# SPDX-License-Identifier: AGPL-3.0-or-later
{
  description = "A MOS6502 emulator written in Rust.";

  inputs = {
    nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";

    crane.url = "github:ipetkov/crane";

    # devenv dependencies
    devenv-root = {
      url = "file+file:///dev/null";
      flake = false;
    };
    flake-parts.url = "github:hercules-ci/flake-parts";
    devenv.url = "github:cachix/devenv";
    devenv.inputs.nixpkgs.follows = "nixpkgs";
    nix2container.url = "github:nlewo/nix2container";
    nix2container.inputs.nixpkgs.follows = "nixpkgs";
    mk-shell-bin.url = "github:rrbutani/nix-mk-shell-bin";

    # Custom template dependencies
    treefmt-nix.url = "github:numtide/treefmt-nix";
    treefmt-nix.inputs.nixpkgs.follows = "nixpkgs";
  };

  outputs = inputs @ {
    crane,
    flake-parts,
    devenv-root,
    ...
  }:
    flake-parts.lib.mkFlake {inherit inputs;} {
      imports = [
        inputs.devenv.flakeModule
        inputs.treefmt-nix.flakeModule
      ];

      systems = ["x86_64-linux" "i686-linux" "x86_64-darwin" "aarch64-linux" "aarch64-darwin"];

      perSystem = {
        config,
        pkgs,
        ...
      }: let
        craneLib = crane.mkLib pkgs;
        src = craneLib.cleanCargoSource ./.;

        commonArgs = {
          inherit src;
          strictDeps = true;
        };

        cargoArtifacts = craneLib.buildDepsOnly commonArgs;

        mos6502 = craneLib.buildPackage (commonArgs // {inherit cargoArtifacts;});
      in {
        checks = {
          inherit mos6502;
          mos6502-clippy = craneLib.cargoClippy (commonArgs
            // {
              inherit cargoArtifacts;
            });
          mos6502-nextest = craneLib.cargoNextest (commonArgs
            // {
              inherit cargoArtifacts;
              partitions = 1;
              partitionType = "count";
            });
        };

        packages.default = mos6502;

        devenv.shells.default = {
          devenv.root = let
            devenvRootFileContent = builtins.readFile devenv-root.outPath;
          in
            pkgs.lib.mkIf (devenvRootFileContent != "") devenvRootFileContent;

          imports = [./nix/devenv.nix];

          pre-commit.hooks.treefmt = {
            enable = true;
            packageOverrides.treefmt = config.treefmt.build.wrapper;
          };

          name = "my-project";
        };

        treefmt = {
          # Checked by pre-commit.
          flakeCheck = false;
          flakeFormatter = true;
          programs = {
            alejandra.enable = true;
            rustfmt.enable = true;
            statix.enable = true;
            taplo.enable = true;
          };
          projectRootFile = "flake.nix";
        };
      };
    };
}