-- luasnip setup
local luasnip = require "luasnip"
local lspkind = require "lspkind"
local cmp = require "cmp"
local cmp_autopairs = require('nvim-autopairs.completion.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 {
  formatting = {
    format = lspkind.cmp_format({with_text = true, menu = ({
      buffer = "[Buffer]",
      nvim_lsp = "[LSP]",
      luasnip = "[LuaSnip]",
      nvim_lua = "[Lua]",
      latex_symbols = "[Latex]",
    })}),
  },
  experimental = {
    ghost_text = true,
  },
  completion = {
    completeopt = "menu,menuone",
  },
  snippet = {
    expand = function(args)
      luasnip.lsp_expand(args.body)
    end
  },
  mapping = {
    ['<C-Leader>'] = cmp.mapping.complete(),
    ["<Tab>"] = cmp.mapping(function(fallback)
      if cmp.visible() then
        cmp.select_next_item()
      elseif luasnip.expand_or_jumpable() then
        luasnip.expand_or_jump()
      elseif has_words_before() then
        cmp.complete()
      else
        fallback()
      end
    end, { "i", "s" }),

    ['<CR>'] = cmp.mapping.confirm({
        behavior = cmp.ConfirmBehavior.Replace,
        select = true,
    }),

    ["<S-Tab>"] = cmp.mapping(function(fallback)
      if cmp.visible() then
        cmp.select_prev_item()
      elseif luasnip.jumpable(-1) then
        luasnip.jump(-1)
      else
        fallback()
      end
    end, { "i", "s" }),
  },
  sources = {
    {name = "nvim_lsp"},
    {name = "luasnip"},
		{name = "path"},
    {name = "buffer"},
    {name = "calc"}
  }
}

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

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


-- The nvim-cmp almost supports LSP's capabilities so You should advertise it to LSP servers..
-- Setup lspconfig.
local capabilities = require('cmp_nvim_lsp').update_capabilities(vim.lsp.protocol.make_client_capabilities())
require'lspconfig'.html.setup {
  capabilities = capabilities
}

cmp.event:on('confirm_done', cmp_autopairs.on_confirm_done({ map_char = { tex = '' } }))