using System;
using static System.Buffers.Binary.BinaryPrimitives;

namespace PKHeX.Core;

public sealed class PlayTime6 : SaveBlock<SaveFile>
{
    public PlayTime6(SAV6 sav, int offset) : base(sav) => Offset = offset;
    public PlayTime6(SAV7 sav, int offset) : base(sav) => Offset = offset;

    public int PlayedHours
    {
        get => ReadUInt16LittleEndian(Data.AsSpan(Offset));
        set => WriteUInt16LittleEndian(Data.AsSpan(Offset), (ushort)value);
    }

    public int PlayedMinutes
    {
        get => Data[Offset + 2];
        set => Data[Offset + 2] = (byte)value;
    }

    public int PlayedSeconds
    {
        get => Data[Offset + 3];
        set => Data[Offset + 3] = (byte)value;
    }

    private uint LastSaved { get => ReadUInt32LittleEndian(Data.AsSpan(Offset + 0x4)); set => WriteUInt32LittleEndian(Data.AsSpan(Offset + 0x4), value); }
    private int LastSavedYear { get => (int)(LastSaved & 0xFFF); set => LastSaved = (LastSaved & 0xFFFFF000) | (uint)value; }
    private int LastSavedMonth { get => (int)((LastSaved >> 12) & 0xF); set => LastSaved = (LastSaved & 0xFFFF0FFF) | (((uint)value & 0xF) << 12); }
    private int LastSavedDay { get => (int)((LastSaved >> 16) & 0x1F); set => LastSaved = (LastSaved & 0xFFE0FFFF) | (((uint)value & 0x1F) << 16); }
    private int LastSavedHour { get => (int)((LastSaved >> 21) & 0x1F); set => LastSaved = (LastSaved & 0xFC1FFFFF) | (((uint)value & 0x1F) << 21); }
    private int LastSavedMinute { get => (int)((LastSaved >> 26) & 0x3F); set => LastSaved = (LastSaved & 0x03FFFFFF) | (((uint)value & 0x3F) << 26); }
    public string LastSavedTime => $"{LastSavedYear:0000}-{LastSavedMonth:00}-{LastSavedDay:00} {LastSavedHour:00}ː{LastSavedMinute:00}"; // not :

    public DateTime? LastSavedDate
    {
        get => !DateUtil.IsDateValid(LastSavedYear, LastSavedMonth, LastSavedDay)
            ? null
            : new DateTime(LastSavedYear, LastSavedMonth, LastSavedDay, LastSavedHour, LastSavedMinute, 0);
        set
        {
            // Only update the properties if a value is provided.
            if (value.HasValue)
            {
                var dt = value.Value;
                LastSavedYear = dt.Year;
                LastSavedMonth = dt.Month;
                LastSavedDay = dt.Day;
                LastSavedHour = dt.Hour;
                LastSavedMinute = dt.Minute;
            }
            else // Clear the date.
            {
                // If code tries to access MetDate again, null will be returned.
                LastSavedYear = 0;
                LastSavedMonth = 0;
                LastSavedDay = 0;
                LastSavedHour = 0;
                LastSavedMinute = 0;
            }
        }
    }
}