local M = {}

M.capabilities = vim.lsp.protocol.make_client_capabilities()

local status_cmp_ok, cmp_nvim_lsp = pcall(require, "cmp_nvim_lsp")
if not status_cmp_ok then
	print("cmp_nvim_lsp error!")
	return
end

M.capabilities.textDocument.completion.completionItem.snippetSupport = true
M.capabilities = cmp_nvim_lsp.default_capabilities(M.capabilities)

M.setup = function()
	local icons = require("chris.icons")
	local signs = {
		{ name = "DiagnosticSignError", text = icons.diagnostics.Error },
		{ name = "DiagnosticSignWarn", text = icons.diagnostics.Warning },
		{ name = "DiagnosticSignHint", text = icons.diagnostics.Hint },
		{ name = "DiagnosticSignInfo", text = icons.diagnostics.Information },
	}

	for _, sign in ipairs(signs) do
		vim.fn.sign_define(sign.name, {
			texthl = sign.name,
			text = sign.text,
			numhl = "",
		})
	end

	local config = {
		-- disable virtual text
		virtual_lines = false,
		virtual_text = false,
		-- show signs
		signs = {
			active = signs,
		},
		update_in_insert = true,
		underline = true,
		severity_sort = true,
		float = {
			focusable = true,
			style = "minimal",
			source = "if_many", -- Or "always"
		},
	}

	vim.diagnostic.config(config)
end

local function attach_navic(client, bufnr)
	vim.g.navic_silence = false
	local status_ok, navic = pcall(require, "nvim-navic")
	if not status_ok then
		print("nvim-navic error!")
		return
	end
	if client.server_capabilities.documentSymbolProvider then
		navic.attach(client, bufnr)
	end
end

local function disable_deno_formatting(client)
	if client.name == "denols" then
		require("null-ls").disable({ "prettier" })
	end
end

local function resolve_tsserver_deno(client)
	local active_clients = vim.lsp.get_active_clients()
	if client.name == "denols" then
		for _, client_ in pairs(active_clients) do
			-- stop tsserver if denols is already active
			if client_.name == "tsserver" then
				client_.stop()
			end
		end
	elseif client.name == "tsserver" then
		for _, client_ in pairs(active_clients) do
			-- prevent tsserver from starting if denols is already active
			if client_.name == "denols" then
				client.stop()
			end
		end
	end
end

M.on_attach = function(client, bufnr)
	attach_navic(client, bufnr)
	disable_deno_formatting(client)
	resolve_tsserver_deno(client)
end

function M.enable_format_on_save()
	vim.cmd([[
    augroup format_on_save
      autocmd!
      autocmd BufWritePre * lua vim.lsp.buf.format({ async = false })
    augroup end
  ]])
	vim.notify("Enabled format on save")
end

function M.disable_format_on_save()
	M.remove_augroup("format_on_save")
	vim.notify("Disabled format on save")
end

function M.toggle_format_on_save()
	if vim.fn.exists("#format_on_save#BufWritePre") == 0 then
		M.enable_format_on_save()
	else
		M.disable_format_on_save()
	end
end

function M.remove_augroup(name)
	if vim.fn.exists("#" .. name) == 1 then
		vim.cmd("au! " .. name)
	end
end

vim.cmd([[ command! LspToggleAutoFormat execute 'lua require("chris.lsp.handlers").toggle_format_on_save()' ]])

return M