import assert from 'node:assert/strict';
import path from 'node:path';
import * as vscode from 'vscode';

const EXTENSION_ID = 'root-at-skic.archify-vscode-ext';

function workspaceFile(name: string): vscode.Uri {
  const folder = vscode.workspace.workspaceFolders?.[0];
  assert.ok(folder, 'a workspace folder is open');
  return vscode.Uri.joinPath(folder.uri, name);
}

async function waitFor<T>(what: string, probe: () => T | undefined | false, timeoutMs = 20_000): Promise<T> {
  const start = Date.now();
  for (;;) {
    const value = probe();
    if (value) return value;
    if (Date.now() - start > timeoutMs) throw new Error(`Timed out waiting for ${what}`);
    await new Promise((resolve) => setTimeout(resolve, 200));
  }
}

function webviewTabs(viewTypeSuffix: string): vscode.Tab[] {
  return vscode.window.tabGroups.all
    .flatMap((group) => group.tabs)
    .filter((tab) =>
      (tab.input instanceof vscode.TabInputWebview && tab.input.viewType.endsWith(viewTypeSuffix)) ||
      (tab.input instanceof vscode.TabInputCustom && tab.input.viewType === viewTypeSuffix));
}

async function check(name: string, body: () => Promise<void>): Promise<void> {
  try {
    await body();
    console.log(`  ✔ ${name}`);
  } catch (error) {
    console.log(`  ✖ ${name}\n    ${error instanceof Error ? error.stack ?? error.message : String(error)}`);
    throw error;
  }
}

export async function run(): Promise<void> {
  console.log('Archify extension integration suite');

  await check('activates on a diagram source and sets the context key', async () => {
    const doc = await vscode.workspace.openTextDocument(workspaceFile('production-deployment.architecture.json'));
    await vscode.window.showTextDocument(doc);
    const extension = vscode.extensions.getExtension(EXTENSION_ID);
    assert.ok(extension, 'extension is installed');
    await waitFor('activation', () => extension.isActive);
  });

  await check('clicking a .archify file opens the diagram, not the text', async () => {
    const uri = workspaceFile('web-platform.archify');
    await vscode.commands.executeCommand('vscode.open', uri);
    const tab = await waitFor('diagram editor tab', () =>
      vscode.window.tabGroups.all
        .flatMap((group) => group.tabs)
        .find((t) => t.input instanceof vscode.TabInputCustom && t.input.viewType === 'archify.diagram' && t.input.uri.toString() === uri.toString()),
    );
    assert.ok(tab.isActive, 'the diagram tab is active');
    assert.equal(vscode.window.activeTextEditor?.document.uri.toString() === uri.toString(), false, 'no text editor was opened for it');
  });

  await check('.archify files are YAML and Show Source opens the text beside the diagram', async () => {
    const uri = workspaceFile('web-platform.archify');
    await vscode.commands.executeCommand('archify.showSource');
    const editor = await waitFor('source text editor', () =>
      vscode.window.visibleTextEditors.find((e) => e.document.uri.toString() === uri.toString()),
    );
    assert.equal(editor.document.languageId, 'yaml');
    assert.match(editor.document.getText(), /^schema_version: 1/m);
  });

  await check('.archify validation problems are reported against the YAML', async () => {
    const good = await vscode.workspace.openTextDocument(workspaceFile('cache-miss.archify'));
    const broken = good.getText().replace(/^participants:/m, 'actors:');
    const target = workspaceFile('broken.archify');
    await vscode.workspace.fs.writeFile(target, new TextEncoder().encode(broken));
    const doc = await vscode.workspace.openTextDocument(target);
    await vscode.window.showTextDocument(doc);
    const diagnostics = await waitFor('archify diagnostics on broken.archify', () => {
      const found = vscode.languages.getDiagnostics(doc.uri).filter((d) => d.source === 'archify');
      return found.length > 0 && found;
    });
    assert.ok(diagnostics.some((d) => d.severity === vscode.DiagnosticSeverity.Error));
  });

