# SPDX-License-Identifier: Unlicense
{
  inputs = {
    flake-parts.url = "github:hercules-ci/flake-parts";
    nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
    # systems.url = "github:nix-systems/default";

    treefmt-nix.url = "github:numtide/treefmt-nix";

    rust-overlay.url = "github:oxalica/rust-overlay";
    crane.url = "github:ipetkov/crane";
  };

  # Add settings for your binary cache.
  # nixConfig = {
  #   extra-substituters = [
  #   ];
  #   extra-trusted-public-keys = [
  #   ];
  # };

  outputs = inputs @ {
    nixpkgs,
    flake-parts,
    ...
  }: let
    # For details on these options, See
    # https://github.com/oxalica/rust-overlay?tab=readme-ov-file#cheat-sheet-common-usage-of-rust-bin
    #
    # Channel of the Rust toolchain (stable or beta).
    rustChannel = "stable";
    # Version (latest or specific date/semantic version)
    rustVersion = "latest";
    # Profile (default or minimal)
    rustProfile = "default";
  in
    flake-parts.lib.mkFlake {inherit inputs;} {
      systems = nixpkgs.lib.systems.flakeExposed;

      imports = [
        inputs.treefmt-nix.flakeModule
      ];

      perSystem = {
        config,
        system,
        pkgs,
        lib,
        craneLib,
        commonArgs,
        ...
      }: {
        _module.args = {
          pkgs = import nixpkgs {
            inherit system;
            overlays = [inputs.rust-overlay.overlays.default];
          };
          craneLib = (inputs.crane.mkLib pkgs).overrideToolchain (
            pkgs: pkgs.rust-bin.${rustChannel}.${rustVersion}.${rustProfile}
          );
          commonArgs = {
            # Depending on your code base, you may have to customize the
            # source filtering to include non-standard files during the build.
            # See
            # https://crane.dev/source-filtering.html?highlight=source#source-filtering
            src = craneLib.cleanCargoSource (craneLib.path ./.);

            nativeBuildInputs = with pkgs; [
              pkg-config
            ];

            buildInputs = with pkgs; [
              openssl
            ];
          };
        };

        # Build the executable package.
        packages.default = craneLib.buildPackage (
          commonArgs
          // {
            cargoArtifacts = craneLib.buildDepsOnly commonArgs;
          }
        );

        devShells.default = craneLib.devShell {
          packages =
            (commonArgs.nativeBuildInputs or [])
            ++ (commonArgs.buildInputs or [])
            ++ [pkgs.rust-analyzer-unwrapped];

          RUST_SRC_PATH = "${
            pkgs.rust-bin.${rustChannel}.${rustVersion}.rust-src
          }/lib/rustlib/src/rust/library";
        };

        treefmt = {
          projectRootFile = "Cargo.toml";
          programs = {
            actionlint.enable = true;
            nixfmt.enable = true;
            rustfmt.enable = true;
          };
        };
      };
    };
}