import { test, expect } from "@playwright/test";

/**
 * E2E test for the real-backend SSE chat path.
 *
 * Stubs the actual endpoints the chat page uses:
 * - POST /api/projects → ensures a project exists
 * - POST /api/projects/proj-test/tasks → creates a task (conversation_id)
 * - POST ${PHYLO_BACKEND}/api/tasks/{id}/messages/stream → SSE stream
 *
 * The page calls createConversation() which calls ensureDefaultProject() +
 * createTask(), then getStreamUrl() which posts to /api/tasks/{id}/messages/stream.
 */
test("SSE chat path renders streamed assistant response", async ({ page }) => {
  const taskId = "task-e2e-test";

  // Stub project creation/lookup
  await page.route("**/api/projects", async (route) => {
    await route.fulfill({
      status: 200,
      contentType: "application/json",
      body: JSON.stringify({ id: "proj-test", name: "Quick Tasks" }),
    });
  });

  // Stub task creation (createConversation → createTask)
  await page.route("**/api/projects/proj-test/tasks", async (route) => {
    if (route.request().method() === "POST") {
      await route.fulfill({
        status: 200,
        contentType: "application/json",
        body: JSON.stringify({ id: taskId, projectId: "proj-test", title: "(new conversation)", createdAt: Date.now(), updatedAt: Date.now(), messages: [], artifacts: [] }),
      });
    } else {
      await route.fallback();
    }
  });

  // Stub the SSE stream endpoint (where sendReal posts the message)
  await page.route(`**/api/tasks/${taskId}/messages/stream`, async (route) => {
    const sseBody = [
      'data: {"type":"text_delta","text":"Hello "}',
      'data: {"type":"text_delta","text":"world"}',
      'data: {"type":"done"}',
      "",
    ].join("\n");

    await route.fulfill({
      status: 200,
      contentType: "text/event-stream",
      body: sseBody,
    });
  });

  // Stub dataset sync status (called on mount for greeting runtime spec)
  await page.route("**/api/datasets/sync/status", async (route) => {
    await route.fulfill({
      status: 200,
      contentType: "application/json",
      body: JSON.stringify([]),
    });
  });

  // Stub task PATCH (persistence after assistant response)
  await page.route(`**/api/tasks/${taskId}`, async (route) => {
    if (route.request().method() === "PATCH") {
      await route.fulfill({ status: 200, contentType: "application/json", body: "{}" });
    } else {
      await route.fallback();
    }
  });

  // Stub message append
  await page.route(`**/api/tasks/${taskId}/messages`, async (route) => {
    await route.fulfill({ status: 200, contentType: "application/json", body: "{}" });
  });

  await page.goto("/chat");

  // Wait for the page to be ready (conversation created, input available)
  const textarea = page.locator("textarea");
  await expect(textarea).toBeVisible({ timeout: 10_000 });

  // Type a message and send
  await textarea.fill("Test message");
  await textarea.press("Enter");

  // Assert the assistant message contains the streamed text
  await expect(page.locator("text=Hello world")).toBeVisible({ timeout: 10_000 });

  // Assert no error banners
  await expect(page.locator("text=Connection error")).not.toBeVisible();
});