using UnityEngine;
using Yarn.Unity;

namespace NightclubArcadia.Skills
{
    /// <summary>
    /// Composition root and singleton that static Yarn commands route through.
    /// </summary>
    public sealed class SkillRuntime : MonoBehaviour
    {
        public static SkillRuntime Instance { get; private set; }

        [SerializeField] SkillDatabase database;
        [SerializeField] DialogueRunner dialogueRunner;
        [SerializeField] SkillCheckResultView resultView;
        [SerializeField] CommentarySystem commentary;
        [SerializeField] int rollSeed;
        [SerializeField] string debugContextId = "Entrance_Queue";

        public SkillDatabase Database => database;
        public DialogueRunner DialogueRunner => dialogueRunner;
        public SkillCheckResultView ResultView => resultView;
        public CommentarySystem Commentary => commentary;
        public PlayerSkills Skills { get; private set; }
        public SkillStateModifiers States { get; private set; }
        public SkillCheckSystem Checks { get; private set; }
        public IRollSource Rolls { get; private set; }

        void Awake()
        {
            if (Instance != null && Instance != this)
            {
                Debug.LogError($"[{nameof(SkillRuntime)}] Duplicate instance on '{name}'. Destroying this component.", this);
                Destroy(this);
                return;
            }

            Instance = this;

            if (database == null)
            {
                Debug.LogError($"[{nameof(SkillRuntime)}] SkillDatabase is not assigned.", this);
            }

            Skills = database != null ? new PlayerSkills(database) : null;
            States = new SkillStateModifiers();
            Rolls = rollSeed != 0 ? (IRollSource)new SeededRollSource(rollSeed) : new UnityRollSource();

            if (Skills != null)
            {
                Checks = new SkillCheckSystem(database, Skills, States, Rolls);
            }
        }

        void OnDestroy()
        {
            if (Instance == this)
            {
                Instance = null;
            }
        }

        [ContextMenu("Fire Commentary (debug)")]
        void FireCommentaryDebug()
        {
            if (commentary == null)
            {
                Debug.LogWarning($"[{nameof(SkillRuntime)}] No CommentarySystem assigned.", this);
                return;
            }

            commentary.RequestCommentary(debugContextId);
        }
    }
}