# plugins/docker/routes.py
from __future__ import annotations
import json
from quart import Blueprint, current_app, render_template, request
from sqlalchemy import Integer, cast, func, select

from steward.auth.middleware import require_role
from steward.models.users import UserRole
from steward.core.time_range import parse_range, DEFAULT_RANGE, bucket_seconds
from .models import DockerContainer, DockerMetric

docker_bp = Blueprint("docker", __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>'
    )


@docker_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(
        "docker/index.html",
        poll_interval=poll_interval,
        current_range=current_range,
    )


@docker_bp.get("/rows")
@require_role(UserRole.viewer)
async def rows():
    """HTMX fragment: container list with status and resource sparklines."""
    since, range_key = parse_range(request.args.get("range"))
    b_secs = bucket_seconds(since)

    bucket_col = (
        cast(func.strftime('%s', DockerMetric.scraped_at), Integer) / b_secs
    ).label("bucket")

    async with current_app.db_sessionmaker() as db:
        # All known containers ordered by running first, then name
        result = await db.execute(
            select(DockerContainer)
            .order_by(
                # running first
                (DockerContainer.status == "running").desc(),
                DockerContainer.name,
            )
        )
        containers = list(result.scalars())

        # Build per-container sparkline histories
        histories: dict[str, list] = {}
        for c in containers:
            result = await db.execute(
                select(
                    func.avg(DockerMetric.cpu_pct).label("cpu_pct"),
                    func.avg(DockerMetric.mem_pct).label("mem_pct"),
                    bucket_col,
                )
                .where(DockerMetric.container_name == c.name)
                .where(DockerMetric.scraped_at >= since)
                .group_by(bucket_col)
                .order_by(bucket_col)
            )
            histories[c.name] = result.all()

    running = sum(1 for c in containers if c.status == "running")
    stopped = len(containers) - running

    container_data = []
    for c in containers:
        hist = histories.get(c.name, [])
        ports = json.loads(c.ports_json) if c.ports_json else []
        container_data.append({
            "container": c,
            "ports": ports,
            "sparkline_cpu": _sparkline([r.cpu_pct or 0 for r in hist]),
            "sparkline_mem": _sparkline([r.mem_pct or 0 for r in hist]),
        })

    return await render_template(
        "docker/rows.html",
        container_data=container_data,
        running=running,
        stopped=stopped,
        range_key=range_key,
    )


@docker_bp.get("/widget")
@require_role(UserRole.viewer)
async def widget():
    """HTMX dashboard widget: container status overview."""
    show_stopped = request.args.get("show_stopped", "no") == "yes"
    widget_id = request.args.get("wid", "0")

    async with current_app.db_sessionmaker() as db:
        result = await db.execute(
            select(DockerContainer)
            .order_by(
                (DockerContainer.status == "running").desc(),
                DockerContainer.name,
            )
        )
        all_containers = list(result.scalars())

    running = [c for c in all_containers if c.status == "running"]
    stopped = [c for c in all_containers if c.status != "running"]
    display = all_containers if show_stopped else running

    return await render_template(
        "docker/widget.html",
        containers=display,
        running_count=len(running),
        stopped_count=len(stopped),
        show_stopped=show_stopped,
        widget_id=widget_id,
    )


@docker_bp.get("/widget/resources")
@require_role(UserRole.viewer)
async def widget_resources():
    """HTMX dashboard widget: CPU + memory usage for running containers."""
    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(DockerContainer)
            .where(DockerContainer.status == "running")
            .order_by(DockerContainer.cpu_pct.desc().nullslast())
        )
        containers = list(result.scalars())[:limit]

    return await render_template(
        "docker/widget_resources.html",
        containers=containers,
        widget_id=widget_id,
    )