import fs from "node:fs";
import os from "node:os";
import path from "node:path";
import { afterAll, afterEach, beforeAll, describe, expect, test, vi } from "vitest";
import { createToolSummaryPreviewTranscriptLines } from "./session-preview.test-helpers.js";
import {
  archiveSessionTranscripts,
  readFirstUserMessageFromTranscript,
  readLastMessagePreviewFromTranscript,
  readLatestSessionUsageFromTranscript,
  readSessionMessages,
  readSessionTitleFieldsFromTranscript,
  readSessionPreviewItemsFromTranscript,
  resolveSessionTranscriptCandidates,
} from "./session-utils.fs.js";

function registerTempSessionStore(
  prefix: string,
  assignPaths: (tmpDir: string, storePath: string) => void,
) {
  let dir = "";
  beforeAll(() => {
    dir = fs.mkdtempSync(path.join(os.tmpdir(), prefix));
    assignPaths(dir, path.join(dir, "sessions.json"));
  });
  afterAll(() => {
    if (dir) {
      fs.rmSync(dir, { recursive: true, force: true });
    }
  });
}

function writeTranscript(tmpDir: string, sessionId: string, lines: unknown[]): string {
  const transcriptPath = path.join(tmpDir, `${sessionId}.jsonl`);
  fs.writeFileSync(transcriptPath, lines.map((line) => JSON.stringify(line)).join("\n"), "utf-8");
  return transcriptPath;
}

function buildBasicSessionTranscript(
  sessionId: string,
  userText = "Hello world",
  assistantText = "Hi there",
): unknown[] {
  return [
    { type: "session", version: 1, id: sessionId },
    { message: { role: "user", content: userText } },
    { message: { role: "assistant", content: assistantText } },
  ];
}

describe("readFirstUserMessageFromTranscript", () => {
  let tmpDir: string;
  let storePath: string;

  registerTempSessionStore("openclaw-session-fs-test-", (nextTmpDir, nextStorePath) => {
    tmpDir = nextTmpDir;
    storePath = nextStorePath;
  });

  test.each([
    {
      sessionId: "test-session-1",
      lines: [
        JSON.stringify({ type: "session", version: 1, id: "test-session-1" }),
        JSON.stringify({ message: { role: "user", content: "Hello world" } }),
        JSON.stringify({ message: { role: "assistant", content: "Hi there" } }),
      ],
      expected: "Hello world",
    },
    {
      sessionId: "test-session-2",
      lines: [
        JSON.stringify({ type: "session", version: 1, id: "test-session-2" }),
        JSON.stringify({
          message: {
            role: "user",
            content: [{ type: "text", text: "Array message content" }],
          },
        }),
      ],
      expected: "Array message content",
    },
    {
      sessionId: "test-session-2b",
      lines: [
        JSON.stringify({ type: "session", version: 1, id: "test-session-2b" }),
        JSON.stringify({
          message: {
            role: "user",
            content: [{ type: "input_text", text: "Input text content" }],
          },
        }),
      ],
      expected: "Input text content",
    },
  ] as const)("extracts first user text for $sessionId", ({ sessionId, lines, expected }) => {
    const transcriptPath = path.join(tmpDir, `${sessionId}.jsonl`);
    fs.writeFileSync(transcriptPath, lines.join("\n"), "utf-8");
    const result = readFirstUserMessageFromTranscript(sessionId, storePath);
    expect(result, sessionId).toBe(expected);
  });
  test("skips non-user messages to find first user message", () => {
    const sessionId = "test-session-3";
    const transcriptPath = path.join(tmpDir, `${sessionId}.jsonl`);
    const lines = [
      JSON.stringify({ type: "session", version: 1, id: sessionId }),
      JSON.stringify({ message: { role: "system", content: "System prompt" } }),
      JSON.stringify({ message: { role: "assistant", content: "Greeting" } }),
      JSON.stringify({ message: { role: "user", content: "First user question" } }),
    ];
    fs.writeFileSync(transcriptPath, lines.join("\n"), "utf-8");

    const result = readFirstUserMessageFromTranscript(sessionId, storePath);
    expect(result).toBe("First user question");
  });

  test("skips inter-session user messages by default", () => {
    const sessionId = "test-session-inter-session";
    const transcriptPath = path.join(tmpDir, `${sessionId}.jsonl`);
    const lines = [
      JSON.stringify({
        message: {
          role: "user",
          content: "Forwarded by session tool",
          provenance: { kind: "inter_session", sourceTool: "sessions_send" },
        },
      }),
      JSON.stringify({
        message: { role: "user", content: "Real user message" },
      }),
    ];
    fs.writeFileSync(transcriptPath, lines.join("\n"), "utf-8");

