-- import nvim-cmp plugin safely
local cmp_status, cmp = pcall(require, "cmp")
if not cmp_status then
	return
end

-- import luasnip plugin safely
local luasnip_status, luasnip = pcall(require, "luasnip")
if not luasnip_status then
	return
end

-- import lspkind plugin safely
local lspkind_status, lspkind = pcall(require, "lspkind")
if not lspkind_status then
	return
end

-- load vs-code like snippets from plugins (e.g. friendly-snippets)
require("luasnip/loaders/from_vscode").lazy_load()

local function has_words_before()
	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

vim.opt.completeopt = "menu,menuone,noselect"

cmp.setup({
	snippet = {
		expand = function(args)
			luasnip.lsp_expand(args.body)
		end,
	},

	window = {
		completion = cmp.config.window.bordered(),
		documentation = cmp.config.window.bordered(),
	},

	mapping = cmp.mapping.preset.insert({
		["<C-k>"] = 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-j>"] = 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" }),

		["<C-b>"] = cmp.mapping.scroll_docs(-4),
		["<C-f>"] = cmp.mapping.scroll_docs(4),
		["<C-Space>"] = cmp.mapping.complete(),
		["<C-e>"] = cmp.mapping.abort(),
		["<CR>"] = cmp.mapping.confirm({ select = true }),
	}),
	-- sources for autocompletion
	sources = cmp.config.sources({
		{ name = "nvim_lsp" },              -- lsp
		{ name = "luasnip" },               -- snippets
		{ name = "buffer",  keyword_length = 5 }, -- text within current buffer
		{ name = "path" },                  -- file system paths
	}),
	-- configure lspkind for vs-code like icons
	formatting = {
		format = lspkind.cmp_format({
			maxwidth = 150,
			ellipsis_char = "...",
			menu = {
				buffer = "[buf]",
				luasnip = "[lua]",
				nvim_lsp = "[LSP]",
				path = "[path]",
				gh_issues = "[issues]",
			},
		}),
	},

	experimental = {
		ghost_text = true,
	},
})