using Newtonsoft.Json;
using System;
using System.Collections.Generic;
using System.Linq;
using UnityEngine;

namespace Nox.Game {
    public interface IEntityDefinition {
        string ID { get; }
        string DisplayName { get; }
        EntityAttributes Attributes { get; }
        EntityStats Stats { get; }
    }

    public enum CharacterRole {
        None,
        Protagonist,
        Companion
    }

    public enum CharacterClass {
        None,
        Warrior,
        Rogue,
        Mage,
        Herald
    }

    public enum CharacterRace {
        None,
        Human,
        DarkElf,
        Tunneler
    }

    [Serializable]
    public sealed class EntityAttributes {
        public int might;
        public int reflex;
        public int knowledge;
        public int perception;

        public static EntityAttributes operator +(EntityAttributes a, EntityAttributes b) {
            return new EntityAttributes {
                might = a.might + b.might,
                reflex = a.reflex + b.reflex,
                knowledge = a.knowledge + b.knowledge,
                perception = a.perception + b.perception
            };
        }
    }

    [Serializable]
    public sealed class EntityStats {
        public int health;
        public int stamina;
        public int level;
        public int experience;
    }

    [Serializable]
    public sealed class PerkDefinition {
        public string id;
        public string name;
        public ModifiersData modifiers = new ();
    }

    [Serializable]
    public sealed class PerksData {
        public List<PerkDefinition> perks = new ();
    }

    [Serializable]
    public sealed class CharacterDefinition : IEntityDefinition {
        [SerializeField] private string id;
        [SerializeField] private string displayName;
        public CharacterRace race;
        public CharacterClass @class;
        public CharacterRole role;
        [SerializeField]  EntityAttributes attributes;
        [SerializeField]  EntityStats stats;
        public PerksData perksData = new();
        public ModifiersData activeModifiers = new();

        public CharacterDefinition Clone() {
            return new CharacterDefinition {
                id = id,
                displayName = displayName,
                role = role,
                race = race,
                @class = @class,
                attributes = new EntityAttributes {
                    might = attributes?.might ?? 1,
                    reflex = attributes?.reflex ?? 1,
                    knowledge = attributes?.knowledge ?? 1
                },
                stats = new EntityStats {
                    health = stats?.health ?? 1,
                    stamina = stats?.stamina ?? 1
                },
                perksData = new PerksData(),
                activeModifiers = new ModifiersData()
            };
        }

        public string ID {
            get => id;
            set => id = value;
        }

        public string DisplayName {
            get => displayName;
            set => displayName = value;
        }
        public EntityAttributes Attributes {
            get => attributes;
            set => attributes = value;
        }

        public EntityStats Stats {
            get => stats;
            set => stats = value;
        }
    }

    [Serializable]
    public sealed class PartyDefinition {
        public int maxPartySize;
        public List<CharacterDefinition> members = new();

        [JsonIgnore]
        public CharacterDefinition Protagonist => members.FirstOrDefault(m => m.role == CharacterRole.Protagonist);

        [JsonIgnore]
        public IReadOnlyList<CharacterDefinition> Companions => members.Where(m => m.role == CharacterRole.Companion).ToList();
    }
}