    const result = readFirstUserMessageFromTranscript(sessionId, storePath);
    expect(result).toBe("Real user message");
  });

  test("returns null when no user messages exist", () => {
    const sessionId = "test-session-4";
    const transcriptPath = path.join(tmpDir, `${sessionId}.jsonl`);
    const lines = [
      JSON.stringify({ type: "session", version: 1, id: sessionId }),
      JSON.stringify({ message: { role: "system", content: "System prompt" } }),
      JSON.stringify({ message: { role: "assistant", content: "Greeting" } }),
    ];
    fs.writeFileSync(transcriptPath, lines.join("\n"), "utf-8");

    const result = readFirstUserMessageFromTranscript(sessionId, storePath);
    expect(result).toBeNull();
  });

  test("handles malformed JSON lines gracefully", () => {
    const sessionId = "test-session-5";
    const transcriptPath = path.join(tmpDir, `${sessionId}.jsonl`);
    const lines = [
      "not valid json",
      JSON.stringify({ message: { role: "user", content: "Valid message" } }),
    ];
    fs.writeFileSync(transcriptPath, lines.join("\n"), "utf-8");

    const result = readFirstUserMessageFromTranscript(sessionId, storePath);
    expect(result).toBe("Valid message");
  });

  test("returns null for empty content", () => {
    const sessionId = "test-session-8";
    const transcriptPath = path.join(tmpDir, `${sessionId}.jsonl`);
    const lines = [
      JSON.stringify({ message: { role: "user", content: "" } }),
      JSON.stringify({ message: { role: "user", content: "Second message" } }),
    ];
    fs.writeFileSync(transcriptPath, lines.join("\n"), "utf-8");

    const result = readFirstUserMessageFromTranscript(sessionId, storePath);
    expect(result).toBe("Second message");
  });
});

describe("readLastMessagePreviewFromTranscript", () => {
  let tmpDir: string;
  let storePath: string;

  registerTempSessionStore("openclaw-session-fs-test-", (nextTmpDir, nextStorePath) => {
    tmpDir = nextTmpDir;
    storePath = nextStorePath;
  });

  test("returns null for empty file", () => {
    const sessionId = "test-last-empty";
    const transcriptPath = path.join(tmpDir, `${sessionId}.jsonl`);
    fs.writeFileSync(transcriptPath, "", "utf-8");

    const result = readLastMessagePreviewFromTranscript(sessionId, storePath);
    expect(result).toBeNull();
  });

  test.each([
    {
      sessionId: "test-last-user",
      lines: [
        JSON.stringify({ message: { role: "user", content: "First user" } }),
        JSON.stringify({ message: { role: "assistant", content: "First assistant" } }),
        JSON.stringify({ message: { role: "user", content: "Last user message" } }),
      ],
      expected: "Last user message",
    },
    {
      sessionId: "test-last-assistant",
      lines: [
        JSON.stringify({ message: { role: "user", content: "User question" } }),
        JSON.stringify({ message: { role: "assistant", content: "Final assistant reply" } }),
      ],
      expected: "Final assistant reply",
    },
  ] as const)(
    "returns the last user or assistant message from transcript for $sessionId",
    ({ sessionId, lines, expected }) => {
      const transcriptPath = path.join(tmpDir, `${sessionId}.jsonl`);
      fs.writeFileSync(transcriptPath, lines.join("\n"), "utf-8");
      const result = readLastMessagePreviewFromTranscript(sessionId, storePath);
      expect(result).toBe(expected);
    },
  );

  test("skips system messages to find last user/assistant", () => {
    const sessionId = "test-last-skip-system";
    const transcriptPath = path.join(tmpDir, `${sessionId}.jsonl`);
    const lines = [
      JSON.stringify({ message: { role: "user", content: "Real last" } }),
      JSON.stringify({ message: { role: "system", content: "System at end" } }),
    ];
    fs.writeFileSync(transcriptPath, lines.join("\n"), "utf-8");

    const result = readLastMessagePreviewFromTranscript(sessionId, storePath);
    expect(result).toBe("Real last");
  });

  test("returns null when no user/assistant messages exist", () => {
    const sessionId = "test-last-no-match";
    const transcriptPath = path.join(tmpDir, `${sessionId}.jsonl`);
    const lines = [
      JSON.stringify({ type: "session", version: 1, id: sessionId }),
      JSON.stringify({ message: { role: "system", content: "Only system" } }),
    ];
    fs.writeFileSync(transcriptPath, lines.join("\n"), "utf-8");

