const std = @import("std");

const base_cflags: []const []const u8 = &.{
    "-Wall",
    "-Wextra",
    "-pedantic",
    "-Wno-switch",
    "-Wno-unused-function",
    "-Wno-implicit-fallthrough",
};

pub fn build(b: *std.build.Builder) !void {
    const mode = b.standardReleaseOptions();
    const target = b.standardTargetOptions(.{});

    var c_flags = try std.ArrayList([]const u8).initCapacity(b.allocator, base_cflags.len);
    defer c_flags.deinit();
    try c_flags.appendSlice(base_cflags);

    var c_sources = std.ArrayList([]const u8).init(b.allocator);
    defer c_sources.deinit();
    try c_sources.appendSlice(&.{
        "src/MiniFB_common.c",
        "src/MiniFB_internal.c",
        "src/MiniFB_timer.c",
    });

    const use_opengl = b.option(bool, "opengl", "Use OpenGL") orelse false;

    const lib = b.addStaticLibrary("minifb-zig-port", null);
    lib.addIncludeDir("src");
    lib.addIncludeDir("include");
    lib.linkLibC();
    lib.setBuildMode(mode);
    lib.install();

    switch (target.getOsTag()) {
        std.Target.Os.Tag.windows => {
            try c_sources.append("src/windows/WinMiniFB.c");
            lib.linkSystemLibraryName("gdi32");
            if (use_opengl) {
                try c_flags.append("-DUSE_OPENGL_API");
                try c_sources.append("src/gl/MiniFB_GL.c");
                lib.linkSystemLibraryName("opengl32");
            }
        },
        std.Target.Os.Tag.linux => {
            try c_sources.append("src/MiniFB_linux.c");
            try c_sources.append("src/x11/X11MiniFB.c");
            lib.linkSystemLibrary("rt");
            lib.linkSystemLibrary("X11");

            if (use_opengl) {
                try c_flags.append("-DUSE_OPENGL_API");
                try c_sources.append("src/gl/MiniFB_GL.c");
                lib.linkSystemLibrary("GL");
            }
            
            // TODO wayland
        },
        else => {
            return error.PlatformNotSupported;
        },
    }

    lib.addCSourceFiles(c_sources.items, c_flags.items);

    addExample(b, "noise", "tests/noise.c", lib, target, mode);
    addExample(b, "multiple-windows", "tests/multiple_windows.c", lib, target, mode);
    addExample(b, "input-events", "tests/input_events.c", lib, target, mode);
    addExample(b, "hidpi", "tests/hidpi.c", lib, target, mode);
}

fn addExample(b: *std.build.Builder, comptime name: []const u8, file: []const u8, lib: *std.build.LibExeObjStep, target: std.zig.CrossTarget, mode: std.builtin.Mode) void {
    const exe = b.addExecutable(name, null);
    exe.setBuildMode(mode);
    exe.setTarget(target);
    exe.linkLibrary(lib);
    exe.addIncludeDir("include");
    exe.addCSourceFile(file, base_cflags);
    exe.install();

    const step_name = "run-" ++ name;
    b.step("run-" ++ name, "Run " ++ name ++ " example").dependOn(&exe.run().step);
}