#!/usr/bin/env python3
"""
Unit tests specifically for user_id validation in models

This test file focuses on comprehensive validation testing for the user_id field
across all analytics models (Session, Message, SearchAnalytics).
"""

import sys
import os
sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))

# Load environment variables
try:
    from dotenv import load_dotenv
    load_dotenv()
except ImportError:
    pass  # dotenv not available, continue without it

import unittest
from pydantic import ValidationError
from analytics.models import Session, Message, SearchAnalytics


class TestSessionUserIdValidation:
    """Test user_id validation in Session model"""
    
    def test_valid_user_ids(self):
        """Test all valid user_id formats"""
        valid_user_ids = [
            "user123",
            "user_123",
            "user-123",
            "user_123-test",
            "123user",
            "a",  # Single character
            "a" * 255,  # Maximum length
            None,  # Anonymous user
        ]
        
        for user_id in valid_user_ids:
            session = Session(user_id=user_id)
            assert session.user_id == user_id
    
    def test_empty_string_becomes_none(self):
        """Test that empty strings are converted to None"""
        test_cases = ["", "   ", "\t", "\n", "  \t\n  "]
        
        for empty_value in test_cases:
            session = Session(user_id=empty_value)
            assert session.user_id is None
    
    def test_invalid_user_id_types(self):
        """Test that non-string types raise ValidationError"""
        invalid_types = [123, 45.67, True, [], {}, object()]
        
        for invalid_type in invalid_types:
            try:
                Session(user_id=invalid_type)
                assert False, f"Should have raised ValidationError for {invalid_type}"
            except Exception as e:
                # Accept either ValueError or ValidationError
                error_msg = str(e).lower()
                assert ("user_id must be a string" in error_msg or 
                       "string_type" in error_msg or 
                       "should be a valid string" in error_msg), f"Unexpected error: {e}"
    
    def test_user_id_too_long(self):
        """Test that user_id longer than 255 characters raises ValidationError"""
        long_user_id = "a" * 256
        
        try:
            Session(user_id=long_user_id)
            assert False, "Should have raised ValueError for too long user_id"
        except Exception as e:
            error_msg = str(e).lower()
            assert ("user_id must be 255 characters or less" in error_msg or 
                   "255" in error_msg), f"Unexpected error: {e}"
    
    def test_invalid_characters(self):
        """Test that invalid characters raise ValidationError"""
        invalid_user_ids = [
            "user@123",      # @ symbol
            "user 123",      # space
            "user.123",      # period
            "user#123",      # hash
            "user$123",      # dollar sign
            "user%123",      # percent
            "user&123",      # ampersand
            "user*123",      # asterisk
            "user+123",      # plus
            "user=123",      # equals
            "user[123]",     # brackets
            "user{123}",     # braces
            "user|123",      # pipe
            "user\\123",     # backslash
            "user/123",      # forward slash
            "user:123",      # colon
            "user;123",      # semicolon
            "user<123>",     # angle brackets
            "user?123",      # question mark
            "user,123",      # comma
            "user'123",      # single quote
            'user"123',      # double quote
            "user`123",      # backtick
            "user~123",      # tilde
            "user!123",      # exclamation
        ]
        
        for invalid_user_id in invalid_user_ids:
            try:
                Session(user_id=invalid_user_id)
                assert False, f"Should have raised ValueError for {invalid_user_id}"
            except Exception as e:
                error_msg = str(e).lower()
                assert ("user_id can only contain alphanumeric characters" in error_msg or 
                       "alphanumeric" in error_msg), f"Unexpected error for {invalid_user_id}: {e}"
    
    def test_unicode_characters(self):
        """Test that unicode characters are rejected"""
        unicode_user_ids = [
            "user123é",      # Accented character
            "user123ñ",      # Spanish character
            "user123中",      # Chinese character
            "user123🚀",      # Emoji
            "user123α",      # Greek character
        ]
        
        for unicode_user_id in unicode_user_ids:
            try:
                Session(user_id=unicode_user_id)
                assert False, f"Should have raised ValueError for {unicode_user_id}"
            except Exception as e:
                error_msg = str(e).lower()
                assert ("user_id can only contain alphanumeric characters" in error_msg or 
                       "alphanumeric" in error_msg), f"Unexpected error for {unicode_user_id}: {e}"
    
    def test_edge_cases(self):
        """Test edge cases for user_id validation"""
        # Test exactly 255 characters (should pass)
        max_length_user_id = "a" * 255
        session = Session(user_id=max_length_user_id)
        assert session.user_id == max_length_user_id
        
