-- Leader key
vim.g.mapleader = " "
vim.g.maplocalleader = "\\"

-- Enable relative line numbers
vim.opt.number = true
vim.opt.relativenumber = true

-- GUI stuff
vim.opt.cursorline = true       -- Highlight the current line
vim.opt.colorcolumn = "80,120"  -- Show vertical ruler
vim.opt.scrolloff = 8           -- Keep at least 8 lines between the cursor and the borders
vim.opt.wrap = false            -- Don't wrap long lines

-- Show whitespace characters (tabs, trailing spaces, etc.)
vim.opt.list = true
vim.opt.listchars = { tab = '» ', trail = '·', multispace = '·', nbsp = '␣' }

-- Strip trailing whitespace and extra blank lines at end of file on save
local trim_group = vim.api.nvim_create_augroup('TrimOnSave', { clear = true })
vim.api.nvim_create_autocmd('BufWritePre', {
    group = trim_group,
    pattern = '*',
    callback = function()
        local save_view = vim.fn.winsaveview()
        vim.cmd([[%s/\s\+$//e]])                -- Remove trailing whitespace on every line
        vim.cmd([[%s/\n\+\%$//e]])              -- Remove all trailing blank lines
        vim.fn.append(vim.fn.line('$'), '')     -- Always append exactly one blank line at the end
        vim.fn.setpos('.', save_cursor)         -- Restore the window to where it was before the edits
    end,
})

-- Remove background opacity
vim.api.nvim_set_hl(0, 'Normal', { bg = 'none' })
vim.api.nvim_set_hl(0, 'NormalFloat', { bg = 'none' })

-- Remember old sessions
vim.opt.undofile = true
local restore_cursor_group = vim.api.nvim_create_augroup('RestoreCursor', { clear = true })
vim.api.nvim_create_autocmd('BufReadPost', {
    group = restore_cursor_group,
    callback = function()
        local mark = vim.api.nvim_buf_get_mark(0, '"')
        local last_line = vim.api.nvim_buf_line_count(0)
        if mark[1] > 0 and mark[1] <= last_line then
            vim.schedule(function()
                vim.api.nvim_win_set_cursor(0, mark)
                vim.cmd.normal({ 'zz', bang = true })
            end)
        end
    end,
})

-- Indentation
vim.opt.tabstop = 4        -- Visual width of a tab character
vim.opt.softtabstop = 4    -- Spaces inserted/deleted per Tab/Backspace in insert mode
vim.opt.shiftwidth = 4     -- Width used by >>, <<, and autoindent
vim.opt.expandtab = true   -- Typed tabs become spaces
vim.opt.smartindent = true -- Auto-indent new lines based on syntax (e.g. after '{')

-- Search
vim.opt.ignorecase = true  -- Case-insensitive search...
vim.opt.smartcase = true   -- ...unless you type an explicit uppercase letter