{ config, lib, pkgs, ... }:

with lib;

let
  cfg = config.services.ai-skills;

  skillsList = ''
    Available skills:
    - niri-window-capture: Invisibly capture window screenshots
    - screenshot-latest: Find latest screenshots
    - tufte-press: Generate study card JSON
    - worklog: Create org-mode worklogs
    - update-spec-kit: Update spec-kit ecosystem
    - update-opencode: Update OpenCode via Nix
    - web-search: Search the web via Claude
    - web-research: Deep web research with multiple backends
  '';
in {
  options.services.ai-skills = {
    enable = mkEnableOption "AI agent skills for Claude Code and OpenCode";

    skillsPath = mkOption {
      type = types.path;
      default = null;
      description = "Path to skills repository (e.g., ~/proj/skills/skills)";
    };

    # Per-target skill lists
    claudeCodeSkills = mkOption {
      type = types.listOf types.str;
      default = [];
      description = "Skills to deploy to Claude Code (~/.claude/skills/). ${skillsList}";
      example = [ "worklog" "niri-window-capture" ];
    };

    openCodeSkills = mkOption {
      type = types.listOf types.str;
      default = [];
      description = "Skills to deploy to OpenCode (~/.config/opencode/skills/). ${skillsList}";
      example = [ "worklog" "web-search" ];
    };
  };

  config = mkIf cfg.enable {
    home.file = mkMerge [
      # Claude Code skills
      (mkIf (cfg.claudeCodeSkills != []) (
        builtins.listToAttrs (
          map (skillName: {
            name = ".claude/skills/${skillName}";
            value = {
              source = "${cfg.skillsPath}/${skillName}";
              recursive = true;
            };
          }) cfg.claudeCodeSkills
        )
      ))

      # OpenCode skills
      (mkIf (cfg.openCodeSkills != []) (
        builtins.listToAttrs (
          map (skillName: {
            name = ".config/opencode/skills/${skillName}";
            value = {
              source = "${cfg.skillsPath}/${skillName}";
              recursive = true;
            };
          }) cfg.openCodeSkills
        )
      ))
    ];
  };
}