using Nop.Core;
using Nop.Core.Caching;
using Nop.Core.Domain.Catalog;
using Nop.Core.Domain.Stores;
using Nop.Data;

namespace Nop.Services.Stores;

/// <summary>
/// Store mapping service
/// </summary>
public partial class StoreMappingService : IStoreMappingService
{
    #region Fields

    protected readonly CatalogSettings _catalogSettings;
    protected readonly IRepository<StoreMapping> _storeMappingRepository;
    protected readonly IStaticCacheManager _staticCacheManager;
    protected readonly IStoreContext _storeContext;

    #endregion

    #region Ctor

    public StoreMappingService(CatalogSettings catalogSettings,
        IRepository<StoreMapping> storeMappingRepository,
        IStaticCacheManager staticCacheManager,
        IStoreContext storeContext)
    {
        _catalogSettings = catalogSettings;
        _storeMappingRepository = storeMappingRepository;
        _staticCacheManager = staticCacheManager;
        _storeContext = storeContext;
    }

    #endregion

    #region Utilities

    /// <summary>
    /// Inserts a store mapping record
    /// </summary>
    /// <param name="storeMapping">Store mapping</param>
    /// <returns>A task that represents the asynchronous operation</returns>
    protected virtual async Task InsertStoreMappingAsync(StoreMapping storeMapping)
    {
        await _storeMappingRepository.InsertAsync(storeMapping);
    }

    /// <summary>
    /// Get a value indicating whether a store mapping exists for an entity type
    /// </summary>
    /// <typeparam name="TEntity">Type of entity that supports store mapping</typeparam>
    /// <returns>
    /// A task that represents the asynchronous operation
    /// The task result contains true if exists; otherwise false
    /// </returns>
    protected virtual async Task<bool> IsEntityMappingExistsAsync<TEntity>() where TEntity : BaseEntity, IStoreMappingSupported
    {
        var entityName = typeof(TEntity).Name;
        var key = _staticCacheManager.PrepareKeyForDefaultCache(NopStoreDefaults.StoreMappingExistsCacheKey, entityName);

        var query = from sm in _storeMappingRepository.Table
            where sm.EntityName == entityName
            select sm.StoreId;

        return await _staticCacheManager.GetAsync(key, query.Any);
    }

    #endregion

    #region Methods

    /// <summary>
    /// Apply store mapping to the passed query
    /// </summary>
    /// <typeparam name="TEntity">Type of entity that supports store mapping</typeparam>
    /// <param name="query">Query to filter</param>
    /// <param name="storeId">Store identifier</param>
    /// <returns>
    /// A task that represents the asynchronous operation
    /// The task result contains the filtered query
    /// </returns>
    public virtual async Task<IQueryable<TEntity>> ApplyStoreMapping<TEntity>(IQueryable<TEntity> query, int storeId)
        where TEntity : BaseEntity, IStoreMappingSupported
    {
        ArgumentNullException.ThrowIfNull(query);

        if (storeId == 0 || _catalogSettings.IgnoreStoreLimitations || !await IsEntityMappingExistsAsync<TEntity>())
            return query;

        return from entity in query
            where !entity.LimitedToStores || _storeMappingRepository.Table.Any(sm =>
                sm.EntityName == typeof(TEntity).Name && sm.EntityId == entity.Id && sm.StoreId == storeId)
            select entity;
    }

    /// <summary>
    /// Deletes a store mapping record
    /// </summary>
    /// <param name="storeMapping">Store mapping record</param>
    /// <returns>A task that represents the asynchronous operation</returns>
    public virtual async Task DeleteStoreMappingAsync(StoreMapping storeMapping)
    {
        await _storeMappingRepository.DeleteAsync(storeMapping);
    }

    /// <summary>
    /// Gets store mapping records
    /// </summary>
    /// <typeparam name="TEntity">Type of entity that supports store mapping</typeparam>
    /// <param name="entity">Entity</param>
    /// <returns>
    /// A task that represents the asynchronous operation
    /// The task result contains the store mapping records
    /// </returns>
    public virtual async Task<IList<StoreMapping>> GetStoreMappingsAsync<TEntity>(TEntity entity) where TEntity : BaseEntity, IStoreMappingSupported
    {
        ArgumentNullException.ThrowIfNull(entity);

        var entityId = entity.Id;
        var entityName = entity.GetType().Name;

        var key = _staticCacheManager.PrepareKeyForDefaultCache(NopStoreDefaults.StoreMappingsCacheKey, entityId, entityName);

        var query = from sm in _storeMappingRepository.Table
            where sm.EntityId == entityId &&
                  sm.EntityName == entityName
            select sm;

        var storeMappings = await _staticCacheManager.GetAsync(key, async () => await query.ToListAsync());

        return storeMappings;
    }

    /// <summary>
    /// Inserts a store mapping record
    /// </summary>
    /// <typeparam name="TEntity">Type of entity that supports store mapping</typeparam>
    /// <param name="entity">Entity</param>
    /// <param name="storeId">Store id</param>
    /// <returns>A task that represents the asynchronous operation</returns>
    public virtual async Task InsertStoreMappingAsync<TEntity>(TEntity entity, int storeId) where TEntity : BaseEntity, IStoreMappingSupported
    {
        ArgumentNullException.ThrowIfNull(entity);

