commit 3619e9390b2f0df2bfa2a56f584aaa6e58cba06b
Author: Akshay Mankar <itsakshaymankar@gmail.com>
Date:   Wed Oct 25 00:15:11 2023 +0200

    Scrape and send to 1 chat

diff --git a/berlin-scraper/CHANGELOG.md b/berlin-scraper/CHANGELOG.md
new file mode 100644
index 0000000..7641c1e
--- /dev/null
+++ b/berlin-scraper/CHANGELOG.md
@@ -0,0 +1,5 @@
+# Revision history for berlin-scraper
+
+## 0.1.0.0 -- YYYY-mm-dd
+
+* First version. Released on an unsuspecting world.
diff --git a/berlin-scraper/LICENSE b/berlin-scraper/LICENSE
new file mode 100644
index 0000000..dba13ed
--- /dev/null
+++ b/berlin-scraper/LICENSE
@@ -0,0 +1,661 @@
+                    GNU AFFERO GENERAL PUBLIC LICENSE
+                       Version 3, 19 November 2007
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+  15. Disclaimer of Warranty.
+
+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Affero General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU Affero General Public License for more details.
+
+    You should have received a copy of the GNU Affero General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If your software can interact with users remotely through a computer
+network, you should also make sure that it provides a way for users to
+get its source.  For example, if your program is a web application, its
+interface could display a "Source" link that leads users to an archive
+of the code.  There are many ways you could offer source, and different
+solutions will be better for different programs; see section 13 for the
+specific requirements.
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU AGPL, see
+<http://www.gnu.org/licenses/>.
diff --git a/berlin-scraper/app/Main.hs b/berlin-scraper/app/Main.hs
new file mode 100644
index 0000000..6d6f66d
--- /dev/null
+++ b/berlin-scraper/app/Main.hs
@@ -0,0 +1,235 @@
+{-# LANGUAGE BlockArguments #-}
+{-# LANGUAGE DataKinds #-}
+{-# LANGUAGE LambdaCase #-}
+{-# LANGUAGE OverloadedRecordDot #-}
+{-# LANGUAGE OverloadedStrings #-}
+{-# LANGUAGE RecordWildCards #-}
+
+module Main where
+
+import Control.Lens (view)
+import Control.Monad (when)
+import Control.Monad.IO.Class
+import Data.Aeson hiding (Options)
+import Data.Aeson qualified as Aeson
+import Data.ByteString.Lazy qualified as LBS
+import Data.Maybe (fromJust, fromMaybe, listToMaybe)
+import Data.Text qualified as Text
+import Data.Text.Encoding qualified as Text
+import Data.Text.IO qualified as Text
+import Database.SQLite.Simple
+import GHC.Generics
+import Network.Wreq hiding (Options)
+import Options.Generic
+import System.Exit (exitFailure)
+import Telegram.Bot.API
+import Telegram.Bot.Simple
+import Telegram.Bot.Simple.Debug
+import Text.HTML.Scalpel
+
+main :: IO ()
+main = do
+  opts <- unwrapRecord "Berlin Scrapper"
+  token <- getEnvToken "TELEGRAM_BOT_TOKEN"
+  clientEnv <- defaultTelegramClientEnv token
+  startBot (traceBotDefault $ botApp opts) clientEnv >>= \case
+    Left err -> do
+      putStrLn $ "Bot failed with: " <> show err
+      exitFailure
+    _ -> pure ()
+
+-- * Types
+
+newtype Options w = Options {dbFile :: w ::: FilePath <?> "Path to the sqlite database"}
+  deriving (Generic)
+
+instance ParseRecord (Options Wrapped)
+
+data Offer = Offer
+  { id_ :: Text,
+    title :: Text,
+    address :: Maybe Text,
