" Use tab for trigger completion with characters ahead and navigate.
inoremap <silent><expr> <TAB>
      \ pumvisible() ? "\<C-n>" :
      \ <SID>check_back_space() ? "\<TAB>" :
      \ coc#refresh()
inoremap <expr><S-TAB> pumvisible() ? "\<C-p>" : "\<C-h>"

function! s:check_back_space() abort
  let col = col('.') - 1
  return !col || getline('.')[col - 1]  =~# '\s'
endfunction

" Use <c-space> to trigger completion.
inoremap <silent><expr> <c-space> coc#refresh()

" Use <cr> to confirm completion, `<C-g>u` means break undo chain at current
" position. Coc only does snippet and additional edit on confirm.
if exists('*complete_info')
  inoremap <expr> <cr> complete_info()["selected"] != "-1" ? "\<C-y>" : "\<C-g>u\<CR>"
else
  imap <expr> <cr> pumvisible() ? "\<C-y>" : "\<C-g>u\<CR>"
endif

" GoTo code navigation.
nmap <silent> gd <Plug>(coc-definition)
nmap <silent> gy <Plug>(coc-type-definition)
nmap <silent> gi <Plug>(coc-implementation)
nmap <silent> gr <Plug>(coc-references)

" Use K to show documentation in preview window.
nnoremap <silent> K :call <SID>show_documentation()<CR>

function! s:show_documentation()
  if (index(['vim','help'], &filetype) >= 0)
    execute 'h '.expand('<cword>')
  elseif (coc#rpc#ready())
    call CocActionAsync('doHover')
  else
    execute '!' . &keywordprg . " " . expand('<cword>')
  endif
endfunction

" set keywordprg=:call\ CocActionAsync('doHover')
" augroup VimHelp
"   autocmd!
"   autocmd Filetype vim,help setlocal keywordprg=:help
" augroup END

" Highlight the symbol and its references when holding the cursor.
autocmd CursorHold * silent call CocActionAsync('highlight')

" Symbol renaming.
" nmap <leader>rn <Plug>(coc-rename)

augroup mygroup
  autocmd!
  " Setup formatexpr specified filetype(s).
  autocmd FileType typescript,json setl formatexpr=CocAction('formatSelected')
  " Update signature help on jump placeholder.
  autocmd User CocJumpPlaceholder call CocActionAsync('showSignatureHelp')
augroup end

" Applying codeAction to the selected region.
" Example: `<leader>aap` for current paragraph
" xmap <leader>a  <Plug>(coc-codeaction-selected)
" nmap <leader>a  <Plug>(coc-codeaction-selected)

" Remap keys for applying codeAction to the current line.
" nmap <leader>ac  <Plug>(coc-codeaction)
" Apply AutoFix to problem on the current line.
" nmap <leader>qf  <Plug>(coc-fix-current)

" Introduce function text object
" NOTE: Requires 'textDocument.documentSymbol' support from the language server.
xmap if <Plug>(coc-funcobj-i)
xmap af <Plug>(coc-funcobj-a)
omap if <Plug>(coc-funcobj-i)
omap af <Plug>(coc-funcobj-a)

" Remap <C-f> and <C-b> for scroll float windows/popups.
" Note coc#float#scroll works on neovim >= 0.4.3 or vim >= 8.2.0750
nnoremap <nowait><expr> <C-f> coc#float#has_scroll() ? coc#float#scroll(1) : "\<C-f>"
nnoremap <nowait><expr> <C-b> coc#float#has_scroll() ? coc#float#scroll(0) : "\<C-b>"
inoremap <nowait><expr> <C-f> coc#float#has_scroll() ? "\<c-r>=coc#float#scroll(1)\<cr>" : "\<Right>"
inoremap <nowait><expr> <C-b> coc#float#has_scroll() ? "\<c-r>=coc#float#scroll(0)\<cr>" : "\<Left>"

" NeoVim-only mapping for visual mode scroll
" Useful on signatureHelp after jump placeholder of snippet expansion
if has('nvim')
  vnoremap <nowait><expr> <C-f> coc#float#has_scroll() ? coc#float#nvim_scroll(1, 1) : "\<C-f>"
  vnoremap <nowait><expr> <C-b> coc#float#has_scroll() ? coc#float#nvim_scroll(0, 1) : "\<C-b>"
endif

" Add `:Format` command to format current buffer.
command! -nargs=0 Format :call CocAction('format')

" Add `:Fold` command to fold current buffer.
command! -nargs=? Fold :call     CocAction('fold', <f-args>)

" Add `:OR` command for organize imports of the current buffer.
command! -nargs=0 OR   :call     CocAction('runCommand', 'editor.action.organizeImport')

" Add (Neo)Vim's native statusline support.
" NOTE: Please see `:h coc-status` for integrations with external plugins that
" provide custom statusline: lightline.vim, vim-airline.
" set statusline^=%{coc#status()}%{get(b:,'coc_current_function','')}

" Mappings using CoCList:
" Show all diagnostics.
" TODO add these to which key
" nnoremap <silent> <space>a  :<C-u>CocList diagnostics<cr>
" " Manage extensions.
" nnoremap <silent> <space>e  :<C-u>CocList extensions<cr>
" " Show commands.
" nnoremap <silent> <space>c  :<C-u>CocList commands<cr>
" " Find symbol of current document.
" nnoremap <silent> <space>o  :<C-u>CocList outline<cr>
" " Search workspace symbols.
" nnoremap <silent> <space>s  :<C-u>CocList -I symbols<cr>
" " Do default action for next item.
" nnoremap <silent> <space>j  :<C-u>CocNext<CR>
" " Do default action for previous item.
" nnoremap <silent> <space>k  :<C-u>CocPrev<CR>
" " Resume latest coc list.
" nnoremap <silent> <space>p  :<C-u>CocListResume<CR>

" Explorer
let g:coc_explorer_global_presets = {
\   'floating': {
\      'position': 'floating',
\   },
\   'floatingLeftside': {
\      'position': 'floating',
\      'floating-position': 'left-center',
\      'floating-width': 30,
\   },
\   'floatingRightside': {
\      'position': 'floating',
\      'floating-position': 'right-center',
\      'floating-width': 30,
\   },
\   'simplify': {
\     'file.child.template': '[selection | clip | 1] [indent][icon | 1] [filename omitCenter 1]'
\   }
\ }
"nmap <silent> <space>e :CocCommand explorer<CR>
" nnoremap <silent> <leader>e :CocCommand explorer<CR>
" nmap <space>f :CocCommand explorer --preset floatingRightside<CR>
autocmd BufEnter * if (winnr("$") == 1 && &filetype == 'coc-explorer') | q | endif

" Snippets
" Use <C-l> for trigger snippet expand.
imap <C-l> <Plug>(coc-snippets-expand)

" Use <C-j> for select text for visual placeholder of snippet.
vmap <C-j> <Plug>(coc-snippets-select)

" Use <C-j> for jump to next placeholder, it's default of coc.nvim
let g:coc_snippet_next = '<c-j>'

" Use <C-k> for jump to previous placeholder, it's default of coc.nvim
let g:coc_snippet_prev = '<c-k>'

" Use <C-j> for both expand and jump (make expand higher priority.)
imap <C-j> <Plug>(coc-snippets-expand-jump)

augroup MyCocExplorer
  autocmd!
  autocmd VimEnter * sil! au! FileExplorer *
  autocmd BufEnter * let d = expand('%') | if isdirectory(d) | silent! bd | exe 'CocCommand explorer ' . d | endif
augroup END
