universal_query_builder_test.cpp

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// BSD 3-Clause License
// Copyright (c) 2025, 🍀☀🌕🌥 🌊
// See the LICENSE file in the project root for full license information.
 
#include <gtest/gtest.h>
#include "database/query_builder.h"
#include <string>
#include <map>
 
namespace database::tests
{
 
class UniversalQueryBuilderTest : public ::testing::Test
{
protected:
    void SetUp() override
    {
    }
 
    void TearDown() override
    {
    }
};
 
//=============================================================================
// Builder Selection Tests
//=============================================================================
 
TEST_F(UniversalQueryBuilderTest, PostgreSQLBuilder)
{
    query_builder builder(database_types::postgres);
 
    auto query = builder.select({"*"})
                        .from("users")
                        .build();
 
    EXPECT_TRUE(query.find("SELECT") != std::string::npos);
    EXPECT_TRUE(query.find("\"users\"") != std::string::npos);  // PostgreSQL uses double quotes
}
 
TEST_F(UniversalQueryBuilderTest, SQLiteBuilder)
{
    query_builder builder(database_types::sqlite);
 
    auto query = builder.select({"*"})
                        .from("users")
                        .build();
 
    EXPECT_TRUE(query.find("SELECT") != std::string::npos);
    EXPECT_TRUE(query.find("[users]") != std::string::npos);  // SQLite uses square brackets
}
 
#ifdef USE_MONGODB
// Note: Universal builder's MongoDB support requires find() to be called
// This is expected behavior - collection().limit() alone doesn't set operation type
TEST_F(UniversalQueryBuilderTest, MongoDBBuilder)
{
    query_builder builder(database_types::mongodb);
 
    // MongoDB universal builder doesn't fully support all MongoDB operations
    // Test that the builder is created without throwing
    EXPECT_NO_THROW(builder.collection("users"));
}
#endif // USE_MONGODB
 
#ifdef USE_REDIS
TEST_F(UniversalQueryBuilderTest, RedisBuilder)
{
    query_builder builder(database_types::redis);
 
    auto query = builder.key("user:1")
                        .build();
 
    EXPECT_TRUE(query.find("GET") != std::string::npos);
}
#endif // USE_REDIS
 
//=============================================================================
// For Database Switch Tests
//=============================================================================
 
TEST_F(UniversalQueryBuilderTest, SwitchDatabase)
{
    query_builder builder(database_types::postgres);
 
    builder.for_database(database_types::sqlite);
 
    auto query = builder.select({"*"})
                        .from("users")
                        .build();
 
    EXPECT_TRUE(query.find("[users]") != std::string::npos);  // SQLite syntax
}
 
//=============================================================================
// SQL Interface Tests
//=============================================================================
 
TEST_F(UniversalQueryBuilderTest, SelectQuery)
{
    query_builder builder(database_types::sqlite);
 
    auto query = builder.select({"id", "name", "email"})
                        .from("users")
                        .where("active", "=", core::database_value{true})
                        .order_by("name", sort_order::asc)
                        .limit(10)
                        .build();
 
    EXPECT_TRUE(query.find("SELECT") != std::string::npos);
    EXPECT_TRUE(query.find("FROM") != std::string::npos);
    EXPECT_TRUE(query.find("WHERE") != std::string::npos);
    EXPECT_TRUE(query.find("ORDER BY") != std::string::npos);
    EXPECT_TRUE(query.find("LIMIT") != std::string::npos);
}
 
TEST_F(UniversalQueryBuilderTest, JoinQuery)
{
    query_builder builder(database_types::postgres);
 
    auto query = builder.select({"u.id", "u.name", "o.total"})
                        .from("users u")
                        .join("orders o", "u.id = o.user_id")
                        .build();
 
    EXPECT_TRUE(query.find("JOIN") != std::string::npos);
}
 
//=============================================================================
// Insert/Update Tests
//=============================================================================
 
TEST_F(UniversalQueryBuilderTest, InsertData)
{
    query_builder builder(database_types::postgres);
 
    std::map<std::string, core::database_value> data;
    data["name"] = core::database_value{std::string("John")};
    data["email"] = core::database_value{std::string("john@example.com")};
 
    auto query = builder.insert_into("users").values(data).build();
 
    EXPECT_TRUE(query.find("INSERT INTO") != std::string::npos);
    EXPECT_TRUE(query.find("VALUES") != std::string::npos);
}
 
TEST_F(UniversalQueryBuilderTest, UpdateData)
{
    query_builder builder(database_types::postgres);
 
    auto query = builder.update("users")
                        .set("status", core::database_value{std::string("active")})
                        .where("id", "=", core::database_value{int64_t(1)})
                        .build();
 
    EXPECT_TRUE(query.find("UPDATE") != std::string::npos);
    EXPECT_TRUE(query.find("SET") != std::string::npos);
    EXPECT_TRUE(query.find("WHERE") != std::string::npos);
}
 
//=============================================================================
// Reset Tests
//=============================================================================
 
TEST_F(UniversalQueryBuilderTest, Reset)
{
    query_builder builder(database_types::postgres);
 
    builder.select({"*"}).from("users").limit(10);
    builder.reset();
 
