From ea0309436b55d72f57478ed6f74bf31d000f5366 Mon Sep 17 00:00:00 2001
From: HampusM <hampus@hampusmat.com>
Date: Sat, 3 Sep 2022 11:49:49 +0200
Subject: refactor: improve DI container cast errors

---
 src/di_container.rs        | 15 +++++++++++----
 src/errors/di_container.rs | 13 +++++++++++--
 2 files changed, 22 insertions(+), 6 deletions(-)

diff --git a/src/di_container.rs b/src/di_container.rs
index b0e5af1..df95be4 100644
--- a/src/di_container.rs
+++ b/src/di_container.rs
@@ -384,12 +384,18 @@ impl DIContainer
         match binding_providable {
             Providable::Transient(transient_binding) => Ok(SomePtr::Transient(
                 transient_binding.cast::<Interface>().map_err(|_| {
-                    DIContainerError::CastFailed(type_name::<Interface>())
+                    DIContainerError::CastFailed {
+                        interface: type_name::<Interface>(),
+                        binding_kind: "transient",
+                    }
                 })?,
             )),
             Providable::Singleton(singleton_binding) => Ok(SomePtr::Singleton(
                 singleton_binding.cast::<Interface>().map_err(|_| {
-                    DIContainerError::CastFailed(type_name::<Interface>())
+                    DIContainerError::CastFailed {
+                        interface: type_name::<Interface>(),
+                        binding_kind: "singleton",
+                    }
                 })?,
             )),
             #[cfg(feature = "factory")]
@@ -401,8 +407,9 @@ impl DIContainer
 
                         let default_factory = factory_binding
                             .cast::<dyn IFactory<(), Interface>>()
-                            .map_err(|_| {
-                                DIContainerError::CastFailed(type_name::<Interface>())
+                            .map_err(|_| DIContainerError::CastFailed {
+                                interface: type_name::<Interface>(),
+                                binding_kind: "factory",
                             })?;
 
                         Ok(SomePtr::Transient(default_factory()))
diff --git a/src/errors/di_container.rs b/src/errors/di_container.rs
index 82a3d55..5e53f43 100644
--- a/src/errors/di_container.rs
+++ b/src/errors/di_container.rs
@@ -11,8 +11,17 @@ use crate::errors::injectable::InjectableError;
 pub enum DIContainerError
 {
     /// Unable to cast a binding for a interface.
-    #[error("Unable to cast binding for interface '{0}'")]
-    CastFailed(&'static str),
+    #[error(
+        "Unable to cast binding for interface '{interface} with kind '{binding_kind}'"
+    )]
+    CastFailed
+    {
+        /// The interface.
+        interface: &'static str,
+
+        /// The kind of the found binding.
+        binding_kind: &'static str,
+    },
 
     /// Failed to resolve a binding for a interface.
     #[error("Failed to resolve binding for interface '{interface}'")]
-- 
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