"""
NeuroSploit v3 - Dashboard API Endpoints
"""
from typing import List
from fastapi import APIRouter, Depends
from sqlalchemy.ext.asyncio import AsyncSession
from sqlalchemy import select, func
from datetime import datetime, timedelta

from backend.db.database import get_db
from backend.models import Scan, Vulnerability, Endpoint

router = APIRouter()


@router.get("/stats")
async def get_dashboard_stats(db: AsyncSession = Depends(get_db)):
    """Get overall dashboard statistics"""
    # Total scans
    total_scans_result = await db.execute(select(func.count()).select_from(Scan))
    total_scans = total_scans_result.scalar() or 0

    # Running scans
    running_result = await db.execute(
        select(func.count()).select_from(Scan).where(Scan.status == "running")
    )
    running_scans = running_result.scalar() or 0

    # Completed scans
    completed_result = await db.execute(
        select(func.count()).select_from(Scan).where(Scan.status == "completed")
    )
    completed_scans = completed_result.scalar() or 0

    # Total vulnerabilities by severity
    vuln_counts = {}
    for severity in ["critical", "high", "medium", "low", "info"]:
        result = await db.execute(
            select(func.count()).select_from(Vulnerability).where(Vulnerability.severity == severity)
        )
        vuln_counts[severity] = result.scalar() or 0

    total_vulns = sum(vuln_counts.values())

    # Total endpoints
    endpoints_result = await db.execute(select(func.count()).select_from(Endpoint))
    total_endpoints = endpoints_result.scalar() or 0

    # Recent activity (last 7 days)
    week_ago = datetime.utcnow() - timedelta(days=7)
    recent_scans_result = await db.execute(
        select(func.count()).select_from(Scan).where(Scan.created_at >= week_ago)
    )
    recent_scans = recent_scans_result.scalar() or 0

    recent_vulns_result = await db.execute(
        select(func.count()).select_from(Vulnerability).where(Vulnerability.created_at >= week_ago)
    )
    recent_vulns = recent_vulns_result.scalar() or 0

    return {
        "scans": {
            "total": total_scans,
            "running": running_scans,
            "completed": completed_scans,
            "recent": recent_scans
        },
        "vulnerabilities": {
            "total": total_vulns,
            "critical": vuln_counts["critical"],
            "high": vuln_counts["high"],
            "medium": vuln_counts["medium"],
            "low": vuln_counts["low"],
            "info": vuln_counts["info"],
            "recent": recent_vulns
        },
        "endpoints": {
            "total": total_endpoints
        }
    }


@router.get("/recent")
async def get_recent_activity(
    limit: int = 10,
    db: AsyncSession = Depends(get_db)
):
    """Get recent scan activity"""
    # Recent scans
    scans_query = select(Scan).order_by(Scan.created_at.desc()).limit(limit)
    scans_result = await db.execute(scans_query)
    recent_scans = scans_result.scalars().all()

    # Recent vulnerabilities
    vulns_query = select(Vulnerability).order_by(Vulnerability.created_at.desc()).limit(limit)
    vulns_result = await db.execute(vulns_query)
    recent_vulns = vulns_result.scalars().all()

    return {
        "recent_scans": [s.to_dict() for s in recent_scans],
        "recent_vulnerabilities": [v.to_dict() for v in recent_vulns]
    }


@router.get("/findings")
async def get_recent_findings(
    limit: int = 20,
    severity: str = None,
    db: AsyncSession = Depends(get_db)
):
    """Get recent vulnerability findings"""
    query = select(Vulnerability).order_by(Vulnerability.created_at.desc())

    if severity:
        query = query.where(Vulnerability.severity == severity)

    query = query.limit(limit)
    result = await db.execute(query)
    vulnerabilities = result.scalars().all()

    return {
        "findings": [v.to_dict() for v in vulnerabilities],
        "total": len(vulnerabilities)
    }


@router.get("/vulnerability-types")
async def get_vulnerability_distribution(db: AsyncSession = Depends(get_db)):
    """Get vulnerability distribution by type"""
    query = select(
        Vulnerability.vulnerability_type,
        func.count(Vulnerability.id).label("count")
    ).group_by(Vulnerability.vulnerability_type)

    result = await db.execute(query)
    distribution = result.all()

    return {
        "distribution": [
            {"type": row[0], "count": row[1]}
            for row in distribution
        ]
    }


@router.get("/scan-history")
async def get_scan_history(
    days: int = 30,
    db: AsyncSession = Depends(get_db)
):
    """Get scan history for charts"""
    start_date = datetime.utcnow() - timedelta(days=days)

    # Get scans grouped by date
    scans = await db.execute(
        select(Scan).where(Scan.created_at >= start_date).order_by(Scan.created_at)
    )
    all_scans = scans.scalars().all()

    # Group by date
    history = {}
    for scan in all_scans:
        date_str = scan.created_at.strftime("%Y-%m-%d")
        if date_str not in history:
            history[date_str] = {
                "date": date_str,
                "scans": 0,
                "vulnerabilities": 0,
                "critical": 0,
                "high": 0
            }
        history[date_str]["scans"] += 1
        history[date_str]["vulnerabilities"] += scan.total_vulnerabilities
        history[date_str]["critical"] += scan.critical_count
        history[date_str]["high"] += scan.high_count

    return {"history": list(history.values())}