"""""""""""""""""""""""""""""""
" Plugin Manager
"""""""""""""""""""""""""""""""

call plug#begin('~/.vim/plugged')

""""""""""""""""""""""""""""""
" Plugins

Plug 'morhetz/gruvbox', {'rtp': 'vim'} " Color theme
Plug 'junegunn/fzf'                    " Used for commands like :Commits, :History, :Files
Plug 'junegunn/fzf.vim'
Plug 'preservim/nerdtree'      " Browse directories (:NERDTree)
Plug 'Raimondi/delimitMate'    " Autocomplete brackets and quotes
Plug 'tomtom/tcomment_vim'     " Toggle comments (gc, gcc)
Plug 'godlygeek/tabular'       " Line up text by a given character (:Tabularize /CHAR)
Plug 'vim-syntastic/syntastic' " Syntax error checker
Plug 'neoclide/coc.nvim', {'branch': 'release'} " IntelliSense practically
Plug 'itchyny/lightline.vim'   " Statusline for Vim
Plug 'tpope/vim-fugitive'      " git integration
Plug 'mbbill/undotree'         " Easily interact with undo history
Plug 'OmniSharp/omnisharp-vim' " C# tools (autocompletion, ...)
Plug 'wakatime/vim-wakatime'   " Time tracking via wakaime.com 
Plug 'dense-analysis/ale'      " Syntax checker via LSP
Plug 'ryanoasis/vim-devicons'  " Icons on stuff like NERDTree
Plug 'honza/vim-snippets'      " Ready snippets for some langauges
Plug 'pseewald/vim-anyfold'    " Better folding

""""""""""""""""""""""""""""""""

call plug#end()

"""""""""""""""""""""""""""""""
" Color scheme settings
"""""""""""""""""""""""""""""""

colorscheme gruvbox
set background=dark " Setting dark mode
let g:gruvbox_contrast_dark='medium'

"""""""""""""""""""""""""""""""
" NERDTree settings
"""""""""""""""""""""""""""""""

let NERDTreeCustomOpenArgs={'file':{'where': 't'}} " Open file in new tab, doesn't work only for double-click
let NERDTreeShowHidden=1
" Toggle NERDTree with Tab
nmap <Tab> :NERDTreeToggle<CR>

"""""""""""""""""""""""""""""""
" Undotree settings
"""""""""""""""""""""""""""""""

" Toggle undotree with F5
nmap <F5> :UndotreeToggle<CR>  

if !exists('g:undotree_WindowLayout')
    let g:undotree_WindowLayout = 2
endif

" e.g. using 'd' instead of 'days' to save some space.
if !exists('g:undotree_ShortIndicators')
    let g:undotree_ShortIndicators = 1
endif

" if set, let undotree window get focus after being opened, otherwise
" focus will stay in current window.
if !exists('g:undotree_SetFocusWhenToggle')
    let g:undotree_SetFocusWhenToggle = 1
endif

" tree node shape.
if !exists('g:undotree_TreeNodeShape')
    let g:undotree_TreeNodeShape = '*'
endif

if !exists('g:undotree_DiffCommand')
    let g:undotree_DiffCommand = "diff"
endif

"""""""""""""""""""""""""""""""
" Syntastic settings
"""""""""""""""""""""""""""""""

set statusline+=%#warningmsg#
set statusline+=%{SyntasticStatuslineFlag()}
set statusline+=%*

let g:syntastic_always_populate_loc_list=1
let g:syntastic_auto_loc_list=1
let g:syntastic_check_on_open=1
let g:syntastic_check_on_wq=0

"""""""""""""""""""""""""""""""
" Vim-anyfold settings
"""""""""""""""""""""""""""""""

filetype plugin indent on
syntax on
autocmd Filetype * AnyFoldActivate " activate for all filetypes
set foldlevel=99 " Open all folds by default

"""""""""""""""""""""""""""""""
" Vim settings
"""""""""""""""""""""""""""""""

autocmd InsertEnter,InsertLeave * set cul! " Highlight current line, when in insert mode
set backspace=indent,eol,start " Better backspace functionality
set scrolloff=0                " Don't keep any screen lines above or below the cursor

" Thin cursor in insert mode in Gnome-Terminal (version >=3.16 ; also works with Terminator)
if has("autocmd")
  au VimEnter,InsertLeave * silent execute '!echo -ne "\e[1 q"' | redraw!
  au InsertEnter,InsertChange *
    \ if v:insertmode == 'i' | 
    \   silent execute '!echo -ne "\e[5 q"' | redraw! |
    \ elseif v:insertmode == 'r' |
    \   silent execute '!echo -ne "\e[3 q"' | redraw! |
    \ endif
  au VimLeave * silent execute '!echo -ne "\e[ q"' | redraw!
endif

