-- SETTINGS.LUA: Comprehensive Neovim Configuration

-- Enable line numbers
vim.o.number = true -- Show absolute line numbers
vim.o.relativenumber = true -- Show relative line numbers (useful for jump motions)

-- Cursor behavior
vim.o.cursorline = true -- Highlight the line where the cursor is
vim.o.cursorcolumn = true -- Highlight the column where the cursor is
vim.o.scrolloff = 8 -- Keep 8 lines visible above/below the cursor
vim.o.sidescrolloff = 8 -- Keep 8 columns visible to the left/right of the cursor

-- UI customization
vim.o.termguicolors = true -- Enable 24-bit RGB color in the terminal
vim.o.signcolumn = "yes" -- Always show the sign column (useful for LSP, Git)
vim.o.colorcolumn = "80" -- Highlight the 80th column (good for coding style guides)
vim.o.laststatus = 3 -- Global status line (shared between windows)
vim.o.showmode = false -- Disable the default mode display (e.g., -- INSERT --)
vim.o.wrap = false -- Disable line wrapping (horizontal scrolling for long lines)
vim.o.showcmd = true -- Display incomplete commands at the bottom
vim.o.ruler = true -- Show the cursor position at the bottom right

-- Tabs and indentation
vim.o.tabstop = 4 -- Number of spaces for a tab
vim.o.shiftwidth = 4 -- Number of spaces for indentation
vim.o.softtabstop = 4 -- Treat <Tab> as 4 spaces while editing
vim.o.expandtab = true -- Convert tabs to spaces
vim.o.autoindent = true -- Copy indentation from the previous line
vim.o.smartindent = true -- Automatically add extra indentation for new lines

-- Search settings
vim.o.ignorecase = true -- Ignore case when searching
vim.o.smartcase = true -- Override ignorecase if the search query contains uppercase
vim.o.incsearch = true -- Show incremental search results as you type
vim.o.hlsearch = true -- Highlight all matches from the search
vim.o.wildmenu = true -- Show a menu for command-line tab completion

-- File handling
vim.o.undofile = true -- Enable persistent undo (saves undo history in a file)
vim.o.swapfile = false -- Disable swap files (reduces disk writes)
vim.o.backup = false -- Disable file backups
vim.o.writebackup = false -- Disable backup before overwriting a file
vim.o.autoread = true -- Automatically reload files changed outside of Neovim
vim.o.hidden = true -- Allow switching buffers without saving

-- Split behavior
vim.o.splitright = true -- Open vertical splits to the right
vim.o.splitbelow = true -- Open horizontal splits below
vim.o.equalalways = false -- Prevent automatic resizing of splits

-- Clipboard
vim.o.clipboard = "unnamedplus" -- Use the system clipboard for all operations

-- Performance
vim.o.lazyredraw = true -- Redraw only when needed (improves performance)
vim.o.updatetime = 300 -- Time (ms) to trigger CursorHold events (lower = faster)
vim.o.timeoutlen = 500 -- Time (ms) to wait for a key sequence to complete

-- Completion
vim.o.completeopt = "menu,menuone,noselect" -- Customize the completion menu
vim.o.pumheight = 10 -- Limit the number of items in the popup menu

-- Folding
vim.o.foldmethod = "indent" -- Fold based on indentation levels
vim.o.foldlevel = 99 -- Start unfolded
vim.o.foldenable = true -- Enable folding by default

-- Backup directory (if enabled)
vim.o.backupdir = vim.fn.stdpath("data") .. "/backup//" -- Store backups in a custom directory

-- Mouse support
vim.o.mouse = "a" -- Enable mouse in all modes

-- Command-line
vim.o.cmdheight = 1 -- Height of the command-line area
vim.o.shortmess = vim.o.shortmess .. "c" -- Avoid showing extra messages during completion

-- Spell checking
vim.o.spell = false -- Disable spell checking by default
vim.o.spelllang = "en" -- Set spell check language to English

-- Wildmenu (command-line completion)
vim.o.wildignore = "*.o,*.obj,*.bak,*.exe,*.pyc,*.class" -- Ignore specific file types during file navigation
vim.o.wildmode = "longest:full,full" -- Customize command-line completion behavior

-- Terminal integration
vim.o.shell = "bash" -- Set the default shell
vim.o.shellcmdflag = "-c" -- Set shell command flag

-- Key mappings display
vim.o.showcmdloc = "statusline" -- Display key mappings in the status line

-- Diagnostics (LSP)
vim.diagnostic.config({
    virtual_text = true, -- Show diagnostics as virtual text
    signs = true, -- Show signs in the sign column
    underline = true, -- Underline problematic code
    update_in_insert = false, -- Don't update diagnostics while typing
})

-- Performance optimizations for large files
vim.cmd([[
  augroup LargeFiles
    autocmd!
    autocmd BufReadPre * if getfsize(expand("<afile>")) > 1048576 | setlocal syntax=off | endif
  augroup END
]])

-- Custom filetype settings
vim.cmd([[
  augroup FileTypeSpecific
    autocmd!
    autocmd FileType markdown setlocal wrap spell
    autocmd FileType python setlocal expandtab shiftwidth=4 tabstop=4
    autocmd FileType go setlocal noexpandtab tabstop=8 shiftwidth=8
  augroup END
]])