#include <gtest/gtest.h>
#include <cstring>

// Include DDS types first
#include <api/dll.h>

// No TransTable dependencies needed in this file; remove legacy forward declarations.

namespace dds_test {

// Helper function to create a simple hand lookup table
static void CreateBasicHandLookup(int handLookup[15][15]) {
    for (int i = 0; i < 15; ++i) {
        for (int j = 0; j < 15; ++j) {
            handLookup[i][j] = (i + j) % 4; // Simple pattern
        }
    }
}

// Helper function to create test aggregate target
static void CreateTestAggrTarget(unsigned short aggrTarget[DDS_SUITS]) {
    aggrTarget[0] = 0x1111; // Spades
    aggrTarget[1] = 0x2222; // Hearts  
    aggrTarget[2] = 0x3333; // Diamonds
    aggrTarget[3] = 0x4444; // Clubs
}

// Helper function to create test win ranks
static void CreateTestWinRanks(unsigned short win_ranks[DDS_SUITS]) {
    win_ranks[0] = 0x5555; // Spades
    win_ranks[1] = 0x6666; // Hearts
    win_ranks[2] = 0x7777; // Diamonds  
    win_ranks[3] = 0x8888; // Clubs
}

// Test that verifies DDS constants are available
TEST(TransTableSBasicTest, DDSConstantsAvailable) {
    // Verify that basic DDS constants are accessible
    EXPECT_EQ(DDS_SUITS, 4);
    EXPECT_EQ(DDS_HANDS, 4);
    EXPECT_EQ(DDS_STRAINS, 5);
}

// Test that verifies we can work with basic DDS types
TEST(TransTableSBasicTest, BasicTypesWork) {
    // Test that we can create basic data structures
    unsigned short testArray[DDS_SUITS];
    for (int i = 0; i < DDS_SUITS; ++i) {
        testArray[i] = i * 0x1111;
    }
    
    EXPECT_EQ(testArray[0], 0x0000);
    EXPECT_EQ(testArray[1], 0x1111);
    EXPECT_EQ(testArray[2], 0x2222);
    EXPECT_EQ(testArray[3], 0x3333);
}

// Test helper functions work correctly
TEST(TransTableSBasicTest, HelperFunctionsWork) {
    int handLookup[15][15];
    CreateBasicHandLookup(handLookup);
    
    // Check that lookup table has expected pattern
    EXPECT_EQ(handLookup[0][0], 0);
    EXPECT_EQ(handLookup[1][0], 1);
    EXPECT_EQ(handLookup[0][1], 1);
    EXPECT_EQ(handLookup[1][1], 2);
    
    unsigned short aggrTarget[DDS_SUITS];
    CreateTestAggrTarget(aggrTarget);
    EXPECT_EQ(aggrTarget[0], 0x1111);
    EXPECT_EQ(aggrTarget[3], 0x4444);
    
    unsigned short win_ranks[DDS_SUITS];
    CreateTestWinRanks(win_ranks);
    EXPECT_EQ(win_ranks[0], 0x5555);
    EXPECT_EQ(win_ranks[3], 0x8888);
}

// Test data consistency for relative rank patterns
TEST(TransTableSAdvancedTest, RelativeRankPatterns) {
    // Test that we can create relative rank patterns
    unsigned short absoluteRanks[DDS_SUITS] = {0x1F00, 0x0F80, 0x07C0, 0x03E0}; // High cards
    unsigned short relativeRanks[DDS_SUITS] = {0x001F, 0x001F, 0x001F, 0x001F}; // Relative equivalent
    
    // Verify patterns are different but could represent equivalent positions
    EXPECT_NE(absoluteRanks[0], relativeRanks[0]);
    EXPECT_NE(absoluteRanks[1], relativeRanks[1]);
    
    // Both should have same number of bits set (same number of cards)
    auto countBits = [](unsigned short value) -> int {
        int count = 0;
        while (value) {
            count += value & 1;
            value >>= 1;
        }
        return count;
    };
    
    EXPECT_EQ(countBits(absoluteRanks[0]), countBits(relativeRanks[0]));
    EXPECT_EQ(countBits(absoluteRanks[1]), countBits(relativeRanks[1]));
}

// Test winning rank tracking logic
TEST(TransTableSAdvancedTest, WinningRankTracking) {
    // Test different winning patterns
    unsigned short singleSuitWin[DDS_SUITS] = {0x1000, 0x0000, 0x0000, 0x0000}; // Only spades
    unsigned short multiSuitWin[DDS_SUITS] = {0x1000, 0x0800, 0x0400, 0x0200};  // One from each
    
    // Verify winning patterns are correctly formed
    EXPECT_GT(singleSuitWin[0], 0);
    EXPECT_EQ(singleSuitWin[1], 0);
    EXPECT_EQ(singleSuitWin[2], 0);
    EXPECT_EQ(singleSuitWin[3], 0);
    
    EXPECT_GT(multiSuitWin[0], 0);
    EXPECT_GT(multiSuitWin[1], 0);
    EXPECT_GT(multiSuitWin[2], 0);
    EXPECT_GT(multiSuitWin[3], 0);
}

// Test hand distribution patterns
TEST(TransTableSAdvancedTest, HandDistributionPatterns) {
    // Test different hand distributions
    int balanced[4] = {3, 3, 3, 4};      // 3-3-3-4 distribution
    int unbalanced[4] = {7, 3, 2, 1};    // 7-3-2-1 distribution
    int voidSuit[4] = {0, 5, 4, 4};      // Void in one suit
    
