using System;
using System.Collections.Generic;
using static System.Buffers.Binary.BinaryPrimitives;
namespace PKHeX.Core
{
///
///
/// encounter area
///
public sealed record EncounterArea5 : EncounterArea
{
public readonly EncounterSlot5[] Slots;
protected override IReadOnlyList Raw => Slots;
public static EncounterArea5[] GetAreas(BinLinkerAccessor input, GameVersion game)
{
var result = new EncounterArea5[input.Length];
for (int i = 0; i < result.Length; i++)
result[i] = new EncounterArea5(input[i], game);
return result;
}
private EncounterArea5(ReadOnlySpan data, GameVersion game) : base(game)
{
Location = ReadUInt16LittleEndian(data);
Type = (SlotType)data[2];
Slots = ReadSlots(data);
}
private EncounterSlot5[] ReadSlots(ReadOnlySpan data)
{
const int size = 4;
int count = (data.Length - 4) / size;
var slots = new EncounterSlot5[count];
for (int i = 0; i < slots.Length; i++)
{
int offset = 4 + (size * i);
var entry = data.Slice(offset, size);
slots[i] = ReadSlot(entry);
}
return slots;
}
private EncounterSlot5 ReadSlot(ReadOnlySpan entry)
{
ushort species = ReadUInt16LittleEndian(entry);
byte form = (byte)(species >> 11);
species &= 0x3FF;
byte min = entry[2];
byte max = entry[3];
return new EncounterSlot5(this, species, form, min, max);
}
public override IEnumerable GetMatchingSlots(PKM pkm, EvoCriteria[] chain)
{
foreach (var slot in Slots)
{
foreach (var evo in chain)
{
if (slot.Species != evo.Species)
continue;
if (!slot.IsLevelWithinRange(pkm.Met_Level))
break;
// Deerling and Sawsbuck can change forms when seasons change, thus can be any of the [0,3] form values.
// no other wild forms can change
if (slot.Form != evo.Form && slot.Species is not ((int)Species.Deerling or (int)Species.Sawsbuck))
break;
yield return slot;
break;
}
}
}
}
}