# plugins/http/routes.py
from __future__ import annotations
import json
import uuid
from datetime import datetime, timezone
from quart import Blueprint, current_app, render_template, request, redirect, url_for
from sqlalchemy import Integer, cast, func, select

from fabledscryer.auth.middleware import require_role
from fabledscryer.models.users import UserRole
from fabledscryer.core.time_range import parse_range, DEFAULT_RANGE, bucket_seconds
from .models import HttpMonitor, HttpResult

http_bp = Blueprint("http", __name__, template_folder="templates")


def _sparkline(values: list[float], width: int = 80, height: int = 20) -> str:
    if len(values) < 2:
        return f'<svg width="{width}" height="{height}"></svg>'
    mn, mx = min(values), max(values)
    if mx == mn:
        mx = mn + 1.0
    step = width / (len(values) - 1)
    pts = []
    for i, v in enumerate(values):
        x = i * step
        y = height - (v - mn) / (mx - mn) * (height - 2) - 1
        pts.append(f"{x:.1f},{y:.1f}")
    poly = " ".join(pts)
    return (
        f'<svg width="{width}" height="{height}" viewBox="0 0 {width} {height}" '
        f'style="vertical-align:middle;">'
        f'<polyline points="{poly}" fill="none" stroke="#6060c0" stroke-width="1.5"/>'
        f'</svg>'
    )


async def _render_rows(range_key: str = DEFAULT_RANGE):
    since, range_key = parse_range(range_key)
    b_secs = bucket_seconds(since)
    bucket_col = (
        cast(func.extract('epoch', HttpResult.checked_at), Integer) / b_secs
    ).label("bucket")

    async with current_app.db_sessionmaker() as db:
        result = await db.execute(
            select(HttpMonitor).order_by(HttpMonitor.created_at)
        )
        monitors = list(result.scalars())

        # Latest result per monitor
        latest_map: dict[str, HttpResult] = {}
        histories: dict[str, list] = {}
        for m in monitors:
            r = await db.execute(
                select(HttpResult)
                .where(HttpResult.monitor_id == m.id)
                .order_by(HttpResult.checked_at.desc())
                .limit(1)
            )
            latest = r.scalar_one_or_none()
            if latest:
                latest_map[m.id] = latest

            r2 = await db.execute(
                select(
                    func.avg(HttpResult.response_ms).label("response_ms"),
                    func.min(HttpResult.is_up.cast(Integer)).label("had_down"),
                    bucket_col,
                )
                .where(HttpResult.monitor_id == m.id)
                .where(HttpResult.checked_at >= since)
                .group_by(bucket_col)
                .order_by(bucket_col)
            )
            histories[m.id] = r2.all()

    monitor_data = []
    for m in monitors:
        hist = histories.get(m.id, [])
        latest = latest_map.get(m.id)
        now = datetime.now(timezone.utc)
        tls_days = None
        if latest and latest.tls_expires_at:
            tls_days = (latest.tls_expires_at - now).total_seconds() / 86400.0
        monitor_data.append({
            "monitor": m,
            "latest": latest,
            "tls_days": tls_days,
            "sparkline_ms": _sparkline([r.response_ms or 0 for r in hist]),
        })

    up = sum(1 for d in monitor_data if d["latest"] and d["latest"].is_up)
    down = sum(1 for d in monitor_data if d["latest"] and not d["latest"].is_up)
    return monitor_data, up, down, range_key


@http_bp.get("/")
@require_role(UserRole.viewer)
async def index():
    poll_interval = current_app.config.get("MONITORS_POLL_INTERVAL", 60)
    current_range = request.args.get("range", DEFAULT_RANGE)
    return await render_template(
        "http/index.html",
        poll_interval=poll_interval,
        current_range=current_range,
    )


@http_bp.get("/rows")
@require_role(UserRole.viewer)
async def rows():
    """HTMX fragment: monitor list with status + sparklines."""
    monitor_data, up, down, range_key = await _render_rows(
        request.args.get("range", DEFAULT_RANGE)
    )
    return await render_template(
        "http/rows.html",
        monitor_data=monitor_data,
        up=up,
        down=down,
        range_key=range_key,
    )


@http_bp.post("/add")
@require_role(UserRole.operator)
async def add_monitor():
    """Add a new HTTP monitor."""
    form = await request.form
    url = form.get("url", "").strip()
    if not url:
        return redirect(url_for("http.index"))
    if not url.startswith(("http://", "https://")):
        url = "https://" + url

    monitor = HttpMonitor(
        id=str(uuid.uuid4()),
        name=form.get("name", "").strip() or url,
        url=url,
        method=form.get("method", "GET").upper(),
        expected_status=int(form.get("expected_status", 200) or 200),
        content_match=form.get("content_match", "").strip(),
        headers_json="{}",
        timeout_seconds=int(form.get("timeout_seconds", 10) or 10),
        check_interval_seconds=int(form.get("check_interval_seconds", 0) or 0),
        follow_redirects="follow_redirects" in form,
        verify_ssl="verify_ssl" in form,
        enabled=True,
        created_at=datetime.now(timezone.utc),
    )
    async with current_app.db_sessionmaker() as db:
        async with db.begin():
            db.add(monitor)

    return redirect(url_for("http.index"))


@http_bp.post("/<monitor_id>/delete")
@require_role(UserRole.operator)
async def delete_monitor(monitor_id: str):
    async with current_app.db_sessionmaker() as db:
        async with db.begin():
            m = await db.get(HttpMonitor, monitor_id)
            if m:
                await db.delete(m)
    return redirect(url_for("http.index"))


@http_bp.post("/<monitor_id>/toggle")
@require_role(UserRole.operator)
async def toggle_monitor(monitor_id: str):
    async with current_app.db_sessionmaker() as db:
        async with db.begin():
            m = await db.get(HttpMonitor, monitor_id)
            if m:
                m.enabled = not m.enabled
    return redirect(url_for("http.index"))


@http_bp.get("/widget")
@require_role(UserRole.viewer)
async def widget():
    """HTMX dashboard widget: up/down counts + monitor list."""
    show_down_only = request.args.get("show_down_only", "no") == "yes"
    limit = max(1, min(20, int(request.args.get("limit", 10) or 10)))
    widget_id = request.args.get("wid", "0")

    async with current_app.db_sessionmaker() as db:
        result = await db.execute(
            select(HttpMonitor)
            .where(HttpMonitor.enabled == True)  # noqa: E712
            .order_by(HttpMonitor.created_at)
        )
        monitors = list(result.scalars())

        latest_map: dict[str, HttpResult] = {}
        for m in monitors:
            r = await db.execute(
                select(HttpResult)
                .where(HttpResult.monitor_id == m.id)
                .order_by(HttpResult.checked_at.desc())
                .limit(1)
            )
            latest = r.scalar_one_or_none()
            if latest:
                latest_map[m.id] = latest

    monitor_data = [
        {"monitor": m, "latest": latest_map.get(m.id)}
        for m in monitors
    ]

    up = sum(1 for d in monitor_data if d["latest"] and d["latest"].is_up)
    down = sum(1 for d in monitor_data if d["latest"] and not d["latest"].is_up)
    pending = sum(1 for d in monitor_data if not d["latest"])

    if show_down_only:
        monitor_data = [d for d in monitor_data if not (d["latest"] and d["latest"].is_up)]

    return await render_template(
        "http/widget.html",
        monitor_data=monitor_data[:limit],
        up=up,
        down=down,
        pending=pending,
        show_down_only=show_down_only,
        widget_id=widget_id,
    )