#pragma once

#include <cassert>
#include <stdexcept>
#include <string_view>
#include <source_location>
#include <cmath>

// =============================================================================
// WARFACTORY CONTRACT-BASED PROGRAMMING
// Simulation des contracts C++20 + fail-fast patterns
// =============================================================================

namespace warfactory::contracts {

// =============================================================================
// CONTRACT VIOLATION HANDLING
// =============================================================================

class ContractViolation : public std::logic_error {
public:
    ContractViolation(const std::string& message,
                     const std::source_location& location = std::source_location::current())
        : std::logic_error(format_message(message, location)) {}

private:
    static std::string format_message(const std::string& message,
                                    const std::source_location& location) {
        return std::string("CONTRACT VIOLATION: ") + message +
               " at " + location.file_name() + ":" + std::to_string(location.line());
    }
};

// =============================================================================
// FAIL-FAST MACROS
// =============================================================================

#ifdef WARFACTORY_FAIL_FAST

// Terminate immédiatement sur condition impossible
#define WARFACTORY_UNREACHABLE() \
    do { \
        fprintf(stderr, "UNREACHABLE CODE at %s:%d\n", __FILE__, __LINE__); \
        std::terminate(); \
    } while(0)

// Crash immédiat vs corruption silencieuse
#define WARFACTORY_FAIL_FAST_IF(condition) \
    do { \
        if (__builtin_expect(!!(condition), 0)) { \
            fprintf(stderr, "FAIL-FAST TRIGGERED: %s at %s:%d\n", #condition, __FILE__, __LINE__); \
            std::terminate(); \
        } \
    } while(0)

#else
#define WARFACTORY_UNREACHABLE() ((void)0)
#define WARFACTORY_FAIL_FAST_IF(condition) ((void)0)
#endif

// =============================================================================
// PRECONDITIONS
// =============================================================================

#ifdef WARFACTORY_PRECONDITION_ENABLED

#define WARFACTORY_PRECONDITION(condition, message) \
    do { \
        if (__builtin_expect(!(condition), 0)) { \
            throw warfactory::contracts::ContractViolation( \
                "PRECONDITION FAILED: " #condition " - " message); \
        } \
    } while(0)

#define WARFACTORY_REQUIRE(condition) \
    WARFACTORY_PRECONDITION(condition, "Requirement not met")

#define WARFACTORY_REQUIRE_NOT_NULL(ptr) \
    WARFACTORY_PRECONDITION((ptr) != nullptr, "Pointer must not be null")

#define WARFACTORY_REQUIRE_IN_RANGE(value, min, max) \
    WARFACTORY_PRECONDITION((value) >= (min) && (value) <= (max), "Value must be in range")

#else
#define WARFACTORY_PRECONDITION(condition, message) ((void)0)
#define WARFACTORY_REQUIRE(condition) ((void)0)
#define WARFACTORY_REQUIRE_NOT_NULL(ptr) ((void)0)
#define WARFACTORY_REQUIRE_IN_RANGE(value, min, max) ((void)0)
#endif

// =============================================================================
// POSTCONDITIONS
// =============================================================================

#ifdef WARFACTORY_POSTCONDITION_ENABLED

#define WARFACTORY_POSTCONDITION(condition, message) \
    do { \
        if (__builtin_expect(!(condition), 0)) { \
            throw warfactory::contracts::ContractViolation( \
                "POSTCONDITION FAILED: " #condition " - " message); \
        } \
    } while(0)

#define WARFACTORY_ENSURE(condition) \
    WARFACTORY_POSTCONDITION(condition, "Postcondition not met")

#define WARFACTORY_ENSURE_NOT_NULL(ptr) \
    WARFACTORY_POSTCONDITION((ptr) != nullptr, "Return value must not be null")

#else
#define WARFACTORY_POSTCONDITION(condition, message) ((void)0)
#define WARFACTORY_ENSURE(condition) ((void)0)
#define WARFACTORY_ENSURE_NOT_NULL(ptr) ((void)0)
#endif

