import { describe, it, expect, vi, beforeEach, afterEach } from "vitest";
import { render, screen, fireEvent, waitFor } from "@testing-library/react";
import { QuickEntryBox } from "../QuickEntryBox";
import type { Task } from "@kb/core";

const MOCK_MODELS = [
  {
    provider: "anthropic",
    id: "claude-sonnet-4-5",
    name: "Claude Sonnet 4.5",
    reasoning: true,
    contextWindow: 200_000,
  },
  {
    provider: "openai",
    id: "gpt-4o",
    name: "GPT-4o",
    reasoning: true,
    contextWindow: 128_000,
  },
];

const mockTasks: Task[] = [
  {
    id: "KB-001",
    title: "Test task 1",
    description: "First test task",
    column: "todo",
    dependencies: [],
    steps: [],
    currentStep: 0,
    log: [],
    createdAt: "2026-01-01T00:00:00Z",
    updatedAt: "2026-01-01T00:00:00Z",
  },
  {
    id: "KB-002",
    title: "Test task 2",
    description: "Second test task",
    column: "todo",
    dependencies: [],
    steps: [],
    currentStep: 0,
    log: [],
    createdAt: "2026-02-01T00:00:00Z",
    updatedAt: "2026-02-01T00:00:00Z",
  },
];

// Mock the api module
vi.mock("../../api", () => ({
  fetchModels: vi.fn().mockResolvedValue([
    {
      provider: "anthropic",
      id: "claude-sonnet-4-5",
      name: "Claude Sonnet 4.5",
      reasoning: true,
      contextWindow: 200_000,
    },
    {
      provider: "openai",
      id: "gpt-4o",
      name: "GPT-4o",
      reasoning: true,
      contextWindow: 128_000,
    },
  ]),
}));

function renderQuickEntryBox(props = {}) {
  const defaultProps = {
    onCreate: vi.fn().mockResolvedValue(undefined),
    addToast: vi.fn(),
    tasks: mockTasks,
    availableModels: MOCK_MODELS,
  };
  const result = render(<QuickEntryBox {...defaultProps} {...props} />);
  return { ...result, props: { ...defaultProps, ...props } };
}

describe("QuickEntryBox", () => {
  beforeEach(() => {
    vi.useFakeTimers({ shouldAdvanceTime: true });
  });

  afterEach(() => {
    vi.runOnlyPendingTimers();
    vi.useRealTimers();
  });

  it("renders textarea with placeholder", () => {
    renderQuickEntryBox();
    const textarea = screen.getByTestId("quick-entry-input");
    expect(textarea).toBeTruthy();
    expect(textarea.tagName.toLowerCase()).toBe("textarea");
    expect((textarea as HTMLTextAreaElement).placeholder).toBe("Add a task...");
  });

  it("expands on focus", () => {
    renderQuickEntryBox();
    const textarea = screen.getByTestId("quick-entry-input");

    fireEvent.focus(textarea);

    expect(textarea.classList.contains("quick-entry-input--expanded")).toBe(true);
  });

  it("collapses on blur when empty", async () => {
    renderQuickEntryBox();
    const textarea = screen.getByTestId("quick-entry-input");

    fireEvent.focus(textarea);
    expect(textarea.classList.contains("quick-entry-input--expanded")).toBe(true);

    fireEvent.blur(textarea);
    vi.advanceTimersByTime(250);

    await waitFor(() => {
      expect(textarea.classList.contains("quick-entry-input--expanded")).toBe(false);
    });
  });

  it("stays expanded on blur when has content", async () => {
    renderQuickEntryBox();
    const textarea = screen.getByTestId("quick-entry-input");

    fireEvent.focus(textarea);
    fireEvent.change(textarea, { target: { value: "Some task" } });

    fireEvent.blur(textarea);
    await vi.advanceTimersByTimeAsync(250);

    // Should stay expanded because there's content
    expect(textarea.classList.contains("quick-entry-input--expanded")).toBe(true);
  });

  it("creates task on Enter key with TaskCreateInput", async () => {
    const { props } = renderQuickEntryBox();
    const textarea = screen.getByTestId("quick-entry-input");

    fireEvent.change(textarea, { target: { value: "New task description" } });
    fireEvent.keyDown(textarea, { key: "Enter" });

    await waitFor(() => {
      expect(props.onCreate).toHaveBeenCalledWith(
        expect.objectContaining({
          description: "New task description",
          column: "triage",
        }),
      );
    });
  });

  it("allows Shift+Enter to insert newline when expanded", () => {
    renderQuickEntryBox();
    const textarea = screen.getByTestId("quick-entry-input");

    fireEvent.focus(textarea);
    fireEvent.change(textarea, { target: { value: "Line 1" } });

