// launchd-plist.mjs — Spor C / C1 Tier 2: pure renderer for the detection
// LaunchAgent. SKRIVER ALDRI / never writes — it only builds strings and
// resolves paths. The thin imperative side (write the file, run launchctl)
// lives in scheduler.mjs, mirroring the detection-schedule.mjs (pure core) +
// run-detection.mjs (thin executor) split.
//
// Why these specific plist choices (search-first verified, 2026-06):
//   - StartCalendarInterval (NOT StartInterval): a calendar trigger runs the
//     job on wake if the fire time was missed during sleep; StartInterval just
//     skips it. Decisive for a laptop that sleeps.
//   - EnvironmentVariables.PATH: launchd starts jobs with a MINIMAL PATH, so a
//     bare `node` lookup (run-detection.mjs uses execFileSync('node', ...)) would
//     fail. We inject dirname(nodePath) PLUS the upgrade-stable /usr/local/bin
//     symlink dir, so a `brew upgrade node` (which moves the version-pinned
//     Cellar path) can't orphan the agent.
//   - Absolute paths only: launchd does not expand `~`.
//
// Pure: imports only node:path/node:url. No fs, no child_process.

import { dirname } from 'node:path';

const LABEL = 'com.ktg.ms-ai-architect.detection';

/** The system PATH floor launchd should always have, plus Homebrew's stable symlink dir. */
const STABLE_PATH = ['/usr/local/bin', '/usr/bin', '/bin', '/usr/sbin', '/sbin'];

/** Escape a value for inclusion in a plist <string> (a plist is XML). */
export function xmlEscape(value) {
  return String(value)
    .replace(/&/g, '&amp;')
    .replace(/</g, '&lt;')
    .replace(/>/g, '&gt;');
}

/** The stable reverse-DNS label for the detection LaunchAgent. */
export function defaultLabel() {
  return LABEL;
}

/**
 * Render a LaunchAgent plist that runs `<nodePath> <scriptPath> <...args>`
 * daily at hour:minute. Every interpolated value is XML-escaped; the schedule
 * is StartCalendarInterval (sleep-safe); RunAtLoad is false (first run at the
 * next scheduled fire, not at install).
 * @param {{label:string,nodePath:string,scriptPath:string,args:string[],hour:number,minute:number,logPath:string,workingDir:string}} o
 * @returns {string}
 */
export function renderPlist({ label, nodePath, scriptPath, args = [], hour, minute, logPath, workingDir }) {
  // PATH: dirname(node) first (so child `node` spawns resolve), then the stable floor.
  const pathValue = [dirname(nodePath), ...STABLE_PATH].join(':');
  const programArgs = [nodePath, scriptPath, ...args]
    .map((a) => `        <string>${xmlEscape(a)}</string>`)
    .join('\n');

  return `<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
    <key>Label</key>
    <string>${xmlEscape(label)}</string>
    <key>ProgramArguments</key>
    <array>
${programArgs}
    </array>
    <key>StartCalendarInterval</key>
    <dict>
        <key>Hour</key>
        <integer>${Number(hour)}</integer>
        <key>Minute</key>
        <integer>${Number(minute)}</integer>
    </dict>
    <key>RunAtLoad</key>
    <false/>
    <key>EnvironmentVariables</key>
    <dict>
        <key>PATH</key>
        <string>${xmlEscape(pathValue)}</string>
    </dict>
    <key>WorkingDirectory</key>
    <string>${xmlEscape(workingDir)}</string>
    <key>StandardOutPath</key>
    <string>${xmlEscape(logPath)}</string>
    <key>StandardErrorPath</key>
    <string>${xmlEscape(logPath)}</string>
</dict>
</plist>
`;
}

/**
 * Resolve the absolute paths the installer needs. All absolute (no `~`).
 * The LaunchAgent lives in ~/Library/LaunchAgents; the log lives in the
 * gitignored scripts/kb-update/data/ dir; launchd runs scheduler.mjs (which
 * gates on cadence, then delegates to the Claude-free run-detection.mjs).
 * @param {{pluginRoot:string,homeDir:string,nodePath:string}} o
 */
export function resolvePaths({ pluginRoot, homeDir }) {
  const label = LABEL;
  return {
    label,
    agentPlistPath: `${homeDir}/Library/LaunchAgents/${label}.plist`,
    scriptPath: `${pluginRoot}/scripts/kb-update/scheduler.mjs`,
    logPath: `${pluginRoot}/scripts/kb-update/data/detection-scheduler.log`,
    workingDir: pluginRoot,
  };
}