using System;

namespace Socer;

// Fixed tactical neighbours in the starting formation. Moving, sprinting and
// substitutions keep the slot's connections; distant lines never gain synergy.
public static class FormationSkillNeighbors
{
    static readonly bool[][] graphs={
        Graph(new[]{(0,2),(0,3),(1,2),(2,3),(3,4),(1,5),(2,6),(3,7),(4,8),
            (5,6),(6,7),(7,8),(5,9),(6,9),(6,10),(7,9),(7,10),(8,10),(9,10)}),
        Graph(new[]{(0,2),(0,3),(1,2),(2,3),(3,4),(1,5),(2,5),(2,6),(3,6),(3,7),(4,7),
            (5,6),(6,7),(5,8),(5,9),(6,9),(7,9),(7,10),(8,9),(9,10)}),
        Graph(new[]{(0,1),(0,2),(0,3),(1,2),(2,3),(1,4),(1,5),(2,5),(2,6),(2,7),(3,7),(3,8),
            (4,5),(5,6),(6,7),(7,8),(4,9),(5,9),(6,9),(6,10),(7,10),(8,10),(9,10)}),
        Graph(new[]{(0,2),(0,3),(1,2),(2,3),(3,4),(1,5),(2,5),(3,6),(4,6),(5,6),
            (5,7),(5,8),(6,8),(6,9),(7,8),(8,9),(7,10),(8,10),(9,10)})
    };
    static bool[] Graph((int First,int Second)[] edges)
    {
        var graph=new bool[121];
        foreach(var edge in edges){graph[edge.First*11+edge.Second]=true;graph[edge.Second*11+edge.First]=true;}
        return graph;
    }
    public static bool AreNeighbors(int formation,int first,int second)=>
        first>=0 && first<11 && second>=0 && second<11 && graphs[Math.Clamp(formation,0,graphs.Length-1)][first*11+second];
    public static bool AreNeighbors(Formation formation,int first,int second)=>AreNeighbors(Array.IndexOf(Formation.All,formation),first,second);
}

public sealed partial class MatchSimulation
{
    readonly int[] skillFormations={0,0};
    // Verification can isolate mutual effects without removing individual skills.
    // Normal matches always keep both sides enabled.
    internal readonly bool[] SkillSynergiesEnabled={true,true};
    public void SetSkillFormation(int team,Formation formation)
    {if(team>=0 && team<skillFormations.Length)skillFormations[team]=Math.Max(0,Array.IndexOf(Formation.All,formation));}
    public bool SkillNeighbors(Footballer first,Footballer second)=>
        first!=null && second!=null && first.Team==second.Team && first.Team>=0 && first.Team<2 &&
        SkillSynergiesEnabled[first.Team] && first.Id!=second.Id && !first.SentOff && !second.SentOff &&
        FormationSkillNeighbors.AreNeighbors(skillFormations[first.Team],first.Id%11,second.Id%11);
}