#include <catch2/catch_test_macros.hpp>

import cargoxx.cli;
import cargoxx.util;
import std;

using cargoxx::cli::cmd_new;
using cargoxx::cli::cmd_run;
using cargoxx::util::ErrorCode;

namespace {

auto fresh_dir() -> std::filesystem::path {
    auto d = std::filesystem::temp_directory_path() /
             std::format("cargoxx-run-test-{}", std::random_device{}());
    std::filesystem::create_directories(d);
    return d;
}

auto overlay_path(const std::filesystem::path& dir) -> std::filesystem::path {
    return dir / "overlay.sqlite";
}

auto add_extra_bin(const std::filesystem::path& root, std::string_view name) {
    auto p = root / "src" / "bin" / std::format("{}.cpp", name);
    std::filesystem::create_directories(p.parent_path());
    std::ofstream{p} << "int main() { return 0; }\n";
}

} // namespace

TEST_CASE("cmd_run errors when no binary is present", "[cli][run]") {
    // A library-only project has no binary to run.
    auto parent = fresh_dir();
    REQUIRE(cmd_new("widget", true, parent).has_value());
    auto root = parent / "widget";

    auto r = cmd_run(root, false, std::nullopt, {}, overlay_path(parent));
    REQUIRE_FALSE(r.has_value());
    REQUIRE(r.error().code == ErrorCode::LayoutNoTarget);
}

TEST_CASE("cmd_run errors when --bin doesn't match any target", "[cli][run]") {
    auto parent = fresh_dir();
    REQUIRE(cmd_new("app", false, parent).has_value());
    auto root = parent / "app";

    auto r = cmd_run(root, false, std::string{"missing"}, {}, overlay_path(parent));
    REQUIRE_FALSE(r.has_value());
    REQUIRE(r.error().code == ErrorCode::LayoutNoTarget);
}

TEST_CASE("cmd_run requires --bin when multiple binaries exist", "[cli][run]") {
    auto parent = fresh_dir();
    REQUIRE(cmd_new("app", false, parent).has_value());
    auto root = parent / "app";
    add_extra_bin(root, "tool");

    auto r = cmd_run(root, false, std::nullopt, {}, overlay_path(parent));
    REQUIRE_FALSE(r.has_value());
    REQUIRE(r.error().code == ErrorCode::LayoutNoTarget);
    // Hint should list both target names.
    REQUIRE(r.error().hint.find("app") != std::string::npos);
    REQUIRE(r.error().hint.find("tool") != std::string::npos);
}