using NeoModLoader.services;
using UnityEngine;

namespace IdleSpectator;

/// <summary>
/// Picks the next interesting target using dwell, cooldown, and tier interrupts.
/// </summary>
public static class InterestDirector
{
    public const float MinDwellSeconds = 10f;
    public const float CuriosityDwellSeconds = 6f;
    public const float CuriosityRotateSeconds = 10f;
    public const float SwitchCooldownSeconds = 5f;
    public const float HighTierInterruptAfterSeconds = 3f;
    public const float QuietWorldAmbientAfterSeconds = 8f;
    public const float AmbientRotateSeconds = 20f;
    public const float ActionPollSeconds = 0.75f;

    private static InterestEvent _current;
    private static float _currentStartedAt = -999f;
    private static float _lastSwitchAt = -999f;
    private static float _lastInterestingAt = -999f;
    private static float _lastAmbientAt = -999f;
    private static float _lastActionPollAt = -999f;
    private static float _enabledAt = -999f;
    private const float InputExitGraceSeconds = 2.5f;

    public static void OnSpectatorEnabled()
    {
        InterestCollector.Clear();
        _current = null;
        float now = Time.unscaledTime;
        _currentStartedAt = now;
        _lastSwitchAt = now;
        _lastInterestingAt = now;
        _lastAmbientAt = -999f;
        _lastActionPollAt = -999f;
        _enabledAt = now;
        TryAmbient(force: true);
    }

    public static void OnSpectatorDisabled()
    {
        _current = null;
        InterestCollector.Clear();
    }

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

        if (Time.unscaledTime - _enabledAt >= InputExitGraceSeconds && PlayerTookManualControl())
        {
            SpectatorMode.SetActive(false);
            WorldTip.showNowTop("Idle Spectator paused (manual input)", pTranslate: false);
            return;
        }

        float now = Time.unscaledTime;
        float onCurrent = now - _currentStartedAt;
        float sinceSwitch = now - _lastSwitchAt;

        // Periodically surface live battles into the queue (Action tier).
        if (now - _lastActionPollAt >= ActionPollSeconds)
        {
            _lastActionPollAt = now;
            InterestEvent battle = WorldActivityScanner.FindHottestBattle();
            if (battle != null)
            {
                InterestCollector.EnqueueDirect(battle);
            }
        }

        if (InterestCollector.TryGetBest(out InterestEvent candidate))
        {
            if (candidate.HasValidPosition && CanSwitchTo(candidate, onCurrent, sinceSwitch))
            {
                InterestCollector.Remove(candidate);
                if (candidate.Tier >= InterestTier.Action)
                {
                    _lastInterestingAt = now;
                }
                SwitchTo(candidate, now);
                onCurrent = 0f;
                sinceSwitch = 0f;
            }
            else if (!candidate.HasValidPosition)
            {
                InterestCollector.Remove(candidate);
            }
            else if (candidate.Tier >= InterestTier.Action)
            {
                _lastInterestingAt = now;
            }
        }

        // Queued discovery tips beat ambient, but never stall ambient under Action/Story.
        if (InterestCollector.HasPendingAtLeast(InterestTier.Curiosity)
            && (_current == null || _current.Tier <= InterestTier.Curiosity))
        {
            return;
        }

        bool quiet = now - _lastInterestingAt >= QuietWorldAmbientAfterSeconds;
        bool dwellDone = _current == null || onCurrent >= DwellFor(_current);
        bool ambientDue = now - _lastAmbientAt >= AmbientRotateSeconds;
        if (_current == null && sinceSwitch >= 0.5f)
        {
            TryAmbient(force: true);
        }
        else if (quiet && dwellDone && ambientDue && sinceSwitch >= SwitchCooldownSeconds)
        {
            TryAmbient(force: false);
        }
    }