    const result = readLastMessagePreviewFromTranscript(sessionId, storePath);
    expect(result).toBeNull();
  });

  test("handles malformed JSON lines gracefully (last preview)", () => {
    const sessionId = "test-last-malformed";
    const transcriptPath = path.join(tmpDir, `${sessionId}.jsonl`);
    const lines = [
      JSON.stringify({ message: { role: "user", content: "Valid first" } }),
      "not valid json at end",
    ];
    fs.writeFileSync(transcriptPath, lines.join("\n"), "utf-8");

    const result = readLastMessagePreviewFromTranscript(sessionId, storePath);
    expect(result).toBe("Valid first");
  });

  test.each([
    {
      sessionId: "test-last-array",
      message: {
        role: "assistant",
        content: [{ type: "text", text: "Array content response" }],
      },
      expected: "Array content response",
    },
    {
      sessionId: "test-last-output-text",
      message: {
        role: "assistant",
        content: [{ type: "output_text", text: "Output text response" }],
      },
      expected: "Output text response",
    },
  ] as const)(
    "handles array/output_text content format for $sessionId",
    ({ sessionId, message, expected }) => {
      const transcriptPath = path.join(tmpDir, `${sessionId}.jsonl`);
      fs.writeFileSync(transcriptPath, JSON.stringify({ message }), "utf-8");
      const result = readLastMessagePreviewFromTranscript(sessionId, storePath);
      expect(result, sessionId).toBe(expected);
    },
  );

  test("skips empty content to find previous message", () => {
    const sessionId = "test-last-skip-empty";
    const transcriptPath = path.join(tmpDir, `${sessionId}.jsonl`);
    const lines = [
      JSON.stringify({ message: { role: "assistant", content: "Has content" } }),
      JSON.stringify({ message: { role: "user", content: "" } }),
    ];
    fs.writeFileSync(transcriptPath, lines.join("\n"), "utf-8");

    const result = readLastMessagePreviewFromTranscript(sessionId, storePath);
    expect(result).toBe("Has content");
  });

  test("reads from end of large file (16KB window)", () => {
    const sessionId = "test-last-large";
    const transcriptPath = path.join(tmpDir, `${sessionId}.jsonl`);
    const padding = JSON.stringify({ message: { role: "user", content: "x".repeat(500) } });
    const lines: string[] = [];
    for (let i = 0; i < 30; i++) {
      lines.push(padding);
    }
    lines.push(JSON.stringify({ message: { role: "assistant", content: "Last in large file" } }));
    fs.writeFileSync(transcriptPath, lines.join("\n"), "utf-8");

    const result = readLastMessagePreviewFromTranscript(sessionId, storePath);
    expect(result).toBe("Last in large file");
  });

  test("handles valid UTF-8 content", () => {
    const sessionId = "test-last-utf8";
    const transcriptPath = path.join(tmpDir, `${sessionId}.jsonl`);
    const validLine = JSON.stringify({
      message: { role: "user", content: "Valid UTF-8: 你好世界 🌍" },
    });
    fs.writeFileSync(transcriptPath, validLine, "utf-8");

    const result = readLastMessagePreviewFromTranscript(sessionId, storePath);
    expect(result).toBe("Valid UTF-8: 你好世界 🌍");
  });

  test("strips inline directives from last preview text", () => {
    const sessionId = "test-last-strip-inline-directives";
    const transcriptPath = path.join(tmpDir, `${sessionId}.jsonl`);
    const lines = [
      JSON.stringify({
        message: {
          role: "assistant",
          content: "Hello [[reply_to_current]] world [[audio_as_voice]]",
        },
      }),
    ];
    fs.writeFileSync(transcriptPath, lines.join("\n"), "utf-8");

    const result = readLastMessagePreviewFromTranscript(sessionId, storePath);
    expect(result).toBe("Hello  world");
  });
});

describe("shared transcript read behaviors", () => {
  let tmpDir: string;
  let storePath: string;

  registerTempSessionStore("openclaw-session-fs-test-", (nextTmpDir, nextStorePath) => {
    tmpDir = nextTmpDir;
    storePath = nextStorePath;
  });

  test("returns null for missing transcript files", () => {
    expect(readFirstUserMessageFromTranscript("missing-session", storePath)).toBeNull();
    expect(readLastMessagePreviewFromTranscript("missing-session", storePath)).toBeNull();
  });

