local opt, api, cmd = vim.opt, vim.api, vim.cmd
local fn, ui = vim.fn, vim.ui

cmd.colorscheme("basic")

-- options ---------------------------------------------------------------------
opt.undofile = true
opt.backup = false
opt.writebackup = false
opt.mouse = {}
opt.title = true

opt.shortmess:append({ I = true })
opt.number = true
opt.relativenumber = true
opt.signcolumn = "number"
opt.textwidth = 80
opt.colorcolumn = "+1"

opt.showtabline = 2
opt.winbar = "%f%( %h%m%r%y%)"
opt.laststatus = 3

local statusline_group = api.nvim_create_augroup("Statusline", {})
local wordcount = fn.wordcount()
api.nvim_create_autocmd({ "TextChanged", "WinEnter", "BufEnter" }, {
  group = statusline_group,
  callback = function()
    wordcount = fn.wordcount()
  end
})
local cwd = fn.pathshorten(vim.fn.getcwd())
api.nvim_create_autocmd({ "DirChanged" }, {
  group = statusline_group,
  callback = function()
    cwd = fn.pathshorten(vim.fn.getcwd())
  end
})

function _G.statusline()
  return table.concat({
    cwd,
    " %=",
    " <%b> ",
    wordcount.visual_chars or wordcount.cursor_chars, "/", wordcount.chars, " ",
    wordcount.visual_words or wordcount.cursor_words, "/", wordcount.words
  })
end
opt.statusline = "%!v:lua.statusline()"

opt.ignorecase = true
opt.infercase = true
opt.smartcase = true
opt.smartindent = true
opt.clipboard = "unnamedplus"
opt.whichwrap = {
  ["b"] = true,
  ["s"] = true,
  ["h"] = true,
  ["l"] = true,
  ["<"] = true,
  [">"] = true,
  ["~"] = true,
  ["["] = true,
  ["]"] = true
}
opt.wildoptions = { "fuzzy" }
opt.wildignorecase = true

opt.path = ".,,**"

opt.completeopt = {
  "menuone",
  "preview",
}

local terminal_group = api.nvim_create_augroup("Terminal", {})
api.nvim_create_autocmd({ "TermOpen" }, {
  group = terminal_group,
  callback = function()
    local opt_l = vim.opt_local
    opt_l.number = false
    opt_l.relativenumber = false
  end
})

-- keymaps ---------------------------------------------------------------------
local keymap_set = vim.keymap.set

keymap_set( "n", "<esc>", function()
  cmd.nohlsearch()
end, { desc = "Stop the highlighting for the 'hlsearch' option" })

keymap_set("c", "<m-h>", "<left>", { desc = "Left in c-mode" })
keymap_set("c", "<m-l>", "<right>", { desc = "Right in c-mode" })

keymap_set("n", "<leader>f", ":find ", { desc = ":find" })
keymap_set("n", "<leader>b", ":buffer ", { desc = ":buffer" })
keymap_set("n", "<leader>h", ":help ", { desc = ":help" })

keymap_set("n", "<leader>s", function()
  vim.opt_local.spell = not(vim.opt_local.spell:get())
end, { desc = "Toggle spell" })

keymap_set("n", "<leader>m", "<cmd>make<cr>", { desc = ":make" })

keymap_set("n", "<leader>d", "<cmd>enew<cr><cmd>bd #<cr>", { desc = "Delete buffer" })
keymap_set("n", "<leader>D", "<cmd>bd<cr>", { desc = "Delete buffer and close window" })

keymap_set("n", "]b", "<cmd>bnext<cr>", { desc = "Next buffer" })
keymap_set("n", "[b", "<cmd>bprev<cr>", { desc = "Previous buffer" })
keymap_set("n", "]t", "<cmd>tabnext<cr>", { desc = "Next tab" })
keymap_set("n", "[t", "<cmd>tabprevious<cr>", { desc = "Previous tab" })
keymap_set("n", "]q", "<cmd>cnext<cr>zz", { desc = "Next quickfix item" })
keymap_set("n", "[q", "<cmd>cprev<cr>zz", { desc = "Previous quickfix item" })

keymap_set("n", "<leader>co", "<cmd>copen<cr>", { desc = "Open quickfix window" })
keymap_set("n", "<leader>cc", "<cmd>cclose<cr>", { desc = "Close quickfix window" })

keymap_set("n", "<leader>g", function()
  local pattern
  ui.input({ prompt = ":vimgrep " }, function(input)
    if not input then return end
    if input:match("/.+/[gjf]*") then
      pattern = input
    else
      pattern = ("/%s/g"):format(input)
    end
  end)
  if not pattern then return end
  local file
  ui.input({
    prompt = (":vimgrep %s "):format(pattern),
    default = "**/*"
  }, function(input)
      if not input then return end
    file = input
  end)
  if not file then return end
  cmd.vimgrep(pattern, file)
end)

-- netrw -----------------------------------------------------------------------
local g = vim.g

g.netrw_use_errorwindow = 0
g.netrw_banner = 0
g.netrw_bufsettings = "noma nomod nowrap ro nobl"
g.netrw_fastbrowse = 0

keymap_set("n", "<leader>.", "<cmd>Explore .<cr>",
  { desc = "Explore current working directory" })