"""Entry point: `cuda-grid-controller --config controller.yaml`."""

from __future__ import annotations

import asyncio
import logging
import sys
from pathlib import Path

import structlog
import typer
import uvicorn

from .config import Config
from .dispatch import CommandDispatcher
from .browser_overlays import BrowserRenderer, DashboardCfg
from .dynamic_overlays import ChartCfg, ChatCfg, DynamicRenderer
from .pipeline_monitor import PipelineMonitor
from .placeholder_renderer import generate_placeholders
from .frigate_bridge import FrigateBridge, FrigateBridgeCfg
from .http_api import create_app
from .mqtt_loop import MqttLoop
from .snapshot_history import SnapshotHistory
from .snapshot_keeper import SnapshotKeeper
from .state import ControllerState
from .watchdog import StreamWatchdog, WatchdogCfg

cli = typer.Typer(add_completion=False)


def _configure_logging(level: str) -> None:
    logging.basicConfig(
        format="%(message)s",
        level=getattr(logging, level.upper(), logging.INFO),
    )
    structlog.configure(
        processors=[
            structlog.processors.add_log_level,
            structlog.processors.TimeStamper(fmt="iso"),
            structlog.dev.ConsoleRenderer(),
        ]
    )


async def _run(cfg: Config) -> None:
    state = ControllerState()
    # Init active_layout = default_layout per instance
    for inst in cfg.instances:
        await state.set_layout(inst.name, inst.default_layout)

    dispatcher = CommandDispatcher(cfg, state)

    # Frigate bridge (опционально) — передаём dispatcher для auto-overlay generation
    frigate_bridge: FrigateBridge | None = None
    if cfg.frigate:
        try:
            fcfg = FrigateBridgeCfg.model_validate(cfg.frigate)
            if fcfg.enabled:
                frigate_bridge = FrigateBridge(fcfg, dispatcher=dispatcher)
                # Generate per-cell placeholder PNGs based на mappings — filter
                # blits offline_<cell>.png когда input pad stale. Empty
                # placeholder_label → fallback к frigate_camera name.
                labels = {
                    m.cell: (m.placeholder_label or m.frigate_camera)
                    for m in fcfg.mappings if m.enabled
                }
                if labels:
                    try:
                        generate_placeholders(Path(cfg.icon_dir), labels)
                    except Exception as e:
                        structlog.get_logger().warning(
                            "placeholders.gen_fail", error=str(e))
        except Exception as e:
            structlog.get_logger().warning(
                "frigate_bridge.config_invalid", error=str(e)
            )

    # Dynamic overlays (charts/chats) — Phase 6
    dynamic_renderer: DynamicRenderer | None = None
    browser_renderer: BrowserRenderer | None = None
    if cfg.dynamic_overlays:
        try:
            d = cfg.dynamic_overlays
            charts = [ChartCfg.model_validate(c) for c in (d.get("charts") or [])]
            chats = [ChatCfg.model_validate(c) for c in (d.get("chats") or [])]
            if charts or chats:
                dynamic_renderer = DynamicRenderer(
                    icon_dir=Path(cfg.icon_dir),
                    dispatcher=dispatcher,
                    charts=charts,
                    chats=chats,
                )
            dashboards = [DashboardCfg.model_validate(b)
                          for b in (d.get("dashboards") or [])]
            if dashboards:
                browser_renderer = BrowserRenderer(
                    icon_dir=Path(cfg.icon_dir),
                    dispatcher=dispatcher,
                    dashboards=dashboards,
                )
        except Exception as e:
            structlog.get_logger().warning("dynamic_overlays.config_invalid", error=str(e))

    mqtt = MqttLoop(cfg, state, dispatcher.handle,
                    frigate_bridge=frigate_bridge,
                    dynamic_renderer=dynamic_renderer)

    # Wire dispatcher events → MQTT publishes
    dispatcher.on_state_change = mqtt.publish_state
    dispatcher.on_event = mqtt.publish_event

    # Snapshot history (Phase 6+) — periodic capture per instance
    snapshot_hist = SnapshotHistory(cfg)

    # Snapshot keeper — persistent ffmpeg per instance dumping latest frame
    # к PNG (для low-latency /snapshot UI polling).
    snapshot_keeper = SnapshotKeeper(cfg, Path("/tmp/snapshot-keeper"))

    # Stream watchdog (Phase 1 resilience, issue #3) — monitor mediamtx paths
    watchdog: StreamWatchdog | None = None
    if cfg.watchdog:
        try:
            wcfg = WatchdogCfg.model_validate(cfg.watchdog)
            if wcfg.enabled:
                watchdog = StreamWatchdog(wcfg, dispatcher,
                                           mqtt_publish_event=None)  # set after mqtt
        except Exception as e:
            structlog.get_logger().warning("watchdog.config_invalid", error=str(e))

    # HTTP REST
    app = create_app(cfg, state, dispatcher,
                     snapshot_history=snapshot_hist,
                     snapshot_keeper=snapshot_keeper,
                     frigate_bridge=frigate_bridge)
    server = uvicorn.Server(
        uvicorn.Config(
            app,
            host=cfg.http.host,
            port=cfg.http.port,
            log_level=cfg.log.level.lower(),
        )
    )

    log = structlog.get_logger()
    log.info(
        "controller.starting",
        instances=[i.name for i in cfg.instances],
        mqtt=f"{cfg.broker.host}:{cfg.broker.port}",
        http=f"{cfg.http.host}:{cfg.http.port}",
    )

    # Start dynamic renderer задачи (если есть)
    if dynamic_renderer:
        await dynamic_renderer.start()
    if browser_renderer:
        await browser_renderer.start()
    await snapshot_hist.start()
    await snapshot_keeper.start()
    if watchdog:
        watchdog._publish_event = mqtt.publish_event
        await watchdog.start()

    # Pipeline monitor — detect ffmpeg restart + auto-restore overlay state +
    # encoder stall alerts (через MQTT pipeline.stalled event).
    pipeline_monitor = PipelineMonitor(
        cfg=cfg, state=state, dispatcher=dispatcher,
        browser_renderer=browser_renderer,
        dynamic_renderer=dynamic_renderer,
        frigate_bridge=frigate_bridge,
    )
    pipeline_monitor.on_event = mqtt.publish_event
    await pipeline_monitor.start()

    try:
        await asyncio.gather(
            mqtt.run(),
            server.serve(),
        )
    except asyncio.CancelledError:
        log.info("controller.shutdown")
    finally:
        await pipeline_monitor.stop()
        if dynamic_renderer:
            await dynamic_renderer.stop()
        if browser_renderer:
            await browser_renderer.stop()
        await snapshot_hist.stop()
        await snapshot_keeper.stop()
        if watchdog:
            await watchdog.stop()
        await dispatcher.close()
        await mqtt.stop()


@cli.command()
def run(
    config: Path = typer.Option(
        Path("controller.yaml"),
        "--config",
        "-c",
        help="YAML config path",
    ),
) -> None:
    """Запустить controller."""
    if not config.exists():
        typer.echo(f"config not found: {config}", err=True)
        raise typer.Exit(1)
    cfg = Config.from_yaml(config)
    _configure_logging(cfg.log.level)
    asyncio.run(_run(cfg))


def main() -> None:
    cli()


if __name__ == "__main__":
    main()