  test("uses sessionFile overrides when provided", () => {
    const sessionId = "test-shared-custom";
    const firstPath = path.join(tmpDir, "custom-first.jsonl");
    const lastPath = path.join(tmpDir, "custom-last.jsonl");

    fs.writeFileSync(
      firstPath,
      [
        JSON.stringify({ type: "session", version: 1, id: sessionId }),
        JSON.stringify({ message: { role: "user", content: "Custom file message" } }),
      ].join("\n"),
      "utf-8",
    );
    fs.writeFileSync(
      lastPath,
      JSON.stringify({ message: { role: "assistant", content: "Custom file last" } }),
      "utf-8",
    );

    expect(readFirstUserMessageFromTranscript(sessionId, storePath, firstPath)).toBe(
      "Custom file message",
    );
    expect(readLastMessagePreviewFromTranscript(sessionId, storePath, lastPath)).toBe(
      "Custom file last",
    );
  });

  test("trims whitespace in extracted previews", () => {
    const firstSessionId = "test-shared-first-trim";
    const lastSessionId = "test-shared-last-trim";

    fs.writeFileSync(
      path.join(tmpDir, `${firstSessionId}.jsonl`),
      JSON.stringify({ message: { role: "user", content: "  Padded message  " } }),
      "utf-8",
    );
    fs.writeFileSync(
      path.join(tmpDir, `${lastSessionId}.jsonl`),
      JSON.stringify({ message: { role: "assistant", content: "  Padded response  " } }),
      "utf-8",
    );

    expect(readFirstUserMessageFromTranscript(firstSessionId, storePath)).toBe("Padded message");
    expect(readLastMessagePreviewFromTranscript(lastSessionId, storePath)).toBe("Padded response");
  });
});

describe("readSessionTitleFieldsFromTranscript cache", () => {
  let tmpDir: string;
  let storePath: string;

  registerTempSessionStore("openclaw-session-fs-test-", (nextTmpDir, nextStorePath) => {
    tmpDir = nextTmpDir;
    storePath = nextStorePath;
  });

  test("returns cached values without re-reading when unchanged", () => {
    const sessionId = "test-cache-1";
    writeTranscript(tmpDir, sessionId, buildBasicSessionTranscript(sessionId));

    const readSpy = vi.spyOn(fs, "readSync");

    const first = readSessionTitleFieldsFromTranscript(sessionId, storePath);
    const readsAfterFirst = readSpy.mock.calls.length;
    expect(readsAfterFirst).toBeGreaterThan(0);

    const second = readSessionTitleFieldsFromTranscript(sessionId, storePath);
    expect(second).toEqual(first);
    expect(readSpy.mock.calls.length).toBe(readsAfterFirst);
    readSpy.mockRestore();
  });

  test("invalidates cache when transcript changes", () => {
    const sessionId = "test-cache-2";
    const transcriptPath = writeTranscript(
      tmpDir,
      sessionId,
      buildBasicSessionTranscript(sessionId, "First", "Old"),
    );

    const readSpy = vi.spyOn(fs, "readSync");

    const first = readSessionTitleFieldsFromTranscript(sessionId, storePath);
    const readsAfterFirst = readSpy.mock.calls.length;
    expect(first.lastMessagePreview).toBe("Old");

    fs.appendFileSync(
      transcriptPath,
      `\n${JSON.stringify({ message: { role: "assistant", content: "New" } })}`,
      "utf-8",
    );

    const second = readSessionTitleFieldsFromTranscript(sessionId, storePath);
    expect(second.lastMessagePreview).toBe("New");
    expect(readSpy.mock.calls.length).toBeGreaterThan(readsAfterFirst);
    readSpy.mockRestore();
  });
});

describe("readSessionMessages", () => {
  let tmpDir: string;
  let storePath: string;

  registerTempSessionStore("openclaw-session-fs-test-", (nextTmpDir, nextStorePath) => {
    tmpDir = nextTmpDir;
    storePath = nextStorePath;
  });

  test("includes synthetic compaction markers for compaction entries", () => {
    const sessionId = "test-session-compaction";
    const transcriptPath = path.join(tmpDir, `${sessionId}.jsonl`);
    const lines = [
      JSON.stringify({ type: "session", version: 1, id: sessionId }),
      JSON.stringify({ message: { role: "user", content: "Hello" } }),
      JSON.stringify({
        type: "compaction",
        id: "comp-1",
        timestamp: "2026-02-07T00:00:00.000Z",
        summary: "Compacted history",
        firstKeptEntryId: "x",
        tokensBefore: 123,
      }),
      JSON.stringify({ message: { role: "assistant", content: "World" } }),
    ];
    fs.writeFileSync(transcriptPath, lines.join("\n"), "utf-8");

