{
  description = "spacial-data-experiments";

  inputs = {
    nixpkgs.url = "github:nixos/nixpkgs?ref=nixos-unstable";
    flake-utils.url = "github:numtide/flake-utils";
    quebec-cities-poly = {
      url = "github:didiercrunch/cities";
      flake = false;
    };
  };
  outputs = { self, nixpkgs, flake-utils, quebec-cities-poly }:
    flake-utils.lib.eachDefaultSystem (system:
      let
        pkgs = nixpkgs.legacyPackages.${system};

        # osm-data = pkgs.fetchurl {
        #   url =
        #     "https://static.home.all-dressed-programming.com/download.geofabrik.de/north-america/canada/quebec-241223.osm.pbf";
        #   hash = "sha256-JkDJxODHnZQLK4+5Bjdu5GkbmHSK9TPt2ep6nsykCRg=";
        # };

        poly2geojson = pkgs.rustPlatform.buildRustPackage rec {
          pname = "poly2geojson";
          version = "0.1.3";

          src = pkgs.fetchFromGitHub {
            owner = "frafra";
            repo = pname;
            rev = "2fbf2383765fe043d43d53b91ddbfe50c0129bb1";
            hash = "sha256-BMRl6fRqQlibuGxg5hBHz7r1cvionNYEZe9YcZuL0oU=";
          };
          cargoHash = "sha256-pCegHF6SsCIsCQ/b+N34xTMjw2PjPB0pi30Y9sWIcV4=";
        };

        osmosis = pkgs.stdenv.mkDerivation {
          name = "osmosis";
          src = pkgs.fetchzip {
            url =
              "https://github.com/openstreetmap/osmosis/releases/download/0.49.2/osmosis-0.49.2.zip";
            hash = "sha256-hmD/pnEEJsl2NkODon4XZcZ3ZQ7+fx/JvWTR4xrRoug=";
          };
          buildInputs = [ ];
          buildPhase = "";
          installPhase = ''
            cp -r . $out
          '';
        };

        custom-osmium-tool = pkgs.stdenv.mkDerivation rec {
          pname = "osmium-tool";
          version = "1.16.0";

          src = pkgs.fetchFromGitHub {
            owner = "osmcode";
            repo = "osmium-tool";
            rev = "8ed94a5da2a24b233a77732bfaa8c75fc32ea505";
            sha256 = "sha256-YxjInUqcVfrBvAdBA/pd2J7NEBp6FvoQ97S+aW9x7jE=";
          };

          nativeBuildInputs = with pkgs; [ cmake installShellFiles pandoc ];

          buildInputs = with pkgs; [
            boost
            bzip2
            expat
            libosmium
            lz4
            protozero
            zlib
            nlohmann_json
          ];

          doCheck = false;

          postInstall = ''
            installShellCompletion --zsh ../zsh_completion/_osmium
          '';
        };

        geofabrik-base-url =
          "https://static.home.all-dressed-programming.com/download.geofabrik.de/north-america/canada/";

        osm-quebec."2020" = pkgs.fetchurl {
          url = "${geofabrik-base-url}quebec-200101.osm.pbf";
          hash =
            "sha256-458a33e10a3fc70884541a00e314471e9b7c92f352fe61ec909066478fb7bd09";
        };
        osm-quebec."2021" = pkgs.fetchurl {
          url = "${geofabrik-base-url}quebec-210101.osm.pbf";
          hash =
            "sha256-90a8bfe610951da56f315140256a4918fc9b98ac03bb441778f8a66271c128a9";
        };
        osm-quebec."2022" = pkgs.fetchurl {
          url = "${geofabrik-base-url}quebec-220101.osm.pbf";
          hash =
            "sha256-899526faf3220c7e9ec9fe2499e7ba3bccfe94dfefa328c0b7846dce6494e96a";
        };
        osm-quebec."2023" = pkgs.fetchurl {
          url = "${geofabrik-base-url}quebec-230101.osm.pbf";
          hash = "sha256-AReFCvBIz42RBcOYgC25ZJaBXADW1lIzSpCI+vdrWX0=";
        };
        osm-quebec."2024" = pkgs.fetchurl {
          url = "${geofabrik-base-url}quebec-240101.osm.pbf";
          hash = "sha256-lcbn4mks4NlnwU3QwQOFdLICxFGapDC0PR/h0HlIR1E=";
        };
        osm-quebec."2025" = pkgs.fetchurl {
          url = "${geofabrik-base-url}quebec-250101.osm.pbf";
          hash = "sha256-QLIflsZuv8r2+mGVARrGkXyjWZ7qGzdSODpVka8iK8c=";
        };

        data-dir = osm-data:
          pkgs.stdenv.mkDerivation {
            name = "data-dir";
            src = ./scripts;
            buildInputs =
              [ poly2geojson pkgs.jdk23 osmosis custom-osmium-tool ];
            buildPhase = ''
              mkdir -p cities/canada/quebec
              cp ${quebec-cities-poly}/canada/quebec/* cities/canada/quebec
              chmod u+w cities/canada/quebec
              ${pkgs.babashka}/bin/bb  to-geojson.clj --osm-file ${osm-data} --paths cities/canada/quebec/mon*.poly
            '';
            installPhase = ''
              cp -r cities $out
            '';
          };

        historical-data-dir = pkgs.stdenv.mkDerivation {
          name = "historical-data-dir";
          src = ./scripts;
          buildInputs = [ ];
          buildPhase = "";
          installPhase = ''
            mkdir -p $out
            ln -s ${data-dir osm-quebec."2023"} $out/2023
            ln -s ${data-dir osm-quebec."2024"} $out/2024
            ln -s ${data-dir osm-quebec."2025"} $out/2025
          '';
        };

        python-virtual-env = pkgs.python312.withPackages (ps: [
          ps.matplotlib
          ps.jupyter
          ps.tqdm
          ps.duckdb
          ps.pandas
          ps.unidecode
          ps.geopy
          ps.click
          ps.jinja2
        ]);
      in {
        packages = {
          default = data-dir;
          poly2geojson = poly2geojson;
          osmosis = osmosis;
          historical-data-dir = historical-data-dir;
        };
        devShell = pkgs.mkShell {
          name = "spacial-data-experiments";
          buildInputs = with pkgs; [
            duckdb
            http-server
            sqlfluff
            poly2geojson
            gdal
            custom-osmium-tool
            python-virtual-env
          ];
        };
      });
}