        # Test mixed valid characters
        mixed_user_id = "user123_test-456"
        session = Session(user_id=mixed_user_id)
        assert session.user_id == mixed_user_id
        
        # Test all numbers
        numeric_user_id = "123456789"
        session = Session(user_id=numeric_user_id)
        assert session.user_id == numeric_user_id
        
        # Test all underscores and hyphens
        special_user_id = "___---___"
        session = Session(user_id=special_user_id)
        assert session.user_id == special_user_id


class TestMessageUserIdValidation:
    """Test user_id validation in Message model"""
    
    def test_valid_user_ids(self):
        """Test valid user_id values in Message model"""
        valid_user_ids = ["user123", "user_123", "user-123", None]
        
        for user_id in valid_user_ids:
            message = Message(
                session_id="test_session",
                prompt_length=50,
                response_length=100,
                response_time_ms=1000,
                user_id=user_id
            )
            assert message.user_id == user_id
    
    def test_invalid_user_ids(self):
        """Test invalid user_id values in Message model"""
        try:
            Message(
                session_id="test_session",
                prompt_length=50,
                response_length=100,
                response_time_ms=1000,
                user_id=123
            )
            assert False, "Should have raised ValueError for non-string user_id"
        except Exception as e:
            error_msg = str(e).lower()
            assert ("user_id must be a string" in error_msg or 
                   "string_type" in error_msg or 
                   "should be a valid string" in error_msg), f"Unexpected error: {e}"
        
        try:
            Message(
                session_id="test_session",
                prompt_length=50,
                response_length=100,
                response_time_ms=1000,
                user_id="user@123"
            )
            assert False, "Should have raised ValueError for invalid characters"
        except Exception as e:
            error_msg = str(e).lower()
            assert ("user_id can only contain alphanumeric characters" in error_msg or 
                   "alphanumeric" in error_msg), f"Unexpected error: {e}"
    
    def test_empty_string_handling(self):
        """Test empty string handling in Message model"""
        message = Message(
            session_id="test_session",
            prompt_length=50,
            response_length=100,
            response_time_ms=1000,
            user_id=""
        )
        assert message.user_id is None


class TestSearchAnalyticsUserIdValidation:
    """Test user_id validation in SearchAnalytics model"""
    
    def test_valid_user_ids(self):
        """Test valid user_id values in SearchAnalytics model"""
        valid_user_ids = ["user123", "user_123", "user-123", None]
        
        for user_id in valid_user_ids:
            search = SearchAnalytics(
                message_id="test_message",
                search_query="test query",
                user_id=user_id
            )
            assert search.user_id == user_id
    
    def test_invalid_user_ids(self):
        """Test invalid user_id values in SearchAnalytics model"""
        try:
            SearchAnalytics(
                message_id="test_message",
                search_query="test query",
                user_id=123
            )
            assert False, "Should have raised ValueError for non-string user_id"
        except Exception as e:
            error_msg = str(e).lower()
            assert ("user_id must be a string" in error_msg or 
                   "string_type" in error_msg or 
                   "should be a valid string" in error_msg), f"Unexpected error: {e}"
        
        try:
            SearchAnalytics(
                message_id="test_message",
                search_query="test query",
                user_id="user@123"
            )
            assert False, "Should have raised ValueError for invalid characters"
        except Exception as e:
            error_msg = str(e).lower()
            assert ("user_id can only contain alphanumeric characters" in error_msg or 
                   "alphanumeric" in error_msg), f"Unexpected error: {e}"
    
