local fs = {}
local disks = {}
local mounts = {}

local function resolve(path)
    local mountPoint = "/"
    for mount, disk in pairs(mounts) do
        if path:sub(1, #mount) == mount then
            if not mountPoint or #mount > #mountPoint then
                mountPoint = mount
            end
        end
    end
    local newPath = path:sub(#mountPoint + 1)
    return disks[mounts[mountPoint]], newPath
end
---------------------------------------------------------

function fs.update(initdisks)
    disks = {}
    for k, v in initdisks.list() do
        disks[k] = v
    end
end

function fs.exists(path)
    local disk, newPath = resolve(path)
    return disk:directoryExists(newPath) or disk:fileExists(newPath)
end
function fs.isFile(path)
    local disk, newPath = resolve(path)
    return disk:fileExists(newPath)
end
function fs.isDir(path)
    local disk, newPath = resolve(path)
    return disk:directoryExists(newPath)
end
function fs.list(path)
    local disk, newPath = resolve(path)
    return disk:list(newPath)
end
function fs.makeDir(path)
    local disk, newPath = resolve(path)
    return disk:makeDirectory(newPath)
end
function fs.remove(path)
    local disk, newPath = resolve(path)
    return disk:remove(newPath)
end
function fs.readAllText(path)
    local disk, newPath = resolve(path)
    local handle = disk:open(newPath, "r")
    if not handle then return nil end
    local content = handle.readAll()
    handle.close()
    return content
end
function fs.writeAllText(path, text)
    local disk, newPath = resolve(path)
    local handle = disk:open(newPath, "w")
    handle.write(text)
    handle.close()
end
function fs.appendAllText(path, text)
    local disk, newPath = resolve(path)
    local handle = disk:open(newPath, "a")
    handle.write(text)
    handle.close()
end
function fs.load(path)
    return load(fs.readAllText(path), path)
end
function fs.mount(disk, mountPoint)
    if not disks[disk] then return end
    mounts[mountPoint] = disk
end
return fs