const std = @import("std");

// Although this function looks imperative, note that its job is to
// declaratively construct a build graph that will be executed by an external
// runner.
pub fn build(b: *std.Build) void {
    // Standard target options allows the person running `zig build` to choose
    // what target to build for. Here we do not override the defaults, which
    // means any target is allowed, and the default is native. Other options
    // for restricting supported target set are available.
    const target = b.standardTargetOptions(.{});

    // Standard optimization options allow the person running `zig build` to select
    // between Debug, ReleaseSafe, ReleaseFast, and ReleaseSmall. Here we do not
    // set a preferred release mode, allowing the user to decide how to optimize.
    const optimize = b.standardOptimizeOption(.{});

    // We will also create a module for our other entry point, 'main.zig'.
    const exe_mod = b.createModule(.{
        // `root_source_file` is the Zig "entry point" of the module. If a module
        // only contains e.g. external object files, you can make this `null`.
        // In this case the main source file is merely a path, however, in more
        // complicated build scripts, this could be a generated file.
        .root_source_file = b.path("src/main.zig"),
        .target = target,
        .optimize = optimize,
    });

    const security_mod = b.createModule(.{ .root_source_file = b.path("src/security/main.zig"), .target = target, .optimize = optimize });
    const context_mod = b.createModule(.{ .root_source_file = b.path("src/context/main.zig"), .target = target, .optimize = optimize });
    const data_mod = b.createModule(.{ .root_source_file = b.path("src/data/main.zig"), .target = target, .optimize = optimize });
    const endpoints_mod = b.createModule(.{ .root_source_file = b.path("src/endpoints/main.zig"), .target = target, .optimize = optimize });
    const parses_mod = b.createModule(.{ .root_source_file = b.path("src/parses/main.zig"), .target = target, .optimize = optimize });
    const things_mod = b.createModule(.{ .root_source_file = b.path("src/things/main.zig"), .target = target, .optimize = optimize });
    const services_mod = b.createModule(.{ .root_source_file = b.path("src/services/main.zig"), .target = target, .optimize = optimize });
    const exchange_mod = b.createModule(.{ .root_source_file = b.path("src/exchange/main.zig"), .target = target, .optimize = optimize });
    const helpers_mod = b.createModule(.{ .root_source_file = b.path("src/helpers/main.zig"), .target = target, .optimize = optimize });

    parses_mod.addImport("things", things_mod);

    data_mod.addImport("things", things_mod);

    context_mod.addImport("data", data_mod);
    context_mod.addImport("exchange", exchange_mod);

    endpoints_mod.addImport("things", things_mod);
    endpoints_mod.addImport("parses", parses_mod);
    endpoints_mod.addImport("context", context_mod);
    endpoints_mod.addImport("data", data_mod);
    endpoints_mod.addImport("security", security_mod);

    services_mod.addImport("helpers", helpers_mod);

    exchange_mod.addImport("things", things_mod);
    exchange_mod.addImport("data", data_mod);
    exchange_mod.addImport("helpers", helpers_mod);

    exe_mod.addImport("things", things_mod);
    exe_mod.addImport("context", context_mod);
    exe_mod.addImport("security", security_mod);
    exe_mod.addImport("endpoints", endpoints_mod);
    exe_mod.addImport("parses", parses_mod);
    exe_mod.addImport("data", data_mod);
    exe_mod.addImport("services", services_mod);
    exe_mod.addImport("exchange", exchange_mod);

    // This creates another `std.Build.Step.Compile`, but this one builds an executable
    // rather than a static library.
    const exe = b.addExecutable(.{
        .name = "zigpay",
        .root_module = exe_mod,
    });

    // This declares intent for the executable to be installed into the
    // standard location when the user invokes the "install" step (the default
    // step when running `zig build`).
    b.installArtifact(exe);

    // This *creates* a Run step in the build graph, to be executed when another
    // step is evaluated that depends on it. The next line below will establish
    // such a dependency.
    const run_cmd = b.addRunArtifact(exe);

    // By making the run step depend on the install step, it will be run from the
    // installation directory rather than directly from within the cache directory.
    // This is not necessary, however, if the application depends on other installed
    // files, this ensures they will be present and in the expected location.
    run_cmd.step.dependOn(b.getInstallStep());

    // This allows the user to pass arguments to the application in the build
    // command itself, like this: `zig build run -- arg1 arg2 etc`
    if (b.args) |args| {
        run_cmd.addArgs(args);
    }

    // This creates a build step. It will be visible in the `zig build --help` menu,
    // and can be selected like this: `zig build run`
    // This will evaluate the `run` step rather than the default, which is "install".
    const run_step = b.step("run", "Run the app");
    run_step.dependOn(&run_cmd.step);

    // TESTS
    const security_unit_tests = b.addTest(.{ .root_module = security_mod, .name = "security" });
    const run_security_unit_tests = b.addRunArtifact(security_unit_tests);

    const data_unit_tests = b.addTest(.{ .root_module = data_mod, .name = "data" });
    const run_data_unit_tests = b.addRunArtifact(data_unit_tests);

    const things_unit_tests = b.addTest(.{ .root_module = things_mod, .name = "things" });
    const run_things_unit_tests = b.addRunArtifact(things_unit_tests);

    const endpoints_unit_tests = b.addTest(.{ .root_module = endpoints_mod, .name = "endpoints" });
    const run_endpoints_unit_tests = b.addRunArtifact(endpoints_unit_tests);

    const services_unit_tests = b.addTest(.{ .root_module = services_mod, .name = "services" });
    const run_services_unit_tests = b.addRunArtifact(services_unit_tests);

    const exchange_unit_tests = b.addTest(.{ .root_module = exchange_mod, .name = "exchange" });
    const run_exchange_unit_tests = b.addRunArtifact(exchange_unit_tests);

    const parses_unit_tests = b.addTest(.{ .root_module = parses_mod, .name = "parses" });
    const run_parses_unit_tests = b.addRunArtifact(parses_unit_tests);

    const exe_unit_tests = b.addTest(.{ .root_module = exe_mod, .name = "root" });
    const run_exe_unit_tests = b.addRunArtifact(exe_unit_tests);

    // Similar to creating the run step earlier, this exposes a `test` step to
    // the `zig build --help` menu, providing a way for the user to request
    // running the unit tests.
    const test_step = b.step("test", "Run unit tests");
    test_step.dependOn(&run_security_unit_tests.step);
    test_step.dependOn(&run_things_unit_tests.step);
    test_step.dependOn(&run_data_unit_tests.step);
    test_step.dependOn(&run_parses_unit_tests.step);
    test_step.dependOn(&run_services_unit_tests.step);
    test_step.dependOn(&run_exchange_unit_tests.step);
    test_step.dependOn(&run_endpoints_unit_tests.step);
    test_step.dependOn(&run_exe_unit_tests.step);
}