{-# LANGUAGE OverloadedStrings #-}

module Plugin.GitHubCommit
    ( gitHubCommit
    ) where

import Database.SQLite.Simple
import Database.SQLite.Simple.FromRow
import Text.Regex.TDFA

import qualified Message as M
import Plugin.Base

gitHubCommit = Plugin
    { matchRegex = "^[0-9a-f]{40}$"
    , perform = gitHubCommitAction
    }

gitHubCommitAction :: PluginAction
gitHubCommitAction message dbConn = do
    rs <- query dbConn "SELECT repo_url \
        \ FROM plugin_github_commit_channel_repo_urls \
        \ WHERE channel = ? \
        \ LIMIT 1"
        (Only (M.channel message))
        :: IO [RepoUrlRow]
    return $ respond rs
  where
    respond []     = Left "I couldn't find a repo URL for this channel. \
        \Try `git remote set origin REPO_URL`"
    respond ((RepoUrlRow r):rs) =
        Right $ r ++ "/commits/" ++ M.text message =~ matchRegex gitHubCommit

type Id = Int

type RepoUrl = String

-- | A type to match the database table for this plugin.
data RepoUrlRow = RepoUrlRow RepoUrl

instance FromRow RepoUrlRow where
    fromRow = RepoUrlRow <$> field