    const out = readSessionMessages(sessionId, storePath);
    expect(out).toHaveLength(3);
    const marker = out[1] as {
      role: string;
      content?: Array<{ text?: string }>;
      __openclaw?: { kind?: string; id?: string };
      timestamp?: number;
    };
    expect(marker.role).toBe("system");
    expect(marker.content?.[0]?.text).toBe("Compaction");
    expect(marker.__openclaw?.kind).toBe("compaction");
    expect(marker.__openclaw?.id).toBe("comp-1");
    expect(typeof marker.timestamp).toBe("number");
  });

  test.each([
    {
      sessionId: "cross-agent-default-root",
      sessionFileParts: ["agents", "ops", "sessions", "cross-agent-default-root.jsonl"],
      wrongStorePathParts: ["agents", "main", "sessions", "sessions.json"],
      message: { role: "user", content: "from-ops" },
    },
    {
      sessionId: "cross-agent-custom-root",
      sessionFileParts: ["custom", "agents", "ops", "sessions", "cross-agent-custom-root.jsonl"],
      wrongStorePathParts: ["custom", "agents", "main", "sessions", "sessions.json"],
      message: { role: "assistant", content: "from-custom-ops" },
    },
  ] as const)(
    "reads cross-agent absolute sessionFile across store-root layouts for $sessionId",
    ({ sessionId, sessionFileParts, wrongStorePathParts, message }) => {
      const sessionFile = path.join(tmpDir, ...sessionFileParts);
      const wrongStorePath = path.join(tmpDir, ...wrongStorePathParts);
      fs.mkdirSync(path.dirname(sessionFile), { recursive: true });
      fs.writeFileSync(
        sessionFile,
        [
          JSON.stringify({ type: "session", version: 1, id: sessionId }),
          JSON.stringify({ message }),
        ].join("\n"),
        "utf-8",
      );

      const out = readSessionMessages(sessionId, wrongStorePath, sessionFile);
      expect(out).toHaveLength(1);
      expect(out[0]).toMatchObject(message);
      expect((out[0] as { __openclaw?: { seq?: number } }).__openclaw?.seq).toBe(1);
    },
  );
});

describe("readSessionPreviewItemsFromTranscript", () => {
  let tmpDir: string;
  let storePath: string;

  registerTempSessionStore("openclaw-session-preview-test-", (nextTmpDir, nextStorePath) => {
    tmpDir = nextTmpDir;
    storePath = nextStorePath;
  });

  function writeTranscriptLines(sessionId: string, lines: string[]) {
    const transcriptPath = path.join(tmpDir, `${sessionId}.jsonl`);
    fs.writeFileSync(transcriptPath, lines.join("\n"), "utf-8");
  }

  function readPreview(sessionId: string, maxItems = 3, maxChars = 120) {
    return readSessionPreviewItemsFromTranscript(
      sessionId,
      storePath,
      undefined,
      undefined,
      maxItems,
      maxChars,
    );
  }

  test("returns recent preview items with tool summary", () => {
    const sessionId = "preview-session";
    const lines = createToolSummaryPreviewTranscriptLines(sessionId);
    writeTranscriptLines(sessionId, lines);
    const result = readPreview(sessionId);

    expect(result.map((item) => item.role)).toEqual(["assistant", "tool", "assistant"]);
    expect(result[1]?.text).toContain("call weather");
  });

  test("detects tool calls from tool_use/tool_call blocks and toolName field", () => {
    const sessionId = "preview-session-tools";
    const lines = [
      JSON.stringify({ type: "session", version: 1, id: sessionId }),
      JSON.stringify({ message: { role: "assistant", content: "Hi" } }),
      JSON.stringify({
        message: {
          role: "assistant",
          toolName: "camera",
          content: [
            { type: "tool_use", name: "read" },
            { type: "tool_call", name: "write" },
          ],
        },
      }),
      JSON.stringify({ message: { role: "assistant", content: "Done" } }),
    ];
    writeTranscriptLines(sessionId, lines);
    const result = readPreview(sessionId);

    expect(result.map((item) => item.role)).toEqual(["assistant", "tool", "assistant"]);
    expect(result[1]?.text).toContain("call");
    expect(result[1]?.text).toContain("camera");
    expect(result[1]?.text).toContain("read");
    // Preview text may not list every tool name; it should at least hint there were multiple calls.
    expect(result[1]?.text).toMatch(/\+\d+/);
  });

