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

import type { ClawdbotConfig } from "../config/config.js";
import { resolveUserPath } from "../utils.js";
import { createCacheTrace } from "./cache-trace.js";

describe("createCacheTrace", () => {
  it("returns null when diagnostics cache tracing is disabled", () => {
    const trace = createCacheTrace({
      cfg: {} as ClawdbotConfig,
      env: {},
    });

    expect(trace).toBeNull();
  });

  it("honors diagnostics cache trace config and expands file paths", () => {
    const lines: string[] = [];
    const trace = createCacheTrace({
      cfg: {
        diagnostics: {
          cacheTrace: {
            enabled: true,
            filePath: "~/.clawdbot/logs/cache-trace.jsonl",
          },
        },
      },
      env: {},
      writer: {
        filePath: "memory",
        write: (line) => lines.push(line),
      },
    });

    expect(trace).not.toBeNull();
    expect(trace?.filePath).toBe(resolveUserPath("~/.clawdbot/logs/cache-trace.jsonl"));

    trace?.recordStage("session:loaded", {
      messages: [],
      system: "sys",
    });

    expect(lines.length).toBe(1);
  });

  it("records empty prompt/system values when enabled", () => {
    const lines: string[] = [];
    const trace = createCacheTrace({
      cfg: {
        diagnostics: {
          cacheTrace: {
            enabled: true,
            includePrompt: true,
            includeSystem: true,
          },
        },
      },
      env: {},
      writer: {
        filePath: "memory",
        write: (line) => lines.push(line),
      },
    });

    trace?.recordStage("prompt:before", { prompt: "", system: "" });

    const event = JSON.parse(lines[0]?.trim() ?? "{}") as Record<string, unknown>;
    expect(event.prompt).toBe("");
    expect(event.system).toBe("");
  });

  it("respects env overrides for enablement", () => {
    const lines: string[] = [];
    const trace = createCacheTrace({
      cfg: {
        diagnostics: {
          cacheTrace: {
            enabled: true,
          },
        },
      },
      env: {
        CLAWDBOT_CACHE_TRACE: "0",
      },
      writer: {
        filePath: "memory",
        write: (line) => lines.push(line),
      },
    });

    expect(trace).toBeNull();
  });
});