// @vitest-environment jsdom
import { act, renderHook } from "@testing-library/react";
import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";

import { useContinue } from "./useContinue";

const post = vi.fn();
const toast = vi.fn();
vi.mock("@/lib/api/client", () => ({
  api: { POST: (...a: unknown[]) => post(...a) },
}));
vi.mock("@/components/Toast", () => ({ useToast: () => toast }));

const GEN_PATH = "/projects/{project_id}/skills/{tool_key}/generate";

describe("useContinue", () => {
  beforeEach(() => {
    post.mockReset();
    toast.mockReset();
  });
  afterEach(() => vi.clearAllMocks());

  it("初始为 idle，无候选", () => {
    const { result } = renderHook(() => useContinue());
    expect(result.current.status).toBe("idle");
    expect(result.current.candidates).toEqual([]);
  });

  it("续写：调 continue 生成器（读该章前文），产出一条候选，status=ready", async () => {
    post.mockResolvedValue({
      data: { output_kind: "ContinuationResult", preview: { text: "续写正文一" } },
      error: null,
    });

    const { result } = renderHook(() => useContinue());
    await act(async () => {
      await result.current.generate("p1", 3);
    });

    expect(post).toHaveBeenCalledWith(GEN_PATH, {
      params: { path: { project_id: "p1", tool_key: "continue" } },
      body: { brief: "", chapter_no: 3 },
    });
    expect(result.current.status).toBe("ready");
    expect(result.current.candidates).toEqual(["续写正文一"]);
  });

  it("多候选：再次生成累加候选，不覆盖前一条", async () => {
    post
      .mockResolvedValueOnce({ data: { preview: { text: "候选一" } }, error: null })
      .mockResolvedValueOnce({ data: { preview: { text: "候选二" } }, error: null });

    const { result } = renderHook(() => useContinue());
    await act(async () => {
      await result.current.generate("p1", 1);
    });
    await act(async () => {
      await result.current.generate("p1", 1);
    });

    expect(result.current.candidates).toEqual(["候选一", "候选二"]);
  });

  it("产出为空：不加候选、提示重试、status=ready", async () => {
    post.mockResolvedValue({ data: { preview: { text: "" } }, error: null });
    const { result } = renderHook(() => useContinue());
    await act(async () => {
      await result.current.generate("p1", 1);
    });
    expect(result.current.candidates).toEqual([]);
    expect(result.current.status).toBe("ready");
    expect(toast).toHaveBeenCalledWith(expect.any(String), "info");
  });

  it("后端返回 error：status=error、弹错误 toast、候选不变", async () => {
    post.mockResolvedValue({ data: null, error: { detail: "配额不足" } });
    const { result } = renderHook(() => useContinue());
    await act(async () => {
      await result.current.generate("p1", 1);
    });
    expect(result.current.status).toBe("error");
    expect(result.current.candidates).toEqual([]);
    expect(toast).toHaveBeenCalledWith(expect.any(String), "error");
  });

  it("请求抛异常：status=error、弹网络异常 toast", async () => {
    post.mockRejectedValue(new Error("network down"));
    const { result } = renderHook(() => useContinue());
    await act(async () => {
      await result.current.generate("p1", 1);
    });
    expect(result.current.status).toBe("error");
    expect(toast).toHaveBeenCalledWith("续写请求异常，请检查网络。", "error");
  });

  it("reset 清回 idle 与空候选", async () => {
    post.mockResolvedValue({ data: { preview: { text: "候选" } }, error: null });
    const { result } = renderHook(() => useContinue());
    await act(async () => {
      await result.current.generate("p1", 1);
    });
    act(() => result.current.reset());
    expect(result.current.status).toBe("idle");
    expect(result.current.candidates).toEqual([]);
  });
});