Fix email validation dependency issue

- Add email-validator to requirements.txt
- Add fallback email validation for user and supplier schemas
- Implement graceful handling when email-validator is not installed

app/schemas/supplier.py

@@ -1,17 +1,40 @@
+import re
 from typing import Optional
-from pydantic import BaseModel, EmailStr
+from pydantic import BaseModel, validator
+
+# Try to import EmailStr, but fallback to str if email-validator is not installed
+try:
+    from pydantic import EmailStr
+    email_type = EmailStr
+except ImportError:
+    email_type = str
 
 
 # Shared properties
 class SupplierBase(BaseModel):
     name: Optional[str] = None
     contact_name: Optional[str] = None
-    email: Optional[EmailStr] = None
+    email: Optional[email_type] = None
     phone: Optional[str] = None
     address: Optional[str] = None
     website: Optional[str] = None
     notes: Optional[str] = None
     
+    # Add email validation if using fallback str type
+    @validator('email')
+    def validate_email(cls, v):
+        if v is None:
+            return v
+            
+        if not isinstance(v, str):
+            return v
+            
+        # Basic email validation pattern
+        pattern = r'^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}$'
+        if not re.match(pattern, v):
+            raise ValueError('Invalid email format')
+        return v
+
 
 # Properties to receive on supplier creation
 class SupplierCreate(SupplierBase):

app/schemas/user.py

@@ -1,18 +1,41 @@
+import re
 from typing import Optional
-from pydantic import BaseModel, EmailStr
+from pydantic import BaseModel, validator
+
+# Try to import EmailStr, but fallback to str if email-validator is not installed
+try:
+    from pydantic import EmailStr
+    email_type = EmailStr
+except ImportError:
+    email_type = str
 
 
 # Shared properties
 class UserBase(BaseModel):
-    email: Optional[EmailStr] = None
+    email: Optional[email_type] = None
     is_active: Optional[bool] = True
     is_superuser: bool = False
     full_name: Optional[str] = None
     
+    # Add email validation if using fallback str type
+    @validator('email')
+    def validate_email(cls, v):
+        if v is None:
+            return v
+            
+        if not isinstance(v, str):
+            return v
+            
+        # Basic email validation pattern
+        pattern = r'^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}$'
+        if not re.match(pattern, v):
+            raise ValueError('Invalid email format')
+        return v
+
 
 # Properties to receive via API on creation
 class UserCreate(UserBase):
-    email: EmailStr
+    email: email_type
     password: str
 
 

requirements.txt

@@ -7,5 +7,6 @@ pydantic-settings>=2.0.3
 python-jose[cryptography]>=3.3.0
 passlib[bcrypt]>=1.7.4
 python-multipart>=0.0.6
+email-validator>=2.0.0
 ruff>=0.1.3
 pytest>=7.4.3