using Unosquare.DateTimeExt;

// DateTime Extensions
var date = new DateTime(2025, 6, 15);
Console.WriteLine(date.ToFormattedString()); // "June 15, 2025"
Console.WriteLine(date.GetQuarter()); // 2
Console.WriteLine(date.IsWeekend()); // false
Console.WriteLine(date.GetBusinessDays(new DateTime(2025, 6, 20))); // 4

// Date Ranges
var range = new DateRange(new DateTime(2025, 1, 1), new DateTime(2025, 1, 31));
Console.WriteLine(range.DaysInBetween); // 30
Console.WriteLine(range.Contains(new DateTime(2025, 1, 15))); // true

// Time Periods
var yearMonth = new YearMonth(6, 2025); // June 2025
var quarter = new YearQuarter(2, 2025); // Q2 2025
var yearToDate = YearToDate.Current;

// Business Logic
Console.WriteLine(date.GetFirstBusinessDayOfMonth()); // First business day of June 2025
Console.WriteLine(date.GetLastBusinessDayOfMonth()); // Last business day of June 2025

var date = new DateTime(2025, 3, 15);

// Formatting and conversion
date.ToFormattedString(); // "March 15, 2025"
date.ToUtc("Eastern Standard Time"); // Convert to UTC
"2025-03-15".ToDateOrNull(); // Safe string parsing

// Business day operations
date.GetFirstBusinessDayOfMonth(); // First weekday of March
date.GetLastBusinessDayOfMonth(); // Last weekday of March  
date.GetNextBusinessDay(); // Next business day after current date
date.GetBusinessDays(new DateTime(2025, 3, 20)); // Count business days in range

// Date calculations
date.GetFirstDayOfMonth(); // March 1, 2025
date.GetLastDayOfMonth(); // March 31, 2025
date.GetQuarter(); // 1 (Q1)
date.GetWeekOfYear(); // Week number in year
date.IsWeekend(); // false (it's a Saturday)
date.ToMidnight(); // 11:59:59 PM of the same day

// Create date ranges
var range = new DateRange(new DateTime(2025, 1, 1), new DateTime(2025, 1, 31));

// Range properties
Console.WriteLine(range.DaysInBetween); // 30
Console.WriteLine(range.FirstBusinessDay); // First business day in range
Console.WriteLine(range.LastBusinessDay); // Last business day in range

// Range operations
range.Contains(new DateTime(2025, 1, 15)); // true
range.ToDateRangeString(); // "1/1/2025 - 1/31/2025"

// Enumerate dates
foreach (var day in range)
{
    Console.WriteLine(day.ToShortDateString());
}

// Working with DateOnly (no time component)
var dateOnlyRange = new DateOnlyRange(new DateOnly(2025, 1, 1), new DateOnly(2025, 1, 31));

// Open ranges (no end date)
var openRange = new OpenDateRange(DateTime.Today); // From today onwards

// Year-Month operations
var yearMonth = new YearMonth(3, 2025); // March 2025
var nextMonth = yearMonth.Next(); // April 2025
var previousMonth = yearMonth.Previous(); // February 2025
var specificDay = yearMonth.Day(15); // March 15, 2025

// Quarterly operations
var quarter = new YearQuarter(1, 2025); // Q1 2025
Console.WriteLine(quarter.Months); // [1, 2, 3] (Jan, Feb, Mar)
var nextQuarter = quarter.Next(); // Q2 2025

// Weekly operations (Standard and ISO)
var week = new YearWeek(10, 2025); // Week 10 of 2025
var isoWeek = new YearWeekIso(10, 2025); // ISO week 10 of 2025

// Year operations
var year = new YearEntity(2025);
Console.WriteLine(year.Months.Count); // 12
Console.WriteLine(year.Quarters.Count); // 4
Console.WriteLine(year.Weeks.Count); // ~52-53

// Current periods
var currentYtd = YearToDate.Current; // Jan 1 to today
var currentMtd = new MonthToDate(); // Month start to today
var ttm = TrailingTwelveMonths.Current; // Last 12 months

// Sample data with year-month information
var data = new List<SalesRecord>
{
    new() { Year = 2025, Month = 1, Amount = 1000 },
    new() { Year = 2025, Month = 1, Amount = 1500 },
    new() { Year = 2025, Month = 2, Amount = 2000 }
};

// Group by month
var monthGrouper = new YearMonthGrouper<SalesRecord>(data);
var monthlyGroups = monthGrouper.GroupByDateRange();
var monthlySummary = monthGrouper.GroupByLabel(x => x.Amount);

// Group by quarter  
var quarterGrouper = new YearQuarterGrouper<SalesRecord>(data);
var quarterlyGroups = quarterGrouper.GroupByDateRange();

public record SalesRecord : IYearMonth
{
    public int Year { get; init; }
    public int Month { get; init; }
    public decimal Amount { get; init; }
}

// Parse date ranges
DateRange.TryParse("2025-01-01 - 2025-01-31", out var range);

// Parse periods
YearMonth.TryParse("2025-03", out var yearMonth);
YearQuarter.TryParse("2025-Q2", out var quarter);
YearWeek.TryParse("2025-W10", out var week);

// Convert to records
var monthRecord = yearMonth.ToRecord(); // YearMonthRecord
var quarterRecord = quarter.ToRecord(); // YearQuarterRecord