-- LSP Config

local lsp = {}

local on_attach = function(_, bufnr)
	local function buf_set_keymap(...) vim.api.nvim_buf_set_keymap(bufnr, ...) end
	local function buf_set_option(...) vim.api.nvim_buf_set_option(bufnr, ...) end

	-- Enable completion triggered by <c-x><c-o>
	buf_set_option('omnifunc', 'v:lua.vim.lsp.omnifunc')

	local opts = { noremap=true, silent=true }

	buf_set_keymap('n', 'gD', '<cmd>lua vim.lsp.buf.declaration()<CR>', opts)
	buf_set_keymap('n', 'gd', '<cmd>lua vim.lsp.buf.definition()<CR>', opts)
	buf_set_keymap('n', 'K', '<cmd>lua vim.lsp.buf.hover()<CR>', opts)
	buf_set_keymap('n', 'gi', '<cmd>lua vim.lsp.buf.implementation()<CR>', opts)
	buf_set_keymap('n', '<C-k>', '<cmd>lua vim.lsp.buf.signature_help()<CR>', opts)
	buf_set_keymap('n', '<leader>wa', '<cmd>lua vim.lsp.buf.add_workleader_folder()<CR>', opts)
	buf_set_keymap('n', '<leader>wr', '<cmd>lua vim.lsp.buf.remove_workleader_folder()<CR>', opts)
	buf_set_keymap('n', '<leader>wl', '<cmd>lua print(vim.inspect(vim.lsp.buf.list_workleader_folders()))<CR>', opts)
	buf_set_keymap('n', '<leader>D', '<cmd>lua vim.lsp.buf.type_definition()<CR>', opts)
	buf_set_keymap('n', '<leader>rn', '<cmd>lua vim.lsp.buf.rename()<CR>', opts)
	buf_set_keymap('n', '<leader>ca', '<cmd>lua vim.lsp.buf.code_action()<CR>', opts)
	buf_set_keymap('n', 'gr', '<cmd>lua vim.lsp.buf.references()<CR>', opts)
	buf_set_keymap('n', '<leader>e', '<cmd>lua vim.lsp.diagnostic.show_line_diagnostics()<CR>', opts)
	buf_set_keymap('n', '[d', '<cmd>lua vim.lsp.diagnostic.goto_prev()<CR>', opts)
	buf_set_keymap('n', ']d', '<cmd>lua vim.lsp.diagnostic.goto_next()<CR>', opts)
	buf_set_keymap('n', '<leader>q', '<cmd>lua vim.lsp.diagnostic.set_loclist()<CR>', opts)
	buf_set_keymap('n', '<leader>f', '<cmd>lua vim.lsp.buf.formatting()<CR>', opts)
end

function lsp.init()
	local lsp_installer = require'nvim-lsp-installer'

	lsp_installer.on_server_ready(function(server)
		local opts = {}
		if server.name == 'sumneko_lua' then
			opts.settings = {
				Lua = {
					diagnostics = {
						globals = { 'vim' }
					}
				}
			}
		end
		opts.on_attach = on_attach
		opts.flags = {
		  debounce_text_changes = 150,
		}
		server:setup(opts)
	end)
end

return lsp