/**
 * @vitest-environment jsdom
 */
import React from "react";
import { act } from "react";
import { createRoot, type Root } from "react-dom/client";
import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
import type { StreamItem } from "@/types/stream";
import { AgentStreamView } from "./agent-stream-view";

const assistantMessageCalls = vi.hoisted(
  () => [] as Array<{ message: string; spacing: string | undefined }>,
);
const turnCopyButtonCalls = vi.hoisted(() => [] as Array<{ getContent: () => string }>);

const mockSessionState = vi.hoisted(() => ({
  sessions: {
    server: {
      client: null,
      agentStreamHead: new Map<string, StreamItem[]>(),
      workspaces: new Map(),
    },
  },
}));

vi.mock("react-native-unistyles", () => ({
  StyleSheet: {
    create: (
      factory: (theme: {
        borderRadius: Record<string, number>;
        borderWidth: Record<number, number>;
        colors: Record<string, string>;
        fontSize: Record<string, number>;
        fontWeight: Record<string, string>;
        shadow: Record<string, object>;
        spacing: Record<number, number>;
      }) => unknown,
    ) =>
      factory({
        borderRadius: {
          full: 9999,
          md: 6,
        },
        borderWidth: {
          1: 1,
        },
        colors: {
          foreground: "#fff",
          foregroundMuted: "#aaa",
          surface0: "#000",
          surface1: "#111",
          surface2: "#222",
          border: "#333",
          borderAccent: "#444",
        },
        fontSize: {
          sm: 14,
          base: 16,
          xs: 12,
        },
        fontWeight: {
          normal: "normal",
        },
        shadow: {
          sm: {},
        },
        spacing: {
          1: 4,
          2: 8,
          3: 12,
          4: 16,
          12: 48,
        },
      }),
  },
  useUnistyles: () => ({ rt: { breakpoint: "md" } }),
  withUnistyles: (Component: unknown) => Component,
}));

vi.mock("react-native-reanimated", async () => {
  const ReactModule = await import("react");
  return {
    default: {
      View: ({ children, ...props }: { children?: React.ReactNode }) =>
        ReactModule.createElement("div", props, children),
    },
    Easing: { linear: vi.fn() },
    FadeIn: { duration: vi.fn(() => undefined) },
    FadeOut: { duration: vi.fn(() => undefined) },
    cancelAnimation: vi.fn(),
    useAnimatedStyle: (factory: () => unknown) => factory(),
    useSharedValue: (value: unknown) => ({ value }),
    withRepeat: (value: unknown) => value,
    withTiming: (value: unknown) => value,
  };
});

vi.mock("lucide-react-native", async () => {
  const ReactModule = await import("react");
  const Icon = () => ReactModule.createElement("span");
  return {
    Check: Icon,
    ChevronDown: Icon,
    X: Icon,
  };
});

vi.mock("./message", async () => {
  const ReactModule = await import("react");
  return {
    ActivityLog: () => null,
    AssistantMessage: (props: { message: string; spacing?: string }) => {
      assistantMessageCalls.push({ message: props.message, spacing: props.spacing });
      return ReactModule.createElement("div", {
        "data-message": props.message,
        "data-spacing": props.spacing ?? "",
      });
    },
    CompactionMarker: () => null,
    MessageOuterSpacingProvider: ({ children }: { children: React.ReactNode }) =>
      ReactModule.createElement(ReactModule.Fragment, null, children),
    SpeakMessage: () => null,
    TodoListCard: () => null,
    ToolCall: () => null,
    TurnCopyButton: (props: { getContent: () => string }) => {
      turnCopyButtonCalls.push(props);
      return ReactModule.createElement("button", {
        "data-testid": "turn-copy-button",
        type: "button",
      });
    },
    UserMessage: () => null,
  };
});

vi.mock("./tool-call-sheet", async () => {
  const ReactModule = await import("react");
  return {
    ToolCallSheetProvider: ({ children }: { children: React.ReactNode }) =>
      ReactModule.createElement(ReactModule.Fragment, null, children),
    useToolCallSheet: () => ({ open: vi.fn() }),
  };
});

