import { afterEach, beforeEach, describe, expect, it } from "bun:test";
import { lstat, mkdir, mkdtemp, readFile, readdir, rm, symlink, writeFile } from "node:fs/promises";
import { join } from "node:path";
import { tmpdir } from "node:os";
import { SessionWorkspaceStore } from "../../src/sessions/workspace-store.js";
import { SessionUiStateStore } from "../../src/sessions/uiStateStore.js";
import { SessionTranscriptStore } from "../../src/sessions/transcriptStore.js";
import { SessionMetadataStore } from "../../src/sessions/metadataStore.js";
import { SessionLearningStateStore } from "../../src/learning/sessionStateStore.js";
import { bindScopedConversationWorkspace, createConversationWorkspace, sessionWorkspaceDirectory } from "../../src/runtime/conversationWorkspace.js";

describe("owned session workspaces", () => {
  let base: string;
  let records: SessionWorkspaceStore;
  const owner = { actorKey: "actor-a", projectKey: "project-a", sessionId: "chat-1" };
  beforeEach(async () => {
    base = await mkdtemp(join(tmpdir(), "tjwater-owned-chat-"));
    records = new SessionWorkspaceStore(join(base, "data", "session-workspaces"));
  });
  afterEach(async () => { await rm(base, { recursive: true, force: true }); });

  it("keeps messages and searchable transcripts private to their user and scope", async () => {
    const ui = new SessionUiStateStore(join(base, "old-ui"), records);
    const transcript = new SessionTranscriptStore(join(base, "old-transcripts"), records);
    await ui.write(owner, { sessionId: owner.sessionId, messages: [{ text: "private answer" }] });
    await transcript.appendTurn(owner, { userMessage: "private question", assistantMessage: "private answer", toolCallCount: 0 });
    expect((await new SessionUiStateStore(join(base, "old-ui"), records).read(owner))?.messages).toHaveLength(1);
    expect(await ui.read({ ...owner, actorKey: "actor-b" })).toBeNull();
    expect(await ui.read({ ...owner, projectKey: "project-b" })).toBeNull();
    expect(await transcript.search(owner, "private")).toHaveLength(2);
    expect(await transcript.search({ ...owner, actorKey: "actor-b" }, "private")).toEqual([]);
    expect(await transcript.search({ ...owner, projectKey: "project-b" }, "private")).toEqual([]);
    expect((await lstat(records.path(owner, "messages.json"))).mode & 0o777).toBe(0o600);
    expect((await lstat(join(sessionWorkspaceDirectory(records.root, owner), "chat"))).mode & 0o777).toBe(0o700);
    await expect(transcript.cloneThread(owner, { ...owner, actorKey: "actor-b" }, 2)).rejects.toThrow("across users or scopes");
  });

  it("has a separate personal namespace for each user and separates it from projects", async () => {
    const ui = new SessionUiStateStore(join(base, "old-ui"), records);
    const personal = { ...owner, projectKey: "personal-actor-a" };
    await ui.write(personal, { sessionId: owner.sessionId, messages: [{ text: "personal answer" }] });
    expect(records.path(personal, "messages.json")).toContain("/actor-a/personal/");
    expect(await ui.read(owner)).toBeNull();
    expect(await ui.read({ ...personal, actorKey: "actor-b", projectKey: "personal-actor-b" })).toBeNull();
    expect(() => records.path({ ...personal, projectKey: "personal-actor-b" }, "messages.json")).toThrow("owner mismatch");
  });

