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

from urllib.parse import unquote

from fastapi import APIRouter, Depends, Request
from fastapi.responses import HTMLResponse
from jinja2 import Environment, PackageLoader, select_autoescape
from sqlalchemy import select
from sqlalchemy.ext.asyncio import AsyncSession

from guarddog_nexus.constants import (
    APP_PACKAGE,
    DEFAULT_SORT_BY_PACKAGES,
    DEFAULT_SORT_BY_SCANS,
    DEFAULT_SORT_DIR,
    WEB_PER_PAGE,
)
from guarddog_nexus.database import get_session
from guarddog_nexus.models import Finding, Scan
from guarddog_nexus.queries import (
    build_package_list_query,
    build_scan_list_query,
    get_dashboard_stats,
)

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

_jinja_env = Environment(
    loader=PackageLoader(APP_PACKAGE, "web/templates"),
    autoescape=select_autoescape(),
)


def _render(name: str, **context) -> HTMLResponse:
    template = _jinja_env.get_template(name)
    return HTMLResponse(template.render(**context))


@router.get("/", response_class=HTMLResponse)
async def dashboard(request: Request, session: AsyncSession = Depends(get_session)):
    ctx = await get_dashboard_stats(session)
    return _render("dashboard.html", **ctx, request=request)


@router.get("/dashboard/stats", response_class=HTMLResponse)
async def dashboard_stats_fragment(session: AsyncSession = Depends(get_session)):
    ctx = await get_dashboard_stats(session)
    return _render("dashboard_stats.html", **ctx)


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

    flagged_bool = None
    if flagged == "1":
        flagged_bool = True

    q, count_q = build_scan_list_query(
        flagged=flagged_bool,
        status=status or None,
        search=search or None,
        sort_by=sort_by,
        sort_dir=sort_dir,
        limit=per_page,
        offset=offset,
    )
    scans = (await session.execute(q)).scalars().all()
    total = await session.scalar(count_q)

    template = "_scans_table.html" if request.headers.get("HX-Request") else "scans_list.html"

    return _render(
        template,
        scans=scans,
        page=page,
        per_page=per_page,
        total=total,
        flagged_filter=flagged,
        search=search,
        status_filter=status,
        sort_by=sort_by,
        sort_dir=sort_dir,
        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 = "",
    search: str = "",
    sort_by: str = DEFAULT_SORT_BY_PACKAGES,
    sort_dir: str = DEFAULT_SORT_DIR,
    session: AsyncSession = Depends(get_session),
):
    per_page = WEB_PER_PAGE
    offset = (page - 1) * per_page

    flagged_bool = None
    if flagged == "1":
        flagged_bool = True

    rows_q, total_q = build_package_list_query(
        flagged=flagged_bool,
        search=search or None,
        sort_by=sort_by,
        sort_dir=sort_dir,
        limit=per_page,
        offset=offset,
    )
    total = await session.scalar(total_q)
    rows = (await session.execute(rows_q)).all()

    template = "_packages_table.html" if request.headers.get("HX-Request") else "packages_list.html"

    return _render(
        template,
        packages=rows,
        page=page,
        per_page=per_page,
        total=total,
        flagged_filter=flagged,
        search=search,
        sort_by=sort_by,
        sort_dir=sort_dir,
        request=request,
    )


@router.get("/packages/{name:path}", response_class=HTMLResponse)
async def package_detail(
    name: str,
    request: Request,
    session: AsyncSession = Depends(get_session),
):
    # name:path captures the entire path after /packages/
    # e.g. "eviltest/0.1.0" or "github.com/attacker/evilmodule/v0.1.0"
    parts = name.rsplit("/", 1)
    pkg_name = unquote(parts[0])
    pkg_version = unquote(parts[1]) if len(parts) == 2 else ""

    from sqlalchemy.orm import selectinload

    scans = (
        (
            await session.execute(
                select(Scan)
                .where(Scan.package_name == pkg_name, Scan.package_version == pkg_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=pkg_name,
        pkg_version=pkg_version,
        scans=scans,
        findings=all_findings,
        request=request,
    )


@router.post("/api/v1/findings/{finding_id}/analyze", response_class=HTMLResponse)
async def analyze_finding_htmx(
    finding_id: int,
    session: AsyncSession = Depends(get_session),
):
    """HTMX fragment: trigger LLM analysis and return styled result HTML."""
    from guarddog_nexus.config import config
    from guarddog_nexus.llm import analyze_finding

    if not config.llm_enabled:
        return HTMLResponse(
            '<div class="llm-actions"><small class="flagged">LLM analysis is disabled</small></div>'
        )

    finding = await session.scalar(select(Finding).where(Finding.id == finding_id))
    if not finding:
        return HTMLResponse(
            '<div class="llm-actions"><small class="flagged">Finding not found</small></div>',
            status_code=404,
        )

    report = await analyze_finding(finding.data)
    if report is None:
        return HTMLResponse(
            '<div class="llm-actions"><small class="flagged">LLM analysis failed</small></div>'
        )

    finding.report = report
    await session.commit()

    return _render("_llm_report_fragment.html", report=report)