  test("truncates preview text to max chars", () => {
    const sessionId = "preview-truncate";
    const longText = "a".repeat(60);
    const lines = [JSON.stringify({ message: { role: "assistant", content: longText } })];
    writeTranscriptLines(sessionId, lines);
    const result = readPreview(sessionId, 1, 24);

    expect(result).toHaveLength(1);
    expect(result[0]?.text.length).toBe(24);
    expect(result[0]?.text.endsWith("...")).toBe(true);
  });

  test("strips inline directives from preview items", () => {
    const sessionId = "preview-strip-inline-directives";
    const lines = [
      JSON.stringify({
        message: {
          role: "assistant",
          content: "A [[reply_to:abc-123]] B [[audio_as_voice]]",
        },
      }),
    ];
    writeTranscriptLines(sessionId, lines);
    const result = readPreview(sessionId, 1, 120);

    expect(result).toHaveLength(1);
    expect(result[0]?.text).toBe("A  B");
  });
});

describe("readLatestSessionUsageFromTranscript", () => {
  let tmpDir: string;
  let storePath: string;

  registerTempSessionStore("openclaw-session-usage-test-", (nextTmpDir, nextStorePath) => {
    tmpDir = nextTmpDir;
    storePath = nextStorePath;
  });

  test("returns the latest assistant usage snapshot and skips delivery mirrors", () => {
    const sessionId = "usage-session";
    writeTranscript(tmpDir, sessionId, [
      { type: "session", version: 1, id: sessionId },
      {
        message: {
          role: "assistant",
          provider: "openai",
          model: "gpt-5.4",
          usage: {
            input: 1200,
            output: 300,
            cacheRead: 50,
            cost: { total: 0.0042 },
          },
        },
      },
      {
        message: {
          role: "assistant",
          provider: "openclaw",
          model: "delivery-mirror",
          usage: { input: 0, output: 0, cacheRead: 0, cacheWrite: 0 },
        },
      },
    ]);

    expect(readLatestSessionUsageFromTranscript(sessionId, storePath)).toEqual({
      modelProvider: "openai",
      model: "gpt-5.4",
      inputTokens: 1200,
      outputTokens: 300,
      cacheRead: 50,
      totalTokens: 1250,
      totalTokensFresh: true,
      costUsd: 0.0042,
    });
  });

  test("aggregates assistant usage across the full transcript and keeps the latest context snapshot", () => {
    const sessionId = "usage-aggregate";
    writeTranscript(tmpDir, sessionId, [
      { type: "session", version: 1, id: sessionId },
      {
        message: {
          role: "assistant",
          provider: "anthropic",
          model: "claude-sonnet-4-6",
          usage: {
            input: 1_800,
            output: 400,
            cacheRead: 600,
            cost: { total: 0.0055 },
          },
        },
      },
      {
        message: {
          role: "assistant",
          usage: {
            input: 2_400,
            output: 250,
            cacheRead: 900,
            cost: { total: 0.006 },
          },
        },
      },
    ]);

    const snapshot = readLatestSessionUsageFromTranscript(sessionId, storePath);
    expect(snapshot).toMatchObject({
      modelProvider: "anthropic",
      model: "claude-sonnet-4-6",
      inputTokens: 4200,
      outputTokens: 650,
      cacheRead: 1500,
      totalTokens: 3300,
      totalTokensFresh: true,
    });
    expect(snapshot?.costUsd).toBeCloseTo(0.0115, 8);
  });

  test("reads earlier assistant usage outside the old tail window", () => {
    const sessionId = "usage-full-transcript";
    const filler = "x".repeat(20_000);
    writeTranscript(tmpDir, sessionId, [
      { type: "session", version: 1, id: sessionId },
      {
        message: {
          role: "assistant",
          provider: "openai",
          model: "gpt-5.4",
          usage: {
            input: 1_000,
            output: 200,
            cacheRead: 100,
            cost: { total: 0.0042 },
          },
        },
      },
      ...Array.from({ length: 80 }, () => ({ message: { role: "user", content: filler } })),
      {
        message: {
          role: "assistant",
          provider: "openai",
          model: "gpt-5.4",
          usage: {
            input: 500,
            output: 150,
            cacheRead: 50,
            cost: { total: 0.0021 },
          },
        },
      },
    ]);

    const snapshot = readLatestSessionUsageFromTranscript(sessionId, storePath);
    expect(snapshot).toMatchObject({
      modelProvider: "openai",
      model: "gpt-5.4",
      inputTokens: 1500,
      outputTokens: 350,
      cacheRead: 150,
      totalTokens: 550,
      totalTokensFresh: true,
    });
    expect(snapshot?.costUsd).toBeCloseTo(0.0063, 8);
  });

