let
  lib = import <nixpkgs/lib>;
  codingRulesLib = (import ../../lib {inherit lib;}).coding-rules;

  # Test 1: instructions are generated correctly with custom rulesDir
  testInstructions = let
    rules = codingRulesLib.mkCodingRules {
      agents = "/tmp/fake-agents";
      languages = ["python"];
      concerns = ["naming"];
      rulesDir = ".coding-rules";
    };
  in
    assert rules.instructions
    == [
      ".coding-rules/concerns/naming.md"
      ".coding-rules/languages/python.md"
    ]; {result = "pass";};

  # Test 2: default rulesDir is .opencode-rules
  testDefaultRulesDir = let
    rules = codingRulesLib.mkCodingRules {
      agents = "/tmp/fake-agents";
    };
    hasCorrectPrefix = builtins.all (s: builtins.substring 0 15 s == ".opencode-rules") rules.instructions;
  in
    assert hasCorrectPrefix == true; {result = "pass";};

  # Test 3: shellHook contains both the symlink command and the config generation
  testShellHook = let
    rules = codingRulesLib.mkCodingRules {
      agents = "/tmp/fake-agents";
    };
    hook = rules.shellHook;
    hasSymlink = builtins.match ".*ln -sfn.*" hook != null;
    hasConfigGen = builtins.match ".*coding-rules.json.*" hook != null;
  in
    assert hasSymlink;
    assert hasConfigGen; {result = "pass";};
in {
  instructions-correct = testInstructions;
  default-rules-dir = testDefaultRulesDir;
  shell-hook = testShellHook;
}