  await check('.archify YAML syntax errors are reported at their line', async () => {
    const target = workspaceFile('syntax.archify');
    await vscode.workspace.fs.writeFile(target, new TextEncoder().encode('schema_version: 1\ndiagram_type: architecture\nmeta: [unclosed\n'));
    const doc = await vscode.workspace.openTextDocument(target);
    await vscode.window.showTextDocument(doc);
    const diagnostics = await waitFor('yaml syntax diagnostics', () => {
      const found = vscode.languages.getDiagnostics(doc.uri).filter((d) => d.source === 'archify' && d.message.startsWith('YAML:'));
      return found.length > 0 && found;
    });
    assert.ok(diagnostics[0].range.start.line >= 2, `reported on line ${diagnostics[0].range.start.line + 1}`);
  });

  await check('Archify | New Diagram creates a .archify file from a template and opens the diagram', async () => {
    // Menus show the bare title, so it must name Archify by itself.
    const commands = vscode.extensions.getExtension(EXTENSION_ID)?.packageJSON.contributes.commands as { command: string; title: string; category?: string }[];
    const newDiagram = commands.find((item) => item.command === 'archify.newDiagram');
    assert.equal(newDiagram?.title, 'Archify | New Diagram…');
    assert.equal(newDiagram?.category, undefined);
    const folder = workspaceFile('.');
    // Stub the template pick and the name prompt; check the name validation on the way.
    const window = vscode.window as unknown as Record<string, unknown>;
    const originalPick = window.showQuickPick;
    const originalInput = window.showInputBox;
    let existingNameMessage: unknown;
    window.showQuickPick = async (items: readonly { label: string }[]) => (await items).find((item) => item.label === 'Everyday Plan');
    window.showInputBox = async (options: vscode.InputBoxOptions) => {
      existingNameMessage = await options.validateInput?.('web-platform');
      return 'summer-plan';
    };
    try {
      await vscode.commands.executeCommand('archify.newDiagram', folder);
    } finally {
      window.showQuickPick = originalPick;
      window.showInputBox = originalInput;
    }
    assert.match(String(existingNameMessage), /already exists/);
    const uri = vscode.Uri.joinPath(folder, 'summer-plan.archify');
    const text = new TextDecoder().decode(await vscode.workspace.fs.readFile(uri));
    assert.match(text, /^diagram_type: workflow$/m);
    assert.match(text, /^ {2}title: Summer plan$/m);
    assert.match(text, /^ {2}output: summer-plan\.html$/m);
    await waitFor('diagram editor for the new file', () =>
      webviewTabs('archify.diagram').some((tab) => tab.input instanceof vscode.TabInputCustom && tab.input.uri.toString() === uri.toString()),
    );
  });

  await check('suggests brand IDs after brand: in .archify files', async () => {
    const target = workspaceFile('brands.archify');
    const text = [
      'schema_version: 1',
      'diagram_type: architecture',
      'meta:',
      '  title: Brands',
      'components:',
      '  - id: db',
      '    type: database',
      '    label: DB',
      '    brand: ',
      '  - id: bus',
      '    type: messagebus',
      '    label: Bus',
      '    brand: kafka',
      '',
    ].join('\n');
    await vscode.workspace.fs.writeFile(target, new TextEncoder().encode(text));
    const doc = await vscode.workspace.openTextDocument(target);
    const labels = async (line: number) => {
      const list = await vscode.commands.executeCommand<vscode.CompletionList>(
        'vscode.executeCompletionItemProvider',
        doc.uri,
        new vscode.Position(line, doc.lineAt(line).text.length),
      );
      return list.items.map((item) => (typeof item.label === 'string' ? item.label : item.label.label));
    };
    const empty = await labels(8);
    assert.ok(empty.includes('postgresql') && empty.includes('redis'), 'brand IDs offered after "brand: "');
    const kafka = await labels(12);
    assert.ok(kafka.includes('apache-kafka'), 'the alias "kafka" finds apache-kafka');
    assert.equal((await labels(7)).includes('postgresql'), false, 'nothing offered for other fields');
  });

