# Gradle's toolchain support does not work with IntelliJ, thus we have to use buildFHSUserEnv
# https://discourse.nixos.org/t/how-to-create-a-development-environment-with-intellij-idea-and-openjdk/10153

# How to use `config.allowUnfree` in shell.nix
# https://github.com/NixOS/nixpkgs/issues/166220#issuecomment-1745803058

{
  ### Import nixpkgs as channels ###
  #
  # nixpkgs stable
  #pkgs ? import <nixpkgs> {
  #   # Required for IntelliJ Ultimate
  #   config.allowUnfree = true;
  #},
  # nixpkgs unstable
  #unstable ? import <unstable> { }
}:

let
  ### Import nixpkgs with Niv ###
  #
  sources = import ./nix/sources.nix;
  # nixpkgs stable
  pkgs = import sources.nixpkgs {
    # Required for IntelliJ Ultimate
    config.allowUnfree = true;
  };
  # nixpkgs unstable
  unstable = import sources.unstable { };

  jdk = unstable.jdk23;
  gradle = unstable.gradle.override {
    java = jdk;
    # Required for `gradle javaToolchains` to list JDK23
    javaToolchains = [ jdk ];
  };
in

(
  pkgs.buildFHSUserEnv
  {
    name = "intellij-gradle-jdk23";
    targetPkgs = pkgs_: [
      pkgs_.jetbrains.idea-ultimate
      # IntelliJ needs at least one font installed.
      # If this shell.nix is run on a non-NixOS system, that might not be the case.
      # Thus, we manually add one font.
      pkgs_.noto-fonts
      jdk
      gradle
    ];
  }
).env