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import {
type BranchSummaryEntry,
buildContextEntries,
buildSessionContext,
type CompactionEntry,
type CustomEntry,
type ModelChangeEntry,
type SessionEntry,
type SessionMessageEntry,
type ThinkingLevelChangeEntry,
} from "../../src/core/session-manager.ts";
function msg(id: string, parentId: string | null, role: "user" | "assistant", text: string): SessionMessageEntry {
const base = { type: "message" as const, id, parentId, timestamp: "2025-01-01T00:00:00Z" };
if (role === "user") {
return { ...base, message: { role, content: text, timestamp: 1 } };
}
return {
...base,
message: {
role,
content: [{ type: "text", text }],
api: "anthropic-messages",
provider: "anthropic",
model: "claude-test",
usage: {
input: 1,
output: 1,
cacheRead: 0,
cacheWrite: 0,
totalTokens: 2,
cost: { input: 0, output: 0, cacheRead: 0, cacheWrite: 0, total: 0 },
},
stopReason: "stop",
timestamp: 1,
},
};
}
function compaction(id: string, parentId: string | null, summary: string, firstKeptEntryId: string): CompactionEntry {
return {
type: "compaction",
id,
parentId,
timestamp: "2025-01-01T00:00:00Z",
summary,
firstKeptEntryId,
tokensBefore: 1000,
};
}
function branchSummary(id: string, parentId: string | null, summary: string, fromId: string): BranchSummaryEntry {
return { type: "branch_summary", id, parentId, timestamp: "2025-01-01T00:00:00Z", summary, fromId };
}
function custom(id: string, parentId: string | null, customType: string, data?: unknown): CustomEntry {
return { type: "custom", id, parentId, timestamp: "2025-01-01T00:00:00Z", customType, data };
}
function thinkingLevel(id: string, parentId: string | null, level: string): ThinkingLevelChangeEntry {
return { type: "thinking_level_change", id, parentId, timestamp: "2025-01-01T00:00:00Z", thinkingLevel: level };
}
function modelChange(id: string, parentId: string | null, provider: string, modelId: string): ModelChangeEntry {
return { type: "model_change", id, parentId, timestamp: "2025-01-01T00:00:00Z", provider, modelId };
}
describe("buildSessionContext", () => {
describe("trivial cases", () => {
it("empty entries returns empty context", () => {
const ctx = buildSessionContext([]);
expect(ctx.messages).toEqual([]);
expect(ctx.thinkingLevel).toBe("off");
expect(ctx.model).toBeNull();
});
it("single user message", () => {
const entries: SessionEntry[] = [msg("1", null, "user", "hello")];
const ctx = buildSessionContext(entries);
expect(ctx.messages).toHaveLength(1);
expect(ctx.messages[0].role).toBe("user");
});
it("simple conversation", () => {
const entries: SessionEntry[] = [
msg("1", null, "user", "hello"),
msg("2", "1", "assistant", "hi there"),
msg("3", "2", "user", "how are you"),
msg("4", "3", "assistant", "great"),
];
const ctx = buildSessionContext(entries);
expect(ctx.messages).toHaveLength(4);
expect(ctx.messages.map((m) => m.role)).toEqual(["user", "assistant", "user", "assistant"]);
});
it("tracks thinking level changes", () => {
const entries: SessionEntry[] = [
msg("1", null, "user", "hello"),
thinkingLevel("2", "1", "high"),
msg("3", "2", "assistant", "thinking hard"),
];
const ctx = buildSessionContext(entries);
expect(ctx.thinkingLevel).toBe("high");
expect(ctx.messages).toHaveLength(2);
});
it("tracks model from assistant message", () => {
const entries: SessionEntry[] = [msg("1", null, "user", "hello"), msg("2", "1", "assistant", "hi")];
const ctx = buildSessionContext(entries);
