"""Web UI routes — Jinja2 + htmx pages."""

import datetime

from fastapi import APIRouter, Depends, Request
from fastapi.responses import HTMLResponse
from sqlalchemy import func, select
from sqlalchemy.ext.asyncio import AsyncSession

from guarddog_nexus.database import get_session
from guarddog_nexus.models import Finding, Scan

router = APIRouter(tags=["web"])
TEMPLATES: dict[str, str] = {}


def _render(name: str, **context) -> HTMLResponse:
    from jinja2 import Environment, PackageLoader, select_autoescape

    env = Environment(
        loader=PackageLoader("guarddog_nexus", "web/templates"),
        autoescape=select_autoescape(),
    )
    template = env.get_template(name)
    return HTMLResponse(template.render(**context))


@router.get("/", response_class=HTMLResponse)
async def dashboard(request: Request, session: AsyncSession = Depends(get_session)):
    total_scans = await session.scalar(select(func.count(Scan.id)))
    flagged_scans = await session.scalar(select(func.count(Scan.id)).where(Scan.flagged == True))
    recent_flagged = await session.scalar(
        select(func.count(Scan.id)).where(
            Scan.flagged == True,
            Scan.started_at >= func.datetime("now", "-7 days"),
        )
    )
    total_findings = await session.scalar(select(func.count(Finding.id)))
    latest_scans = (
        (await session.execute(select(Scan).order_by(Scan.started_at.desc()).limit(10)))
        .scalars()
        .all()
    )

    top_rules = (
        await session.execute(
            select(Finding.rule, func.count(Finding.id).label("cnt"))
            .group_by(Finding.rule)
            .order_by(func.count(Finding.id).desc())
            .limit(10)
        )
    ).all()

    return _render(
        "dashboard.html",
        total_scans=total_scans,
        flagged_scans=flagged_scans,
        recent_flagged=recent_flagged,
        total_findings=total_findings,
        latest_scans=latest_scans,
        top_rules=[(r.rule, r.cnt) for r in top_rules],
        now=datetime.datetime.now(datetime.timezone.utc),
        request=request,
    )


@router.get("/scans", response_class=HTMLResponse)
async def scans_list(
    request: Request,
    page: int = 1,
    flagged: str = "",
    session: AsyncSession = Depends(get_session),
):
    per_page = 50
    offset = (page - 1) * per_page

    q = select(Scan)
    if flagged == "1":
        q = q.where(Scan.flagged == True)
    q = q.order_by(Scan.started_at.desc()).offset(offset).limit(per_page)

    scans = (await session.execute(q)).scalars().all()
    total = await session.scalar(select(func.count(Scan.id)))

    return _render(
        "scans_list.html",
        scans=scans,
        page=page,
        per_page=per_page,
        total=total,
        flagged_filter=flagged,
        request=request,
    )


@router.get("/scans/{scan_id}", response_class=HTMLResponse)
async def scan_detail(scan_id: int, request: Request, session: AsyncSession = Depends(get_session)):
    from sqlalchemy.orm import selectinload

    scan = await session.scalar(
        select(Scan).where(Scan.id == scan_id).options(selectinload(Scan.findings))
    )
    if not scan:
        return HTMLResponse("<h1>Not found</h1>", status_code=404)

    return _render("scan_detail.html", scan=scan, request=request)


@router.get("/packages", response_class=HTMLResponse)
async def packages_list(
    request: Request,
    page: int = 1,
    flagged: str = "",
    session: AsyncSession = Depends(get_session),
):
    per_page = 50
    offset = (page - 1) * per_page

    subq = select(
        Scan.package_name.label("pkg_name"),
        Scan.package_version.label("pkg_ver"),
        Scan.ecosystem,
        Scan.repository,
        func.max(Scan.started_at).label("last_scan"),
        func.max(Scan.flagged).label("is_flagged"),
        func.sum(Scan.total_findings).label("findings_sum"),
        func.max(Scan.id).label("sid"),
    ).group_by(Scan.package_name, Scan.package_version)

    if flagged == "1":
        subq = subq.having(func.max(Scan.flagged) == True)

    subq = subq.subquery()
    total = await session.scalar(select(func.count()).select_from(subq))
    rows = (
        await session.execute(
            select(subq).order_by(subq.c.last_scan.desc()).offset(offset).limit(per_page)
        )
    ).all()

    return _render(
        "packages_list.html",
        packages=rows,
        page=page,
        per_page=per_page,
        total=total,
        flagged_filter=flagged,
        request=request,
    )


@router.get("/packages/{name}/{version}", response_class=HTMLResponse)
async def package_detail(
    name: str,
    version: str,
    request: Request,
    session: AsyncSession = Depends(get_session),
):
    from sqlalchemy.orm import selectinload

    scans = (
        (
            await session.execute(
                select(Scan)
                .where(Scan.package_name == name, Scan.package_version == version)
                .options(selectinload(Scan.findings))
                .order_by(Scan.started_at.desc())
            )
        )
        .scalars()
        .all()
    )

    if not scans:
        return HTMLResponse("<h1>Not found</h1>", status_code=404)

    all_findings = []
    for s in scans:
        all_findings.extend(s.findings)

    return _render(
        "package_detail.html",
        pkg_name=name,
        pkg_version=version,
        scans=scans,
        findings=all_findings,
        request=request,
    )