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using System;
using System.Collections.Generic;
using System.Linq.Expressions;
using System.Reflection;
using Firebase.Database.Query;
namespace Firebase.Database.Offline
{
public static class DatabaseExtensions
{
/// <summary>
/// Create new instances of the <see cref="RealtimeDatabase{T}" />.
/// </summary>
/// <typeparam name="T"> Type of elements. </typeparam>
/// <param name="filenameModifier"> Custom string which will get appended to the file name. </param>
/// <param name="elementRoot"> Optional custom root element of received json items. </param>
/// <param name="streamingOptions"> Realtime streaming options. </param>
/// <param name="initialPullStrategy"> Specifies what strategy should be used for initial pulling of server data. </param>
/// <param name="pushChanges">
/// Specifies whether changed items should actually be pushed to the server. It this is false,
/// then Put / Post / Delete will not affect server data.
/// </param>
/// <returns> The <see cref="RealtimeDatabase{T}" />. </returns>
public static RealtimeDatabase<T> AsRealtimeDatabase<T>(this ChildQuery query, string filenameModifier = "",
string elementRoot = "", StreamingOptions streamingOptions = StreamingOptions.LatestOnly,
InitialPullStrategy initialPullStrategy = InitialPullStrategy.MissingOnly, bool pushChanges = true)
where T : class
{
return new RealtimeDatabase<T>(query, elementRoot, query.Client.Options.OfflineDatabaseFactory,
filenameModifier, streamingOptions, initialPullStrategy, pushChanges);
}
/// <summary>
/// Create new instances of the <see cref="RealtimeDatabase{T}" />.
/// </summary>
/// <typeparam name="T"> Type of elements. </typeparam>
/// <typeparam name="TSetHandler"> Type of the custom <see cref="ISetHandler{T}" /> to use. </typeparam>
/// <param name="filenameModifier"> Custom string which will get appended to the file name. </param>
/// <param name="elementRoot"> Optional custom root element of received json items. </param>
/// <param name="streamingOptions"> Realtime streaming options. </param>
/// <param name="initialPullStrategy"> Specifies what strategy should be used for initial pulling of server data. </param>
/// <param name="pushChanges">
/// Specifies whether changed items should actually be pushed to the server. It this is false,
/// then Put / Post / Delete will not affect server data.
/// </param>
/// <returns> The <see cref="RealtimeDatabase{T}" />. </returns>
public static RealtimeDatabase<T> AsRealtimeDatabase<T, TSetHandler>(this ChildQuery query,
string filenameModifier = "", string elementRoot = "",
StreamingOptions streamingOptions = StreamingOptions.LatestOnly,
InitialPullStrategy initialPullStrategy = InitialPullStrategy.MissingOnly, bool pushChanges = true)
where T : class
where TSetHandler : ISetHandler<T>, new()
{
return new RealtimeDatabase<T>(query, elementRoot, query.Client.Options.OfflineDatabaseFactory,
filenameModifier, streamingOptions, initialPullStrategy, pushChanges,
Activator.CreateInstance<TSetHandler>());
}
/// <summary>
/// Overwrites existing object with given key leaving any missing properties intact in firebase.
/// </summary>
/// <param name="key"> The key. </param>
/// <param name="obj"> The object to set. </param>
/// <param name="syncOnline"> Indicates whether the item should be synced online. </param>
/// <param name="priority">
/// The priority. Objects with higher priority will be synced first. Higher number indicates higher
/// priority.
/// </param>
public static void Patch<T>(this RealtimeDatabase<T> db, string key, T obj, bool syncOnline = true,
int priority = 1)
where T : class
{
db.Set(key, obj, syncOnline ? SyncOptions.Patch : SyncOptions.None, priority);
}
/// <summary>
/// Overwrites existing object with given key.
/// </summary>
/// <param name="key"> The key. </param>
/// <param name="obj"> The object to set. </param>
/// <param name="syncOnline"> Indicates whether the item should be synced online. </param>
/// <param name="priority">
/// The priority. Objects with higher priority will be synced first. Higher number indicates higher
/// priority.
