"""Collector — local relay between Extension (file-based) and Gateway (HTTP).

The Collector runs on the local PC alongside the AG IDE.
It bridges the gap between the Extension (which writes to local bridge/ files)
and the remote Gateway (which manages Discord).

Flow:
  Extension → bridge/pending/ → Collector → POST Gateway /api/pending
  Gateway /api/response/{rid} → Collector → bridge/response/ → Extension
  Gateway /api/commands/{project} → Collector → bridge/commands/ → Extension
"""

import asyncio
import json
import time
import logging
from pathlib import Path

from bridge import LocalTransport, RemoteTransport
from config import Config

logger = logging.getLogger(__name__)


class CollectorBridge:
    """Bridges local file-based bridge with remote Gateway API.

    Periodically:
    1. Scans local pending/ → forwards new ones to Gateway
    2. Polls Gateway for responses → writes to local response/
    3. Polls Gateway for commands → writes to local commands/
    """

    def __init__(self, local: LocalTransport, remote: RemoteTransport, project_name: str):
        self.local = local
        self.remote = remote
        self.project_name = project_name
        self._forwarded_pending: set[str] = set()  # already forwarded request IDs
        self._poll_interval = 3  # seconds
        self._running = False

    async def start(self):
        """Start the Collector polling loops."""
        self._running = True
        logger.info(f"[COLLECTOR] started for project={self.project_name}")
        await asyncio.gather(
            self._forward_pending_loop(),
            self._poll_responses_loop(),
            self._poll_commands_loop(),
        )

    async def stop(self):
        """Stop the Collector."""
        self._running = False
        logger.info("[COLLECTOR] stopped")

    # ─── Forward local pending → Gateway ───

    async def _forward_pending_loop(self):
        """Scan local pending/ and forward new requests to Gateway."""
        while self._running:
            try:
                for fname in self.local.list_json_files("pending"):
                    rid = fname.replace(".json", "")
                    if rid in self._forwarded_pending:
                        continue

                    data = self.local.read_json("pending", fname)
                    if data is None or data.get("status") != "pending":
                        continue

                    # Forward to Gateway
                    self.remote.write_json("pending", fname, data)
                    self._forwarded_pending.add(rid)
                    logger.info(f"[COLLECTOR] → Gateway: pending {rid[:12]}")

                # Clean up stale forwarded tracking (keep last 200)
                if len(self._forwarded_pending) > 200:
                    self._forwarded_pending = set(list(self._forwarded_pending)[-100:])

            except Exception as e:
                logger.error(f"[COLLECTOR] forward_pending error: {e}")

            await asyncio.sleep(self._poll_interval)

    # ─── Poll Gateway responses → local ───

    async def _poll_responses_loop(self):
        """Poll Gateway for responses and write them locally for Extension."""
        while self._running:
            try:
                # Check each forwarded pending for a response
                for rid in list(self._forwarded_pending):
                    data = self.remote.read_json("response", f"{rid}.json")
                    if data is None or data.get("waiting"):
                        continue

                    # Write response locally for Extension to pick up
                    self.local.write_json("response", f"{rid}.json", data)
                    # Also delete local pending file (Extension expects this)
                    self.local.delete_file("pending", f"{rid}.json")
                    self._forwarded_pending.discard(rid)
                    approved = data.get("approved", "?")
                    logger.info(f"[COLLECTOR] ← Gateway: response {rid[:12]} approved={approved}")

            except Exception as e:
                logger.error(f"[COLLECTOR] poll_responses error: {e}")

            await asyncio.sleep(self._poll_interval)

    # ─── Poll Gateway commands → local ───

    async def _poll_commands_loop(self):
        """Poll Gateway for commands and write them locally for Extension."""
        while self._running:
            try:
                commands = self.remote.poll_commands(self.project_name)
                for cmd in commands:
                    cmd_id = cmd.get("id", str(int(time.time() * 1000)))
                    fname = f"{cmd_id}.json"
                    self.local.write_json("commands", fname, cmd)
                    logger.info(f"[COLLECTOR] ← Gateway: command {cmd.get('text', '?')[:30]}")

            except Exception as e:
                logger.error(f"[COLLECTOR] poll_commands error: {e}")

            await asyncio.sleep(self._poll_interval)