/**
 * postinstall.ts
 *
 * Runs automatically after `pi install npm:@aethrekh/pisces`.
 *
 * 1. Copies SYSTEM.md to ~/.pi/agent/APPEND_SYSTEM.md so the Pisces persona
 *    is injected into every Pi session without needing a restart.
 * 2. Copies pisces-editorial-noir.json to ~/.pi/agent/themes/ so Pi can find
 *    it by name at startup and correctly restore a saved theme preference.
 */

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

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

const THEME_NAME = "pisces-editorial-noir.json";
const THEME_SRC = path.join(__dirname, "themes", THEME_NAME);
const THEME_DEST = path.join(THEMES_DIR, THEME_NAME);

const SYSTEM_SRC = path.join(__dirname, "SYSTEM.md");
const SYSTEM_DEST = path.join(AGENT_DIR, "APPEND_SYSTEM.md");

function installSystem(): void {
  if (!fs.existsSync(SYSTEM_SRC)) {
    console.log("Pisces: SYSTEM.md not found — skipping persona install.");
    return;
  }
  try {
    fs.mkdirSync(AGENT_DIR, { recursive: true });
    fs.copyFileSync(SYSTEM_SRC, SYSTEM_DEST);
    console.log(`Pisces: installed persona → ${SYSTEM_DEST}`);
  } catch (err) {
    console.error("Pisces: could not install persona:", err);
  }
}

function installTheme(): void {
  if (!fs.existsSync(THEME_SRC)) {
    console.log("Pisces: theme source not found — skipping theme install.");
    return;
  }
  try {
    fs.mkdirSync(THEMES_DIR, { recursive: true });
    fs.copyFileSync(THEME_SRC, THEME_DEST);
    console.log(`Pisces: installed theme → ${THEME_DEST}`);
  } catch (err) {
    // Non-fatal: theme will still be available via resources_discover, just
    // won't persist across restarts if the user saves it as their preference.
    console.error("Pisces: could not install theme:", err);
  }
}

installSystem();
installTheme();