"""Terminal TUI for device status monitoring."""

import os
import sys
import threading
import time

from devices import status_all, is_curfew_allowed


# ANSI escape codes
CLEAR = "\033[2J\033[H"
BOLD = "\033[1m"
RESET = "\033[0m"
GREEN = "\033[92m"
RED = "\033[91m"
YELLOW = "\033[93m"
CYAN = "\033[96m"
GRAY = "\033[90m"


def _get_terminal_size():
    """Get terminal width and height."""
    try:
        return os.get_terminal_size()
    except OSError:
        return (80, 24)


def _color(text: str, color_code: str) -> str:
    """Wrap text in ANSI color code."""
    return f"{color_code}{text}{RESET}"


def _separator(width: int = 60) -> str:
    """Create a separator line."""
    return "─" * width


def render(devices_status, curfew, refresh_interval: int = 10):
    """Render the TUI screen."""
    width, height = _get_terminal_size()
    lines = []

    # Header
    lines.append(_color("⚡ KIDS DEVICES — STATUS", BOLD))
    lines.append("")

    # Curfew status
    if curfew["in_curfew"]:
        curfew_icon = _color("🔴 BLOCKED", RED)
    else:
        curfew_icon = _color("🟢 ALLOWED", GREEN)
    lines.append(f"  Curfew: {curfew_icon}  |  {curfew['message']}")
    lines.append("")

    # Device list
    for device in devices_status:
        icon = device["icon"]
        name = device["title"]
        detail = device["detail"]

        # Parse budget from detail
        parts = detail.split(" · ")
        status_text = parts[0] if parts else "Unknown"
        budget_text = parts[1] if len(parts) > 1 else ""

        # Color the status
        if "Online" in status_text:
            status_color = GREEN
        elif "Offline" in status_text:
            status_color = GRAY
        else:
            status_color = YELLOW

        status_colored = _color(status_text, status_color)

        # Color the budget
        if "🔴" in device["icon"]:
            budget_color = RED
        elif "🟠" in device["icon"]:
            budget_color = YELLOW
        else:
            budget_color = CYAN

        budget_colored = _color(budget_text, budget_color) if budget_text else ""

        lines.append(f"  {icon} {name:<12} {status_colored}  ·  {budget_colored}")

    # Footer with timestamp
    now = time.strftime("%H:%M:%S")
    lines.append(f"  {_color('Last update:', GRAY)} {now}  |  Refresh: {refresh_interval}s")

    return "\n".join(lines)


def run_tui(refresh_interval: int = 10):
    """Run the TUI in a loop."""
    # Run in a separate thread to not block the server
    while True:
        try:
            devices_status, curfew = status_all()
            screen = render(devices_status, curfew, refresh_interval)
            sys.stdout.write(CLEAR + screen)
            sys.stdout.flush()
        except Exception:
            pass  # Don't crash TUI on errors

        time.sleep(refresh_interval)


def start_tui(refresh_interval: int = 10):
    """Start the TUI in a background thread."""
    tui_thread = threading.Thread(
        target=run_tui,
        args=(refresh_interval,),
        daemon=True,
    )
    tui_thread.start()
    return tui_thread