import { describe, it, expect, vi } from "vitest";
import { render, screen } from "@testing-library/react";
import { TaskDetailModal } from "../TaskDetailModal";
import type { TaskDetail, Column, MergeResult, Task } from "@hai/core";

function makeTask(overrides: Partial<TaskDetail> = {}): TaskDetail {
  return {
    id: "HAI-099",
    description: "Test task",
    column: "in-progress" as Column,
    dependencies: [],
    prompt: "",
    steps: [],
    currentStep: 0,
    log: [],
    createdAt: "2026-01-01T00:00:00Z",
    updatedAt: "2026-01-01T00:00:00Z",
    ...overrides,
  } as TaskDetail;
}

const noop = vi.fn();
const noopMove = vi.fn(async () => ({}) as Task);
const noopDelete = vi.fn(async () => ({}) as Task);
const noopMerge = vi.fn(async () => ({ merged: false }) as MergeResult);
const noopRetry = vi.fn(async () => ({}) as Task);

describe("TaskDetailModal", () => {
  it("renders markdown-body without detail-prompt class when prompt exists", () => {
    const { container } = render(
      <TaskDetailModal
        task={makeTask({ prompt: "# Hello\n\nSome **bold** text" })}
        onClose={noop}
        onMoveTask={noopMove}
        onDeleteTask={noopDelete}
        onMergeTask={noopMerge}
        addToast={noop}
      />,
    );

    const markdownDiv = container.querySelector(".markdown-body");
    expect(markdownDiv).toBeTruthy();
    expect(markdownDiv!.classList.contains("detail-prompt")).toBe(false);
  });

  it("strips the leading heading from prompt and renders remaining markdown", () => {
    const { container } = render(
      <TaskDetailModal
        task={makeTask({ prompt: "# Hello\n\nSome **bold** text" })}
        onClose={noop}
        onMoveTask={noopMove}
        onDeleteTask={noopDelete}
        onMergeTask={noopMerge}
        addToast={noop}
      />,
    );

    // The leading # heading should be stripped (modal has its own header)
    expect(container.querySelector(".markdown-body h1")).toBeNull();
    expect(container.querySelector("strong")?.textContent).toBe("bold");
  });

  it("renders (no prompt) with detail-prompt class when prompt is absent", () => {
    const { container } = render(
      <TaskDetailModal
        task={makeTask({ prompt: undefined })}
        onClose={noop}
        onMoveTask={noopMove}
        onDeleteTask={noopDelete}
        onMergeTask={noopMerge}
        addToast={noop}
      />,
    );

    const fallback = screen.getByText("(no prompt)");
    expect(fallback).toBeTruthy();
    expect(fallback.classList.contains("detail-prompt")).toBe(true);
    expect(fallback.classList.contains("markdown-body")).toBe(false);
  });

  it("does not render a PROMPT.md heading", () => {
    render(
      <TaskDetailModal
        task={makeTask({ prompt: "# Some prompt content" })}
        onClose={noop}
        onMoveTask={noopMove}
        onDeleteTask={noopDelete}
        onMergeTask={noopMerge}
        addToast={noop}
      />,
    );

    expect(screen.queryByText("PROMPT.md")).toBeNull();
  });

  it("renders Retry button when task status is 'failed'", () => {
    render(
      <TaskDetailModal
        task={makeTask({ status: "failed" })}
        onClose={noop}
        onMoveTask={noopMove}
        onDeleteTask={noopDelete}
        onMergeTask={noopMerge}
        onRetryTask={noopRetry}
        addToast={noop}
      />,
    );

    expect(screen.getByText("Retry")).toBeTruthy();
  });

  it("does NOT render Retry button when task status is not 'failed'", () => {
    render(
      <TaskDetailModal
        task={makeTask({ status: "executing" })}
        onClose={noop}
        onMoveTask={noopMove}
        onDeleteTask={noopDelete}
        onMergeTask={noopMerge}
        onRetryTask={noopRetry}
        addToast={noop}
      />,
    );

