" Vim 9 configuration shared across Linux, WSL, Windows, and macOS.
if v:version < 900
  echoerr 'This configuration requires Vim 9 or newer.'
  finish
endif

let g:dotfiledir = fnamemodify(resolve(expand('<sfile>:p')), ':h') . '/'
let g:dotvimdir = g:dotfiledir . 'config/vim'
let g:vim_dir = has('win32') || has('win64') ? expand('~/vimfiles') : expand('~/.vim')
execute 'set runtimepath+=' . fnameescape(g:dotvimdir)

if has('win32') || has('win64')
  if executable('pwsh')
    set shell=pwsh
  elseif executable('powershell')
    set shell=powershell
  endif
endif

let mapleader = ','
let maplocalleader = '_'

filetype plugin indent on
syntax enable
set encoding=utf-8
set belloff=all
set mouse=a
set hidden
set history=1000
set updatetime=300
set shortmess+=filmnrxoOtTF
set backspace=indent,eol,start
set number
set cursorline
set cursorlineopt=number
set noshowmode
set showmatch
set incsearch
set hlsearch
set ignorecase
set smartcase
set wildmenu
set wildmode=list:longest,full
set scrolloff=5
set sidescrolloff=5
set splitright
set splitbelow
set display=lastline
set expandtab
set shiftwidth=4
set tabstop=4
set softtabstop=4
set autoindent
set nojoinspaces
set list
set listchars=tab:•\ ,trail:•,extends:»,precedes:«
let &fillchars = 'eob: ,vert:│,stl: ,stlnc: '
set foldmethod=syntax
set foldlevelstart=99
set undofile
set undolevels=1000
set undoreload=10000
set viewoptions=folds
if has('termguicolors') && (!has('win32') || has('vcon') || has('gui_running'))
  set termguicolors
endif

for s:dir in ['backup', 'swap', 'undo', 'view']
  let s:path = g:vim_dir . '/' . s:dir
  if !isdirectory(s:path)
    silent! call mkdir(s:path, 'p')
  endif
endfor
execute 'set backupdir=' . fnameescape(g:vim_dir . '/backup//')
execute 'set directory=' . fnameescape(g:vim_dir . '/swap//')
execute 'set undodir=' . fnameescape(g:vim_dir . '/undo//')
execute 'set viewdir=' . fnameescape(g:vim_dir . '/view//')

if has('clipboard')
  if has('macunix') || has('win32') || has('win64')
    set clipboard=unnamed
  else
    set clipboard=unnamedplus
  endif
endif

augroup DotfilesCore
  autocmd!
  autocmd FileType javascript,typescript,lua setlocal tabstop=2 shiftwidth=2 softtabstop=2
  autocmd FileType haskell,ruby,yaml setlocal tabstop=2 shiftwidth=2 softtabstop=2
  autocmd FileType c,cpp,vim,java,python,lua setlocal colorcolumn=80
  autocmd FileType help setlocal colorcolumn=
  autocmd FileType * setlocal formatoptions-=o
  autocmd BufNewFile,BufRead *.html.twig setfiletype html.twig
  autocmd BufReadPost * if line("'\"") > 1 && line("'\"") <= line('$') | execute 'normal! g`"' | endif
  autocmd BufWinLeave ?* if &buftype ==# '' && !empty(expand('%:p')) | silent! mkview | endif
  autocmd BufWinEnter ?* if &buftype ==# '' && !empty(expand('%:p')) | silent! loadview | endif
augroup END

nnoremap j gj
nnoremap k gk
nnoremap Y y$
xnoremap < <gv
xnoremap > >gv
nnoremap <silent> <leader>h :nohlsearch<CR>
nnoremap <leader>ws :%s/\s\+$//e<CR>
nnoremap <Leader>s :%s/\<<C-r><C-w>\>/<C-r><C-w>
nnoremap <silent> <space>q :bprevious<CR>
nnoremap <silent> <space>e :bnext<CR>
nnoremap <silent> <C-w>% :vsplit<CR>
nnoremap <silent> <C-w>" :split<CR>
nnoremap q: <nop>
nnoremap Q <nop>
command! WQ wq
command! Wq wq
command! W write
command! Q quit

" Plugin installation is explicit: run install.sh or :PlugInstall/:PlugUpdate.
let s:plug_vim = g:vim_dir . '/autoload/plug.vim'
if filereadable(s:plug_vim)
  execute 'source ' . fnameescape(s:plug_vim)
  call plug#begin(g:vim_dir . '/plugged')
  Plug 'vim-fuzzbox/fuzzbox.vim'
  Plug 'preservim/nerdtree', { 'on': ['NERDTreeToggle', 'NERDTreeFind'] }
  Plug 'ryanoasis/vim-devicons'

