name: Diffcalc Consistency Checks
on:
  issue_comment:
    types: [ created ]

env:
  DB_USER: root
  DB_HOST: 127.0.0.1
  CONCURRENCY: 4
  ALLOW_DOWNLOAD: 1
  SAVE_DOWNLOADED: 1

jobs:
  diffcalc:
    name: Diffcalc
    runs-on: ubuntu-latest

    if: |
      contains(github.event.comment.html_url, '/pull/') &&
      contains(github.event.comment.body, '!pp check') &&
      ${{ github.event.comment.author_association == 'MEMBER' }}


    strategy:
      fail-fast: false
      matrix:
        ruleset:
          - { name: osu, id: 0 }
          - { name: taiko, id: 1 }
          - { name: catch, id: 2 }
          - { name: mania, id: 3 }

    services:
      mysql:
        image: mysql:8.0
        env:
          MYSQL_ALLOW_EMPTY_PASSWORD: yes
        ports:
          - 3306:3306
        options: --health-cmd="mysqladmin ping" --health-interval=10s --health-timeout=5s --health-retries=3

    steps:
      - name: Verify MySQL connection from host
        run: |
          sudo apt-get install -y mysql-client
          mysql --host ${{ env.DB_HOST }} -u${{ env.DB_USER }} -e "SHOW DATABASES"

      - name: Create directory structure
        run: |
          mkdir -p $GITHUB_WORKSPACE/master/
          mkdir -p $GITHUB_WORKSPACE/pr/

      # Checkout osu
      - name: Checkout osu (master)
        uses: actions/checkout@v2
        with:
          repository: ppy/osu
          path: 'master/osu'
      - name: Checkout osu (pr)
        uses: actions/checkout@v2
        with:
          path: 'pr/osu'

      # Checkout osu-difficulty-calculator
      - name: Checkout osu-difficulty-calculator (master)
        uses: actions/checkout@v2
        with:
          repository: ppy/osu-difficulty-calculator
          path: 'master/osu-difficulty-calculator'
      - name: Checkout osu-difficulty-calculator (pr)
        uses: actions/checkout@v2
        with:
          repository: ppy/osu-difficulty-calculator
          path: 'pr/osu-difficulty-calculator'

      - name: Install .NET 5.0.x
        uses: actions/setup-dotnet@v1
        with:
          dotnet-version: "5.0.x"

      # Sanity checks to make sure diffcalc is not run when incompatible.
      - name: Build diffcalc (master)
        run: |
          cd $GITHUB_WORKSPACE/master/osu-difficulty-calculator
          ./UseLocalOsu.sh
          dotnet build
      - name: Build diffcalc (pr)
        run: |
          cd $GITHUB_WORKSPACE/pr/osu-difficulty-calculator
          ./UseLocalOsu.sh
          dotnet build

      # Initial data imports
      - name: Download + import data
        run: |
          PERFORMANCE_DATA_NAME=$(curl https://data.ppy.sh/ | grep performance_${{ matrix.ruleset.name }}_random | tail -1 | awk -F "\"" '{print $2}' | sed 's/\.tar\.bz2//g')
          BEATMAPS_DATA_NAME=$(curl https://data.ppy.sh/ | grep osu_files | tail -1 | awk -F "\"" '{print $2}' | sed 's/\.tar\.bz2//g')

          # Set env variable for further steps.
          echo "BEATMAPS_PATH=$GITHUB_WORKSPACE/$BEATMAPS_DATA_NAME" >> $GITHUB_ENV

          cd $GITHUB_WORKSPACE

          wget https://data.ppy.sh/$PERFORMANCE_DATA_NAME.tar.bz2
          wget https://data.ppy.sh/$BEATMAPS_DATA_NAME.tar.bz2
          tar -xf $PERFORMANCE_DATA_NAME.tar.bz2
          tar -xf $BEATMAPS_DATA_NAME.tar.bz2

          cd $GITHUB_WORKSPACE/$PERFORMANCE_DATA_NAME

          mysql --host ${{ env.DB_HOST }} -u${{ env.DB_USER }} -e "CREATE DATABASE osu_master"
          mysql --host ${{ env.DB_HOST }} -u${{ env.DB_USER }} -e "CREATE DATABASE osu_pr"

          cat *.sql | mysql --host ${{ env.DB_HOST }} -u${{ env.DB_USER }} --database=osu_master
          cat *.sql | mysql --host ${{ env.DB_HOST }} -u${{ env.DB_USER }} --database=osu_pr

      # Run diffcalc
      - name: Run diffcalc (master)
        env:
          DB_NAME: osu_master
        run: |
          cd $GITHUB_WORKSPACE/master/osu-difficulty-calculator/osu.Server.DifficultyCalculator
          dotnet run -c:Release -- all -m ${{ matrix.ruleset.id }} -ac -c ${{ env.CONCURRENCY }}
      - name: Run diffcalc (pr)
        env:
          DB_NAME: osu_pr
        run: |
          cd $GITHUB_WORKSPACE/pr/osu-difficulty-calculator/osu.Server.DifficultyCalculator
          dotnet run -c:Release -- all -m ${{ matrix.ruleset.id }} -ac -c ${{ env.CONCURRENCY }}

      # Print diffs
      - name: Print diffs
        run: |
          mysql --host ${{ env.DB_HOST }} -u${{ env.DB_USER }} -e "
            SELECT
              m.beatmap_id,
              m.mods,
              m.diff_unified as `sr_master`,
              p.diff_unified as `sr_pr`,
              (p.diff_unified - m.diff_unified) as `diff`
            FROM osu_master.osu_beatmap_difficulty m
            JOIN osu_pr.osu_beatmap_difficulty p
              ON m.beatmap_id = p.beatmap_id
              AND m.mode = p.mode
              AND m.mods = p.mods
            WHERE abs(m.diff_unified - p.diff_unified) > 0.1
            ORDER BY abs(m.diff_unified - p.diff_unified)
              DESC;"

      # Todo: Run ppcalc