module IptAdmin.EditPage where

import Control.Monad.Error
import Control.Monad.State
import Happstack.Server.SimpleHTTP
import IptAdmin.EditForm
import IptAdmin.EditForm.Class
import IptAdmin.EditForm.Render
import IptAdmin.EditForm.Utils
import IptAdmin.Render
import IptAdmin.System
import IptAdmin.Types
import IptAdmin.Utils
import Iptables
import Iptables.Print
import Iptables.Types
import Safe
import Text.Blaze.Renderer.Pretty (renderHtml)

pageHandlers :: IptAdmin Response
pageHandlers = msum [ methodSP GET pageHandlerGet
                    , methodSP POST pageHandlerPost
                    ]

pageHandlerGet :: IptAdmin Response
pageHandlerGet = do
    tableName <- getInputNonEmptyString "table"
    chainName <- getInputNonEmptyString "chain"
    rulePosition <- getInputRead "pos"

    (table, _, rule) <- checkParams tableName chainName rulePosition

    (PackedEditForm formParams) <- ruleToSelForm rule tableName chainName

    let userChainNames = getUserChains formParams chainName table

    return $ buildResponse $ renderHtml $
        editFormHtml (tableName, chainName, rulePosition, userChainNames) formParams Nothing

pageHandlerPost :: IptAdmin Response
pageHandlerPost = do
    tableName <- getInputNonEmptyString "table"
    chainName <- getInputNonEmptyString "chain"
    rulePosition <- getInputRead "rulePos"

    (table, _, _) <- checkParams tableName chainName rulePosition

    (PackedEditForm addFormParams) <- httpInputToSelForm tableName chainName
    let userChainNames = getUserChains addFormParams chainName table

    let checkResE = editPageProcessParams addFormParams
    case checkResE of
        Left formResp -> return $ buildResponse $ renderHtml $ do
            editFormHtml (tableName, chainName, rulePosition, userChainNames) addFormParams $ Just formResp
        Right (opts, tar, formResp) -> do
            let (_, opts') = runState (mapM_ completeModules opts) opts
            let rule = Rule (Counters 0 0) opts' tar

            submit <- getInputString "submit"
            case submit of
                "Check" -> return $ buildResponse $ renderHtml (do
                    editFormHtml (tableName, chainName, rulePosition, userChainNames) addFormParams $ Just formResp
                    ) -- ++ printRuleForRun rule
                "Submit" -> do
                    tryChange (replaceRule tableName chainName rulePosition rule)
                    -- redir $ "/show?table=" ++ tableName ++ bookmarkForJump chainName (Just rulePosition)
                    return $ buildResponse "ok"
                a -> throwError $ "Invalid value for 'submit' parameter: " ++ a

checkParams :: String -> String -> Int -> IptAdmin ([Chain], Chain, Rule)
checkParams tableName chainName rulePosition = do
    table <- getTable tableName

    let chainMay = getChainByName chainName table
    chain <- maybe (throwError $ "Invalid chain name: " ++ chainName)
                   return
                   chainMay

    let ruleMay = cRules chain `atMay` (rulePosition - 1)
    rule <- maybe (throwError $ "Rule index out of range: " ++ show rulePosition)
                  return
                  ruleMay
    return (table, chain, rule)