const std = @import("std");

pub fn build(b: *std.Build) void {
    // Standard target options allows the person running `zig build` to choose
    // what target to build for. Here we do not override the defaults, which
    // means any target is allowed, and the default is native. Other options
    // for restricting supported target set are available.
    const target = b.standardTargetOptions(.{});

    // Standard release options allow the person running `zig build` to select
    // between Debug, ReleaseSafe, ReleaseFast, and ReleaseSmall.
    const optimize = b.standardOptimizeOption(.{});

    const uploadexe = switch (target.result.os.tag) {
        .linux => b.addExecutable(.{ .name = "clipboard-upload", .root_source_file = b.path("src/main-linux.zig"), .target = target }),
        .windows => b.addExecutable(.{ .name = "clipboard-upload", .root_source_file = b.path("src/main-windows.zig"), .target = target }),
        else => std.process.exit(1),
    };

    const path = if (b.option(bool, "curl", "use external curl command") orelse false)
        "config/curl.zig"
    else
        "config/nocurl.zig";

    const enc_path = blk: {
        if (b.option(bool, "seperate-encryption", "use external encryption command") orelse false) {
            const encryptionexe = b.addExecutable(.{
                .name = "encrypt",
                .root_source_file = b.path("src/encrypt.zig"),
                .target = target,
                .optimize = optimize,
            });
            b.getInstallStep().dependOn(&b.addInstallArtifact(encryptionexe, .{}).step);
            break :blk "config/external_encryption.zig";
        } else {
            break :blk "config/sane_encryption.zig";
        }
    };

    configureExe(uploadexe, b, target, optimize, path, enc_path);

    const run_cmd = b.addRunArtifact(uploadexe);
    run_cmd.step.dependOn(b.getInstallStep());
    if (b.args) |args| {
        run_cmd.addArgs(args);
    }

    const run_step = b.step("run", "Run the app (uplaods clipboard contents)");
    run_step.dependOn(&run_cmd.step);

    const downloadexe = b.addExecutable(.{ .name = "clipboard-download", .root_source_file = b.path("src/download.zig"), .target = target });

    configureExe(downloadexe, b, target, optimize, path, enc_path);

    const run_download_cmd = b.addRunArtifact(downloadexe);
    run_download_cmd.step.dependOn(b.getInstallStep());
    if (b.args) |args| {
        run_download_cmd.addArgs(args);
    }

    const run_download_step = b.step("run-down", "Run the app (downloads clipboard contents)");
    run_download_step.dependOn(&run_download_cmd.step);
}

fn configureExe(exe: *std.Build.Step.Compile, b: *std.Build, target: std.Build.ResolvedTarget, mode: std.builtin.OptimizeMode, config_path: []const u8, enc_config_path: []const u8) void {
    exe.root_module.optimize = mode;
    if (target.result.os.tag == .linux) {
        exe.linkLibC();
        // LibX11 1.7.2: https://gitlab.freedesktop.org/xorg/lib/libx11/-/archive/libX11-1.7.2/libx11-libX11-1.7.2.tar.gz
        // LibXfixes 5.0.3: https://gitlab.freedesktop.org/xorg/lib/libxfixes/-/archive/libXfixes-5.0.3/libxfixes-libXfixes-5.0.3.tar.gz
        // XOrg Proto: https://gitlab.freedesktop.org/xorg/proto/xorgproto/-/archive/xorgproto-2021.5/xorgproto-xorgproto-2021.5.tar.gz
        // We can download the above by taking each url and processing in a
        // command e.g.:
        // curl <url> | tar xz --wildcards '*.h'
        exe.addIncludePath(b.path("libx11-libX11-1.7.2/include"));
        exe.addIncludePath(b.path("libxfixes-libXfixes-5.0.3/include"));
        exe.addIncludePath(b.path("xorgproto-xorgproto-2021.5/include"));

        // More than a little messy. We're grabbing libX11 and libXfixes from
        // the host, while using downloaded headers. This assumes debian
        // bullseye host, and also means you can't cross-compile from Windows.
        // TODO: Make this better
        // const dependent_objects = .{
        //     "/usr/lib/x86_64-linux-gnu/libX11.so.6",
        //     "/usr/lib/x86_64-linux-gnu/libXfixes.so.3",
        // };
        const dependent_objects = .{
            "/usr/lib/x86_64-linux-gnu/libX11.so.6",
            "/nix/store/wd7b3f9sqgs0flgicx213iiyzjb4jxqm-libXfixes-6.0.1/lib/libXfixes.so.3",
        };
        inline for (dependent_objects) |obj|
            exe.addObjectFile(.{ .cwd_relative = obj });
        // exe.addObjectFile(b.path(obj));
    }
    if (target.result.os.tag == .windows) {
        // woah...we don't actually need libc!
        exe.linkSystemLibrary("user32");
        exe.linkSystemLibrary("kernel32");
        exe.linkSystemLibrary("shell32");
    }

    exe.root_module.addImport("config", b.createModule(.{
        .root_source_file = b.path(config_path),
    }));
    exe.root_module.addImport("encryptionconfig", b.createModule(.{
        .root_source_file = b.path(enc_config_path),
    }));

    b.getInstallStep().dependOn(&b.addInstallArtifact(exe, .{}).step);
}