// P0 GOLDEN: lock OUTPUT của translateResponse (stream) cho các concern đặc biệt.
// Feed chuỗi chunk THẬT (shape provider) → snapshot mảng chunk openai emit.
// Sau refactor chạy lại phải khớp y hệt (chunk/usage/thinking/tool/finish).
import { describe, it, expect } from "vitest";
import "./registerAll.js";
import { translateResponse, initState } from "../../open-sse/translator/index.js";
import { FORMATS } from "../../open-sse/translator/formats.js";

// Chuẩn hoá field động (Date.now trong created + gemini tool id) để snapshot ổn định.
function stripVolatile(chunks) {
  return JSON.parse(JSON.stringify(chunks), (key, val) => {
    if (key === "created") return 0;
    // gemini sinh id = `${name}-${Date.now()}-${idx}` → chuẩn hoá phần timestamp
    if (key === "id" && typeof val === "string") return val.replace(/-\d{10,}-(\d+)$/, "-<TS>-$1");
    return val;
  });
}

// Chạy 1 chuỗi event qua translateResponse, gom toàn bộ chunk emit.
function runStream(targetFormat, sourceFormat, events) {
  const state = initState(sourceFormat);
  const all = [];
  for (const ev of events) {
    const out = translateResponse(targetFormat, sourceFormat, ev, state);
    if (Array.isArray(out)) all.push(...out);
    else if (out) all.push(out);
  }
  return stripVolatile(all);
}

describe("GOLDEN response stream: Claude → OpenAI", () => {
  it("text + thinking + tool_use + usage + finish", () => {
    const events = [
      { type: "message_start", message: { id: "msg_1", model: "claude-opus-4-6" } },
      { type: "content_block_start", index: 0, content_block: { type: "thinking" } },
      { type: "content_block_delta", index: 0, delta: { type: "thinking_delta", thinking: "let me think" } },
      { type: "content_block_stop", index: 0 },
      { type: "content_block_start", index: 1, content_block: { type: "text" } },
      { type: "content_block_delta", index: 1, delta: { type: "text_delta", text: "Hello" } },
      { type: "content_block_stop", index: 1 },
      { type: "content_block_start", index: 2, content_block: { type: "tool_use", id: "tu_1", name: "get_weather" } },
      { type: "content_block_delta", index: 2, delta: { type: "input_json_delta", partial_json: '{"city":"NYC"}' } },
      { type: "content_block_stop", index: 2 },
      { type: "message_delta", delta: { stop_reason: "tool_use" }, usage: { input_tokens: 10, output_tokens: 5, cache_read_input_tokens: 3 } },
      { type: "message_stop" },
    ];
    expect(runStream(FORMATS.CLAUDE, FORMATS.OPENAI, events)).toMatchSnapshot();
  });
});

describe("GOLDEN response stream: Gemini → OpenAI", () => {
  it("text + thought(no-sig) + functionCall + usage + finish", () => {
    const events = [
      { candidates: [{ content: { parts: [{ text: "thinking part", thought: true }] } }], responseId: "resp_1", modelVersion: "gemini-3-pro" },
      { candidates: [{ content: { parts: [{ text: "Answer" }] } }] },
      { candidates: [{ content: { parts: [{ functionCall: { name: "search", args: { q: "x" } } }] } }] },
      { candidates: [{ finishReason: "STOP" }], usageMetadata: { promptTokenCount: 8, candidatesTokenCount: 4, thoughtsTokenCount: 2, totalTokenCount: 14, cachedContentTokenCount: 1 } },
    ];
    expect(runStream(FORMATS.GEMINI, FORMATS.OPENAI, events)).toMatchSnapshot();
  });

  it("image output (inlineData → delta.images)", () => {
    const events = [
      { candidates: [{ content: { parts: [{ inlineData: { mimeType: "image/png", data: "BASE64DATA" } }] } }], responseId: "resp_2", modelVersion: "gemini-3-flash-image" },
      { candidates: [{ finishReason: "STOP" }] },
    ];
    expect(runStream(FORMATS.GEMINI, FORMATS.OPENAI, events)).toMatchSnapshot();
  });
});