local M = {}

M.test_count = 0
M.pass_count = 0
M.fail_count = 0
M.failures = {}

M.REF_PROJECT = os.getenv("SCL_REF_PROJECT") or "/home/lazar/dev/siemens/projects/scl_lang_support_lazyvim_ref_project"

local function inspect(val)
  local _G = {}
  setmetatable(_G, {__index = function(_, k)
    return function(v)
      if type(v) == "string" then return string.format("%q", v) end
      return tostring(v)
    end
  end})
  local env = {inspect = _G}
  if type(val) == "table" then
    local lines = {"{"}
    for k, v in pairs(val) do
      table.insert(lines, string.format("  [%s] = %s,", inspect(k), inspect(v)))
    end
    table.insert(lines, "}")
    return table.concat(lines, "\n")
  elseif type(val) == "string" then
    return string.format("%q", val)
  else
    return tostring(val)
  end
end

function M.assert(condition, message)
  M.test_count = M.test_count + 1
  if condition then
    M.pass_count = M.pass_count + 1
    return true
  else
    M.fail_count = M.fail_count + 1
    table.insert(M.failures, {
      test = message or "unnamed test",
      msg = "assertion failed"
    })
    return false
  end
end

function M.assert_equals(actual, expected, message)
  M.test_count = M.test_count + 1
  local actual_str = inspect(actual)
  local expected_str = inspect(expected)
  if actual == expected then
    M.pass_count = M.pass_count + 1
    return true
  else
    M.fail_count = M.fail_count + 1
    table.insert(M.failures, {
      test = message or "assert_equals",
      msg = string.format("expected: %s, got: %s", expected_str, actual_str)
    })
    return false
  end
end

function M.assert_not_nil(value, message)
  M.test_count = M.test_count + 1
  if value ~= nil then
    M.pass_count = M.pass_count + 1
    return true
  else
    M.fail_count = M.fail_count + 1
    table.insert(M.failures, {
      test = message or "assert_not_nil",
      msg = "value is nil"
    })
    return false
  end
end

function M.assert_nil(value, message)
  M.test_count = M.test_count + 1
  if value == nil then
    M.pass_count = M.pass_count + 1
    return true
  else
    M.fail_count = M.fail_count + 1
    table.insert(M.failures, {
      test = message or "assert_nil",
      msg = string.format("expected nil, got: %s", inspect(value))
    })
    return false
  end
end

function M.assert_gt(actual, expected, message)
  M.test_count = M.test_count + 1
  if actual > expected then
    M.pass_count = M.pass_count + 1
    return true
  else
    M.fail_count = M.fail_count + 1
    table.insert(M.failures, {
      test = message or "assert_gt",
      msg = string.format("expected %s > %s", tostring(actual), tostring(expected))
    })
    return false
  end
end

function M.assert_items_equal(actual, expected, message)
  M.test_count = M.test_count + 1
  if not actual or not expected then
    M.fail_count = M.fail_count + 1
    table.insert(M.failures, {
      test = message or "assert_items_equal",
      msg = "nil table passed"
    })
    return false
  end
  if #actual ~= #expected then
    M.fail_count = M.fail_count + 1
    table.insert(M.failures, {
      test = message or "assert_items_equal",
      msg = string.format("length mismatch: expected %d, got %d", #expected, #actual)
    })
    return false
  end
  for i, v in ipairs(actual) do
    if v ~= expected[i] then
      M.fail_count = M.fail_count + 1
      table.insert(M.failures, {
        test = message or "assert_items_equal",
        msg = string.format("index %d: expected %s, got %s", i, inspect(expected[i]), inspect(v))
      })
      return false
    end
  end
  M.pass_count = M.pass_count + 1
  return true
end

function M.reset()
  M.test_count = 0
  M.pass_count = 0
  M.fail_count = 0
  M.failures = {}
end

function M.report()
  print(string.format("\n=== Test Results ==="))
  print(string.format("Total: %d | Passed: %d | Failed: %d", M.test_count, M.pass_count, M.fail_count))
  if M.fail_count > 0 then
    print("\nFailures:")
    for _, f in ipairs(M.failures) do
      print(string.format("  - %s: %s", f.test, f.msg))
    end
  end
  return M.fail_count == 0
end

function M.run_suite(name, fn)
  print(string.format("\n=== Running %s ===", name))
  M.reset()
  fn()
  M.report()
end

return M