--vim:set ts=2 sw=2 et:

--fix different locale settings when ssh'ing
vim.o.encoding = 'utf-8'

vim.o.syntax = 'on'

--display all matching files when we tab complete
vim.o.wildmenu	 = true

--replace vertical split pipe character with space
vim.o.fillchars = 'vert:|,fold: '

--Having longer updatetime (default is 4000 ms = 4 s) leads to noticeable
--delays and poor user experience.
vim.o.updatetime = 300

vim.o.splitright = true
vim.o.splitbelow = true

--switch buffers without writing to file
vim.o.hidden = true  

--fold indents
vim.o.foldmethod = 'indent'

--don't open folds when jumping over one with (, {, [[ or [{
vim.opt.foldopen = vim.opt.foldopen - { 'block' }

--search down into subfolders
--provides tab-completion for all file-related tasks
vim.opt.path = vim.opt.path + { '**' }

--line numbers
vim.o.number = true

--changes to current directory when creating new files
vim.o.autochdir = true

--higlhight search
vim.o.hls = true

--search as characters are entered
vim.o.incsearch = true

--line for linewrapping
vim.o.colorcolumn = '80'

--wrap text instead of being on one line
vim.o.lbr = true

--default Colors for CursorLine
vim.o.cursorline = true

vim.o.termguicolors = true
vim.o.background = 'dark'
vim.cmd('colorscheme space_vim_theme')

--enable statusbar
vim.o.laststatus = 2
vim.o.statusline = ' %F %m%r%w %= %{hostname()}   %{strlen(&ft)?&ft:"none"} %{(&bomb?",BOM":"")} %{&ff}  %l/%L  %c %P'

--open folds by default
vim.cmd('autocmd Syntax * normal zR')

--file specific formatting
vim.cmd[[
	autocmd Filetype python,bash,sh,java,php,json
	\ setlocal tabstop=4 softtabstop=4 shiftwidth=4
	\ expandtab autoindent fileformat=unix
]]

vim.cmd[[
	autocmd Filetype css,scss,html,htmldjango,javascript,yaml
	\ setlocal tabstop=2 softtabstop=2 shiftwidth=2
	\ expandtab autoindent
]]

--color trailing spaces with red color
vim.cmd('highlight ExtraWhitespace ctermbg=green guibg=green')
vim.cmd('match ExtraWhitespace /s+$/')
vim.cmd('autocmd BufWinEnter * match ExtraWhitespace /s+$/')
vim.cmd('autocmd InsertEnter * match ExtraWhitespace /s+%#@<!$/')
vim.cmd('autocmd InsertLeave * match ExtraWhitespace /s+$/')
vim.cmd('autocmd BufWinLeave * call clearmatches()')

--TODO split lsp configuration into separate files
local nvim_lsp = require('lspconfig')

--add additional capabilities supported by nvim-cmp
local capabilities = vim.lsp.protocol.make_client_capabilities()
capabilities = require('cmp_nvim_lsp').update_capabilities(capabilities)

--use an on_attach function to only map the following keys
--after the language server attaches to the current buffer
local on_attach = function(client, 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

  -- Enable completion triggered by <c-x><c-o>
  buf_set_option('omnifunc', 'v:lua.vim.lsp.omnifunc')

  -- Mappings.
  local opts = { noremap=true, silent=true }

  --see `:help vim.lsp.*` for documentation on any of the below functions
  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)
end

--enable some language servers with the additional completion capabilities
--offered by nvim-cmp
local servers = { 'pyright', }
for _, lsp in ipairs(servers) do
  nvim_lsp[lsp].setup {
    on_attach = on_attach,
    capabilities = capabilities,
  }
end

--nvim-cmp setup
local cmp = require('cmp')
cmp.setup {
  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 cmp.visible() then
        cmp.select_next_item()
      else
        fallback()
      end
    end,
    ['<S-Tab>'] = function(fallback)
      if cmp.visible() then
        cmp.select_prev_item()
      else
        fallback()
      end
    end,
  },
  sources = {
    { name = 'nvim_lsp' },
  },
}