const std = @import("std");

// fn thisDir() []const u8 {
//     return std.fs.path.dirname(@src().file) orelse ".";
// }

pub fn build(b: *std.build.Builder) void {
    // TODO Use mode to set debug flags in MiniFB
    const mode = b.standardReleaseOptions();
    const target = b.standardTargetOptions(.{});

    var main_tests = b.addTest("src/minifb.zig");
    main_tests.setBuildMode(mode);
    main_tests.setTarget(target);
    link(b, main_tests);

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

pub fn link(b: *std.build.Builder, step: *std.build.LibExeObjStep) void {
    const lib = buildLibrary(b, step);
    step.linkLibrary(lib);
}

fn fromHere(allocator: std.mem.Allocator, path: []const u8) []const u8 {
    const here = std.fs.path.dirname(@src().file) orelse ".";
    return std.fs.path.join(allocator, &.{here, path}) catch unreachable;
}

fn buildLibrary(b: *std.build.Builder, step: *std.build.LibExeObjStep) *std.build.LibExeObjStep {
    // var main_abs = std.fs.path.join(b.allocator, &.{thisDir(), "src/minifb.zig"}) catch unreachable;
    const lib = b.addStaticLibrary("minifb", fromHere(b.allocator, "src/minifb.zig"));
    lib.setBuildMode(step.build_mode);

    var sources = std.ArrayList([]const u8) .init(b.allocator);
    for ([_][]const u8{
        "upstream/src/MiniFB_common.c",
        "upstream/src/MiniFB_internal.c",
        //"upstream/src/MiniFB_internal.h",
        "upstream/src/MiniFB_timer.c",
        //"upstream/src/WindowData.h",
        //"upstream/src/windows/WindowData_Win.h",
        "upstream/src/windows/WinMiniFB.c",
    }) |path| {
        // const abs_path = std.fs.path.join(b.allocator, &.{ thisDir(), path}) catch unreachable;
        sources.append(fromHere(b.allocator, path)) catch unreachable;
    }

    // TODO More than Windows
    lib.addCSourceFiles(sources.items, &[_][]const u8{
        "-Wall",
        "-Wextra",
        "-pedantic",
        "-Wno-switch",
        "-Wno-unused-function",
        "-Wno-implicit-fallthrough",
        "-std=c11",
    });
    
    const include_abs = fromHere(b.allocator, "upstream/include");
    const src_abs = fromHere(b.allocator, "upstream/src");
    lib.addIncludeDir(include_abs);
    lib.addIncludeDir(src_abs);
    step.addIncludeDir(include_abs);
    step.addIncludeDir(src_abs);
    
    lib.linkSystemLibraryName("gdi32");
    lib.linkLibC();
    lib.install();
    return lib;
}