using NeoModLoader.services;
using UnityEngine;

namespace IdleSpectator;

public static class CameraDirector
{
    public static string LastWatchLabel { get; private set; } = "";
    public static string LastWatchAssetId { get; private set; } = "";

    public static void FocusUnit(Actor actor, bool updateCaption = true)
    {
        if (actor != null && actor.isAlive())
        {
            RetargetFollow(actor);
            if (updateCaption && SpectatorMode.Active)
            {
                WatchCaption.SetFromActor(actor);
            }
        }
    }

    public static void Watch(InterestEvent interest)
    {
        if (interest == null || !interest.HasValidPosition)
        {
            return;
        }

        if (!Config.game_loaded || World.world == null)
        {
            return;
        }

        string tip = FormatWatchTip(interest);
        // LastWatchLabel is tip/harness telemetry only - never dossier reason truth.
        LastWatchLabel = interest.Label ?? "";
        LastWatchAssetId = interest.AssetId ?? "";
        LogService.LogInfo($"[IdleSpectator] {tip}");
        WatchCaption.SetFromInterest(interest);

        Actor follow = interest.HasFollowUnit
            ? interest.FollowUnit
            : null;

        // Species discovery: only attach a species-matched unit, never a random stranger.
        if (follow == null && !string.IsNullOrEmpty(interest.AssetId) && interest.AssetId != "live_battle"
            && interest.AssetId != "scored_unit" && interest.Label != null && interest.Label.StartsWith("New species:"))
        {
            follow = WorldActivityScanner.FindNearestAliveUnit(interest.Position, 24f, interest.AssetId);
        }
        // Location-only civic: pan only. Do not invent a stranger FollowUnit.

        if (follow != null && follow.isAlive())
        {
            // If this is a species event, refuse mismatched units.
            if (interest.Label != null && interest.Label.StartsWith("New species:")
                && !string.IsNullOrEmpty(interest.AssetId)
                && follow.asset != null && follow.asset.id != interest.AssetId)
            {
                Actor matched = WorldActivityScanner.FindNearestAliveUnit(interest.Position, 24f, interest.AssetId);
                if (matched == null)
                {
                    return;
                }

                follow = matched;
            }

            RetargetFollow(follow);
            return;
        }

        // No owned unit: pan only if we are not already following someone.
        // Never clear an existing focus unit here - that flashes the power bar.
        if (!MoveCamera.hasFocusUnit())
        {
            PanCamera(interest.Position);
        }
    }

    public static string FormatWatchTip(InterestEvent interest)
    {
        string reason = string.IsNullOrEmpty(interest.Label)
            ? "something interesting"
            : interest.Label;
        return $"Watching: {reason}";
    }

    public static void ClearFollow()
    {
        MoveCamera.clearFocusUnitOnly();
    }

    public static void PanTo(Vector3 pos)
    {
        PanCamera(pos);
    }

    private static void RetargetFollow(Actor actor)
    {
        if (MoveCamera.isCameraFollowingUnit(actor))
        {
            return;
        }

        bool firstFocus = !MoveCamera.hasFocusUnit();
        MoveCamera.setFocusUnit(actor);
        Chronicle.NoteFocus(actor);

        MoveCamera cam = MoveCamera.instance;
        if (cam == null)
        {
            return;
        }

        // Same as vanilla killer handoff: reset ease so the camera lerps to the new unit.
        cam._focus_timer = 0f;
        if (firstFocus)
        {
            cam._target_zoom = 15f;
            cam._focus_zoom = 15f;
        }
    }

    private static void PanCamera(Vector3 pos)
    {
        MoveCamera cam = MoveCamera.instance;
        if (cam == null)
        {
            World.world.locatePosition(pos);
            return;
        }

        pos.z = cam.transform.position.z;
        cam.transform.position = pos;
        cam._target_zoom = 15f;
        cam._focus_zoom = 15f;
    }
}