@echo off
setlocal
REM =========================================================================
REM  Wuju (wuju.gg) - watch replay NA1_5614364120
REM
REM  What this file does, in plain English:
REM
REM    1. Finds YOUR League client on THIS PC and reads the port number and
REM       one-time password that the client writes into its own "lockfile"
REM       while it is running.
REM    2. Asks that client - at https://127.0.0.1, an address that can only
REM       ever mean "this computer" - to open replay 5614364120.
REM
REM  That is the whole story. It contacts no server of ours, it downloads
REM  nothing from the internet, and it never sees your Riot password. The
REM  lockfile password is a random string the client invents for itself
REM  every time it starts, and it dies when the client closes.
REM
REM  Everything below is ordinary Windows batch plus curl.exe, which ships
REM  with Windows. Nothing is encoded, compressed or hidden. Please read it.
REM =========================================================================

REM The only two values this file was generated with.
set "GAME_ID=5614364120"
set "REGION=NA1"

title Wuju - replay %REGION%_%GAME_ID%
echo.
echo   Wuju - opening replay %REGION%_%GAME_ID%
echo.

where curl.exe >nul 2>nul
if errorlevel 1 goto no_curl

REM --- 1. find the running client -----------------------------------------
REM While League is running it keeps a file called "lockfile" in its install
REM folder, and deletes it on exit. The format is one line:
REM     name:pid:port:password:protocol
set "LEAGUE_DIR="
call :find_league
if not defined LEAGUE_DIR goto no_client
if not exist "%LEAGUE_DIR%\lockfile" goto no_client

set "PORT="
set "PASSWORD="
REM The client keeps the lockfile open, so it has to be read through "type"
REM rather than opened directly. Fields 3 and 4 are the port and password.
for /f "usebackq tokens=3,4 delims=:" %%a in (`type "%LEAGUE_DIR%\lockfile"`) do (
  set "PORT=%%a"
  set "PASSWORD=%%b"
)
if not defined PORT goto no_client
if not defined PASSWORD goto no_client

REM -s: no progress bar. -k: the client signs its own local certificate, so
REM curl has nothing to check it against. Nothing here leaves this PC.
set "LCU=https://127.0.0.1:%PORT%"
set "CURL=curl.exe -s -k -u riot:%PASSWORD%"

REM --- 2. right client, right region? -------------------------------------
REM findstr /r treats "." as "any character", which is how these patterns
REM match the quote marks in the JSON without fighting batch over quoting.
%CURL% "%LCU%/lol-rso-auth/v1/authorization" | findstr /r /c:"currentPlatformId.: *.[A-Z]" >nul
if errorlevel 1 goto not_logged_in
%CURL% "%LCU%/lol-rso-auth/v1/authorization" | findstr /r /c:"currentPlatformId.: *.%REGION%." >nul
if errorlevel 1 goto wrong_region

REM --- 3. ask the client to download the replay ----------------------------
REM "download" rather than "watch": asked to watch a replay it has never
REM downloaded, the client sometimes quietly does nothing. Asked to download
REM it, it always starts. The watching happens in step 5.
REM This reply is worthless: the client answers "204 No Content" whether or
REM not it can actually get the replay. Step 4 is the real answer.
%CURL% -X POST -H "Content-Type: application/json" -d "{}" "%LCU%/lol-replays/v1/rofls/%GAME_ID%/download" >nul

REM --- 4. wait for the download --------------------------------------------
echo   Asking your client for the replay. This can take up to a minute...
set /a TRIES=0
set /a RETRIES=0

:poll
%CURL% "%LCU%/lol-replays/v1/metadata/%GAME_ID%" | findstr /r /c:"state.: *.watch." >nul
if not errorlevel 1 goto launch
%CURL% "%LCU%/lol-replays/v1/metadata/%GAME_ID%" | findstr /r /c:"state.: *.incompatible." >nul
if not errorlevel 1 goto old_patch
REM Riot's replay service drops downloads mid-transfer now and then. The
REM client then reports "retryDownload" and waits to be asked again, so ask
REM again - a few times - before concluding the replay is unavailable.
%CURL% "%LCU%/lol-replays/v1/metadata/%GAME_ID%" | findstr /r /c:"state.: *.retryDownload." >nul
if not errorlevel 1 goto retry_download

