call plug#begin('~/.local/share/nvim/plugged')

" =============================================================================
" Key usability plugins
" =============================================================================

" FZF Fuzzy Search
Plug 'junegunn/fzf', { 'dir': '~/.fzf' }
Plug 'junegunn/fzf.vim'

" Floating terminal support for Neovim
Plug 'voldikss/vim-floaterm'

" Neovim LSP
Plug 'neovim/nvim-lspconfig'

" Treesitter
Plug 'nvim-treesitter/nvim-treesitter', {'do': ':TSUpdate'}

" Plenary - lua components used by other plugins
Plug 'nvim-lua/plenary.nvim'

" Completion
Plug 'hrsh7th/cmp-nvim-lsp' " Builtin LSP as a completion source
Plug 'hrsh7th/cmp-path'     " Support for path as a completion source
Plug 'hrsh7th/cmp-buffer'   " Support for loaded buffers as completion source
Plug 'hrsh7th/nvim-cmp'     " Primary plugin

" =============================================================================
" Languages and project type support.
" =============================================================================

" Janet Support
Plug 'janet-lang/janet.vim', { 'for': ['janet'] }

" Racket Support
Plug 'wlangstroth/vim-racket', { 'for': ['rkt'] }

" Generalized support for LISPs (Clojure, Racket, Janet)
Plug 'Olical/conjure', { 'tag': 'v4.25.0', 'for': ['janet'] }

" Zig Support
Plug 'ziglang/zig.vim', { 'for': ['zig'] }

" Scala Support
" Note: Metals should not be configured with the other LSP items.
Plug 'scalameta/nvim-metals', { 'for': ['scala', 'sbt'] }

" =============================================================================
" Visual enhancements
" =============================================================================

Plug 'sainnhe/gruvbox-material'
" Plug 'rebelot/kanagawa.nvim'

call plug#end()

" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

filetype plugin indent on
syntax on
let mapleader=","
let maplocalleader=","

" === Color Scheme === {{
set termguicolors
set background=dark
let g:gruvbox_material_palette = 'mix'
let g:gruvbox_material_background = 'hard'
let g:gruvbox_material_enable_bold = 1
colorscheme gruvbox-material
"colorscheme kanagawa

" === History and Undo Levels === {{
set history=512
set undolevels=128
set undofile
set undodir=~/.config/nvim/undo
" }}

" === Assorted Core Settings === {{
set noswapfile
set nocompatible
set modelines=0
set hidden            " Hide buffers
set encoding=utf-8    " Always use UTF-8 explicitly
set number            " Show line numbers by default
set cursorline        " Highlight the current line
set showcmd           " Display incomplete commands at the bottom
set noerrorbells      " ... we just don't like beeping
set visualbell        " Flash rather than beep
set t_vb=             " Don't flash please
set ttyfast           " Some optimizations for rendering
set ruler             " Show row and column number
set laststatus=2      " Last window has a status line
set showmatch         " Show matching parens
set lazyredraw        " redraw only when necessary, hopefully more efficient.
set pastetoggle=<F2>  " Cheap way to paste toggle
set colorcolumn=80    " Right margin display
set shortmess-=F      " Ensure audocmd works for filetype
set shortmess+=c      " Avoid showing extra message when using completion
set spelllang=en_us
" }}

" === Basic Completion Settings === {{
" menu = use a popup menu to show possible completions
" menuone = show a menu even if there is only one match
" noinsert = do not insert text for a match until user selects one
" noselect = do not select a match from the menu automatically
set completeopt=menu,menuone,noinsert,noselect
" }}

" === Indentation === {{
set tabstop=4
set shiftwidth=4
set softtabstop=4
set expandtab
set smarttab
set autoindent
" }}

" === Search Settings === {{
set ignorecase
set smartcase         
set incsearch
set showmatch
set hlsearch
" }}

" === General Ignores === {{
set wildignore=*.class,*.pyc,*.swp,*.o,*.jar
set wildignore+=*/tmp/*,*.zip,*.tar,*.gz,*.bz2,*.xz
set wildignore+=*/.git/*
set wildignore+=*/.metals/*,*/.bloop/*,*/.bsp/*
set wildignore+=*/node_modules/*
" }}

" === FZF Configuration === {{
let $FZF_DEFAULT_COMMAND='rg --files --no-messages "" .'
" }}

" === Key Mappings === {{

" Use Tab and Shift+Tab to navigate popup menus
inoremap <expr> <Tab>   pumvisible() ? "\<C-n>" : "\<Tab>"
inoremap <expr> <S-Tab> pumvisible() ? "\<C-p>" : "\<S-Tab>"

