local ok, lsp = pcall(require, 'lsp-zero')
if not ok then
    return
end

lsp.preset("recommended")

-- Fix Undefined global 'vim'
lsp.configure('sumneko_lua', {
    settings = {
        Lua = {
            diagnostics = {
                globals = { 'vim' }
            }
        }
    }
})

local has_words_before = function()
  unpack = unpack or table.unpack
  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

local luasnip = require("luasnip")
local cmp = require('cmp')
local cmp_select = {behavior = cmp.SelectBehavior.Select}
local cmp_mappings = lsp.defaults.cmp_mappings({
    ['<C-p>'] = cmp.mapping.select_prev_item(cmp_select),
    ['<C-n>'] = cmp.mapping.select_next_item(cmp_select),
    ['<CR>'] = cmp.mapping.confirm({ select = true }),
    ["<C-e>"] = cmp.mapping.abort(),
    ["<C-Space>"] = 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" }),
    ["<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" }),
})

local lspkind = require('lspkind')
local cmp_formatting = {
    format = lspkind.cmp_format({
        mode = 'symbol_text', -- show only symbol annotations
        maxwidth = 50, -- prevent the popup from showing more than provided characters (e.g 50 will not show more than 50 characters)
    })
}

lsp.setup_nvim_cmp({
    mapping = cmp_mappings,
    formatting = cmp_formatting
})

lsp.on_attach(function(client, bufnr)
	local bufmap = function(mode, lhs, rhs)
		local opts = {buffer = true, remap = false}
		vim.keymap.set(mode, lhs, rhs, opts)
	end

	-- List diagnostics in Telescope
	bufmap('n', 'gA', '<cmd>Telescope diagnostics<cr>')

	-- Lists all the references
	bufmap('n', 'gr', '<cmd>Telescope lsp_references<cr>')
end)


local on_attach_format = function(client)
    require("lsp-format").on_attach(client)
end

lsp.configure('clangd', {
  on_attach = on_attach_format
})

lsp.nvim_workspace()
lsp.setup()

vim.diagnostic.config({
    virtual_text = false,
    severity_sort = true,
    float = {
        border = 'rounded',
        source = 'always',
        header = '',
        prefix = '',
    },
})