vi.mock("./tool-call-details", () => ({ ToolCallDetailsContent: () => null }));
vi.mock("./use-web-scrollbar", () => ({ useWebElementScrollbar: () => null }));
vi.mock("./question-form-card", () => ({ QuestionFormCard: () => null }));
vi.mock("./plan-card", () => ({ PlanCard: () => null }));
vi.mock("@/hooks/use-file-explorer-actions", () => ({
  useFileExplorerActions: () => ({ requestDirectoryListing: vi.fn() }),
}));
vi.mock("@/stores/panel-store", () => ({
  usePanelStore: (selector: (state: Record<string, unknown>) => unknown) =>
    selector({
      openFileExplorerForCheckout: vi.fn(),
      setExplorerTabForCheckout: vi.fn(),
    }),
}));
vi.mock("@/stores/session-store", () => ({
  useSessionStore: Object.assign(
    (selector: (state: typeof mockSessionState) => unknown) => selector(mockSessionState),
    {
      getState: () => mockSessionState,
    },
  ),
}));
vi.mock("expo-router", () => ({ useRouter: () => ({ navigate: vi.fn() }) }));

function assistantBlock(params: {
  id: string;
  text: string;
  blockIndex: number;
}): Extract<StreamItem, { kind: "assistant_message" }> {
  return {
    kind: "assistant_message",
    id: params.id,
    blockGroupId: "group-1",
    blockIndex: params.blockIndex,
    text: params.text,
    timestamp: new Date("2026-05-01T00:00:00.000Z"),
  };
}

function runningToolCall(id: string): Extract<StreamItem, { kind: "tool_call" }> {
  return {
    kind: "tool_call",
    id,
    timestamp: new Date("2026-05-01T00:00:00.000Z"),
    payload: {
      source: "orchestrator",
      data: {
        toolCallId: id,
        toolName: "bash",
        arguments: "npm test",
        result: null,
        status: "executing",
      },
    },
  };
}

describe("AgentStreamView", () => {
  let root: Root | null = null;
  let container: HTMLDivElement | null = null;
  let originalScrollTo: HTMLElement["scrollTo"] | undefined;

  beforeEach(() => {
    Object.defineProperty(globalThis, "IS_REACT_ACT_ENVIRONMENT", {
      value: true,
      configurable: true,
    });
    originalScrollTo = HTMLElement.prototype.scrollTo;
    HTMLElement.prototype.scrollTo = vi.fn();
    assistantMessageCalls.length = 0;
    turnCopyButtonCalls.length = 0;
    mockSessionState.sessions.server.agentStreamHead = new Map();
    container = document.createElement("div");
    document.body.appendChild(container);
    root = createRoot(container);
  });

  afterEach(() => {
    if (root) {
      act(() => {
        root?.unmount();
      });
    }
    root = null;
    container?.remove();
    container = null;
    if (originalScrollTo) {
      HTMLElement.prototype.scrollTo = originalScrollTo;
    } else {
      Reflect.deleteProperty(HTMLElement.prototype, "scrollTo");
    }
    vi.restoreAllMocks();
  });

  it("compacts assistant block spacing across the history/live-head boundary", () => {
    const tailBlock = assistantBlock({
      id: "group-1:block:0",
      text: "First paragraph",
      blockIndex: 0,
    });
    const headBlock = assistantBlock({
      id: "group-1:head",
      text: "Second paragraph",
      blockIndex: 1,
    });
    mockSessionState.sessions.server.agentStreamHead.set("agent-1", [headBlock]);
    const agent = {
      id: "agent-1",
      serverId: "server",
      status: "idle",
      cwd: "/tmp/project",
    } as never;
    const streamItems = [tailBlock];
    const pendingPermissions = new Map();

    act(() => {
      root?.render(
        React.createElement(AgentStreamView, {
          agentId: "agent-1",
          serverId: "server",
          agent,
          streamItems,
          pendingPermissions,
        }),
      );
    });

    const tailCalls = assistantMessageCalls.filter((call) => call.message === "First paragraph");
    const headCalls = assistantMessageCalls.filter((call) => call.message === "Second paragraph");

