/**
 * @file Tests for server/lib/agent-edits.js (issue #86): the files a
 * subagent wrote or edited are read from its own transcript — +/- lines from
 * `structuredPatch` or a created file's content, a failed call left out, a
 * nested subagent folded in — and put on the parent's Agent result as `edits`;
 * and `turnCarry` hands a page of the chat the edits its cut-off first turn
 * made before the page began.
 * @author Nguyễn Ngọc Trí Vĩ <vinnt@smartgift.vn>
 */

const { describe, it, before, after } = require("node:test");
const assert = require("node:assert/strict");
const fs = require("node:fs");
const os = require("node:os");
const path = require("node:path");

const HOME = fs.mkdtempSync(path.join(os.tmpdir(), "agent-edits-"));
process.env.CLAUDE_HOME = HOME;

const { encodeCwd } = require("../lib/claude-home");
const { agentEdits, attachAgentEdits, turnCarry, _cache } = require("../lib/agent-edits");

const CWD = "/work/repo";
const SID = "11111111-2222-3333-4444-555555555555";
const subDir = path.join(HOME, "projects", encodeCwd(CWD), SID, "subagents");

const call = (id, name, input) => ({
  type: "assistant",
  message: { content: [{ type: "tool_use", id, name, input }] },
});
const result = (id, toolUseResult, isError = false) => ({
  type: "user",
  message: { content: [{ type: "tool_result", tool_use_id: id, is_error: isError }] },
  toolUseResult,
});
const write = (agentId, lines) =>
  fs.writeFileSync(
    path.join(subDir, `agent-${agentId}.jsonl`),
    lines.map((l) => JSON.stringify(l)).join("\n")
  );

before(() => {
  fs.mkdirSync(subDir, { recursive: true });
  write("a1", [
    call("t1", "Edit", { file_path: "/work/repo/main.go" }),
    result("t1", { structuredPatch: [{ lines: [" x", "-old", "+new", "+more"] }] }),
    call("t2", "Write", { file_path: "/work/repo/new_test.go" }),
    result("t2", { type: "create", content: "a\nb\nc\n" }),
    call("t3", "Edit", { file_path: "/work/repo/broken.go" }),
    result("t3", "String to replace not found", true),
    call("t4", "Agent", { prompt: "go deeper" }),
    result("t4", { agentId: "a2", status: "completed" }),
  ]);
  write("a2", [
    call("u1", "Edit", { file_path: "/work/repo/main.go" }),
    result("u1", { structuredPatch: [{ lines: ["+x"] }] }),
    call("u2", "Bash", { command: "go test ./..." }),
    result("u2", { stdout: "ok" }),
  ]);
});
after(() => fs.rmSync(HOME, { recursive: true, force: true }));

describe("agentEdits", () => {
  it("lists a subagent's files with their lines, nested subagents folded in", async () => {
    const edits = await agentEdits(SID, CWD, "a1");
    assert.deepEqual(edits, [
      { path: "/work/repo/main.go", added: 3, removed: 1, counted: true },
      { path: "/work/repo/new_test.go", added: 3, removed: 0, counted: true },
    ]);
  });

  it("answers an empty list for a subagent with no transcript", async () => {
    assert.deepEqual(await agentEdits(SID, CWD, "nope"), []);
  });

  it("reads a transcript again only after it changed", async () => {
    await agentEdits(SID, CWD, "a2");
    const file = path.join(subDir, "agent-a2.jsonl");
    const before = _cache.get(file);
    await agentEdits(SID, CWD, "a2");
    assert.equal(_cache.get(file), before);
    fs.appendFileSync(
      file,
      "\n" +
        [
          call("u3", "Write", { file_path: "/work/repo/late.go" }),
          result("u3", { type: "create", content: "z\n" }),
        ]
          .map((l) => JSON.stringify(l))
          .join("\n")
    );
    const edits = await agentEdits(SID, CWD, "a2");
    assert.ok(edits.some((e) => e.path === "/work/repo/late.go"));
  });
});

describe("attachAgentEdits", () => {
  it("puts edits on an Agent result only", async () => {
    const messages = [
      {
        content: [
          { type: "tool_result", id: "t9", agent: { id: "a1" } },
          { type: "tool_result", id: "t8", diff: { added: 1, removed: 0 } },
          { type: "tool_result", id: "t7", agent: { id: "a1" }, is_error: true },
        ],
      },
    ];
    await attachAgentEdits(messages, SID, CWD);
    const [ok, plain, failed] = messages[0].content;
    assert.ok(ok.edits.some((e) => e.path === "/work/repo/new_test.go"));
    assert.equal(plain.edits, undefined);
    assert.equal(failed.edits, undefined);
  });
});

describe("turnCarry", () => {
  const prompt = (text) => ({ type: "user", sender: "user", content: [{ type: "text", text }] });
  const use = (id, name, file_path) => ({
    type: "assistant",
    sender: "assistant",
    content: [{ type: "tool_use", id, name, input: file_path ? { file_path } : {} }],
  });
  const res = (id, extra = {}) => ({
    type: "user",
    sender: "tool",
    content: [{ type: "tool_result", id, ...extra }],
  });

  it("answers the files the cut-off turn changed before the page", async () => {
    const c = turnCarry();
    for (const m of [
      prompt("old turn"),
      use("o1", "Write", "/w/old.go"),
      res("o1", { diff: { added: 9, removed: 0 } }),
      prompt("this turn"),
      use("1", "Write", "/w/a_test.go"),
      res("1", { diff: { added: 176, removed: 0 } }),
      use("2", "Edit", "/w/bad.go"),
      res("2", { is_error: true }),
      use("3", "Edit", "/w/b.go"),
    ])
      c.drop(m);
    // The page: the result of a dropped call, then more of the same turn.
    const page = [res("3", { diff: { added: 2, removed: 1 } }), use("4", "Write", "/w/c.go")];
    assert.deepEqual(await c.result(page, SID, CWD), [
      { path: "/w/a_test.go", added: 176, removed: 0, counted: true },
      { path: "/w/b.go", added: 2, removed: 1, counted: true },
    ]);
  });

  it("answers null when the page starts on a prompt", async () => {
    const c = turnCarry();
    c.drop(prompt("p"));
    c.drop(use("1", "Write", "/w/a.go"));
    c.drop(res("1", { diff: { added: 1, removed: 0 } }));
    assert.equal(await c.result([prompt("next")], SID, CWD), null);
  });

  it("folds in a dropped subagent's own edits", async () => {
    const c = turnCarry();
    c.drop(prompt("p"));
    c.drop(use("9", "Agent"));
    c.drop(res("9", { agent: { id: "a1" } }));
    const got = await c.result([use("10", "Bash")], SID, CWD);
    assert.ok(got.some((e) => e.path === "/work/repo/new_test.go"));
  });
});