local M = {}

local cmp_nvim_lsp = require 'cmp_nvim_lsp'

M.capabilities = vim.lsp.protocol.make_client_capabilities()
M.capabilities.textDocument.completion.completionItem.snippetSupport = true
-- M.capabilities.offsetEncoding = { "utf-16" }
M.capabilities = cmp_nvim_lsp.default_capabilities(M.capabilities)

-- vim.cmd [[autocmd CursorHold,CursorHoldI * lua vim.diagnostic.open_float(nil, {focus=false, scope="cursor"})]]

M.setup = function()
	local config = {
		virtual_text = true,
		signs = false,
		underline = true,
		update_in_insert = true,
		severity_sort = true,
		float = {
			focusable = true,
			style = 'minimal',
			border = 'rounded',
			source = 'always',
			header = '',
			prefix = '',
		},
	}
	vim.diagnostic.config(config)

	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',
	})

	--[[ local on_references = vim.lsp.handlers['textDocument/references'] ]]
	--[[ vim.lsp.handlers['textDocument/references'] = vim.lsp.with(on_references, { ]]
	--[[ 	-- Use location list instead of quickfix list ]]
	--[[ 	loclist = true, ]]
	--[[ }) ]]
end

local function lsp_keymaps(bufnr)
	local opts = { noremap = true, silent = true }
	local keymap = vim.api.nvim_buf_set_keymap
	keymap(bufnr, 'n', 'gD', '<cmd>lua vim.lsp.buf.declaration()<CR>', opts)
	keymap(bufnr, 'n', 'gd', '<cmd>lua vim.lsp.buf.definition()<CR>', opts)
	keymap(bufnr, 'n', 'K', '<cmd>lua vim.lsp.buf.hover()<CR>', opts)
	keymap(bufnr, 'n', 'gI', '<cmd>lua vim.lsp.buf.implementation()<CR>', opts)
	keymap(bufnr, 'n', 'gr', '<cmd>lua vim.lsp.buf.references()<CR>', opts)
	keymap(bufnr, 'n', 'gl', '<cmd>lua vim.diagnostic.open_float()<CR>', opts)
	keymap(bufnr, 'n', '<leader>lf', '<cmd>lua vim.lsp.buf.format { async = true }<cr>', opts)
	keymap(bufnr, 'n', '<leader>li', '<cmd>LspInfo<cr>', opts)
	keymap(bufnr, 'n', '<leader>lI', '<cmd>LspInstallInfo<cr>', opts)
	keymap(bufnr, 'n', '<leader>la', '<cmd>lua vim.lsp.buf.code_action()<cr>', opts)
	keymap(bufnr, 'n', '<leader>lj', '<cmd>lua vim.diagnostic.goto_next({buffer=0})<cr>', opts)
	keymap(bufnr, 'n', '<leader>lk', '<cmd>lua vim.diagnostic.goto_prev({buffer=0})<cr>', opts)
	keymap(bufnr, 'n', '<leader>lr', '<cmd>lua vim.lsp.buf.rename()<cr>', opts)
	keymap(bufnr, 'n', '<leader>ls', '<cmd>lua vim.lsp.buf.signature_help()<CR>', opts)
	keymap(bufnr, 'n', '<leader>lq', '<cmd>lua vim.diagnostic.setloclist()<CR>', opts)
	keymap(bufnr, 'n', '<leader>e', '<cmd>lua vim.diagnostic.open_float()<CR>', opts)
end

M.on_attach = function(client, bufnr)
	--[[ vim.api.nvim_buf_set_option(bufnr, 'omnifunc', 'v:lua.vim.lsp.omnifunc') ]]
	lsp_keymaps(bufnr)
	if client.name == 'sumneko_lua' then
		client.server_capabilities.documentFormattingProvider = false
	end
	if client.name == 'clangd' then
		client.server_capabilities.documentFormattingProvider = false
	end
	if client.name == 'gopls' then
		client.server_capabilities.documentFormattingProvider = false
	end
	if client.name == 'jdtls' then
		client.server_capabilities.documentFormattingProvider = false
	end
	if client.name == 'jdt.ls' then
		client.server_capabilities.documentFormattingProvider = false
		vim.lsp.codelens.refresh()
		if JAVA_DAP_ACTIVE then
			require('jdtls').setup_dap { hotcodereplace = 'auto' }
			require('jdtls.dap').setup_dap_main_class_configs()
		end
	end
	local ft = vim.api.nvim_buf_get_option(bufnr, 'filetype')
	local nls = require 'config.plugins.null-ls'

	local enable = false
	if nls.has_formatter(ft) then
		enable = client.name == 'null-ls'
	else
		enable = not (client.name == 'null-ls')
	end

	if client.name == 'tsserver' then
		enable = false
	end
	-- util.info(client.name .. " " .. (enable and "yes" or "no"), "format")
	client.server_capabilities.documentFormattingProvider = enable
end

return M