+    rooms :: Maybe Double,
+    area :: Maybe Double,
+    availableFrom :: Maybe Text,
+    link :: Text
+  }
+  deriving (Show, Generic)
+
+instance FromRow Offer
+
+instance ToRow Offer
+
+data IBWResponse = IBWResponse
+  { headline :: Text,
+    searchresults :: Text
+  }
+  deriving (Generic)
+
+instance FromJSON IBWResponse
+
+-- * Parsing
+
+queryIBW :: IO IBWResponse
+queryIBW = do
+  let reqBody =
+        [ partText "q" "wf-save-srch",
+          partText "save" "false",
+          partText "heizung_zentral" "false",
+          partText "heizung_etage" "false",
+          partText "energy_fernwaerme" "false",
+          partText "heizung_nachtstrom" "false",
+          partText "heizung_ofen" "false",
+          partText "heizung_gas" "false",
+          partText "heizung_oel" "false",
+          partText "heizung_solar" "false",
+          partText "heizung_erdwaerme" "false",
+          partText "heizung_fussboden" "false",
+          partText "seniorenwohnung" "false",
+          partText "maisonette" "false",
+          partText "etagen_dg" "false",
+          partText "balkon_loggia_terrasse" "false",
+          partText "garten" "false",
+          partText "wbs" "0",
+          partText "barrierefrei" "false",
+          partText "gaeste_wc" "false",
+          partText "aufzug" "false",
+          partText "stellplatz" "false",
+          partText "keller" "false",
+          partText "badewanne" "false",
+          partText "dusche" "false",
+          partText "bez[]" "01_00",
+          partText "bez[]" "02_00",
+          partText "bez[]" "04_00",
+          partText "bez[]" "07_00",
+          partText "bez[]" "08_00",
+          partText "bez[]" "09_00",
+          partText "bez[]" "11_00"
+        ]
+  let link = "https://inberlinwohnen.de/wp-content/themes/ibw/skript/wohnungsfinder.php"
+  resBS <- view responseBody <$> post link reqBody
+  pure $ fromJust $ decode @IBWResponse resBS
+
+scrapeOffers :: Scraper Text [Offer]
+scrapeOffers = do
+  let listItemsSelector = "div" @: [hasClass "result-list"] // "ul" // "li"
+  chroots listItemsSelector scrapeOffer
+
+scrapeOffer :: Scraper Text Offer
+scrapeOffer = do
+  title <- Text.strip <$> text "h3"
+
+  let tableSelector = "div" @: [hasClass "tb-merkdetails"] // "div" @: [hasClass "span_wflist_data"] // "table" @: [hasClass "fullw"] // "tbody"
+      rowsSelector = tableSelector // "tr"
+      tableDataParser = do
+        thVal <- text "th"
+        (Text.strip thVal,) <$> text "td"
+  allTableData <- chroots rowsSelector tableDataParser
+  let address = lookup "Adresse:" allTableData
+      roomsStr = lookup "Zimmeranzahl:" allTableData
+      rooms = readEuropeanNumber <$> roomsStr
+      areaStr = lookup "Wohnfläche:" allTableData
+      area = readEuropeanNumber <$> (Text.stripSuffix " m²" =<< areaStr)
+      availableFrom = lookup "Bezugsfertig ab:" allTableData
+
+  link <- attr "href" $ "a" @: [hasClass "org-but"]
+  id_ <- attr "id" "li"
+  pure Offer {..}
+
+readEuropeanNumber :: Text -> Double
+readEuropeanNumber x = do
+  read $ Text.unpack $ Text.replace "," "." x
+
+-- * SQLite
+
+insertOffer :: Connection -> Offer -> IO ()
+insertOffer conn =
+  execute conn "INSERT INTO offers (id, title, address, rooms, area, availableFrom, link) VALUES (?, ?, ?, ?, ?, ?, ?)"
