using System.Collections.Generic;
using UnityEngine;

namespace ShrinkTutorial
{
    [CreateAssetMenu(fileName = "ShrinkTutorialDatabase", menuName = "ShrinkSDK/引导/教程数据库")]
    public class ShrinkTutorialDatabase : ScriptableObject
    {
        [SerializeField] private List<ShrinkTutorialData> tutorials = new();

        private Dictionary<string, ShrinkTutorialData> _cache;

        public IReadOnlyList<ShrinkTutorialData> Tutorials => tutorials;

        public bool TryGetTutorial(string tutorialId, out ShrinkTutorialData tutorial)
        {
            EnsureCache();
            return _cache.TryGetValue(tutorialId, out tutorial);
        }

        public List<string> Validate()
        {
            var issues = new List<string>();
            var ids = new HashSet<string>();

            foreach (var tutorial in tutorials)
            {
                if (!tutorial)
                {
                    issues.Add("存在空的教程资源引用。");
                    continue;
                }

                if (string.IsNullOrWhiteSpace(tutorial.tutorialId))
                {
                    issues.Add($"教程资源 {tutorial.name} 缺少 tutorialId。");
                }
                else if (!ids.Add(tutorial.tutorialId))
                {
                    issues.Add($"tutorialId 重复: {tutorial.tutorialId}");
                }

                if (tutorial.steps == null || tutorial.steps.Count == 0)
                {
                    issues.Add($"教程 {tutorial.tutorialId} 没有任何步骤。");
                    continue;
                }

                for (var i = 0; i < tutorial.steps.Count; i++)
                {
                    var step = tutorial.steps[i];
                    if (step == null)
                    {
                        issues.Add($"教程 {tutorial.tutorialId} 第 {i + 1} 步为空。");
                        continue;
                    }

                    if (step.targetMode == ShrinkTutorialTargetMode.Path && string.IsNullOrWhiteSpace(step.targetPath))
                        issues.Add($"教程 {tutorial.tutorialId} 第 {i + 1} 步缺少 targetPath。");

                    if (step.targetMode == ShrinkTutorialTargetMode.AnchorId && string.IsNullOrWhiteSpace(step.anchorId))
                        issues.Add($"教程 {tutorial.tutorialId} 第 {i + 1} 步缺少 anchorId。");

                    if (step.completeCondition == ShrinkTutorialCompleteCondition.CustomEvent &&
                        string.IsNullOrWhiteSpace(step.customEventName))
                        issues.Add($"教程 {tutorial.tutorialId} 第 {i + 1} 步使用 CustomEvent 但未填写 customEventName。");
                }
            }

            return issues;
        }

        private void OnValidate()
        {
            _cache = null;
        }

        private void EnsureCache()
        {
            if (_cache != null)
                return;

            _cache = new Dictionary<string, ShrinkTutorialData>();
            foreach (var tutorial in tutorials)
            {
                if (!tutorial || string.IsNullOrWhiteSpace(tutorial.tutorialId))
                    continue;

                _cache[tutorial.tutorialId] = tutorial;
            }
        }
    }
}