using System;
using System.Collections.Generic;
using System.Linq;

namespace SessionZero.Data;

[SzfObject(SzfObjectType.Dataset, "dataset")]
public class Dataset : SzfObject
{
    public string DatasetType { get; set; } = string.Empty;
    public string ImageUrl { get; set; } = string.Empty; // New field for dataset image
    public List<DatasetEntry> Entries { get; set; } = new();
    public Dictionary<string, object> Metadata { get; set; } = new(); // To store other metadata fields

    public override SzfObjectType ObjectType => SzfObjectType.Dataset;

    public override void PopulateFromMetadata(Dictionary<string, SzfField> metadata)
    {
        base.PopulateFromMetadata(metadata);

        if (metadata.TryGetValue("Type", out var typeField))
            DatasetType = typeField.Value?.ToString() ?? string.Empty;

        if (metadata.TryGetValue("ImageUrl", out var imageUrlField))
            ImageUrl = imageUrlField.Value?.ToString() ?? string.Empty;

        // Store any other metadata fields not explicitly mapped
        foreach (var kvp in metadata)
        {
            if (!new[] { "Name", "Version", "GUID", "Description", "Author", "Type", "ImageUrl" }
                    .Contains(kvp.Key, StringComparer.OrdinalIgnoreCase))
            {
                Metadata[kvp.Key] = kvp.Value.Value!;
            }
        }
    }

    public override void ParseSections(List<SzfSection> sections)
    {
        var currentEntry = (DatasetEntry?)null;

        foreach (var szfSection in sections)
        {
            if (szfSection.Name.StartsWith("Entry:", StringComparison.OrdinalIgnoreCase))
            {
                currentEntry = new DatasetEntry
                {
                    Name = szfSection.Name.Replace("Entry:", "").Trim()
                };

                foreach (var field in szfSection.Fields)
                {
                    currentEntry.Fields.Add(ConvertToDatasetField(field));
                }

                Entries.Add(currentEntry);
            }
            else if (szfSection.Name.StartsWith("Entry.", StringComparison.OrdinalIgnoreCase) && currentEntry != null)
            {
                // Handle subsections by finding their parent entry
                var parts = szfSection.Name.Split('.');
                if (parts.Length >= 2 && parts[0].Equals("Entry", StringComparison.OrdinalIgnoreCase) &&
                    parts[1].Equals(currentEntry.Name, StringComparison.OrdinalIgnoreCase))
                {
                    var subSection = new DatasetSection
                    {
                        Name = string.Join(".", parts.Skip(2)).Trim() // Name for the subsection
                    };

                    foreach (var field in szfSection.Fields)
                    {
                        subSection.Fields.Add(ConvertToDatasetField(field));
                    }

                    currentEntry.Sections.Add(subSection);
                }
            }
        }
    }

    private DatasetField ConvertToDatasetField(SzfField szfField)
    {
        // You would typically parse more properties here like Description, IsRequired etc.
        // For simplicity, only Name, Type and Value are mapped for now.
        return new DatasetField
        {
            Name = szfField.Name,
            Type = ParseDatasetFieldType(szfField.Type),
            Value = szfField.Value
        };
    }

    private DatasetFieldType ParseDatasetFieldType(string typeString)
    {
        return typeString.ToLower() switch
        {
            "text" => DatasetFieldType.Text,
            "text-field" => DatasetFieldType.TextField,
            "number" => DatasetFieldType.Number,
            "bool" => DatasetFieldType.Boolean,
            "calculated" => DatasetFieldType.Calculated,
            "system" => DatasetFieldType.System,
            "dataset-reference" => DatasetFieldType.DatasetReference,
            "dataset-type" => DatasetFieldType.DatasetType,
            "dataset-reference-multiple" => DatasetFieldType.DatasetReferenceMultiple,
            "dataset-type-multiple" => DatasetFieldType.DatasetTypeMultiple,
            "group" => DatasetFieldType.Group,
            _ => DatasetFieldType.Text // Default to text if unknown
        };
    }

    public override void GenerateMetadata(SzfFieldWriter writer)
    {
        // Call base to ensure common metadata is generated first if base had any specific generation logic
        base.GenerateMetadata(writer);

        writer.WriteField("Type", "text", DatasetType);
        if (!string.IsNullOrEmpty(ImageUrl))
            writer.WriteField("ImageUrl", "text", ImageUrl);

