using System.Diagnostics.CodeAnalysis;
using PkmnLib.Dynamic.Libraries;

namespace PkmnLib.Plugin.Gen7.Libraries.Battling;

/// <inheritdoc />
public class Gen7ExperienceGainCalculator : IExperienceGainCalculator
{
    /// <inheritdoc />
    [SuppressMessage("ReSharper", "UselessBinaryOperation")]
    public uint CalculateExperienceGain(IPokemon defeatedPokemon, IPokemon victoriousPokemon)
    {
        var b = defeatedPokemon.Form.BaseExperience;
        var levelFainted = defeatedPokemon.Level;
        var levelOpponent = victoriousPokemon.Level;
        // TODO: Experience share, in which case s = 2 for Pokemon that did not participate in battle
        var s = 1;

        var v1 = b * levelFainted / 5 * (1 / s);
        var v2 = (2 * levelFainted + 10) / (levelFainted + levelOpponent + 10);
        var res = v1 * Math.Pow(v2, 2.5) + 1;

        // TODO: t = 1.5 if the Pokemon is traded, and 1.7 is traded and has a different language
        var t = 1;
        res *= t;
        // TODO: script modifier, which is e.
        var e = 1;
        res *= e;
        // TODO: v = 1.2 if the Pokemon is at or past the level where it evolves
        var v = 1;
        res *= v;

        return res switch
        {
            > uint.MaxValue => uint.MaxValue,
            < 0 => 0,
            _ => (uint)res,
        };
    }
}