    // Shift+Enter should not prevent default (allow newline)
    const event = fireEvent.keyDown(textarea, { key: "Enter", shiftKey: true });

    // Event should not be prevented (returns true if preventDefault was NOT called)
    expect(event).toBe(true);
  });

  it("submits on Enter even when expanded (without Shift)", async () => {
    const { props } = renderQuickEntryBox();
    const textarea = screen.getByTestId("quick-entry-input");

    fireEvent.focus(textarea);
    fireEvent.change(textarea, { target: { value: "Task to submit" } });

    // Enter without Shift should submit
    fireEvent.keyDown(textarea, { key: "Enter" });

    await waitFor(() => {
      expect(props.onCreate).toHaveBeenCalledWith(
        expect.objectContaining({
          description: "Task to submit",
        }),
      );
    });
  });

  it("prevents default on Enter key (without Shift)", () => {
    renderQuickEntryBox();
    const textarea = screen.getByTestId("quick-entry-input");

    fireEvent.change(textarea, { target: { value: "Task" } });
    const event = fireEvent.keyDown(textarea, { key: "Enter" });

    // Event is prevented (returns false)
    expect(event).toBe(false);
  });

  it("shows loading state during creation", async () => {
    const { props } = renderQuickEntryBox();
    // Slow down the promise to see loading state
    props.onCreate.mockImplementation(() => new Promise((resolve) => setTimeout(resolve, 100)));

    const textarea = screen.getByTestId("quick-entry-input");
    fireEvent.change(textarea, { target: { value: "New task" } });
    fireEvent.keyDown(textarea, { key: "Enter" });

    // Check loading placeholder
    await waitFor(() => {
      expect((textarea as HTMLTextAreaElement).placeholder).toBe("Creating...");
    });

    // Textarea should be disabled during creation
    expect(textarea).toBeDisabled();
  });

  it("clears input after successful creation", async () => {
    const { props } = renderQuickEntryBox();
    const textarea = screen.getByTestId("quick-entry-input");

    fireEvent.change(textarea, { target: { value: "Task to create" } });
    fireEvent.keyDown(textarea, { key: "Enter" });

    await waitFor(() => {
      expect(props.onCreate).toHaveBeenCalled();
    });

    expect((textarea as HTMLTextAreaElement).value).toBe("");
  });

  it("shows error toast on failure and keeps input content", async () => {
    const { props } = renderQuickEntryBox();
    props.onCreate.mockRejectedValue(new Error("Network error"));

    const textarea = screen.getByTestId("quick-entry-input");
    fireEvent.change(textarea, { target: { value: "Failed task" } });
    fireEvent.keyDown(textarea, { key: "Enter" });

    await waitFor(() => {
      expect(props.addToast).toHaveBeenCalledWith("Network error", "error");
    });

    // Input content should be preserved for retry
    expect((textarea as HTMLTextAreaElement).value).toBe("Failed task");
  });

  it("clears non-empty input on Escape key", () => {
    renderQuickEntryBox();
    const textarea = screen.getByTestId("quick-entry-input");

    fireEvent.change(textarea, { target: { value: "Some text" } });
    expect((textarea as HTMLTextAreaElement).value).toBe("Some text");

    fireEvent.keyDown(textarea, { key: "Escape" });
    expect((textarea as HTMLTextAreaElement).value).toBe("");
  });

  it("collapses and blurs on Escape key", () => {
    renderQuickEntryBox();
    const textarea = screen.getByTestId("quick-entry-input");

    fireEvent.focus(textarea);
    expect(textarea.classList.contains("quick-entry-input--expanded")).toBe(true);

    fireEvent.keyDown(textarea, { key: "Escape" });

    expect(textarea.classList.contains("quick-entry-input--expanded")).toBe(false);
  });

  it("does not clear empty input on Escape key", () => {
    renderQuickEntryBox();
    const textarea = screen.getByTestId("quick-entry-input");

    fireEvent.keyDown(textarea, { key: "Escape" });
    expect((textarea as HTMLTextAreaElement).value).toBe("");
  });

  it("does not submit on Enter if input is empty", async () => {
    const { props } = renderQuickEntryBox();
    const textarea = screen.getByTestId("quick-entry-input");

    fireEvent.keyDown(textarea, { key: "Enter" });

