using NeoModLoader.services;
using UnityEngine;

namespace IdleSpectator;

/// <summary>
/// Samples focus / spectator / power-bar state and logs only on changes or faults.
/// Tail Player.log for <c>[IdleSpectator][STATE]</c> and <c>[IdleSpectator][BAD]</c>.
/// </summary>
public static class StateProbe
{
    private static bool _prevIdle;
    private static bool _prevFocus;
    private static bool _prevVanillaSpec;
    private static bool _prevBar;
    private static string _prevUnit = "";
    private static float _focusLostSince = -1f;
    private static float _lastHeartbeatAt = -999f;
    private static float _lastBadPowerBarAt = -999f;
    private static float _lastBadGapAt = -999f;
    private static bool _hadFocusWhileIdle;
    private const float HeartbeatSeconds = 10f;
    private const float FocusGapBadSeconds = 0.35f;

    public static int BadEventCount { get; private set; }
    public static int StateEventCount { get; private set; }

    public static void ResetCounters()
    {
        BadEventCount = 0;
        StateEventCount = 0;
        _lastBadPowerBarAt = -999f;
        _lastBadGapAt = -999f;
        _focusLostSince = -1f;
        _lastHeartbeatAt = -999f;
        _hadFocusWhileIdle = false;
    }

    public static void Update()
    {
        if (!ModSettings.DebugStateProbe || !Config.game_loaded || World.world == null)
        {
            return;
        }

        bool idle = SpectatorMode.Active;
        bool focus = MoveCamera.hasFocusUnit();
        bool vanillaSpec = MoveCamera.inSpectatorMode();
        bool bar = CanvasMain.isBottomBarShowing();
        string unit = FocusUnitLabel();

        bool changed = idle != _prevIdle
            || focus != _prevFocus
            || vanillaSpec != _prevVanillaSpec
            || bar != _prevBar
            || unit != _prevUnit;

        if (changed)
        {
            StateEventCount++;
            LogService.LogInfo(
                $"[IdleSpectator][STATE] idle={idle} focus={focus} vanillaSpec={vanillaSpec} powerBar={bar} unit={unit}");
        }

        if (idle && focus)
        {
            _hadFocusWhileIdle = true;
        }

        if (idle && _prevFocus && !focus)
        {
            BadEventCount++;
            LogService.LogInfo("[IdleSpectator][BAD] focus dropped while Idle Spectator is on");
            _focusLostSince = Time.unscaledTime;
        }

        // Only treat prolonged no-focus as bad after we have successfully acquired a target.
        // Fresh maps often have a short empty window before the first unit exists.
        if (idle && !focus && _hadFocusWhileIdle)
        {
            if (_focusLostSince < 0f)
            {
                _focusLostSince = Time.unscaledTime;
            }
            else if (Time.unscaledTime - _focusLostSince >= FocusGapBadSeconds
                     && Time.unscaledTime - _lastBadGapAt >= 1f)
            {
                _lastBadGapAt = Time.unscaledTime;
                BadEventCount++;
                LogService.LogInfo(
                    $"[IdleSpectator][BAD] no focus unit for {Time.unscaledTime - _focusLostSince:0.00}s while idle on (power bar risk)");
            }
        }
        else if (focus)
        {
            _focusLostSince = -1f;
        }

        if (idle && bar && Time.unscaledTime - _lastBadPowerBarAt >= 1f)
        {
            _lastBadPowerBarAt = Time.unscaledTime;
            BadEventCount++;
            LogService.LogInfo("[IdleSpectator][BAD] power bar showing while Idle Spectator is on");
        }

        if (idle && Time.unscaledTime - _lastHeartbeatAt >= HeartbeatSeconds)
        {
            _lastHeartbeatAt = Time.unscaledTime;
            StateEventCount++;
            LogService.LogInfo(
                $"[IdleSpectator][STATE] heartbeat idle={idle} focus={focus} vanillaSpec={vanillaSpec} powerBar={bar} unit={unit}");
        }

        _prevIdle = idle;
        _prevFocus = focus;
        _prevVanillaSpec = vanillaSpec;
        _prevBar = bar;
        _prevUnit = unit;
    }

    public static void Reset()
    {
        _prevIdle = false;
        _prevFocus = false;
        _prevVanillaSpec = false;
        _prevBar = false;
        _prevUnit = "";
        _focusLostSince = -1f;
        _lastHeartbeatAt = -999f;
        ResetCounters();
    }

    private static string FocusUnitLabel()
    {
        if (!MoveCamera.hasFocusUnit())
        {
            return "-";
        }

        Actor unit = MoveCamera._focus_unit;
        if (unit == null)
        {
            return "?";
        }

        try
        {
            string name = unit.getName();
            if (!string.IsNullOrEmpty(name))
            {
                return name;
            }
        }
        catch
        {
            // ignore
        }

        return unit.asset != null ? unit.asset.id : "unit";
    }
}