/// </param>
public static void Put<T>(this RealtimeDatabase<T> db, string key, T obj, bool syncOnline = true,
int priority = 1)
where T : class
{
db.Set(key, obj, syncOnline ? SyncOptions.Put : SyncOptions.None, priority);
}
/// <summary>
/// Adds a new entity to the Database.
/// </summary>
/// <param name="obj"> The object to add. </param>
/// <param name="syncOnline"> Indicates whether the item should be synced online. </param>
/// <param name="priority">
/// The priority. Objects with higher priority will be synced first. Higher number indicates higher
/// priority.
/// </param>
/// <returns> The generated key for this object. </returns>
public static string Post<T>(this RealtimeDatabase<T> db, T obj, bool syncOnline = true, int priority = 1)
where T : class
{
var key = FirebaseKeyGenerator.Next();
db.Set(key, obj, syncOnline ? SyncOptions.Put : SyncOptions.None, priority);
return key;
}
/// <summary>
/// Deletes the entity with the given key.
/// </summary>
/// <param name="key"> The key. </param>
/// <param name="syncOnline"> Indicates whether the item should be synced online. </param>
/// <param name="priority">
/// The priority. Objects with higher priority will be synced first. Higher number indicates higher
/// priority.
/// </param>
public static void Delete<T>(this RealtimeDatabase<T> db, string key, bool syncOnline = true, int priority = 1)
where T : class
{
db.Set(key, null, syncOnline ? SyncOptions.Put : SyncOptions.None, priority);
}
/// <summary>
/// Do a Put for a nested property specified by <paramref name="propertyExpression" /> of an object with key
/// <paramref name="key" />.
/// </summary>
/// <typeparam name="T"> Type of the root elements. </typeparam>
/// <typeparam name="TProperty"> Type of the property being modified</typeparam>
/// <param name="db"> Database instance. </param>
/// <param name="key"> Key of the root element to modify. </param>
/// <param name="propertyExpression"> Expression on the root element leading to target value to modify. </param>
/// <param name="value"> Value to put. </param>
/// <param name="syncOnline"> Indicates whether the item should be synced online. </param>
/// <param name="priority">
/// The priority. Objects with higher priority will be synced first. Higher number indicates higher
/// priority.
/// </param>
public static void Put<T, TProperty>(this RealtimeDatabase<T> db, string key,
Expression<Func<T, TProperty>> propertyExpression, TProperty value, bool syncOnline = true,
int priority = 1)
where T : class
{
db.Set(key, propertyExpression, value, syncOnline ? SyncOptions.Put : SyncOptions.None, priority);
}
/// <summary>
/// Do a Patch for a nested property specified by <paramref name="propertyExpression" /> of an object with key
/// <paramref name="key" />.
/// </summary>
/// <typeparam name="T"> Type of the root elements. </typeparam>
/// <typeparam name="TProperty"> Type of the property being modified</typeparam>
/// <param name="db"> Database instance. </param>
/// <param name="key"> Key of the root element to modify. </param>
/// <param name="propertyExpression"> Expression on the root element leading to target value to modify. </param>
/// <param name="value"> Value to patch. </param>
/// <param name="syncOnline"> Indicates whether the item should be synced online. </param>
/// <param name="priority">
/// The priority. Objects with higher priority will be synced first. Higher number indicates higher
/// priority.
/// </param>
public static void Patch<T, TProperty>(this RealtimeDatabase<T> db, string key,
Expression<Func<T, TProperty>> propertyExpression, TProperty value, bool syncOnline = true,
int priority = 1)
where T : class
{
db.Set(key, propertyExpression, value, syncOnline ? SyncOptions.Patch : SyncOptions.None, priority);
}
/// <summary>
/// Delete a nested property specified by <paramref name="propertyExpression" /> of an object with key
/// <paramref name="key" />. This basically does a Put with null value.
