local lsp = require('lsp-zero')
lsp.preset('recommended')

lsp.ensure_installed({
	'tsserver',
	'eslint',
	'sumneko_lua',
	'gopls',
	'rust_analyzer',
	'clangd',
	'jedi_language_server'
})


-- Fix Undefined global 'vim'
lsp.configure('sumneko_lua', {
    settings = {
        Lua = {
            diagnostics = {
                globals = { 'vim' }
            }
        }
    }
})


local cmp = require'cmp'
local cmp_select = {behavior = cmp.SelectBehavior.Select}

cmp.setup({
        mapping = {
                ["<C-e>"] = cmp.mapping.close(),
                ["<C-p>"] = cmp.mapping.select_prev_item(cmp_select),
                ["<C-n>"] = cmp.mapping.select_next_item(cmp_select),
                ["<C-d>"] = cmp.mapping.scroll_docs(-4),
                ["<C-f>"] = cmp.mapping.scroll_docs(4),
                ["<C-y>"] = cmp.mapping.confirm {
                        select = true,
                },
                ["<C-space>"] = cmp.mapping.complete(),
                ["<Tab>"] = cmp.mapping(cmp.mapping.select_next_item(), { "i", "s" }),
                ["<S-Tab>"] = cmp.mapping(cmp.mapping.select_prev_item(), { "i", "s" }),
        },

        sources = {
                { name = "nvim_lsp" },
                { name = "path" },
                { name = "luasnip" },
                { name = "buffer", keyword_length = 5 },

        },

        snippet = {
                expand = function(args)
                        require('luasnip').lsp_expand(args.body)
                end,
        },

        experimental = {
                native_menu = false
        }
})


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

lsp.on_attach(function(client, bufnr)
	  vim.api.nvim_buf_set_option(bufnr, 'omnifunc', 'v:lua.vim.lsp.omnifunc')

  -- Mappings.
  -- See `:help vim.lsp.*` for documentation on any of the below functions
  vim.api.nvim_buf_set_keymap(bufnr, 'n', 'gD', '<cmd>lua vim.lsp.buf.declaration()<CR>', opts)
  vim.api.nvim_buf_set_keymap(bufnr, 'n', 'gd', '<cmd>lua vim.lsp.buf.definition()<CR>', opts)
  vim.api.nvim_buf_set_keymap(bufnr, 'n', 'K', '<cmd>lua vim.lsp.buf.hover()<CR>', opts)
  vim.api.nvim_buf_set_keymap(bufnr, 'n', 'gi', '<cmd>lua vim.lsp.buf.implementation()<CR>', opts)
  vim.api.nvim_buf_set_keymap(bufnr, 'n', '<C-k>', '<cmd>lua vim.lsp.buf.signature_help()<CR>', opts)
  vim.api.nvim_buf_set_keymap(bufnr, 'n', '<leader>wa', '<cmd>lua vim.lsp.buf.add_workspace_folder()<CR>', opts)
  vim.api.nvim_buf_set_keymap(bufnr, 'n', '<leader>wr', '<cmd>lua vim.lsp.buf.remove_workspace_folder()<CR>', opts)
  vim.api.nvim_buf_set_keymap(bufnr, 'n', '<leader>wl', '<cmd>lua print(vim.inspect(vim.lsp.buf.list_workspace_folders()))<CR>', opts)
  vim.api.nvim_buf_set_keymap(bufnr, 'n', '<leader>D', '<cmd>lua vim.lsp.buf.type_definition()<CR>', opts)
  vim.api.nvim_buf_set_keymap(bufnr, 'n', '<leader>rn', '<cmd>lua vim.lsp.buf.rename()<CR>', opts)
  vim.api.nvim_buf_set_keymap(bufnr, 'n', '<leader>ca', '<cmd>lua vim.lsp.buf.code_action()<CR>', opts)
  vim.api.nvim_buf_set_keymap(bufnr, 'n', 'gr', '<cmd>lua vim.lsp.buf.references()<CR>', opts)
  vim.api.nvim_buf_set_keymap(bufnr, 'n', '<leader>f', '<cmd>lua vim.lsp.buf.formatting()<CR>', opts)

  vim.api.nvim_buf_set_keymap(bufnr, 'n', '<leader>e', '<cmd>lua vim.diagnostic.open_float()<CR>', opts)

end)


lsp.setup()