"""
pyserve top - Live monitoring dashboard
"""

import asyncio
import time
from pathlib import Path
from typing import Optional

import click


@click.command("top")
@click.argument("services", nargs=-1)
@click.option(
    "--refresh",
    "refresh_interval",
    default=2,
    type=float,
    help="Refresh interval in seconds",
)
@click.option(
    "--no-color",
    is_flag=True,
    help="Disable colored output",
)
@click.pass_obj
def top_cmd(ctx, services: tuple, refresh_interval: float, no_color: bool):
    """
    Live monitoring dashboard for services.

    Shows real-time CPU, memory usage, and request metrics.

    \b
    Examples:
      pyserve top                   # Monitor all services
      pyserve top api admin         # Monitor specific services
      pyserve top --refresh 5       # Slower refresh rate
    """
    from ..output import console, print_info
    from ..state import StateManager

    state_manager = StateManager(Path(".pyserve"), ctx.project)

    if not state_manager.is_daemon_running():
        print_info("No services running. Start with 'pyserve up -d'")
        return

    try:
        asyncio.run(
            _run_dashboard(
                state_manager,
                list(services) if services else None,
                refresh_interval,
                no_color,
            )
        )
    except KeyboardInterrupt:
        console.print("\n")


async def _run_dashboard(
    state_manager,
    filter_services: Optional[list],
    refresh_interval: float,
    no_color: bool,
):
    from rich.live import Live
    from rich.table import Table
    from rich.panel import Panel
    from rich.layout import Layout
    from rich.text import Text
    from ..output import console, format_uptime, format_bytes

    try:
        import psutil
    except ImportError:
        console.print("[yellow]psutil not installed. Install with: pip install psutil[/yellow]")
        return

    start_time = time.time()

    def make_dashboard():
        all_services = state_manager.get_all_services()

        if filter_services:
            all_services = {k: v for k, v in all_services.items() if k in filter_services}

        table = Table(
            title=None,
            show_header=True,
            header_style="bold",
            border_style="dim",
            expand=True,
        )
        table.add_column("SERVICE", style="cyan", no_wrap=True)
        table.add_column("STATUS", no_wrap=True)
        table.add_column("CPU%", justify="right")
        table.add_column("MEM", justify="right")
        table.add_column("PID", style="dim")
        table.add_column("UPTIME", style="dim")
        table.add_column("HEALTH", no_wrap=True)

        total_cpu = 0.0
        total_mem = 0
        running_count = 0
        total_count = len(all_services)

        for name, service in sorted(all_services.items()):
            status_style = {
                "running": "[green]● RUN[/green]",
                "stopped": "[dim]○ STOP[/dim]",
                "failed": "[red]✗ FAIL[/red]",
                "starting": "[yellow]◐ START[/yellow]",
                "stopping": "[yellow]◑ STOP[/yellow]",
            }.get(service.state, service.state)

            cpu_str = "-"
            mem_str = "-"

            if service.pid and service.state == "running":
                try:
                    proc = psutil.Process(service.pid)
                    cpu = proc.cpu_percent(interval=0.1)
                    mem = proc.memory_info().rss
                    cpu_str = f"{cpu:.1f}%"
                    mem_str = format_bytes(mem)
                    total_cpu += cpu
                    total_mem += mem
                    running_count += 1
                except (psutil.NoSuchProcess, psutil.AccessDenied):
                    pass

            health_style = {
                "healthy": "[green]✓[/green]",
                "unhealthy": "[red]✗[/red]",
                "degraded": "[yellow]⚠[/yellow]",
                "unknown": "[dim]?[/dim]",
            }.get(service.health.status, "[dim]-[/dim]")

            uptime = format_uptime(service.uptime) if service.state == "running" else "-"
            pid = str(service.pid) if service.pid else "-"

            table.add_row(
                name,
                status_style,
                cpu_str,
                mem_str,
                pid,
                uptime,
                health_style,
            )

        elapsed = format_uptime(time.time() - start_time)
        summary = Text()
        summary.append(f"Running: {running_count}/{total_count}", style="bold")
        summary.append(" | ")
        summary.append(f"CPU: {total_cpu:.1f}%", style="cyan")
        summary.append(" | ")
        summary.append(f"MEM: {format_bytes(total_mem)}", style="cyan")
        summary.append(" | ")
        summary.append(f"Session: {elapsed}", style="dim")

        layout = Layout()
        layout.split_column(
            Layout(
                Panel(
                    Text("PyServe Dashboard", style="bold cyan", justify="center"),
                    border_style="cyan",
                ),
                size=3,
            ),
            Layout(table),
            Layout(Panel(summary, border_style="dim"), size=3),
        )

        return layout

    with Live(make_dashboard(), refresh_per_second=1 / refresh_interval, console=console) as live:
        while True:
            await asyncio.sleep(refresh_interval)
            live.update(make_dashboard())