mirror of
https://github.com/kwsch/PKHeX
synced 2024-11-23 20:43:07 +00:00
267 lines
11 KiB
C#
267 lines
11 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Linq;
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using static PKHeX.Core.Legal;
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namespace PKHeX.Core
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{
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public static class EvolutionChain
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{
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private static readonly List<EvoCriteria> NONE = new(0);
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internal static IReadOnlyList<EvoCriteria>[] GetEvolutionChainsAllGens(PKM pkm, IEncounterTemplate Encounter)
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{
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var CompleteEvoChain = GetEvolutionChain(pkm, Encounter, pkm.Species, pkm.CurrentLevel);
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if (Encounter is EncounterInvalid || pkm.IsEgg || CompleteEvoChain.Count == 0)
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return GetChainSingle(pkm, CompleteEvoChain);
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return GetChainAll(pkm, Encounter, CompleteEvoChain);
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}
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private static List<EvoCriteria>[] GetChainBase(int maxgen)
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{
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var GensEvoChains = new List<EvoCriteria>[maxgen + 1];
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for (int i = 0; i <= maxgen; i++)
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GensEvoChains[i] = NONE; // default no-evolutions
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return GensEvoChains;
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}
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private static List<EvoCriteria>[] GetChainSingle(PKM pkm, List<EvoCriteria> CompleteEvoChain)
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{
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var chain = GetChainBase(Math.Max(2, pkm.Format));
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chain[pkm.Format] = CompleteEvoChain;
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return chain;
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}
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private static List<EvoCriteria>[] GetChainAll(PKM pkm, IEncounterTemplate enc, IReadOnlyList<EvoCriteria> CompleteEvoChain)
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{
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int maxgen = pkm is PK1 {Gen1_NotTradeback: false} ? 2 : pkm.Format;
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var GensEvoChains = GetChainBase(maxgen);
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var queue = new Queue<EvoCriteria>(CompleteEvoChain);
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var mostEvolved = queue.Dequeue();
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int lvl = pkm.CurrentLevel;
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int maxLevel = lvl;
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int pkGen = enc.Generation;
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// Iterate generations backwards
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// Maximum level of an earlier generation (GenX) will never be greater than a later generation (GenX+Y).
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int mingen = pkGen >= 3 ? pkGen : pkm.Gen2_NotTradeback ? 2 : 1;
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bool noxfrDecremented = true;
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for (int g = GensEvoChains.Length - 1; g >= mingen; g--)
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{
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if (pkGen <= 2 && g == 6)
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g = 2;
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if (g <= 4 && pkm.Format > 2 && pkm.Format > g && !pkm.HasOriginalMetLocation && lvl > pkm.Met_Level)
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{
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// Met location was lost at this point but it also means the pokemon existed in generations 1 to 4 with maximum level equals to met level
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lvl = pkm.Met_Level;
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}
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int maxspeciesgen = g == 2 && pkm.VC1 ? MaxSpeciesID_1 : GetMaxSpeciesOrigin(g);
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// Remove future gen evolutions after a few special considerations:
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// If the pokemon origin is illegal (e.g. Gen3 Infernape) the list will be emptied -- species lineage did not exist at any evolution stage.
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while (mostEvolved.Species > maxspeciesgen)
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{
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if (queue.Count == 0)
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{
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if (g <= 2 && pkm.VC1)
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GensEvoChains[pkm.Format] = NONE; // invalidate here since we haven't reached the regular invalidation
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return GensEvoChains;
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}
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if (mostEvolved.RequiresLvlUp)
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{
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// This is a Gen3 pokemon in a Gen4 phase evolution that requires level up and then transferred to Gen5+
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// We can deduce that it existed in Gen4 until met level,
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// but if current level is met level we can also deduce it existed in Gen3 until maximum met level -1
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if (g == 3 && pkm.Format > 4 && lvl == maxLevel)
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lvl--;
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// The same condition for Gen2 evolution of Gen1 pokemon, level of the pokemon in Gen1 games would be CurrentLevel -1 one level below Gen2 level
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else if (g == 1 && pkm.Format == 2 && lvl == maxLevel)
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lvl--;
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}
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mostEvolved = queue.Dequeue();
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}
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// Alolan form evolutions, remove from gens 1-6 chains
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if (EvolveToAlolanForms.Contains(mostEvolved.Species))
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{
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if (g < 7 && pkm.Format >= 7 && mostEvolved.Form > 0)
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{
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if (queue.Count == 0)
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break;
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mostEvolved = queue.Dequeue();
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}
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}
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GensEvoChains[g] = GetEvolutionChain(pkm, enc, mostEvolved.Species, lvl);
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if (GensEvoChains[g].Count == 0)
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continue;
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if (g > 2 && !pkm.HasOriginalMetLocation && g >= pkGen && noxfrDecremented)
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{
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bool isTransferred = HasMetLocationUpdatedTransfer(pkGen, g);
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if (!isTransferred)
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continue;
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noxfrDecremented = g > (pkGen != 3 ? 4 : 5);
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// Remove previous evolutions below transfer level
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// For example a gen3 Charizard in format 7 with current level 36 and met level 36, thus could never be Charmander / Charmeleon in Gen5+.
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// chain level for Charmander is 35, is below met level.
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int minlvl = GetMinLevelGeneration(pkm, g);
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GensEvoChains[g].RemoveAll(e => e.Level < minlvl);
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}
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else if (g == 1)
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{
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// Remove Gen2 post-evolutions (Scizor, Blissey...)
