"""Overview stats and SSE activity stream."""

import asyncio
import json
import subprocess
import sqlite3
from datetime import date
from fastapi import APIRouter
from sse_starlette.sse import EventSourceResponse

import sys
from pathlib import Path
sys.path.insert(0, str(Path(__file__).parent.parent))

from lib_bridge import (
    portainer_list_containers, ENDPOINTS, ollama_available,
    GMAIL_DB, DVISH_DB, PROTON_DB, RESTART_DB, LOG_DIR, OLLAMA_URL,
)
from log_parser import get_recent_events, tail_logs, get_new_lines

router = APIRouter(tags=["overview"])


def _count_today_emails(db_path: Path) -> int:
    """Count emails processed today from a processed.db file."""
    if not db_path.exists():
        return 0
    try:
        today = date.today().isoformat()
        conn = sqlite3.connect(f"file:{db_path}?mode=ro", uri=True)
        cur = conn.execute(
            "SELECT COUNT(*) FROM processed WHERE processed_at LIKE ?",
            (f"{today}%",),
        )
        count = cur.fetchone()[0]
        conn.close()
        return count
    except Exception:
        return 0


def _count_unhealthy(db_path: Path) -> int:
    """Count unhealthy containers from stack-restart.db."""
    if not db_path.exists():
        return 0
    try:
        conn = sqlite3.connect(f"file:{db_path}?mode=ro", uri=True)
        cur = conn.execute("SELECT COUNT(*) FROM unhealthy_tracking")
        count = cur.fetchone()[0]
        conn.close()
        return count
    except Exception:
        return 0


def _gpu_info() -> dict:
    """Get GPU info from olares via SSH."""
    try:
        result = subprocess.run(
            ["ssh", "-o", "ConnectTimeout=3", "olares",
             "nvidia-smi --query-gpu=temperature.gpu,power.draw,power.limit,"
             "memory.used,memory.total,utilization.gpu --format=csv,noheader,nounits"],
            capture_output=True, text=True, timeout=10,
        )
        if result.returncode != 0:
            return {"available": False}
        parts = [p.strip() for p in result.stdout.strip().split(",")]

        def _f(v):
            try:
                return float(v)
            except (ValueError, TypeError):
                return None

        if len(parts) >= 6:
            return {
                "available": True,
                "temp_c": _f(parts[0]),
                "power_draw_w": _f(parts[1]),
                "power_limit_w": _f(parts[2]),
                "memory_used_mb": _f(parts[3]),
                "memory_total_mb": _f(parts[4]),
                "utilization_pct": _f(parts[5]),
            }
    except Exception:
        pass
    return {"available": False}


@router.get("/stats/overview")
def stats_overview():
    """Aggregate overview stats."""
    # Container counts
    container_counts = {}
    total = 0
    for ep_name in ENDPOINTS:
        try:
            containers = portainer_list_containers(ep_name)
            running = sum(1 for c in containers if c.get("State") == "running")
            container_counts[ep_name] = {"total": len(containers), "running": running}
            total += len(containers)
        except Exception:
            container_counts[ep_name] = {"total": 0, "running": 0, "error": True}

    # GPU
    gpu = _gpu_info()

    # Email counts
    email_today = {
        "gmail": _count_today_emails(GMAIL_DB),
        "dvish": _count_today_emails(DVISH_DB),
        "proton": _count_today_emails(PROTON_DB),
    }
    email_today["total"] = sum(email_today.values())

    # Unhealthy
    unhealthy = _count_unhealthy(RESTART_DB)

    # Ollama
    ollama_up = ollama_available(OLLAMA_URL)

    return {
        "containers": {"total": total, "by_endpoint": container_counts},
        "gpu": gpu,
        "email_today": email_today,
        "unhealthy_count": unhealthy,
        "ollama_available": ollama_up,
    }


@router.get("/activity")
async def activity_stream():
    """SSE stream of today's automation events."""

    async def event_generator():
        # Send initial batch
        events = get_recent_events(LOG_DIR)
        yield {"event": "init", "data": json.dumps(events)}

        # Poll for new events
        positions = tail_logs(LOG_DIR)
        while True:
            await asyncio.sleep(5)
            new_events, positions = get_new_lines(LOG_DIR, positions)
            if new_events:
                yield {"event": "update", "data": json.dumps(new_events)}

    return EventSourceResponse(event_generator())