using System.Collections;
using TMPro;
using UnityEngine;

namespace NightclubArcadia.Skills
{
    /// <summary>
    /// Transparent roll banner. Must show roll, each of the three modifiers, total, and DC.
    /// </summary>
    public sealed class SkillCheckResultView : MonoBehaviour
    {
        [SerializeField] CanvasGroup group;
        [SerializeField] TMP_Text label;
        [SerializeField] float holdSeconds = 1.6f;
        [SerializeField] float fadeSeconds = 0.15f;

        void Awake()
        {
            if (group != null)
            {
                group.alpha = 0f;
                group.blocksRaycasts = false;
                group.interactable = false;
            }
        }

        public IEnumerator Show(SkillCheckResult result)
        {
            if (label != null)
            {
                label.text = Format(result);
                label.color = ResolveAccent(result.SkillId);
            }

            if (group == null)
            {
                yield return new WaitForSeconds(holdSeconds);
                yield break;
            }

            yield return Fade(0f, 1f);
            yield return new WaitForSeconds(holdSeconds);
            yield return Fade(1f, 0f);
        }

        static Color ResolveAccent(string skillId)
        {
            var runtime = SkillRuntime.Instance;
            if (runtime != null &&
                runtime.Database != null &&
                runtime.Database.TryGet(skillId, out var def) &&
                def != null)
            {
                return def.AccentColor;
            }

            return Color.white;
        }

        static string Format(SkillCheckResult r)
        {
            var outcome = r.Degree switch
            {
                SkillCheckDegree.CriticalSuccess => "CRITICAL SUCCESS",
                SkillCheckDegree.CriticalFailure => "CRITICAL FAILURE",
                SkillCheckDegree.Success => "SUCCESS",
                _ => "FAILURE",
            };

            var name = string.IsNullOrEmpty(r.SkillDisplayName)
                ? (r.SkillId ?? string.Empty).ToUpperInvariant()
                : r.SkillDisplayName.ToUpperInvariant();

            return $"{name} — d20 {r.Roll} {Signed(r.RankMod)} rank {Signed(r.SituationalMod)} situation {Signed(r.StateMod)} state = {r.Total} vs DC {r.DC} · {outcome}";
        }

        static string Signed(int value) => value >= 0 ? $"+{value}" : value.ToString();

        IEnumerator Fade(float from, float to)
        {
            if (fadeSeconds <= 0f)
            {
                group.alpha = to;
                yield break;
            }

            var elapsed = 0f;
            while (elapsed < fadeSeconds)
            {
                elapsed += Time.unscaledDeltaTime;
                group.alpha = Mathf.Lerp(from, to, Mathf.Clamp01(elapsed / fadeSeconds));
                yield return null;
            }

            group.alpha = to;
        }
    }
}