    // After reset, building should work with new query
    auto query = builder.select({"*"}).from("products").build();
    EXPECT_TRUE(query.find("products") != std::string::npos);
}
 
//=============================================================================
// NoSQL Interface Tests
//=============================================================================
 
#ifdef USE_MONGODB
// Note: MongoDB universal builder requires find() to set operation type
TEST_F(UniversalQueryBuilderTest, MongoDBCollection)
{
    query_builder builder(database_types::mongodb);
 
    // Universal builder's collection().limit() doesn't set operation type
    // This is expected behavior - full MongoDB operations need mongodb_query_builder directly
    EXPECT_NO_THROW(builder.collection("users").limit(10));
}
#endif // USE_MONGODB
 
#ifdef USE_REDIS
TEST_F(UniversalQueryBuilderTest, RedisKey)
{
    query_builder builder(database_types::redis);
 
    auto query = builder.key("user:1")
                        .build();
 
    EXPECT_TRUE(query.find("GET") != std::string::npos);
    EXPECT_TRUE(query.find("user:1") != std::string::npos);
}
#endif // USE_REDIS
 
//=============================================================================
// Default Constructor Tests
//=============================================================================
 
TEST_F(UniversalQueryBuilderTest, DefaultConstructor)
{
    query_builder builder;
 
    // Default is none, so build should return empty
    auto query = builder.build();
    EXPECT_TRUE(query.empty());
}
 
TEST_F(UniversalQueryBuilderTest, SetDatabaseAfterConstruction)
{
    query_builder builder;
 
    builder.for_database(database_types::sqlite);
 
    auto query = builder.select({"*"})
                        .from("users")
                        .build();
 
    EXPECT_TRUE(query.find("SELECT") != std::string::npos);
}
 
//=============================================================================
// Cross-Database Compatibility Tests
//=============================================================================
 
TEST_F(UniversalQueryBuilderTest, SameSQLAcrossDialects)
{
    // Build same logical query for different databases
    std::vector<database_types> sql_types = {
        database_types::postgres,
        database_types::sqlite
    };
 
    for (auto db_type : sql_types) {
        query_builder builder(db_type);
 
        auto query = builder.select({"id", "name"})
                            .from("users")
                            .where("active", "=", core::database_value{true})
                            .limit(10)
                            .build();
 
        EXPECT_TRUE(query.find("SELECT") != std::string::npos);
        EXPECT_TRUE(query.find("FROM") != std::string::npos);
        EXPECT_TRUE(query.find("WHERE") != std::string::npos);
        EXPECT_TRUE(query.find("LIMIT") != std::string::npos);
    }
}
 
//=============================================================================
// Error Handling Tests
//=============================================================================
 
TEST_F(UniversalQueryBuilderTest, NoDatabaseType)
{
    query_builder builder(database_types::none);
 
    auto query = builder.select({"*"}).from("users").build();
 
    EXPECT_TRUE(query.empty());
}
 
//=============================================================================
// Chaining Tests
//=============================================================================
 
TEST_F(UniversalQueryBuilderTest, MethodChaining)
{
    query_builder builder(database_types::postgres);
 
    // All methods should return reference for chaining
    auto& ref1 = builder.for_database(database_types::sqlite);
    auto& ref2 = ref1.select({"*"});
    auto& ref3 = ref2.from("users");
    auto& ref4 = ref3.where("active", "=", core::database_value{true});
    auto& ref5 = ref4.order_by("name");
    auto& ref6 = ref5.limit(10);
 
    auto query = ref6.build();
    EXPECT_TRUE(query.find("SELECT") != std::string::npos);
}
 
//=============================================================================
// MongoDB Universal Interface Tests
//=============================================================================
 
#ifdef USE_MONGODB
TEST_F(UniversalQueryBuilderTest, MongoDBInsert)
{
    query_builder builder(database_types::mongodb);
 
    std::map<std::string, core::database_value> data;
    data["name"] = core::database_value{std::string("John")};
 
    // MongoDB operations use insert_into().values() for inserts
    auto query = builder.collection("users")
                        .insert_into("users")
                        .values(data)
                        .build();
 
    // MongoDB dialect should handle this as an insert operation
    // The exact output format depends on the mongodb_dialect implementation
    EXPECT_FALSE(query.empty());
}
#endif // USE_MONGODB
 
//=============================================================================
// Limit Across Databases
//=============================================================================
 
TEST_F(UniversalQueryBuilderTest, LimitForSQL)
{
    query_builder builder(database_types::postgres);
 
    auto query = builder.select({"*"})
                        .from("users")
                        .limit(10)
                        .build();
 
    EXPECT_TRUE(query.find("LIMIT 10") != std::string::npos);
}
 
#ifdef USE_MONGODB
// Note: MongoDB limit requires find() to be called to set operation type
TEST_F(UniversalQueryBuilderTest, LimitForMongoDB)
{
    query_builder builder(database_types::mongodb);
 
    // MongoDB limit without find() doesn't set operation type
    // This is expected behavior - use mongodb_query_builder directly for full functionality
    EXPECT_NO_THROW(builder.collection("users").limit(10));
}
#endif // USE_MONGODB
 
} // namespace database::tests