/**
 * cleanup.ts
 *
 * Removes Pisces-owned files from ~/.pi/agent/ on uninstall.
 * Safe to run multiple times — will not touch files it didn't create.
 *
 * Run manually:   pnpm cleanup
 * Auto-runs via:  preuninstall lifecycle hook
 */

import * as fs from "fs";
import * as path from "path";
import * as os from "os";

const AGENT_DIR = path.join(os.homedir(), ".pi", "agent");

// ── Legacy APPEND_SYSTEM.md (written by pre-v0.2 installs) ───────────────────
const APPEND_PATH = path.join(AGENT_DIR, "APPEND_SYSTEM.md");
const SYSTEM_MD_PATH = path.join(__dirname, "..", "SYSTEM.md");

// ── Theme file (written by postinstall) ───────────────────────────────────────
const THEME_PATH = path.join(AGENT_DIR, "themes", "pisces-editorial-noir.json");
const PISCES_THEME_NAME = "pisces-editorial-noir";

function removeAppendSystemMd(): void {
  if (!fs.existsSync(APPEND_PATH)) return;

  let systemContent = "";
  try {
    systemContent = fs.readFileSync(SYSTEM_MD_PATH, "utf-8").trim();
  } catch {
    console.log("Could not read SYSTEM.md — skipping APPEND_SYSTEM.md cleanup to be safe.");
    return;
  }

  const existing = fs.readFileSync(APPEND_PATH, "utf-8").trim();
  if (existing !== systemContent) {
    console.log(
      "~/.pi/agent/APPEND_SYSTEM.md exists but was not written by Pisces — leaving it untouched."
    );
    return;
  }

  try {
    fs.unlinkSync(APPEND_PATH);
    console.log("Pisces: removed ~/.pi/agent/APPEND_SYSTEM.md");
  } catch (err) {
    console.error("Failed to remove APPEND_SYSTEM.md:", err);
  }
}

function removeTheme(): void {
  if (!fs.existsSync(THEME_PATH)) return;

  try {
    const json = JSON.parse(fs.readFileSync(THEME_PATH, "utf-8")) as { name?: string };
    if (json.name !== PISCES_THEME_NAME) {
      console.log(`~/.pi/agent/themes/pisces-editorial-noir.json has unexpected name "${json.name}" — leaving it untouched.`);
      return;
    }
    fs.unlinkSync(THEME_PATH);
    console.log("Pisces: removed ~/.pi/agent/themes/pisces-editorial-noir.json");
  } catch (err) {
    console.error("Failed to remove theme file:", err);
  }
}

function main(): void {
  removeAppendSystemMd();
  removeTheme();
}

main();