using NexusReader.Application.Abstractions.Services;
using NexusReader.Application.Queries.Graph;
using NexusReader.Application.Queries.Quiz;
using NexusReader.UI.Shared.Services;
using NexusReader.Application.DTOs.AI;
using Microsoft.Extensions.Logging;

namespace NexusReader.UI.Shared.Services;

public sealed partial class KnowledgeCoordinator : IDisposable
{
    private readonly IKnowledgeService _knowledgeService;
    private readonly IKnowledgeGraphService _graphService;
    private readonly IQuizStateService _quizService;
    private readonly IPlatformService _platformService;
    private readonly IReaderInteractionService _interactionService;
    private readonly ILogger<KnowledgeCoordinator> _logger;
    
    public event Action<GraphDataDto>? OnGraphUpdated;

    public KnowledgeCoordinator(
        IKnowledgeService knowledgeService,
        IKnowledgeGraphService graphService,
        IQuizStateService quizService,
        IPlatformService platformService,
        IReaderInteractionService interactionService,
        ILogger<KnowledgeCoordinator> logger)
    {
        _knowledgeService = knowledgeService;
        _graphService = graphService;
        _quizService = quizService;
        _platformService = platformService;
        _interactionService = interactionService;
        _logger = logger;

        _interactionService.OnNodeSelected += HandleNodeSelected;
    }

    private void HandleNodeSelected(string nodeId)
    {
        _interactionService.RequestScrollToBlock(nodeId);
        _interactionService.RequestHighlightBlock(nodeId);
    }

    public async Task ProcessFullPageAsync(string fullContent, string tenantId = "global")
    {
        if (string.IsNullOrWhiteSpace(fullContent)) return;

        LogGeneratingGraph(tenantId);
        
        _graphService.Clear();
        _graphService.SetLoading(true);
        
        try
        {
            var result = await _knowledgeService.GetGraphDataAsync(fullContent, tenantId);
            if (result.IsSuccess)
            {
                var packet = result.Value;
                if (packet.Graph != null)
                {
                    _graphService.UpdateGraph(packet.Graph);
                    OnGraphUpdated?.Invoke(packet.Graph);
                    await _platformService.VibrateSuccessAsync();
                }
            }
        }
        catch (Exception ex)
        {
            LogGraphError(ex, tenantId);
        }
    }

    public void OnBlockReached(string blockId, string content)
    {
        // Only update active node for "TU JESTEŚ" logic, do NOT trigger highlight here
        _graphService.SetActiveNode(blockId);
    }

    public async Task<KnowledgePacket?> RequestSummaryAndQuizAsync(string content, string tenantId = "global")
    {
        _quizService.SetHydrating(true);
        LogRequestingSummary(tenantId);
        try
        {
            var result = await _knowledgeService.GetSummaryAndQuizAsync(content, tenantId);
            if (result.IsSuccess)
            {
                var packet = result.Value;
                var quizQuestions = packet.Quizzes
                    .Select(q => new QuizQuestionDto(q.Question, q.Options, q.CorrectIndex))
                    .ToList();
                
                _quizService.SetQuiz(null, new QuizDto(quizQuestions));
                await _platformService.VibrateSuccessAsync();
                return packet;
            }

            LogSummaryWarning(tenantId);
        }
        catch (Exception ex)
        {
            LogSummaryError(ex, tenantId);
        }
        finally
        {
            _quizService.SetHydrating(false);
        }
        return null;
    }

    public void Clear()
    {
        _graphService.Clear();
        _quizService.SetQuiz(null, null);
    }

    public void Dispose()
    {
        _interactionService.OnNodeSelected -= HandleNodeSelected;
    }

    [LoggerMessage(Level = LogLevel.Information, Message = "[KnowledgeCoordinator] Generating full page graph for tenant: {TenantId}")]
    private partial void LogGeneratingGraph(string tenantId);

    [LoggerMessage(Level = LogLevel.Error, Message = "[KnowledgeCoordinator] Error generating graph for tenant: {TenantId}")]
    private partial void LogGraphError(Exception ex, string tenantId);

    [LoggerMessage(Level = LogLevel.Information, Message = "[KnowledgeCoordinator] Requesting summary and quiz for tenant: {TenantId}")]
    private partial void LogRequestingSummary(string tenantId);

    [LoggerMessage(Level = LogLevel.Warning, Message = "[KnowledgeCoordinator] Failed to get summary and quiz for tenant: {TenantId}")]
    private partial void LogSummaryWarning(string tenantId);

    [LoggerMessage(Level = LogLevel.Error, Message = "[KnowledgeCoordinator] Error requesting summary and quiz for tenant: {TenantId}")]
    private partial void LogSummaryError(Exception ex, string tenantId);
}