// ================================================================================================
// Audio Backend - 音频配置测试
// ================================================================================================

#include <gtest/gtest.h>
#include "engine/audio_buffer.h"
#include "tests/common/test_fixtures.h"

using namespace audio_backend;
using namespace audio_backend::engine;

// 基本测试固定装置
class AudioConfigTest : public test::BaseTest {};

// 测试音频配置的默认值
TEST_F(AudioConfigTest, DefaultValues) {
    AudioConfig config;
    
    EXPECT_EQ(config.sample_rate, 48000);
    EXPECT_EQ(config.channels, 2);
    EXPECT_EQ(config.format, AudioFormat::FLOAT32);
    EXPECT_EQ(config.frames_per_buffer, 512);
}

// 测试音频配置的有效性验证
TEST_F(AudioConfigTest, Validation) {
    AudioConfig config;
    EXPECT_TRUE(config.is_valid());
    
    // 无效采样率
    {
        AudioConfig invalid_config = config;
        invalid_config.sample_rate = 0;
        EXPECT_FALSE(invalid_config.is_valid());
        
        invalid_config.sample_rate = 200000; // 超过最大值
        EXPECT_FALSE(invalid_config.is_valid());
    }
    
    // 无效声道数
    {
        AudioConfig invalid_config = config;
        invalid_config.channels = 0;
        EXPECT_FALSE(invalid_config.is_valid());
        
        invalid_config.channels = 33; // 超过最大值
        EXPECT_FALSE(invalid_config.is_valid());
    }
    
    // 无效格式
    {
        AudioConfig invalid_config = config;
        invalid_config.format = AudioFormat::UNKNOWN;
        EXPECT_FALSE(invalid_config.is_valid());
    }
    
    // 无效帧数
    {
        AudioConfig invalid_config = config;
        invalid_config.frames_per_buffer = 0;
        EXPECT_FALSE(invalid_config.is_valid());
        
        invalid_config.frames_per_buffer = 9000; // 超过最大值
        EXPECT_FALSE(invalid_config.is_valid());
    }
    
    // 边界值测试
    {
        AudioConfig boundary_config = config;
        
        // 最小有效值
        boundary_config.sample_rate = 1;
        boundary_config.channels = 1;
        boundary_config.frames_per_buffer = 1;
        EXPECT_TRUE(boundary_config.is_valid());
        
        // 最大有效值
        boundary_config.sample_rate = 192000;
        boundary_config.channels = 32;
        boundary_config.frames_per_buffer = 8192;
        EXPECT_TRUE(boundary_config.is_valid());
    }
}

// 测试缓冲区大小计算
TEST_F(AudioConfigTest, BufferSizeCalculation) {
    AudioConfig config;
    
    // 默认配置: 512帧 * 2声道 * 4字节(FLOAT32) = 4096字节
    EXPECT_EQ(config.get_buffer_size_bytes(), 4096);
    EXPECT_EQ(config.get_buffer_size_samples(), 1024);
    
    // 修改配置
    config.frames_per_buffer = 256;
    EXPECT_EQ(config.get_buffer_size_bytes(), 2048);
    EXPECT_EQ(config.get_buffer_size_samples(), 512);
    
    config.channels = 4;
    EXPECT_EQ(config.get_buffer_size_bytes(), 4096);
    EXPECT_EQ(config.get_buffer_size_samples(), 1024);
    
    config.format = AudioFormat::INT16;
    EXPECT_EQ(config.get_buffer_size_bytes(), 2048);
    EXPECT_EQ(config.get_buffer_size_samples(), 1024);
    
    config.format = AudioFormat::FLOAT64;
    EXPECT_EQ(config.get_buffer_size_bytes(), 8192);
    EXPECT_EQ(config.get_buffer_size_samples(), 1024);
}

// 测试延迟计算
TEST_F(AudioConfigTest, LatencyCalculation) {
    AudioConfig config;
    
    // 默认配置: 512帧 / 48000Hz * 1000 = 10.667毫秒
    EXPECT_NEAR(config.get_latency_ms(), 10.667, 0.001);
    
    // 修改配置
    config.frames_per_buffer = 256;
    EXPECT_NEAR(config.get_latency_ms(), 5.333, 0.001);
    
    config.sample_rate = 96000;
    EXPECT_NEAR(config.get_latency_ms(), 2.667, 0.001);
    
    config.frames_per_buffer = 1024;
    EXPECT_NEAR(config.get_latency_ms(), 10.667, 0.001);
}

// 测试比较操作符
TEST_F(AudioConfigTest, ComparisonOperators) {
    AudioConfig config1;
    AudioConfig config2;
    
    // 相等配置
    EXPECT_EQ(config1, config2);
    EXPECT_FALSE(config1 != config2);
    
    // 不同采样率
    config2.sample_rate = 44100;
    EXPECT_NE(config1, config2);
    EXPECT_FALSE(config1 == config2);
    
    // 重置并测试不同声道数
    config2 = config1;
    config2.channels = 1;
    EXPECT_NE(config1, config2);
    
    // 重置并测试不同格式
    config2 = config1;
    config2.format = AudioFormat::INT16;
    EXPECT_NE(config1, config2);
    
    // 重置并测试不同帧数
    config2 = config1;
    config2.frames_per_buffer = 1024;
    EXPECT_NE(config1, config2);
}

int main(int argc, char** argv) {
    ::testing::InitGoogleTest(&argc, argv);
    return RUN_ALL_TESTS();
}