    // Wait a bit to ensure no async call happens
    await new Promise((resolve) => setTimeout(resolve, 50));

    expect(props.onCreate).not.toHaveBeenCalled();
  });

  it("does not submit on Enter if input is only whitespace", async () => {
    const { props } = renderQuickEntryBox();
    const textarea = screen.getByTestId("quick-entry-input");

    fireEvent.change(textarea, { target: { value: "   " } });
    fireEvent.keyDown(textarea, { key: "Enter" });

    await new Promise((resolve) => setTimeout(resolve, 50));

    expect(props.onCreate).not.toHaveBeenCalled();
  });

  it("updates textarea value on change", () => {
    renderQuickEntryBox();
    const textarea = screen.getByTestId("quick-entry-input");

    fireEvent.change(textarea, { target: { value: "Updated text" } });
    expect((textarea as HTMLTextAreaElement).value).toBe("Updated text");
  });

  it("trims whitespace when creating task", async () => {
    const { props } = renderQuickEntryBox();
    const textarea = screen.getByTestId("quick-entry-input");

    fireEvent.change(textarea, { target: { value: "  Task with spaces  " } });
    fireEvent.keyDown(textarea, { key: "Enter" });

    await waitFor(() => {
      expect(props.onCreate).toHaveBeenCalledWith(
        expect.objectContaining({
          description: "Task with spaces",
        }),
      );
    });
  });

  it("maintains focus after successful creation", async () => {
    const { props } = renderQuickEntryBox();
    const textarea = screen.getByTestId("quick-entry-input");

    fireEvent.change(textarea, { target: { value: "Task to create" } });
    fireEvent.keyDown(textarea, { key: "Enter" });

    await waitFor(() => {
      expect(props.onCreate).toHaveBeenCalled();
    });

    // After successful creation, focus should be maintained
    expect(document.activeElement).toBe(textarea);
  });

  describe("Rich creation features", () => {
    it("shows dependency button when typing", () => {
      renderQuickEntryBox();
      const textarea = screen.getByTestId("quick-entry-input");

      // Initially, no controls are visible before focus
      expect(screen.queryByTestId("quick-entry-deps-button")).toBeNull();

      // Type something
      fireEvent.change(textarea, { target: { value: "Task with deps" } });

      // Now the dependency button should be visible
      expect(screen.getByTestId("quick-entry-deps-button")).toBeTruthy();
    });

    it("shows model selector button when typing", () => {
      renderQuickEntryBox();
      const textarea = screen.getByTestId("quick-entry-input");

      // Initially, no controls are visible
      expect(screen.queryByTestId("quick-entry-models-button")).toBeNull();

      // Type something
      fireEvent.change(textarea, { target: { value: "Task with models" } });

      // Now the model selector button should be visible
      expect(screen.getByTestId("quick-entry-models-button")).toBeTruthy();
    });

    it("shows break-into-subtasks toggle when typing", () => {
      renderQuickEntryBox();
      const textarea = screen.getByTestId("quick-entry-input");

      // Initially, no controls are visible
      expect(screen.queryByTestId("quick-entry-subtasks-toggle")).toBeNull();

      // Type something
      fireEvent.change(textarea, { target: { value: "Task to break" } });

      // Now the subtasks toggle should be visible
      expect(screen.getByTestId("quick-entry-subtasks-toggle")).toBeTruthy();
    });

    it("opens dependency dropdown when clicking deps button", () => {
      renderQuickEntryBox();
      const textarea = screen.getByTestId("quick-entry-input");

      fireEvent.change(textarea, { target: { value: "Task with deps" } });
      fireEvent.click(screen.getByTestId("quick-entry-deps-button"));

      // Dropdown should be visible with search input
      expect(document.querySelector(".dep-dropdown")).toBeTruthy();
      expect(document.querySelector(".dep-dropdown-search")).toBeTruthy();
    });

    it("opens model dropdown when clicking models button", () => {
      renderQuickEntryBox();
      const textarea = screen.getByTestId("quick-entry-input");

      fireEvent.change(textarea, { target: { value: "Task with models" } });
      fireEvent.click(screen.getByTestId("quick-entry-models-button"));

      // Dropdown should be visible with model options
      expect(document.querySelector(".inline-create-model-dropdown")).toBeTruthy();
    });

    it("selects dependencies and includes them in submit payload", async () => {
      const { props } = renderQuickEntryBox();
      const textarea = screen.getByTestId("quick-entry-input");

      fireEvent.change(textarea, { target: { value: "Task with deps" } });
      fireEvent.click(screen.getByTestId("quick-entry-deps-button"));

