local path = {}

path.sep = package.config:sub(1, 1)
path.is_windows = path.sep == "\\"

local function normalize(p)
	local out = p:gsub("\\", "/")
	out = out:gsub("/+", "/")
	if path.is_windows then
		out = out:gsub("/", "\\")
	end
	return out
end

function path.join(...)
	local parts = {...}
	local out = ""
	for _, part in ipairs(parts) do
		part = tostring(part)
		if part ~= "" then
			if out == "" then
				out = part
			else
				out = out .. "/" .. part
			end
		end
	end
	return normalize(out)
end

function path.dirname(p)
	p = tostring(p):gsub("\\", "/")
	local d = p:match("^(.*)/[^/]*$")
	if d == nil or d == "" then return "." end
	return normalize(d)
end

function path.basename(p)
	p = tostring(p):gsub("\\", "/")
	return p:match("([^/]+)$") or p
end

function path.exists(p)
	local f = io.open(p, "rb")
	if f then f:close(); return true end
	return false
end

function path.read_file(p)
	local f = assert(io.open(p, "rb"))
	local data = f:read("*a")
	f:close()
	return data
end

function path.write_file(p, data)
	local f = assert(io.open(p, "wb"))
	f:write(data)
	f:close()
end

function path.remove_file(p)
	if not p or p == "" then return end
	os.remove(p)
end

function path.shell_quote(s)
	s = tostring(s)
	if path.is_windows then
		return '"' .. s:gsub('"', '\\"') .. '"'
	end
	return "'" .. s:gsub("'", "'\\''") .. "'"
end

function path.repo_root(script_path)
	local tools_dir = path.dirname(script_path or arg[0] or "tools/test.lua")
	local root = path.dirname(tools_dir)
	if path.exists(path.join(root, "gpu.odin")) then
		return root
	end
	return "."
end

function path.mkdir_p(dir)
	local cmd
	if path.is_windows then
		cmd = "if not exist " .. path.shell_quote(dir) .. " mkdir " .. path.shell_quote(dir)
	else
		cmd = "mkdir -p " .. path.shell_quote(dir)
	end
	return os.execute(cmd)
end

return path