"""Day phases and Pace (rules R1/R2) — wall-clock stretch model."""
from __future__ import annotations

from enum import Enum
from typing import Optional

class Pace(str, Enum):
    RELAXED = "Relaxed"
    NORMAL = "Normal"
    BRISK = "Brisk"

class Phase(str, Enum):
    PREP = "PREP"
    MORNING = "MORNING"
    AFTERNOON = "AFTERNOON"
    DUSK = "DUSK"
    CLOSING = "CLOSING"
    NIGHT = "NIGHT"

PHASE_ORDER = [
    Phase.PREP,
    Phase.MORNING,
    Phase.AFTERNOON,
    Phase.DUSK,
    Phase.CLOSING,
    Phase.NIGHT,
]

# defaults mirror content/tuning/mvp_rules.json
DEFAULT_PACE = {
    Pace.RELAXED: 1.5,
    Pace.NORMAL: 1.0,
    Pace.BRISK: 0.75,
}

DEFAULT_BASE_SEC = {
    Phase.PREP: None,
    Phase.MORNING: 90.0,
    Phase.AFTERNOON: 120.0,
    Phase.DUSK: 90.0,
    Phase.CLOSING: 45.0,
    Phase.NIGHT: None,
}

class DayCycle:
    """Discrete day cycle. phase_elapsed accumulates wall delta; limit *= pace."""

    def __init__(
        self,
        pace: Pace = Pace.NORMAL,
        pace_multipliers: Optional[dict] = None,
        base_sec: Optional[dict] = None,
        day_index: int = 0,
        phase: Phase = Phase.PREP,
    ):
        self.pace = pace
        self.pace_multipliers = {
            Pace(k) if not isinstance(k, Pace) else k: float(v)
            for k, v in (pace_multipliers or DEFAULT_PACE).items()
        }
        self.base_sec = {}
        src = base_sec or DEFAULT_BASE_SEC
        for ph, val in src.items():
            key = Phase(ph) if not isinstance(ph, Phase) else ph
            self.base_sec[key] = None if val is None else float(val)
        self.day_index = day_index
        self.phase = phase if isinstance(phase, Phase) else Phase(phase)
        self.phase_elapsed = 0.0
        self.paused = False
        self._listeners = []

    @property
    def pace_multiplier(self) -> float:
        return float(self.pace_multipliers[self.pace])

    def phase_limit(self) -> Optional[float]:
        base = self.base_sec.get(self.phase)
        if base is None:
            return None
        return base * self.pace_multiplier

    def set_paused(self, value: bool) -> None:
        self.paused = bool(value)

    def set_pace(self, pace: Pace) -> None:
        self.pace = Pace(pace)

    def tick(self, delta: float) -> bool:
        """Advance wall time by delta seconds. Returns True if phase advanced."""
        if self.paused or delta <= 0:
            return False
        limit = self.phase_limit()
        if limit is None:
            return False  # PREP / NIGHT: button only
        # CRITICAL: do NOT multiply delta by pace
        self.phase_elapsed += float(delta)
        if self.phase_elapsed >= limit:
            self.advance_phase()
            return True
        return False

    def confirm_open(self) -> None:
        if self.phase != Phase.PREP:
            raise ValueError("confirm_open only in PREP")
        self._go(Phase.MORNING)

    def confirm_sleep(self) -> None:
        if self.phase != Phase.NIGHT:
            raise ValueError("confirm_sleep only in NIGHT")
        self.day_index += 1
        self._go(Phase.PREP)

    def skip_phase(self) -> None:
        limit = self.phase_limit()
        if limit is None:
            if self.phase == Phase.PREP:
                self.confirm_open()
            elif self.phase == Phase.NIGHT:
                self.confirm_sleep()
            return
        self.phase_elapsed = limit
        self.advance_phase()

    def advance_phase(self) -> None:
        idx = PHASE_ORDER.index(self.phase)
        if idx >= len(PHASE_ORDER) - 1:
            # stay NIGHT until sleep
            self.phase = Phase.NIGHT
            self.phase_elapsed = 0.0
            return
        self._go(PHASE_ORDER[idx + 1])

    def _go(self, phase: Phase) -> None:
        self.phase = phase
        self.phase_elapsed = 0.0
        for cb in self._listeners:
            cb(self.phase)

    def on_phase_enter(self, cb) -> None:
        self._listeners.append(cb)

    def to_dict(self) -> dict:
        return {
            "day_index": self.day_index,
            "phase": self.phase.value,
            "phase_elapsed": self.phase_elapsed,
            "pace": self.pace.value,
            "paused": self.paused,
        }

    @classmethod
    def from_dict(cls, data: dict, **kwargs) -> "DayCycle":
        d = cls(
            pace=Pace(data.get("pace", "Normal")),
            day_index=int(data.get("day_index", 0)),
            phase=Phase(data.get("phase", "PREP")),
            **kwargs,
        )
        d.phase_elapsed = float(data.get("phase_elapsed", 0.0))
        d.paused = bool(data.get("paused", False))
        return d

def auto_phase_total(pace: Pace = Pace.NORMAL, base_sec=None, pace_multipliers=None) -> float:
    d = DayCycle(pace=pace, base_sec=base_sec, pace_multipliers=pace_multipliers)
    total = 0.0
    for ph in (Phase.MORNING, Phase.AFTERNOON, Phase.DUSK, Phase.CLOSING):
        b = d.base_sec[ph]
        total += b * d.pace_multipliers[pace]
    return total
# reseal-product R46