // Saving again changes only the working source; history is unchanged.
  await vscode.window.showTextDocument(document);
  await replaceText(document, original);
  assert.ok(await document.save());
  assert.equal(historical.getText(), edited);

  prompts.length = 0;
  answer = undefined;
  window.showWarningMessage = async (...args: unknown[]) => {
    prompts.push(args);
    return answer;
  };
  try {
    await vscode.commands.executeCommand("runa.rollbackSource", uri, revision);
    assert.equal(prompts.length, 1);
    assert.deepEqual(prompts[0]?.[1], { modal: true });
    assert.equal(document.getText(), original, "cancelled rollback changes nothing");
    answer = "Roll Back";
    const reloaded = documentChanged(document, (text) => text === edited);
    await vscode.commands.executeCommand("runa.rollbackSource", uri, revision);
    await reloaded;
  } finally {
    window.showWarningMessage = warning;
  }
  assert.equal(document.isDirty, false);
  reply = JSON.stringify(
    await control(address, { operation: "source_history", parameters: { path: "actors/counter" } }),
  );
  assert.equal((reply.match(/"revision"/g) ?? []).length, 1);

  // Saves from another client reload clean editors through image notifications.
  const current = JSON.parse(
    JSON.stringify(
      await control(address, { operation: "read_source", parameters: { path: "actors/counter" } }),
    ),
  ).result.Ok.data;
  const external = documentChanged(document, (text) => text === original);
  await control(address, {
    operation: "write_source",
    parameters: { path: "actors/counter", expected_source_id: current.source_id, source: original },
  });
  await external;

  // Revision documents stay isolated per connection session.
  await vscode.commands.executeCommand("runa.disconnect");
  assert.equal(historical.getText(), edited);
  await vscode.commands.executeCommand("runa.connect", address);
  assert.equal(
    vscode.workspace.workspaceFolders?.filter((candidate) => candidate.uri.scheme === "runa-image")
      .length ?? 0,
    0,
  );
  const reopened = await vscode.commands.executeCommand<string>(
    "runa.sourceHistory",
    uri,
    revision,
  );
  assert.ok(reopened);
  assert.notEqual(reopened, opened);
  assert.equal(vscode.window.activeTextEditor?.document.getText(), edited);
  const revisions = new RevisionDocuments();
  try {
    const cached = revisions.set(1, "actors/counter", "abc", edited);
    assert.equal(revisions.provideTextDocumentContent(cached), edited);
    assert.notEqual(
      revisions.set(2, "actors/counter", "abc", original).toString(),
      cached.toString(),
    );
    assert.throws(() => revisions.set(1, "actors/counter", "abc", original), /Immutable/);
    revisions.remove(cached);
    assert.throws(() => revisions.provideTextDocumentContent(cached), /no longer cached/);
  } finally {
    revisions.dispose();
  }
  console.log(
    "Runa sources: automatic tree, state input, save, uncommitted spawn, commit, history, rollback, session isolation passed",
  );
}

async function replaceText(document: vscode.TextDocument, text: string): Promise<void> {
  const edit = new vscode.WorkspaceEdit();
  edit.replace(
    document.uri,
    new vscode.Range(document.positionAt(0), document.positionAt(document.getText().length)),
    text,
  );
  assert.ok(await vscode.workspace.applyEdit(edit));
}

async function checkSourceDiagnostics(address: string): Promise<void> {
  await vscode.commands.executeCommand("runa.newSource", undefined, "tests/diagnostics.rn");
  const document = vscode.window.activeTextEditor?.document;
  assert.ok(document);
  const original = document.getText();
  const invalid = 'pub fn handle(ctx, state, sender, message) {\r\n    "é😀" + missing\r\n}';
  await replaceText(document, invalid);
  await diagnosticsChanged(document.uri, (diagnostics) =>
    diagnostics.some((diagnostic) => diagnostic.severity === vscode.DiagnosticSeverity.Error),
  );
  const error = vscode.languages
    .getDiagnostics(document.uri)
    .find((diagnostic) => diagnostic.severity === vscode.DiagnosticSeverity.Error);
  assert.ok(error);
  assert.equal(error.source, "Rune");
  assert.equal(error.range.start.line, 1);
  assert.equal(error.range.start.character, 12);
  assert.equal(error.range.end.character, 19);
  assert.equal(document.isDirty, true);
  assert.equal(
    Buffer.from(await vscode.workspace.fs.readFile(document.uri)).toString(),
    original,
    "validation does not save unsaved source",
  );
  await replaceText(document, "pub fn handle(ctx, state, sender, message) { `hello`; state }");
  await diagnosticsChanged(
    document.uri,
    (diagnostics) =>
      diagnostics.some((diagnostic) => diagnostic.severity === vscode.DiagnosticSeverity.Warning) &&
      diagnostics.every((diagnostic) => diagnostic.severity !== vscode.DiagnosticSeverity.Error),
  );
  await replaceText(document, original);
  await diagnosticsChanged(document.uri, (diagnostics) => diagnostics.length === 0);
  assert.ok(await document.save());

