-- Configuration for nvim-compe

local utils = require('utils')

vim.cmd [[set shortmess+=c]]
utils.opt('o', 'completeopt', 'menuone,noselect')

require'compe'.setup {
    enabled = true;
    autocomplete = true;
    debug = false;
    min_length = 1;
    preselect = 'enable';
    throttle_time = 80;
    source_timeout = 200;
    incomplete_delay = 400;
    allow_prefix_unmatch = false;
    max_abbr_width = 1000;
    max_kind_width = 1000;
    max_menu_width = 1000000;
    documentation = true;


    source = {
        path = true;
        buffer = true;
        calc = false;
        vsnip = true;
        nvim_lsp = true;
        nvim_lua = false;
        spell = true;
        tags = true;
        snippets_nvim = false;
        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 vim.fn.call("vsnip#available", {1}) == 1 then
    return t "<Plug>(vsnip-expand-or-jump)"
  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>"
  elseif vim.fn.call("vsnip#jumpable", {-1}) == 1 then
    return t "<Plug>(vsnip-jump-prev)"
  else
    return t "<S-Tab>"
  end
end

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