using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.Json.Serialization;
using System.Threading.Tasks;
using FinlyticAssets.Models;
using FinlyticBackend.Util;
using FinlyticCore.Dtos;
using FinlyticCore.Dtos.Fundamentals;
using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Extensions.Logging;

namespace FinlyticBackend.Controllers;


[ApiController]
[Authorize]
[Route("api/v1/calendar")]
public class CalendarController : ControllerBase
{
    private readonly WebMqttClient _mqttClient;
    private readonly ILogger<CalendarController> _logger;

    public CalendarController(WebMqttClient mqttClient, ILogger<CalendarController> logger)
    {
        _mqttClient = mqttClient;
        _logger = logger;
    }

    /// <summary>
    /// Retrieves corporate calendar events with optional filters.
    /// </summary>
    [HttpGet("events/{year:int?}/{month:int?}")]
    public async Task<IActionResult> GetCorporateCalendar(
        int? year = null,
        int? month = null,
        [FromQuery] string? category = null,
        [FromQuery] DateTime? date = null,
        [FromQuery] string? symbol = null,
        [FromQuery] string? isin = null)
    {
        string? activeSymbol = !string.IsNullOrWhiteSpace(symbol) ? symbol.Trim() : isin?.Trim();
        int targetYear = year ?? DateTime.UtcNow.Year;
        int targetMonth = month ?? DateTime.UtcNow.Month;

        try
        {
            if (_mqttClient.IsConnected)
            {
                var rawEvents = await _mqttClient.SendRpcRequestAsync<List<CorporateEventDto>, GetEventsByMonthRequest>(
                    "events_GetByMonth",
                    new GetEventsByMonthRequest(targetYear, targetMonth),
                    TimeSpan.FromSeconds(4)
                );

                if (rawEvents != null && rawEvents.Count > 0)
                {
                    var allAssets = AssetsController.LoadAssetsFromIndexJson() ?? new List<AssetIndex>();
                    var isinLookup = allAssets
                        .Where(a => !string.IsNullOrEmpty(a.Isin))
                        .GroupBy(a => a.Isin, StringComparer.OrdinalIgnoreCase)
                        .ToDictionary(g => g.Key, g => g.First(), StringComparer.OrdinalIgnoreCase);

                    var parsedEvents = rawEvents.Select(e =>
                    {
                        string eventIsin = e.Isin ?? string.Empty;
                        string ticker = e.Ticker ?? string.Empty;
                        string companyName = e.CompanyName ?? string.Empty;
                        string eventType = e.EventType ?? string.Empty;
                        DateTime eventDate = e.Date;

                        string image = $"/api/v1/logo/{eventIsin}";
                        if (!string.IsNullOrEmpty(eventIsin) && isinLookup.TryGetValue(eventIsin, out var matchedAsset))
                        {
                            if (!string.IsNullOrWhiteSpace(matchedAsset.Name))
                            {
                                companyName = matchedAsset.Name;
                            }

                            if (!string.IsNullOrWhiteSpace(matchedAsset.Image))
                            {
                                image = matchedAsset.Image;
                            }
                        }

                        return new CalendarEventResponseDto(
                            Id: $"evt-{eventIsin}-{eventDate:yyyyMMdd}-{eventType}",
                            Symbol: string.IsNullOrWhiteSpace(ticker) ? eventIsin : ticker,
                            CompanyName: companyName,
                            EventType: eventType,
                            EventDate: eventDate,
                            Date: eventDate.ToString("o"),
                            Isin: eventIsin,
                            Ticker: ticker,
                            Description: $"{eventType} - {companyName}",
                            Details: $"Termin für {companyName} am {eventDate:dd.MM.yyyy}",
                            Image: image
                        );
                    });

                    // Optionales Filtern
                    var filtered = parsedEvents;

                    if (!string.IsNullOrWhiteSpace(category) &&
                        !string.Equals(category, "Alle", StringComparison.OrdinalIgnoreCase) &&
                        !string.Equals(category, "all", StringComparison.OrdinalIgnoreCase))
                    {
                        filtered = filtered.Where(e =>
                            string.Equals(e.EventType, category, StringComparison.OrdinalIgnoreCase));
                    }

                    if (date.HasValue)
                    {
                        filtered = filtered.Where(e => e.EventDate.Date == date.Value.Date);
                    }

                    if (!string.IsNullOrWhiteSpace(activeSymbol))
                    {
                        filtered = filtered.Where(e =>
                            string.Equals(e.Isin, activeSymbol, StringComparison.OrdinalIgnoreCase) ||
                            string.Equals(e.Ticker, activeSymbol, StringComparison.OrdinalIgnoreCase) ||
                            string.Equals(e.Symbol, activeSymbol, StringComparison.OrdinalIgnoreCase)
                        );
                    }

                    return Ok(filtered.OrderBy(e => e.EventDate).ToList());
                }
            }
            else
            {
                _logger.LogWarning("[CalendarController] MQTT client is NOT connected to broker.");
            }
        }
        catch (Exception ex)
        {
            _logger.LogWarning(ex, "[CalendarController] Failed to retrieve corporate events via MQTT RPC.");
        }

        return Ok(new List<CalendarEventResponseDto>());
    }
}