const std = @import("std");
// const rl = @import("libs/raylib-zig/build.zig");
const raylib = @import("libs/raylib/build.zig");

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

    // TODO: Figure out how to build project for WASM. Tried to do it but standard memory allocators
    // didn't work.

    //web exports are completely separate
    // if (target.getOsTag() == .emscripten) {
    //     const exe_lib = rl.compileForEmscripten(b, "chip8-zig", "src/main.zig", target, optimize);
    //     exe_lib.addModule("raylib", raylib);
    //     exe_lib.addModule("raylib-math", raylib_math);
    //
    //     const raylib_artifact = rl.getArtifact(b, target, optimize);
    //     // Note that raylib itself is not actually added to the exe_lib output file, so it also needs to be linked with emscripten.
    //     exe_lib.linkLibrary(raylib_artifact);
    //
    //     const link_step = try rl.linkWithEmscripten(b, &[_]*std.Build.Step.Compile{ exe_lib, raylib_artifact });
    //     b.getInstallStep().dependOn(&link_step.step);
    //
    //     const run_step = try rl.emscriptenRunStep(b);
    //     run_step.step.dependOn(&link_step.step);
    //
    //     const run_option = b.step("run", "Run chip8-zig");
    //     run_option.dependOn(&run_step.step);
    //     return;
    // }

    const exe = b.addExecutable(.{ .name = "chip8-zig", .root_source_file = .{ .path = "src/main.zig" }, .optimize = optimize, .target = target });

    // Provide filenames of all files in 'src/ROMs' to program as options
    {
        var files = std.ArrayList([]const u8).init(b.allocator);
        defer files.deinit();
        var options = b.addOptions();
        var dir = try std.fs.cwd().openIterableDir("src/ROMs", .{ });
        var it = dir.iterate();
        while (try it.next()) |file| {
            if (file.kind != .file) {
                continue;
            }
            try files.append(b.pathJoin(&.{"ROMs", file.name}));
        }

        options.addOption([]const []const u8, "roms", files.items);
        exe.addOptions("options", options);
    }

    raylib.addTo(b, exe, target, optimize);

    // rl.link(b, exe, target, optimize);
    // exe.addModule("raylib", rl.getModule(b, "libs/raylib-zig"));
    // exe.addModule("raylib-math", rl.math.getModule(b, "libs/raylib-zig"));

    {
        var build_models_step = b.step("models", "Export .blend files");
        var build_models = b.addSystemCommand(&[_][]const u8{ "blender" });
        build_models.addFileArg(.{ .path = "src/assets/models/emulator.blend" });
        build_models.addArg("--background");
        build_models.addArg("--python");
        build_models.addFileArg(.{ .path = "src/assets/models/export_obj.py" });
        build_models.addArg("--");
        build_models.addArg("src/assets/models/emulator");

        build_models_step.dependOn(&build_models.step);
        exe.step.dependOn(build_models_step);
    }

    const run_cmd = b.addRunArtifact(exe);

    const run_step = b.step("run", "Run chip8-zig");
    run_step.dependOn(&run_cmd.step);

    b.installArtifact(exe);
}