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 cmp = require("cmp")

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.
			-- require('snippy').expand_snippet(args.body) -- For `snippy` users.
			-- vim.fn["UltiSnips#Anon"](args.body) -- For `ultisnips` users.
		end,
	},
	window = {
		-- completion = cmp.config.window.bordered(),
		-- documentation = cmp.config.window.bordered(),
	},
	mapping = cmp.mapping.preset.insert({
		["<C-Space>"] = cmp.mapping.confirm({
			behavior = cmp.ConfirmBehavior.Insert,
			select = true,
		}),

		["<Tab>"] = function(fallback)
			if not cmp.select_next_item() then
				if vim.bo.buftype ~= "prompt" and has_words_before() then
					cmp.complete()
				else
					fallback()
				end
			end
		end,

		["<S-Tab>"] = function(fallback)
			if not cmp.select_prev_item() then
				if vim.bo.buftype ~= "prompt" and has_words_before() then
					cmp.complete()
				else
					fallback()
				end
			end
		end,
	}),
	sources = cmp.config.sources({
		{ name = "nvim_lsp" },
		{ name = "vsnip" }, -- For vsnip users.
		-- { name = 'luasnip' }, -- For luasnip users.
		-- { name = 'ultisnips' }, -- For ultisnips users.
		-- { name = 'snippy' }, -- For snippy users.
	}, {
		{ name = "buffer" },
	}),
})

-- Set configuration for specific filetype.
cmp.setup.filetype("gitcommit", {
	sources = cmp.config.sources({
		{ name = "cmp_git" }, -- You can specify the `cmp_git` source if you were installed it.
	}, {
		{ 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()
-- Replace <YOUR_LSP_SERVER> with each lsp server you've enabled.
require("lspconfig")["pyright"].setup({
	capabilities = capabilities,
})