using System.Diagnostics.CodeAnalysis;
using System.Linq.Expressions;
using System.Reflection;
using Microsoft.EntityFrameworkCore;
using Microsoft.EntityFrameworkCore.Metadata.Builders;
using Pf2eModel.Model;
using Pf2eModel.Model.Base;
using Pf2eModel.Model.Base.Keywords;
using Pf2eModel.Model.Base.Source;
using Pf2eModel.Model.Base.Targets;
using Pf2eModel.Model.Common;
using Pf2eModel.Model.Common.I18n;
using Pf2eModel.Model.Structure;
using Pf2eModel.Model.Structure.AncestryRelation;
using Pf2eModel.Model.Structure.ArchetypeRelation;
using Pf2eModel.Model.Structure.BackgroundRelation;
using Pf2eModel.Model.Structure.ClassRelation;
using Pf2eModel.Model.Structure.DeityRelation;
using Pf2eModel.Model.Structure.FeatRelation;
using Pf2eModel.Model.Structure.RitualRelation;
using Pf2eModel.Model.Structure.SpellRelation;

namespace Pf2eModel;

/// <inheritdoc/>
[SuppressMessage("ReSharper", "InconsistentNaming")]
public partial class Pf2eDbContext
{
    /// <summary>
    /// Длина названия сущности.
    /// </summary>
    public const int NameLength = 255;

    /// <inheritdoc/>
    protected override void OnModelCreating(ModelBuilder modelBuilder)
    {
        modelBuilder.UseIdentityByDefaultColumns();

        // DefineEnums(modelBuilder);
        DefineBase(modelBuilder);
        DefineCommon(modelBuilder);
        DefineStructure(modelBuilder);
        DefineMethods(modelBuilder);
    }

    /// <summary>
    /// Устанавливает связь между сущностью и её корневой сущностью.
    /// </summary>
    /// <typeparam name="T">Тип сущности.</typeparam>
    /// <param name="entity">Генератор настроек таблицы сущности.</param>
    private void BindEntity<T>(EntityTypeBuilder<T> entity)
        where T : class, IEntity
    {
        entity
            .HasOne(e => e.Entity)
            .WithOne()
            .HasForeignKey<T>(e => e.Id)
            .IsRequired()
            .OnDelete(DeleteBehavior.Cascade);
    }

    /// <summary>
    /// Устанавливает связь между сущностью и локализованной строкой.
    /// </summary>
    /// <typeparam name="T">Тип сущности.</typeparam>
    /// <param name="entity">Генератор настроек таблицы сущности.</param>
    /// <param name="func">Функция, выбирающая поле сущности.</param>
    /// <param name="required">Флаг, указывающий, что локализованная строка не может быть `null`.</param>
    private void BindLocaleString<T>(
        EntityTypeBuilder<T> entity,
        Expression<Func<T, LocaleString?>> func,
        bool required = true
    )
        where T : class
    {
        entity
            .Property(func)
            .HasConversion(
                v => v == null ? null : v.Serialize(),
                v => v == null ? null : LocaleString.Deserialize(v)
            )
            .HasColumnType("jsonb")
            .IsRequired(required);
    }

    /// <summary>
    /// Определяет базовые сущности и их связи.
    /// </summary>
    /// <param name="modelBuilder">Построитель модели.</param>
    private void DefineBase(ModelBuilder modelBuilder)
    {
        modelBuilder.Entity<Entity>(entity =>
        {
            BindLocaleString(entity, e => e.Name);

            entity.HasMany(e => e.Traits).WithMany(t => t.Entities);

            entity.HasMany(e => e.Keywords).WithMany(t => t.Entities);

            // EntityAliases
            entity
                .HasMany(e => e.Aliases)
                .WithOne(a => a.Entity)
                .HasForeignKey(a => a.EntityId)
                .OnDelete(DeleteBehavior.Cascade);

