#include <catch2/catch_test_macros.hpp>

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

using cargoxx::resolver::parse_nix_eval_json;
using cargoxx::util::ErrorCode;

TEST_CASE("parse_nix_eval_json extracts version and outPath", "[resolver][nixpkgs]") {
    constexpr std::string_view input = R"({
        "version": "3.7.0",
        "path": "/nix/store/abc-simdjson-3.7.0"
    })";

    auto r = parse_nix_eval_json("simdjson", input);
    REQUIRE(r.has_value());
    REQUIRE(r->attr == "simdjson");
    REQUIRE(r->version == "3.7.0");
    REQUIRE(r->out_path == "/nix/store/abc-simdjson-3.7.0");
}

TEST_CASE("parse_nix_eval_json accepts an empty version field",
          "[resolver][nixpkgs]") {
    constexpr std::string_view input = R"({
        "version": "",
        "path": "/nix/store/xyz-foo"
    })";

    auto r = parse_nix_eval_json("foo", input);
    REQUIRE(r.has_value());
    REQUIRE(r->version.empty());
    REQUIRE(r->out_path == "/nix/store/xyz-foo");
}

TEST_CASE("parse_nix_eval_json fails when outPath is missing",
          "[resolver][nixpkgs]") {
    constexpr std::string_view input = R"({"version": "1.0"})";
    auto r = parse_nix_eval_json("foo", input);
    REQUIRE_FALSE(r.has_value());
    REQUIRE(r.error().code == ErrorCode::ResolutionNetworkError);
}

TEST_CASE("parse_nix_eval_json fails on garbage input", "[resolver][nixpkgs]") {
    auto r = parse_nix_eval_json("foo", "not-json-at-all");
    REQUIRE_FALSE(r.has_value());
    REQUIRE(r.error().code == ErrorCode::ResolutionNetworkError);
}

TEST_CASE("parse_nix_eval_json fails on a non-object root",
          "[resolver][nixpkgs]") {
    auto r = parse_nix_eval_json("foo", "[]");
    REQUIRE_FALSE(r.has_value());
    REQUIRE(r.error().code == ErrorCode::ResolutionNetworkError);
}