// =============================================================================
// INVARIANTS
// =============================================================================

#ifdef WARFACTORY_ASSERT_ENABLED

#define WARFACTORY_ASSERT(condition, message) \
    do { \
        if (__builtin_expect(!(condition), 0)) { \
            throw warfactory::contracts::ContractViolation( \
                "ASSERTION FAILED: " #condition " - " message); \
        } \
    } while(0)

#define WARFACTORY_INVARIANT(condition) \
    WARFACTORY_ASSERT(condition, "Class invariant violated")

#else
#define WARFACTORY_ASSERT(condition, message) ((void)0)
#define WARFACTORY_INVARIANT(condition) ((void)0)
#endif

// =============================================================================
// INPUT/OUTPUT VALIDATION
// =============================================================================

#ifdef WARFACTORY_VALIDATE_ALL_INPUTS

#define WARFACTORY_VALIDATE_INPUT(condition, message) \
    WARFACTORY_PRECONDITION(condition, "INPUT VALIDATION: " message)

#define WARFACTORY_VALIDATE_JSON_SCHEMA(json, schema) \
    do { \
        if (!validate_json_against_schema(json, schema)) { \
            throw warfactory::contracts::ContractViolation("JSON schema validation failed"); \
        } \
    } while(0)

#else
#define WARFACTORY_VALIDATE_INPUT(condition, message) ((void)0)
#define WARFACTORY_VALIDATE_JSON_SCHEMA(json, schema) ((void)0)
#endif

#ifdef WARFACTORY_VALIDATE_ALL_OUTPUTS

#define WARFACTORY_VALIDATE_OUTPUT(condition, message) \
    WARFACTORY_POSTCONDITION(condition, "OUTPUT VALIDATION: " message)

#else
#define WARFACTORY_VALIDATE_OUTPUT(condition, message) ((void)0)
#endif

// =============================================================================
// PROPERTY-BASED TESTING MACROS
// =============================================================================

#ifdef WARFACTORY_PROPERTY_TESTING

#define WARFACTORY_PROPERTY(name, ...) \
    namespace { \
        struct Property_##name { \
            static void test(__VA_ARGS__); \
        }; \
    } \
    void Property_##name::test(__VA_ARGS__)

#define WARFACTORY_CHECK_PROPERTY(condition) \
    do { \
        if (!(condition)) { \
            throw std::runtime_error("Property violation: " #condition); \
        } \
    } while(0)

// Propriétés communes pour le business domain
#define WARFACTORY_PROPERTY_CONSERVATION_OF_MASS(input, output) \
    WARFACTORY_CHECK_PROPERTY(std::abs((input) - (output)) < 1e-6)

#define WARFACTORY_PROPERTY_FINITE_VALUES(value) \
    WARFACTORY_CHECK_PROPERTY(std::isfinite(value))

#else
#define WARFACTORY_PROPERTY(name, ...)
#define WARFACTORY_CHECK_PROPERTY(condition) ((void)0)
#define WARFACTORY_PROPERTY_CONSERVATION_OF_MASS(input, output) ((void)0)
#define WARFACTORY_PROPERTY_FINITE_VALUES(value) ((void)0)
#endif

} // namespace warfactory::contracts

// =============================================================================
// HELPER FUNCTIONS FOR RUNTIME VALIDATION
// =============================================================================

namespace warfactory::validation {

// JSON Schema validation placeholder
inline bool validate_json_against_schema(const std::string& json, const std::string& schema) {
    // TODO: Intégrer avec nlohmann::json validator ou équivalent
    return true; // Placeholder
}

// Runtime health checks
inline void perform_health_check() {
    // TODO: Vérifier état des engines, mémoire, etc.
}

// Memory usage monitoring
inline size_t get_current_memory_usage() {
    // TODO: Implémenter monitoring mémoire
    return 0; // Placeholder
}

} // namespace warfactory::validation