" Clear search highlighting
nmap <silent> <leader>/ :nohlsearch<CR>

" Save current buffer
nnoremap <leader>s :up<cr>

" Move to previous buffer
nnoremap <leader>bp :bp<cr>

" Move to next buffer
nnoremap <leader>bn :bn<cr>

" Delete current buffer
nnoremap <leader>bd :bd<cr>

" Press ; to show a list of active buffers (+ fuzzy search)
nmap ; :Buffers<CR>

" Press Ctrl+P to show a list of files (+ fuzzy search)
nmap <C-p> :Files<CR>

" Press <leader> + f to use ripgrep for search
nmap <leader>f :Rg<space>

" LSP key bindings
nnoremap <silent> K           <cmd>lua vim.lsp.buf.hover()<CR>
nnoremap <silent> gd          <cmd>lua vim.lsp.buf.definition()<CR>
nnoremap <silent> gi          <cmd>lua vim.lsp.buf.implementation()<CR>
nnoremap <silent> gr          <cmd>lua vim.lsp.buf.references()<CR>
nnoremap <silent> gds         <cmd>lua vim.lsp.buf.document_symbol()<CR>
nnoremap <silent> gws         <cmd>lua vim.lsp.buf.workspace_symbol()<CR>
nnoremap <silent> <leader>D   <cmd>lua vim.lsp.buf.type_definition()<CR>
nnoremap <silent> <leader>rn  <cmd>lua vim.lsp.buf.rename()<CR>
nnoremap <silent> <leader>ca  <cmd>lua vim.lsp.buf.code_action()<CR>
nnoremap <silent> <leader>q   <cmd>lua vim.lsp.diagnostic.set_loclist()<CR>
nnoremap <silent> <leader>e   <cmd>lua vim.lsp.diagnostic.open_float()<CR>
nnoremap <silent> [c          <cmd>lua vim.lsp.diagnostic.goto_prev { wrap = false }<CR>
nnoremap <silent> ]c          <cmd>lua vim.lsp.diagnostic.goto_next { wrap = false }<CR>

" Window movement
map <C-j> <C-w>j
map <C-k> <C-w>k
map <C-h> <C-w>h
map <C-l> <C-w>l
" }}

" === JSON Support === {{

" Properly handle comments in JSON.
autocmd FileType json syntax match Comment +\/\/.\+$+

" }}

" === netrw === {{
let g:netrw_banner = 0
let g:netrw_liststyle = 3
let g:netrw_browse_split = 4
let g:netrw_altv = 1
let g:netrw_winsize = 25
" }}

" === floaterm Configuration === {{
let g:floaterm_keymap_new    = '<leader>tc'
let g:floaterm_keymap_prev   = '<leader>tp'
let g:floaterm_keymap_next   = '<leader>tn'
let g:floaterm_keymap_toggle = '<leader>tt'
let g:floaterm_width = 0.8
let g:floaterm_height = 0.8
let g:floaterm_gitcommit = 'split'
" }}

" === nvim-cmp Configuration (Completion Plugin) === {{
lua << EOF
local cmp = require("cmp")
cmp.setup({
  sources = {
    { name = "nvim_lsp" },
    { name = "path" },
    { name = 'buffer', option = { keyword_length = 3 }, },
  },
  mapping = {
    ["<CR>"] = cmp.mapping.confirm({ 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,
  },
})
EOF
" }}

" === LSP Configuration === {{
lua << EOF
local lsp = require('lspconfig')

-- Use an on_attach function to configure after LSP attaches to buffer
local on_attach = function(client, bufnr)
  local function buf_set_option(...) vim.api.nvim_buf_set_option(bufnr, ...) end
  buf_set_option('omnifunc', 'v:lua.vim.lsp.omnifunc')
end

-- advertise the nvim-cmp capabilities to LSP servers
local capabilities = vim.lsp.protocol.make_client_capabilities()
capabilities = require('cmp_nvim_lsp').update_capabilities(capabilities)

lsp.zls.setup {
  on_attach = on_attach,
  flags = {
    debounce_text_changes = 150
  },
  capabilities = capabilities
}

-- Note that metals is totally separate.
-- It's also absurdly slow on a Raspberry Pi, it's only viable for somewhat
-- powerful machines (as is Scala dev in general).
metals_config = require("metals").bare_config()

metals_config.settings = {
  showImplicitArguments = true,
  serverVersion = "0.11.1",
}

metals_config.capabilities = capabilities

vim.cmd([[augroup lsp]])
vim.cmd([[autocmd!]])
vim.cmd([[autocmd FileType scala setlocal omnifunc=v:lua.vim.lsp.omnifunc]])
vim.cmd([[autocmd FileType java,scala,sbt lua require("metals").initialize_or_attach(metals_config)]])
vim.cmd([[augroup end]])
EOF
" }}

" === Treesitter Configuration === {{
lua <<EOF
require'nvim-treesitter.configs'.setup {
  -- One of "all", "maintained", or a list of languages
  ensure_installed = { "c", "zig", "bash", "scala" },

  -- Install languages synchronously (only applied to `ensure_installed`)
  sync_install = false,

  -- List of parsers to ignore installing
  ignore_install = { },

  highlight = {
    enable = true,
    disable = {},
    -- Setting this to true will run `:h syntax` and tree-sitter at the same 
    -- time. Set this to `true` if you depend on 'syntax' being enabled (like 
    -- for indentation). Using this option may slow down your editor, and you 
    -- may see some duplicate highlights. Instead of true it can also be a list 
    -- of languages
    additional_vim_regex_highlighting = false,
  },

  indent = {
    enable = true
  }
}
EOF
" }}