using Microsoft.AspNetCore.Mvc;
using PlanTempus.Application.Features.Localization.Services;

namespace PlanTempus.Application.Features.Customers.Components;

public class CustomerDetailStatisticsViewComponent : ViewComponent
{
    private readonly ILocalizationService _localization;

    public CustomerDetailStatisticsViewComponent(ILocalizationService localization)
    {
        _localization = localization;
    }

    public IViewComponentResult Invoke(string customerId)
    {
        var customer = CustomerDetailCatalog.Get(customerId);
        var stats = customer.Statistics;

        // Calculate widths for the attendance bar
        var total = stats.Attendance.Attended + stats.Attendance.Cancelled + stats.Attendance.NoShow;

        string attendedWidth, cancelledWidth, noShowWidth;
        bool allZero = total == 0;

        if (allZero)
        {
            // All zero: gray bar with equal segments
            attendedWidth = "33.33%";
            cancelledWidth = "33.33%";
            noShowWidth = "33.34%";
        }
        else
        {
            // Calculate percentages, but use 12px minimum for zero values
            var attendedPercent = stats.Attendance.Attended * 100 / total;
            var cancelledPercent = stats.Attendance.Cancelled * 100 / total;
            var noShowPercent = stats.Attendance.NoShow * 100 / total;

            attendedWidth = stats.Attendance.Attended == 0 ? "12px" : $"{attendedPercent}%";
            cancelledWidth = stats.Attendance.Cancelled == 0 ? "12px" : $"{cancelledPercent}%";
            noShowWidth = stats.Attendance.NoShow == 0 ? "12px" : $"{noShowPercent}%";
        }

        var model = new CustomerDetailStatisticsViewModel
        {
            // Attendance
            AttendanceTitle = "Fremmøde & Pålidelighed",
            Attended = stats.Attendance.Attended,
            AttendedLabel = "Fremmøder",
            Cancelled = stats.Attendance.Cancelled,
            CancelledLabel = "Aflysninger",
            NoShow = stats.Attendance.NoShow,
            NoShowLabel = "No-shows",
            ReliabilityPercent = stats.Attendance.ReliabilityPercent,
            ReliabilityLabel = "Pålidelighed",
            AttendedWidth = attendedWidth,
            CancelledWidth = cancelledWidth,
            NoShowWidth = noShowWidth,
            AllZero = allZero,

            // Service patterns
            ServicePatternsTitle = "Service-mønstre",
            TopServicesLabel = "Top 3 Services",
            TopServices = stats.TopServices.Select((s, i) => new TopItemViewModel
            {
                Rank = i + 1,
                Name = s.Name,
                Count = s.Count
            }).ToList(),
            TopProductsLabel = "Top 3 Produkter",
            TopProducts = stats.TopProducts.Select((p, i) => new TopItemViewModel
            {
                Rank = i + 1,
                Name = p.Name,
                Count = p.Count
            }).ToList(),

            // Booking behavior
            BookingBehaviorTitle = "Booking-adfærd",
            AvgBookingNotice = $"{stats.BookingBehavior.AvgBookingNoticeDays} dage",
            AvgBookingNoticeLabel = "Gns. bookingvarsel",
            PreferredDay = stats.BookingBehavior.PreferredDay,
            PreferredDayLabel = "Foretrukken dag",
            PreferredTimeSlot = stats.BookingBehavior.PreferredTimeSlot,
            PreferredTimeSlotLabel = "Foretrukken tid",
            OnlineBookingRate = $"{stats.BookingBehavior.OnlineBookingRate}%",
            OnlineBookingRateLabel = "Online booking rate",
            AvgCancellationNotice = $"{stats.BookingBehavior.AvgCancellationNoticeDays} dage",
            AvgCancellationNoticeLabel = "Gns. aflysningsvarsel",

            // Loyalty
            LoyaltyTitle = "Loyalitet",
            CustomerSinceYears = $"{stats.Loyalty.CustomerSinceYears:0.0} ar".Replace(".", ","),
            CustomerSinceYearsLabel = "Kunde siden",
            DaysSinceLastVisit = stats.Loyalty.DaysSinceLastVisit,
            DaysSinceLastVisitLabel = "Dage siden sidst",
            ChurnRisk = stats.Loyalty.ChurnRisk,
            ChurnRiskLabel = "Churn-risiko",
            AvgIntervalDays = $"{stats.Loyalty.AvgIntervalDays} dage",
            AvgIntervalDaysLabel = "Gns. interval"
        };

        return View(model);
    }
}

public class CustomerDetailStatisticsViewModel
{
    // Attendance
    public required string AttendanceTitle { get; init; }
    public int Attended { get; init; }
    public required string AttendedLabel { get; init; }
    public int Cancelled { get; init; }
    public required string CancelledLabel { get; init; }
    public int NoShow { get; init; }
    public required string NoShowLabel { get; init; }
    public int ReliabilityPercent { get; init; }
    public required string ReliabilityLabel { get; init; }
    public required string AttendedWidth { get; init; }
    public required string CancelledWidth { get; init; }
    public required string NoShowWidth { get; init; }
    public bool AllZero { get; init; }

    // Service patterns
    public required string ServicePatternsTitle { get; init; }
    public required string TopServicesLabel { get; init; }
    public List<TopItemViewModel> TopServices { get; init; } = new();
    public required string TopProductsLabel { get; init; }
    public List<TopItemViewModel> TopProducts { get; init; } = new();

    // Booking behavior
    public required string BookingBehaviorTitle { get; init; }
    public required string AvgBookingNotice { get; init; }
    public required string AvgBookingNoticeLabel { get; init; }
    public required string PreferredDay { get; init; }
    public required string PreferredDayLabel { get; init; }
    public required string PreferredTimeSlot { get; init; }
    public required string PreferredTimeSlotLabel { get; init; }
    public required string OnlineBookingRate { get; init; }
    public required string OnlineBookingRateLabel { get; init; }
    public required string AvgCancellationNotice { get; init; }
    public required string AvgCancellationNoticeLabel { get; init; }

    // Loyalty
    public required string LoyaltyTitle { get; init; }
    public required string CustomerSinceYears { get; init; }
    public required string CustomerSinceYearsLabel { get; init; }
    public int DaysSinceLastVisit { get; init; }
    public required string DaysSinceLastVisitLabel { get; init; }
    public required string ChurnRisk { get; init; }
    public required string ChurnRiskLabel { get; init; }
    public required string AvgIntervalDays { get; init; }
    public required string AvgIntervalDaysLabel { get; init; }
}

public class TopItemViewModel
{
    public int Rank { get; init; }
    public required string Name { get; init; }
    public int Count { get; init; }
}