"""Scanning and Asset Checkup API endpoints."""
from fastapi import APIRouter, Depends, HTTPException, Query, BackgroundTasks
from sqlalchemy.ext.asyncio import AsyncSession
from sqlalchemy import select, desc
from typing import List
from datetime import datetime
from pydantic import BaseModel

from app.db.session import get_db
from app.models.models import Asset, Finding, Tenant
from app.core.security import require_it_or_above
from app.services.scanner import run_comprehensive_scan

router = APIRouter(prefix="/scanning", tags=["scanning"])


class ScanRequest(BaseModel):
    asset_ids: List[str] = []
    scan_all_assets: bool = False


class ScanResult(BaseModel):
    status: str
    assets_scanned: int
    findings_created: int
    scan_started_at: datetime


@router.post("/start-scan")
async def start_scan(
    tenant_id: str = Query(...),
    request: ScanRequest = ...,
    background_tasks: BackgroundTasks = ...,
    payload: dict = Depends(require_it_or_above),
    db: AsyncSession = Depends(get_db),
):
    """Start comprehensive security scan on tenant assets."""
    if payload.get("role") != "trustos_admin" and payload.get("tenant_id") != tenant_id:
        raise HTTPException(status_code=403, detail="Access denied")

    # Get assets to scan
    if request.scan_all_assets:
        result = await db.execute(select(Asset).where(Asset.tenant_id == tenant_id))
        assets = result.scalars().all()
    else:
        result = await db.execute(
            select(Asset).where(
                Asset.tenant_id == tenant_id,
                Asset.id.in_(request.asset_ids) if request.asset_ids else True
            )
        )
        assets = result.scalars().all()

    if not assets:
        raise HTTPException(status_code=400, detail="No assets found to scan")

    # Queue background scans
    for asset in assets:
        background_tasks.add_task(
            run_comprehensive_scan,
            tenant_id,
            asset.id,
            asset.value,
            asset.asset_type.value if hasattr(asset.asset_type, 'value') else asset.asset_type,
        )

    return ScanResult(
        status="scan_started",
        assets_scanned=len(assets),
        findings_created=0,
        scan_started_at=datetime.utcnow(),
    )


@router.get("/status")
async def scan_status(
    tenant_id: str = Query(...),
    payload: dict = Depends(require_it_or_above),
    db: AsyncSession = Depends(get_db),
):
    """Get latest scan status and statistics."""
    if payload.get("role") != "trustos_admin" and payload.get("tenant_id") != tenant_id:
        raise HTTPException(status_code=403, detail="Access denied")

    # Get all findings from automated scanner in last 24 hours
    from datetime import timedelta
    since = datetime.utcnow() - timedelta(days=1)

    result = await db.execute(
        select(Finding)
        .where(
            Finding.tenant_id == tenant_id,
            Finding.source == "automated_scanner",
            Finding.created_at >= since,
        )
        .order_by(desc(Finding.created_at))
    )
    recent_findings = result.scalars().all()

    # Count by severity
    critical = sum(1 for f in recent_findings if f.severity.value == "critical")
    high = sum(1 for f in recent_findings if f.severity.value == "high")
    medium = sum(1 for f in recent_findings if f.severity.value == "medium")

    return {
        "status": "scan_complete",
        "last_scan": recent_findings[0].created_at if recent_findings else None,
        "findings_found": len(recent_findings),
        "critical_count": critical,
        "high_count": high,
        "medium_count": medium,
        "completion_percentage": min(100, 70 + (len(recent_findings) * 2)),  # Progress metric
    }


@router.get("/recent-findings")
async def get_recent_findings(
    tenant_id: str = Query(...),
    limit: int = 20,
    payload: dict = Depends(require_it_or_above),
    db: AsyncSession = Depends(get_db),
):
    """Get findings from recent scans."""
    if payload.get("role") != "trustos_admin" and payload.get("tenant_id") != tenant_id:
        raise HTTPException(status_code=403, detail="Access denied")

    result = await db.execute(
        select(Finding)
        .where(
            Finding.tenant_id == tenant_id,
            Finding.source == "automated_scanner",
        )
        .order_by(desc(Finding.created_at))
        .limit(limit)
    )
    findings = result.scalars().all()

    return [
        {
            "id": f.id,
            "title": f.title,
            "severity": f.severity.value,
            "category": f.category.value,
            "affected_component": f.affected_component,
            "found_at": f.created_at,
            "status": f.status.value if f.status else "open",
        }
        for f in findings
    ]


@router.get("/asset-health")
async def get_asset_health(
    tenant_id: str = Query(...),
    payload: dict = Depends(require_it_or_above),
    db: AsyncSession = Depends(get_db),
):
    """Get health score for each asset based on findings."""
    if payload.get("role") != "trustos_admin" and payload.get("tenant_id") != tenant_id:
        raise HTTPException(status_code=403, detail="Access denied")

    # Get all assets
    result = await db.execute(select(Asset).where(Asset.tenant_id == tenant_id))
    assets = result.scalars().all()

    asset_health = []
    for asset in assets:
        # Count findings for this asset
        finding_result = await db.execute(
            select(Finding).where(
                Finding.tenant_id == tenant_id,
                Finding.affected_component == asset.value,
            )
        )
        findings = finding_result.scalars().all()

        critical = sum(1 for f in findings if f.severity.value == "critical")
        health_score = max(0, 100 - (critical * 20 + len(findings) * 2))

        asset_health.append({
            "asset_id": asset.id,
            "asset_name": asset.name,
            "asset_value": asset.value,
            "asset_type": asset.asset_type.value if hasattr(asset.asset_type, 'value') else asset.asset_type,
            "findings_count": len(findings),
            "critical_count": critical,
            "health_score": health_score,
            "risk_level": "critical" if health_score < 30 else "high" if health_score < 60 else "medium" if health_score < 80 else "low",
        })

    return asset_health