{-# LANGUAGE DeriveGeneric     #-}
{-# LANGUAGE LambdaCase        #-}
{-# LANGUAGE OverloadedStrings #-}

module HipChat.Types.Extensions where

import           Data.Aeson
import           Data.Aeson.Casing
import           Data.Aeson.Types
import           Data.Maybe
import           Data.Monoid
import           Data.Text              (Text)
import           GHC.Generics

import           HipChat.Types.Auth
import           HipChat.Types.Common
import           HipChat.Types.Dialog
import           HipChat.Types.Glance
import           HipChat.Types.WebPanel

data CapabilitiesAdminPage = CapabilitiesAdminPage
  { capUrl :: Text
  } deriving (Generic, Show)

instance ToJSON CapabilitiesAdminPage where
  toJSON = genericToJSON $ aesonPrefix snakeCase

instance FromJSON CapabilitiesAdminPage where
  parseJSON = genericParseJSON $ aesonPrefix snakeCase

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-- Installable

data Installable = Installable
  { -- | The URL to receive a confirmation of an integration installation. The message will be an HTTP POST with the
    --   following fields in a JSON-encoded body: 'capabilitiesUrl', 'oauthId', 'oauthSecret', and optionally 'roomId'.
    --   The installation of the integration will only succeed if the POST response is a 200.
    installableCallbackUrl :: Maybe Text
  , installableAllowRoom   :: Bool
  , installableAllowGlobal :: Bool
  } deriving (Show, Eq)

instance ToJSON Installable where
  toJSON (Installable cb r g) = object $ catMaybes
    [ ("callbackUrl" .=) <$> cb
    ] <>
    [ "allowRoom" .= r
    , "allowGlobal" .= g
    ]

instance FromJSON Installable where
  parseJSON = withObject "object" $ \o -> Installable
    <$> o .:? "callbackUrl"
    <*> o .:? "allowRoom" .!= True
    <*> o .:? "allowGlobal" .!= True

defaultInstallable :: Installable
defaultInstallable = Installable Nothing True True

--------------------------------------------------------------------------------

-- Capabilities

data Capabilities = Capabilities
  { capabilitiesInstallable        :: Maybe Installable
  , capabilitiesHipchatApiConsumer :: Maybe APIConsumer
  , capabilitiesOauth2Provider     :: Maybe OAuth2Provider
  , capabilitiesWebhooks           :: [Webhook]
  , capabilitiesConfigurable       :: Maybe Configurable
  , capabilitiesDialog             :: [Dialog]
  , capabilitiesWebPanel           :: [WebPanel]
  , capabilitiesGlance             :: [Glance]
  } deriving (Show, Eq)

defaultCapabilities :: Capabilities
defaultCapabilities = Capabilities Nothing Nothing Nothing [] Nothing [] [] []

instance ToJSON Capabilities where
  toJSON (Capabilities is con o hs cfg dlg wp gl) = object $ catMaybes
    [ ("installable" .=) <$> is
    , ("hipchatApiConsumer" .=) <$> con
    , ("oauth2Provider" .=) <$> o
    , ("webhook" .=) <$> excludeEmptyList hs
    , ("configurable" .=) <$> cfg
    , ("dialog" .=) <$> excludeEmptyList dlg
    , ("webPanel" .=) <$> excludeEmptyList wp
    , ("glance" .=) <$> excludeEmptyList gl
    ]

excludeEmptyList :: [a] -> Maybe [a]
excludeEmptyList [] = Nothing
excludeEmptyList xs = Just xs

instance FromJSON Capabilities where
  parseJSON = withObject "object" $ \o -> Capabilities
    <$> o .:? "installable"
    <*> o .:? "hipchatApiConsumer"
    <*> o .:? "oauth2Provider"
    <*> o .:? "webhooks" .!= []
    <*> o .:? "configurable"
    <*> o .:? "dialog" .!= []
    <*> o .:? "webpanel" .!= []
    <*> o .:? "glance" .!= []



