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

-- : out jr
-- : dep sqlite-simple
module Omni.Jr where

import Alpha
import qualified Data.List as List
import qualified Data.Text as Text
import qualified Omni.Agent.Core as AgentCore
import qualified Omni.Agent.Worker as AgentWorker
import qualified Omni.Cli as Cli
import qualified Omni.Task as Task
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 System.Environment (withArgs)
import qualified System.Environment as Env
import qualified System.Exit as Exit
import System.FilePath (takeFileName)
import qualified System.IO as IO
import qualified System.Process as Process

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|
jr

Usage:
  jr task [<args>...]
  jr work [<task-id>]
  jr review <task-id>
  jr merge-driver <ours> <theirs>
  jr test
  jr (-h | --help)

Commands:
  task          Manage tasks
  work          Start a worker agent on a task
  review        Review a completed task (show diff, accept/reject)
  merge-driver  Internal git merge driver

Options:
  -h --help  Show this help
|]

move :: Cli.Arguments -> IO ()
move args
  | args `Cli.has` Cli.command "task" = do
      let extraArgs = Cli.getAllArgs args (Cli.argument "args")
      withArgs extraArgs Task.main
  | args `Cli.has` Cli.command "work" = do
      -- Always run in current directory
      let path = "."

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

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

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

      AgentWorker.start worker taskId
  | args `Cli.has` Cli.command "review" = do
      tidStr <- getArgOrExit args (Cli.argument "task-id")
      reviewTask (Text.pack tidStr)
  | args `Cli.has` Cli.command "merge-driver" = mergeDriver args
  | otherwise = putText (str <| Docopt.usage help)

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
  -- Task.importTasks theirs

  -- We need to call task import via CLI or library.
  -- Omni.Task.importTasks IS NOT EXPOSED.
  -- But we can call Task.main
  withArgs ["import", "-i", theirs] Task.main
  Exit.exitSuccess

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

reviewTask :: Text -> IO ()
reviewTask tid = do
  tasks <- TaskCore.loadTasks
  case TaskCore.findTask tid tasks of
    Nothing -> do
      putText ("Task " <> tid <> " not found.")
      Exit.exitFailure
    Just task -> do
      TaskCore.showTaskDetailed task

      let grepArg = "--grep=" <> Text.unpack tid
      (code, shaOut, _) <-
        Process.readProcessWithExitCode
          "git"
          ["log", "--pretty=format:%H", "-n", "1", grepArg]
          ""

      when (code /= Exit.ExitSuccess || null shaOut) <| do
        putText "\nNo commit found for this task."
        putText "The worker may not have completed yet, or the commit message doesn't include the task ID."
        Exit.exitFailure

      let commitSha = case List.lines shaOut of
            (x : _) -> x
            [] -> ""

      putText "\n=== Diff for this task ===\n"
      _ <- Process.rawSystem "git" ["show", commitSha]

      putText "\n[a]ccept / [r]eject / [s]kip? "
      IO.hFlush IO.stdout
      choice <- getLine

      case Text.toLower choice of
        c
          | "a" `Text.isPrefixOf` c -> do
              TaskCore.updateTaskStatus tid TaskCore.Done []
              putText ("Task " <> tid <> " marked as Done.")
          | "r" `Text.isPrefixOf` c -> do
              putText "Enter rejection reason: "
              IO.hFlush IO.stdout
              reason <- getLine
              TaskCore.updateTaskStatus tid TaskCore.Open []
              putText ("Task " <> tid <> " reopened.")
              putText ("Reason: " <> reason)
          | otherwise -> putText "Skipped; no status change."

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