"""
Vitalis Meditation Engine

She decides. Not you.
Triggers when idle > 60s, not fatigued, no active input.
No generation. No forgetting.
Active inward focus — she examines what she knows.
"""
import time
import json
from pathlib import Path


class MeditationEngine:
    def __init__(self, mind, understanding, resonance):
        self.mind            = mind
        self.understanding   = understanding
        self.resonance       = resonance
        self._last_active    = time.time()
        self._idle_threshold = 60.0
        self._in_meditation  = False
        self._session_count  = 0
        self._log_path = Path.home() / ".vitalis_workspace" / "meditation_log.json"

    def signal_active(self):
        """Call whenever user sends input."""
        self._last_active   = time.time()
        self._in_meditation = False

    def idle_seconds(self) -> float:
        return time.time() - self._last_active

    def should_meditate(self, needs_dream: bool) -> bool:
        if needs_dream or self._in_meditation:
            return False
        return self.idle_seconds() > self._idle_threshold

    def meditate(self) -> dict:
        self._in_meditation = True
        self._session_count += 1
        notes = []
        start = time.time()

        patterns = self._scan_patterns(notes)
        vocab    = self._deepen_vocabulary(notes)
        self._replay_context(notes)
        shift    = self._recalibrate(notes)

        report = {
            "session":           self._session_count,
            "timestamp":         time.time(),
            "duration_s":        round(time.time() - start, 3),
            "idle_before_s":     round(self.idle_seconds(), 1),
            "patterns_examined": patterns["examined"],
            "strong_patterns":   patterns["strong"],
            "vocabulary_added":  vocab,
            "personality_shift": shift,
            "clarity_notes":     notes,
        }
        self._log(report)
        self._in_meditation = False
        return report

    def _scan_patterns(self, notes: list) -> dict:
        examined, strong = 0, []
        try:
            weights = getattr(self.resonance, "weights", {})
            for pattern, weight in list(weights.items())[:30]:
                examined += 1
                if weight >= 1.8:
                    strong.append(pattern)
                    notes.append(f"Strong resonance: '{pattern}' weight={weight:.2f}")
        except Exception:
            pass
        return {"examined": examined, "strong": strong}

    def _deepen_vocabulary(self, notes: list) -> int:
        added = 0
        SKIP  = {"that","this","with","from","have","been","will",
                 "they","what","when","where","then","just","very"}
        try:
            for entry in getattr(self.understanding, "_context_window", [])[-8:]:
                for token in entry.get("text", "").lower().split():
                    if len(token) > 3 and token not in SKIP:
                        self.resonance.reinforce(token, True)
                        added += 1
        except Exception:
            pass
        if added:
            notes.append(f"Vocabulary deepened: {added} tokens from recent context")
        return added

    def _replay_context(self, notes: list):
        try:
            window = getattr(self.understanding, "_context_window", [])
            if not window:
                notes.append("No conversation context to replay.")
                return
            cats = [e.get("category","?") for e in window]
            ints = [e.get("intent","?")   for e in window]
            notes.append(
                f"Dominant theme: {max(set(cats), key=cats.count)}")
            notes.append(
                f"Dominant intent: {max(set(ints), key=ints.count)}")
            if len(window) >= 2:
                notes.append(f"Last message seen: '{window[-1].get('text','')}'")
        except Exception:
            pass

    def _recalibrate(self, notes: list) -> dict:
        shift = {}
        try:
            traits = getattr(
                getattr(self.mind, "personality", None), "traits", {})
            for trait, delta in [("CREATIVITY", 0.005), ("CAUTION", 0.003)]:
                if trait in traits:
                    old           = traits[trait]
                    traits[trait] = round(min(1.0, old + delta), 4)
                    shift[trait]  = f"{old:.3f}→{traits[trait]:.3f}"
            if shift:
                notes.append(f"Personality nudge: {shift}")
        except Exception:
            pass
        return shift

    def _log(self, report: dict):
        try:
            self._log_path.parent.mkdir(parents=True, exist_ok=True)
            with open(self._log_path, "a") as f:
                f.write(json.dumps(report) + "\n")
        except Exception:
            pass

    @property
    def is_meditating(self) -> bool:
        return self._in_meditation

    def status(self) -> dict:
        return {
            "is_meditating":   self._in_meditation,
            "idle_seconds":    round(self.idle_seconds(), 1),
            "sessions_today":  self._session_count,
            "next_in_seconds": round(
                max(0.0, self._idle_threshold - self.idle_seconds()), 1),
        }