/// </summary>
/// <typeparam name="T"> Type of the root elements. </typeparam>
/// <typeparam name="TProperty"> Type of the property being modified</typeparam>
/// <param name="db"> Database instance. </param>
/// <param name="key"> Key of the root element to modify. </param>
/// <param name="propertyExpression"> Expression on the root element leading to target value to modify. </param>
/// <param name="value"> Value to put. </param>
/// <param name="syncOnline"> Indicates whether the item should be synced online. </param>
/// <param name="priority">
/// The priority. Objects with higher priority will be synced first. Higher number indicates higher
/// priority.
/// </param>
public static void Delete<T, TProperty>(this RealtimeDatabase<T> db, string key,
Expression<Func<T, TProperty>> propertyExpression, bool syncOnline = true, int priority = 1)
where T : class
where TProperty : class
{
db.Set(key, propertyExpression, null, syncOnline ? SyncOptions.Put : SyncOptions.None, priority);
}
/// <summary>
/// Post a new entity into the nested dictionary specified by <paramref name="propertyExpression" /> of an object with
/// key <paramref name="key" />.
/// The key of the new entity is automatically generated.
/// </summary>
/// <typeparam name="T"> Type of the root elements. </typeparam>
/// <typeparam name="TSelector"> Type of the dictionary being modified</typeparam>
/// <typeparam name="TProperty"> Type of the value within the dictionary being modified</typeparam>
/// <param name="db"> Database instance. </param>
/// <param name="key"> Key of the root element to modify. </param>
/// <param name="propertyExpression"> Expression on the root element leading to target value to modify. </param>
/// <param name="value"> Value to put. </param>
/// <param name="syncOnline"> Indicates whether the item should be synced online. </param>
/// <param name="priority">
/// The priority. Objects with higher priority will be synced first. Higher number indicates higher
/// priority.
/// </param>
public static void Post<T, TSelector, TProperty>(this RealtimeDatabase<T> db, string key,
Expression<Func<T, TSelector>> propertyExpression, TProperty value, bool syncOnline = true,
int priority = 1)
where T : class
where TSelector : IDictionary<string, TProperty>
{
var nextKey = FirebaseKeyGenerator.Next();
var expression = Expression.Lambda<Func<T, TProperty>>(
Expression.Call(propertyExpression.Body,
typeof(TSelector).GetRuntimeMethod("get_Item", new[] {typeof(string)}),
Expression.Constant(nextKey)), propertyExpression.Parameters);
db.Set(key, expression, value, syncOnline ? SyncOptions.Put : SyncOptions.None, priority);
}
/// <summary>
/// Delete an entity with key <paramref name="dictionaryKey" /> in the nested dictionary specified by
/// <paramref name="propertyExpression" /> of an object with key <paramref name="key" />.
/// The key of the new entity is automatically generated.
/// </summary>
/// <typeparam name="T"> Type of the root elements. </typeparam>
/// <typeparam name="TSelector"> Type of the dictionary being modified</typeparam>
/// <typeparam name="TProperty"> Type of the value within the dictionary being modified</typeparam>
/// <param name="db"> Database instance. </param>
/// <param name="key"> Key of the root element to modify. </param>
/// <param name="propertyExpression"> Expression on the root element leading to target value to modify. </param>
/// <param name="dictionaryKey"> Key within the nested dictionary to delete. </param>
/// <param name="syncOnline"> Indicates whether the item should be synced online. </param>
/// <param name="priority">
/// The priority. Objects with higher priority will be synced first. Higher number indicates higher
/// priority.
/// </param>
public static void Delete<T, TProperty>(this RealtimeDatabase<T> db, string key,
Expression<Func<T, IDictionary<string, TProperty>>> propertyExpression, string dictionaryKey,
bool syncOnline = true, int priority = 1)
where T : class
{
var expression = Expression.Lambda<Func<T, TProperty>>(
Expression.Call(propertyExpression.Body,
typeof(IDictionary<string, TProperty>).GetRuntimeMethod("get_Item", new[] {typeof(string)}),
Expression.Constant(dictionaryKey)), propertyExpression.Parameters);
db.Set(key, expression, null, syncOnline ? SyncOptions.Put : SyncOptions.None, priority);
}
}
}
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