#include <catch2/catch_test_macros.hpp>

import cargoxx.resolver;
import cargoxx.util;
import std;

using cargoxx::resolver::parse_vcpkg_usage;
using cargoxx::util::ErrorCode;

TEST_CASE("parse_vcpkg_usage extracts find_package and a target",
          "[resolver][vcpkg]") {
    constexpr std::string_view text = R"(fmt provides CMake targets:

    find_package(fmt CONFIG REQUIRED)
    target_link_libraries(main PRIVATE fmt::fmt)
)";
    auto r = parse_vcpkg_usage(text);
    REQUIRE(r.has_value());
    REQUIRE(r->find_package == "fmt CONFIG REQUIRED");
    REQUIRE(r->targets == std::vector<std::string>{"fmt::fmt"});
}

TEST_CASE("parse_vcpkg_usage adds REQUIRED when missing", "[resolver][vcpkg]") {
    constexpr std::string_view text = R"(
    find_package(spdlog CONFIG)
    target_link_libraries(main PRIVATE spdlog::spdlog)
)";
    auto r = parse_vcpkg_usage(text);
    REQUIRE(r.has_value());
    REQUIRE(r->find_package == "spdlog CONFIG REQUIRED");
}

TEST_CASE("parse_vcpkg_usage dedupes targets", "[resolver][vcpkg]") {
    constexpr std::string_view text = R"(
    find_package(boost CONFIG REQUIRED)
    target_link_libraries(main PRIVATE Boost::filesystem Boost::system Boost::filesystem)
)";
    auto r = parse_vcpkg_usage(text);
    REQUIRE(r.has_value());
    REQUIRE(r->targets == std::vector<std::string>{"Boost::filesystem", "Boost::system"});
}

TEST_CASE("parse_vcpkg_usage skips generator-expression and bare-name tokens",
          "[resolver][vcpkg]") {
    constexpr std::string_view text = R"(
    find_package(qt6 CONFIG REQUIRED)
    target_link_libraries(main PRIVATE Qt6::Core $<TARGET_NAME:Qt6::Gui> mylib)
)";
    auto r = parse_vcpkg_usage(text);
    REQUIRE(r.has_value());
    // mylib lacks "::", $<...> contains '$' — both excluded.
    REQUIRE(r->targets == std::vector<std::string>{"Qt6::Core"});
}

TEST_CASE("parse_vcpkg_usage errors when no find_package directive present",
          "[resolver][vcpkg]") {
    auto r = parse_vcpkg_usage("nothing useful here");
    REQUIRE_FALSE(r.has_value());
    REQUIRE(r.error().code == ErrorCode::ResolutionUnknownPackage);
}

TEST_CASE("parse_vcpkg_usage handles target_link_libraries with PUBLIC visibility",
          "[resolver][vcpkg]") {
    constexpr std::string_view text = R"(
    find_package(eigen3 CONFIG REQUIRED)
    target_link_libraries(main PUBLIC Eigen3::Eigen)
)";
    auto r = parse_vcpkg_usage(text);
    REQUIRE(r.has_value());
    REQUIRE(r->targets == std::vector<std::string>{"Eigen3::Eigen"});
}