#!/bin/bash
#
#  Copyright 2023 The original authors
#
#  Licensed under the Apache License, Version 2.0 (the "License");
#  you may not use this file except in compliance with the License.
#  You may obtain a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
#  Unless required by applicable law or agreed to in writing, software
#  distributed under the License is distributed on an "AS IS" BASIS,
#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
#  See the License for the specific language governing permissions and
#  limitations under the License.
#

set -eo pipefail

if [ -z "$1" ]
  then
    echo "Usage: evaluate.sh <fork name> (<fork name 2> ...)"
    echo " for each fork, there must be a 'calculate_average_<fork name>.sh' script and an optional 'prepare_<fork name>.sh'."
    exit 1
fi

BOLD_WHITE='\033[1;37m'
CYAN='\033[0;36m'
GREEN='\033[0;32m'
PURPLE='\033[0;35m'
BOLD_RED='\033[1;31m'
RED='\033[0;31m'
BOLD_YELLOW='\033[1;33m'
RESET='\033[0m' # No Color

MEASUREMENTS_FILE="measurements_1B.txt"
RUNS=10
DEFAULT_JAVA_VERSION="21.0.1-open"
: "${BUILD_JAVA_VERSION:=21.0.1-open}"
RUN_TIME_LIMIT=300 # seconds

TIMEOUT=""
if [ "$(uname -s)" == "Linux" ]; then
  TIMEOUT="timeout -v $RUN_TIME_LIMIT"
else # MacOs
  if [ -x "$(command -v gtimeout)" ]; then
    TIMEOUT="gtimeout -v $RUN_TIME_LIMIT" # from `brew install coreutils`
  else
    echo -e "${BOLD_YELLOW}WARNING${RESET} gtimeout not available, benchmark runs may take indefinitely long."
  fi
fi

function check_command_installed {
  if ! [ -x "$(command -v $1)" ]; then
    echo "Error: $1 is not installed." >&2
    exit 1
  fi
}

function print_and_execute() {
  echo "+ $@" >&2
  "$@"
}

check_command_installed java
check_command_installed hyperfine
check_command_installed jq
check_command_installed bc

# Validate that ./calculate_average_<fork>.sh exists for each fork
for fork in "$@"; do
  if [ ! -f "./calculate_average_$fork.sh" ]; then
    echo -e "${BOLD_RED}ERROR${RESET}: ./calculate_average_$fork.sh does not exist." >&2
    exit 1
  fi
done

## SDKMAN Setup
# 1. Custom check for sdkman installed; not sure why check_command_installed doesn't detect it properly
if [ ! -f "$HOME/.sdkman/bin/sdkman-init.sh" ]; then
     echo -e "${BOLD_RED}ERROR${RESET}: sdkman is not installed." >&2
    exit 1
fi

# 2. Init sdkman in this script
source "$HOME/.sdkman/bin/sdkman-init.sh"

# 3. make sure the default java version is installed
if [ ! -d "$HOME/.sdkman/candidates/java/$DEFAULT_JAVA_VERSION" ]; then
  print_and_execute sdk install java $DEFAULT_JAVA_VERSION
fi

# 4. Install missing SDK java versions in any of the prepare_*.sh scripts for the provided forks
for fork in "$@"; do
  if [ -f "./prepare_$fork.sh" ]; then
    grep -h "^sdk use" "./prepare_$fork.sh" | cut -d' ' -f4 | while read -r version; do
      if [ ! -d "$HOME/.sdkman/candidates/java/$version" ]; then
        print_and_execute sdk install java $version
      fi
    done || true # grep returns exit code 1 when no match, `|| true` prevents the script from exiting early
  fi
done
## END - SDKMAN Setup

# Check if SMT is enabled (we want it disabled)
if [ -f "/sys/devices/system/cpu/smt/active" ]; then
  if [ "$(cat /sys/devices/system/cpu/smt/active)" != "0" ]; then
    echo -e "${BOLD_YELLOW}WARNING${RESET} SMT is enabled"
  fi
fi

# Check if Turbo Boost is enabled (we want it disabled)
if [ -f "/sys/devices/system/cpu/cpufreq/boost" ]; then
  if [ "$(cat /sys/devices/system/cpu/cpufreq/boost)" != "0" ]; then
    echo -e "${BOLD_YELLOW}WARNING${RESET} Turbo Boost is enabled"
  fi
fi

print_and_execute sdk use java $BUILD_JAVA_VERSION
print_and_execute java --version
print_and_execute ./mvnw --quiet clean verify

print_and_execute rm -f measurements.txt
print_and_execute ln -s $MEASUREMENTS_FILE measurements.txt

echo ""

