import assert from "node:assert/strict";
import * as vscode from "vscode";
import { control, spawnCounter, startImage } from "./server";
import { ImageSourceTree, RevisionDocuments } from "../src/sourceProvider";

export async function run(): Promise<void> {
  const image = await startImage();
  const folders = vscode.workspace.workspaceFolders?.map((folder) => folder.uri.toString());
  try {
    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);
    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.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);
    await vscode.commands.executeCommand("runa.stop", selection);
    await vscode.commands.executeCommand("runa.inspect", selection);
    assert.notEqual(JSON.parse(controlled.getText()).actor.status.status, "stopped");
    const controlStopped = documentChanged(controlled, (text) =>
      text.includes('"status": "stopped"'),
    );
    // Graceful stop completes only when the scheduler advances.
    await vscode.commands.executeCommand("runa.tick", 10);
    await controlStopped;
    assert.equal(JSON.parse(controlled.getText()).actor.status.status, "stopped");
    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);
    const controlKilled = documentChanged(controlled, (text) =>
      text.includes('"status": "stopped"'),
    );
    await vscode.commands.executeCommand("runa.kill", selection);
    await controlKilled;
    const controlReloaded = documentChanged(
      controlled,
      (text) => JSON.parse(text).actor.incarnation === 3,
    );
    await vscode.commands.executeCommand("runa.restart", selection);
    await controlReloaded;
    await vscode.commands.executeCommand("runa.reload", selection);
    await vscode.commands.executeCommand("runa.tick", 10);
    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: 4, 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/);
    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,
  );
  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));
}

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("Actor inspector did not refresh"));
    }, 5000);
  });
}