  Plug 'tpope/vim-surround'
  Plug 'tpope/vim-commentary'

  Plug 'mhinz/vim-startify'
  Plug 'Donaldttt/vim-bufferline'
  Plug 'Donaldttt/vim-global-statusline', { 'branch': 'vim9' }

  Plug 'sainnhe/everforest'
  Plug 'NLKNguyen/papercolor-theme'
  call plug#end()
else
  echohl WarningMsg
  echom 'vim-plug is not installed; run install.sh to install plugins.'
  echohl None
endif

let g:fuzzbox_dropdown = 1
let g:fuzzbox_window_defaults = {'maxwidth': 0.8, 'maxheight': 0.8}
let g:fuzzbox_window_options = {
      \ 'files': {'width': 0.8},
      \ 'buffers': {'preview': 1, 'width': 0.8, 'preview_ratio': 0.5},
      \ 'grep': {'preview': 1, 'width': 0.8, 'preview_ratio': 0.5},
      \ 'mru': {'preview': 1}}
nnoremap <silent> <leader>fl :FuzzyCmdHistory<CR>

" NERDTree remains intentionally small; Fuzzbox handles most navigation.
let g:NERDShutUp = 1
let g:NERDTreeMinimalMenu = 1
let g:NERDTreeMinimalUI = 1
let g:NERDTreeChDirMode = 0
let g:NERDTreeQuitOnOpen = 1
let g:NERDTreeMouseMode = 2
let g:NERDTreeShowHidden = 1
let g:NERDTreeMapOpenExpl = ''
let g:NERDTreeDirArrowCollapsible = ''
let g:NERDTreeDirArrowExpandable = ''

function! s:ToggleTree() abort
  if exists('t:NERDTreeBufName') && bufwinnr(t:NERDTreeBufName) != -1
    NERDTreeClose
  elseif &filetype ==# 'startify' || empty(expand('%:p'))
    NERDTreeToggle
  else
    NERDTreeFind
  endif
endfunction
nnoremap <silent> <leader>e :call <SID>ToggleTree()<CR>

let g:bufferline_echo = 0
let g:bufferline_modified = '+'
let g:bufferline_active_buffer_left = '['
let g:bufferline_active_buffer_right = ']'

let g:startify_change_to_dir = 0
let g:startify_files_number = 8
let g:startify_bookmarks = [g:dotfiledir . '.vimrc']
let g:startify_lists = [
      \ {'header': ['   RECENT'], 'type': 'files'},
      \ {'header': ['   BOOKMARKS'], 'type': 'bookmarks'}]

function! s:StatuslineHighlights() abort
  highlight default DotModeNormal cterm=reverse gui=reverse
  highlight default link DotModeInsert DiffAdd
  highlight default link DotModeVisual Visual
  highlight default link DotModeCommand DiffChange
endfunction

function! s:StatuslineUpdate() abort
  if !exists('g:StlSetPart') || !exists('g:StlRefresh')
    return
  endif
  let l:modes = {
        \ 'n': [' NORMAL ', 'DotModeNormal'],
        \ 'i': [' INSERT ', 'DotModeInsert'],
        \ 'v': [' VISUAL ', 'DotModeVisual'],
        \ 'V': [' V-LINE ', 'DotModeVisual'],
        \ nr2char(22): [' V-BLOCK ', 'DotModeVisual'],
        \ 'c': [' COMMAND ', 'DotModeCommand']}
  let l:current = get(l:modes, mode(), [' ' . &filetype . ' ', 'StatusLine'])
  call g:StlSetPart(0, l:current[0], l:current[1], 'mode')
  let l:name = empty(expand('%:t')) ? '[No Name]' : expand('%:t')
  call g:StlSetPart(10, ' ' . l:name . (&modified ? ' [+]' : ''), '', 'filename')
  try
    call g:StlSetPart(30, ' ' . bufferline#get_echo_string(), '', 'buffers')
  catch
  endtry
  call g:StlSetPart(max([0, &columns - 14]), printf(' %d:%d ', line('.'), virtcol('.')), '', 'position')
  call g:StlRefresh()
endfunction

augroup DotfilesUi
  autocmd!
  autocmd VimEnter * call theme#Init() | call <SID>StatuslineHighlights() | call <SID>StatuslineUpdate()
  autocmd ModeChanged,BufEnter,BufDelete,BufWritePost * call <SID>StatuslineUpdate()
  autocmd CursorHold * call <SID>StatuslineUpdate()
  autocmd ColorScheme * call <SID>StatuslineHighlights()
augroup END

nnoremap <silent> <leader>cbg :call theme#toggleBg()<CR>
nnoremap <silent> <leader>ctb :call theme#toggleTransparent()<CR>