  await check('an unknown brand is reported on its own line', async () => {
    const target = workspaceFile('unknown-brand.archify');
    const text = new TextDecoder().decode(await vscode.workspace.fs.readFile(workspaceFile('web-platform.archify')))
      .replace(/^( {2}- id: [^\n]+\n)/m, '$1    brand: not-a-brand\n');
    await vscode.workspace.fs.writeFile(target, new TextEncoder().encode(text));
    const doc = await vscode.workspace.openTextDocument(target);
    await vscode.window.showTextDocument(doc);
    const diagnostic = await waitFor('brand/unknown diagnostic', () =>
      vscode.languages.getDiagnostics(doc.uri).find((d) => d.source === 'archify' && d.code === 'brand/unknown'),
    );
    assert.match(doc.lineAt(diagnostic.range.start.line).text, /brand: not-a-brand/);
  });

  await check('opens a live preview beside the source', async () => {
    await vscode.commands.executeCommand('archify.showPreviewToSide', workspaceFile('production-deployment.architecture.json'));
    const tabs = await waitFor('preview tab', () => {
      const found = webviewTabs('archify.preview').filter((tab) => /production-deployment/.test(tab.label));
      return found.length > 0 && found;
    });
    assert.equal(tabs.length, 1);
    assert.match(tabs[0].label, /Preview production-deployment\.architecture\.json/);
  });

  await check('reports validation problems in the Problems panel with JSON ranges', async () => {
    const doc = await vscode.workspace.openTextDocument({
      language: 'json',
      content: JSON.stringify({ schema_version: 1, diagram_type: 'architecture', meta: { title: 'x' }, components: [{ id: 'a' }] }, null, 2),
    });
    await vscode.window.showTextDocument(doc);
    const diagnostics = await waitFor('archify diagnostics', () => {
      const found = vscode.languages.getDiagnostics(doc.uri).filter((d) => d.source === 'archify');
      return found.length > 0 && found;
    });
    const component = diagnostics.find((d) => /components\/0/.test(d.message));
    assert.ok(component, 'a diagnostic for /components/0');
    assert.equal(doc.getText(component.range), '{', 'range points at the component object');
    assert.equal(component.severity, vscode.DiagnosticSeverity.Error);
  });

  await check('clears problems once the document is fixed', async () => {
    const good = await vscode.workspace.openTextDocument(workspaceFile('event-stream.dataflow.json'));
    const doc = await vscode.workspace.openTextDocument({ language: 'json', content: good.getText() });
    await vscode.window.showTextDocument(doc);
    await new Promise((resolve) => setTimeout(resolve, 3000));
    const errors = vscode.languages.getDiagnostics(doc.uri).filter((d) => d.source === 'archify' && d.severity === vscode.DiagnosticSeverity.Error);
    assert.deepEqual(errors.map((d) => d.message), []);
  });

  await check('renders to an HTML file and opens it in the Archify viewer', async () => {
    const source = workspaceFile('cache-miss-request.sequence.json');
    const output = vscode.Uri.file(path.join(path.dirname(source.fsPath), 'cache-miss-request.sequence.html'));
    // Stub the save dialog and the follow-up notification.
    const window = vscode.window as unknown as Record<string, unknown>;
    const originalSave = window.showSaveDialog;
    const originalInfo = window.showInformationMessage;
    window.showSaveDialog = async () => output;
    window.showInformationMessage = async () => 'Open in Viewer';
    try {
      await vscode.commands.executeCommand('archify.renderToHtml', source);
    } finally {
      window.showSaveDialog = originalSave;
      window.showInformationMessage = originalInfo;
    }
    const html = new TextDecoder().decode(await vscode.workspace.fs.readFile(output));
    assert.match(html, /<meta name="generator" content="archify/);
    await waitFor('custom editor tab', () => webviewTabs('archify.htmlViewer').length > 0);
  });