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if (GensEvoChains[1][0].Species > MaxSpeciesID_1)
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GensEvoChains[1].RemoveAt(0);
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// Remove Gen2 pre-evolutions (Pichu, Cleffa...)
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int lastIndex = GensEvoChains[1].Count - 1;
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if (lastIndex >= 0 && GensEvoChains[1][lastIndex].Species > MaxSpeciesID_1)
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GensEvoChains[1].RemoveAt(lastIndex);
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// Remove Gen7 pre-evolutions and chain break scenarios
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if (pkm.VC1)
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TrimVC1Transfer(pkm, GensEvoChains);
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}
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}
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return GensEvoChains;
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}
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private static bool HasMetLocationUpdatedTransfer(int originalGeneration, int currentGeneration) => originalGeneration switch
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{
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< 3 => currentGeneration >= 3,
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<= 4 => currentGeneration != originalGeneration,
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_ => false
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};
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private static void TrimVC1Transfer(PKM pkm, IList<List<EvoCriteria>> GensEvoChains)
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{
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if (GensEvoChains[7].All(z => z.Species > MaxSpeciesID_1))
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GensEvoChains[pkm.Format] = NONE; // needed a Gen1 species present; invalidate the chain.
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}
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internal static int GetEvoChainSpeciesIndex(IReadOnlyList<EvoCriteria> chain, int species)
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{
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for (int i = 0; i < chain.Count; i++)
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{
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if (chain[i].Species == species)
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return i;
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}
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return -1;
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}
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private static List<EvoCriteria> GetEvolutionChain(PKM pkm, IEncounterTemplate Encounter, int maxspec, int maxlevel)
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{
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var chain = GetValidPreEvolutions(pkm, minLevel: Encounter.LevelMin);
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if (Encounter.Species == maxspec)
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{
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if (chain.Count != 1)
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{
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chain.RemoveAll(z => z.Species != Encounter.Species);
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chain[0].MinLevel = Encounter.LevelMin;
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}
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return chain;
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}
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// Evolution chain is in reverse order (devolution)
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// Find the index of the minimum species to determine the end of the chain
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int minindex = GetEvoChainSpeciesIndex(chain, Encounter.Species);
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bool last = minindex < 0 || minindex == chain.Count - 1;
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// If we remove a pre-evolution, update the chain if appropriate.
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if (!last)
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{
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// Remove chain species after the encounter
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int count = chain.Count;
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for (int i = minindex + 1; i < count; i++)
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chain.RemoveAt(i);
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if (chain.Count == 0)
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return chain; // no species left in chain
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CheckLastEncounterRemoval(Encounter, chain);
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}
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// maxspec is used to remove future geneneration evolutions, to gather evolution chain of a pokemon in previous generations
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int skip = Math.Max(0, GetEvoChainSpeciesIndex(chain, maxspec));
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for (int i = 0; i < skip; i++)
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chain.RemoveAt(0);
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// Gen3->4 and Gen4->5 transfer sets the Met Level property to the Pokémon's current level.
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// Removes evolutions impossible before the transfer level.
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// For example a FireRed Charizard with a current level (in XY) is 50 but Met Level is 20; it couldn't be a Charizard in Gen3 and Gen4 games
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chain.RemoveAll(e => e.MinLevel > maxlevel);
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// Reduce the evolution chain levels to max level to limit any later analysis/results.
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foreach (var d in chain)
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d.Level = Math.Min(d.Level, maxlevel);
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return chain;
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}
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private static void CheckLastEncounterRemoval(IEncounterTemplate enc, IReadOnlyList<EvoCriteria> chain)
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{
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// Last entry from chain is removed, turn next entry into the encountered Pokémon
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var last = chain[^1];
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last.MinLevel = enc.LevelMin;
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last.RequiresLvlUp = false;
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var first = chain[0];
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if (first.RequiresLvlUp)
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return;
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if (first.MinLevel == 2)
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{
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// Example: Raichu in Gen2 or later
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// Because Pichu requires a level up, the minimum level of the resulting Raichu must be be >2
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// But after removing Pichu (because the origin species is Pikachu), the Raichu minimum level should be 1.
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first.MinLevel = 1;
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first.RequiresLvlUp = false;
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}
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else // in-game trade or evolution stone can evolve immediately
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{
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first.MinLevel = last.MinLevel;
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}
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}
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internal static List<EvoCriteria> GetValidPreEvolutions(PKM pkm, int maxspeciesorigin = -1, int maxLevel = -1, int minLevel = 1, bool skipChecks = false)
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{
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if (maxLevel < 0)
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maxLevel = pkm.CurrentLevel;
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if (maxspeciesorigin == -1 && pkm.InhabitedGeneration(2) && pkm.Format <= 2 && pkm.Generation == 1)
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maxspeciesorigin = MaxSpeciesID_2;
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int tree = Math.Max(2, pkm.Format);
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var et = EvolutionTree.GetEvolutionTree(pkm, tree);
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return et.GetValidPreEvolutions(pkm, maxLevel: maxLevel, maxSpeciesOrigin: maxspeciesorigin, skipChecks: skipChecks, minLevel: minLevel);
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}
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private static int GetMinLevelGeneration(PKM pkm, int generation)
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{
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if (!pkm.InhabitedGeneration(generation))
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return 0;
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if (pkm.Format <= 2)
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return 2;
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var origin = pkm.Generation;
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if (!pkm.HasOriginalMetLocation && generation != origin)
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return pkm.Met_Level;
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// gen 3 and prior can't obtain anything at level 1
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if (origin <= 3)
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return 2;
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return 1;
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}
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}
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}
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