+
+getOffer :: Connection -> Text -> IO (Maybe Offer)
+getOffer conn offerId =
+  listToMaybe <$> query conn "SELECT * from offers where id = ?" (Only offerId)
+
+createTable :: Connection -> IO ()
+createTable conn =
+  execute_ conn "CREATE TABLE IF NOT EXISTS offers (id TEXT PRIMARY KEY, title TEXT, address TEXT, rooms REAL, area REAL, availableFrom TEXT, link TEXT)"
+
+saveOffer :: Connection -> Offer -> IO Bool
+saveOffer conn offer = do
+  getOffer conn offer.id_ >>= \case
+    Nothing -> do
+      insertOffer conn offer
+      pure True
+    _ -> pure False
+
+-- * Telegram
+
+type Model = ()
+
+newtype Action = StartChat Chat
+  deriving (Show)
+
+botApp :: Options Unwrapped -> BotApp Model Action
+botApp opts =
+  BotApp
+    { botInitialModel = (),
+      botAction = action,
+      botHandler = handler,
+      botJobs = [scrapeJob opts]
+    }
+
+action :: Update -> Model -> Maybe Action
+action update _ = do
+  msg <- update.updateMessage
+  txt <- msg.messageText
+  if txt == "/start"
+    then pure $ StartChat msg.messageChat
+    else Nothing
+
+handler :: Action -> Model -> Eff Action Model
+handler (StartChat chat) model =
+  model <# do
+    liftIO $ putStrLn $ "Chat started! " <> ppAsJSON chat
+
+scrapeJob :: Options Unwrapped -> BotJob Model Action
+scrapeJob opts =
+  BotJob
+    { botJobSchedule = "* * * * *",
+      botJobTask = scrapeJobTask opts
+    }
+
+scrapeJobTask :: Options Unwrapped -> Model -> Eff Action Model
+scrapeJobTask opts m =
+  m <# do
+    liftIO $ putStrLn "Starting scrape job"
+    res <- liftIO queryIBW
+    let offers = fromJust $ scrapeStringLike res.searchresults scrapeOffers
+    liftIO $ putStrLn "Fetched offers"
+    conn <- liftIO $ open (dbFile opts)
+    liftIO $ createTable conn
+    mapM_
+      ( \offer -> do
+          isNewOffer <- liftIO $ saveOffer conn offer
+          when isNewOffer $ do
+            liftIO $ putStrLn "Found a new offer"
+            notify offer
+      )
+      offers
+
+notify :: Offer -> BotM ()
+notify offer = do
+  let offerTitle = "<b><u>" <> offer.title <> "</u></b>"
+      offerAddress = "<b>Address:</b> " <> fromMaybe "N/A" offer.address
+      offerRooms = "<b>Rooms:</b> " <> maybe "N/A" (Text.pack . show) offer.rooms
+      offerArea = "<b>Area:</b> " <> maybe "N/A" ((<> " m²") . Text.pack . show) offer.area
+      offerLink = "<a href=\"https://inberlinwohnen.de" <> offer.link <> "\" >Apply Here</a>"
+      offerBody = offerAddress <> "\n" <> offerRooms <> "\n" <> offerArea <> "\n" <> offerLink
+      offerText = offerTitle <> "\n\n" <> offerBody
+      sendMsgReq = (defSendMessage (SomeChatId $ ChatId 952512153) offerText) {sendMessageParseMode = Just HTML}
+  res <- runTG sendMsgReq
+  liftIO $
+    if res.responseOk
+      then putStrLn "Notified successfully"
+      else do
+        putStrLn $ "Failed to notify the offer: " <> show offer
+        Text.putStrLn $ "Response: " <> Text.decodeUtf8 (LBS.toStrict $ Aeson.encode res)
diff --git a/berlin-scraper/berlin-scraper.cabal b/berlin-scraper/berlin-scraper.cabal
new file mode 100644
index 0000000..2f51f60
--- /dev/null
+++ b/berlin-scraper/berlin-scraper.cabal
@@ -0,0 +1,30 @@
+cabal-version:      3.0
+name:               berlin-scraper
+version:            0.1.0.0
+license:            AGPL-3.0-or-later
+license-file:       LICENSE
+author:             Akshay Mankar
+maintainer:         itsakshaymankar@gmail.com
+category:           Web
+build-type:         Simple