  await check('source-backed diagram previews with the evidence fallback', async () => {
    const uri = workspaceFile('mco-runtime.architecture.json');
    await vscode.commands.executeCommand('archify.showPreview', uri);
    await waitFor('mco preview tab', () => webviewTabs('archify.preview').some((tab) => /mco-runtime/.test(tab.label)));
    const doc = await vscode.workspace.openTextDocument(uri);
    const diagnostics = await waitFor('evidence diagnostics', () => {
      const found = vscode.languages.getDiagnostics(doc.uri).filter((d) => d.source === 'archify');
      return found.length > 0 && found;
    });
    assert.ok(
      diagnostics.every((d) => d.severity !== vscode.DiagnosticSeverity.Error),
      'unverifiable evidence is a warning in fallback mode',
    );
  });

  // --- models: a folder with main.archify, registries and diagrams that use `ref`

  await check('a diagram inside a model resolves registry refs and validates clean', async () => {
    const uri = workspaceFile('model/0200-containers/online-shop.archify');
    const doc = await vscode.workspace.openTextDocument(uri);
    await vscode.window.showTextDocument(doc);
    // Validation runs through the Archify CLI; give it time, then expect no errors at all.
    await new Promise((resolve) => setTimeout(resolve, 6000));
    const errors = vscode.languages.getDiagnostics(doc.uri).filter((d) => d.source === 'archify' && d.severity === vscode.DiagnosticSeverity.Error);
    assert.deepEqual(errors.map((d) => d.message), []);
  });

  await check('an unknown ref is reported at its line', async () => {
    const target = workspaceFile('model/0300-components/ghost.archify');
    await vscode.workspace.fs.writeFile(
      target,
      new TextEncoder().encode('schema_version: 1\ndiagram_type: architecture\nmeta: { title: Ghost, output: ghost.html }\ncomponents:\n  - ref: ghost\n    pos: [40, 40]\n    size: [130, 60]\n'),
    );
    const doc = await vscode.workspace.openTextDocument(target);
    await vscode.window.showTextDocument(doc);
    const diagnostic = await waitFor('unknown ref diagnostic', () =>
      vscode.languages.getDiagnostics(doc.uri).find((d) => d.source === 'archify' && /Unknown element "ghost"/.test(d.message)),
    );
    assert.equal(diagnostic.range.start.line, 4, 'reported on the ref line');
  });

  await check('hover and completion on ref come from the registry', async () => {
    const uri = workspaceFile('model/0200-containers/online-shop.archify');
    const doc = await vscode.workspace.openTextDocument(uri);
    const line = doc.getText().split('\n').findIndex((l) => /ref: api$/.test(l));
    assert.ok(line >= 0, 'the containers diagram refers to api');
    const hovers = await vscode.commands.executeCommand<vscode.Hover[]>('vscode.executeHoverProvider', uri, new vscode.Position(line, 10));
    const text = hovers.flatMap((h) => h.contents).map((c) => (typeof c === 'string' ? c : c.value)).join('\n');
    assert.match(text, /Owns authentication/);
    const defs = await vscode.commands.executeCommand<vscode.Location[]>('vscode.executeDefinitionProvider', uri, new vscode.Position(line, 10));
    assert.match(defs[0].uri.path, /registry\/containers\.archify-registry$/);
    const completions = await vscode.commands.executeCommand<vscode.CompletionList>('vscode.executeCompletionItemProvider', uri, new vscode.Position(line, 9));
    const labels = completions.items.map((i) => (typeof i.label === 'string' ? i.label : i.label.label));
    assert.ok(labels.includes('api') && labels.includes('queue'), `completion lists registry elements: ${labels.join(', ')}`);
  });

