using System.Text.Json;
using Microsoft.AspNetCore.Mvc;
using PlanTempus.Application.Features.Localization.Services;

namespace PlanTempus.Application.Features.Employees.Components;

public class EmployeeDetailHoursViewComponent : ViewComponent
{
    private readonly ILocalizationService _localization;
    private readonly IWebHostEnvironment _environment;

    public EmployeeDetailHoursViewComponent(ILocalizationService localization, IWebHostEnvironment environment)
    {
        _localization = localization;
        _environment = environment;
    }

    public IViewComponentResult Invoke(string key)
    {
        var weekSchedule = LoadMockData();
        var employee = weekSchedule.Employees.FirstOrDefault(e => e.EmployeeId == key);
        var weeks = GenerateWeeks(weekSchedule, employee);

        var model = new EmployeeDetailHoursViewModel
        {
            EmployeeId = key,
            Weeks = weeks,
            DayNames = new[] { "Mandag", "Tirsdag", "Onsdag", "Torsdag", "Fredag", "Lørdag", "Søndag" },
            LabelHours = _localization.Get("employees.detail.hours.label")
        };

        return View(model);
    }

    private WeekScheduleData LoadMockData()
    {
        var jsonPath = Path.Combine(_environment.ContentRootPath, "Features", "Employees", "Data", "workScheduleMock.json");
        var json = System.IO.File.ReadAllText(jsonPath);
        return JsonSerializer.Deserialize<WeekScheduleData>(json, new JsonSerializerOptions
        {
            PropertyNameCaseInsensitive = true
        })!;
    }

    private List<WeekHoursData> GenerateWeeks(WeekScheduleData weekSchedule, EmployeeScheduleData? employee)
    {
        var weeks = new List<WeekHoursData>();
        var startDate = DateTime.Parse(weekSchedule.StartDate);

        // Generate 6 weeks of data (current week + 5 more)
        for (int w = 0; w < 6; w++)
        {
            var weekStart = startDate.AddDays(w * 7);
            var weekNumber = GetWeekNumber(weekStart);
            var days = new List<DayHoursData>();
            var totalMinutes = 0;

            for (int d = 0; d < 7; d++)
            {
                var date = weekStart.AddDays(d);
                var dateKey = date.ToString("yyyy-MM-dd");
                var shift = employee?.Schedule.GetValueOrDefault(dateKey);

                string status = "off";
                string display = "—";

                if (shift != null)
                {
                    status = shift.Status;
                    if (shift.Status == "work" && shift.Start != null && shift.End != null)
                    {
                        display = $"{shift.Start} - {shift.End}";
                        totalMinutes += CalculateMinutes(shift.Start, shift.End);
                    }
                    else if (shift.Status == "vacation")
                    {
                        display = "Ferie";
                    }
                    else if (shift.Status == "sick")
                    {
                        display = "Syg";
                    }
                }

                days.Add(new DayHoursData
                {
                    Date = dateKey,
                    Status = status,
                    Display = display
                });
            }

            weeks.Add(new WeekHoursData
            {
                WeekNumber = weekNumber,
                TotalHours = totalMinutes / 60,
                Days = days
            });
        }

        return weeks;
    }

    private int GetWeekNumber(DateTime date)
    {
        var cal = System.Globalization.CultureInfo.CurrentCulture.Calendar;
        return cal.GetWeekOfYear(date, System.Globalization.CalendarWeekRule.FirstFourDayWeek, DayOfWeek.Monday);
    }

    private int CalculateMinutes(string start, string end)
    {
        var startTime = TimeSpan.Parse(start);
        var endTime = TimeSpan.Parse(end);
        return (int)(endTime - startTime).TotalMinutes;
    }
}

public class EmployeeDetailHoursViewModel
{
    public required string EmployeeId { get; init; }
    public required List<WeekHoursData> Weeks { get; init; }
    public required string[] DayNames { get; init; }
    public required string LabelHours { get; init; }
}

public class WeekHoursData
{
    public int WeekNumber { get; init; }
    public int TotalHours { get; init; }
    public required List<DayHoursData> Days { get; init; }
}

public class DayHoursData
{
    public required string Date { get; init; }
    public required string Status { get; init; }
    public required string Display { get; init; }
}