"""
Handoff Protocol (帧交接协议)
NovelMaster Core Engine - 状态管理器

特性:
- LOD (视锥剔除): 只精确交接在场人物
- Tick (全局时钟): 多线程悬置动作记录
- 休眠背景人物惰性更新
"""

from dataclasses import dataclass, field
from typing import List, Optional, Dict, Any
from enum import Enum
import time


class CharacterStatus(Enum):
    ACTIVE = "active"
    DORMANT = "dormant"
    SUSPENDED = "suspended"


class ActionType(Enum):
    DIALOGUE = "dialogue"
    MOVEMENT = "movement"
    COMBAT = "combat"
    SKILL = "skill"
    MENTAL = "mental"


class Urgency(Enum):
    CRITICAL = "critical"
    NORMAL = "normal"
    LOW = "low"


@dataclass
class Vector3D:
    """3D坐标"""
    x: float
    y: float
    z: float


@dataclass
class Character:
    """角色"""
    id: str
    name: str
    status: CharacterStatus = CharacterStatus.ACTIVE
    position: Optional[Vector3D] = None
    last_update_tick: int = 0
    pending_actions: List['ImminentAction'] = field(default_factory=list)


@dataclass
class ImminentAction:
    """悬置动作"""
    id: str
    character_id: str
    type: ActionType
    description: str
    urgency: Urgency = Urgency.NORMAL
    tick: int = 0


@dataclass
class WorldState:
    """世界状态"""
    location: str
    time_of_day: str
    weather: Optional[str] = None
    tension_level: int = 50  # 0-100
    hook_pressure: int = 0   # 负债池压强


@dataclass
class HandoffMetadata:
    """交接元数据"""
    chapter_number: int
    scene_number: int
    previous_chapter_summary: str
    next_chapter_hint: Optional[str] = None


@dataclass
class HandoffFrame:
    """交接帧"""
    tick: int
    timestamp: float
    active_characters: List[Character]
    suspended_characters: List[Character]
    imminent_actions: List[ImminentAction]
    world_state: WorldState
    metadata: HandoffMetadata


def cull_to_viewshed(characters: List[Character], view_center: Vector3D, radius: float) -> List[Character]:
    """LOD视锥剔除 - 只保留视野内角色"""
    result = []
    for char in characters:
        if not char.position:
            continue
        distance = ((char.position.x - view_center.x) ** 2 +
                   (char.position.y - view_center.y) ** 2 +
                   (char.position.z - view_center.z) ** 2) ** 0.5
        if distance <= radius:
            result.append(char)
    return result


def create_handoff_frame(
    current_tick: int,
    all_characters: List[Character],
    world_state: WorldState,
    metadata: HandoffMetadata
) -> HandoffFrame:
    """创建交接帧"""
    active_characters = [c for c in all_characters if c.status == CharacterStatus.ACTIVE]
    suspended_characters = [c for c in all_characters if c.status == CharacterStatus.SUSPENDED]
    
    # 收集所有悬置动作
    imminent_actions = []
    for char in all_characters:
        imminent_actions.extend(char.pending_actions)
    
    return HandoffFrame(
        tick=current_tick,
        timestamp=time.time(),
        active_characters=active_characters,
        suspended_characters=suspended_characters,
        imminent_actions=imminent_actions,
        world_state=world_state,
        metadata=metadata
    )


def merge_handoff_frames(frames: List[HandoffFrame]) -> HandoffFrame:
    """合并多个交接帧"""
    if not frames:
        raise ValueError("No frames to merge")
    
    latest_frame = max(frames, key=lambda f: f.tick)
    
    return HandoffFrame(
        tick=latest_frame.tick,
        timestamp=latest_frame.timestamp,
        active_characters=[c for f in frames for c in f.active_characters],
        suspended_characters=[c for f in frames for c in f.suspended_characters],
        imminent_actions=[a for f in frames for a in f.imminent_actions],
        world_state=latest_frame.world_state,
        metadata=latest_frame.metadata
    )


def to_dict(frame: HandoffFrame) -> Dict[str, Any]:
    """序列化为字典"""
    return {
        "tick": frame.tick,
        "timestamp": frame.timestamp,
        "active_characters": [
            {
                "id": c.id,
                "name": c.name,
                "status": c.status.value,
                "position": {"x": c.position.x, "y": c.position.y, "z": c.position.z} if c.position else None
            }
            for c in frame.active_characters
        ],
        "suspended_characters": [c.id for c in frame.suspended_characters],
        "imminent_actions": [
            {
                "id": a.id,
                "character_id": a.character_id,
                "type": a.type.value,
                "description": a.description,
                "urgency": a.urgency.value
            }
            for a in frame.imminent_actions
        ],
        "world_state": {
            "location": frame.world_state.location,
            "time_of_day": frame.world_state.time_of_day,
            "weather": frame.world_state.weather,
            "tension_level": frame.world_state.tension_level,
            "hook_pressure": frame.world_state.hook_pressure
        },
        "metadata": {
            "chapter_number": frame.metadata.chapter_number,
            "scene_number": frame.metadata.scene_number,
            "previous_chapter_summary": frame.metadata.previous_chapter_summary,
            "next_chapter_hint": frame.metadata.next_chapter_hint
        }
    }