  await check('a registry file reports duplicate ids and parse problems', async () => {
    const target = workspaceFile('model/registry/extra.archify-registry');
    await vscode.workspace.fs.writeFile(target, new TextEncoder().encode('schema_version: 1\nelements:\n  api:\n    type: backend\n    label: API again\n'));
    const doc = await vscode.workspace.openTextDocument(target);
    await vscode.window.showTextDocument(doc);
    const diagnostic = await waitFor('duplicate id diagnostic', () =>
      vscode.languages.getDiagnostics(doc.uri).find((d) => d.source === 'archify' && /defined twice/.test(d.message)),
    );
    assert.equal(diagnostic.range.start.line, 2);
    await vscode.workspace.fs.delete(target);
  });

  await check('main.archify opens as the model page and Open Model finds it from a diagram', async () => {
    const main = workspaceFile('model/main.archify');
    await vscode.commands.executeCommand('vscode.open', main);
    await waitFor('model page tab', () =>
      vscode.window.tabGroups.all.flatMap((g) => g.tabs).some((t) => t.input instanceof vscode.TabInputCustom && t.input.viewType === 'archify.diagram' && t.input.uri.toString() === main.toString()),
    );
    const diagram = workspaceFile('model/0100-context/online-shop.archify');
    await vscode.window.showTextDocument(await vscode.workspace.openTextDocument(diagram));
    await vscode.commands.executeCommand('archify.openModel', diagram);
    const tab = await waitFor('model page active', () =>
      vscode.window.tabGroups.all.flatMap((g) => g.tabs).find((t) => t.isActive && t.input instanceof vscode.TabInputCustom && t.input.uri.toString() === main.toString()),
    );
    assert.ok(tab);
  });

  await check('a .archify-registry file opens as the registry view and Show Source opens the YAML', async () => {
    const registry = workspaceFile('model/registry/people.archify-registry');
    await vscode.commands.executeCommand('vscode.open', registry);
    const tab = await waitFor('registry view tab', () =>
      vscode.window.tabGroups.all.flatMap((g) => g.tabs).find((t) => t.isActive && t.input instanceof vscode.TabInputCustom && t.input.viewType === 'archify.registry' && t.input.uri.toString() === registry.toString()),
    );
    assert.ok(tab);
    await vscode.commands.executeCommand('archify.showSource');
    const editor = await waitFor('registry text editor', () => vscode.window.visibleTextEditors.find((e) => e.document.uri.toString() === registry.toString()));
    assert.equal(editor.document.languageId, 'yaml');
  });

  await check('a .archify-decision file opens as the decision view; an unknown decision id is a problem in a diagram', async () => {
    const decision = workspaceFile('model/decisions/0002-queue-between-api-and-worker.archify-decision');
    await vscode.commands.executeCommand('vscode.open', decision);
    const tab = await waitFor('decision view tab', () =>
      vscode.window.tabGroups.all.flatMap((g) => g.tabs).find((t) => t.isActive && t.input instanceof vscode.TabInputCustom && t.input.viewType === 'archify.decision' && t.input.uri.toString() === decision.toString()),
    );
    assert.ok(tab);
    // A diagram that points at a decision nobody defines.
    const bad = workspaceFile('model/0300-components/bad-decision.archify');
    await vscode.workspace.fs.writeFile(bad, Buffer.from('schema_version: 1\ndiagram_type: architecture\nmeta:\n  title: Bad\n  output: bad.html\ndecisions: [nobody-decided]\ncomponents:\n  - ref: api\n    pos: [40, 60]\n    size: [130, 60]\n    decisions: [queue-between-api-and-worker]\n', 'utf8'));
    const doc = await vscode.workspace.openTextDocument(bad);
    await vscode.window.showTextDocument(doc);
    const problem = await waitFor('unknown decision problem', () =>
      vscode.languages.getDiagnostics(doc.uri).find((d) => d.source === 'archify' && /Unknown decision "nobody-decided"/.test(d.message)),
    );
    assert.equal(problem.range.start.line, 5);
    assert.ok(!vscode.languages.getDiagnostics(doc.uri).some((d) => /queue-between-api-and-worker/.test(d.message)), 'the known decision is not reported');
    await vscode.workspace.fs.delete(bad);
  });