    expect(tailCalls.length).toBeGreaterThan(0);
    expect(headCalls.length).toBeGreaterThan(0);
    expect(tailCalls.map((call) => call.spacing)).toEqual(
      Array.from({ length: tailCalls.length }, () => "compactBottom"),
    );
    expect(headCalls.map((call) => call.spacing)).toEqual(
      Array.from({ length: headCalls.length }, () => "compactTop"),
    );
  });

  it("renders running dots in the assistant turn footer when live text is streaming", () => {
    const headBlock = assistantBlock({
      id: "group-1:head",
      text: "Streaming paragraph",
      blockIndex: 0,
    });
    mockSessionState.sessions.server.agentStreamHead.set("agent-1", [headBlock]);
    const agent = {
      id: "agent-1",
      serverId: "server",
      status: "running",
      cwd: "/tmp/project",
    } as never;

    act(() => {
      root?.render(
        React.createElement(AgentStreamView, {
          agentId: "agent-1",
          serverId: "server",
          agent,
          streamItems: [],
          pendingPermissions: new Map(),
        }),
      );
    });

    expect(container?.querySelector('[data-testid="turn-working-indicator"]')).not.toBeNull();
    expect(
      container?.querySelector('[data-testid="stream-working-indicator-auxiliary"]'),
    ).toBeNull();
    expect(container?.querySelector('[data-testid="turn-copy-button"]')).toBeNull();
  });

  it("only renders running dots on the live assistant row", () => {
    const tailBlock = assistantBlock({
      id: "group-1:block:0",
      text: "History paragraph",
      blockIndex: 0,
    });
    const headBlock = assistantBlock({
      id: "group-2:head",
      text: "Streaming paragraph",
      blockIndex: 0,
    });
    mockSessionState.sessions.server.agentStreamHead.set("agent-1", [headBlock]);
    const agent = {
      id: "agent-1",
      serverId: "server",
      status: "running",
      cwd: "/tmp/project",
    } as never;

    act(() => {
      root?.render(
        React.createElement(AgentStreamView, {
          agentId: "agent-1",
          serverId: "server",
          agent,
          streamItems: [tailBlock],
          pendingPermissions: new Map(),
        }),
      );
    });

    expect(container?.querySelectorAll('[data-testid="turn-working-indicator"]')).toHaveLength(1);
    expect(
      container?.querySelector('[data-testid="stream-working-indicator-auxiliary"]'),
    ).toBeNull();
  });

  it("keeps the auxiliary running dots when there is no live assistant row", () => {
    mockSessionState.sessions.server.agentStreamHead.set("agent-1", [runningToolCall("tool-1")]);
    const agent = {
      id: "agent-1",
      serverId: "server",
      status: "running",
      cwd: "/tmp/project",
    } as never;

    act(() => {
      root?.render(
        React.createElement(AgentStreamView, {
          agentId: "agent-1",
          serverId: "server",
          agent,
          streamItems: [],
          pendingPermissions: new Map(),
        }),
      );
    });

    expect(container?.querySelector('[data-testid="turn-working-indicator"]')).toBeNull();
    expect(
      container?.querySelector('[data-testid="stream-working-indicator-auxiliary"]'),
    ).not.toBeNull();
  });

  it("replaces the running footer with the copy button when the assistant turn idles", () => {
    const headBlock = assistantBlock({
      id: "group-1:head",
      text: "Complete paragraph",
      blockIndex: 0,
    });
    mockSessionState.sessions.server.agentStreamHead.set("agent-1", [headBlock]);
    const agent = {
      id: "agent-1",
      serverId: "server",
      status: "idle",
      cwd: "/tmp/project",
    } as never;

    act(() => {
      root?.render(
        React.createElement(AgentStreamView, {
          agentId: "agent-1",
          serverId: "server",
          agent,
          streamItems: [],
          pendingPermissions: new Map(),
        }),
      );
    });

    expect(container?.querySelector('[data-testid="turn-working-indicator"]')).toBeNull();
    expect(container?.querySelector('[data-testid="turn-copy-button"]')).not.toBeNull();
    expect(turnCopyButtonCalls.length).toBeGreaterThan(0);
    expect(turnCopyButtonCalls.map((call) => call.getContent())).toEqual(
      Array.from({ length: turnCopyButtonCalls.length }, () => "Complete paragraph"),
    );
  });
});