# check if measurements_xxx.out exists
if [ ! -f "${MEASUREMENTS_FILE%.txt}.out" ]; then
  echo -e "${BOLD_RED}ERROR${RESET}: ${MEASUREMENTS_FILE%.txt}.out does not exist." >&2
  echo "Please create it with:"
  echo ""
  echo "  ./calculate_average_baseline.sh > ${MEASUREMENTS_FILE%.txt}.out"
  echo ""
  exit 1
fi

# Run tests and benchmark for each fork
filetimestamp=$(date  +"%Y%m%d%H%M%S") # same for all fork.out files from this run
failed=()
for fork in "$@"; do
  set +e # we don't want prepare.sh, test.sh or hyperfine failing on 1 fork to exit the script early

  # Run prepare script
  if [ -f "./prepare_$fork.sh" ]; then
    print_and_execute source "./prepare_$fork.sh"
  else
    print_and_execute sdk use java $DEFAULT_JAVA_VERSION
  fi

  # Run the test suite
  print_and_execute $TIMEOUT ./test.sh $fork
  if [ $? -ne 0 ]; then
    failed+=("$fork")
    echo ""
    echo -e "${BOLD_RED}FAILURE${RESET}: ./test.sh $fork failed"

    continue
  fi
  echo ""

  # Run the test on $MEASUREMENTS_FILE; this serves as the warmup
  print_and_execute $TIMEOUT ./test.sh $fork $MEASUREMENTS_FILE
  if [ $? -ne 0 ]; then
    failed+=("$fork")
    echo ""
    echo -e "${BOLD_RED}FAILURE${RESET}: ./test.sh $fork $MEASUREMENTS_FILE failed"

    continue
  fi
  echo ""

  # re-link measurements.txt since test.sh deleted it
  print_and_execute rm -f measurements.txt
  print_and_execute ln -s $MEASUREMENTS_FILE measurements.txt

  # Use hyperfine to run the benchmark for each fork
  HYPERFINE_OPTS="--warmup 0 --runs $RUNS --export-json $fork-$filetimestamp-timing.json --output ./$fork-$filetimestamp.out"

  # check if this script is running on a Linux box
  if [ "$(uname -s)" == "Linux" ]; then
    check_command_installed numactl

    # Linux platform
    # prepend this with numactl --physcpubind=0-7 for running it only with 8 cores
    numactl --physcpubind=0-7 hyperfine $HYPERFINE_OPTS "$TIMEOUT ./calculate_average_$fork.sh 2>&1"
  else # MacOS
    hyperfine $HYPERFINE_OPTS "$TIMEOUT ./calculate_average_$fork.sh 2>&1"
  fi
  # Catch hyperfine command failed
  if [ $? -ne 0 ]; then
    failed+=("$fork")
    # Hyperfine already prints the error message
    echo ""
    continue
  fi
done
set -e

# Summary
echo -e "${BOLD_WHITE}Summary${RESET}"
for fork in "$@"; do
  # skip reporting results for failed forks
  if [[ " ${failed[@]} " =~ " ${fork} " ]]; then
    echo -e "  ${RED}$fork${RESET}: command failed or output did not match"
    continue
  fi

  # Trimmed mean = The slowest and the fastest runs are discarded, the
  # mean value of the remaining three runs is the result for that contender
  trimmed_mean=$(jq -r '.results[0].times | sort_by(.|tonumber) | .[1:-1] | add / length' $fork-$filetimestamp-timing.json)
  raw_times=$(jq -r '.results[0].times | join(",")' $fork-$filetimestamp-timing.json)

  if [ "$fork" == "$1" ]; then
    color=$CYAN
  elif [ "$fork" == "$2" ]; then
    color=$GREEN
  else
    color=$PURPLE
  fi

  echo -e "  ${color}$fork${RESET}: trimmed mean ${BOLD_WHITE}$trimmed_mean${RESET}, raw times ${BOLD_WHITE}$raw_times${RESET}"
done
echo ""

## Leaderboard - prints the leaderboard in Markdown table format
echo -e "${BOLD_WHITE}Leaderboard${RESET}"

# 1. Create a temp file to store the leaderboard entries
leaderboard_temp_file=$(mktemp)

# 2. Process each fork and append the 1-line entry to the temp file
for fork in "$@"; do
  # skip reporting results for failed forks
  if [[ " ${failed[@]} " =~ " ${fork} " ]]; then
    continue
  fi

  trimmed_mean=$(jq -r '.results[0].times | sort_by(.|tonumber) | .[1:-1] | add / length' $fork-$filetimestamp-timing.json)