      // Click on a task to select it
      const taskItem = document.querySelector(".dep-dropdown-item");
      expect(taskItem).toBeTruthy();
      fireEvent.click(taskItem!);

      // Close dropdown and submit
      fireEvent.keyDown(textarea, { key: "Enter" });

      await waitFor(() => {
        expect(props.onCreate).toHaveBeenCalledWith(
          expect.objectContaining({
            description: "Task with deps",
            dependencies: expect.arrayContaining(["KB-002"]), // Most recent task
          }),
        );
      });
    });

    it("toggles break-into-subtasks and includes it in submit payload", async () => {
      const { props } = renderQuickEntryBox();
      const textarea = screen.getByTestId("quick-entry-input");

      fireEvent.change(textarea, { target: { value: "Task to break" } });

      const checkbox = screen.getByTestId("quick-entry-subtasks-toggle").querySelector("input");
      expect(checkbox).toBeTruthy();
      fireEvent.click(checkbox!);

      fireEvent.keyDown(textarea, { key: "Enter" });

      await waitFor(() => {
        expect(props.onCreate).toHaveBeenCalledWith(
          expect.objectContaining({
            description: "Task to break",
            breakIntoSubtasks: true,
          }),
        );
      });
    });

    it("includes selected models in submit payload", async () => {
      const { props } = renderQuickEntryBox();
      const textarea = screen.getByTestId("quick-entry-input");

      fireEvent.change(textarea, { target: { value: "Task with model" } });
      fireEvent.click(screen.getByTestId("quick-entry-models-button"));

      // Select executor model
      const executorButton = screen.getByRole("button", { name: "Executor Model" });
      fireEvent.click(executorButton);

      // Select the first model option
      const modelOption = screen.getByText("Claude Sonnet 4.5");
      fireEvent.click(modelOption);

      // Submit the task
      fireEvent.keyDown(textarea, { key: "Enter" });

      await waitFor(() => {
        expect(props.onCreate).toHaveBeenCalledWith(
          expect.objectContaining({
            description: "Task with model",
            modelProvider: "anthropic",
            modelId: "claude-sonnet-4-5",
          }),
        );
      });
    });

    it("closes dropdowns on Escape and preserves input", () => {
      renderQuickEntryBox();
      const textarea = screen.getByTestId("quick-entry-input");

      fireEvent.change(textarea, { target: { value: "Task with dropdown" } });
      fireEvent.click(screen.getByTestId("quick-entry-deps-button"));

      // Dropdown should be open
      expect(document.querySelector(".dep-dropdown")).toBeTruthy();

      // Press Escape - should close dropdown but not clear input
      fireEvent.keyDown(textarea, { key: "Escape" });

      // Dropdown should be closed
      expect(document.querySelector(".dep-dropdown")).toBeNull();

      // Input should still have the value
      expect((textarea as HTMLTextAreaElement).value).toBe("Task with dropdown");
    });

    it("clears all state on second Escape after dropdowns are closed", () => {
      renderQuickEntryBox();
      const textarea = screen.getByTestId("quick-entry-input");

      fireEvent.change(textarea, { target: { value: "Task to clear" } });
      fireEvent.click(screen.getByTestId("quick-entry-subtasks-toggle").querySelector("input")!);

      // First Escape closes any dropdowns
      fireEvent.keyDown(textarea, { key: "Escape" });

      // Second Escape clears everything
      fireEvent.keyDown(textarea, { key: "Escape" });

      // Input should be cleared and collapsed
      expect((textarea as HTMLTextAreaElement).value).toBe("");
      expect(textarea.classList.contains("quick-entry-input--expanded")).toBe(false);
    });

    it("resets all state after successful creation", async () => {
      const { props } = renderQuickEntryBox();
      const textarea = screen.getByTestId("quick-entry-input");

      fireEvent.change(textarea, { target: { value: "Task to reset" } });
      fireEvent.click(screen.getByTestId("quick-entry-subtasks-toggle").querySelector("input")!);

      fireEvent.keyDown(textarea, { key: "Enter" });

      await waitFor(() => {
        expect(props.onCreate).toHaveBeenCalled();
      });

      // After creation, controls should be collapsed
      expect((textarea as HTMLTextAreaElement).value).toBe("");
      expect(screen.queryByTestId("quick-entry-deps-button")).toBeNull();
      expect(screen.queryByTestId("quick-entry-subtasks-toggle")).toBeNull();
    });
  });
});