-- Set up nvim-cmp: https://github.com/hrsh7th/nvim-cmp/
local cmp = require('cmp')

local has_words_before = function()
  local line, col = unpack(vim.api.nvim_win_get_cursor(0))
  return col ~= 0 and vim.api.nvim_buf_get_lines(0, line - 1, line, true)[1]:sub(col, col):match("%s") == nil
end

cmp.setup({
  snippet = {
    -- REQUIRED - you must specify a snippet engine
    expand = function(args)
      -- vim.fn["vsnip#anonymous"](args.body) -- For `vsnip` users.
      require('luasnip').lsp_expand(args.body) -- For `luasnip` users.
    end,
  },
  window = {
    completion = cmp.config.window.bordered(),
    documentation = cmp.config.window.bordered(),
  },
  mapping = cmp.mapping.preset.insert({
    ['<C-b>'] = cmp.mapping.scroll_docs(-4),
    ['<C-f>'] = cmp.mapping.scroll_docs(4),
    -- ['<C-Space>'] = cmp.mapping.complete(),
    ['<C-c>'] = cmp.mapping.abort(),
    -- Accept currently selected item.
    -- Set `select` to `false` to only confirm explicitly selected items.
    ['<CR>'] = cmp.mapping.confirm({ select = true }),
    ["<Tab>"] = cmp.mapping(function(fallback)
      if cmp.visible() then
        cmp.select_next_item()
      elseif has_words_before() then
        cmp.complete()
      else
        fallback() -- The fallback function sends a already mapped key. In this case, it's probably `<Tab>`.
      end
    end, { "i", "s" }),
    ["<S-Tab>"] = cmp.mapping(function()
      if cmp.visible() then
        cmp.select_prev_item()
      end
    end, { "i", "s" }),
  }),
  sources = cmp.config.sources({
        { name = 'nvim_lsp' },
    }, {
        { name = 'buffer' },
        { name = 'color_names'},
        { name = 'emoji'},
        { name = 'nvim_lua'},
        { name = 'nerdfont'},
        { name = 'path'},
        { name = 'buffer'},
    })
})

-- Set configuration for specific filetype.
-- cmp.setup.filetype('gitcommit', {
--   sources = cmp.config.sources({
--     -- You can specify the `cmp_git` source if you were installed it.
--     { name = 'cmp_git' },
--   }, {
--     { name = 'buffer' },
--   })
-- })

-- Use buffer source for `/` and `?` (if you enabled `native_menu`, this won't work anymore).
cmp.setup.cmdline({ '/', '?' }, {
  mapping = cmp.mapping.preset.cmdline(),
  sources = {
    { name = 'buffer' }
  }
})

-- Use cmdline & path source for ':' (if you enabled `native_menu`, this won't work anymore).
cmp.setup.cmdline(':', {
  mapping = cmp.mapping.preset.cmdline(),
  sources = cmp.config.sources({
    { name = 'path' }
  }, {
    { name = 'cmdline' }
  })
})

-- Set up lspconfig.
-- local capabilities = require('cmp_nvim_lsp').default_capabilities()

-- require('lspconfig').jedi_language_server.setup {
--     capabilities = capabilities
-- }
