{-# LANGUAGE LambdaCase #-}
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE QuasiQuotes #-}
{-# LANGUAGE NoImplicitPrelude #-}

-- : out agent
-- : dep sqlite-simple
-- : dep temporary
module Omni.Agent where

import Alpha
import qualified Data.Text as Text
import qualified Omni.Agent.Core as Core
import qualified Omni.Agent.Log as Log
import qualified Omni.Agent.Worker as Worker
import qualified Omni.Cli as Cli
import qualified Omni.Task.Core as TaskCore
import qualified Omni.Test as Test
import qualified System.Console.Docopt as Docopt
import qualified System.Directory as Directory
import qualified System.Environment as Env
import qualified System.Exit as Exit
import System.FilePath (takeFileName)

main :: IO ()
main = Cli.main plan

plan :: Cli.Plan ()
plan =
  Cli.Plan
    { Cli.help = help,
      Cli.move = move,
      Cli.test = test,
      Cli.tidy = \_ -> pure ()
    }

help :: Cli.Docopt
help =
  [Cli.docopt|
agent

Usage:
  agent start [<task-id>]
  agent merge-driver <ours> <theirs>
  agent test
  agent --help

Options:
  --path=<path>   Path to the worker directory [default: .]
  --help          Show this help
|]

move :: Cli.Arguments -> IO ()
move args
  | args `Cli.has` Cli.command "start" = do
      -- Always run in current directory
      let path = "."

      -- Infer name from current directory
      absPath <- Directory.getCurrentDirectory
      let name = Text.pack (takeFileName absPath)

      let worker =
            Core.Worker
              { Core.workerName = name,
                Core.workerPid = Nothing,
                Core.workerStatus = Core.Idle,
                Core.workerPath = path
              }

      let taskId = fmap Text.pack (Cli.getArg args (Cli.argument "task-id"))

      Worker.start worker taskId
  | args `Cli.has` Cli.command "merge-driver" = mergeDriver args
  | otherwise = putStrLn (Cli.usage help)

getArgOrExit :: Cli.Arguments -> Docopt.Option -> IO String
getArgOrExit args opt =
  case Cli.getArg args opt of
    Just val -> pure val
    Nothing -> do
      putText <| "Error: Missing required argument " <> Text.pack (show opt)
      Exit.exitFailure

mergeDriver :: Cli.Arguments -> IO ()
mergeDriver args = do
  ours <- getArgOrExit args (Cli.argument "ours")
  theirs <- getArgOrExit args (Cli.argument "theirs")

  -- Set TASK_DB_PATH to ours (the file git provided as the current version)
  -- Since we are no longer using git-tracked tasks.jsonl, this merge driver logic needs rethinking.
  -- If the merge driver is called, it means git found a conflict in .tasks/tasks.jsonl, but we deleted it.
  -- So this code might be dead, or we might be dealing with legacy files during a rebase.
  -- For now, we'll keep the logic but be aware it's likely unused.
  Env.setEnv "TASK_DB_PATH" ours
  TaskCore.importTasks theirs
  Exit.exitSuccess

test :: Test.Tree
test = Test.group "Omni.Agent" [unitTests, logTests]

logTests :: Test.Tree
logTests =
  Test.group
    "Log tests"
    [ Test.unit "Log.emptyStatus" <| do
        let s = Log.emptyStatus "worker-1"
        Log.statusWorker s Test.@?= "worker-1"
        Log.statusFiles s Test.@?= 0
    ]

unitTests :: Test.Tree
unitTests =
  Test.group
    "Unit tests"
    [ Test.unit "can parse start command" <| do
        let result = Docopt.parseArgs help ["start"]
        case result of
          Left err -> Test.assertFailure <| "Failed to parse 'start': " <> show err
          Right args -> args `Cli.has` Cli.command "start" Test.@?= True,
      Test.unit "can parse start command with task id" <| do
        let result = Docopt.parseArgs help ["start", "t-123"]
        case result of
          Left err -> Test.assertFailure <| "Failed to parse 'start t-123': " <> show err
          Right args -> do
            args `Cli.has` Cli.command "start" Test.@?= True
            Cli.getArg args (Cli.argument "task-id") Test.@?= Just "t-123"
    ]