const std = @import("std");

pub fn build(b: *std.Build) void {
    const target = b.standardTargetOptions(.{});
    const optimize = b.standardOptimizeOption(.{});

    // NOTE: src/version.txt is embedded at compile time via @embedFile("version.txt")
    // in updater.zig. Locally it contains "v0.0.0-dev". GitHub Actions overwrites this
    // file with the real semver tag (e.g. "v0.2.3") BEFORE invoking `zig build`, so the
    // released binary always contains the correct version. build.zig does NOT write this
    // file — doing so with a sh/git command is cross-platform broken and unnecessary.

    // --- SDL3 dependency ---
    const sdl3_dep = b.dependency("SDL", .{
        .target = target,
        .optimize = optimize,
    });

    // --- SDL3_ttf dependency ---
    const sdl3_ttf_dep = b.dependency("SDL_ttf", .{
        .target = target,
        .optimize = optimize,
    });

    // --- Main executable ---
    const mod = b.createModule(.{
        .root_source_file = b.path("src/main.zig"),
        .target = target,
        .optimize = optimize,
        .link_libc = true,
    });

    // Add C include paths to the module
    mod.addIncludePath(b.path("vendor/clay"));
    mod.addIncludePath(b.path("vendor/stb"));

    // Clay: compile as C source
    mod.addCSourceFile(.{
        .file = b.path("vendor/clay/clay_impl.c"),
        .flags = &.{"-std=c99"},
    });

    // stb_image: compile as C source
    mod.addCSourceFile(.{
        .file = b.path("vendor/stb/stb_image_impl.c"),
        .flags = &.{"-std=c99"},
    });

    // Link SDL3 and SDL3_ttf
    mod.linkLibrary(sdl3_dep.artifact("SDL3"));
    mod.linkLibrary(sdl3_ttf_dep.artifact("SDL3_ttf"));

    const exe = b.addExecutable(.{
        .name = "flint",
        .root_module = mod,
    });
    if (target.result.os.tag == .windows) {
        exe.subsystem = .Windows;
    }

    b.installArtifact(exe);

    // --- Run step ---
    const run_cmd = b.addRunArtifact(exe);
    run_cmd.step.dependOn(b.getInstallStep());
    if (b.args) |args| {
        run_cmd.addArgs(args);
    }

    const run_step = b.step("run", "Run the launcher");
    run_step.dependOn(&run_cmd.step);
}