expect(ctx.model).toEqual({ provider: "anthropic", modelId: "claude-test" });
});
it("tracks model from model change entry", () => {
const entries: SessionEntry[] = [
msg("1", null, "user", "hello"),
modelChange("2", "1", "openai", "gpt-4"),
msg("3", "2", "assistant", "hi"),
];
const ctx = buildSessionContext(entries);
// Assistant message overwrites model change
expect(ctx.model).toEqual({ provider: "anthropic", modelId: "claude-test" });
});
});
describe("with compaction", () => {
it("includes summary before kept messages", () => {
const entries: SessionEntry[] = [
msg("1", null, "user", "first"),
msg("2", "1", "assistant", "response1"),
msg("3", "2", "user", "second"),
msg("4", "3", "assistant", "response2"),
compaction("5", "4", "Summary of first two turns", "3"),
msg("6", "5", "user", "third"),
msg("7", "6", "assistant", "response3"),
];
const ctx = buildSessionContext(entries);
// Should have: summary + kept (3,4) + after (6,7) = 5 messages
expect(ctx.messages).toHaveLength(5);
expect((ctx.messages[0] as any).summary).toContain("Summary of first two turns");
expect((ctx.messages[1] as any).content).toBe("second");
expect((ctx.messages[2] as any).content[0].text).toBe("response2");
expect((ctx.messages[3] as any).content).toBe("third");
expect((ctx.messages[4] as any).content[0].text).toBe("response3");
});
it("handles compaction keeping from first message", () => {
const entries: SessionEntry[] = [
msg("1", null, "user", "first"),
msg("2", "1", "assistant", "response"),
compaction("3", "2", "Empty summary", "1"),
msg("4", "3", "user", "second"),
];
const ctx = buildSessionContext(entries);
// Summary + all messages (1,2,4)
expect(ctx.messages).toHaveLength(4);
expect((ctx.messages[0] as any).summary).toContain("Empty summary");
});
it("multiple compactions uses latest", () => {
const entries: SessionEntry[] = [
msg("1", null, "user", "a"),
msg("2", "1", "assistant", "b"),
compaction("3", "2", "First summary", "1"),
msg("4", "3", "user", "c"),
msg("5", "4", "assistant", "d"),
compaction("6", "5", "Second summary", "4"),
msg("7", "6", "user", "e"),
];
const ctx = buildSessionContext(entries);
// Should use second summary, keep from 4
expect(ctx.messages).toHaveLength(4);
expect((ctx.messages[0] as any).summary).toContain("Second summary");
});
it("buildContextEntries returns compaction-aware entries including custom entries", () => {
const entries: SessionEntry[] = [
msg("1", null, "user", "first"),
custom("2", "1", "old-state", { hidden: true }),
msg("3", "2", "assistant", "response1"),
custom("4", "3", "kept-card", { title: "Kept" }),
msg("5", "4", "user", "second"),
compaction("6", "5", "Summary", "4"),
custom("7", "6", "after-card", { title: "After" }),
msg("8", "7", "assistant", "response2"),
];
expect(buildContextEntries(entries).map((entry) => entry.id)).toEqual(["6", "4", "5", "7", "8"]);
const ctx = buildSessionContext(entries);
expect(ctx.messages.map((message) => message.role)).toEqual(["compactionSummary", "user", "assistant"]);
});
it("keeps settings from the full path after compaction", () => {
const entries: SessionEntry[] = [
msg("1", null, "user", "first"),
thinkingLevel("2", "1", "high"),
msg("3", "2", "assistant", "response1"),
msg("4", "3", "user", "second"),
compaction("5", "4", "Summary", "4"),
];
const ctx = buildSessionContext(entries);
expect(ctx.thinkingLevel).toBe("high");
expect(ctx.messages.map((message) => message.role)).toEqual(["compactionSummary", "user"]);
});
});
describe("with branches", () => {
