local M = {
    on_attach = function(client, bufnr)
        local function buf_set_keymap(...) vim.api.nvim_buf_set_keymap(bufnr, ...) end

        require "lsp_signature".on_attach()
        -- require'completion'.on_attach()

        -- Mappings.
        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('i', '<C-k>', '<cmd>lua vim.lsp.buf.signature_help()<CR>', opts)
        buf_set_keymap('n', '<space>wa', '<cmd>lua vim.lsp.buf.add_workspace_folder()<CR>', opts)
        buf_set_keymap('n', '<space>wr', '<cmd>lua vim.lsp.buf.remove_workspace_folder()<CR>', opts)
        buf_set_keymap('n', '<space>wl', '<cmd>lua print(vim.inspect(vim.lsp.buf.list_workspace_folders()))<CR>', opts)
        buf_set_keymap('n', '<space>D', '<cmd>lua vim.lsp.buf.type_definition()<CR>', opts)
        buf_set_keymap('n', '<space>rn', '<cmd>lua vim.lsp.buf.rename()<CR>', opts)
        buf_set_keymap('n', '<space>ca', '<cmd>lua vim.lsp.buf.code_action()<CR>', opts)
        buf_set_keymap('v', '<space>ca', '<cmd>lua vim.lsp.buf.range_code_action()<CR>', opts)
        buf_set_keymap('n', 'gr', '<cmd>lua vim.lsp.buf.references()<CR>', opts)
        buf_set_keymap('n', '[d', '<cmd>lua vim.diagnostic.goto_prev()<CR>', opts)
        buf_set_keymap('n', ']d', '<cmd>lua vim.diagnostic.goto_next()<CR>', opts)
        buf_set_keymap('n', '<space>q', '<cmd>lua vim.diagnostic.setloclist()<CR>', opts)
        buf_set_keymap('n', '<space>F', '<cmd>lua vim.lsp.buf.formatting()<CR>', opts)
        buf_set_keymap('v', '<space>F', '<cmd>lua vim.lsp.buf.range_formatting()<CR>', opts)
    end
}

function M.setup()
    require("lua-dev").setup({})

    local nvim_lsp = require('lspconfig')

    -- Use a loop to conveniently both setup defined servers
    -- and map buffer local keybindings when the language server attaches
    local servers = { 'phpactor', 'gopls', 'clangd', 'zls', 'hls', 'tsserver', 'sumneko_lua', 'perlls' }
    for _, lsp in ipairs(servers) do
        nvim_lsp[lsp].setup {
            on_attach = M.on_attach,
            capabilities = require('cmp_nvim_lsp').update_capabilities(vim.lsp.protocol.make_client_capabilities()),
        }
    end

    require 'lspconfig'.phpactor.setup {
        on_attach = M.on_attach,
        capabilities = require('cmp_nvim_lsp').update_capabilities(vim.lsp.protocol.make_client_capabilities()),

        root_dir = function(startpath)
            local u = require('lspconfig.util')
            return u.search_ancestors(startpath, function(path)
                return not string.find(path, '/vendor/') and (
                    u.path.exists(u.path.join(path, 'composer.json'))
                    or u.path.exists(u.path.join(path, '.git'))
                )
            end)
        end
    }

    require 'lspconfig'.omnisharp.setup {
        cmd = { '/usr/bin/omnisharp', '--languageserver', '--hostPID', tostring(pid) },
        on_attach = M.on_attach,
        capabilities = require('cmp_nvim_lsp').update_capabilities(vim.lsp.protocol.make_client_capabilities())
    }

    require 'lspconfig'.powershell_es.setup {
        bundle_path = '/home/vladimir/devel/PowerShellEditorServices/module',
        capabilities = require('cmp_nvim_lsp').update_capabilities(vim.lsp.protocol.make_client_capabilities())
    }
end

return M