/*
Crafter® Build
Copyright (C) 2026 Catcrafts®
Catcrafts.net

This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License version 3.0 as published by the Free Software Foundation;

This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301 USA
*/

module;
#include "Crafter.Build-Api.h"
export module Crafter.Build:Test;
import std;
import :Clang;

export namespace Crafter {
    // One row in a SIMD-march fan-out: a single Test variant compiles the
    // shared source with `-march=<march> -mtune=<mtune>`. Passed by span to
    // Configuration::AddMarchVariants — see Crafter.Math/project.cpp.
    struct MarchTier {
        std::string march;
        std::string mtune;
    };

    // Fluent helper returned by Configuration::AddTest. Holds a back-pointer
    // to the parent Configuration and the index of the just-pushed Test, so
    // mutations survive any vector reallocation that subsequent AddTest
    // calls might trigger. Each setter returns `*this` to support chaining.
    //
    // Note: source files (interfaces + implementations) are fixed at
    // AddTest-time — pass them via the AddTest overload that takes
    // interfaces. The builder only mutates compile state, deps, runtime
    // args, and requires; it deliberately does NOT expose Sources() to
    // avoid the double-`GetInterfacesAndImplementations` footgun (calling
    // it twice would re-parse the same .cppm files into duplicate Module
    // entries).
    struct CRAFTER_API TestBuilder {
        Configuration* parent;
        std::size_t index;

        Test& test() const { return parent->tests[index]; }

        // Override the path the test's sources resolve against. Defaults to
        // "./" (project root, where tests/<name>/main.cpp lives). Override
        // only when the test source layout sits under a subdir.
        TestBuilder& Path(std::filesystem::path p);
        TestBuilder& Target(std::string t);
        TestBuilder& March(std::string m);
        TestBuilder& Mtune(std::string m);
        TestBuilder& Sysroot(std::filesystem::path s);
        TestBuilder& Debug(bool d = true);
        TestBuilder& Define(std::string name, std::string value = "");
        TestBuilder& Timeout(std::chrono::seconds s);
        // Replaces any previously-set args.
        TestBuilder& Args(std::vector<std::string> a);
        // Appends one require entry ("tool:foo" / "file:..." / "env:VAR").
        TestBuilder& Requires(std::string r);
        // Replaces the dependency list. Pointers must outlive the build.
        TestBuilder& Dependencies(std::vector<Configuration*> deps);
        // Append a single linker flag (-l..., -L..., etc.).
        TestBuilder& LinkFlag(std::string f);
        // Append a single compile flag.
        TestBuilder& CompileFlag(std::string f);
    };

    struct RunTestsOptions {
        std::vector<std::string> globs;
        int jobs = 0;
        std::optional<std::chrono::seconds> timeoutOverride;
        bool listOnly = false;
        // Single-target run: only tests whose Configuration::target matches
        // are included. Empty (default) = run every distinct target declared
        // across discovered tests, plus the host target. Set from --target=...
        // (when omitted, the harness sweeps all declared targets so cross-arch
        // tests run by default without the user having to know which targets
        // exist).
        std::string targetFilter;
        // CLI override for --runner=<spec>: applies to every test in the run.
        // Target scoping is unnecessary because targetFilter ensures the run
        // contains only one target's tests.
        std::optional<std::string> runnerOverride;
    };

    struct TestSummary {
        int passed = 0;
        int failed = 0;
        int crashed = 0;
        int timedOut = 0;
        int skipped = 0;
        std::vector<TestResult> results;
        bool AllPassed() const { return failed == 0 && crashed == 0 && timedOut == 0; }
    };

    CRAFTER_API TestSummary RunTests(Configuration& projectCfg, const RunTestsOptions& opts, std::span<const std::string_view> projectArgs = {});
    CRAFTER_API TestResult RunSingleTest(const Test& test, const std::filesystem::path& binary, std::chrono::seconds timeout);

    // Parent-project access for test fixtures. Run() sets the pointer to the
    // root project's Configuration before discovery; fixtures call ParentLib()
    // to obtain a Configuration* for one of the parent's libraries (or the
    // parent itself) so they can declare it as a dependency without rebuilding
    // the lib config from scratch. Lookup is by Configuration::name and
    // recurses through the parent's dependency graph.
    CRAFTER_API void SetParentProject(Configuration* parent);
    CRAFTER_API Configuration* ParentLib(std::string_view name);
}