local misc = require("core.misc")
local auto = misc.auto

-- color stuff
if vim.fn.has("termguicolors") then
  vim.opt.termguicolors = true
end

-- numbers
vim.opt.number = true
vim.opt.relativenumber = true

-- buffer
vim.opt.scrolloff = 5
vim.opt.wrap = true -- wraping lines
vim.opt.linebreak = true -- fix where line is wraped
vim.opt.cursorline = true
vim.opt.colorcolumn = { 80 }

-- indents + tabs
local tabwidth = 2
vim.opt.expandtab = true
vim.opt.smarttab = true
vim.opt.cindent = true
vim.opt.autoindent = true
vim.opt.tabstop = tabwidth
vim.opt.shiftwidth = tabwidth
vim.opt.softtabstop = tabwidth

-- Schedule the setting after `UiEnter` because it can increase startup-time.
-- (yoinked from kickstart.nvim)
vim.schedule(function()
  vim.opt.clipboard = "unnamedplus" -- system clipboard
end)

vim.opt.updatetime = 200

-- file saving
vim.opt.swapfile = false
vim.opt.undofile = true
vim.opt.confirm = true

-- searching
vim.opt.ignorecase = true
vim.opt.smartcase = true
vim.opt.wrapscan = true
vim.opt.showmatch = true
vim.opt.incsearch = true

-- wild menus
vim.opt.wildoptions = "pum"
vim.opt.pumblend = 3
vim.opt.pumheight = 20

vim.opt.wildignorecase = true
vim.opt.wildignore = "*.o"

-- netrw
vim.g.netrw_banner = 0
vim.g.netrw_winsize = 30
vim.g.netrw_liststyle = 1
vim.g.netrw_sizestyle = "H"
vim.g.netrw_hide = 1

-- border (this doesn't actually do anything within vim, I"m just setting it
-- here so it"s easy to find)
vim.g.border_style = "solid"

do -- folding
  auto("FileType", {
    callback = function()
      -- use treesitter for folding
      if require("nvim-treesitter.parsers").has_parser() then
        vim.opt.foldmethod = "expr"
        vim.opt.foldexpr = "nvim_treesitter#foldexpr()"
      else
        vim.opt.foldmethod = "syntax"
      end
    end
  })

  vim.opt.foldlevelstart = 99
  vim.opt.foldlevel = 99
  vim.opt.foldenable = true
  vim.o.fillchars = "fold: "

  _G.Fold_text = require("core.folding")
  vim.opt.foldtext = "v:lua.Fold_text()"
end

do -- statusline
  local last_bufnr, i = 1, 1
  --- status line
  ---@return string out formatted status line
  function _G.Status()
    --- get the percentage through the file
    ---@return string out the formatted percentage
    local function percentage()
      local percent, line, lines

      -- get the current and total # of lines
      line = vim.api.nvim_win_get_cursor(0)[1]
      lines = vim.api.nvim_buf_line_count(0)

      -- calculate the percentage through the file
      percent = math.floor((line / lines) * 100)
      if percent == 0 or line == 1 then
        return "Top"
      elseif percent == 100 or line == lines then
        return "Bot"
      end

      return percent.."%%"
    end

    --- get the number of lsp servers
    ---@return string out the formatted number of servers
    local function lsp_servers()
      local out, nclients, hi
      local hi_groups = { "@boolean", "@constant", "@keyword", "@number" }

      -- get the number of clients
      nclients = #vim.lsp.get_clients({ bufnr = 0 })

      -- set the client display
      out = "λ"..nclients
      if nclients > 0 then
        local bufnr = vim.api.nvim_win_get_buf(0)
        if bufnr ~= last_bufnr then
          last_bufnr = bufnr
          i = i + 1
          if i > #hi_groups then
            i = 1
          end
        end

        hi = "%#"..hi_groups[i].."#"
        out = hi..out.."%#StatusLine#"
      end

      return out
    end

    return table.concat {
      "%t", -- file name
      " %h", -- help buffer tag
      "%m", -- modify tag
      "%r", -- readonly flag
      "%=", -- seperate left and right side

      -- print out the number of lsp clients attached with nice colors :)
      lsp_servers(), " ",

      "%<", -- we can start truncating here (I want to keep the file name)
      "%l,%c%V", -- line, column-virtual column
      "%<", -- we can start truncating here
      "        "..percentage() -- percentage through the buffer
    }
  end
  vim.opt.statusline="%!v:lua.Status()"
  vim.opt.laststatus = 3
end