  const ref = await vscode.commands.executeCommand<string>("runa.spawn", {
    path: "tests/diagnostics",
    state: "0",
  });
  assert.ok(ref);
  const selection = { actor_ref: ref };
  await vscode.commands.executeCommand("runa.editBehavior", selection);
  const behavior = vscode.window.activeTextEditor?.document;
  assert.ok(behavior);
  await replaceText(behavior, invalid);
  await diagnosticsChanged(behavior.uri, (diagnostics) =>
    diagnostics.some((diagnostic) => diagnostic.severity === vscode.DiagnosticSeverity.Error),
  );
  assert.equal(
    vscode.languages.getDiagnostics(document.uri).length,
    0,
    "temporary diagnostics belong to the actor document",
  );
  await assert.rejects(
    async () => vscode.workspace.fs.writeFile(behavior.uri, Buffer.from(invalid)),
    /Rune compilation failed/,
  );
  const inspection = JSON.stringify(
    await control(address, { operation: "inspect_actor", parameters: { actor_ref: ref } }),
  );
  assert.match(inspection, /"temporary_behavior":false/);
  await replaceText(behavior, original);
  await diagnosticsChanged(behavior.uri, (diagnostics) => diagnostics.length === 0);
  assert.ok(await behavior.save());
  // Rapid successive edits cannot leave diagnostics for an older document version.
  await replaceText(behavior, invalid);
  await replaceText(behavior, original);
  await new Promise((resolve) => setTimeout(resolve, 600));
  assert.equal(vscode.languages.getDiagnostics(behavior.uri).length, 0);
  await replaceText(behavior, invalid);
  await diagnosticsChanged(behavior.uri, (diagnostics) => diagnostics.length > 0);
  await vscode.commands.executeCommand("runa.disconnect");
  assert.equal(vscode.languages.getDiagnostics(behavior.uri).length, 0);
  await vscode.commands.executeCommand("runa.connect", address);
  assert.equal(
    vscode.languages.getDiagnostics(behavior.uri).length,
    0,
    "old-session actor documents are not validated",
  );
  await replaceText(behavior, original);
  await vscode.commands.executeCommand("runa.kill", selection);
  console.log(
    "Runa compile diagnostics: unsaved source, warnings, UTF-16 locations, temporary isolation and reconnect passed",
  );
}

function diagnosticsChanged(
  uri: vscode.Uri,
  expected: (diagnostics: readonly vscode.Diagnostic[]) => boolean,
): Promise<void> {
  if (expected(vscode.languages.getDiagnostics(uri))) return Promise.resolve();
  return new Promise((resolve, reject) => {
    const subscription = vscode.languages.onDidChangeDiagnostics((event) => {
      if (
        event.uris.some((changed) => changed.toString() === uri.toString()) &&
        expected(vscode.languages.getDiagnostics(uri))
      ) {
        clearTimeout(timeout);
        subscription.dispose();
        resolve();
      }
    });
    const timeout = setTimeout(() => {
      subscription.dispose();
      reject(
        new Error(
          `Diagnostics did not update for ${uri.toString()}: ${JSON.stringify(vscode.languages.getDiagnostics(uri))}`,
        ),
      );
    }, 5000);
  });
}

