import { describe, expect, it } from "vitest";
import {
  type FileEntry,
  migrateSessionEntries,
} from "../../src/core/session-manager.js";

describe("migrateSessionEntries", () => {
  it("should add id/parentId to v1 entries", () => {
    const entries: FileEntry[] = [
      {
        type: "session",
        id: "sess-1",
        timestamp: "2025-01-01T00:00:00Z",
        cwd: "/tmp",
      },
      {
        type: "message",
        timestamp: "2025-01-01T00:00:01Z",
        message: { role: "user", content: "hi", timestamp: 1 },
      },
      {
        type: "message",
        timestamp: "2025-01-01T00:00:02Z",
        message: {
          role: "assistant",
          content: [{ type: "text", text: "hello" }],
          api: "test",
          provider: "test",
          model: "test",
          usage: { input: 1, output: 1, cacheRead: 0, cacheWrite: 0 },
          stopReason: "stop",
          timestamp: 2,
        },
      },
    ] as FileEntry[];

    migrateSessionEntries(entries);

    // Header should have version set (v3 is current after hookMessage->custom migration)
    expect((entries[0] as any).version).toBe(3);

    // Entries should have id/parentId
    const msg1 = entries[1] as any;
    const msg2 = entries[2] as any;

    expect(msg1.id).toBeDefined();
    expect(msg1.id.length).toBe(8);
    expect(msg1.parentId).toBeNull();

    expect(msg2.id).toBeDefined();
    expect(msg2.id.length).toBe(8);
    expect(msg2.parentId).toBe(msg1.id);
  });

  it("should be idempotent (skip already migrated)", () => {
    const entries: FileEntry[] = [
      {
        type: "session",
        id: "sess-1",
        version: 2,
        timestamp: "2025-01-01T00:00:00Z",
        cwd: "/tmp",
      },
      {
        type: "message",
        id: "abc12345",
        parentId: null,
        timestamp: "2025-01-01T00:00:01Z",
        message: { role: "user", content: "hi", timestamp: 1 },
      },
      {
        type: "message",
        id: "def67890",
        parentId: "abc12345",
        timestamp: "2025-01-01T00:00:02Z",
        message: {
          role: "assistant",
          content: [{ type: "text", text: "hello" }],
          api: "test",
          provider: "test",
          model: "test",
          usage: { input: 1, output: 1, cacheRead: 0, cacheWrite: 0 },
          stopReason: "stop",
          timestamp: 2,
        },
      },
    ] as FileEntry[];

    migrateSessionEntries(entries);

    // IDs should be unchanged
    expect((entries[1] as any).id).toBe("abc12345");
    expect((entries[2] as any).id).toBe("def67890");
    expect((entries[2] as any).parentId).toBe("abc12345");
  });
});