// SPDX-License-Identifier: LGPL-3.0-only
// SPDX-FileCopyrightText: Copyright (C) 2026 Catcrafts®

// Three configurations:
//   Crafter.Debug.Core  what the app and the client share (values, codecs)
//   crafter.debug-cli   the client, crafter-debug
//   Crafter.Debug       what an app links (returned), depending on both
// The client is one of the library's dependencies only so that a consumer's
// debug build compiles it in the same pass as the app; an executable adds no
// link flags to what depends on it. Consumers load this file through
// Debug::Use (tooling/), which also writes their launcher.
import std;
import Crafter.Build;
namespace fs = std::filesystem;
using namespace Crafter;

namespace {
    // The configurations this file makes besides the one it returns, at
    // stable addresses for the pointers in `dependencies`. One set per load,
    // not statics: a static would keep the first load's args for every load.
    std::deque<Configuration> owned;

    // This file's directory. A configuration a project file makes for itself
    // keeps the path it is given, and "./" would later resolve against the
    // consumer's directory instead of this one.
    fs::path Root() {
        return fs::path(std::source_location::current().file_name()).parent_path();
    }

    // Tests of the core, linked against it alone.
    constexpr std::array<std::string_view, 4> coreTests = {
        "ShouldRoundTripJson",
        "ShouldRoundTripAggregates",
        "ShouldReportDecodeErrorsWithPaths",
        "ShouldDescribeDefaultsAndRequired",
    };

    // Tests of the app library.
    constexpr std::array<std::string_view, 4> libraryTests = {
        "ShouldInvokeCommands",
        "ShouldResolveWatchPaths",
        "ShouldRecordTimeline",
        "ShouldEvaluateConditions",
    };
}

extern "C" Configuration CrafterBuildProject(std::span<const std::string_view> args) {
    Configuration cfg;
    cfg.path = "./";
    cfg.name = "Crafter.Debug";
    cfg.outputName = "Crafter.Debug";
    cfg.type = ConfigurationType::LibraryStatic;
    ApplyStandardArgs(cfg, args);

    Configuration& core = owned.emplace_back();
    core.path = Root();
    core.name = "Crafter.Debug.Core";
    core.outputName = "Crafter.Debug.Core";
    core.type = ConfigurationType::LibraryStatic;
    ApplyStandardArgs(core, args);
    {
        std::array<fs::path, 5> interfaces = {
            "interfaces/Crafter.Debug.Core-Value",
            "interfaces/Crafter.Debug.Core-Reflect",
            "interfaces/Crafter.Debug.Core-Codec",
            "interfaces/Crafter.Debug.Core-Result",
            "interfaces/Crafter.Debug.Core",
        };
        std::array<fs::path, 2> implementations = {
            "implementations/Crafter.Debug.Core-Value",
            "implementations/Crafter.Debug.Core-Codec",
        };
        core.GetInterfacesAndImplementations(interfaces, implementations);
    }

    // The client, built for the library's target. Not through
    // ApplyStandardArgs: a consumer's --lib would make it a library.
    Configuration& client = owned.emplace_back();
    client.path = Root();
    client.name = "crafter.debug-cli";
    client.outputName = "crafter-debug";
    client.type = ConfigurationType::Executable;
    client.target = cfg.target;
    client.march = cfg.march;
    client.mtune = cfg.mtune;
    client.sysroot = cfg.sysroot;
    client.debug = cfg.debug;
    client.dependencies = { &core };
    {
        std::array<fs::path, 0> interfaces = {};
        std::array<fs::path, 1> implementations = { "implementations/main" };
        client.GetInterfacesAndImplementations(interfaces, implementations);
    }

    cfg.dependencies = { &core, &client };
    {
        std::array<fs::path, 4> interfaces = {
            "interfaces/Crafter.Debug-Registry",
            "interfaces/Crafter.Debug-Timeline",
            "interfaces/Crafter.Debug-Condition",
            "interfaces/Crafter.Debug",
        };
        std::array<fs::path, 3> implementations = {
            "implementations/Crafter.Debug-Registry",
            "implementations/Crafter.Debug-Timeline",
            "implementations/Crafter.Debug-Condition",
        };
        cfg.GetInterfacesAndImplementations(interfaces, implementations);
    }

    // Tests only when this is the project being built: a consumer's load of
    // this file has no use for them.
    if (IsTopLevelProject()) {
        for (const std::string_view test : coreTests) cfg.AddTest(test).Dependencies({ &core });
        for (const std::string_view test : libraryTests) cfg.AddTest(test).Dependencies({ &cfg });
    }
    return cfg;
}