async function checkDiagnosticRaces(address: string): Promise<void> {
  await vscode.commands.executeCommand("runa.newSource", undefined, "tests/races.rn");
  const document = vscode.window.activeTextEditor?.document;
  assert.ok(document);
  const original = document.getText();
  await vscode.commands.executeCommand("runa.disconnect");
  type Check = { source: string; resolve: (diagnostics: SourceDiagnostic[]) => void };
  const checks: Check[] = [];
  let started: (() => void) | undefined;
  const client = {
    checkSource: (source: string) =>
      new Promise<SourceDiagnostic[]>((resolve) => {
        checks.push({ source, resolve });
        started?.();
      }),
  };
  let connected = true;
  const errors: unknown[] = [];
  const diagnostics = new SourceDiagnostics(
    () => (connected ? { client, endpoint: address, session: 100 } : undefined),
    (error) => errors.push(error),
  );
  const nextCheck = () =>
    new Promise<void>((resolve, reject) => {
      const timer = setTimeout(
        () => reject(new Error("Diagnostic validation did not start")),
        5000,
      );
      started = () => {
        clearTimeout(timer);
        started = undefined;
        resolve();
      };
    });
  const error: SourceDiagnostic = { severity: "error", message: "old response", range: null };
  const observed: vscode.Diagnostic[] = [];
  const subscription = vscode.languages.onDidChangeDiagnostics(() =>
    observed.push(...vscode.languages.getDiagnostics(document.uri)),
  );
  try {
    let checking = nextCheck();
    await replaceText(document, "pub fn broken( {");
    await checking;
    assert.equal(checks.length, 1);
    checking = nextCheck();
    await replaceText(document, original);
    checks[0]!.resolve([error]);
    await checking;
    assert.equal(checks[1]?.source, original);
    checks[1]!.resolve([]);
    await new Promise((resolve) => setTimeout(resolve, 50));
    assert.ok(
      observed.every((diagnostic) => diagnostic.message !== "old response"),
      "an in-flight result cannot annotate a newer document",
    );
    checking = nextCheck();
    await replaceText(document, "pub fn broken( {");
    await checking;
    diagnostics.clear();
    connected = false;
    checks[2]!.resolve([error]);
    await new Promise((resolve) => setTimeout(resolve, 50));
    assert.equal(
      vscode.languages.getDiagnostics(document.uri).length,
      0,
      "an in-flight result cannot repopulate disconnected diagnostics",
    );
    assert.deepEqual(errors, []);
  } finally {
    subscription.dispose();
    diagnostics.dispose();
    for (const check of checks) check.resolve([]);
    await replaceText(document, original);
  }
  console.log(
    "Runa compile diagnostics: stale in-flight version and disconnect responses discarded",
  );
}