+extra-doc-files:    CHANGELOG.md
+
+common warnings
+    ghc-options: -Wall
+
+executable berlin-scraper
+    import:           warnings
+    main-is:          Main.hs
+    build-depends:    base ^>=4.17.1.0
+                    , scalpel
+                    , aeson
+                    , wreq
+                    , text
+                    , lens
+                    , sqlite-simple
+                    , optparse-generic
+                    , telegram-bot-simple
+                    , telegram-bot-api
+                    , bytestring
+    hs-source-dirs:   app
+    default-language: GHC2021
diff --git a/berlin-scraper/default.nix b/berlin-scraper/default.nix
new file mode 100644
index 0000000..e85f4e5
--- /dev/null
+++ b/berlin-scraper/default.nix
@@ -0,0 +1,17 @@
+{ mkDerivation, aeson, base, bytestring, lens, lib
+, optparse-generic, scalpel, sqlite-simple, telegram-bot-api
+, telegram-bot-simple, text, wreq
+}:
+mkDerivation {
+  pname = "berlin-scraper";
+  version = "0.1.0.0";
+  src = ./.;
+  isLibrary = false;
+  isExecutable = true;
+  executableHaskellDepends = [
+    aeson base bytestring lens optparse-generic scalpel sqlite-simple
+    telegram-bot-api telegram-bot-simple text wreq
+  ];
+  license = lib.licenses.agpl3Plus;
+  mainProgram = "berlin-scraper";
+}
diff --git a/flake.lock b/flake.lock
new file mode 100644
index 0000000..abe2dae
--- /dev/null
+++ b/flake.lock
@@ -0,0 +1,61 @@
+{
+  "nodes": {
+    "flake-utils": {
+      "inputs": {
+        "systems": "systems"
+      },
+      "locked": {
+        "lastModified": 1694529238,
+        "narHash": "sha256-zsNZZGTGnMOf9YpHKJqMSsa0dXbfmxeoJ7xHlrt+xmY=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "ff7b65b44d01cf9ba6a71320833626af21126384",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1697915759,
+        "narHash": "sha256-WyMj5jGcecD+KC8gEs+wFth1J1wjisZf8kVZH13f1Zo=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "51d906d2341c9e866e48c2efcaac0f2d70bfd43e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixpkgs-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "flake-utils": "flake-utils",
+        "nixpkgs": "nixpkgs"
+      }
+    },
+    "systems": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}
diff --git a/flake.nix b/flake.nix
new file mode 100644
index 0000000..32d4244
--- /dev/null
+++ b/flake.nix
@@ -0,0 +1,37 @@
+{
+  description = "Dev Setup";
+
+  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
+  inputs.flake-utils.url = "github:numtide/flake-utils";
+
+  outputs = {nixpkgs, flake-utils, ...}:
+    flake-utils.lib.eachDefaultSystem (system:
+      let
+        pkgs = import nixpkgs { inherit system; };
+        ghcOverrides = hself: hsuper: rec {
+          berlin-scraper = hself.callPackage ./berlin-scraper {};
+        };
+        haskellPackages = pkgs.haskellPackages.override {
+          overrides = ghcOverrides;
+        };
+      in rec {
+        packages = rec {
+          dev-env = haskellPackages.shellFor {
+            packages = p: [ p.berlin-scraper ];
+            buildInputs = [
+              pkgs.haskellPackages.cabal-install
+              pkgs.haskell-language-server
+              pkgs.cabal2nix
+
+              # For cabal
+              pkgs.pkg-config
+              pkgs.binutils
+              pkgs.xq
+              pkgs.htmlq
+              pkgs.dasel
+            ];
+          };
+        };
+        defaultPackage = packages.dev-env;
+    });
+}