"""HTML page routes — server-rendered Jinja2 with HTMX-driven partial refresh."""
from __future__ import annotations

from datetime import date, datetime, timezone

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

from app.auth import CurrentUser, require_auth, require_token
from app.config import get_settings, load_groups
from app.db import get_session
from app.models import Referral, StrategicLog, User
from app.services.access import paid_status
from app.services.referral_service import assign_code_if_missing
from app.templates_env import templates

router = APIRouter(dependencies=[Depends(require_token)])


@router.get("/", response_class=HTMLResponse)
async def dashboard(request: Request):
    s = get_settings()
    groups = load_groups(s.BASELINE_TOML, s.PORTFOLIO_TOML)
    return templates.TemplateResponse(
        request,
        "dashboard.html",
        {"groups": list(groups.keys()), "anchor": s.CASSANDRA_ANCHOR_DATE},
    )


@router.get("/news", response_class=HTMLResponse)
async def news_page(request: Request):
    return templates.TemplateResponse(request, "news.html", {})


@router.get("/upload", response_class=HTMLResponse)
async def upload_page(request: Request):
    """Drag-drop CSV import. Posts to /api/portfolios/upload."""
    return templates.TemplateResponse(request, "upload.html", {})


async def _resolve_log_date(session: AsyncSession, day: str | None) -> date:
    """If `day` is YYYY-MM-DD use it; else fall back to the date of the most
    recent generated log; else today."""
    if day:
        try:
            return datetime.strptime(day, "%Y-%m-%d").date()
        except ValueError:
            pass
    latest = (await session.execute(
        select(StrategicLog.generated_at)
        .order_by(desc(StrategicLog.generated_at))
        .limit(1)
    )).scalar_one_or_none()
    if latest is not None:
        return latest.date() if hasattr(latest, "date") else latest
    return datetime.now(timezone.utc).date()


def _log_page_context(target: date) -> dict:
    s = get_settings()
    return {
        "selected_iso": target.isoformat(),
        "selected_month": target.strftime("%Y-%m"),
        "current_tone": s.CASSANDRA_TONE.upper(),
        "current_analysis": s.CASSANDRA_ANALYSIS.upper(),
    }


@router.get("/log", response_class=HTMLResponse)
async def log_page(
    request: Request,
    session: AsyncSession = Depends(get_session),
):
    target = await _resolve_log_date(session, None)
    return templates.TemplateResponse(request, "log.html", _log_page_context(target))


@router.get("/log/{day}", response_class=HTMLResponse)
async def log_page_day(
    request: Request,
    day: str,
    session: AsyncSession = Depends(get_session),
):
    target = await _resolve_log_date(session, day)
    return templates.TemplateResponse(request, "log.html", _log_page_context(target))


@router.get("/settings", response_class=HTMLResponse)
async def settings_page(
    request: Request,
    session: AsyncSession = Depends(get_session),
    principal: CurrentUser = Depends(require_auth),
):
    """Per-user settings. Currently shows email, tier, and the referral
    block (own code + invite link + counts of pending/converted
    referrals). The Credit / Paddle pieces land in D.3."""
    user = principal.user
    if user is None:
        # Bearer-token admin path — no per-user settings to show.
        return templates.TemplateResponse(
            request, "settings.html",
            {"user": None, "invite_url": None,
             "pending_count": 0, "converted_count": 0},
        )

    # Lazily assign a referral code on first visit.
    user = await assign_code_if_missing(session, user)

    # Stats: how many people have signed up with their code so far, and
    # how many of those converted (paid). D.3 will fill `converted_at`.
    pending_count = (await session.execute(
        select(func.count(Referral.id))
        .where(Referral.referrer_user_id == user.id)
        .where(Referral.converted_at.is_(None))
    )).scalar() or 0
    converted_count = (await session.execute(
        select(func.count(Referral.id))
        .where(Referral.referrer_user_id == user.id)
        .where(Referral.converted_at.is_not(None))
    )).scalar() or 0

    invite_url = str(request.url_for("login_page")) + f"?ref={user.referral_code}"

    return templates.TemplateResponse(
        request, "settings.html",
        {
            "user": user,
            "invite_url": invite_url,
            "pending_count": int(pending_count),
            "converted_count": int(converted_count),
            "paid": paid_status(user),
        },
    )