async function editActorFiles(address: string): Promise<void> {
  const extension = vscode.extensions.all.find(
    (candidate) => candidate.packageJSON.name === "runa",
  );
  assert.ok(extension);
  const { actorTree, sourceTree } = extension.exports as ReturnType<typeof activate>;
  const inputWindow = vscode.window as { showInputBox: (...args: unknown[]) => unknown };
  const input = inputWindow.showInputBox;
  const [root] = sourceTree.getChildren();
  assert.ok(root);
  inputWindow.showInputBox = async () => "tests/files.rn";
  try {
    await vscode.commands.executeCommand("runa.newSource", root, [root]);
  } finally {
    inputWindow.showInputBox = input;
  }
  const sourceDocument = vscode.window.activeTextEditor?.document;
  assert.ok(sourceDocument);
  const original =
    'pub fn handle(ctx, state, sender, message) { ctx.info("original"); state + message }\n';
  await replaceText(sourceDocument, original);
  assert.ok(await sourceDocument.save());
  const ref = await vscode.commands.executeCommand<string>("runa.spawn", {
    path: "tests/files",
    state: "1",
  });
  assert.ok(ref);
  const selected = { actor_ref: ref };
  await vscode.commands.executeCommand("runa.refresh");
  const parent = actorTree.getChildren().find((node) => node.actor_ref === ref);
  assert.ok(parent);
  assert.equal(
    actorTree.getTreeItem(parent).collapsibleState,
    vscode.TreeItemCollapsibleState.Collapsed,
  );
  assert.deepEqual(
    actorTree.getChildren(parent).map((node) => ("file" in node ? node.file : "")),
    ["meta.json", "config.json", "state.json", "mailbox.json", "actor.log"],
  );
  const session = actorTree.session;
  const uri = (name: string) => actorFileUri(session, ref, name);
  const meta = await vscode.workspace.openTextDocument(uri("meta.json"));
  await vscode.window.showTextDocument(meta, { preview: false });
  assert.equal(JSON.parse(meta.getText()).behavior_path, "tests/files");
  assert.equal(JSON.parse(meta.getText()).state, undefined);
  assert.equal(
    (await vscode.workspace.fs.stat(meta.uri)).permissions,
    vscode.FilePermission.Readonly,
  );
  assert.equal(
    (await vscode.workspace.fs.stat(uri("state.json"))).permissions,
    vscode.FilePermission.Readonly,
  );
  await assert.rejects(
    async () => vscode.workspace.fs.writeFile(meta.uri, Buffer.from("{}")),
    /read-only/,
  );
  const config = await vscode.workspace.openTextDocument(uri("config.json"));
  await vscode.window.showTextDocument(config);
  await replaceText(config, '{"log_level":"trace"}');
  assert.ok(await config.save(), "configuration is writable while running");
  await vscode.commands.executeCommand("runa.pause", selected);
  await vscode.commands.executeCommand("runa.refresh");
  assert.equal((await vscode.workspace.fs.stat(uri("state.json"))).permissions, undefined);
  const state = await vscode.workspace.openTextDocument(uri("state.json"));
  assert.equal(state.getText().trim(), "1");
  await vscode.workspace.fs.writeFile(
    state.uri,
    Buffer.from('{"nested":[9223372036854775807,{"value":true}]}'),
  );
  const prettyState = Buffer.from(await vscode.workspace.fs.readFile(state.uri)).toString();
  assert.equal(
    prettyState,
    '{\n  "nested": [\n    9223372036854775807,\n    {\n      "value": true\n    }\n  ]\n}\n',
  );
  await vscode.window.showTextDocument(state, { preview: false });
  await replaceText(state, "40");
  assert.ok(await state.save());
  const mailbox = await vscode.workspace.openTextDocument(uri("mailbox.json"));
  await vscode.window.showTextDocument(mailbox);
  await replaceText(mailbox, '{"reserved":[2],"queued":[3]}');
  assert.ok(await mailbox.save());
  assert.equal(
    Buffer.from(await vscode.workspace.fs.readFile(mailbox.uri)).toString(),
    '{\n  "reserved": [\n    2\n  ],\n  "queued": [\n    3\n  ]\n}\n',
  );
  await assert.rejects(
    async () =>
      vscode.workspace.fs.writeFile(mailbox.uri, Buffer.from('{"reserved":[1,2],"queued":[]}')),
    /zero or one/,
  );
  const executed = documentChanged(state, (text) => text.trim() === "45");
  await vscode.commands.executeCommand("runa.restart", selected);
  await vscode.commands.executeCommand("runa.tick", 20);
  await executed;
  const log = await vscode.workspace.openTextDocument(uri("actor.log"));
  await vscode.window.showTextDocument(log, { preview: false });
  assert.equal(log.languageId, "log");
  assert.match(log.getText(), new RegExp(`^<134>1 - - runa ${ref} \\d+ - \\[INFO\\] original\\n`));
  assert.equal(
    (await vscode.workspace.fs.stat(log.uri)).permissions,
    vscode.FilePermission.Readonly,
  );

  const working = original.replace("state + message", "state + message * 10");
  await vscode.workspace.fs.writeFile(sourceDocument.uri, Buffer.from(working));
  await vscode.commands.executeCommand("runa.editBehavior", selected);
  const behavior = vscode.window.activeTextEditor?.document;
  assert.ok(behavior);
  assert.equal(behavior.uri.toString(), uri("behavior").toString());
  assert.equal(
    behavior.getText(),
    original,
    "edit starts from loaded behavior, not current working source",
  );
  const temporary = original
    .replace('"original"', '"temporary"')
    .replace("state + message", "state + message * 100");
  await replaceText(behavior, temporary);
  assert.ok(await behavior.save());
  assert.equal(
    Buffer.from(await vscode.workspace.fs.readFile(sourceDocument.uri)).toString(),
    working,
  );
  await vscode.commands.executeCommand("runa.editBehavior", selected);
  assert.equal(vscode.window.activeTextEditor?.document.uri.toString(), behavior.uri.toString());
  await vscode.commands.executeCommand("runa.refresh");
  const withTemporary = actorTree.getChildren().find((node) => node.actor_ref === ref);
  assert.ok(withTemporary);
  assert.ok(
    actorTree.getChildren(withTemporary).some((node) => "file" in node && node.file === "behavior"),
  );
  const tempExecuted = documentChanged(state, (text) => text.trim() === "145");
  const logged = documentChanged(log, (text) => text.includes("[INFO] temporary"));
  await vscode.commands.executeCommand("runa.send", selected, "1");
  await vscode.commands.executeCommand("runa.tick", 20);
  await tempExecuted;
  await logged;