    /// <summary>
    /// True when a drained New species tip would be allowed to take the camera.
    /// </summary>
    public static bool WouldAcceptCuriosity()
    {
        if (_current == null)
        {
            return true;
        }

        float onCurrent = Time.unscaledTime - _currentStartedAt;
        float sinceSwitch = Time.unscaledTime - _lastSwitchAt;
        return CanSwitchTo(
            new InterestEvent { Tier = InterestTier.Curiosity },
            onCurrent,
            sinceSwitch);
    }

    private static bool PlayerTookManualControl()
    {
        // Rising-edge style checks only - avoid sticky flags like already_used_power
        // that can trip when the power bar flashes or a tip appears.
        if (MoveCamera.camera_drag_run)
        {
            return true;
        }

        if (Mathf.Abs(Input.mouseScrollDelta.y) > 0.01f)
        {
            return true;
        }

        if (HotkeyLibrary.left != null
            && (HotkeyLibrary.left.isHolding()
                || HotkeyLibrary.right.isHolding()
                || HotkeyLibrary.up.isHolding()
                || HotkeyLibrary.down.isHolding()))
        {
            return true;
        }

        if (HotkeyLibrary.zoom_in != null
            && (HotkeyLibrary.zoom_in.isHolding() || HotkeyLibrary.zoom_out.isHolding()))
        {
            return true;
        }

        if (!World.world.isOverUI()
            && (InputHelpers.GetMouseButtonDown(0) || InputHelpers.GetMouseButtonDown(1)))
        {
            return true;
        }

        return false;
    }

    private static float DwellFor(InterestEvent current)
    {
        if (current == null)
        {
            return MinDwellSeconds;
        }

        return current.Tier <= InterestTier.Curiosity ? CuriosityDwellSeconds : MinDwellSeconds;
    }

    private static bool CanSwitchTo(InterestEvent candidate, float onCurrent, float sinceSwitch)
    {
        if (_current == null)
        {
            return true;
        }

        // Curiosity is a footnote: never interrupt Action/Story/Epic.
        // Curiosity→curiosity uses a shorter rotate so discovery drains can surface.
        if (candidate.Tier == InterestTier.Curiosity)
        {
            if (_current.Tier >= InterestTier.Action)
            {
                return false;
            }

            if (_current.Tier == InterestTier.Curiosity && onCurrent < CuriosityRotateSeconds)
            {
                return false;
            }

            if (_current.Tier == InterestTier.Story)
            {
                return false;
            }
        }

        if (candidate.Tier > _current.Tier && onCurrent >= HighTierInterruptAfterSeconds)
        {
            return true;
        }

        return onCurrent >= DwellFor(_current) && sinceSwitch >= SwitchCooldownSeconds;
    }

    private static void SwitchTo(InterestEvent next, float now)
    {
        _current = next;
        _currentStartedAt = now;
        _lastSwitchAt = now;
        if (next.Tier >= InterestTier.Action)
        {
            _lastInterestingAt = now;
        }

        CameraDirector.Watch(next);
    }

    private static void TryAmbient(bool force)
    {
        float now = Time.unscaledTime;
        _lastAmbientAt = now;

        InterestEvent ambient = WorldActivityScanner.FindBestLiveTarget();
        if (ambient == null)
        {
            return;
        }

        if (!force && _current != null && _current.Tier >= InterestTier.Story)
        {
            return;
        }

        // Don't let ambient yank the camera off a curiosity tip after a few seconds.
        if (!force && _current != null && _current.Tier == InterestTier.Curiosity
            && now - _currentStartedAt < AmbientRotateSeconds)
        {
            return;
        }

        if (!force && now - _lastSwitchAt < SwitchCooldownSeconds && _current != null)
        {
            return;
        }

        // Avoid re-following the exact same unit every ambient tick.
        if (!force
            && _current != null
            && _current.FollowUnit != null
            && ambient.FollowUnit != null
            && _current.FollowUnit == ambient.FollowUnit
            && ambient.Tier <= InterestTier.Ambient)
        {
            return;
        }

        SwitchTo(ambient, now);
        LogService.LogInfo("[IdleSpectator] Ambient: " + ambient.Label);
    }
}