local function config()
	local ls = require("luasnip")
	local capture = require("utils.capture")
	local s = ls.snippet
	local sn = ls.snippet_node
	local fmt = require("luasnip.extras.fmt").fmt
	local t = ls.text_node
	local i = ls.insert_node
	local f = ls.function_node
	local c = ls.choice_node
	local d = ls.dynamic_node

	local function getCurrentYear()
		return os.date("%Y")
	end

	local function getGitUsername()
		local stdout = capture("git config user.name")
		if stdout == "" then
			return nil
		end
		return stdout
	end

	ls.config.set_config {
		history = true,
		updateevents = "TextChanged,TextChangedI",
		enable_autosnippets = true
	}

	vim.keymap.set({"i", "s"}, "<c-k>", function()
		if ls.expand_or_jumpable() then
			ls.expand_or_jump()
		end
	end, { silent = true })

	vim.keymap.set({ "i", "s" }, "<c-j>", function()
		if ls.jumpable(-1) then
			ls.jump(-1)
		end
	end, { silent = -1 })

	vim.keymap.set({"i"}, "<c-l>", function()
		if ls.choice_active() then
			ls.change_choice(1)
		end
	end)

	ls.add_snippets("all", {
		s("MIT", {
			t({"The MIT License (MIT)", "Copyright © "}),
			f(getCurrentYear, {}),
			t(" "),
			d(1, function()
				return sn(nil, {
					i(1, getGitUsername() or "<copyright holders>")
				})
			end, {}),
			t{
				"",
				"",
				"Permission is hereby granted, free of charge, to any person obtaining a copy of",
				"this software and associated documentation files (the “Software”), to deal in",
				"the Software without restriction, including without limitation the rights to",
				"use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies",
				"of the Software, and to permit persons to whom the Software is furnished to do",
				"so, subject to the following conditions:",
				"",
				"The above copyright notice and this permission notice shall be included in all",
				"copies or substantial portions of the Software.",
				"",
				"THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR",
				"IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,",
				"FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE",
				"AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER",
				"LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,",
				"OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE",
				"SOFTWARE.",
			}
		})
	})

	ls.add_snippets("lua", {
		s("req",
			fmt([[local {} = require("{}")]], {
				f(function(module_name)
					local parts = vim.split(module_name[1][1], ".", true)
					return (parts[#parts] or ""):gsub("-", "_")
				end, { 1 }),
				i(1)
			})
		)
	})
end

return {
	'L3MON4D3/LuaSnip',
	config = config
}