it("follows path to specified leaf", () => {
// Tree:
// 1 -> 2 -> 3 (branch A)
// \-> 4 (branch B)
const entries: SessionEntry[] = [
msg("1", null, "user", "start"),
msg("2", "1", "assistant", "response"),
msg("3", "2", "user", "branch A"),
msg("4", "2", "user", "branch B"),
];
const ctxA = buildSessionContext(entries, "3");
expect(ctxA.messages).toHaveLength(3);
expect((ctxA.messages[2] as any).content).toBe("branch A");
const ctxB = buildSessionContext(entries, "4");
expect(ctxB.messages).toHaveLength(3);
expect((ctxB.messages[2] as any).content).toBe("branch B");
});
it("includes branch summary in path", () => {
const entries: SessionEntry[] = [
msg("1", null, "user", "start"),
msg("2", "1", "assistant", "response"),
msg("3", "2", "user", "abandoned path"),
branchSummary("4", "2", "Summary of abandoned work", "3"),
msg("5", "4", "user", "new direction"),
];
const ctx = buildSessionContext(entries, "5");
expect(ctx.messages).toHaveLength(4);
expect((ctx.messages[2] as any).summary).toContain("Summary of abandoned work");
expect((ctx.messages[3] as any).content).toBe("new direction");
});
it("complex tree with multiple branches and compaction", () => {
// Tree:
// 1 -> 2 -> 3 -> 4 -> compaction(5) -> 6 -> 7 (main path)
// \-> 8 -> 9 (abandoned branch)
// \-> branchSummary(10) -> 11 (resumed from 3)
const entries: SessionEntry[] = [
msg("1", null, "user", "start"),
msg("2", "1", "assistant", "r1"),
msg("3", "2", "user", "q2"),
msg("4", "3", "assistant", "r2"),
compaction("5", "4", "Compacted history", "3"),
msg("6", "5", "user", "q3"),
msg("7", "6", "assistant", "r3"),
// Abandoned branch from 3
msg("8", "3", "user", "wrong path"),
msg("9", "8", "assistant", "wrong response"),
// Branch summary resuming from 3
branchSummary("10", "3", "Tried wrong approach", "9"),
msg("11", "10", "user", "better approach"),
];
// Main path to 7: summary + kept(3,4) + after(6,7)
const ctxMain = buildSessionContext(entries, "7");
expect(ctxMain.messages).toHaveLength(5);
expect((ctxMain.messages[0] as any).summary).toContain("Compacted history");
expect((ctxMain.messages[1] as any).content).toBe("q2");
expect((ctxMain.messages[2] as any).content[0].text).toBe("r2");
expect((ctxMain.messages[3] as any).content).toBe("q3");
expect((ctxMain.messages[4] as any).content[0].text).toBe("r3");
// Branch path to 11: 1,2,3 + branch_summary + 11
const ctxBranch = buildSessionContext(entries, "11");
expect(ctxBranch.messages).toHaveLength(5);
expect((ctxBranch.messages[0] as any).content).toBe("start");
expect((ctxBranch.messages[1] as any).content[0].text).toBe("r1");
expect((ctxBranch.messages[2] as any).content).toBe("q2");
expect((ctxBranch.messages[3] as any).summary).toContain("Tried wrong approach");
expect((ctxBranch.messages[4] as any).content).toBe("better approach");
});
});
describe("edge cases", () => {
it("uses last entry when leafId not found", () => {
const entries: SessionEntry[] = [msg("1", null, "user", "hello"), msg("2", "1", "assistant", "hi")];
const ctx = buildSessionContext(entries, "nonexistent");
expect(ctx.messages).toHaveLength(2);
});
it("handles orphaned entries gracefully", () => {
const entries: SessionEntry[] = [
msg("1", null, "user", "hello"),
msg("2", "missing", "assistant", "orphan"), // parent doesn't exist
];
const ctx = buildSessionContext(entries, "2");
// Should only get the orphan since parent chain is broken
expect(ctx.messages).toHaveLength(1);
});
});
});
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