            // EntitySource
            entity
                .HasMany(e => e.Sources)
                .WithOne(e => e.Entity)
                .HasForeignKey(e => e.EntityId)
                .OnDelete(DeleteBehavior.Cascade);

            // EntityExternal
            entity
                .HasMany(e => e.Externals)
                .WithOne(e => e.Entity)
                .HasForeignKey(e => e.EntityId)
                .OnDelete(DeleteBehavior.Cascade);

            // LegacyRemaster
            entity
                .HasMany(e => e.LegacyEntities)
                .WithMany(e => e.RemasterEntities)
                .UsingEntity<LegacyRemaster>(
                    l =>
                        l.HasOne(lr => lr.LegacyEntity)
                            .WithMany(e => e.LegacyTransferEntities)
                            .HasForeignKey(lr => lr.LegacyId),
                    r =>
                        r.HasOne(lr => lr.RemasterEntity)
                            .WithMany(e => e.RemasterTransferEntities)
                            .HasForeignKey(lr => lr.RemasterId)
                );
        });

        // Source
        modelBuilder.Entity<Source>(entity =>
        {
            entity.Property(e => e.Id).HasColumnName("id");

            entity
                .HasMany(s => s.EntitySources)
                .WithOne(e => e.Source)
                .HasForeignKey(e => e.SourceId)
                .OnDelete(DeleteBehavior.Cascade);

            // + EntitySource
        });
        modelBuilder.Entity<EntitySource>(entity => { });

        // External
        modelBuilder.Entity<ExternalTarget>(entity =>
        {
            entity
                .HasMany(t => t.EntityExternals)
                .WithOne(e => e.Target)
                .HasForeignKey(e => e.TargetId)
                .OnDelete(DeleteBehavior.Cascade);
        });
        modelBuilder.Entity<EntityExternal>(entity => { });

        // Keywords
        modelBuilder.Entity<Keyword>(entity =>
        {
            BindLocaleString(entity, k => k.Name);

            entity
                .HasMany(e => e.Aliases)
                .WithOne(e => e.Keyword)
                .HasForeignKey(e => e.KeywordId)
                .OnDelete(DeleteBehavior.Cascade);
        });
        modelBuilder.Entity<KeywordAlias>(entity => { });
    }

    /// <summary>
    /// Определяет общие сущности и их связи.
    /// </summary>
    /// <param name="modelBuilder">Построитель модели.</param>
    private void DefineCommon(ModelBuilder modelBuilder)
    {
        modelBuilder.Entity<Frequency>(entity => { });

        modelBuilder.Entity<Language>(entity => { });

        modelBuilder.Entity<Training>(entity =>
        {
            BindLocaleString(entity, t => t.Name);
        });
    }

    /// <summary>
    /// Определяет структуру сущностей и их связи.
    /// </summary>
    /// <param name="modelBuilder">Построитель модели.</param>
    private void DefineStructure(ModelBuilder modelBuilder)
    {
        // Action
        modelBuilder.Entity<Model.Structure.Action>(entity =>
        {
            BindEntity(entity);
        });

        // Ancestry
        modelBuilder.Entity<Ancestry>(entity =>
        {
            BindEntity(entity);

            entity
                .HasMany(e => e.AncestryBoosts)
                .WithOne(e => e.Ancestry)
                .HasForeignKey(e => e.AncestryId)
                .OnDelete(DeleteBehavior.Cascade);

            entity
                .HasMany(e => e.AncestryItems)
                .WithOne(e => e.Ancestry)
                .HasForeignKey(e => e.AncestryId)
                .OnDelete(DeleteBehavior.Cascade);

            entity
                .HasMany(e => e.AncestryLanguages)
                .WithOne(e => e.Ancestry)
                .HasForeignKey(e => e.AncestryId)
                .OnDelete(DeleteBehavior.Cascade);
        });
        modelBuilder.Entity<AncestryBoost>(entity => { });
        modelBuilder.Entity<AncestryItem>(entity =>
        {
            entity
                .HasOne(d => d.Item)
                .WithMany()
                .HasForeignKey(d => d.ItemId)
                .OnDelete(DeleteBehavior.Cascade);
        });
        modelBuilder.Entity<AncestryLanguage>(entity =>
        {
            entity
                .HasOne(d => d.Language)
                .WithMany()
                .HasForeignKey(d => d.LanguageId)
                .OnDelete(DeleteBehavior.Cascade);
        });

