const std = @import("std");
const sokol = @import("sokol");

const title = "sok";

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

    const dep_sokol = b.dependency("sokol", .{ .target = target, .optimize = optimize });

    if (!target.result.isWasm()) {
        // Native exe

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

        exe.root_module.addImport("sokol", dep_sokol.module("sokol"));

        // Set this to hide console on windows
        //exe.subsystem = .Windows;

        b.installArtifact(exe);

        // Check step (for ZLS)

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

        exe_check.root_module.addImport("sokol", dep_sokol.module("sokol"));

        const check = b.step("check", "Check if project compiles");
        check.dependOn(&exe_check.step);

        // Run

        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" ++ title ++ " as native app");
        run_step.dependOn(&run_cmd.step);
    } else {
        // Web

        const wasmLib = b.addStaticLibrary(.{
            .name = title,
            .target = target,
            .optimize = optimize,
            .root_source_file = b.path("src/pacman.zig"),
        });
        wasmLib.root_module.addImport("sokol", dep_sokol.module("sokol"));

        // create a build step which invokes the Emscripten linker
        const emsdk = dep_sokol.builder.dependency("emsdk", .{});
        const link_step = try sokol.emLinkStep(b, .{
            .lib_main = wasmLib,
            .target = target,
            .optimize = optimize,
            .emsdk = emsdk,
            .use_webgl2 = true,
            .use_emmalloc = true,
            .use_filesystem = false,
            .shell_file_path = dep_sokol.path("src/sokol/web/shell.html").getPath(b),
        });
        // ...and a special run step to start the web build output via 'emrun'
        const run = sokol.emRunStep(b, .{ .name = "sok", .emsdk = emsdk });
        run.step.dependOn(&link_step.step);
        b.step("run", "Run " ++ title ++ " as wasm").dependOn(&run.step);
    }

    // Tests

    const exe_unit_tests = b.addTest(.{
        .root_source_file = b.path("src/main.zig"),
        .target = target,
        .optimize = optimize,
    });

    const run_exe_unit_tests = b.addRunArtifact(exe_unit_tests);

    const test_step = b.step("test", "Run unit tests");
    test_step.dependOn(&run_exe_unit_tests.step);
}