local M = {}

-- stylua: ignore start
M.setup = function()
  vim.g.mapleader = " "
  vim.g.maplocalleader = ","

  vim.cmd [[let &t_8f = "\<ESC>[38:2:%lu:%lu:%lum"]]
  vim.cmd [[let &t_8b = "\<ESC>[48:2:%lu:%lu:%lum"]]

  local o = vim.opt

  -- General
  o.belloff     = "all"           -- never ring bells
  o.hidden      = true            -- hide abandoned buffers
  o.clipboard   = "unnamedplus"   -- synchronize with system clipboard
  o.lazyredraw  = true            -- don"t redraw screen during macros
  o.modelines   = 0               -- never use modelines
  o.fileformats = "unix,mac,dos"  -- prioritize unix <EOL> format
  o.winblend    = 8               -- minimum transparency for floating windows

  o.swapfile    = false           -- don"t use swap files
  o.writebackup = true            -- Make a backup before writing a file...
  o.backup      = false           -- ...but don"t keep it around.
  o.undofile    = true            -- write undo history

  o.shortmess:append("I")         -- no intro message when starting Vim
  o.shada = {
    "'1000",    -- remember marks for this many files
    "/1000",    -- remember this many search patterns
    ":1000",    -- remember this many command line items
    "<100",     -- maximum number of lines to remember per register
    "h",        -- disable 'hlsearch' while reading shada file
    "s100",     -- limit size of remembered items to this many KiB
  }

  -- Searching
  o.ignorecase = true     -- Ignore case when searching...
  o.smartcase  = true     -- ...unless pattern contains uppercase characters.
  o.wrapscan   = false    -- Don't wrap around the end of the file when searching.

  -- Editing
  o.expandtab     = true     -- use spaces when <Tab> is inserted
  o.tabstop       = 4        -- tabs are 4 spaces
  o.shiftwidth    = 0        -- (auto)indent using 'tabstop' spaces
  o.smartindent   = true     -- use smart autoindenting
  o.inccommand    = "split"  -- preview command partial results
  o.joinspaces    = false    -- use one space after a period whe joining lines
  o.showmatch     = true     -- briefly jump to matching bracket if insert one
  o.virtualedit   = "block"  -- position the cursor anywhere in Visual Block mode
  o.formatlistpat = [[^\s*\(\d\+[\]:.)}\t ]\|[-+*]\|[\[(][ x][\])]\)\s*]]
  o.completeopt   = {
    "menu",       -- show completions in a popup menu
    "preview",    -- show extra information about the selected match
    "noinsert",   -- don"t insert text until I select a match
    "noselect",   -- don"t pre-select the first match in the menu
  }

  local fmt = o.formatoptions
  fmt:remove("t")  -- Don't auto-wrap on 'textwidth'...
  fmt:append("c")  -- ...but do it within comment blocks...
  fmt:append("l")  -- ...but not if line was already long before entering Insert mode.
  fmt:append("r")  -- Insert comment leader when pressing Enter...
  fmt:remove("o")  -- ...but not when opening a new line with o & O.
  fmt:append("q")  -- allow formatting of comments with gq
  fmt:remove("a")  -- don"t auto-format every time text is inserted
  fmt:append("n")  -- indent lists automatically acc. 'formatlistpat'
  fmt:append("j")  -- remove comment leader when joining lines
  fmt:append("1")  -- don"t break lines after a one letter word but rather before it

  -- Appearance
  o.termguicolors  = true    -- use "gui" :higlight instead of "cterm"
  o.showmode       = false   -- don't show mode (shown in statusline instead)
  o.relativenumber = true    -- Start off with relative line numbers...
  o.number         = true    -- ...but real number for current line.
  o.wrap           = false   -- don't wrap long lines initially
  o.textwidth      = 80      -- maximum width for text being inserted
  o.colorcolumn    = ""      -- highlight column after 'textwidth'
  o.cursorline     = true    -- highlight the line of the cursor
  o.showbreak      = "⤷ "    -- prefix for wrapped lines
  o.scrolloff      = 3       -- min. # of lines above and below cursor
  o.sidescrolloff  = 3       -- min. # of columns to left and right of cursor
  o.signcolumn     = "yes"   -- always display the signs column
  o.list           = false    -- don't show invisible characters initially
  o.listchars      = {
    eol = "↲",
    tab = "󰌒 ",     -- »
    extends = "…",
    precedes = "…",
    trail = "·",
    conceal = "┊",
  }
  o.fillchars = {
    diff = "⋅",
  }

  -- Wildcard Expansion
  o.wildignore = {
    ".git",
    ".svn",
    "__pycache__",
    "**/tmp/**",
    "*.DS_Store",
    "*.dll",
    "*.egg-info",
    "*.exe",
    "*.gif",
    "*.jpeg",
    "*.jpg",
    "*.o",
    "*.obj",
    "*.out",
    "*.png",
    "*.pyc",
    "*.so",
    "*.zip",
    "*~",
  }
  o.wildignorecase = true            -- ignore case when completing file names
  o.wildmode       = "longest:full"  -- longest common prefix first, then wildmenu

  -- Window Splitting
  o.splitbelow  = true               -- :split below current window
  o.splitright  = true               -- :vsplit to the right of current window
  o.equalalways = false              -- don't resize all windows when splitting

  -- Folding
  o.foldenable     = true            -- enable folding
  o.foldlevelstart = 100             -- start with all folds open
  o.foldmethod     = "syntax"        -- fold based on syntax by default
  o.foldnestmax    = 10              -- limit nested folds to 10 levels

  -- Options for diff mode
  o.diffopt = {     -- better side-by-side diffs
    "filler",       -- show filler lines (so text is vertically synced)
    "vertical",     -- use vertical splits (files side-by-side)
    "closeoff",     -- disable diff mode when one window is closed
  }
end
-- stylua: ignore end

return M