// <copyright file="ModelGeneratorHelper.cs" company="MUnique">
// Licensed under the MIT License. See LICENSE file in the project root for full license information.
// </copyright>

namespace MUnique.OpenMU.Persistence.SourceGenerator;

using System.Reflection;
using MUnique.OpenMU.DataModel;

/// <summary>
/// Helper class containing shared functionality for model generators.
/// </summary>
internal static class ModelGeneratorHelper
{
    private static IList<Type> _customTypes;

    /// <summary>
    /// Gets a header template for a generated file.
    /// </summary>
    public static string FileHeaderTemplate => @"// <copyright file=""{0}.Generated.cs"" company=""MUnique"">
// Licensed under the MIT License. See LICENSE file in the project root for full license information.
// </copyright>

//------------------------------------------------------------------------------
// <auto-generated>
//     This source code was auto-generated by a roslyn code generator.
// </auto-generated>
//------------------------------------------------------------------------------

// ReSharper disable All";

    /// <summary>
    /// Gets the namespace of the configuration classes.
    /// </summary>
    public static string ConfigurationNamespace => "MUnique.OpenMU.DataModel.Configuration";

    /// <summary>
    /// Gets the types which need to be customized for persistence.
    /// </summary>
    public static IEnumerable<Type> CustomTypes => _customTypes ??= GetCustomTypes();

    /// <summary>
    /// Determines whether the given type is a configuration type.
    /// </summary>
    /// <param name="type">The type.</param>
    /// <returns><c>true</c> if the given type is a configuration type; otherwise, <c>false</c>.</returns>
    public static bool IsConfigurationType(Type type)
    {
        if (type.Namespace != null
            && type.Namespace.StartsWith(ConfigurationNamespace, StringComparison.InvariantCulture))
        {
            return true;
        }

        if (type.BaseType is { Namespace: { } }
            && type.BaseType.Namespace.StartsWith(ConfigurationNamespace, StringComparison.InvariantCulture))
        {
            return true;
        }

        if (type.Name.Contains("Definition", StringComparison.InvariantCulture))
        {
            return true;
        }

        if (type.Name is "AttributeRelationship" or "PlugInConfiguration" or "ConstValueAttribute")
        {
            return true;
        }

        return false;
    }

    /// <summary>
    /// Gets the parameter definitions for a method or constructor.
    /// </summary>
    /// <param name="parameters">The parameters.</param>
    /// <returns>The string of the parameter definitions.</returns>
    public static string GetParameterDefinitions(ICollection<ParameterInfo> parameters)
    {
        var result = new StringBuilder();
        foreach (var p in parameters)
        {
            result.Append(p.ParameterType.GetCSharpFullName())
                .Append(" ")
                .Append(p.Name);
            if (parameters.Count > p.Position + 1)
            {
                result.Append(", ");
            }
        }

        return result.ToString();
    }

    /// <summary>
    /// Gets the parameters used to call a method.
    /// </summary>
    /// <param name="parameters">The parameter infos.</param>
    /// <returns>The parameters used to call a method.</returns>
    public static string GetParameters(ICollection<ParameterInfo> parameters)
    {
        var result = new StringBuilder();
        foreach (var p in parameters)
        {
            result.Append(p.Name);
            if (parameters.Count > p.Position + 1)
            {
                result.Append(", ");
            }
        }

        return result.ToString();
    }

    /// <summary>
    /// Overrides the <see cref="ICloneable{T}"/> implementation, so that the correct class instance
    /// is created and the id is assigned.
    /// </summary>
    /// <param name="type">The type.</param>
    /// <param name="className">Name of the class.</param>
    /// <returns>The implementation for <see cref="ICloneable{T}"/>.</returns>
    public static string OverrideClonable(Type type, string className)
    {
        return $$"""
                     /// <inheritdoc />
                     public override {{type.Namespace}}.{{className}} Clone(MUnique.OpenMU.DataModel.Configuration.GameConfiguration gameConfiguration)
                     {
                         var clone = new {{className}}();
                         clone.AssignValuesOf(this, gameConfiguration);
                         return clone;
                     }
                     
                     /// <inheritdoc />
                     public override void AssignValuesOf({{type.Namespace}}.{{className}} other, MUnique.OpenMU.DataModel.Configuration.GameConfiguration gameConfiguration)
                     {
                         base.AssignValuesOf(other, gameConfiguration);
                         this.Id = other.GetId();
                     }

                 """;
    }

    /// <summary>
    /// Determines the types which require customization.
    /// </summary>
    /// <returns>The types that require customization.</returns>
    private static List<Type> GetCustomTypes()
    {
        var result = new List<Type>();

        var loadedTypes = typeof(DataModel.Attributes.PowerUpDefinition).Assembly.GetTypes()
            .Where(type => type.IsClass && type.IsPublic)
            .Where(type => !type.IsSealed && !type.IsAbstract && type.GetConstructor([]) != null).ToList();
        result.AddRange(loadedTypes);
        result.Add(typeof(MUnique.OpenMU.AttributeSystem.AttributeDefinition));
        result.Add(typeof(MUnique.OpenMU.AttributeSystem.StatAttribute));
        result.Add(typeof(MUnique.OpenMU.AttributeSystem.ConstValueAttribute));
        result.Add(typeof(MUnique.OpenMU.AttributeSystem.AttributeRelationship));
        result.Add(typeof(MUnique.OpenMU.Interfaces.LetterHeader));
        result.Add(typeof(MUnique.OpenMU.Interfaces.Friend));
        result.Add(typeof(MUnique.OpenMU.PlugIns.PlugInConfiguration));

        return result;
    }
}