  await check('Archify | New Diagram… → Model creates main.archify from the folder name', async () => {
    const folder = workspaceFile('new-shop');
    await vscode.workspace.fs.createDirectory(folder);
    const { window } = vscode;
    const originalPick = window.showQuickPick;
    (window as { showQuickPick: unknown }).showQuickPick = async (items: Thenable<{ label: string }[]> | { label: string }[]) => (await items).find((i) => /^Model/.test(i.label));
    try {
      await vscode.commands.executeCommand('archify.newDiagram', folder);
    } finally {
      window.showQuickPick = originalPick;
    }
    const main = vscode.Uri.joinPath(folder, 'main.archify');
    let content = '';
    for (let i = 0; i < 50 && !content; i++) {
      try {
        content = new TextDecoder().decode(await vscode.workspace.fs.readFile(main));
      } catch {
        await new Promise((resolve) => setTimeout(resolve, 200));
      }
    }
    assert.match(content, /id: new-shop/);
    assert.match(content, /name: New shop/);
  });

  await check('Archify | New Model… creates a model folder from an example and opens its page', async () => {
    const commands = vscode.extensions.getExtension(EXTENSION_ID)?.packageJSON.contributes.commands as { command: string; title: string }[];
    assert.equal(commands.find((item) => item.command === 'archify.newModel')?.title, 'Archify | New Model…');
    const parent = workspaceFile('.');
    const window = vscode.window as unknown as Record<string, unknown>;
    const originalPick = window.showQuickPick;
    const originalInput = window.showInputBox;
    let labels: string[] = [];
    let existingNameMessage: unknown;
    window.showQuickPick = async (items: readonly { label: string }[]) => {
      labels = (await items).map((item) => item.label);
      return (await items).find((item) => item.label === 'C4 - E-Shop');
    };
    window.showInputBox = async (options: vscode.InputBoxOptions) => {
      existingNameMessage = await options.validateInput?.('new-shop');
      return 'shop-two';
    };
    try {
      await vscode.commands.executeCommand('archify.newModel', parent);
    } finally {
      window.showQuickPick = originalPick;
      window.showInputBox = originalInput;
    }
    assert.deepEqual(labels, ['C4 - Standard Web App', 'C4 - E-Shop', 'C4 - Event-Based Integration']);
    assert.match(String(existingNameMessage), /already exists/);
    const folder = vscode.Uri.joinPath(parent, 'shop-two');
    const main = vscode.Uri.joinPath(folder, 'main.archify');
    const content = new TextDecoder().decode(await vscode.workspace.fs.readFile(main));
    assert.match(content, /id: shop-two/);
    assert.match(content, /name: Shop two/);
    assert.match(content, /title: Shop two — overview/);
    const names = (await vscode.workspace.fs.readDirectory(folder)).map(([name]) => name).sort();
    assert.deepEqual(names, ['0100-context', '0200-containers', '0300-components', 'decisions', 'main.archify', 'registry']);
    const registry = (await vscode.workspace.fs.readDirectory(vscode.Uri.joinPath(folder, 'registry'))).map(([name]) => name).sort();
    assert.deepEqual(registry, ['containers.archify-registry', 'people.archify-registry', 'systems.archify-registry']);
    const tab = await waitFor('model page tab', () =>
      vscode.window.tabGroups.all.flatMap((g) => g.tabs).find((t) => t.isActive && t.input instanceof vscode.TabInputCustom && t.input.uri.toString() === main.toString()),
    );
    assert.ok(tab);
    // The new model is indexed: its diagrams resolve against the copied registry.
    const containers = await vscode.workspace.openTextDocument(vscode.Uri.joinPath(folder, '0200-containers', 'online-shop.archify'));
    await vscode.window.showTextDocument(containers);
    await new Promise((resolve) => setTimeout(resolve, 1500));
    const errors = vscode.languages.getDiagnostics(containers.uri).filter((d) => d.severity === vscode.DiagnosticSeverity.Error);
    assert.deepEqual(errors.map((d) => d.message), []);
  });
}