using System;
using System.Collections.Generic;
using Microsoft.Extensions.Logging;
using MareSynchronos.WebAPI.AutoDetect;
using MareSynchronos.MareConfiguration;
using MareSynchronos.Services;
using MareSynchronos.Services.Mediator;
using NotificationType = MareSynchronos.MareConfiguration.Models.NotificationType;

namespace MareSynchronos.Services.AutoDetect;

public class AutoDetectRequestService
{
    private readonly ILogger<AutoDetectRequestService> _logger;
    private readonly DiscoveryConfigProvider _configProvider;
    private readonly DiscoveryApiClient _client;
    private readonly MareConfigService _configService;
    private readonly DalamudUtilService _dalamud;
    private readonly MareMediator _mediator;
    private readonly object _syncRoot = new();
    private readonly Dictionary<string, DateTime> _activeCooldowns = new(StringComparer.Ordinal);
    private readonly Dictionary<string, RefusalTracker> _refusalTrackers = new(StringComparer.Ordinal);
    private static readonly TimeSpan RequestCooldown = TimeSpan.FromMinutes(5);
    private static readonly TimeSpan RefusalLockDuration = TimeSpan.FromMinutes(15);

    public AutoDetectRequestService(ILogger<AutoDetectRequestService> logger, DiscoveryConfigProvider configProvider, DiscoveryApiClient client, MareConfigService configService, MareMediator mediator, DalamudUtilService dalamudUtilService)
    {
        _logger = logger;
        _configProvider = configProvider;
        _client = client;
        _configService = configService;
        _mediator = mediator;
        _dalamud = dalamudUtilService;
    }

    public async Task<bool> SendRequestAsync(string token, string? uid = null, string? targetDisplayName = null, CancellationToken ct = default)
    {
        if (!_configService.Current.AllowAutoDetectPairRequests)
        {
            _logger.LogDebug("Nearby request blocked: AllowAutoDetectPairRequests is disabled");
            _mediator.Publish(new NotificationMessage("Nearby request blocked", "Enable 'Allow pair requests' in Settings to send requests.", NotificationType.Info));
            return false;
        }
        var targetKey = BuildTargetKey(uid, token, targetDisplayName);
        if (!string.IsNullOrEmpty(targetKey))
        {
            var now = DateTime.UtcNow;
            lock (_syncRoot)
            {
                if (_refusalTrackers.TryGetValue(targetKey, out var tracker))
                {
                    if (tracker.LockUntil.HasValue && tracker.LockUntil.Value > now)
                    {
                        PublishLockNotification(tracker.LockUntil.Value - now);
                        return false;
                    }

                    if (tracker.LockUntil.HasValue && tracker.LockUntil.Value <= now)
                    {
                        tracker.LockUntil = null;
                        tracker.Count = 0;
                        if (tracker.Count == 0 && tracker.LockUntil == null)
                        {
                            _refusalTrackers.Remove(targetKey);
                        }
                    }
                }

                if (_activeCooldowns.TryGetValue(targetKey, out var lastSent))
                {
                    var elapsed = now - lastSent;
                    if (elapsed < RequestCooldown)
                    {
                        PublishCooldownNotification(RequestCooldown - elapsed);
                        return false;
                    }

                    if (elapsed >= RequestCooldown)
                    {
                        _activeCooldowns.Remove(targetKey);
                    }
                }
            }
        }
        var endpoint = _configProvider.RequestEndpoint;
        if (string.IsNullOrEmpty(endpoint))
        {
            _logger.LogDebug("No request endpoint configured");
            _mediator.Publish(new NotificationMessage("Nearby request failed", "Server does not expose request endpoint.", NotificationType.Error));
            return false;
        }
        string? displayName = null;
        try
        {
            var me = await _dalamud.RunOnFrameworkThread(() => _dalamud.GetPlayerCharacter()).ConfigureAwait(false);
            displayName = me?.Name.TextValue;
        }
        catch { }