:poll_wait
set /a TRIES+=1
if %TRIES% GEQ 60 goto unavailable
REM One second between checks. 2>nul because "timeout" objects when this
REM file is run from something other than a normal console window.
timeout /t 1 /nobreak >nul 2>nul
goto poll

:retry_download
if %RETRIES% GEQ 3 goto unavailable
set /a RETRIES+=1
echo   Riot dropped the download partway - asking again (try %RETRIES% of 3)...
%CURL% -X POST -H "Content-Type: application/json" -d "{}" "%LCU%/lol-replays/v1/rofls/%GAME_ID%/download" >nul
REM Give the client a moment to leave the retryDownload state before the
REM next check, or all three retries burn in three seconds.
timeout /t 3 /nobreak >nul 2>nul
goto poll_wait

REM --- 5. downloaded - now play it -----------------------------------------
:launch
%CURL% -X POST -H "Content-Type: application/json" -d "{}" "%LCU%/lol-replays/v1/rofls/%GAME_ID%/watch" >nul
echo.
echo   Done - the replay is opening in your League client.
echo.
exit /b 0

REM --- things that can go wrong -------------------------------------------

:no_curl
echo   This file needs curl.exe, which is part of Windows 10 from April 2018
echo   onwards. It was not found on this PC, so this script cannot run.
goto stop

:no_client
echo   Could not find a running League client.
echo.
echo   Start League of Legends, log in, let the client finish loading, then
echo   run this file again.
goto stop

:not_logged_in
echo   Your League client is running but is not logged in yet.
echo.
echo   Finish logging in, then run this file again.
goto stop

:wrong_region
echo   This replay was played on %REGION%, and your client is logged in to a
echo   different region.
echo.
echo   Riot only lets an account download replays from its own region, so
echo   there is no way to open this one from here.
goto stop

:old_patch
echo   This replay is from an older patch and League can no longer play it.
echo.
echo   Riot deletes replay data each patch, so this one cannot be opened.
goto stop

:unavailable
echo   Your client could not fetch this replay.
echo.
echo   The game may have aged out of Riot's replay storage, or the client
echo   may be busy patching. Try again in a few minutes.
goto stop

:stop
echo.
pause
exit /b 1

REM --- helper: where is League installed? ----------------------------------

:find_league
REM Riot keeps its own list of install folders here, so ask that first.
set "INSTALLS=%ProgramData%\Riot Games\RiotClientInstalls.json"
if not exist "%INSTALLS%" goto default_paths
REM The carets are how batch escapes a quote used as a delimiter: split the
REM matching line on quote marks and keep the second piece, which is the path.
for /f "usebackq delims=" %%L in (`findstr /i /c:"League of Legends" "%INSTALLS%"`) do (
  if not defined LEAGUE_DIR for /f tokens^=2^ delims^=^" %%P in ("%%L") do set "LEAGUE_DIR=%%P"
)
if not defined LEAGUE_DIR goto default_paths
REM That file stores the path with forward slashes on current clients and
REM doubled backslashes on older ones. Turn either into a normal path.
set "LEAGUE_DIR=%LEAGUE_DIR:\\=\%"
set "LEAGUE_DIR=%LEAGUE_DIR:/=\%"
if "%LEAGUE_DIR:~-1%"=="\" set "LEAGUE_DIR=%LEAGUE_DIR:~0,-1%"
if exist "%LEAGUE_DIR%\lockfile" exit /b

:default_paths
set "LEAGUE_DIR=C:\Riot Games\League of Legends"
if exist "%LEAGUE_DIR%\lockfile" exit /b
set "LEAGUE_DIR=%ProgramFiles%\Riot Games\League of Legends"
if exist "%LEAGUE_DIR%\lockfile" exit /b
set "LEAGUE_DIR="
exit /b