  it("preserves legacy bytes and keeps backups without overwriting later chat updates", async () => {
    const metadataDir = join(base, "metadata");
    const uiStateDir = join(base, "ui");
    const transcriptDir = join(base, "transcripts");
    for (const path of [metadataDir, uiStateDir, transcriptDir]) await mkdir(path);
    await writeFile(join(metadataDir, "chat.json"), JSON.stringify(owner));
    const messages = JSON.stringify({ sessionId: owner.sessionId, messages: [{ text: "legacy" }] });
    const turns = JSON.stringify({ ...owner, turns: [{ userMessage: "legacy question", assistantMessage: "legacy answer" }] });
    await writeFile(join(uiStateDir, "chat.json"), messages);
    await writeFile(join(uiStateDir, "orphan.json"), JSON.stringify({ sessionId: "unknown", messages: [] }));
    await writeFile(join(transcriptDir, "chat.json"), turns);
    const options = { metadataDir, uiStateDir, transcriptDir };
    expect(await records.migrateLegacyRecords(options)).toEqual({ uiStates: 1, transcripts: 1, learningStates: 0, retainedUnownedUiStates: 1 });
    expect(await readFile(records.path(owner, "messages.json"), "utf8")).toBe(messages);
    expect(await readFile(records.path(owner, "transcript.json"), "utf8")).toBe(turns);
    await new SessionUiStateStore(uiStateDir, records).write(owner, { sessionId: owner.sessionId, messages: [{ text: "new answer" }] });
    expect((await records.migrateLegacyRecords(options)).uiStates).toBe(0);
    const archive = join(sessionWorkspaceDirectory(records.backupRoot, owner), "chat");
    const backup = (await readdir(archive)).find((name) => name.startsWith("messages-"))!;
    expect(await readFile(join(archive, backup), "utf8")).toBe(messages);
    expect(await readdir(uiStateDir)).toEqual(["orphan.json"]);
    expect((await new SessionUiStateStore(uiStateDir, records).read(owner))?.messages).toEqual([{ text: "new answer" }]);
  });

  it("rejects traversal, linked records and mismatched ownership", async () => {
    expect(() => records.path({ ...owner, actorKey: "../other-user" }, "messages.json")).toThrow("invalid workspace scope");
    await records.ensure(owner);
    const foreign = join(base, "foreign.json");
    await writeFile(foreign, "private");
    await symlink(foreign, records.path(owner, "messages.json"));
    await expect(new SessionUiStateStore(join(base, "old-ui"), records).read(owner)).rejects.toThrow("symbolic link");
    await writeFile(join(sessionWorkspaceDirectory(records.root, owner), "chat", "owner.json"), JSON.stringify({ ...owner, actorKey: "actor-b" }));
    await expect(records.ensure(owner)).rejects.toThrow("ownership mismatch");
  });

  it("moves computation files beside chat records and refuses another user's binding", async () => {
    await records.ensure(owner);
    const old = await createConversationWorkspace(records.root);
    await writeFile(join(old, "files", "result.txt"), "kept result");
    const workspace = await bindScopedConversationWorkspace(old, records.root, owner);
    expect(await readFile(join(workspace, "files", "result.txt"), "utf8")).toBe("kept result");
    expect(await bindScopedConversationWorkspace(old, records.root, owner)).toBe(workspace);
    await expect(bindScopedConversationWorkspace(workspace, records.root, { ...owner, actorKey: "actor-b" })).rejects.toThrow("another user");
    expect(await readFile(join(workspace, "files", "result.txt"), "utf8")).toBe("kept result");
  });

  it("checks full identity on history lists and rejects session filename aliases", async () => {
    const metadata = new SessionMetadataStore(join(base, "metadata"));
    await metadata.initialize();
    await metadata.ensure({ ...owner, userId: "user-a", projectId: "project-a" });
    expect(await metadata.list({ ...owner, userId: "user-b", projectId: "project-a" })).toEqual([]);
    expect(await metadata.get(owner, "CHAT-1")).toBeNull();
    await expect(metadata.ensure({ ...owner, sessionId: "CHAT-1" })).rejects.toThrow("session not found");
    const attempts = await Promise.allSettled([
      metadata.ensure({ ...owner, sessionId: "concurrent", userId: "user-a" }),
      metadata.ensure({ ...owner, sessionId: "concurrent", userId: "user-b" }),
    ]);
    expect(attempts.filter((result) => result.status === "fulfilled")).toHaveLength(1);
    expect(attempts.filter((result) => result.status === "rejected")).toHaveLength(1);
  });