    def test_empty_string_handling(self):
        """Test empty string handling in SearchAnalytics model"""
        search = SearchAnalytics(
            message_id="test_message",
            search_query="test query",
            user_id=""
        )
        assert search.user_id is None


class TestModelToDictSerialization:
    """Test that to_dict() methods properly include user_id"""
    
    def test_session_to_dict_with_user_id(self):
        """Test Session.to_dict() includes user_id"""
        session = Session(user_id="user123")
        session_dict = session.to_dict()
        
        assert "user_id" in session_dict
        assert session_dict["user_id"] == "user123"
        assert session_dict["_id"] == session.session_id
    
    def test_session_to_dict_without_user_id(self):
        """Test Session.to_dict() includes user_id as None"""
        session = Session(user_id=None)
        session_dict = session.to_dict()
        
        assert "user_id" in session_dict
        assert session_dict["user_id"] is None
    
    def test_message_to_dict_with_user_id(self):
        """Test Message.to_dict() includes user_id"""
        message = Message(
            session_id="test_session",
            prompt_length=50,
            response_length=100,
            response_time_ms=1000,
            user_id="user123"
        )
        message_dict = message.to_dict()
        
        assert "user_id" in message_dict
        assert message_dict["user_id"] == "user123"
        assert message_dict["_id"] == message.message_id
    
    def test_message_to_dict_without_user_id(self):
        """Test Message.to_dict() includes user_id as None"""
        message = Message(
            session_id="test_session",
            prompt_length=50,
            response_length=100,
            response_time_ms=1000,
            user_id=None
        )
        message_dict = message.to_dict()
        
        assert "user_id" in message_dict
        assert message_dict["user_id"] is None
    
    def test_search_analytics_to_dict_with_user_id(self):
        """Test SearchAnalytics.to_dict() includes user_id"""
        search = SearchAnalytics(
            message_id="test_message",
            search_query="test query",
            user_id="user123"
        )
        search_dict = search.to_dict()
        
        assert "user_id" in search_dict
        assert search_dict["user_id"] == "user123"
        assert search_dict["_id"] == search.search_id
    
    def test_search_analytics_to_dict_without_user_id(self):
        """Test SearchAnalytics.to_dict() includes user_id as None"""
        search = SearchAnalytics(
            message_id="test_message",
            search_query="test query",
            user_id=None
        )
        search_dict = search.to_dict()
        
        assert "user_id" in search_dict
        assert search_dict["user_id"] is None


def run_validation_tests():
    """Run all validation tests"""
    print("🧪 Running User ID Validation Tests")
    print("=" * 50)
    
    # Test Session validation
    session_test = TestSessionUserIdValidation()
    session_test.test_valid_user_ids()
    session_test.test_empty_string_becomes_none()
    session_test.test_invalid_user_id_types()
    session_test.test_user_id_too_long()
    session_test.test_invalid_characters()
    session_test.test_unicode_characters()
    session_test.test_edge_cases()
    print("✅ Session user_id validation tests passed")
    
    # Test Message validation
    message_test = TestMessageUserIdValidation()
    message_test.test_valid_user_ids()
    message_test.test_invalid_user_ids()
    message_test.test_empty_string_handling()
    print("✅ Message user_id validation tests passed")
    
    # Test SearchAnalytics validation
    search_test = TestSearchAnalyticsUserIdValidation()
    search_test.test_valid_user_ids()
    search_test.test_invalid_user_ids()
    search_test.test_empty_string_handling()
    print("✅ SearchAnalytics user_id validation tests passed")
    
    # Test to_dict serialization
    dict_test = TestModelToDictSerialization()
    dict_test.test_session_to_dict_with_user_id()
    dict_test.test_session_to_dict_without_user_id()
    dict_test.test_message_to_dict_with_user_id()
    dict_test.test_message_to_dict_without_user_id()
    dict_test.test_search_analytics_to_dict_with_user_id()
    dict_test.test_search_analytics_to_dict_without_user_id()
    print("✅ Model to_dict serialization tests passed")
    
    print("\n🎉 ALL VALIDATION TESTS PASSED!")


if __name__ == "__main__":
    run_validation_tests()