import * as assert from "assert";
import * as fs from "fs";
import * as path from "path";
import * as vscode from "vscode";
import type { CowritingApi } from "../../../src/extension";

const WS = process.env.E2E_WORKSPACE!;
const settle = () => new Promise((r) => setTimeout(r, 400));

async function getApi(): Promise<CowritingApi> {
  const ext = vscode.extensions.getExtension("benstull.vscode-cowriting-plugin")!;
  const api = (await ext.activate()) as CowritingApi;
  assert.ok(api?.trackChangesPreviewController, "exports preview controller");
  return api;
}

async function freshDoc(rel: string, body: string): Promise<{ doc: vscode.TextDocument; key: string }> {
  const abs = path.join(WS, rel);
  fs.mkdirSync(path.dirname(abs), { recursive: true });
  fs.writeFileSync(abs, body, "utf8");
  const uri = vscode.Uri.file(abs);
  const doc = await vscode.workspace.openTextDocument(uri);
  return { doc, key: uri.toString() };
}

function pkg(): any {
  return JSON.parse(fs.readFileSync(path.join(__dirname, "../../../../package.json"), "utf8"));
}
function menu(id: string): Array<{ command: string; when?: string; group?: string }> {
  return pkg().contributes.menus[id] ?? [];
}

// SLICE-1 / #42 (reach): "Ask Claude to Edit" reachable from the editor BODY and
// the editor TAB, selection-aware (selection → editSelection; no selection →
// editDocument), both markdown/authorable-gated, both routing through the single
// runEditAndPropose path (INV-38). The menu `when` clauses are declarative, so we
// assert them directly; the tab-targeting behavior is exercised through the command.
suite("F12 SLICE-1 — Ask-Claude reach (#42, INV-38)", () => {
  // PUC-1/2: editor BODY (editor/context) is selection-aware + markdown-gated.
  test("editor/context offers editSelection (with selection) and editDocument (without), markdown+authorable", () => {
    const m = menu("editor/context");
    const sel = m.find((e) => e.command === "cowriting.editSelection");
    const doc = m.find((e) => e.command === "cowriting.editDocument");
    assert.ok(sel, "editSelection is in editor/context");
    assert.ok(doc, "editDocument is in editor/context");

    assert.match(sel!.when ?? "", /editorHasSelection/, "editSelection shows only with a selection");
    assert.ok(!/!\s*editorHasSelection/.test(sel!.when ?? ""), "editSelection is not gated on NO selection");
    assert.match(sel!.when ?? "", /editorLangId == markdown/, "editSelection gated on markdown");
    assert.match(sel!.when ?? "", /resourceScheme == file|resourceScheme == untitled/, "editSelection gated authorable");

    assert.match(doc!.when ?? "", /!\s*editorHasSelection/, "editDocument shows only without a selection");
    assert.match(doc!.when ?? "", /editorLangId == markdown/, "editDocument gated on markdown");
    assert.match(doc!.when ?? "", /resourceScheme == file|resourceScheme == untitled/, "editDocument gated authorable");
  });

  // PUC-3: editor TAB (editor/title/context) carries the same selection-aware pair.
  test("editor/title/context offers editSelection (with selection) and editDocument (without), markdown-gated", () => {
    const m = menu("editor/title/context");
    const sel = m.find((e) => e.command === "cowriting.editSelection");
    const doc = m.find((e) => e.command === "cowriting.editDocument");
    assert.ok(sel, "editSelection is in editor/title/context");
    assert.ok(doc, "editDocument is in editor/title/context");

    assert.match(sel!.when ?? "", /editorHasSelection/, "tab editSelection shows only with a selection");
    assert.ok(!/!\s*editorHasSelection/.test(sel!.when ?? ""), "tab editSelection is not gated on NO selection");
    assert.match(sel!.when ?? "", /resourceLangId == markdown/, "tab editSelection gated on markdown");

    assert.match(doc!.when ?? "", /!\s*editorHasSelection/, "tab editDocument shows only without a selection");
    assert.match(doc!.when ?? "", /resourceLangId == markdown/, "tab editDocument gated on markdown");
  });

  // PUC-3 behavior: editDocument invoked with a tab URI targets THAT document,
  // not whatever editor happens to be active (mirrors #41's clicked-doc resolution).
  test("editDocument(uri) targets the clicked tab's document, not the active editor", async () => {
    const api = await getApi();
    const ctl = api.trackChangesPreviewController;

    // Doc A is the active editor; Doc B is the "clicked tab" we pass by URI.
    const a = await freshDoc("docs/f12-active.md", "# Active\n\nThe active editor paragraph.\n");
    const b = await freshDoc("docs/f12-tab.md", "# Tab\n\nThe tab target paragraph to rewrite.\n");
    await vscode.window.showTextDocument(a.doc);
    await settle();

    // Stub the instruction prompt (sealed input box can't run in CI) + the LLM turn.
    const origInput = vscode.window.showInputBox;
    (vscode.window as any).showInputBox = async () => "rewrite it";
    ctl.setEditTurnForTest(async () => ({
      replacement: "# Tab\n\nThe REWRITTEN tab paragraph.\n",
      model: "sonnet",
      sessionId: "e2e-f12-tab",
    }));
    try {
      await vscode.commands.executeCommand("cowriting.editDocument", b.doc.uri);
      await settle();
    } finally {
      (vscode.window as any).showInputBox = origInput;
    }

    // The proposal(s) landed on the TAB doc (B), and the ACTIVE doc (A) has none.
    assert.ok(api.proposalController.listProposals(b.doc).length >= 1, "tab doc B received the document-edit proposal(s)");
    assert.strictEqual(
      api.proposalController.listProposals(a.doc).length,
      0,
      "active doc A was NOT edited — editDocument honored the tab URI",
    );
    // INV-10: proposing never mutates the document.
    assert.ok(b.doc.getText().includes("tab target paragraph"), "tab doc unchanged by propose");
  });

  // No URI arg (palette / keybinding) → fall back to the active editor.
  test("editDocument() with no arg targets the active editor", async () => {
    const api = await getApi();
    const ctl = api.trackChangesPreviewController;
    const a = await freshDoc("docs/f12-noarg.md", "# No arg\n\nThe active doc paragraph here.\n");
    await vscode.window.showTextDocument(a.doc);
    await settle();

    const origInput = vscode.window.showInputBox;
    (vscode.window as any).showInputBox = async () => "rewrite it";
    ctl.setEditTurnForTest(async () => ({
      replacement: "# No arg\n\nThe REWRITTEN active doc paragraph.\n",
      model: "sonnet",
      sessionId: "e2e-f12-noarg",
    }));
    try {
      await vscode.commands.executeCommand("cowriting.editDocument");
      await settle();
    } finally {
      (vscode.window as any).showInputBox = origInput;
    }
    assert.ok(api.proposalController.listProposals(a.doc).length >= 1, "active doc received the proposal(s) on no-arg");
  });
});