        if (storeId == 0)
            throw new ArgumentOutOfRangeException(nameof(storeId));

        var entityId = entity.Id;
        var entityName = entity.GetType().Name;

        var storeMapping = new StoreMapping
        {
            EntityId = entityId,
            EntityName = entityName,
            StoreId = storeId
        };

        await InsertStoreMappingAsync(storeMapping);
    }

    /// <summary>
    /// Find store identifiers with granted access (mapped to the entity)
    /// </summary>
    /// <typeparam name="TEntity">Type of entity that supports store mapping</typeparam>
    /// <param name="entity">Entity</param>
    /// <returns>
    /// A task that represents the asynchronous operation
    /// The task result contains the store identifiers
    /// </returns>
    public virtual async Task<int[]> GetStoresIdsWithAccessAsync<TEntity>(TEntity entity) where TEntity : BaseEntity, IStoreMappingSupported
    {
        ArgumentNullException.ThrowIfNull(entity);

        var entityId = entity.Id;
        var entityName = entity.GetType().Name;

        var key = _staticCacheManager.PrepareKeyForDefaultCache(NopStoreDefaults.StoreMappingIdsCacheKey, entityId, entityName);

        var query = from sm in _storeMappingRepository.Table
            where sm.EntityId == entityId &&
                  sm.EntityName == entityName
            select sm.StoreId;

        return await _staticCacheManager.GetAsync(key, () => query.ToArray());
    }

    /// <summary>
    /// Find store identifiers with granted access (mapped to the entity)
    /// </summary>
    /// <typeparam name="TEntity">Type of entity that supports store mapping</typeparam>
    /// <param name="entity">Entity</param>
    /// <returns>
    /// The store identifiers
    /// </returns>
    public virtual int[] GetStoresIdsWithAccess<TEntity>(TEntity entity) where TEntity : BaseEntity, IStoreMappingSupported
    {
        ArgumentNullException.ThrowIfNull(entity);

        var entityId = entity.Id;
        var entityName = entity.GetType().Name;

        var key = _staticCacheManager.PrepareKeyForDefaultCache(NopStoreDefaults.StoreMappingIdsCacheKey, entityId, entityName);

        var query = from sm in _storeMappingRepository.Table
            where sm.EntityId == entityId &&
                  sm.EntityName == entityName
            select sm.StoreId;

        return _staticCacheManager.Get(key, () => query.ToArray());
    }

    /// <summary>
    /// Authorize whether entity could be accessed in the current store (mapped to this store)
    /// </summary>
    /// <typeparam name="TEntity">Type of entity that supports store mapping</typeparam>
    /// <param name="entity">Entity</param>
    /// <returns>
    /// A task that represents the asynchronous operation
    /// The task result contains true - authorized; otherwise, false
    /// </returns>
    public virtual async Task<bool> AuthorizeAsync<TEntity>(TEntity entity) where TEntity : BaseEntity, IStoreMappingSupported
    {
        var store = await _storeContext.GetCurrentStoreAsync();

        return await AuthorizeAsync(entity, store.Id);
    }

    /// <summary>
    /// Authorize whether entity could be accessed in a store (mapped to this store)
    /// </summary>
    /// <typeparam name="TEntity">Type of entity that supports store mapping</typeparam>
    /// <param name="entity">Entity</param>
    /// <param name="storeId">Store identifier</param>
    /// <returns>
    /// A task that represents the asynchronous operation
    /// The task result contains true - authorized; otherwise, false
    /// </returns>
    public virtual async Task<bool> AuthorizeAsync<TEntity>(TEntity entity, int storeId) where TEntity : BaseEntity, IStoreMappingSupported
    {
        if (entity == null)
            return false;

        if (storeId == 0)
            //return true if no store specified/found
            return true;

        if (_catalogSettings.IgnoreStoreLimitations)
            return true;

        if (!entity.LimitedToStores)
            return true;

        foreach (var storeIdWithAccess in await GetStoresIdsWithAccessAsync(entity))
            if (storeId == storeIdWithAccess)
                //yes, we have such permission
                return true;

        //no permission found
        return false;
    }

    /// <summary>
    /// Authorize whether entity could be accessed in a store (mapped to this store)
    /// </summary>
    /// <typeparam name="TEntity">Type of entity that supports store mapping</typeparam>
    /// <param name="entity">Entity</param>
    /// <param name="storeId">Store identifier</param>
    /// <returns>
    /// True - authorized; otherwise, false
    /// </returns>
    public virtual bool Authorize<TEntity>(TEntity entity, int storeId) where TEntity : BaseEntity, IStoreMappingSupported
    {
        if (entity == null)
            return false;

        if (storeId == 0)
            //return true if no store specified/found
            return true;

        if (_catalogSettings.IgnoreStoreLimitations)
            return true;

        if (!entity.LimitedToStores)
            return true;

        foreach (var storeIdWithAccess in GetStoresIdsWithAccess(entity))
            if (storeId == storeIdWithAccess)
                //yes, we have such permission
                return true;

        //no permission found
        return false;
    }

    #endregion
}