-- Configure Completion
vim.opt.completeopt = {"menu","menuone","noselect"}
vim.opt.shortmess:append "c"

local ok, lspkind = pcall(require, "lspkind")
if not ok then
	print("lspkind is not installed.")
	return
end

lspkind.init()

local luasnip = require("luasnip")
local status, cmp = pcall(require, "cmp")
if not status then
	print("nvim-cmp is not installed.")
	return
end

if cmp == nil then
	return
end

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 {
	enabled = function ()
		-- disable complete in comments
		local context = require'cmp.config.context'
		-- keep command mode completion enabled when cursor is in a comment
		if vim.api.nvim_get_mode().mode == 'c' then
			return true
		else
			return not context.in_treesitter_capture("comment")
				and not context.in_syntax_group("Comment")
		end
	end,
	mapping = {
		["<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" }),
		["<C-b>"] = cmp.mapping.scroll_docs(-4),
		["<C-f>"] = cmp.mapping.scroll_docs(4),
		['<C-Space>'] = cmp.mapping.complete {
			behavior = cmp.ConfirmBehavior.Insert,
			select = true,
		},
		['<C-e>'] = cmp.mapping.abort(),
		["<CR>"] = cmp.mapping(
		cmp.mapping.confirm {
			behavior = cmp.ConfirmBehavior.Insert,
			select = true,
		}),

	},
	sources = {
		{name = "nvim_lua"},
		{name = "nvim_lsp"},
		{name = "path"},
		{name = "luasnip"},
		{
			name = "buffer",
			option = {
				keyword_length = 5,
			},
		},
	},
	snippet = {
		expand = function(args)
			require("luasnip").lsp_expand(args.body)
		end,
	},
---	experimental = {
---		native_menu = false,
---		ghost_text = true,
---	},
	formatting = {
		format = lspkind.cmp_format {
			mode = 'symbol_text',
			menu = {
			buffer = "[BUF]",
			nvim_lsp = "[LSP]",
			nvim_lua = "[API]",
			path = "[PTH]",
			luasnip = "[SNP]"
			}
		}
	}
}