  # trimmed_mean is in seconds
  # Format trimmed_mean as MM::SS.mmm
  # using bc
  trimmed_mean_minutes=$(echo "$trimmed_mean / 60" | bc)
  trimmed_mean_seconds=$(echo "$trimmed_mean % 60 / 1" | bc)
  trimmed_mean_ms=$(echo "($trimmed_mean - $trimmed_mean_minutes * 60 - $trimmed_mean_seconds) * 1000 / 1" | bc)
  trimmed_mean_formatted=$(printf "%02d:%02d.%03d" $trimmed_mean_minutes $trimmed_mean_seconds $trimmed_mean_ms)

  # Get Github user's name from public Github API (rate limited after ~50 calls, so results are cached in github_users.txt)
  set +e
  github_user__name=$(grep "^$fork;" github_users.txt | cut -d ';' -f2)
  if [ -z "$github_user__name" ]; then
    github_user__name=$(curl -s https://api.github.com/users/$fork | jq -r '.name' | tr -d '"')
    if [ "$github_user__name" != "null" ]; then
      echo "$fork;$github_user__name" >> github_users.txt
    else
      github_user__name=$fork
    fi
  fi
  set -e

  # Read java version from prepare_$fork.sh if it exists, otherwise assume 21.0.1-open
  java_version="21.0.1-open"
  # Hard-coding the note message for now
  notes=""
  if [ -f "./prepare_$fork.sh" ]; then
    java_version=$(grep -F "sdk use java" ./prepare_$fork.sh | cut -d' ' -f4)

    if grep -F "native-image" -q ./prepare_$fork.sh ; then
      notes="GraalVM native binary"
    fi
  fi

  # check if Java source file uses Unsafe
  if grep -F "theUnsafe" -q ./src/main/java*/dev/morling/onebrc/CalculateAverage_$fork.java ; then
    # if notes is not empty, append a comma and space before the unsafe note
    notes="${notes:+$notes, }uses Unsafe"
  fi

  echo -n "$trimmed_mean;" >> $leaderboard_temp_file # for sorting
  echo -n "| # " >> $leaderboard_temp_file
  echo -n "| $trimmed_mean_formatted " >> $leaderboard_temp_file
  echo -n "| [link](https://github.com/gunnarmorling/1brc/blob/main/src/main/java/dev/morling/onebrc/CalculateAverage_$fork.java)" >> $leaderboard_temp_file
  echo -n "| $java_version " >> $leaderboard_temp_file
  echo -n "| [$github_user__name](https://github.com/$fork) " >> $leaderboard_temp_file
  echo -n "| $notes " >> $leaderboard_temp_file
  echo "|" >> $leaderboard_temp_file
done

# 3. Sort leaderboard_temp_file by trimmed_mean and remove the sorting column
sort -n $leaderboard_temp_file | cut -d ';' -f 2 > $leaderboard_temp_file.sorted

# 4. Print the leaderboard
echo ""
echo "| # | Result (m:s.ms) | Implementation     | JDK | Submitter     | Notes     |"
echo "|---|-----------------|--------------------|-----|---------------|-----------|"
# If $leaderboard_temp_file.sorted has more than 3 entires, include rankings
if [ $(wc -l < $leaderboard_temp_file.sorted) -gt 3 ]; then
  head -n 1 $leaderboard_temp_file.sorted | tr '#' 1
  head -n 2 $leaderboard_temp_file.sorted | tail -n 1 | tr '#' 2
  head -n 3 $leaderboard_temp_file.sorted | tail -n 1 | tr '#' 3
  tail -n+4 $leaderboard_temp_file.sorted | tr '#' ' '
else
  # Don't show rankings
  cat $leaderboard_temp_file.sorted | tr '#' ' '
fi
echo ""

# 5. Cleanup
rm $leaderboard_temp_file
## END - Leaderboard

# Finalize .out files
echo "Raw results saved to file(s):"
for fork in "$@"; do
  if [ -f "$fork-$filetimestamp-timing.json" ]; then
      cat $fork-$filetimestamp-timing.json >> $fork-$filetimestamp.out
      rm $fork-$filetimestamp-timing.json
  fi

  if [ -f "$fork-$filetimestamp.out" ]; then
    echo "  $fork-$filetimestamp.out"
  fi
done