" Ctrl+c, Ctrl+v, Ctrl+z, Ctrl+a and Ctrl+s bindings 
" Partly taken from: https://gist.github.com/jshih/3423345
vmap <C-c> "+yi<Esc>
vmap <C-x> "+c<Esc>
vmap <C-v> c<ESC>"+p<Esc>
imap <C-v> <ESC>"+pa
map  <C-a> ggVG
imap <C-z> <ESC>ui
imap <C-r> <ESC><C-r>i
"imap <C-S-z> <C-r> An impossible dream
imap <C-s> <ESC>:w<CR>a

" The following work the same as usual (as :x and :xa), but can also close running jobs (e.g. terminal windows)
ca x  w <bar> q!
ca xa wa <bar> qa!

ca tt tab ter
ca te tabe

" Go between tabs with Ctrl+k (tab to the right) and Ctrl+j (tab to the left)
nnoremap <C-k> :tabn<CR>
nnoremap <C-j> :tabp<CR>

set number     " Show line numbers to the left

nnoremap = :tab ter ++close lazygit<CR>

" Don't get into insert mode after adding a line with o/O
nnoremap o o<Esc>
nnoremap O O<Esc>

" Do omni completion from Ctrl+Space
nnoremap <C-Space> <C-X><C-O>

set mouse=a " Mouse support

set tabstop=4                           " Show tabs as 4 wide
set shiftwidth=4                        " Indent with 4 spaces
" set expandtab                           " Convert tabs to spaces
autocmd Filetype css setlocal tabstop=2 " Show CSS tabs as 2 spaces

" When you press F6 it will toggle a "spell check mode", 
" spell is activated and the colorscheme is changed
nmap <F6> :call SpellCheckModeToggle()<CR>

function! SpellCheckModeToggle()
   if g:colors_name == 'gruvbox'
       set spell
       colorscheme darkblue
   else
       set nospell
       colorscheme gruvbox
   endif
endfunction

" Scrolling (shows history) in terminal (except in lazygit)
" Scroll up to activate it, and press a to deactivate it
" Slightly modified version of: https://github.com/vim/vim/issues/2490#issuecomment-393973253
function! ExitNormalMode()
    unmap <buffer> <silent> <RightMouse>
    call feedkeys("a")
endfunction

function! EnterNormalMode()
    if @% == '!lazygit'
        tunmap <silent> <ScrollWheelUp>
    elseif &buftype == 'terminal' && mode('') == 't'
        call feedkeys("\<c-w>N")
        call feedkeys("\<c-y>")
        map <buffer> <silent> <RightMouse> :call ExitNormalMode()<CR>
    endif
endfunction

tmap <silent> <ScrollWheelUp> <c-w>:call EnterNormalMode()<CR>

"""""""""""""""""""""""""""""""
" Lighline settings
"""""""""""""""""""""""""""""""

set laststatus=2

if !has('gui_running')
  set t_Co=256
endif

let g:lightline = { 
      \ 'colorscheme': 'wombat',
      \ 'active': {
      \   'left': [ [ 'mode', 'paste' ],
      \             [ 'gitbranch', 'filename', 'charvaluehex', 'readonly', 'modified' ] ],
      \   'right': [ [ 'lineinfo' ],
      \              [ 'fileencoding', 'filetype'] ]
      \ },
      \ 'component': {
      \   'charvaluehex': '0x%B',
      \ },
      \ 'component_function': {
	  \   'gitbranch': 'LightlineFugitive',
	  \   'readonly': 'LightlineReadonly',
	  \   'modified': 'LightlineModified',
	  \   'filetype': 'LightlineFileType'
      \ },
	  \ 'tabline': {
	  \   'right': [[]]
	  \ },
	  \ 'tab': {
	  \   'active': [ 'iconFilename','iconReadonly', 'iconModified' ],
	  \   'inactive': [ 'iconFilename', 'iconReadonly', 'iconModified' ]
	  \ },
	  \ 'tab_component_function': {
	  \   'iconFilename': 'LightlineTabFilename',
	  \   'iconReadonly': 'LightlineTabReadonly',
	  \   'iconModified': 'LightlineTabModified',
	  \   'iconClose': 'LightlineTabIconClose'
	  \ },
      \ 'separator': { 'left': '', 'right': '' },
      \ 'subseparator': { 'left': '', 'right': '' },
	  \ 'tabline_separator': { 'left': '▒', 'right': '' },
	  \ 'tabline_subseparator': { 'left': '░' }
      \ }

" Most of the following functions are just modification of source: 
" Examples from doc file - https://github.com/itchyny/lightline.vim/blob/53176a0b75d6389d775d7bce0d494e58fc654f38/doc/lightline.txt#L583
" Tab source code - https://github.com/itchyny/lightline.vim/blob/master/autoload/lightline/tab.vim

function! LightlineFugitive()
	if exists('*FugitiveHead')
	    let branch = FugitiveHead()
		return branch !=# '' ? ' '.branch : ''
	endif
		return ''
endfunction

function! LightlineReadonly()
	return &ft !~? 'help\|vimfiler' && &readonly ? '' : ''
endfunction

function! LightlineModified()
	return &ft =~ 'help\|vimfiler' ? '' : &modified ? '' : &modifiable ? '' : ''
endfunction

function! LightlineFileType()
  return strlen(&filetype) ? WebDevIconsGetFileTypeSymbol() . ' ' . &filetype : ''
endfunction

