" ~/.vimrc — Vim 9 configuration
" Requires: vim-plug, rust-analyzer in PATH, fzf binary

let mapleader = ' '

" ── Bootstrap vim-plug ────────────────────────────────────────────────────────
let s:plug_path = expand('~/.vim/autoload/plug.vim')
if !filereadable(s:plug_path)
  silent execute '!curl -fLo ' .. s:plug_path .. ' --create-dirs '
    \ .. 'https://raw.githubusercontent.com/junegunn/vim-plug/master/plug.vim'
  autocmd VimEnter * PlugInstall --sync | source $MYVIMRC
endif

" ── Plugins ───────────────────────────────────────────────────────────────────
call plug#begin()

Plug 'yegappan/lsp'
Plug 'junegunn/fzf', { 'do': { -> fzf#install() } }
Plug 'junegunn/fzf.vim'
Plug 'ghifarit53/tokyonight-vim'
Plug 'vim-airline/vim-airline'
Plug 'vim-airline/vim-airline-themes'

call plug#end()

" ── General settings ──────────────────────────────────────────────────────────
filetype plugin indent on
syntax enable

set number           " show line numbers
set signcolumn=yes   " always show sign column; prevents layout shift from LSP diagnostics
set updatetime=300   " ms before swap write / CursorHold fires; speeds up LSP diagnostics
set hidden           " allow switching away from a modified buffer without saving

set tabstop=4        " <Tab> displays as 4 spaces
set shiftwidth=4     " >> / << indent by 4 spaces
set softtabstop=4    " <Tab> in insert mode inserts/deletes 4 spaces
set expandtab        " insert spaces instead of tab characters

set ignorecase       " case-insensitive search by default
set smartcase        " override ignorecase when pattern contains uppercase
set incsearch        " highlight matches while typing search pattern
set hlsearch         " highlight all matches after search

set splitbelow       " :split opens new window below
set splitright       " :vsplit opens new window to the right
set scrolloff=8      " keep 8 lines of context above/below cursor when scrolling

set clipboard=unnamedplus  " yank/put use the system clipboard automatically
set mouse=a                " enable mouse support in all modes

" ── File clutter ───────────────────────────────────────────────────────────────
set nobackup
set nowritebackup
let &directory = expand('~/.vim/swap//')
silent! call mkdir(expand('~/.vim/swap'), 'p', 0700)
set undofile
let &undodir = expand('~/.vim/undo//')
silent! call mkdir(expand('~/.vim/undo'), 'p', 0700)

" ── Colors ────────────────────────────────────────────────────────────────────
set termguicolors
let g:tokyonight_style = 'night'
colorscheme tokyonight

" ── LSP (yegappan/lsp) ────────────────────────────────────────────────────────
def g:LspOnSetup()
  var lspServers = [
    {
      name: 'rust',
      filetype: ['rust'],
      path: 'rust-analyzer',
      syncInit: true,
    }
  ]
  g:LspAddServer(lspServers)
enddef

augroup MyLsp
  autocmd!
  autocmd User LspSetup call g:LspOnSetup()
  autocmd FileType rust {
    nnoremap <buffer> gd        <Cmd>LspGotoDefinition<CR>
    nnoremap <buffer> gD        <Cmd>LspGotoDeclaration<CR>
    nnoremap <buffer> gi        <Cmd>LspGotoImpl<CR>
    nnoremap <buffer> gr        <Cmd>LspShowReferences<CR>
    nnoremap <buffer> gy        <Cmd>LspGotoTypeDef<CR>
    nnoremap <buffer> K         <Cmd>LspHover<CR>
    nnoremap <buffer> <leader>lr <Cmd>LspRename<CR>
    nnoremap <buffer> <leader>la <Cmd>LspCodeAction<CR>
    nnoremap <buffer> <leader>lf <Cmd>LspFormat<CR>
    nnoremap <buffer> <leader>ld <Cmd>LspDiagShow<CR>
    nnoremap <buffer> [d         <Cmd>LspDiagPrev<CR>
    nnoremap <buffer> ]d         <Cmd>LspDiagNext<CR>
    nnoremap <buffer> <leader>lo <Cmd>LspOutline<CR>
    nnoremap <buffer> <leader>li <Cmd>LspInlayHints toggle<CR>
  }
augroup END

" ── Search ────────────────────────────────────────────────────────────────────
nnoremap <Esc> <Cmd>nohlsearch<CR>

" ── Window navigation ──────────────────────────────────────────────────────────
nnoremap <C-h> <C-w>h
nnoremap <C-j> <C-w>j
nnoremap <C-k> <C-w>k
nnoremap <C-l> <C-w>l

" ── Airline ───────────────────────────────────────────────────────────────────
let g:airline_theme = 'tokyonight'
let g:airline_powerline_fonts = 0           " set to 1 if you have a Nerd Font
let g:airline#extensions#lsp#enabled = 1

" ── FZF ───────────────────────────────────────────────────────────────────────
" Use ripgrep for :Files if available
if executable('rg')
  set grepprg=rg\ --vimgrep\ --smart-case
  set grepformat=%f:%l:%c:%m
endif

" Layout
let g:fzf_layout = { 'down': '40%' }
let g:fzf_preview_window = ['right:50%:hidden', 'ctrl-/']

" FZF keymaps
nnoremap <C-p>      <Cmd>Files<CR>
nnoremap <C-b>      <Cmd>Buffers<CR>
nnoremap <leader>rg <Cmd>Rg<CR>
nnoremap <leader>fg <Cmd>GFiles<CR>
nnoremap <leader>fl <Cmd>BLines<CR>
nnoremap <leader>fh <Cmd>History<CR>
nnoremap <leader>fc <Cmd>Commands<CR>
nnoremap <leader>fm <Cmd>Maps<CR>

" Word search under cursor
nnoremap <leader>fw <Cmd>execute 'Rg ' .. expand('<cword>')<CR>