using System;
using System.Collections.Generic;
namespace PKHeX.Core
{
///
///
/// encounter area
///
public sealed record EncounterArea1 : EncounterArea
{
public readonly int Rate;
public readonly EncounterSlot1[] Slots;
protected override IReadOnlyList Raw => Slots;
public static EncounterArea1[] GetAreas(BinLinkerAccessor input, GameVersion game)
{
var result = new EncounterArea1[input.Length];
for (int i = 0; i < result.Length; i++)
result[i] = new EncounterArea1(input[i], game);
return result;
}
private EncounterArea1(ReadOnlySpan data, GameVersion game) : base(game)
{
Location = data[0];
// 1 byte unused
Type = (SlotType)data[2];
Rate = data[3];
var next = data[4..];
int count = next.Length / 4;
var slots = new EncounterSlot1[count];
for (int i = 0; i < slots.Length; i++)
{
const int size = 4;
var entry = next.Slice(i * size, size);
byte max = entry[3];
byte min = entry[2];
byte slotNum = entry[1];
byte species = entry[0];
slots[i] = new EncounterSlot1(this, species, min, max, slotNum);
}
Slots = slots;
}
public override IEnumerable GetMatchingSlots(PKM pkm, IReadOnlyList chain)
{
int rate = pkm is PK1 pk1 ? pk1.Catch_Rate : -1;
foreach (var slot in Slots)
{
foreach (var evo in chain)
{
if (slot.Species != evo.Species)
continue;
if (slot.LevelMin > evo.Level)
break;
if (slot.Form != evo.Form)
break;
if (rate != -1)
{
var expect = (slot.Version == GameVersion.YW ? PersonalTable.Y : PersonalTable.RB)[slot.Species].CatchRate;
if (expect != rate && !(ParseSettings.AllowGen1Tradeback && GBRestrictions.IsTradebackCatchRate(rate)))
break;
}
yield return slot;
break;
}
}
}
}
}