" Adds the filetype icon in tabs
function! LightlineTabFilename(n) abort
	let buflist = tabpagebuflist(a:n)
	let winnr = tabpagewinnr(a:n)
  	let _ = expand('#'.buflist[winnr - 1].':t')
	return WebDevIconsGetFileTypeSymbol(_) . ' ' . ( _ !=# '' ? _ : '[No Name]' )
endfunction

function! LightlineTabReadonly(n) abort
	let winnr = tabpagewinnr(a:n)
	return gettabwinvar(a:n, winnr, '&readonly') ? '' : ''
endfunction

function! LightlineTabModified(n) abort
	let winnr = tabpagewinnr(a:n)
	return gettabwinvar(a:n, winnr, '&modified') ? '' : gettabwinvar(a:n, winnr, '&modifiable') ? '' : ''
endfunction

"""""""""""""""""""""""""""""""
" Enable Omni completion
"""""""""""""""""""""""""""""""

" Omni completion supports C, HTML, CSS, JavaScript, PHP, Python, Ruby, SQL, XML

filetype plugin on
set omnifunc=syntaxcomplete#Complete " Completion for all supported languages

"""""""""""""""""""""""""""""""
" Ale settings
"""""""""""""""""""""""""""""""

let g:ale_linters = {
\ 'cs': ['OmniSharp'],
\}
let b:ale_linters = ['cs']

"""""""""""""""""""""""""""""""
" OmniSharp settings
"""""""""""""""""""""""""""""""

autocmd Filetype cs nmap <silent> <buffer> gd   : OmniSharpGotoDefinition<CR>
autocmd Filetype cs nmap <silent> <buffer> gy   : OmniSharpTypeLookup<CR>
autocmd Filetype cs nmap <silent> <buffer> gi   : OmniSharpFindImplementations<CR>
autocmd Filetype cd nmap <silent> <buffer> gr   : OmniSharpFindUsages<CR>
autocmd FileType cs nmap <silent> <buffer> <F2> : OmniSharpRename<CR>
autocmd FileType cs nmap <silent> <buffer> ff   : OmniSharpCodeFormat<CR>
autocmd FileType cs nmap <silent> <buffer> fu   : OmniSharpFixUsings<CR>

"""""""""""""""""""""""""""""""
" COC settings
"""""""""""""""""""""""""""""""

" All of the following is the example configuration with some values modified
" https://github.com/neoclide/coc.nvim#example-vim-configuration

" TextEdit might fail if hidden is not set.
set hidden

" Some servers have issues with backup files, see #649.
set nobackup
set nowritebackup

" Give more space for displaying messages.
set cmdheight=2

" Having longer update time (default is 4000 ms = 4 s) leads to noticeable
" delays and poor user experience.
set updatetime=300

" Don't pass messages to |ins-completion-menu|.
set shortmess+=c

" Always show the signcolumn, otherwise it would shift the text each time
" diagnostics appear/become resolved.
if has("patch-8.1.1564")
  " Recently vim can merge signcolumn and number column into one
  set signcolumn=number
else
  set signcolumn=yes
endif

" Use tab for trigger completion with characters ahead and navigate.
" NOTE: Use command ':verbose imap <tab>' to make sure tab is not mapped by
" other plugin before putting this into your config.
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.
if has('nvim')
  inoremap <silent><expr> <c-space> coc#refresh()
else
  inoremap <silent><expr> <c-@> coc#refresh()
endif

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

" Use `[g` and `]g` to navigate diagnostics
" Use `:CocDiagnostics` to get all diagnostics of current buffer in location list.
nmap <silent> [g <Plug>(coc-diagnostic-prev)
nmap <silent> ]g <Plug>(coc-diagnostic-next)

" 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>')
  else
    call CocAction('doHover')
  endif
endfunction

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

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

" Formatting selected code.
xmap <leader>f  <Plug>(coc-format-selected)
nmap <leader>f  <Plug>(coc-format-selected)

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 buffer.
nmap <leader>ac  <Plug>(coc-codeaction)
" Apply AutoFix to problem on the current line.
nmap <leader>qf  <Plug>(coc-fix-current)

" Map function and class text objects
" NOTE: Requires 'textDocument.documentSymbol' support from the language server.
xmap if <Plug>(coc-funcobj-i)
omap if <Plug>(coc-funcobj-i)
xmap af <Plug>(coc-funcobj-a)
omap af <Plug>(coc-funcobj-a)
xmap ic <Plug>(coc-classobj-i)
omap ic <Plug>(coc-classobj-i)
xmap ac <Plug>(coc-classobj-a)
omap ac <Plug>(coc-classobj-a)

" Use CTRL-S for selections ranges.
" Requires 'textDocument/selectionRange' support of language server.
nmap <silent> <C-s> <Plug>(coc-range-select)
xmap <silent> <C-s> <Plug>(coc-range-select)

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