#!/usr/bin/env python3
"""
Side-chat to main-chat work siphon — siphon action (INTEGRATED).

Changes vs original (integrator; agent 3 of 5 never delivered, so the
minimal reversible versions below stand in for its authorship/dedup work):
  - format_siphon imported from detect (single definition; honest labeling
    + honest authorship live there).
  - Deduplication is PERSISTENT: siphoned message IDs are stored as JSON
    on disk (SIPHON_STATE_DIR or ~/.siphon-state/siphoned_ids.json) so a
    restart can never re-relay. In-memory set kept as a fast path.
  - mark_siphoned() writes through to disk on every call.

Safety (unchanged):
  - Rate limited (max N siphons per hour per thread)
  - Never posts full message content
  - Respects opt-out registry
  - Deduplicates (same message_id never siphoned twice, even across restarts)
"""

import json
import os
import time
from dataclasses import dataclass, field
from typing import Callable, Optional

from detect import SiphonHit, is_opted_out, format_siphon  # noqa: F401 (re-export)


# --- Rate limiting ---

@dataclass
class RateLimiter:
    max_per_hour: int = 5
    _timestamps: dict = field(default_factory=dict)  # thread_id -> [ts, ...]

    def allow(self, thread_id: str) -> bool:
        now = time.time()
        stamps = self._timestamps.get(thread_id, [])
        # Prune older than 1 hour
        stamps = [s for s in stamps if now - s < 3600]
        if len(stamps) >= self.max_per_hour:
            return False
        stamps.append(now)
        self._timestamps[thread_id] = stamps
        return True


# --- Deduplication (persistent) ---

_STATE_DIR = os.environ.get(
    "SIPHON_STATE_DIR", os.path.expanduser("~/.siphon-state"))
DEDUP_FILE = os.path.join(_STATE_DIR, "siphoned_ids.json")
_DEDUP_MAX_IDS = 5000  # bound disk growth; oldest evicted first


def _load_siphoned() -> set:
    try:
        with open(DEDUP_FILE) as f:
            data = json.load(f)
        ids = data.get("ids", []) if isinstance(data, dict) else []
        return set(ids)
    except (OSError, ValueError):
        return set()


def _save_siphoned(ids: set) -> None:
    try:
        os.makedirs(_STATE_DIR, exist_ok=True)
        trimmed = sorted(ids)[-_DEDUP_MAX_IDS:]
        tmp = DEDUP_FILE + ".tmp"
        with open(tmp, "w") as f:
            json.dump({"ids": trimmed, "updated": time.time()}, f)
        os.replace(tmp, DEDUP_FILE)
    except OSError:
        pass  # dedup degrades to in-memory; never crash the relay on IO


_siphoned_ids: set = _load_siphoned()


def already_siphoned(message_id: str) -> bool:
    return message_id in _siphoned_ids


def mark_siphoned(message_id: str):
    _siphoned_ids.add(message_id)
    _save_siphoned(_siphoned_ids)


def siphoned_count() -> int:
    return len(_siphoned_ids)


# --- Siphon action ---

CATEGORY_EMOJI = {
    "COMPLETED": "✅",
    "BLOCKER": "🚧",
    "DECISION": "❓",
    "ALERT": "🚨",
    "MILESTONE": "🎯",
}


def siphon(hit: SiphonHit,
           agent_name: str,
           post_to_main: Callable[[str], bool],
           limiter: Optional[RateLimiter] = None) -> bool:
    """
    Execute the siphon: post summary to main chat.

    post_to_main: callable that posts text to main chat, returns True on success.
    Returns True if siphoned, False if suppressed.
    """
    # Safety checks
    if is_opted_out(hit.thread_id):
        return False
    if already_siphoned(hit.message_id):
        return False

    lim = limiter or RateLimiter()
    if not lim.allow(hit.thread_id):
        return False

    text = format_siphon(hit, agent_name)
    ok = post_to_main(text)
    if ok:
        mark_siphoned(hit.message_id)
    return ok