#include <gtest/gtest.h>
#include "aise/codegen.hpp"
#include <string>
#include <vector>

namespace aise {

class CodegenModuleTest : public ::testing::Test {
protected:
    CodegenModule module_;
};

TEST_F(CodegenModuleTest, testGenerateNormalInputCpp) {
    auto result = module_.generate("SRS-001", "C++", "");
    EXPECT_TRUE(result.success);
    EXPECT_EQ(result.generated_files.size(), 1);
    EXPECT_EQ(result.generated_files[0], "SRS-001_impl.cpp");
    EXPECT_EQ(result.trace_links.size(), 1);
    EXPECT_EQ(result.trace_links[0].req_id, "SRS-001");
    EXPECT_EQ(result.output_dir, "./generated/SRS-001");
}

TEST_F(CodegenModuleTest, testGenerateNormalInputJava) {
    auto result = module_.generate("REQ-002", "Java", "");
    EXPECT_TRUE(result.success);
    EXPECT_EQ(result.generated_files[0], "REQ-002_impl.java");
    EXPECT_EQ(result.trace_links[0].req_id, "REQ-002");
}

TEST_F(CodegenModuleTest, testGenerateUnsupportedLanguage) {
    auto result = module_.generate("SRS-003", "Python", "");
    EXPECT_FALSE(result.success);
    EXPECT_EQ(result.error_msg, "Unsupported language: Python");
    EXPECT_TRUE(result.generated_files.empty());
}

TEST_F(CodegenModuleTest, testGenerateEmptyReqId) {
    auto result = module_.generate("", "C++", "");
    EXPECT_TRUE(result.success);
    EXPECT_EQ(result.generated_files[0], "_impl.cpp");
}

TEST_F(CodegenModuleTest, testGetTraceLinksExisting) {
    module_.generate("SRS-001", "C++", "");
    auto links = module_.getTraceLinks("SRS-001");
    ASSERT_EQ(links.size(), 1);
    EXPECT_EQ(links[0].req_id, "SRS-001");
    EXPECT_EQ(links[0].file_path, "SRS-001_impl.cpp");
}

TEST_F(CodegenModuleTest, testGetTraceLinksNonExisting) {
    auto links = module_.getTraceLinks("NONEXISTENT");
    EXPECT_TRUE(links.empty());
}

TEST_F(CodegenModuleTest, testGenerateCppSkeletonNormal) {
    RequirementItem req;
    req.id = "SRS-001";
    req.title = "Test Requirement";
    req.description = "Test Description";
    std::string code = module_.generateCppSkeleton(req);
    EXPECT_NE(code.find("class SRSModule"), std::string::npos);
    EXPECT_NE(code.find("// Requirement: SRS-001 - Test Requirement"), std::string::npos);
    EXPECT_NE(code.find("void execute()"), std::string::npos);
}

TEST_F(CodegenModuleTest, testGenerateJavaSkeletonNormal) {
    RequirementItem req;
    req.id = "REQ-002";
    req.title = "Java Requirement";
    req.description = "Java Description";
    std::string code = module_.generateJavaSkeleton(req);
    EXPECT_NE(code.find("public class REQModule"), std::string::npos);
    EXPECT_NE(code.find("public void execute()"), std::string::npos);
    EXPECT_NE(code.find("System.out.println"), std::string::npos);
}

} // namespace aise