const std = @import("std");
const Self = @This();

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

const root_path = root() ++ "/";
const package_path = root_path ++ "src/main.zig";
pub const include_dir = root_path ++ "zlib";
pub const Options = struct {
    import_name: ?[]const u8 = null,
};

pub const Library = struct {
    step: *std.build.LibExeObjStep,

    pub fn link(self: Library, other: *std.build.LibExeObjStep, opts: Options) void {
        other.addIncludePath(include_dir);
        other.linkLibrary(self.step);

        if (opts.import_name) |import_name|
            other.addPackagePath(import_name, package_path);
    }
};

pub fn create(b: *std.build.Builder, target: std.zig.CrossTarget, mode: std.builtin.Mode) Library {
    var ret = b.addStaticLibrary("z", null);
    ret.setTarget(target);
    ret.setBuildMode(mode);
    ret.linkLibC();
    ret.addCSourceFiles(srcs, &.{"-std=c89"});

    return Library{ .step = ret };
}

const srcs = &.{
    root_path ++ "zlib/adler32.c",
    root_path ++ "zlib/compress.c",
    root_path ++ "zlib/crc32.c",
    root_path ++ "zlib/deflate.c",
    root_path ++ "zlib/gzclose.c",
    root_path ++ "zlib/gzlib.c",
    root_path ++ "zlib/gzread.c",
    root_path ++ "zlib/gzwrite.c",
    root_path ++ "zlib/inflate.c",
    root_path ++ "zlib/infback.c",
    root_path ++ "zlib/inftrees.c",
    root_path ++ "zlib/inffast.c",
    root_path ++ "zlib/trees.c",
    root_path ++ "zlib/uncompr.c",
    root_path ++ "zlib/zutil.c",
};