local cmprg = false
local cmpcalc = false
local cmptag = false
local lspghost_text = false
local data_exists, custom_cmp = pcall(require, "core.config")
if data_exists then
	cmprg = custom_cmp.cmprg
	cmpcalc = custom_cmp.cmpcalc
	cmptag = custom_cmp.cmptag
	lspghost_text = custom_cmp.lspghost_text
end
return {
	"hrsh7th/nvim-cmp",
	version = false, -- last release is way too old
	event = "InsertEnter",
	dependencies = {
		"hrsh7th/cmp-nvim-lsp",
		"hrsh7th/cmp-buffer",
		"hrsh7th/cmp-path",
		"saadparwaiz1/cmp_luasnip",
		"hrsh7th/cmp-nvim-lua",
		{ "lukas-reineke/cmp-rg", enabled = cmprg }, -- experimental
		{ "hrsh7th/cmp-calc", enabled = cmpcalc }, -- experimental
		{ "quangnguyen30192/cmp-nvim-tags", enabled = cmptag }, -- experimental
	},
	opts = function()
		local cmp = require("cmp")
		local luasnip = require("luasnip")

		local check_backspace = function()
			local col = vim.fn.col(".") - 1
			return col == 0 or vim.fn.getline("."):sub(col, col):match("%s")
		end

		return {
			completion = {
				completeopt = "menu,menuone,noinsert",
			},
			snippet = {
				expand = function(args)
					require("luasnip").lsp_expand(args.body)
				end,
			},
			mapping = cmp.mapping.preset.insert({
				["<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 }), -- Accept currently selected item. Set `select` to `false` to only confirm explicitly selected items.
				["<Tab>"] = cmp.mapping(function(fallback)
					if cmp.visible() then
						cmp.select_next_item()
					elseif luasnip.expandable() then
						luasnip.expand()
					elseif luasnip.expand_or_jumpable() then
						luasnip.expand_or_jump()
					elseif check_backspace() then
						fallback()
					else
						fallback()
					end
				end, {
					"i",
					"s",
				}),
			}),
			sources = cmp.config.sources({
				{ name = "nvim_lsp" },
				{ name = "luasnip" },
				{ name = "buffer" },
				{ name = "path" },
				{ name = "nvim_lua" },
				{ name = "rg" }, -- experimental
				{ name = "calc" }, -- experimental
				{ name = "tags" }, --experimental
			}),
			formatting = {
				fields = { "kind", "abbr", "menu" },
				format = function(entry, vim_item)
					vim_item.kind = string.format("%s", require("user.icons")["kind"][vim_item.kind])
					vim_item.menu = ({
						nvim_lsp = "(LSP)",
						luasnip = "(Snippet)",
						buffer = "(Buffer)",
						path = "(Path)",
					})[entry.source.name]
					return vim_item
				end,
			},
			window = {
				completion = cmp.config.window.bordered(),
				documentation = cmp.config.window.bordered(),
			},
			experimental = {
				ghost_text = lspghost_text,
				native_menu = false,
			},
		}
	end,
}