local M = {}

function M.load()
	M.files = {}
	local cwd = vim.fn.getcwd()
	M.hash = vim.fn.sha256(cwd)
	M.scratchdir = vim.fn.stdpath("data") .. "/scratch"
	if vim.fn.isdirectory(M.scratchdir) == 0 then
		vim.fn.mkdir(M.scratchdir, "p")
		return
	end
end

---Gets the name of the file that lives in the scratch directory
---@param ext string The file extension
---@return string
function M.getfile(ext)
	return M.scratchdir .. "/" .. M.hash .. "." .. ext
end

---Opens a buffer for the given file extension
---@param ext string?
function M.scratch(ext)
	if not ext then
		ext = vim.fn.expand("%:e")
	end
	-- open scratch for the ext
	local filename = M.getfile(ext)
	local buf = vim.api.nvim_create_buf(false, false)

	-- immediately move into floating window
	local width = math.floor(vim.o.columns * 0.8)
	local height = math.floor(vim.o.lines * 0.8)
	local row = math.floor((vim.o.lines - height) / 2)
	local col = math.floor((vim.o.columns - width) / 2)
	vim.api.nvim_open_win(buf, true, {
		relative = "editor",
		width = width,
		height = height,
		row = row,
		col = col,
		style = "minimal",
		border = "rounded",
		title = " " .. require("mini.icons").get("filetype", ext) .. " Scratchpad: " .. filename .. " ",
	})
	vim.cmd("edit " .. filename)

	-- mark hidden
	vim.bo[buf].bufhidden = "wipe"
	vim.bo[buf].buflisted = false

	-- easy close
	vim.keymap.set("n", "q", ":q<cr>", { buffer = buf, nowait = true })
	vim.keymap.set("n", "<C-c>", "<Esc>:q<cr>", { buffer = buf, nowait = true })

	-- execute on save
	vim.api.nvim_create_autocmd("BufWritePost", {
		buffer = buf,
		callback = function()
			vim.cmd("luafile %")
		end,
	})
end

return M