        // Archetype
        modelBuilder.Entity<Archetype>(entity =>
        {
            BindEntity(entity);

            entity
                .HasOne(a => a.DedicationFeat)
                .WithOne()
                .HasForeignKey<Archetype>(a => a.DedicationFeatId)
                .OnDelete(DeleteBehavior.Cascade);

            entity
                .HasMany(a => a.Feats)
                .WithMany(f => f.Archetypes)
                .UsingEntity<ArchetypeFeats>(
                    l => l.HasOne<Feat>().WithMany().HasForeignKey(af => af.FeatId),
                    r => r.HasOne<Archetype>().WithMany().HasForeignKey(af => af.ArchetypeId)
                );
        });

        // Background
        modelBuilder.Entity<Background>(entity =>
        {
            BindEntity(entity);
        });
        modelBuilder.Entity<BackgroundBoost>(entity =>
        {
            entity
                .HasOne(d => d.Background)
                .WithMany(p => p.BackgroundBoosts)
                .HasForeignKey(d => d.BackgroundId)
                .OnDelete(DeleteBehavior.Cascade);
        });
        modelBuilder.Entity<BackgroundItem>(entity =>
        {
            entity
                .HasOne(d => d.Background)
                .WithMany(p => p.BackgroundItems)
                .HasForeignKey(d => d.BackgroundId)
                .OnDelete(DeleteBehavior.Cascade);

            entity
                .HasOne(d => d.Entity)
                .WithMany()
                .HasForeignKey(d => d.EntityId)
                .OnDelete(DeleteBehavior.Cascade);
        });
        modelBuilder.Entity<BackgroundTraining>(entity =>
        {
            entity
                .HasOne(d => d.Background)
                .WithMany(p => p.BackgroundSkills)
                .HasForeignKey(d => d.BackgroundId)
                .OnDelete(DeleteBehavior.Cascade);
        });

        // Class
        modelBuilder.Entity<Class>(entity =>
        {
            BindEntity(entity);
        });
        modelBuilder.Entity<ClassKeyAbility>(entity =>
        {
            entity
                .HasOne(d => d.Class)
                .WithMany(p => p.ClassKeyAbilities)
                .HasForeignKey(d => d.ClassId)
                .OnDelete(DeleteBehavior.Cascade);
        });
        modelBuilder.Entity<ClassProgression>(entity =>
        {
            entity
                .HasOne(d => d.Class)
                .WithMany(p => p.ClassProgressions)
                .HasForeignKey(d => d.ClassId)
                .OnDelete(DeleteBehavior.Cascade);

            entity
                .HasOne(d => d.Entity)
                .WithMany()
                .HasForeignKey(d => d.EntityId)
                .OnDelete(DeleteBehavior.SetNull);
        });
        modelBuilder.Entity<ClassTraining>(entity =>
        {
            entity
                .HasOne(d => d.Class)
                .WithMany(p => p.ClassTrainings)
                .HasForeignKey(d => d.ClassId)
                .OnDelete(DeleteBehavior.Cascade);

            entity
                .HasOne(d => d.Training)
                .WithMany()
                .HasForeignKey(d => d.TrainingId)
                .OnDelete(DeleteBehavior.SetNull);
        });

        // Subclass
        modelBuilder.Entity<SubclassGroup>(entity =>
        {
            BindEntity(entity);

            entity
                .HasOne(g => g.Class)
                .WithMany(c => c.SubclassGroups)
                .HasForeignKey(g => g.ClassId)
                .OnDelete(DeleteBehavior.Cascade);
        });
        modelBuilder.Entity<Subclass>(entity =>
        {
            BindEntity(entity);

