# This is a helper file for people using NixOS as their operating system.
# If you don't know what this file does, you can safely ignore it.
# This file defines both the development environment for the project.
#
# Development Environment:
# - Provides all necessary tools for Rust/WASM development
# - Includes Tauri dependencies for desktop app development
# - Sets up profiling and debugging tools
# - Configures mold as the default linker for faster builds
#
#
# Usage:
# - Development shell: `nix develop`
# - Run in dev shell with direnv: add `use flake` to .envrc
{
  description = "Development environment and build configuration";

  inputs = {
    # This url should be changed to match your system packages if you work on tauri because you need to use the same graphics library versions as the ones used by your system
    nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
    nixpkgs-unstable.url = "github:nixos/nixpkgs/nixos-unstable";
    rust-overlay = {
      url = "github:oxalica/rust-overlay";
      inputs.nixpkgs.follows = "nixpkgs";
    };
    flake-utils.url = "github:numtide/flake-utils";

    # This is used to provide a identical development shell at `shell.nix` for users that do not use flakes
    flake-compat.url = "https://flakehub.com/f/edolstra/flake-compat/1.tar.gz";
  };

  outputs = { nixpkgs, nixpkgs-unstable, rust-overlay, flake-utils, ... }:
    flake-utils.lib.eachDefaultSystem (system:
      let
        overlays = [ (import rust-overlay) ];
        pkgs = import nixpkgs {
          inherit system overlays;
        };
        pkgs-unstable = import nixpkgs-unstable {
          inherit system overlays;
        };

        rustc-wasm = pkgs.rust-bin.stable.latest.default.override {
          targets = [ "wasm32-unknown-unknown" ];
          extensions = [ "rust-src" "rust-analyzer" "clippy" "cargo" ];
        };

        libcef = pkgs.libcef.overrideAttrs (finalAttrs: previousAttrs: {
          version = "138.0.26";
          gitRevision = "84f2d27";
          chromiumVersion = "138.0.7204.158";
          srcHash = "sha256-d9jQJX7rgdoHfROD3zmOdMSesRdKE3slB5ZV+U2wlbQ=";

          __intentionallyOverridingVersion = true;

          postInstall = ''
            strip $out/lib/*
          '';
        });

        libcefPath = pkgs.runCommand "libcef-path" {} ''
          mkdir -p $out

          ln -s ${libcef}/include $out/include
          find ${libcef}/lib -type f -name "*" -exec ln -s {} $out/ \;
          find ${libcef}/libexec -type f -name "*" -exec ln -s {} $out/ \;
          cp -r ${libcef}/share/cef/* $out/

          echo '${builtins.toJSON {
            type = "minimal";
            name = builtins.baseNameOf libcef.src.url;
            sha1 = "";
          }}' > $out/archive.json
        '';

        # Shared build inputs - system libraries that need to be in LD_LIBRARY_PATH
        buildInputs = with pkgs; [
          # System libraries
          wayland
          wayland.dev
          openssl
          vulkan-loader
          mesa
          libraw
          libGL
        ];

        # Development tools that don't need to be in LD_LIBRARY_PATH
        buildTools =  [
          rustc-wasm
          pkgs.nodejs
          pkgs.nodePackages.npm
          pkgs.binaryen
          pkgs.wasm-bindgen-cli
          pkgs-unstable.wasm-pack
          pkgs.pkg-config
          pkgs.git
          pkgs.gobject-introspection
          pkgs-unstable.cargo-tauri
          pkgs-unstable.cargo-about

          # Linker
          pkgs.mold
        ];
        # Development tools that don't need to be in LD_LIBRARY_PATH
        devTools = with pkgs; [
          cargo-watch
          cargo-nextest
          cargo-expand

          # Profiling tools
          gnuplot
          samply
          cargo-flamegraph
        ];
      in
      {
        # Development shell configuration
        devShells.default = pkgs.mkShell {
          packages = buildInputs ++ buildTools ++ devTools;

          LD_LIBRARY_PATH = "${pkgs.lib.makeLibraryPath buildInputs}:${libcefPath}";
          CEF_PATH = libcefPath;
          XDG_DATA_DIRS="${pkgs.gsettings-desktop-schemas}/share/gsettings-schemas/${pkgs.gsettings-desktop-schemas.name}:${pkgs.gtk3}/share/gsettings-schemas/${pkgs.gtk3.name}:$XDG_DATA_DIRS";

          shellHook = ''
            alias cargo='mold --run cargo'
          '';
        };
      }
    );
}