/**
 * Keyword-based command parser.
 *
 * Maps spoken text to robot actions via regex matching.
 * Supports both French and English keywords, responds in the detected language.
 * Returns { response, action? } — designed to be a drop-in replacement
 * for an LLM-based parser in V2 (same parse() interface).
 */

const COMMANDS = [
  {
    pattern: /\b(wake\s*up|r[eé]veille[- ]?toi|debout)\b/i,
    response: { fr: "Je me r\u00e9veille !", en: "Waking up!" },
    action: { type: "wakeUp" },
  },
  {
    pattern: /\b((go\s*to\s*)?sleep|dors|endors[- ]?toi|au dodo)\b/i,
    response: { fr: "Je vais dormir.", en: "Going to sleep." },
    action: { type: "gotoSleep" },
  },
  {
    pattern: /\b(look\s+left|regarde\s+[àa]\s+gauche|tourne\s+[àa]\s+gauche|gauche)\b/i,
    response: { fr: "Je regarde \u00e0 gauche.", en: "Looking left." },
    action: { type: "lookDirection", params: { direction: "left" } },
  },
  {
    pattern: /\b(look\s+right|regarde\s+[àa]\s+droite|tourne\s+[àa]\s+droite|droite)\b/i,
    response: { fr: "Je regarde \u00e0 droite.", en: "Looking right." },
    action: { type: "lookDirection", params: { direction: "right" } },
  },
  {
    pattern: /\b(look\s+up|regarde\s+en\s+haut|l[eè]ve\s+la\s+t[eê]te|en haut)\b/i,
    response: { fr: "Je regarde en haut.", en: "Looking up." },
    action: { type: "lookDirection", params: { direction: "up" } },
  },
  {
    pattern: /\b(look\s+down|regarde\s+en\s+bas|baisse\s+la\s+t[eê]te|en bas)\b/i,
    response: { fr: "Je regarde en bas.", en: "Looking down." },
    action: { type: "lookDirection", params: { direction: "down" } },
  },
  {
    pattern: /\b(look\s+(at\s+me|center|straight|forward)|centre|regarde[- ]?moi|devant\s+toi|en face)\b/i,
    response: { fr: "Me voil\u00e0 !", en: "Here I am!" },
    action: { type: "lookDirection", params: { direction: "center" } },
  },
  {
    pattern: /\b(turn\s+around|tourne[- ]?toi|fais\s+un\s+tour|retourne[- ]?toi|demi[- ]?tour)\b/i,
    response: { fr: "Youhou !", en: "Wheee!" },
    action: { type: "turnAround" },
  },
  {
    pattern: /\b(hello|hi|hey|bonjour|salut|coucou)\b/i,
    response: { fr: "Bonjour ! Ravi de te parler.", en: "Hello! Nice to talk to you." },
    action: { type: "wiggleAntennas" },
  },
  {
    pattern: /\b(help|what can you do|commands|aide|qu'?est[- ]ce que tu (sais|peux) faire|que sais[- ]tu faire)\b/i,
    response: {
      fr: "Je peux : me r\u00e9veiller, dormir, regarder \u00e0 gauche/droite/haut/bas, te regarder, me retourner, et dire bonjour !",
      en: "I can: wake up, go to sleep, look left/right/up/down, look at me, turn around, and say hello!",
    },
    action: { type: "nod" },
  },
];

/**
 * Pick the response string for the detected language, falling back to French.
 */
function localize(response, lang) {
  if (typeof response === "string") return response;
  return response[lang] || response.fr;
}

/**
 * Parse spoken text into a response and optional robot action.
 * @param {string} text
 * @param {string} language  Detected language code, e.g. "fr", "en"
 * @returns {{ response: string, action?: { type: string, params?: object } }}
 */
export function parse(text, language = "fr") {
  const trimmed = text.trim();
  if (!trimmed) {
    return { response: localize({ fr: "Je n'ai pas compris.", en: "I didn't catch that." }, language) };
  }

  for (const cmd of COMMANDS) {
    if (cmd.pattern.test(trimmed)) {
      return {
        response: localize(cmd.response, language),
        action: cmd.action,
      };
    }
  }

  // Fallback — echo what we heard with a quizzical reaction
  const fallback = language === "en"
    ? `I heard: "${trimmed}"`
    : `J'ai entendu : \u00ab ${trimmed} \u00bb`;
  return {
    response: fallback,
    action: { type: "headTilt" },
  };
}