{ config, lib, pkgs, ... }:
with lib;
let
  cfg = config.services.podman;

  podman-lib = import ./podman-lib.nix { inherit pkgs lib config; };

  createQuadletSource = name: buildDef:
    let
      buildConfig = podman-lib.deepMerge {
        Build = {
          AuthFile = buildDef.authFile;
          Environment = buildDef.environment;
          File = buildDef.file;
          ImageTag = [ "homemanager/${name}" ] ++ buildDef.tags;
          Label = buildDef.labels // { "nix.home-manager.managed" = true; };
          PodmanArgs = buildDef.extraPodmanArgs;
          SetWorkingDirectory = buildDef.workingDirectory;
          TLSVerify = buildDef.tlsVerify;
        };
        Install = {
          WantedBy = optionals buildDef.autoStart [
            "default.target"
            "multi-user.target"
          ];
        };
        Service = {
          TimeoutStartSec = 300;
          RemainAfterExit = "yes";
        };
        Unit = { Description = buildDef.description; };
      } buildDef.extraConfig;
    in ''
      # Automatically generated by home-manager for podman build configuration
      # DO NOT EDIT THIS FILE DIRECTLY
      #
      # ${name}.build
      ${podman-lib.toQuadletIni buildConfig}
    '';

  toQuadletInternal = name: buildDef: {
    assertions = podman-lib.buildConfigAsserts name buildDef.extraConfig;
    serviceName =
      "podman-${name}"; # quadlet service name: 'podman-<name>-build.service
    source = podman-lib.removeBlankLines (createQuadletSource name buildDef);
    resourceType = "build";
  };
in let
  buildDefinitionType = types.submodule ({ name, ... }: {
    options = {

      autoStart = mkOption {
        type = types.bool;
        default = true;
        description =
          "Whether to start the build on boot. Requires user lingering.";
      };

      authFile = mkOption {
        type = with types; nullOr path;
        default = null;
        description = "Path of the authentication file.";
      };

      description = mkOption {
        type = with types; nullOr str;
        default = "Service for build ${name}";
        defaultText = "Service for build \${name}";
        example = "My Build";
        description = "The description of the build.";
      };

      environment = mkOption {
        type = podman-lib.primitiveAttrs;
        default = { };
        example = literalExpression ''
          {
            VAR1 = "0:100";
            VAR2 = true;
            VAR3 = 5;
          }
        '';
        description = "Environment variables to set in the build.";
      };

      extraConfig = mkOption {
        type = podman-lib.extraConfigType;
        default = { };
        example = literalExpression ''
          {
            Build = {
              Arch = "aarch64";
            };
            Service = {
              TimeoutStartSec = 15;
            };
          }
        '';
        description = "INI sections and values to populate the Build Quadlet.";
      };

      extraPodmanArgs = mkOption {
        type = types.listOf types.str;
        default = [ ];
        example = [ "--retries 5" ];
        description = "Extra arguments to pass to the podman build command.";
      };

      file = mkOption {
        type = types.str;
        example = literalExpression ''
          `"xdg.configFile."containerfiles/my-img/Containerfile"`
          or
          `"https://github.com/.../my-img/Containerfile"`
        '';
        description =
          "Path to a Containerfile which contains instructions to build the image.";
      };

      tags = mkOption {
        type = with types; listOf str;
        default = [ ];
        description = ''
          Name associated with the build.
          First tag will always be "homemanager/<name>".
        '';
      };

      labels = mkOption {
        type = with types; attrsOf str;
        default = { };
        example = {
          app = "myapp";
          some-label = "somelabel";
        };
        description = "The labels to apply to the build.";
      };

      tlsVerify = mkOption {
        type = types.bool;
        default = true;
        description =
          "Require HTTPS and verification of certificates when contacting registries.";
      };

      workingDirectory = mkOption {
        type = with types; nullOr path;
        default = null;
        description = "WorkingDirectory of the systemd unit file.";
      };
    };
  });
in {
  options.services.podman.builds = mkOption {
    type = types.attrsOf buildDefinitionType;
    default = { };
    description = "Defines Podman build quadlet configurations.";
  };

  config = let buildQuadlets = mapAttrsToList toQuadletInternal cfg.builds;
  in mkIf cfg.enable {
    services.podman.internal.quadletDefinitions = buildQuadlets;
    assertions = flatten (map (build: build.assertions) buildQuadlets);

    xdg.configFile."podman/images.manifest".text =
      podman-lib.generateManifestText buildQuadlets;
  };
}