        _logger.LogInformation("Nearby: sending pair request via {endpoint}", endpoint);
        var ok = await _client.SendRequestAsync(endpoint!, token, displayName, ct).ConfigureAwait(false);
        if (ok)
        {
            if (!string.IsNullOrEmpty(targetKey))
            {
                lock (_syncRoot)
                {
                    _activeCooldowns[targetKey] = DateTime.UtcNow;
                    if (_refusalTrackers.TryGetValue(targetKey, out var tracker))
                    {
                        tracker.Count = 0;
                        tracker.LockUntil = null;
                        if (tracker.Count == 0 && tracker.LockUntil == null)
                        {
                            _refusalTrackers.Remove(targetKey);
                        }
                    }
                }
            }
            _mediator.Publish(new NotificationMessage("Nearby request sent", "The other user will receive a request notification.", NotificationType.Info));
        }
        else
        {
            if (!string.IsNullOrEmpty(targetKey))
            {
                var now = DateTime.UtcNow;
                lock (_syncRoot)
                {
                    _activeCooldowns.Remove(targetKey);
                    if (!_refusalTrackers.TryGetValue(targetKey, out var tracker))
                    {
                        tracker = new RefusalTracker();
                        _refusalTrackers[targetKey] = tracker;
                    }

                    if (tracker.LockUntil.HasValue && tracker.LockUntil.Value <= now)
                    {
                        tracker.LockUntil = null;
                        tracker.Count = 0;
                    }

                    tracker.Count++;
                    if (tracker.Count >= 3)
                    {
                        tracker.LockUntil = now.Add(RefusalLockDuration);
                    }
                }
            }
            _mediator.Publish(new NotificationMessage("Nearby request failed", "The server rejected the request. Try again soon.", NotificationType.Warning));
        }
        return ok;
    }

    public async Task<bool> SendAcceptNotifyAsync(string targetUid, CancellationToken ct = default)
    {
        var endpoint = _configProvider.AcceptEndpoint;
        if (string.IsNullOrEmpty(endpoint))
        {
            _logger.LogDebug("No accept endpoint configured");
            return false;
        }
        string? displayName = null;
        try
        {
            var me = await _dalamud.RunOnFrameworkThread(() => _dalamud.GetPlayerCharacter()).ConfigureAwait(false);
            displayName = me?.Name.TextValue;
        }
        catch { }
        _logger.LogInformation("Nearby: sending accept notify via {endpoint}", endpoint);
        return await _client.SendAcceptAsync(endpoint!, targetUid, displayName, ct).ConfigureAwait(false);
    }

    private static string? BuildTargetKey(string? uid, string? token, string? displayName)
    {
        if (!string.IsNullOrEmpty(uid)) return "uid:" + uid;
        if (!string.IsNullOrEmpty(token)) return "token:" + token;
        if (!string.IsNullOrEmpty(displayName)) return "name:" + displayName;
        return null;
    }

    private void PublishCooldownNotification(TimeSpan remaining)
    {
        var durationText = FormatDuration(remaining);
        _mediator.Publish(new NotificationMessage("Nearby request en attente", $"Nearby request déjà envoyée. Merci d'attendre environ {durationText} avant de réessayer.", NotificationType.Info, TimeSpan.FromSeconds(5)));
    }

    private void PublishLockNotification(TimeSpan remaining)
    {
        var durationText = FormatDuration(remaining);
        _mediator.Publish(new NotificationMessage("Nearby request bloquée", $"Nearby request bloquée après plusieurs refus. Réessayez dans {durationText}.", NotificationType.Warning, TimeSpan.FromSeconds(5)));
    }

    private static string FormatDuration(TimeSpan remaining)
    {
        if (remaining.TotalMinutes >= 1)
        {
            var minutes = Math.Max(1, (int)Math.Ceiling(remaining.TotalMinutes));
            return minutes == 1 ? "1 minute" : minutes + " minutes";
        }

        var seconds = Math.Max(1, (int)Math.Ceiling(remaining.TotalSeconds));
        return seconds == 1 ? "1 seconde" : seconds + " secondes";
    }

    private sealed class RefusalTracker
    {
        public int Count;
        public DateTime? LockUntil;
    }
}