using System;
using System.Collections.Generic;
using UnityEditor;

namespace Module.ProjectValidator.Editor
{
    internal sealed class Report
    {
        public static Report Active { get; private set; }
        public static bool HasActive => Active != null;
        
        public readonly List<Entry> Entries = new();
        private readonly Dictionary<GUID, MappingEntry> _assetToSeverityMapping = new();
        private readonly Dictionary<int, MappingEntry> _instanceToSeverityMapping = new();

        public void Add(GUID assetGuid, string scenePath, string fieldPath, Attribute attribute, EValidatorSeverity severity, string message)
        {
            Entries.Add(new Entry
            {
                AssetGuid = assetGuid,
                AssetName = EditorAssetUtility.GetAssetName(assetGuid),
                ScenePath = scenePath,
                FieldPath = fieldPath,
                ScenePathRichText = ProjectValidatorUtility.ApplyRichTextToScenePath(scenePath),
                FieldPathRichText = ProjectValidatorUtility.ApplyRichTextToFieldPath(fieldPath),
                Type = ProjectValidatorUtility.GetAttributeShortName(attribute),
                Severity =  severity,
                SeverityStr = severity.ToString(),
                SeverityResult = message
            });

            if (_assetToSeverityMapping.TryGetValue(assetGuid, out var mapping))
            {
                if (mapping.Severity < severity)
                    _assetToSeverityMapping[assetGuid] = new MappingEntry(severity, false);
            }
            else
            {
                _assetToSeverityMapping.Add(assetGuid, new MappingEntry(severity, false));
            }
        }

        public void RebuildAssetMapping()
        {
            ProjectValidatorUtility.RebuildAssetMapping(_assetToSeverityMapping);
        }

        public void RebuildInstanceMapping()
        {
            ProjectValidatorUtility.RebuildSceneInstanceMapping(this, _instanceToSeverityMapping);
        }
        
        public bool TryGetSeverityFor(string guid, out MappingEntry mapping)
        {
            if (GUID.TryParse(guid, out var assetGuid) && _assetToSeverityMapping.TryGetValue(assetGuid, out mapping))
                return true;

            mapping = new MappingEntry();
            return false;
        }
        
        public bool TryGetSeverityFor(int instanceId, out MappingEntry mapping)
        {
            if (_instanceToSeverityMapping.TryGetValue(instanceId, out mapping))
                return true;

            mapping = new MappingEntry();
            return false;
        }
        
        public bool TryGetSeverityFor(GUID assetGuid, string scenePath, out MappingEntry mapping)
        {
            if (!_assetToSeverityMapping.TryGetValue(assetGuid, out mapping))
                return false;

            mapping = new MappingEntry();
            
            for (var i = 0; i < Entries.Count; i++)
            {
                if (Entries[i].AssetGuid != assetGuid || Entries[i].ScenePath != scenePath || Entries[i].Severity <= mapping.Severity)
                    continue;

                mapping = new MappingEntry(Entries[i].Severity, false);

                if (mapping.Severity == EValidatorSeverity.MaxSeverityLevel)
                    break;
            }

            return mapping.Severity != EValidatorSeverity.Valid;
        }

        public void SetAsActive()
        {
            Active = this;
        }
        
        public static void ClearActive()
        {
            Active = null;
        }

        public struct Entry
        {
            public GUID AssetGuid;
            public string AssetName;
            
            public string ScenePath;
            public string FieldPath;
            
            public string ScenePathRichText;
            public string FieldPathRichText;
            
            public string Type;
            public EValidatorSeverity Severity;
            public string SeverityStr;
            public string SeverityResult;

            public bool Filter(string filter)
            {
                return AssetName.Contains(filter,  StringComparison.InvariantCultureIgnoreCase) ||  
                       ScenePath.Contains(filter,  StringComparison.InvariantCultureIgnoreCase) || 
                       FieldPath.Contains(filter,  StringComparison.InvariantCultureIgnoreCase) ||
                       Type.Contains(filter, StringComparison.InvariantCultureIgnoreCase) ||
                       SeverityResult.Contains(filter, StringComparison.InvariantCultureIgnoreCase) ||
                       SeverityStr.Contains(filter, StringComparison.InvariantCultureIgnoreCase);
            }
        }

        public struct MappingEntry
        {
            public readonly EValidatorSeverity Severity;
            public readonly bool IsRedirect;

            public MappingEntry(EValidatorSeverity severity, bool isRedirect)
            {
                Severity = severity;
                IsRedirect = isRedirect;
            }
        }
    }
}