-- Test file for LSP diagnostics - lua_ls
-- This file intentionally contains different diagnostic levels
-- to test diagnostic virtual text colors in paper-tonic-modern

-- Define some valid code first
local valid_function = function()
  return "valid"
end

---@diagnostic disable-next-line: unused-local
local _ = valid_function()

-- ERROR: Undefined global (lua_ls marks this as error)
print(undefined_global_variable)

-- ERROR: Undefined function
undefined_function()

-- WARNING: Unused local variable (lua_ls warning level)
local unused_variable = "I'm never used"

-- WARNING: Lowercase global (should be local)
lowercase_global = "This should be local or uppercase"

-- HINT: Redundant parentheses (some configs treat as hint)
local x = (5)
print(x)

-- ERROR: Wrong number of arguments
local function takes_two_args(a, b)
  return a + b
end
takes_two_args(1)  -- Missing second argument (lua_ls error)

-- ERROR: Attempting to call a non-function
local not_a_function = "string"
not_a_function()

-- WARNING: Shadowing outer local
local shadow_me = 1
do
  local shadow_me = 2  -- Shadows outer local (warning)
  print(shadow_me)
end

-- ERROR: Invalid table access
local empty_table = {}
print(empty_table.nonexistent.deeply.nested.property)

-- WARNING/HINT: Can be simplified
if true == true then  -- Redundant comparison
  print("always true")
end

-- ERROR: Type annotation mismatch
---@type string
local should_be_string = 123  -- Assigning number to string type

-- WARNING: Unreachable code after return
local function has_dead_code()
  return "done"
  print("This will never execute")  -- Unreachable
end

-- Valid function call
print(takes_two_args(1, 2))

-- ERROR: Calling vim API that doesn't exist
vim.nonexistent_function()

-- HINT: Trailing whitespace or style issues (if configured)
local with_trailing_space = "value"   
print(with_trailing_space)

-- ERROR: Parameter type mismatch
---@param name string
---@param age number
local function greet(name, age)
  print("Hello, " .. name .. ", you are " .. age)
end
greet(123, "not a number")  -- Wrong types

print("Diagnostic test complete!")