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";};

  # Test 4: forPi=false does not include AGENTS.md logic in shellHook
  testForPiDisabled = let
    rules = codingRulesLib.mkCodingRules {
      agents = "/tmp/fake-agents";
      forPi = false;
    };
    hook = rules.shellHook;
    hasPiBlock = builtins.match ".*CODING-RULES:START.*" hook != null;
  in
    assert hasPiBlock == false; {result = "pass";};

  # Test 5: forPi=true adds CODING-RULES markers to shellHook (when agents path has rules)
  # Note: This test uses the real AGENTS repo at /home/sascha.koenig/p/AI/AGENTS
  # It is only run when the path exists.
  testForPiEnabled = let
    agentsPath = /home/sascha.koenig/p/AI/AGENTS;
    rules = codingRulesLib.mkCodingRules {
      agents = agentsPath;
      forPi = true;
      concerns = ["coding-style"];
      languages = [];
      frameworks = [];
    };
    hook = rules.shellHook;
    hasPiBlock = builtins.match ".*CODING-RULES:START.*" hook != null;
    hasCodingStyle = builtins.match ".*Coding Style.*" hook != null;
  in
    assert hasPiBlock == true;
    assert hasCodingStyle == true; {result = "pass";};

  # Test 6: concatRulesMd produces concatenated markdown (with real agents path)
  testConcatRulesMd = let
    agentsPath = /home/sascha.koenig/p/AI/AGENTS;
    md = codingRulesLib.concatRulesMd {
      agents = agentsPath;
      concerns = ["coding-style"];
      languages = [];
      frameworks = [];
    };
    hasHeader = builtins.match ".*Coding Style.*" md != null;
    hasCritical = builtins.match ".*Critical Rules.*" md != null;
  in
    assert hasHeader == true;
    assert hasCritical == true; {result = "pass";};

  # Test 7: mkRulesMdSection wraps content with markers
  testRulesMdSection = let
    agentsPath = /home/sascha.koenig/p/AI/AGENTS;
    section = codingRulesLib.mkRulesMdSection {
      agents = agentsPath;
      concerns = ["coding-style"];
      languages = [];
      frameworks = [];
    };
    hasStartMarker = builtins.match ".*CODING-RULES:START.*" section != null;
    hasEndMarker = builtins.match ".*CODING-RULES:END.*" section != null;
    hasHeader = builtins.match ".*# Coding Rules.*" section != null;
  in
    assert hasStartMarker == true;
    assert hasEndMarker == true;
    assert hasHeader == true; {result = "pass";};
in {
  instructions-correct = testInstructions;
  default-rules-dir = testDefaultRulesDir;
  shell-hook = testShellHook;
  forpi-disabled = testForPiDisabled;
  forpi-enabled = testForPiEnabled;
  concat-rules-md = testConcatRulesMd;
  rules-md-section = testRulesMdSection;
}