import crypto from "node:crypto";
import { describe, expect, it } from "vitest";
import type { OpenClawConfig } 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 OpenClawConfig,
      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: "~/.openclaw/logs/cache-trace.jsonl",
          },
        },
      },
      env: {},
      writer: {
        filePath: "memory",
        write: (line) => lines.push(line),
      },
    });

    expect(trace).not.toBeNull();
    expect(trace?.filePath).toBe(resolveUserPath("~/.openclaw/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: {
        OPENCLAW_CACHE_TRACE: "0",
      },
      writer: {
        filePath: "memory",
        write: (line) => lines.push(line),
      },
    });

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

  it("redacts image data from options and messages before writing", () => {
    const lines: string[] = [];
    const trace = createCacheTrace({
      cfg: {
        diagnostics: {
          cacheTrace: {
            enabled: true,
          },
        },
      },
      env: {},
      writer: {
        filePath: "memory",
        write: (line) => lines.push(line),
      },
    });

    trace?.recordStage("stream:context", {
      options: {
        images: [{ type: "image", mimeType: "image/png", data: "QUJDRA==" }],
      },
      messages: [
        {
          role: "user",
          content: [
            {
              type: "image",
              source: { type: "base64", media_type: "image/jpeg", data: "U0VDUkVU" },
            },
          ],
        },
      ] as unknown as [],
    });

    const event = JSON.parse(lines[0]?.trim() ?? "{}") as Record<string, unknown>;
    const optionsImages = (
      ((event.options as { images?: unknown[] } | undefined)?.images ?? []) as Array<
        Record<string, unknown>
      >
    )[0];
    expect(optionsImages?.data).toBe("<redacted>");
    expect(optionsImages?.bytes).toBe(4);
    expect(optionsImages?.sha256).toBe(
      crypto.createHash("sha256").update("QUJDRA==").digest("hex"),
    );

    const firstMessage = ((event.messages as Array<Record<string, unknown>> | undefined) ?? [])[0];
    const source = (((firstMessage?.content as Array<Record<string, unknown>> | undefined) ?? [])[0]
      ?.source ?? {}) as Record<string, unknown>;
    expect(source.data).toBe("<redacted>");
    expect(source.bytes).toBe(6);
    expect(source.sha256).toBe(crypto.createHash("sha256").update("U0VDUkVU").digest("hex"));
  });

  it("handles circular references in messages without stack overflow", () => {
    const lines: string[] = [];
    const trace = createCacheTrace({
      cfg: {
        diagnostics: {
          cacheTrace: {
            enabled: true,
          },
        },
      },
      env: {},
      writer: {
        filePath: "memory",
        write: (line) => lines.push(line),
      },
    });

    const parent: Record<string, unknown> = { role: "user", content: "hello" };
    const child: Record<string, unknown> = { ref: parent };
    parent.child = child; // circular reference

    trace?.recordStage("prompt:images", {
      messages: [parent] as unknown as [],
    });

    expect(lines.length).toBe(1);
    const event = JSON.parse(lines[0]?.trim() ?? "{}") as Record<string, unknown>;
    expect(event.messageCount).toBe(1);
    expect(event.messageFingerprints).toHaveLength(1);
  });
});