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using System ;
using System.Collections.Generic ;
using static PKHeX . Core . Species ;
namespace PKHeX.Core
{
/// <summary>
/// Contains logic that calculates the evolution chain of a <see cref="PKM"/>, only considering the generation it originated in.
/// </summary>
public static class EncounterOrigin
{
/// <summary>
/// Gets possible evolution details for the input <see cref="pkm"/>
/// </summary>
/// <param name="pkm">Current state of the Pokémon</param>
/// <returns>Possible origin species-form-levels to match against encounter data.</returns>
/// <remarks>Use <see cref="GetOriginChain12"/> if the <see cref="pkm"/> originated from Generation 1 or 2.</remarks>
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public static EvoCriteria [ ] GetOriginChain ( PKM pkm )
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{
bool hasOriginMet = pkm . HasOriginalMetLocation ;
var maxLevel = GetLevelOriginMax ( pkm , hasOriginMet ) ;
var minLevel = GetLevelOriginMin ( pkm , hasOriginMet ) ;
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return GetOriginChain ( pkm , - 1 , ( byte ) maxLevel , ( byte ) minLevel , hasOriginMet ) ;
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}
/// <summary>
/// Gets possible evolution details for the input <see cref="pkm"/> originating from Generation 1 or 2.
/// </summary>
/// <param name="pkm">Current state of the Pokémon</param>
/// <param name="gameSource">Game/group the <see cref="pkm"/> originated from. If <see cref="GameVersion.RBY"/>, it assumes Gen 1, otherwise Gen 2.</param>
/// <returns>Possible origin species-form-levels to match against encounter data.</returns>
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public static EvoCriteria [ ] GetOriginChain12 ( PKM pkm , GameVersion gameSource )
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{
bool rby = gameSource = = GameVersion . RBY ;
var maxSpecies = rby ? Legal . MaxSpeciesID_1 : Legal . MaxSpeciesID_2 ;
bool hasOriginMet ;
int maxLevel , minLevel ;
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if ( pkm is ICaughtData2 pk2 )
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{
hasOriginMet = pk2 . CaughtData ! = 0 ;
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maxLevel = rby & & Future_LevelUp2 . Contains ( pkm . Species ) ? pkm . CurrentLevel - 1 : pkm . CurrentLevel ;
minLevel = ! hasOriginMet ? 2 : pkm . IsEgg ? 5 : pk2 . Met_Level ;
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}
else if ( pkm is PK1 pk1 )
{
hasOriginMet = false ;
maxLevel = pk1 . CurrentLevel ;
minLevel = 2 ;
}
else if ( rby )
{
hasOriginMet = false ;
maxLevel = Future_LevelUp2 . Contains ( pkm . Species ) ? pkm . CurrentLevel - 1 : GetLevelOriginMaxTransfer ( pkm , pkm . Met_Level , 1 ) ;
minLevel = 2 ;
}
else // GSC
{
hasOriginMet = false ;
maxLevel = GetLevelOriginMaxTransfer ( pkm , pkm . Met_Level , 2 ) ;
minLevel = 2 ;
}
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return GetOriginChain ( pkm , maxSpecies , ( byte ) maxLevel , ( byte ) minLevel , hasOriginMet ) ;
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}
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private static EvoCriteria [ ] GetOriginChain ( PKM pkm , int maxSpecies , byte maxLevel , byte minLevel , bool hasOriginMet )
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{
if ( maxLevel < minLevel )
return Array . Empty < EvoCriteria > ( ) ;
if ( hasOriginMet )
return EvolutionChain . GetValidPreEvolutions ( pkm , maxSpecies , maxLevel , minLevel ) ;
// Permit the maximum to be all the way up to Current Level; we'll trim these impossible evolutions out later.
var tempMax = pkm . CurrentLevel ;
var chain = EvolutionChain . GetValidPreEvolutions ( pkm , maxSpecies , tempMax , minLevel ) ;
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for ( var i = 0 ; i < chain . Length ; i + + )
chain [ i ] = chain [ i ] with { LevelMax = maxLevel , LevelMin = minLevel } ;
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return chain ;
}
private static int GetLevelOriginMin ( PKM pkm , bool hasMet )
{
if ( pkm . Format = = 3 )
{
if ( pkm . IsEgg )
return 5 ;
return Math . Max ( 2 , pkm . Met_Level ) ;
}
if ( ! hasMet )
return 1 ;
return Math . Max ( 1 , pkm . Met_Level ) ;
}
private static int GetLevelOriginMax ( PKM pkm , bool hasMet )
{
var met = pkm . Met_Level ;
if ( hasMet )
return pkm . CurrentLevel ;
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int generation = pkm . Generation ;
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if ( generation > = 4 )
return met ;
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var downLevel = GetLevelOriginMaxTransfer ( pkm , pkm . CurrentLevel , generation ) ;
return Math . Min ( met , downLevel ) ;
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}
private static int GetLevelOriginMaxTransfer ( PKM pkm , int met , int generation )
{
var species = pkm . Species ;
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if ( Future_LevelUp . TryGetValue ( species | ( pkm . Form < < 11 ) , out var delta ) )
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return met - delta ;
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if ( generation < 4 & & Future_LevelUp4 . Contains ( species ) & & ( pkm . Format < = 7 | | ! Future_LevelUp4_Not8 . Contains ( species ) ) )
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return met - 1 ;
return met ;
}
/// <summary>
/// Species introduced in Generation 2 that require a level up to evolve into from a specimen that originated in a previous generation.
/// </summary>
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private static readonly HashSet < int > Future_LevelUp2 = new ( )
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{
( int ) Crobat ,
( int ) Espeon ,
( int ) Umbreon ,
( int ) Blissey ,
} ;
/// <summary>
/// Species introduced in Generation 4 that require a level up to evolve into from a specimen that originated in a previous generation.
/// </summary>
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private static readonly HashSet < int > Future_LevelUp4 = new ( )
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{
( int ) Ambipom ,
( int ) Weavile ,
( int ) Magnezone ,
( int ) Lickilicky ,
( int ) Tangrowth ,
( int ) Yanmega ,
( int ) Leafeon ,
( int ) Glaceon ,
( int ) Mamoswine ,
( int ) Gliscor ,
( int ) Probopass ,
} ;
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/// <summary>
/// Species introduced in Generation 4 that used to require a level up to evolve prior to Generation 8.
/// </summary>
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private static readonly HashSet < int > Future_LevelUp4_Not8 = new ( )
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{
( int ) Magnezone , // Thunder Stone
( int ) Leafeon , // Leaf Stone
( int ) Glaceon , // Ice Stone
} ;
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/// <summary>
/// Species introduced in Generation 6+ that require a level up to evolve into from a specimen that originated in a previous generation.
/// </summary>
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private static readonly Dictionary < int , int > Future_LevelUp = new ( )
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{
// Gen6
{ ( int ) Sylveon , 1 } ,
// Gen7
{ ( int ) Marowak | ( 1 < < 11 ) , 1 } ,
// Gen8
{ ( int ) Weezing | ( 1 < < 11 ) , 1 } ,
{ ( int ) MrMime | ( 1 < < 11 ) , 1 } ,
{ ( int ) MrRime , 2 } ,
} ;
}
}