import { describe, it, expect, vi } from "vitest";

import { getComboModelsFromData, discardResponse, handleFusionChat } from "../../open-sse/services/combo.js";
import { tokensForDetail, shouldPersistRequestDetail } from "../../open-sse/handlers/chatCore/requestDetail.js";

vi.mock("@/lib/usageDb.js", () => ({
  saveRequestUsage: vi.fn(),
  saveRequestDetail: vi.fn(),
}));
vi.mock("../../open-sse/utils/stream.js", () => ({
  COLORS: {},
  formatSSE: vi.fn(),
}));

const log = { info: () => {}, warn: () => {}, debug: () => {} };

describe("nested combo members stay units", () => {
  it("keeps comboB as a member of comboA (does not flatten leaves into the parent)", () => {
    const combos = [
      { name: "comboA", models: ["comboB", "comboC", "x/y"] },
      { name: "comboB", models: ["a/m1", "b/m2"] },
      { name: "comboC", models: ["c/m3"] },
    ];
    expect(getComboModelsFromData("comboA", combos)).toEqual(["comboB", "comboC", "x/y"]);
  });

  it("returns null for a plain provider/model string", () => {
    expect(getComboModelsFromData("openai/gpt-4", [{ name: "comboA", models: ["a/m1"] }])).toBeNull();
  });

  it("still returns direct members of a top-level combo", () => {
    const combos = [{ name: "solo", models: ["a/m1", "b/m2"] }];
    expect(getComboModelsFromData("solo", combos)).toEqual(["a/m1", "b/m2"]);
  });

  it("ignores a disabled combo", () => {
    const combos = [{ name: "solo", enabled: false, models: ["a/m1"] }];
    expect(getComboModelsFromData("solo", combos)).toBeNull();
  });
});

describe("shouldPersistRequestDetail", () => {
  it("never persists the streaming-start placeholder (0-token fake success)", () => {
    expect(shouldPersistRequestDetail("all", "streaming-start")).toBe(false);
    expect(shouldPersistRequestDetail("success-only", "streaming-start")).toBe(false);
  });

  it("combo hops skip failed attempts so nested fallback does not inflate Details", () => {
    expect(shouldPersistRequestDetail("success-only", "error")).toBe(false);
    expect(shouldPersistRequestDetail("success-only", "success")).toBe(true);
  });

  it("direct (non-combo) requests still persist errors", () => {
    expect(shouldPersistRequestDetail("all", "error")).toBe(true);
    expect(shouldPersistRequestDetail("all", "success")).toBe(true);
  });
});

describe("tokensForDetail", () => {
  it("canonicalizes Claude input_tokens/output_tokens so the Details tab is not 0/0", () => {
    expect(tokensForDetail({ input_tokens: 120, output_tokens: 40 })).toEqual(
      expect.objectContaining({ prompt_tokens: 120, completion_tokens: 40 }),
    );
  });

  it("keeps OpenAI prompt/completion names", () => {
    expect(tokensForDetail({ prompt_tokens: 10, completion_tokens: 3 })).toEqual(
      expect.objectContaining({ prompt_tokens: 10, completion_tokens: 3 }),
    );
  });

  it("returns zeros for missing usage (streaming placeholder)", () => {
    expect(tokensForDetail(null)).toEqual({ prompt_tokens: 0, completion_tokens: 0 });
  });
});

describe("discardResponse", () => {
  it("cancels an unused body so a dropped stream can finish", () => {
    const cancel = vi.fn();
    discardResponse({ body: { cancel } });
    expect(cancel).toHaveBeenCalledTimes(1);
  });

  it("is a no-op for timeout/error sentinels and missing bodies", () => {
    expect(() => discardResponse({ __timeout: true, body: { cancel: () => { throw new Error("no"); } } })).not.toThrow();
    expect(() => discardResponse(null)).not.toThrow();
  });
});

describe("fusion cancels unused panel bodies", () => {
  it("cancels a late panel Response so it is not left as a 0-token streaming row", async () => {
    const cancel = vi.fn();
    const ok = (content) => {
      const json = { choices: [{ message: { role: "assistant", content } }] };
      const make = () => ({ ok: true, status: 200, clone: make, json: async () => json });
      return make();
    };
    const slow = () => new Promise((resolve) => {
      setTimeout(() => {
        resolve({
          ok: true,
          status: 200,
          body: { cancel },
          clone() { return this; },
          json: async () => ({ choices: [{ message: { content: "late" } }] }),
        });
      }, 40);
    });

    const handleSingleModel = vi.fn(async (_body, model) => {
      if (model === "p/slow") return slow();
      if (model === "p/judge") return ok("FINAL");
      return ok(`ans-${model}`);
    });

    await handleFusionChat({
      body: { messages: [{ role: "user", content: "Q" }] },
      models: ["p/a", "p/b", "p/slow"],
      handleSingleModel,
      log,
      judgeModel: "p/judge",
      tuning: { minPanel: 2, stragglerGraceMs: 1, panelHardTimeoutMs: 200 },
    });

    await new Promise((r) => setTimeout(r, 80));
    expect(cancel).toHaveBeenCalled();
  });
});