            BindLocaleString(entity, s => s.Additional);

            entity
                .HasOne(s => s.Group)
                .WithMany(g => g.Subclasses)
                .HasForeignKey(s => s.GroupId)
                .OnDelete(DeleteBehavior.Cascade);

            entity
                .HasMany(e => e.Entities)
                .WithMany()
                .UsingEntity<SubclassProvidedEntities>(
                    l => l.HasOne<Entity>().WithMany().HasForeignKey(se => se.EntityId),
                    r => r.HasOne<Subclass>().WithMany().HasForeignKey(se => se.SubclassId)
                );

            entity
                .HasMany(e => e.Trainings)
                .WithOne(t => t.Subclass)
                .HasForeignKey(t => t.SubclassId)
                .OnDelete(DeleteBehavior.Cascade);
        });
        modelBuilder.Entity<SubclassTrainings>(entity =>
        {
            entity
                .HasOne(d => d.Subclass)
                .WithMany(p => p.Trainings)
                .HasForeignKey(d => d.SubclassId)
                .OnDelete(DeleteBehavior.Cascade);
        });

        // Condition
        modelBuilder.Entity<Condition>(entity =>
        {
            BindEntity(entity);
        });

        // Deity
        modelBuilder.Entity<Deity>(entity =>
        {
            BindEntity(entity);

            entity
                .HasMany(e => e.DeityAttributes)
                .WithOne(e => e.Deity)
                .HasForeignKey(e => e.DeityId)
                .OnDelete(DeleteBehavior.Cascade);

            entity
                .HasMany(e => e.DeityDomains)
                .WithOne(e => e.Deity)
                .HasForeignKey(e => e.DeityId)
                .OnDelete(DeleteBehavior.Cascade);

            entity
                .HasMany(e => e.DeitySpells)
                .WithOne(e => e.Deity)
                .HasForeignKey(e => e.DeityId)
                .OnDelete(DeleteBehavior.Cascade);

            entity
                .HasMany(e => e.DeityWeapons)
                .WithOne(e => e.Deity)
                .HasForeignKey(e => e.DeityId)
                .OnDelete(DeleteBehavior.Cascade);

            entity.HasMany(e => e.Skills).WithMany();
        });
        modelBuilder.Entity<DeityAttribute>(entity => { });
        modelBuilder.Entity<DeityDomain>(entity => { });
        modelBuilder.Entity<DeitySpell>(entity =>
        {
            entity
                .HasOne(d => d.Spell)
                .WithMany()
                .HasForeignKey(d => d.SpellId)
                .OnDelete(DeleteBehavior.Cascade);
        });
        modelBuilder.Entity<DeityWeapon>(entity => { });

        // Feat
        modelBuilder.Entity<Feat>(entity =>
        {
            BindEntity(entity);

            entity
                .HasMany(e => e.FeatPrerequisites)
                .WithOne(e => e.Feat)
                .HasForeignKey(e => e.FeatId)
                .OnDelete(DeleteBehavior.Cascade);
        });
        modelBuilder.Entity<FeatPrerequisite>(entity => { });

        // Heritage
        modelBuilder.Entity<Heritage>(entity =>
        {
            BindEntity(entity);

            entity
                .HasOne(d => d.Ancestry)
                .WithMany(p => p.Heritages)
                .HasForeignKey(d => d.AncestryId)
                .OnDelete(DeleteBehavior.Cascade);
        });

        // Spell
        modelBuilder.Entity<Spell>(entity =>
        {
            BindEntity(entity);