  const window = vscode.window as { showWarningMessage: (...args: unknown[]) => unknown };
  const warning = window.showWarningMessage;
  let answer: string | undefined;
  window.showWarningMessage = async () => answer;
  const renamed = vscode.Uri.from({
    scheme: "runa-image",
    authority: address,
    path: "/source/moved/files.rn",
  });
  try {
    await vscode.commands.executeCommand("runa.updateBehavior", selected);
    assert.equal(
      Buffer.from(await vscode.workspace.fs.readFile(sourceDocument.uri)).toString(),
      working,
    );
    answer = "Update Behavior";
    await vscode.commands.executeCommand("runa.updateBehavior", selected);
    assert.equal(
      Buffer.from(await vscode.workspace.fs.readFile(sourceDocument.uri)).toString(),
      temporary,
    );
    answer = undefined;
    await assert.rejects(
      async () => vscode.workspace.fs.rename(sourceDocument.uri, renamed),
      /[Cc]ancel/,
    );
    assert.equal(
      Buffer.from(await vscode.workspace.fs.readFile(sourceDocument.uri)).toString(),
      temporary,
    );
    answer = "Rename and Update Actors";
    const renamedMeta = documentChanged(
      meta,
      (text) => JSON.parse(text).behavior_path === "moved/files",
    );
    inputWindow.showInputBox = async () => "moved/files.rn";
    try {
      await vscode.commands.executeCommand("runa.renameSource", { uri: sourceDocument.uri }, [
        { uri: sourceDocument.uri },
      ]);
    } finally {
      inputWindow.showInputBox = input;
    }
    await renamedMeta;
    await vscode.commands.executeCommand("runa.goToBehavior", selected);
    assert.equal(vscode.window.activeTextEditor?.document.uri.toString(), renamed.toString());
    await assert.rejects(async () => vscode.workspace.fs.delete(renamed), /stop the actors first/);
    await vscode.commands.executeCommand("runa.reload", selected);
    await vscode.commands.executeCommand("runa.tick", 20);
    await vscode.commands.executeCommand("runa.refresh");
    const reloaded = actorTree.getChildren().find((node) => node.actor_ref === ref);
    assert.ok(reloaded);
    assert.ok(
      !actorTree.getChildren(reloaded).some((node) => "file" in node && node.file === "behavior"),
    );
    await vscode.commands.executeCommand("runa.kill", selected);
    await vscode.commands.executeCommand("runa.refresh");
    assert.match(
      Buffer.from(await vscode.workspace.fs.readFile(log.uri)).toString(),
      /\[INFO\] temporary/,
    );
    assert.equal(
      JSON.parse(Buffer.from(await vscode.workspace.fs.readFile(meta.uri)).toString()).removed,
      true,
    );
    await vscode.workspace.fs.delete(renamed);
    assert.equal(
      (await vscode.workspace.fs.stat(state.uri)).permissions,
      vscode.FilePermission.Readonly,
    );
  } finally {
    window.showWarningMessage = warning;
  }
  console.log(
    "Runa actor directories, live config, natural state/mailbox edits, logs, temporary behaviors and source operations passed",
  );
}

function documentChanged(
  document: vscode.TextDocument,
  expected: (text: string) => boolean,
): Promise<void> {
  return new Promise((resolve, reject) => {
    const subscription = vscode.workspace.onDidChangeTextDocument((event) => {
      if (
        event.document.uri.toString() === document.uri.toString() &&
        expected(event.document.getText())
      ) {
        clearTimeout(timeout);
        subscription.dispose();
        resolve();
      }
    });
    const timeout = setTimeout(() => {
      subscription.dispose();
      reject(
        new Error(
          `Document did not refresh: ${document.uri.toString()} (closed=${document.isClosed}): ${document.getText()}`,
        ),
      );
    }, 5000);
  });
}