local Lsp = {}

Lsp.setup = function()
	local luasnip = require("luasnip")
	local cmp = require("cmp")

	local has_words_before = function()
		if vim.api.nvim_buf_get_option(0, "buftype") == "prompt" then
			return false
		end
		local line, col = unpack(vim.api.nvim_win_get_cursor(0))
		return col ~= 0 and vim.api.nvim_buf_get_text(0, line - 1, 0, line - 1, col, {})[1]:match("^%s*$") == nil
	end

	cmp.setup({
		snippet = {
			expand = function(args)
				luasnip.lsp_expand(args.body)
			end,
		},
		window = {
			completion = cmp.config.window.bordered(),
			documentation = cmp.config.window.bordered(),
		},
		mapping = {
			["<C-p>"] = function()
				if luasnip.jumpable(-1) then
					luasnip.jump(-1)
				else
					cmp.mapping.select_prev_item()
				end
			end,
			["<C-n>"] = function()
				if luasnip.expand_or_jumpable() then
					luasnip.expand_or_jump()
				else
					cmp.mapping.select_next_item()
				end
			end,
			["<C-d>"] = cmp.mapping.scroll_docs(-4),
			["<C-f>"] = cmp.mapping.scroll_docs(4),
			["<C-Space>"] = cmp.mapping.complete(),
			["<C-e>"] = cmp.mapping.close(),
			["<CR>"] = cmp.mapping.confirm({
				behavior = cmp.ConfirmBehavior.Replace,
				select = true,
			}),
			["<Tab>"] = function(fallback)
				if cmp.visible() and has_words_before() then
					cmp.select_next_item()
				else
					fallback()
				end
			end,
			["<S-Tab>"] = function(fallback)
				if cmp.visible() and has_words_before() then
					cmp.select_prev_item()
				else
					fallback()
				end
			end,
		},
		sources = {
			{ name = "copilot", group_index = 2 },
			{ name = "nvim_lsp", group_index = 2 },
			{ name = "luasnip", group_index = 2 },
		},
	})

	vim.o.completeopt = "menuone,noselect"
	vim.o.updatetime = 250
	vim.cmd([[autocmd CursorHold,CursorHoldI * lua vim.diagnostic.open_float(nil, {focus=false})]])
	vim.lsp.handlers["textDocument/publishDiagnostics"] = vim.lsp.with(vim.lsp.diagnostic.on_publish_diagnostics, {
		virtual_text = {
			source = "if_many",
		},
	})

	vim.lsp.handlers["textDocument/hover"] = vim.lsp.with(vim.lsp.handlers.hover, { border = "rounded" })

	vim.lsp.handlers["textDocument/signatureHelp"] =
		vim.lsp.with(vim.lsp.handlers.signature_help, { border = "rounded" })

	vim.diagnostic.config({
		float = { border = "rounded", zindex = 1 },
	})
end

Lsp.setup()