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([[
  augroup packer_user_config
    autocmd!
    autocmd BufWritePost plugins.lua source <afile> | PackerCompile
  augroup end
]])
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'
utils.opt('o', 'swapfile', false)
utils.opt('o', 'backup', false)
utils.opt('o', 'spelllang', 'en,de')
local indent = 2
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>')
-------------------- TELESCOPE -----------------------------
utils.map('n', '<leader>f', '<cmd>Telescope find_files<cr>')
utils.map('n', '<C-p>', '<cmd>Telescope find_files<cr>')
utils.map('n', '<leader>g', '<cmd>Telescope git_files<cr>')
utils.map('n', '<leader>o', '<cmd>Telescope oldfiles<cr>')
utils.map('n', '<leader>h', '<cmd>Telescope command_history<cr>')
utils.map('n', '<C-S-p>', '<cmd>Telescope commands<cr>')
utils.map('n', '<leader>fb', '<cmd>Telescope buffers<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()
-------------------- CMP -----------------------------------
require('cmp_plug')
-- local cmp = require'cmp'
-- cmp.setup({
--   snippet = {
--     expand = function(args)
--       vim.fn["vsnip#anonymous"](args.body)
--     end,
--   },
--   mapping = {
--     ['<C-y>'] = cmp.mapping.confirm({ select = true }),
--   },
--   sources = {
--     { name = '...' },
--     ...
--   }
-- })
-- local cmp = require 'cmp'
-- local types = require('cmp.types')
-- cmp.setup {
--   completion = {
--     autocomplete = {
--       types.cmp.TriggerEvent.TextChanged,
--     },
--     completeopt = 'menu,menuone,noselect',
--     keyword_pattern = [[\%(-\?\d\+\%(\.\d\+\)\?\|\h\w*\%(-\w*\)*\)]],
--     keyword_length = 1,
--     get_trigger_characters = function(trigger_characters)
--       return trigger_characters
--     end
--   },
--   snippet = {
--     expand = function(args)
--       require('luasnip').lsp_expand(args.body)
--     end,
--   },
--   mapping = {
--     ['<C-p>'] = cmp.mapping.select_prev_item(),
--     ['<C-n>'] = cmp.mapping.select_next_item(),
--     ['<C-d>'] = cmp.mapping.scroll_docs(-4),
--     ['<C-f>'] = cmp.mapping.scroll_docs(4),
--     ['<C-Space>'] = cmp.mapping.complete(),
--     ['<C-e>'] = cmp.mapping.close(),
--     ['<CR>'] = cmp.mapping.confirm {
--       behavior = cmp.ConfirmBehavior.Replace,
--       select = true,
--     },
--     ['<Tab>'] = function(fallback)
--       if vim.fn.pumvisible() == 1 then
--         vim.fn.feedkeys(vim.api.nvim_replace_termcodes('<C-n>', true, true, true), 'n')
--       elseif luasnip.expand_or_jumpable() then
--         vim.fn.feedkeys(vim.api.nvim_replace_termcodes('<Plug>luasnip-expand-or-jump', true, true, true), '')
--       else
--         fallback()
--       end
--     end,
--     ['<S-Tab>'] = function(fallback)
--       if vim.fn.pumvisible() == 1 then
--         vim.fn.feedkeys(vim.api.nvim_replace_termcodes('<C-p>', true, true, true), 'n')
--       elseif luasnip.jumpable(-1) then
--         vim.fn.feedkeys(vim.api.nvim_replace_termcodes('<Plug>luasnip-jump-prev', true, true, true), '')
--       else
--         fallback()
--       end
--     end,
--   },
  -- sources = {
  --   { name = 'nvim_lsp' },
  --   { name = 'luasnip' },
  -- },
-- }
-------------------- NVIM-TREE -----------------------------
g.nvim_tree_auto_open = 1
-------------------- NVIM-COMMENT --------------------------
require('nvim_comment').setup()
require('nvim_comment').setup({line_mapping = '<C-#>', operator_mapping = '<C-#>'})
utils.map('n', '<A-#>', 'gcc')
utils.map('v', '<A-#>', 'gc')