    // Verify distributions sum to 13
    int sum1 = balanced[0] + balanced[1] + balanced[2] + balanced[3];
    int sum2 = unbalanced[0] + unbalanced[1] + unbalanced[2] + unbalanced[3];
    int sum3 = voidSuit[0] + voidSuit[1] + voidSuit[2] + voidSuit[3];
    
    EXPECT_EQ(sum1, 13);
    EXPECT_EQ(sum2, 13);
    EXPECT_EQ(sum3, 13);
    
    // Test void handling
    EXPECT_EQ(voidSuit[0], 0);
    EXPECT_GT(voidSuit[1], 0);
}

// Test edge case scenarios
TEST(TransTableSAdvancedTest, EdgeCaseScenarios) {
    // Test with extreme values
    unsigned short maxRanks[DDS_SUITS] = {0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF};
    unsigned short minRanks[DDS_SUITS] = {0x0000, 0x0000, 0x0000, 0x0000};
    unsigned short mixedRanks[DDS_SUITS] = {0xFFFF, 0x0000, 0xAAAA, 0x5555};
    
    // Verify extreme values don't cause issues
    EXPECT_EQ(maxRanks[0], 0xFFFF);
    EXPECT_EQ(minRanks[0], 0x0000);
    EXPECT_NE(mixedRanks[0], mixedRanks[1]);
    EXPECT_NE(mixedRanks[2], mixedRanks[3]);
}

// Test bounds checking logic
TEST(TransTableSAdvancedTest, BoundsCheckingLogic) {
    // Test different bound scenarios
    struct TestBounds {
        int ubound;
        int lbound;
        bool valid;
    };
    
    TestBounds testCases[] = {
        {10, 8, true},    // Valid: ubound > lbound
        {13, 0, true},    // Valid: maximum range
        {8, 8, true},     // Valid: equal bounds
        {7, 8, false},    // Invalid: ubound < lbound
        {14, 10, false},  // Invalid: ubound > 13
        {10, -1, false}   // Invalid: negative lbound
    };
    
    for (const auto& test : testCases) {
        bool isValid = (test.ubound >= test.lbound) && 
                      (test.ubound >= 0 && test.ubound <= 13) &&
                      (test.lbound >= 0 && test.lbound <= 13);
        EXPECT_EQ(isValid, test.valid) 
            << "Bounds check failed for ubound=" << (int)test.ubound 
            << " lbound=" << (int)test.lbound;
    }
}

// Test memory management scenarios
TEST(TransTableSAdvancedTest, MemoryManagementScenarios) {
    // Test different memory scenarios without actual allocation
    
    // Simulate memory limits
    struct MemoryLimits {
        int defaultMB;
        int maximumMB;
        bool shouldSucceed;
    };
    
    MemoryLimits testCases[] = {
        {16, 32, true},    // Normal case
        {1, 2, true},      // Very small
        {128, 256, true},  // Large
        {0, 0, true},      // Zero (should use defaults)
        {32, 16, false},   // Invalid: default > maximum
    };
    
    for (const auto& test : testCases) {
        bool isValid = (test.defaultMB <= test.maximumMB) && 
                      (test.defaultMB >= 0) && 
                      (test.maximumMB >= 0);
        EXPECT_EQ(isValid, test.shouldSucceed)
            << "Memory limit check failed for default=" << test.defaultMB
            << " maximum=" << test.maximumMB;
    }
}

// Test data validation for transposition table entries
TEST(TransTableSAdvancedTest, DataValidationLogic) {
    // Test validation of transposition table entry data
    struct TTEntryData {
        int tricks;
        int bound_type;
        bool valid;
    };
    
    TTEntryData testCases[] = {
        {0, 1, true},     // Valid: tricks 0-13, bound type 1-3
        {13, 3, true},    // Valid: maximum tricks, maximum bound
        {6, 2, true},     // Valid: normal case
        {14, 1, false},   // Invalid: tricks > 13
        {-1, 1, false},   // Invalid: negative tricks
        {6, 0, false},    // Invalid: bound type 0
        {6, 4, false},    // Invalid: bound type > 3
    };
    
    for (const auto& test : testCases) {
        bool isValid = (test.tricks >= 0 && test.tricks <= 13) &&
                      (test.bound_type >= 1 && test.bound_type <= 3);
        EXPECT_EQ(isValid, test.valid)
            << "Data validation failed for tricks=" << (int)test.tricks
            << " bound_type=" << (int)test.bound_type;
    }
}

// Test performance characteristics without actual timing
TEST(TransTableSAdvancedTest, PerformanceCharacteristics) {
    // Test that we can simulate performance scenarios
    
    // Simulate different access patterns
    struct AccessPattern {
        int sequential_accesses;
        int random_accesses;
        double expected_efficiency; // 0.0 to 1.0
    };
    
    AccessPattern patterns[] = {
        {1000, 0, 0.95},      // Highly sequential
        {500, 500, 0.70},     // Mixed
        {0, 1000, 0.50},      // Highly random
        {100, 100, 0.80},     // Small mixed
    };
    
    for (const auto& pattern : patterns) {
        // Simulate efficiency calculation
        double total_accesses = pattern.sequential_accesses + pattern.random_accesses;
        double sequential_ratio = pattern.sequential_accesses / total_accesses;
        double simulated_efficiency = 0.5 + (sequential_ratio * 0.45); // Simple model
        
        // Check that our model produces reasonable results
        EXPECT_GE(simulated_efficiency, 0.0);
        EXPECT_LE(simulated_efficiency, 1.0);
        EXPECT_TRUE(std::abs(simulated_efficiency - pattern.expected_efficiency) < 0.3)
            << "Efficiency simulation failed for pattern with " 
            << pattern.sequential_accesses << " sequential, "
            << pattern.random_accesses << " random accesses";
    }
}

} // namespace dds_test
