local M = {}
local header_regex = "^(#+) (.+)"

M.promote = function()
	if vim.api.nvim_get_mode().mode == "n" then
		local current_line = vim.api.nvim_get_current_line()
		local row, col = unpack(vim.api.nvim_win_get_cursor(0))
		local new_line = ""

		if current_line:match(header_regex) then
			if current_line:match("^# (.+)") then
				vim.notify("You can't promote this header anymore")
				return
			end
			new_line = current_line:gsub("^#", "", 1)
			vim.api.nvim_buf_set_lines(0, row - 1, row, true, { new_line })
		end
	end
end

M.demote = function()
	if vim.api.nvim_get_mode().mode == "n" then
		local current_line = vim.api.nvim_get_current_line()
		local row, col = unpack(vim.api.nvim_win_get_cursor(0))
		local new_line = ""

		if current_line:match(header_regex) then
			if current_line:match("^###### (.+)") then
				vim.notify("You can't demote this header anymore")
				return
			end
			new_line = current_line:gsub("^#", "##", 1)
			vim.api.nvim_buf_set_lines(0, row - 1, row, true, { new_line })
		end
	end
end

return M