  test("returns null when the transcript has no assistant usage snapshot", () => {
    const sessionId = "usage-empty";
    writeTranscript(tmpDir, sessionId, [
      { type: "session", version: 1, id: sessionId },
      { message: { role: "user", content: "hello" } },
      { message: { role: "assistant", content: "hi" } },
    ]);

    expect(readLatestSessionUsageFromTranscript(sessionId, storePath)).toBeNull();
  });
});

describe("resolveSessionTranscriptCandidates", () => {
  afterEach(() => {
    vi.unstubAllEnvs();
  });

  test("fallback candidate uses OPENCLAW_HOME instead of os.homedir()", () => {
    vi.stubEnv("OPENCLAW_HOME", "/srv/openclaw-home");
    vi.stubEnv("HOME", "/home/other");

    const candidates = resolveSessionTranscriptCandidates("sess-1", undefined);
    const fallback = candidates[candidates.length - 1];
    expect(fallback).toBe(
      path.join(path.resolve("/srv/openclaw-home"), ".openclaw", "sessions", "sess-1.jsonl"),
    );
  });
});

describe("resolveSessionTranscriptCandidates safety", () => {
  test.each([
    {
      storePath: "/tmp/openclaw/agents/main/sessions/sessions.json",
      sessionFile: "/tmp/openclaw/agents/ops/sessions/sess-safe.jsonl",
    },
    {
      storePath: "/srv/custom/agents/main/sessions/sessions.json",
      sessionFile: "/srv/custom/agents/ops/sessions/sess-safe.jsonl",
    },
  ] as const)(
    "keeps cross-agent absolute sessionFile candidate for $storePath",
    ({ storePath, sessionFile }) => {
      const candidates = resolveSessionTranscriptCandidates("sess-safe", storePath, sessionFile);
      expect(candidates.map((value) => path.resolve(value))).toContain(path.resolve(sessionFile));
    },
  );

  test("drops unsafe session IDs instead of producing traversal paths", () => {
    const candidates = resolveSessionTranscriptCandidates(
      "../etc/passwd",
      "/tmp/openclaw/agents/main/sessions/sessions.json",
    );

    expect(candidates).toEqual([]);
  });

  test("drops unsafe sessionFile candidates and keeps safe fallbacks", () => {
    const storePath = "/tmp/openclaw/agents/main/sessions/sessions.json";
    const candidates = resolveSessionTranscriptCandidates(
      "sess-safe",
      storePath,
      "../../etc/passwd",
    );
    const normalizedCandidates = candidates.map((value) => path.resolve(value));
    const expectedFallback = path.resolve(path.dirname(storePath), "sess-safe.jsonl");

    expect(candidates.some((value) => value.includes("etc/passwd"))).toBe(false);
    expect(normalizedCandidates).toContain(expectedFallback);
  });

  test("prefers the current sessionId transcript before a stale sessionFile candidate", () => {
    const storePath = "/tmp/openclaw/agents/main/sessions/sessions.json";
    const candidates = resolveSessionTranscriptCandidates(
      "11111111-1111-4111-8111-111111111111",
      storePath,
      "/tmp/openclaw/agents/main/sessions/22222222-2222-4222-8222-222222222222.jsonl",
    );

    expect(candidates[0]).toBe(
      path.resolve("/tmp/openclaw/agents/main/sessions/11111111-1111-4111-8111-111111111111.jsonl"),
    );
    expect(candidates).toContain(
      path.resolve("/tmp/openclaw/agents/main/sessions/22222222-2222-4222-8222-222222222222.jsonl"),
    );
  });

  test("keeps explicit custom sessionFile ahead of synthesized fallback", () => {
    const storePath = "/tmp/openclaw/agents/main/sessions/sessions.json";
    const sessionFile = "/tmp/openclaw/agents/main/sessions/custom-transcript.jsonl";
    const candidates = resolveSessionTranscriptCandidates(
      "11111111-1111-4111-8111-111111111111",
      storePath,
      sessionFile,
    );

    expect(candidates[0]).toBe(path.resolve(sessionFile));
  });

  test("keeps custom topic-like transcript paths ahead of synthesized fallback", () => {
    const storePath = "/tmp/openclaw/agents/main/sessions/sessions.json";
    const sessionFile = "/tmp/openclaw/agents/main/sessions/custom-topic-notes.jsonl";
    const candidates = resolveSessionTranscriptCandidates(
      "11111111-1111-4111-8111-111111111111",
      storePath,
      sessionFile,
    );

