using System;
using System.Collections.Generic;
using System.Linq;
using Microsoft.SemanticKernel.ChatCompletion;

namespace AI.Models.Store
{
    public static class ConversationEntryMapper
    {
        public static List<ConversationEntryDto> ToDtoList(IEnumerable<ConversationEntry>? entries)
        {
            if (entries == null)
            {
                return new List<ConversationEntryDto>();
            }

            return entries.Select(e =>
            {
                if (e is TextConversationEntry t)
                {
                    return new ConversationEntryDto
                    {
                        Kind = t.Kind,
                        Role = t.Role.ToString(),
                        Content = t.Content
                    };
                }

                if (e is SpecialConversationEntry s)
                {
                    return new ConversationEntryDto
                    {
                        Kind = s.Kind,
                        Type = s.Type,
                        Payload = s.Payload
                    };
                }

                return new ConversationEntryDto { Kind = e?.Kind ?? string.Empty };
            }).ToList();
        }

        public static List<ConversationEntry> ToEntryList(IEnumerable<ConversationEntryDto>? entries)
        {
            var list = new List<ConversationEntry>();
            if (entries == null)
            {
                return list;
            }

            foreach (var e in entries)
            {
                if (e == null) continue;

                if (string.Equals(e.Kind, "Text", StringComparison.OrdinalIgnoreCase))
                {
                    var role = AuthorRole.User;
                    if (!string.IsNullOrEmpty(e.Role) && Enum.TryParse<AuthorRole>(e.Role, true, out var r))
                    {
                        role = r;
                    }
                    list.Add(new TextConversationEntry(role, e.Content ?? string.Empty));
                }
                else if (string.Equals(e.Kind, "Special", StringComparison.OrdinalIgnoreCase))
                {
                    list.Add(new SpecialConversationEntry(e.Type ?? string.Empty, e.Payload ?? string.Empty));
                }
            }

            return list;
        }
    }
}