// @vitest-environment jsdom
import { act, createElement } from "react";
import { createRoot } from "react-dom/client";
import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
import type { Project } from "@paperclipai/shared";
import {
  buildCreatePayload,
  usePromoteToProject,
  type BrainstormerPayload,
  type PromoteState,
  type UsePromoteToProjectResult,
} from "./usePromoteToProject";

// eslint-disable-next-line @typescript-eslint/no-explicit-any
(globalThis as any).IS_REACT_ACT_ENVIRONMENT = true;

function fakeProject(overrides: Partial<Project> = {}): Project {
  return {
    id: "proj-xyz",
    companyId: "co-1",
    urlKey: "my-new-project",
    goalId: null,
    goalIds: [],
    goals: [],
    name: "My New Project",
    description: null,
    status: "planned",
    leadAgentId: null,
    targetDate: null,
    color: null,
    pauseReason: null,
    pausedAt: null,
    executionWorkspacePolicy: null,
    codebase: { kind: "none" } as unknown as Project["codebase"],
    workspaces: [],
    primaryWorkspace: null,
    archivedAt: null,
    createdAt: new Date(),
    updatedAt: new Date(),
    ...overrides,
  } as Project;
}

// Harness: render a tiny component that calls the hook so we can drive it
// from tests via a ref. Keeps us in the Phase 8 createRoot+act pattern and
// avoids @testing-library/react-hooks (not installed).
function makeHarness() {
  const container = document.createElement("div");
  document.body.appendChild(container);
  const root = createRoot(container);

  let current: UsePromoteToProjectResult | null = null;

  function Probe(props: {
    conversationId: string | null;
    companyId: string | null;
    createProject?: (
      companyId: string,
      data: Record<string, unknown>,
    ) => Promise<Project>;
  }) {
    current = usePromoteToProject({
      conversationId: props.conversationId,
      companyId: props.companyId,
      createProject: props.createProject,
    });
    return null;
  }

  function render(props: Parameters<typeof Probe>[0]) {
    act(() => {
      root.render(createElement(Probe, props));
    });
  }

  function unmount() {
    act(() => {
      root.unmount();
    });
    if (container.parentNode) container.remove();
  }

  return {
    render,
    unmount,
    get hook() {
      if (!current) throw new Error("Hook not rendered yet");
      return current;
    },
    getState(): PromoteState {
      return current!.state;
    },
  };
}

describe("usePromoteToProject", () => {
  let harness: ReturnType<typeof makeHarness>;

  beforeEach(() => {
    harness = makeHarness();
  });

  afterEach(() => {
    harness.unmount();
  });

  const payload: BrainstormerPayload = {
    goal: "Ship nexus phase 12",
    acceptanceCriteria: ["animation ≤ 700ms", "ESC cancels"],
    gates: ["pm-review"],
    engineerTemplateId: undefined,
  };

  it("starts in idle state", () => {
    harness.render({ conversationId: "c-1", companyId: "co-1" });
    expect(harness.getState()).toEqual({ kind: "idle" });
  });

  it("transitions idle → prompting on startPrompting()", () => {
    harness.render({ conversationId: "c-1", companyId: "co-1" });
    act(() => harness.hook.startPrompting());
    expect(harness.getState()).toEqual({ kind: "prompting", conversationId: "c-1" });
  });

  it("does not transition when conversationId is null", () => {
    harness.render({ conversationId: null, companyId: "co-1" });
    act(() => harness.hook.startPrompting());
    expect(harness.getState()).toEqual({ kind: "idle" });
  });

  it("transitions prompting → creating → done on successful confirm()", async () => {
    const createProject = vi.fn().mockResolvedValue(
      fakeProject({ id: "proj-7", urlKey: "nexus-phase-12", name: "Nexus Phase 12" }),
    );
    harness.render({ conversationId: "c-1", companyId: "co-1", createProject });
    act(() => harness.hook.startPrompting());

    await act(async () => {
      await harness.hook.confirm(payload);
    });

    expect(createProject).toHaveBeenCalledTimes(1);
    const [calledCompany, calledBody] = createProject.mock.calls[0]!;
    expect(calledCompany).toBe("co-1");
    expect(calledBody).toMatchObject({
      name: "Ship nexus phase 12",
      description: "Ship nexus phase 12",
      status: "planned",
      originConversationId: "c-1",
      brainstormer: {
        goal: "Ship nexus phase 12",
        acceptanceCriteria: ["animation ≤ 700ms", "ESC cancels"],
        gates: ["pm-review"],
      },
    });

    expect(harness.getState()).toEqual({
      kind: "done",
      projectId: "proj-7",
      projectSlug: "nexus-phase-12",
      projectName: "Nexus Phase 12",
    });
  });

  it("transitions to error state when createProject rejects", async () => {
    const createProject = vi.fn().mockRejectedValue(new Error("boom"));
    harness.render({ conversationId: "c-1", companyId: "co-1", createProject });
    act(() => harness.hook.startPrompting());

    await act(async () => {
      await harness.hook.confirm(payload);
    });

    expect(harness.getState()).toEqual({ kind: "error", message: "boom" });
  });

  it("cancel() returns to idle from prompting", () => {
    harness.render({ conversationId: "c-1", companyId: "co-1" });
    act(() => harness.hook.startPrompting());
    expect(harness.getState().kind).toBe("prompting");
    act(() => harness.hook.cancel());
    expect(harness.getState()).toEqual({ kind: "idle" });
  });

  it("refuses confirm() when companyId is null", async () => {
    const createProject = vi.fn();
    harness.render({ conversationId: "c-1", companyId: null, createProject });
    act(() => harness.hook.startPrompting());
    await act(async () => {
      await harness.hook.confirm(payload);
    });
    expect(createProject).not.toHaveBeenCalled();
    expect(harness.getState().kind).toBe("error");
  });
});

describe("buildCreatePayload", () => {
  it("derives name from the first 60 chars of goal first line", () => {
    const body = buildCreatePayload(
      {
        goal: "Rewrite the promote flow\nwith animated transitions",
        acceptanceCriteria: [],
        gates: [],
      },
      "conv-1",
    );
    expect(body.name).toBe("Rewrite the promote flow");
  });

  it("falls back to 'Untitled project' when goal is empty", () => {
    const body = buildCreatePayload(
      { goal: "", acceptanceCriteria: [], gates: [] },
      "conv-1",
    );
    expect(body.name).toBe("Untitled project");
    expect(body.description).toBeUndefined();
  });

  it("truncates goal first line to 60 chars", () => {
    const longLine = "a".repeat(120);
    const body = buildCreatePayload(
      { goal: longLine, acceptanceCriteria: [], gates: [] },
      "conv-1",
    );
    expect((body.name as string).length).toBe(60);
  });

  it("includes brainstormer metadata under brainstormer key", () => {
    const body = buildCreatePayload(
      {
        goal: "G",
        acceptanceCriteria: ["a", "b"],
        gates: ["pm-review"],
        engineerTemplateId: "tpl-1",
      },
      "conv-2",
    );
    expect(body.brainstormer).toEqual({
      goal: "G",
      acceptanceCriteria: ["a", "b"],
      gates: ["pm-review"],
      engineerTemplateId: "tpl-1",
    });
    expect(body.originConversationId).toBe("conv-2");
  });
});