            BindLocaleString(entity, s => s.Trigger, false);
            BindLocaleString(entity, s => s.Target, false);
            BindLocaleString(entity, s => s.Cost, false);
            BindLocaleString(entity, s => s.Requirement, false);

            entity
                .HasMany(e => e.SpellAreas)
                .WithOne(e => e.Spell)
                .HasForeignKey(e => e.SpellId)
                .OnDelete(DeleteBehavior.Cascade);

            entity
                .HasMany(e => e.SpellDefenses)
                .WithOne(e => e.Spell)
                .HasForeignKey(e => e.SpellId)
                .OnDelete(DeleteBehavior.Cascade);
        });
        modelBuilder.Entity<SpellArea>(entity =>
        {
            BindLocaleString(entity, a => a.Details, false);
        });
        modelBuilder.Entity<SpellDefense>(entity => { });

        // Ritual
        modelBuilder.Entity<Ritual>(entity =>
        {
            BindEntity(entity);

            BindLocaleString(entity, s => s.RangeString, false);
            BindLocaleString(entity, s => s.Target, false);
            BindLocaleString(entity, s => s.Cost, false);
            BindLocaleString(entity, s => s.Requirement, false);
            BindLocaleString(entity, s => s.PrimaryCheckSuffix, false);
            BindLocaleString(entity, s => s.SecondaryCastersSuffix, false);

            entity
                .HasOne(r => r.Area)
                .WithOne(a => a.Ritual)
                .HasForeignKey<RitualArea>(a => a.RitualId)
                .OnDelete(DeleteBehavior.Cascade);

            entity
                .HasMany(r => r.Checks)
                .WithOne(c => c.Ritual)
                .HasForeignKey(c => c.RitualId)
                .OnDelete(DeleteBehavior.Cascade);
        });
        modelBuilder.Entity<RitualArea>(entity =>
        {
            BindLocaleString(entity, a => a.Details, false);
        });

        modelBuilder.Entity<RitualCheck>(entity =>
        {
            BindLocaleString(entity, a => a.TrainingString, false);

            entity
                .HasOne(c => c.Training)
                .WithMany()
                .HasForeignKey(c => c.TrainingId)
                .OnDelete(DeleteBehavior.SetNull);
        });

        // Trait
        modelBuilder.Entity<Trait>(entity =>
        {
            BindEntity(entity);
        });

        // Rule
        modelBuilder.Entity<Rule>(entity =>
        {
            BindEntity(entity);

            entity
                .HasOne(r => r.Parent)
                .WithMany(r => r.Children)
                .HasForeignKey(r => r.ParentId)
                .IsRequired(false);
        });
    }

    /// <summary>
    /// Определяет методы, которые будут использоваться в запросах LINQ.
    /// </summary>
    /// <param name="modelBuilder">Построитель модели.</param>
    private void DefineMethods(ModelBuilder modelBuilder)
    {
        MethodInfo localeSearch = typeof(Pf2eDbContext).GetMethod(
            nameof(LocaleSearch),
            BindingFlags.Static | BindingFlags.Public,
            [typeof(LocaleString), typeof(string)]
        )!;
        modelBuilder.HasDbFunction(
            localeSearch,
            builder =>
            {
                builder.HasName("locale_search");
                builder.HasParameter("data").HasStoreType("jsonb");
                builder.HasParameter("search_value");
            }
        );

        MethodInfo localeSearchArray = typeof(Pf2eDbContext).GetMethod(
            nameof(LocaleSearchArray),
            BindingFlags.Static | BindingFlags.Public,
            [typeof(LocaleString), typeof(IEnumerable<string>)]
        )!;
        modelBuilder.HasDbFunction(
            localeSearchArray,
            builder =>
            {
                builder.HasName("locale_search_array");
                builder.HasParameter("data").HasStoreType("jsonb");
                builder.HasParameter("search_values");
            }
        );
    }

    // ReSharper disable once InconsistentNaming
    public static bool LocaleSearch(LocaleString data, string search_value) =>
        throw new InvalidOperationException("Only for LINQ translation");

    // ReSharper disable once InconsistentNaming
    public static bool LocaleSearchArray(LocaleString data, IEnumerable<string> search_values) =>
        throw new InvalidOperationException("Only for LINQ translation");
}