--------------------------------------------------------------------------------


data CapabilitiesLinks = CapabilitiesLinks
  { clHomepage :: Maybe Text
  , clSelf     :: Text
  } deriving (Generic, Eq, Show)

defaultCapabilitiesLinks :: Text -> CapabilitiesLinks
defaultCapabilitiesLinks = CapabilitiesLinks Nothing

instance ToJSON CapabilitiesLinks where
  toJSON = genericToJSON (aesonPrefix camelCase){omitNothingFields = True}

instance FromJSON CapabilitiesLinks where
  parseJSON = genericParseJSON $ aesonPrefix camelCase

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-- Vendor

data Vendor = Vendor
  { vendorUrl  :: Text
  , vendorName :: Text
  } deriving (Generic, Show, Eq)

instance ToJSON Vendor where
  toJSON = genericToJSON $ aesonPrefix camelCase

instance FromJSON Vendor where
  parseJSON = genericParseJSON $ aesonPrefix camelCase

--------------------------------------------------------------------------------

data CapabilitiesDescriptor = CapabilitiesDescriptor
  { capabilitiesDescriptorApiVersion   :: Maybe Text
  , capabilitiesDescriptorCapabilities :: Maybe Capabilities
  , capabilitiesDescriptorDescription  :: Text
  , capabilitiesDescriptorKey          :: Text
  , capabilitiesDescriptorLinks        :: CapabilitiesLinks
  , capabilitiesDescriptorName         :: Text
  , capabilitiesDescriptorVendor       :: Maybe Vendor
  } deriving (Generic, Show)

capabilitiesDescriptor :: Text -> Text -> CapabilitiesLinks -> Text -> CapabilitiesDescriptor
capabilitiesDescriptor desc key links name = CapabilitiesDescriptor Nothing Nothing desc key links name Nothing

instance ToJSON CapabilitiesDescriptor where
  toJSON = genericToJSON (aesonDrop 22 camelCase){omitNothingFields = True}

instance FromJSON CapabilitiesDescriptor where
  parseJSON = genericParseJSON $ aesonDrop 22 camelCase

--------------------------------------------------------------------------------

data Webhook = Webhook
  { webhookUrl     :: Text
  , webhookPattern :: Maybe Text
  , webhookEvent   :: RoomEvent
  } deriving (Generic, Show, Eq)

instance ToJSON Webhook where
  toJSON = genericToJSON $ aesonPrefix camelCase

instance FromJSON Webhook where
  parseJSON = genericParseJSON $ aesonPrefix camelCase

webhook :: Text -> RoomEvent -> Webhook
webhook url = Webhook url Nothing

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data OAuth2Provider = OAuth2Provider
  { oauth2ProviderAuthorizationUrl :: Text
  , oauth2ProviderTokenUrl         :: Text
  } deriving (Generic, Show, Eq)

instance ToJSON OAuth2Provider where
  toJSON = genericToJSON $ aesonPrefix camelCase

instance FromJSON OAuth2Provider where
  parseJSON = genericParseJSON $ aesonDrop 14 camelCase

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data Configurable = Configurable
  { configurableUrl :: Text
  } deriving (Generic, Show, Eq)

instance ToJSON Configurable where
  toJSON = genericToJSON $ aesonPrefix camelCase

instance FromJSON Configurable where
  parseJSON = genericParseJSON $ aesonPrefix camelCase

--------------------------------------------------------------------------------

data Registration = Registration
  { registrationOauthId         :: Text
  , registrationCapabilitiesUrl :: Text
  , registrationRoomId          :: Maybe Int
  , registrationGroupId         :: Int
  , registrationOauthSecret     :: Text
  } deriving (Generic, Show, Eq, Ord)

instance FromJSON Registration where
  parseJSON = genericParseJSON $ aesonPrefix camelCase

--------------------------------------------------------------------------------

data AddOn = AddOn
  { addOnKey          :: Text
  , addOnName         :: Text
  , addOnDescription  :: Text
  , addOnLinks        :: CapabilitiesLinks
  , addOnCapabilities :: Maybe Capabilities
  , addOnVendor       :: Maybe Vendor
  } deriving (Generic, Show, Eq)

defaultAddOn
  :: Text -- ^ key
  -> Text -- ^ name
  -> Text -- ^ description
  -> CapabilitiesLinks
  -> AddOn
defaultAddOn k n d ls = AddOn k n d ls Nothing Nothing

--------------------------------------------------------------------------------