using NightclubArcadia.UI;
using Unity.Cinemachine;
using UnityEngine;

namespace NightclubArcadia.Cinematics
{
    /// <summary>
    /// Shifts CinemachinePositionComposer.Composition.ScreenPosition so the
    /// player is centred in the screen space left of the dialogue panel.
    /// </summary>
    public sealed class DialogueCameraFraming : MonoBehaviour
    {
        [SerializeField] CinemachinePositionComposer composer;
        [SerializeField] float dialogueScreenX = -0.17f;
        [SerializeField] bool suppressDeadZoneXInDialogue = true;

        float defaultDeadZoneX = 0.2f;

        void Start()
        {
            if (composer == null)
            {
                composer = FindFirstObjectByType<CinemachinePositionComposer>();
            }

            if (composer != null)
            {
                defaultDeadZoneX = composer.Composition.DeadZone.Size.x;
            }

            if (UIStateController.Instance != null)
            {
                UIStateController.Instance.StateChanged += OnStateChanged;
            }

            ApplyFraming();
        }

        void OnDestroy()
        {
            if (UIStateController.Instance != null)
            {
                UIStateController.Instance.StateChanged -= OnStateChanged;
            }
        }

        void OnStateChanged() => ApplyFraming();

        void ApplyFraming()
        {
            if (composer == null)
            {
                return;
            }

            var active = UIStateController.Instance != null && UIStateController.Instance.IsDialogueActive;
            var target = active ? dialogueScreenX : 0f;

            var composition = composer.Composition;
            composition.ScreenPosition = new Vector2(target, composition.ScreenPosition.y);

            if (suppressDeadZoneXInDialogue)
            {
                var size = composition.DeadZone.Size;
                size.x = active ? 0f : defaultDeadZoneX;
                composition.DeadZone.Size = size;
            }

            composer.Composition = composition;
        }
    }
}