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{-| Module describing an instance.

The instance data type holds very few fields, the algorithm

intelligence is in the "Node" and "Cluster" modules.

-}

module Ganeti.HTools.Instance where

data Instance = Instance { mem :: Int       -- ^ memory of the instance

                         , dsk :: Int       -- ^ disk size of instance

                         , running :: Bool  -- ^ whether the instance

                                            -- is running

                         , run_st :: String -- ^ original (text) run status

                         , pnode :: Int     -- ^ original primary node

                         , snode :: Int     -- ^ original secondary node

                         , idx :: Int       -- ^ internal index for

                                            -- book-keeping

                         } deriving (Show)

create :: Int -> Int -> String -> Int -> Int -> Instance

create mem_init dsk_init run_init pn sn =

    Instance {

          mem = mem_init,

          dsk = dsk_init,

          running = case run_init of

                      "running" -> True

                      "ERROR_up" -> True

                      _ -> False,

          run_st = run_init,

          pnode = pn,

          snode = sn,

          idx = -1

        }

-- | Changes the primary node of the instance.

setPri :: Instance  -- ^ the original instance

        -> Int      -- ^ the new primary node

        -> Instance -- ^ the modified instance

setPri t p = t { pnode = p }

-- | Changes the secondary node of the instance.

setSec :: Instance  -- ^ the original instance

        -> Int      -- ^ the new secondary node

        -> Instance -- ^ the modified instance

setSec t s = t { snode = s }

-- | Changes both nodes of the instance.

setBoth :: Instance  -- ^ the original instance

         -> Int      -- ^ new primary node index

         -> Int      -- ^ new secondary node index

         -> Instance -- ^ the modified instance

setBoth t p s = t { pnode = p, snode = s }

-- | Changes the index.

-- This is used only during the building of the data structures.

setIdx :: Instance  -- ^ the original instance

        -> Int      -- ^ new index

        -> Instance -- ^ the modified instance

setIdx t i = t { idx = i }