        // Write any other dynamic metadata
        foreach (var kvp in Metadata)
        {
            writer.WriteField(kvp.Key, "text", kvp.Value); // Assuming text for generic metadata for now
        }
    }

    public override void GenerateContent(SzfFieldWriter writer)
    {
        foreach (var entry in Entries)
        {
            writer.AppendSectionHeader($"Entry: {entry.Name}");

            foreach (var field in entry.Fields)
            {
                writer.WriteField(field.Name, field.Type, field.Value);
            }

            foreach (var section in entry.Sections)
            {
                GenerateDatasetSection(writer, section, $"Entry.{entry.Name}");
            }

            writer.AppendLine();
        }
    }

    private void GenerateDatasetSection(SzfFieldWriter writer, DatasetSection section, string parentPath)
    {
        var sectionPath = $"{parentPath}.{section.Name}";
        writer.AppendSectionHeader(sectionPath);

        foreach (var field in section.Fields)
        {
            writer.WriteField(field.Name, field.Type, field.Value);
        }

        foreach (var subsection in section.Subsections)
        {
            GenerateDatasetSection(writer, subsection, sectionPath);
        }
    }

    public override SzfValidationResult Validate()
    {
        var result = base.Validate();

        if (string.IsNullOrWhiteSpace(DatasetType))
            result.AddError("DatasetType is required for Dataset");

        if (!Entries.Any())
            result.AddWarning("Dataset contains no entries.");

        return result;
    }
}

public class DatasetEntry
{
    public string Name { get; set; } = string.Empty;
    public List<DatasetField> Fields { get; set; } = new();
    public List<DatasetSection> Sections { get; set; } = new(); // For nested sections within an entry
}

public class DatasetSection
{
    public string Name { get; set; } = string.Empty;
    public List<DatasetField> Fields { get; set; } = new();
    public List<DatasetSection> Subsections { get; set; } = new();
}

public class DatasetField
{
    public string Name { get; set; } = string.Empty;
    public DatasetFieldType Type { get; set; }
    public object? Value { get; set; }
    public string? Description { get; set; }
    public bool IsRequired { get; set; }
    public object? DefaultValue { get; set; }
    public string? Formula { get; set; }
    public string? ReferencedDatasetId { get; set; } // For dataset-reference types, stores the ID
    public string? ReferencedDatasetType { get; set; } // For dataset-type types, stores the type
    public bool AllowMultiple { get; set; }
    public List<DatasetField> GroupFields { get; set; } = new(); // For group fields
}

public enum DatasetFieldType
{
    Text,
    TextField,
    Number,
    Boolean,
    Calculated,
    System,
    DatasetReference,
    DatasetType,
    DatasetReferenceMultiple,
    DatasetTypeMultiple,
    Group
}

public class DatasetReference
{
    public string Name { get; set; } = string.Empty;
    public Guid Guid { get; set; }
    public string Version { get; set; } = "1.0.0";

    public override string ToString()
    {
        return $"{Name}|{Guid}|{Version}";
    }

    public static DatasetReference? Parse(string reference)
    {
        if (string.IsNullOrWhiteSpace(reference))
            return null;

        var parts = reference.Split('|');
        if (parts.Length != 3)
            return null; // Invalid format

        if (Guid.TryParse(parts[1], out var guid))
        {
            return new DatasetReference
            {
                Name = parts[0],
                Guid = guid,
                Version = parts[2]
            };
        }

        return null; // Invalid GUID format
    }
}

public class DatasetValidationResult : SzfValidationResult
{
    // Specific validation results for datasets can go here if needed
}