const std = @import("std");
const GitRepoStep = @import("GitRepoStep.zig");

pub fn build(b: *std.build.Builder) void {
    const zfetch_repo = GitRepoStep.create(b, .{
        .url = "https://github.com/truemedian/zfetch",
        // .branch = "0.1.10", // branch also takes tags. Tag 0.1.10 isn't quite new enough
        .sha = "271cab5da4d12c8f08e67aa0cd5268da100e52f1",
    });
    // 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 mode = b.standardReleaseOptions();

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

    configureExe(uploadexe, b, target, mode, zfetch_repo);

    const run_cmd = uploadexe.run();
    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("clipboard-download", "src/download.zig");

    configureExe(downloadexe, b, target, mode, zfetch_repo);

    const run_download_cmd = downloadexe.run();
    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.LibExeObjStep, b: *std.build.Builder, target: std.zig.CrossTarget, mode: std.builtin.Mode, zfetch_repo: anytype) void {
    exe.setTarget(target);
    exe.setBuildMode(mode);
    if (target.getOs().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.addIncludeDir("libx11-libX11-1.7.2/include");
        exe.addIncludeDir("libxfixes-libXfixes-5.0.3/include");
        exe.addIncludeDir("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",
        };
        inline for (dependent_objects) |obj|
            exe.addObjectFile(obj);
    }
    if (target.getOs().tag == .windows) {
        // woah...we don't actually need libc!
        exe.linkSystemLibrary("user32");
        exe.linkSystemLibrary("kernel32");
        exe.linkSystemLibrary("shell32");
    }
    const copy_deps = std.build.RunStep.create(b, "copy zfetch deps");
    copy_deps.addArgs(&[_][]const u8{
        "cp",
        "zfetch_deps.zig",
        "libs/zfetch/deps.zig",
    });
    copy_deps.step.dependOn(&zfetch_repo.step);

    // exe.step.dependOn(&zfetch_repo.step);
    exe.step.dependOn(&copy_deps.step);

    // This import won't work unless we're already cloned. The way around
    // this is to have a multi-stage build process, but that's a lot of work.
    // Instead, I've copied the addPackage and tweaked it for the build prefix
    // so we'll have to keep that in sync with upstream
    // const zfetch = @import("libs/zfetch/build.zig");
    const zpkg = getZfetchPackage(b, "libs/zfetch") catch unreachable;
    exe.addPackage(zpkg);
    exe.addPackage(.{
        .name = "iguanaTLS",
        .path = .{ .path = "libs/zfetch/libs/iguanaTLS/src/main.zig" },
    });
    exe.install();
}

fn getDependency(comptime lib_prefix: []const u8, comptime name: []const u8, comptime root: []const u8) !std.build.Pkg {
    const path = lib_prefix ++ "/libs/" ++ name ++ "/" ++ root;

    // We don't actually care if the dependency has been checked out, as
    // GitRepoStep will handle that for us
    // Make sure that the dependency has been checked out.
    // std.fs.cwd().access(path, .{}) catch |err| switch (err) {
    //     error.FileNotFound => {
    //         std.log.err("zfetch: dependency '{s}' not checked out", .{name});
    //
    //         return err;
    //     },
    //     else => return err,
    // };

    return std.build.Pkg{
        .name = name,
        .path = .{ .path = path },
    };
}
pub fn getZfetchPackage(b: *std.build.Builder, comptime lib_prefix: []const u8) !std.build.Pkg {
    var dependencies = b.allocator.alloc(std.build.Pkg, 4) catch unreachable;

    dependencies[0] = try getDependency(lib_prefix, "iguanaTLS", "src/main.zig");
    dependencies[1] = try getDependency(lib_prefix, "network", "network.zig");
    dependencies[2] = try getDependency(lib_prefix, "uri", "uri.zig");
    dependencies[3] = try getDependency(lib_prefix, "hzzp", "src/main.zig");

    return std.build.Pkg{
        .name = "zfetch",
        .path = .{ .path = lib_prefix ++ "/src/main.zig" },
        .dependencies = dependencies,
    };
}