"""Main trading dashboard UI orchestration."""
import logging
import queue
import threading
import time
from typing import Optional, Callable

from rich.console import Console
from rich.layout import Layout
from rich.live import Live
from rich.panel import Panel
from rich.text import Text

from .state import SharedState
from .log_handler import LogBuffer, UILogHandler
from .keyboard import KeyboardHandler
from .panels import (
    HeaderPanel,
    TabBar,
    LogPanel,
    HelpBar,
    build_summary_panel,
)
from ..db.database import TradingDatabase
from ..db.metrics import MetricsCalculator, PeriodMetrics

logger = logging.getLogger(__name__)


class TradingDashboard:
    """
    Main trading dashboard orchestrator.

    Runs in a separate thread and provides real-time UI updates
    while the trading loop runs in the main thread.
    """

    def __init__(
        self,
        state: SharedState,
        db: TradingDatabase,
        log_queue: queue.Queue,
        on_quit: Optional[Callable] = None,
    ):
        self.state = state
        self.db = db
        self.log_queue = log_queue
        self.on_quit = on_quit

        self.console = Console()
        self.log_buffer = LogBuffer(max_entries=1000)
        self.keyboard = KeyboardHandler()
        self.metrics_calculator = MetricsCalculator(db)

        self._running = False
        self._thread: Optional[threading.Thread] = None
        self._active_tab = 0
        self._cached_metrics: dict[int, PeriodMetrics] = {}
        self._last_metrics_refresh = 0.0

    def start(self) -> None:
        """Start the dashboard in a separate thread."""
        if self._running:
            return

        self._running = True
        self._thread = threading.Thread(target=self._run, daemon=True)
        self._thread.start()
        logger.debug("Dashboard thread started")

    def stop(self) -> None:
        """Stop the dashboard."""
        self._running = False
        if self._thread:
            self._thread.join(timeout=2.0)
        logger.debug("Dashboard thread stopped")

    def _run(self) -> None:
        """Main dashboard loop."""
        try:
            with self.keyboard:
                with Live(
                    self._build_layout(),
                    console=self.console,
                    refresh_per_second=1,
                    screen=True,
                ) as live:
                    while self._running and self.state.is_running():
                        # Process keyboard input
                        action = self.keyboard.get_action(timeout=0.1)
                        if action:
                            self._handle_action(action)

                        # Drain log queue
                        self.log_buffer.drain_queue(self.log_queue)

                        # Refresh metrics periodically (every 5 seconds)
                        now = time.time()
                        if now - self._last_metrics_refresh > 5.0:
                            self._refresh_metrics()
                            self._last_metrics_refresh = now

                        # Update display
                        live.update(self._build_layout())

                        # Small sleep to prevent CPU spinning
                        time.sleep(0.1)

        except Exception as e:
            logger.error(f"Dashboard error: {e}", exc_info=True)
        finally:
            self._running = False

    def _handle_action(self, action: str) -> None:
        """Handle keyboard action."""
        if action == "quit":
            logger.info("Quit requested from UI")
            self.state.stop()
            if self.on_quit:
                self.on_quit()

        elif action == "refresh":
            self._refresh_metrics()
            logger.debug("Manual refresh triggered")

        elif action == "filter":
            new_filter = self.log_buffer.cycle_filter()
            logger.debug(f"Log filter changed to: {new_filter}")

        elif action == "filter_trades":
            self.log_buffer.set_filter(LogBuffer.FILTER_TRADES)
            logger.debug("Log filter set to: trades")

        elif action == "filter_all":
            self.log_buffer.set_filter(LogBuffer.FILTER_ALL)
            logger.debug("Log filter set to: all")

        elif action == "filter_errors":
            self.log_buffer.set_filter(LogBuffer.FILTER_ERRORS)
            logger.debug("Log filter set to: errors")

        elif action == "tab_general":
            self._active_tab = 0
        elif action == "tab_monthly":
            if self._has_monthly_data():
                self._active_tab = 1
        elif action == "tab_weekly":
            if self._has_weekly_data():
                self._active_tab = 2
        elif action == "tab_daily":
            self._active_tab = 3

    def _refresh_metrics(self) -> None:
        """Refresh metrics from database."""
        try:
            self._cached_metrics[0] = self.metrics_calculator.get_all_time_metrics()
            self._cached_metrics[1] = self.metrics_calculator.get_monthly_metrics()
            self._cached_metrics[2] = self.metrics_calculator.get_weekly_metrics()
            self._cached_metrics[3] = self.metrics_calculator.get_daily_metrics()
        except Exception as e:
            logger.warning(f"Failed to refresh metrics: {e}")

    def _has_monthly_data(self) -> bool:
        """Check if monthly tab should be shown."""
        try:
            return self.metrics_calculator.has_monthly_data()
        except Exception:
            return False

    def _has_weekly_data(self) -> bool:
        """Check if weekly tab should be shown."""
        try:
            return self.metrics_calculator.has_weekly_data()
        except Exception:
            return False

    def _build_layout(self) -> Layout:
        """Build the complete dashboard layout."""
        layout = Layout()

        # Calculate available height
        term_height = self.console.height or 40

        # Header takes 3 lines
        # Help bar takes 1 line
        # Summary panel takes about 12-14 lines
        # Rest goes to logs
        log_height = max(8, term_height - 20)

        layout.split_column(
            Layout(name="header", size=3),
            Layout(name="summary", size=14),
            Layout(name="logs", size=log_height),
            Layout(name="help", size=1),
        )

        # Header
        layout["header"].update(HeaderPanel(self.state).render())

        # Summary panel with tabs
        current_metrics = self._cached_metrics.get(self._active_tab)
        tab_bar = TabBar(active_tab=self._active_tab)

        layout["summary"].update(
            build_summary_panel(
                state=self.state,
                metrics=current_metrics,
                tab_bar=tab_bar,
                has_monthly=self._has_monthly_data(),
                has_weekly=self._has_weekly_data(),
            )
        )

        # Log panel
        layout["logs"].update(LogPanel(self.log_buffer).render(height=log_height))

        # Help bar
        layout["help"].update(HelpBar().render())

        return layout


def setup_ui_logging(log_queue: queue.Queue) -> UILogHandler:
    """
    Set up logging to capture messages for UI.

    Args:
        log_queue: Queue to send log messages to

    Returns:
        UILogHandler instance
    """
    handler = UILogHandler(log_queue)
    handler.setLevel(logging.INFO)

    # Add handler to root logger
    root_logger = logging.getLogger()
    root_logger.addHandler(handler)

    return handler