-- vim: ft=lua

local map = vim.api.nvim_set_keymap

-- Compe setup
require('compe').setup {
  enabled = true;
  autocomplete = true;
  debug = false;
  min_length = 1;
  preselect = 'enable';
  throttle_time = 80;
  source_timeout = 200;
  incomplete_delay = 400;
  max_abbr_width = 100;
  max_kind_width = 100;
  max_menu_width = 100;
  documentation = true;

  source = {
    path = true;
    buffer = true;
    calc = true;
    vsnip = true;
    nvim_lsp = true;
    nvim_lua = true;
    spell = true;
    treesitter = true;
  };
}

local t = function(str)
  return vim.api.nvim_replace_termcodes(str, true, true, true)
end

local check_back_space = function()
    local col = vim.fn.col('.') - 1
    if col == 0 or vim.fn.getline('.'):sub(col, col):match('%s') then
        return true
    else
        return false
    end
end

-- Use (s-)tab to:
--- move to prev/next item in completion menuone
--- jump to prev/next snippet's placeholder
_G.tab_complete = function()
  if vim.fn.pumvisible() == 1 then
    return t "<C-n>"
  elseif check_back_space() then
    return t "<Tab>"
  else
    return vim.fn['compe#complete']()
  end
end
_G.s_tab_complete = function()
  if vim.fn.pumvisible() == 1 then
    return t "<C-p>"
  else
    return t "<S-Tab>"
  end
end

map("i", "<Tab>", "v:lua.tab_complete()", {expr = true})
map("s", "<Tab>", "v:lua.tab_complete()", {expr = true})
map("i", "<S-Tab>", "v:lua.s_tab_complete()", {expr = true})
map("s", "<S-Tab>", "v:lua.s_tab_complete()", {expr = true})

vim.o.completeopt = 'menuone,noselect'

map('i', '<C-Space>', 'compe#complete()', {expr = true, silent = true, noremap = true})
map('i', '<CR>', "compe#confirm('<CR>')", {expr = true, silent = true, noremap = true})
map('i', '<C-e>', "compe#close()", {expr = true, silent = true, noremap = true})
map('i', '<C-t>', "compe#scroll({'delta': +4})", {expr = true, silent = true, noremap = true})
map('i', '<C-s>', "compe#scroll({'delta': -4})", {expr = true, silent = true, noremap = true})