vim.cmd [[set runtimepath=$VIMRUNTIME]]
vim.cmd [[set packpath=/tmp/nvim/site]]

local package_root = "/tmp/nvim/site/pack"
local install_path = package_root .. "/packer/start/packer.nvim"

local function load_plugins()
  require("packer").startup {
    {
      "wbthomason/packer.nvim",
      "neovim/nvim-lspconfig",
      {
        "aserowy/tmux.nvim",
        config = function()
          require("tmux").setup {
            navigation = {
              -- cycles to opposite pane while navigating into the border
              cycle_navigation = true,

              -- enables default keybindings (C-hjkl) for normal mode
              enable_default_keybindings = true,

              -- prevents unzoom tmux when navigating beyond vim border
              persist_zoom = true,
            },
            resize = {
              -- enables default keybindings (A-hjkl) for normal mode
              enable_default_keybindings = true,
            },
          }
        end,
      },
    },
    config = {
      package_root = package_root,
      compile_path = install_path .. "/plugin/packer_compiled.lua",
    },
  }
end

_G.load_config = function()
  vim.lsp.set_log_level "trace"
  local nvim_lsp = require "lspconfig"
  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

    buf_set_option("omnifunc", "v:lua.vim.lsp.omnifunc")

    -- 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("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", "gr", "<cmd>lua vim.lsp.buf.references()<CR>", opts)
    buf_set_keymap("n", "<space>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", "<space>q", "<cmd>lua vim.lsp.diagnostic.set_loclist()<CR>", opts)
    buf_set_keymap("n", "<space>li", "<cmd>LspInfo<CR>", opts)
  end

  -- Add the server that troubles you here
  local name = "sumneko_lua"
  local sumneko_root_dir = vim.fn.stdpath "data" .. "/lsp_servers/sumneko_lua/extension/server"
  local cmd = { sumneko_root_dir .. "/bin/Linux/lua-language-server", "-E", sumneko_root_dir .. "/main.lua" }
  if not name then
    print "You have not defined a server name, please edit minimal_init.lua"
  end
  if not nvim_lsp[name].document_config.default_config.cmd and not cmd then
    print [[You have not defined a server default cmd for a server
      that requires it please edit minimal_init.lua]]
  end

  nvim_lsp[name].setup {
    cmd = cmd,
    on_attach = on_attach,
  }

  print [[You can find your log at $HOME/.cache/nvim/lsp.log. Please paste in a github issue under a details tag as described in the issue template.]]
end

if vim.fn.isdirectory(install_path) == 0 then
  vim.fn.system { "git", "clone", "https://github.com/wbthomason/packer.nvim", install_path }
  load_plugins()
  require("packer").sync()
  vim.cmd [[autocmd User PackerComplete ++once lua load_config()]]
else
  load_plugins()
  require("packer").sync()
  _G.load_config()
end