local cmd = vim.cmd  -- to execute Vim commands e.g. cmd('pwd')
local fn = vim.fn    -- to call Vim functions e.g. fn.bufnr()
local g = vim.g      -- a table to access global variables
local opt = vim.opt  -- to set options

local fn = vim.fn

-- Auto install packer.nvim if not exists
local fn = vim.fn
local install_path = fn.stdpath('data')..'/site/pack/packer/start/packer.nvim'
if fn.empty(fn.glob(install_path)) > 0 then
  fn.system({'git', 'clone', '--depth', '1', 'https://github.com/wbthomason/packer.nvim', install_path})
  vim.cmd 'packadd packer.nvim'
end
vim.cmd [[packadd packer.nvim]]
vim.cmd 'autocmd BufWritePost plugins.lua PackerCompile' -- Auto compile when there are changes in plugins.lua

local utils = require('utils')
-- Install plugins
require('plugins')
require('keymappings')
-------------------- OPTIONS -------------------------------
cmd 'colorscheme gruvbox-material'            -- Put your favorite colorscheme here
cmd 'syntax enable'
cmd 'filetype plugin indent on'
--opt.noswapfile = true
-- opt.nobackup = true
opt.spelllang = 'en,de'
local indent = 4
utils.opt('b', 'expandtab', true)
utils.opt('b', 'shiftwidth', indent)
utils.opt('b', 'smartindent', true)
utils.opt('b', 'tabstop', indent)
utils.opt('o', 'hidden', true)
utils.opt('o', 'ignorecase', true)
utils.opt('o', 'scrolloff', 4 )
utils.opt('o', 'shiftround', true)
utils.opt('o', 'relativenumber', true)
utils.opt('o', 'smartcase', true)
utils.opt('o', 'splitbelow', true)
utils.opt('o', 'splitright', true)
utils.opt('o', 'wildmode', 'list:longest')
utils.opt('w', 'number', true)
utils.opt('w', 'relativenumber', true)
utils.opt('o', 'clipboard', 'unnamed,unnamedplus')
utils.opt('o', 'mouse', 'a')
utils.opt('o', 'wrap', false)
utils.opt('o', 'termguicolors', true)
utils.opt('o', 'splitbelow', true)
utils.opt('o', 'splitright', true)
utils.opt('o', 'list', true)

-- Highlight on yank
vim.cmd 'au TextYankPost * lua vim.highlight.on_yank {on_visual = false}'

-------------------- MAPPINGS ------------------------------
-- <Tab> to navigate the completion menu
utils.map('i', '<S-Tab>', 'pumvisible() ? "\\<C-p>" : "\\<Tab>"', {expr = true})
utils.map('i', '<Tab>', 'pumvisible() ? "\\<C-n>" : "\\<Tab>"', {expr = true})
-------------------- TREE-SITTER ---------------------------
local ts = require 'nvim-treesitter.configs'
ts.setup {ensure_installed = 'maintained', highlight = {enable = true}}

-------------------- FZF -----------------------------------
utils.map('n', '<C-P>', ':FZF<CR>')
-------------------- LSP -----------------------------------
local lsp = require 'lspconfig'

-- We use the default settings for ccls and pylsp: the option table can stay empty
lsp.ccls.setup {}
lsp.pyright.setup{}
lsp.clangd.setup{}

utils.map('n', '<space>,', '<cmd>lua vim.lsp.diagnostic.goto_prev()<CR>')
utils.map('n', '<space>;', '<cmd>lua vim.lsp.diagnostic.goto_next()<CR>')
utils.map('n', '<space>a', '<cmd>lua vim.lsp.buf.code_action()<CR>')
utils.map('n', '<space>d', '<cmd>lua vim.lsp.buf.definition()<CR>')
utils.map('n', '<space>f', '<cmd>lua vim.lsp.buf.formatting()<CR>')
utils.map('n', '<space>h', '<cmd>lua vim.lsp.buf.hover()<CR>')
utils.map('n', '<space>m', '<cmd>lua vim.lsp.buf.rename()<CR>')
utils.map('n', '<space>r', '<cmd>lua vim.lsp.buf.references()<CR>')
utils.map('n', '<space>s', '<cmd>lua vim.lsp.buf.document_symbol()<CR>')

-------------------- GITSIGNS ------------------------------
require('gitsigns').setup()
-------------------- LIGHTBULB -----------------------------
require('nvim-lightbulb').update_lightbulb()