    expect(screen.queryByText("Retry")).toBeNull();
  });

  it("does NOT render Retry button when onRetryTask is not provided", () => {
    render(
      <TaskDetailModal
        task={makeTask({ status: "failed" })}
        onClose={noop}
        onMoveTask={noopMove}
        onDeleteTask={noopDelete}
        onMergeTask={noopMerge}
        addToast={noop}
      />,
    );

    expect(screen.queryByText("Retry")).toBeNull();
  });

  it("shows description exactly once for a task without title", () => {
    const { container } = render(
      <TaskDetailModal
        task={makeTask({
          title: undefined,
          description: "Fix the login bug",
          prompt: "# HAI-099\n\nFix the login bug\n",
        })}
        onClose={noop}
        onMoveTask={noopMove}
        onDeleteTask={noopDelete}
        onMergeTask={noopMerge}
        addToast={noop}
      />,
    );

    // The heading "HAI-099" should be stripped from the markdown
    const markdownBody = container.querySelector(".markdown-body");
    expect(markdownBody?.innerHTML).not.toContain("HAI-099");
    // Description appears in the markdown body
    expect(markdownBody?.textContent).toContain("Fix the login bug");
    // The detail header shows the ID (not duplicated as markdown heading)
    expect(container.querySelector(".detail-id")?.textContent).toBe("HAI-099");
    // The h2 title shows description, not the task ID
    const h2 = container.querySelector("h2.detail-title");
    expect(h2?.textContent).toBe("Fix the login bug");
  });

  it("shows the title in <h2> when task.title is set", () => {
    const { container } = render(
      <TaskDetailModal
        task={makeTask({
          title: "Implement dark mode",
          description: "Add dark mode toggle to the settings page",
        })}
        onClose={noop}
        onMoveTask={noopMove}
        onDeleteTask={noopDelete}
        onMergeTask={noopMerge}
        addToast={noop}
      />,
    );

    const h2 = container.querySelector("h2.detail-title");
    expect(h2?.textContent).toBe("Implement dark mode");
  });

  it("always shows task.id in the detail-id badge regardless of title", () => {
    // With title
    const { container: withTitle } = render(
      <TaskDetailModal
        task={makeTask({ title: "Some title" })}
        onClose={noop}
        onMoveTask={noopMove}
        onDeleteTask={noopDelete}
        onMergeTask={noopMerge}
        addToast={noop}
      />,
    );
    expect(withTitle.querySelector(".detail-id")?.textContent).toBe("HAI-099");

    // Without title
    const { container: withoutTitle } = render(
      <TaskDetailModal
        task={makeTask({ title: undefined, description: "A description" })}
        onClose={noop}
        onMoveTask={noopMove}
        onDeleteTask={noopDelete}
        onMergeTask={noopMerge}
        addToast={noop}
      />,
    );
    expect(withoutTitle.querySelector(".detail-id")?.textContent).toBe("HAI-099");
  });

  it("activity list does not have nested scroll constraints", () => {
    const { container } = render(
      <TaskDetailModal
        task={makeTask({
          log: [
            { timestamp: "2026-01-01T00:00:00Z", message: "Created task" },
            { timestamp: "2026-01-01T00:01:00Z", message: "Started work" },
            { timestamp: "2026-01-01T00:02:00Z", message: "Completed step 1" },
          ],
        })}
        onClose={noop}
        onMoveTask={noopMove}
        onDeleteTask={noopDelete}
        onMergeTask={noopMerge}
        addToast={noop}
      />,
    );

    const activityList = container.querySelector(".detail-activity-list");
    expect(activityList).toBeTruthy();
    const style = (activityList as HTMLElement).style;
    expect(style.overflowY).not.toBe("auto");
    expect(style.maxHeight).toBe("");
  });
});