    expect(candidates[0]).toBe(path.resolve(sessionFile));
  });

  test("keeps forked transcript paths ahead of synthesized fallback", () => {
    const storePath = "/tmp/openclaw/agents/main/sessions/sessions.json";
    const sessionId = "11111111-1111-4111-8111-111111111111";
    const sessionFile =
      "/tmp/openclaw/agents/main/sessions/2026-03-23T16-30-00-000Z_11111111-1111-4111-8111-111111111111.jsonl";
    const candidates = resolveSessionTranscriptCandidates(sessionId, storePath, sessionFile);

    expect(candidates[0]).toBe(path.resolve(sessionFile));
  });

  test("keeps timestamped custom transcript paths ahead of synthesized fallback", () => {
    const storePath = "/tmp/openclaw/agents/main/sessions/sessions.json";
    const sessionId = "11111111-1111-4111-8111-111111111111";
    const sessionFile = "/tmp/openclaw/agents/main/sessions/2026-03-23T16-30-00-000Z_notes.jsonl";
    const candidates = resolveSessionTranscriptCandidates(sessionId, storePath, sessionFile);

    expect(candidates[0]).toBe(path.resolve(sessionFile));
  });

  test("still treats generated topic transcripts from another session as stale", () => {
    const storePath = "/tmp/openclaw/agents/main/sessions/sessions.json";
    const sessionId = "11111111-1111-4111-8111-111111111111";
    const staleSessionFile =
      "/tmp/openclaw/agents/main/sessions/22222222-2222-4222-8222-222222222222-topic-thread.jsonl";
    const candidates = resolveSessionTranscriptCandidates(sessionId, storePath, staleSessionFile);

    expect(candidates[0]).toBe(
      path.resolve("/tmp/openclaw/agents/main/sessions/11111111-1111-4111-8111-111111111111.jsonl"),
    );
    expect(candidates).toContain(path.resolve(staleSessionFile));
  });
});

describe("archiveSessionTranscripts", () => {
  let tmpDir: string;
  let storePath: string;

  registerTempSessionStore("openclaw-archive-test-", (nextTmpDir, nextStorePath) => {
    tmpDir = nextTmpDir;
    storePath = nextStorePath;
  });

  beforeAll(() => {
    vi.stubEnv("OPENCLAW_HOME", tmpDir);
  });

  afterAll(() => {
    vi.unstubAllEnvs();
  });

  test.each([
    {
      sessionId: "sess-archive-1",
      transcriptFileName: "sess-archive-1.jsonl",
      buildArgs: () => ({ sessionId: "sess-archive-1", storePath, reason: "reset" as const }),
    },
    {
      sessionId: "sess-archive-2",
      transcriptFileName: "custom-transcript.jsonl",
      buildArgs: () => ({
        sessionId: "sess-archive-2",
        storePath: undefined,
        sessionFile: path.join(tmpDir, "custom-transcript.jsonl"),
        reason: "reset" as const,
      }),
    },
  ] as const)(
    "archives transcript from default and explicit sessionFile path for $sessionId",
    ({ transcriptFileName, buildArgs }) => {
      const transcriptPath = path.join(tmpDir, transcriptFileName);
      const args = buildArgs();
      fs.writeFileSync(transcriptPath, '{"type":"session"}\n', "utf-8");
      const archived = archiveSessionTranscripts(args);
      expect(archived).toHaveLength(1);
      expect(archived[0]).toContain(".reset.");
      expect(fs.existsSync(transcriptPath)).toBe(false);
      expect(fs.existsSync(archived[0])).toBe(true);
    },
  );

  test("returns empty array when no transcript files exist", () => {
    const archived = archiveSessionTranscripts({
      sessionId: "nonexistent-session",
      storePath,
      reason: "reset",
    });

    expect(archived).toEqual([]);
  });

  test("skips files that do not exist and archives only existing ones", () => {
    const sessionId = "sess-archive-3";
    const transcriptPath = path.join(tmpDir, `${sessionId}.jsonl`);
    fs.writeFileSync(transcriptPath, '{"type":"session"}\n', "utf-8");

    const archived = archiveSessionTranscripts({
      sessionId,
      storePath,
      sessionFile: "/nonexistent/path/file.jsonl",
      reason: "deleted",
    });

    expect(archived).toHaveLength(1);
    expect(archived[0]).toContain(".deleted.");
    expect(fs.existsSync(transcriptPath)).toBe(false);
  });
});