-- Encoding / basics
vim.opt.encoding = "utf-8"
vim.opt.number = true
vim.opt.relativenumber = true
vim.opt.wrap = false

-- Toggle relative numbers in insert mode
local auto_numbers = vim.api.nvim_create_augroup("auto_numbers", { clear = true })

vim.api.nvim_create_autocmd("InsertEnter", {
  group = auto_numbers,
  callback = function()
    vim.opt.relativenumber = false
  end,
})

vim.api.nvim_create_autocmd("InsertLeave", {
  group = auto_numbers,
  callback = function()
    vim.opt.number = true
    vim.opt.relativenumber = true
  end,
})

-- Files / UI
vim.opt.backup = false
vim.opt.swapfile = false
vim.opt.mouse = "n"
vim.opt.path:append("**")
vim.opt.wildmenu = true
vim.opt.lazyredraw = true
vim.opt.maxmempattern = 20000

-- Tabs
vim.opt.tabstop = 2
vim.opt.shiftwidth = 2
vim.opt.softtabstop = 2
vim.opt.expandtab = true
vim.opt.smarttab = true

-- Splits
vim.opt.splitbelow = true
vim.opt.splitright = true

-- Autoreload changed files on disk
vim.opt.autoread = true

local auto_reload = vim.api.nvim_create_augroup("auto_reload", { clear = true })

vim.api.nvim_create_autocmd({ "FocusGained", "BufEnter", "CursorHold", "CursorHoldI" }, {
  group = auto_reload,
  callback = function()
    -- Don't mess with special modes / cmdwin
    if vim.fn.getcmdwintype() ~= "" then return end
    local m = vim.fn.mode()
    if m:match("^[c]") then return end   -- command-line mode
    if m:match("^r") then return end     -- hit-enter / prompt
    if m == "!" then return end          -- shell / external cmd
    if m == "t" then return end          -- terminal-mode

    -- checktime triggers FileChangedShellPost when needed
    vim.cmd("checktime")
  end,
})

vim.api.nvim_create_autocmd("FileChangedShellPost", {
  group = auto_reload,
  callback = function()
    vim.notify("File changed on disk. Buffer reloaded.", vim.log.levels.WARN)
  end,
})

-- Odin: format on save
local odin = vim.api.nvim_create_augroup("odin", { clear = true })

vim.api.nvim_create_autocmd("BufWritePre", {
  group = odin,
  pattern = "*.odin",
  callback = function(args)
    -- Avoid formatting if no LSP attached
    local clients = vim.lsp.get_clients({ bufnr = args.buf })
    if #clients == 0 then return end

    -- Modern API; async=false keeps it "format-before-write"
    vim.lsp.buf.format({ bufnr = args.buf, async = false })
  end,
})

-- netrw
vim.g.netrw_bufsettings = "noma nomod nu nowrap ro nobl"

-- Eyecandy: cursorline only in active window
vim.opt.cursorline = true

local dynamic_cursorline = vim.api.nvim_create_augroup("dynamic_cursorline", { clear = true })

vim.api.nvim_create_autocmd({ "WinEnter", "BufEnter", "BufWinEnter" }, {
  group = dynamic_cursorline,
  callback = function()
    vim.opt_local.cursorline = true
  end,
})

vim.api.nvim_create_autocmd({ "WinLeave", "BufLeave", "BufWinLeave" }, {
  group = dynamic_cursorline,
  callback = function()
    vim.opt_local.cursorline = false
  end,
})

-- vim.cmd("highlight clear")
vim.opt.background = "dark"
vim.opt.termguicolors = true

vim.cmd.colorscheme "catppuccin"

-- Split / UI
vim.opt.fillchars = { vert = "│" }
vim.opt.signcolumn = "auto:2"

-- Neovim note: VertSplit highlight group was replaced by WinSeparator in newer versions.
-- Setting both keeps it working across versions/colorschemes.
vim.api.nvim_set_hl(0, "VertSplit",   { fg = "darkgray" })
vim.api.nvim_set_hl(0, "WinSeparator",{ fg = "darkgray" })

-- folds
vim.keymap.set("n", "<space>", "za", { desc = "Toggle fold" })
vim.opt.foldmethod = "indent"
vim.opt.foldenable = false  -- set nofoldenable