# OpenCode development environment with AI coding rules
# This shell demonstrates the mkOpencodeRules library provided by this repository
# Usage: nix develop .#opencode
#
# To enable OpenCode rules, add the agents input to your flake:
#   agents = {
#     url = "git+https://code.m3ta.dev/m3tam3re/AGENTS";
#     flake = false;
#   };
{
  pkgs,
  lib ? pkgs.lib,
  inputs ? null,
  agents ? null,
}: let
  # Import the opencode-rules library
  m3taLib = import ../lib {lib = pkgs.lib;};

  # Import custom packages
  customPackages = import ../pkgs {inherit pkgs inputs;};

  # Create rules configuration only if agents input is provided
  # This demonstrates how to use mkOpencodeRules in a real project
  rulesConfig = lib.optionalAttrs (agents != null) {
    rules = m3taLib.opencode-rules.mkOpencodeRules {
      # Pass the AGENTS repository path
      inherit agents;

      # Languages relevant to this repository
      languages = ["python" "typescript" "nix"];

      # Frameworks used in this repo
      frameworks = ["n8n"];

      # Standard concerns for development
      concerns = [
        "coding-style"
        "naming"
        "documentation"
        "testing"
        "git-workflow"
        "project-structure"
      ];
    };
  };
in
  pkgs.mkShell {
    name = "opencode-dev";

    # Development tools
    buildInputs = with pkgs;
      [
        # OpenCode AI coding agent (if inputs are available)
      ]
      ++ lib.optionals (inputs != null)
      [inputs.opencode.packages.${pkgs.system}.opencode]
      ++ [
        # Task management for AI coding sessions
        customPackages.td

        # Companion tool for CLI agents (diffs, file trees, task management)
        customPackages.sidecar

        # Code analysis tools
        customPackages.code2prompt

        # Nix development tools (for this repo)
        nil
        alejandra
        statix
        deadnix
      ];

    # Shell hook that sets up OpenCode rules
    shellHook = ''
      echo "🤖 OpenCode Development Environment"
      echo ""
      echo "This environment demonstrates the mkOpencodeRules library"
      echo "provided by the m3ta-nixpkgs repository."
      echo ""

      ${
        if (agents != null)
        then ''
          # Execute the OpenCode rules shellHook
          ${rulesConfig.rules.shellHook}

          echo "✅ OpenCode rules configured!"
        ''
        else ''
          echo "⚠️  OpenCode rules not configured"
          echo ""
          echo "To enable OpenCode rules, add the agents input to your flake.nix:"
          echo ""
          echo "  inputs = {"
          echo "    m3ta-nixpkgs.url = \"git+https://code.m3ta.dev/m3tam3re/nixpkgs\";"
          echo "    agents = {"
          echo "      url = \"git+https://code.m3ta.dev/m3tam3re/AGENTS\";"
          echo "      flake = false;"
          echo "    };"
          echo "  };"
          echo ""
          echo "Then pass agents to the shell:"
          echo "  opencode = import ./opencode.nix { inherit pkgs inputs agents; };"
        ''
      }

      echo ""
      echo "Available tools:"
      echo "  opencode          - AI coding agent"
      echo "  td usage --new-session - View current tasks"
      echo "  sidecar           - Companion tool (diffs, file trees, tasks)"
      echo "  code2prompt       - Convert code to prompts"
      echo ""
      echo "Nix development tools:"
      echo "  nix flake check    - Check flake validity"
      echo "  nix fmt .          - Format Nix files"
      echo "  statix check .     - Lint Nix files"
      echo "  deadnix .          - Find dead code"
      echo ""
      ${
        if (agents == null)
        then ''
          echo "💡 Using mkOpencodeRules in your project:"
          echo ""
          echo "Add to your flake.nix:"
          echo "  inputs = {"
          echo "    m3ta-nixpkgs.url = \"git+https://code.m3ta.dev/m3tam3re/nixpkgs\";"
          echo "    agents = {"
          echo "      url = \"git+https://code.m3ta.dev/m3tam3re/AGENTS\";"
          echo "      flake = false;"
          echo "    };"
          echo "  };"
          echo ""
          echo "  outputs = {self, nixpkgs, m3ta-nixpkgs, agents, ...}:"
          echo "    let"
          echo "      system = \"x86_64-linux\";"
          echo "      pkgs = nixpkgs.legacyPackages.''${system};"
          echo "      m3taLib = m3ta-nixpkgs.lib.''${system};"
          echo "      rules = m3taLib.opencode-rules.mkOpencodeRules {"
          echo "        inherit agents;"
          echo "        languages = [\"python\" \"typescript\"];"
          echo "        frameworks = [\"n8n\"];"
          echo "      };"
          echo "    in {"
          echo "      devShells.''${system}.default = pkgs.mkShell {"
          echo "        shellHook = rules.shellHook;"
          echo "      };"
          echo "    };"
        ''
        else ""
      }
      echo ""
    '';
  }