  it("purges owned content and prevents late writes or a legacy import from reviving a deleted chat", async () => {
    const metadataDir = join(base, "metadata");
    const uiStateDir = join(base, "ui");
    const transcriptDir = join(base, "transcripts");
    const learningStateDir = join(base, "learning");
    for (const path of [metadataDir, uiStateDir, transcriptDir, learningStateDir]) await mkdir(path);
    const metadata = new SessionMetadataStore(metadataDir, records);
    const { record } = await metadata.ensure(owner);
    const ui = new SessionUiStateStore(uiStateDir, records);
    const transcript = new SessionTranscriptStore(transcriptDir, records);
    const learning = new SessionLearningStateStore(learningStateDir, records);
    const legacyUi = JSON.stringify({ sessionId: owner.sessionId, messages: [{ text: "private content" }] });
    await writeFile(join(uiStateDir, "chat.json"), legacyUi);
    await writeFile(join(learningStateDir, `${owner.sessionId}.json`), JSON.stringify({ sessionId: owner.sessionId, lastGatedTurn: 2, lastReviewedTurn: 0, updatedAt: "2026-10-10" }));
    const sources = { metadataDir, uiStateDir, transcriptDir, learningStateDir };
    expect((await records.migrateLegacyRecords(sources)).learningStates).toBe(1);
    expect((await learning.read(owner)).lastGatedTurn).toBe(2);
    await transcript.appendTurn(owner, { userMessage: "private question", assistantMessage: "private answer", toolCallCount: 0 });
    const workspace = await bindScopedConversationWorkspace(await createConversationWorkspace(records.root), records.root, owner);
    await writeFile(join(workspace, "files", "result.txt"), "private result");
    const foreign = { ...owner, actorKey: "actor-b", sessionId: "chat-2" };
    await ui.write(foreign, { sessionId: foreign.sessionId, messages: [{ text: "keep this" }] });
    await metadata.remove(record);
    expect(await metadata.get(owner, owner.sessionId)).toBeNull();
    expect(await metadata.list(owner)).toEqual([]);
    expect(await transcript.search(owner, "private")).toEqual([]);
    await expect(ui.write(owner, { sessionId: owner.sessionId, messages: [] })).rejects.toThrow("session not found");
    await expect(metadata.touch(record, { title: "late title" })).rejects.toThrow("session not found");
    await expect(learning.completeGate(owner, 4)).rejects.toThrow("session not found");
    await metadata.purge(record);
    expect((await readdir(join(sessionWorkspaceDirectory(records.root, owner), "chat"))).sort()).toEqual(["deleted.json", "owner.json"]);
    await expect(lstat(workspace)).rejects.toMatchObject({ code: "ENOENT" });
    await expect(lstat(sessionWorkspaceDirectory(records.backupRoot, owner))).rejects.toMatchObject({ code: "ENOENT" });
    expect((await ui.read(foreign))?.messages).toEqual([{ text: "keep this" }]);
    await writeFile(join(uiStateDir, "chat.json"), legacyUi);
    await writeFile(join(transcriptDir, "chat.json"), JSON.stringify({ ...owner, turns: [] }));
    expect((await records.migrateLegacyRecords(sources)).uiStates).toBe(0);
    expect(await ui.read(owner)).toBeNull();
    expect(await readdir(uiStateDir)).toEqual([]);
    await expect(metadata.ensure(owner)).rejects.toThrow("session not found");
    await metadata.purge(record);
  });

  it("honors the durable index deletion when writing the workspace marker fails", async () => {
    const metadataDir = join(base, "metadata");
    const metadata = new SessionMetadataStore(metadataDir, records);
    const { record } = await metadata.ensure(owner);
    const transcript = new SessionTranscriptStore(join(base, "legacy"), records);
    await transcript.appendTurn(owner, { userMessage: "private question", assistantMessage: "private answer", toolCallCount: 0 });
    const markDeleted = records.markDeleted.bind(records);
    records.markDeleted = async () => { throw new Error("disk write interrupted"); };
    await expect(metadata.remove(record)).rejects.toThrow("disk write interrupted");
    expect(await metadata.get(owner, owner.sessionId)).toBeNull();
    expect(await transcript.search(owner, "private")).toEqual([]);
    await expect(records.writeRecord(owner, "messages.json", { sessionId: owner.sessionId, messages: [] })).rejects.toThrow("session not found");
    records = new SessionWorkspaceStore(records.root, records.backupRoot);
    const restarted = new SessionMetadataStore(metadataDir, records);
    expect(await new SessionTranscriptStore(join(base, "legacy"), records).search(owner, "private")).toEqual([]);
    await expect(restarted.ensure(owner)).rejects.toThrow("session not found");
    await markDeleted(owner);
    await restarted.remove(record);
    await restarted.purge(record);
  });
});