name: Update FrogPilot Branch

on:
  schedule:
    - cron: "0 18 * * *"

env:
  BRANCH_FROGPILOT: FrogPilot
  BRANCH_PREVIOUS: FrogPilot-Previous
  BRANCH_STAGING: FrogPilot-Staging

  TZ: America/Phoenix

  UPDATE_FILE: .github/update_date

jobs:
  check_update:
    runs-on: ubuntu-latest
    outputs:
      update_due: ${{ steps.check_update.outputs.update_due }}
      scheduled_date: ${{ steps.check_update.outputs.scheduled_date }}
    steps:
      - name: Download the 'update_date' File
        id: download_update
        run: |
          curl -fLsS "https://raw.githubusercontent.com/FrogAi/FrogPilot/${{ env.BRANCH_STAGING }}/${{ env.UPDATE_FILE }}" -o update_date || touch update_date_missing

      - name: Check If Update Is Due
        id: check_update
        run: |
          if [ -f update_date_missing ]; then
            echo "No update_date file found in FrogPilot-Staging."
            echo "update_due=false" >> "$GITHUB_OUTPUT"
            exit 0
          fi

          SCHEDULED_DATE=$(cat update_date)
          CURRENT_DATE=$(TZ="${{ env.TZ }}" date +%F)
          echo "Scheduled Date: $SCHEDULED_DATE"
          echo "Current Date: $CURRENT_DATE"

          if [ "$SCHEDULED_DATE" != "$CURRENT_DATE" ]; then
            echo "Update not due."
            echo "update_due=false" >> "$GITHUB_OUTPUT"
            exit 0
          fi

          echo "update_due=true" >> "$GITHUB_OUTPUT"
          echo "scheduled_date=$SCHEDULED_DATE" >> "$GITHUB_OUTPUT"

  update_branch:
    needs: check_update
    if: ${{ needs.check_update.outputs.update_due == 'true' }}
    runs-on: ubuntu-latest
    steps:
      - name: Configure Git Identity
        run: |
          git config --global user.name "${{ github.actor }}"
          git config --global user.email "${{ github.actor }}@users.noreply.github.com"

      - name: Checkout ${{ env.BRANCH_STAGING }}
        uses: actions/checkout@v3
        with:
          fetch-depth: 0
          ref: ${{ env.BRANCH_STAGING }}

      - name: Update README Date and Remove (${{ env.UPDATE_FILE }})
        run: |
          DAY=$(TZ="${{ env.TZ }}" date +'%d' | sed 's/^0//')
          case "$DAY" in
            1|21|31) SUFFIX="st" ;;
            2|22) SUFFIX="nd" ;;
            3|23) SUFFIX="rd" ;;
            *) SUFFIX="th" ;;
          esac
          MONTH=$(TZ="${{ env.TZ }}" date +'%B')
          YEAR=$(TZ="${{ env.TZ }}" date +'%Y')
          NEW_DATE="**${MONTH} ${DAY}${SUFFIX}, ${YEAR}**"

          echo "Updating README date to ${NEW_DATE}"
          sed -i "/FrogPilot was last updated on:/ { N; N; s/\(\n\)\n.*$/\1\n${NEW_DATE}/; }" README.md

          git add README.md
          git rm -f "${{ env.UPDATE_FILE }}"
          git commit -m "Updated README date to ${NEW_DATE}"

      - name: Squash Commits
        run: |
          COMMIT_MSG=$(git log -1 --pretty=%B HEAD~1)

          git reset --soft HEAD~2
          git commit -m "$COMMIT_MSG"

      - name: Rewrite Commit Dates to Noon ${{ env.TZ }}
        run: |
          COMMIT_DATETIME="${{ needs.check_update.outputs.scheduled_date }} 12:00"
          COMMIT_PHX=$(TZ="${{ env.TZ }}" date -d "$COMMIT_DATETIME" +"%Y-%m-%dT%H:%M:%S %z")

          git filter-branch --env-filter "export GIT_AUTHOR_DATE='$COMMIT_PHX'; export GIT_COMMITTER_DATE='$COMMIT_PHX'" "${{ env.BRANCH_STAGING }}"

      - name: Fetch ${{ env.BRANCH_PREVIOUS }} and ${{ env.BRANCH_FROGPILOT }}
        run: |
          git fetch origin ${{ env.BRANCH_PREVIOUS }} ${{ env.BRANCH_FROGPILOT }}

      - name: Wait Until Noon ${{ env.TZ }} Before Continuing
        run: |
          NOW=$(TZ="${{ env.TZ }}" date +%s)
          TARGET=$(TZ="${{ env.TZ }}" date -d "12:00" +%s)

          if [ "$NOW" -lt "$TARGET" ]; then
            SLEEP_TIME=$((TARGET - NOW))
            echo "Sleeping for $SLEEP_TIME seconds until noon..."
            sleep $SLEEP_TIME
          else
            echo "It is already noon or past noon, proceeding immediately."
          fi

      - name: Push ${{ env.BRANCH_STAGING }}
        run: |
          git push origin "${{ env.BRANCH_STAGING }}" --force

      - name: Reset ${{ env.BRANCH_PREVIOUS }} to Match ${{ env.BRANCH_FROGPILOT }}
        run: |
          git switch "${{ env.BRANCH_PREVIOUS }}"
          git reset --hard "origin/${{ env.BRANCH_FROGPILOT }}"
          git push origin "${{ env.BRANCH_PREVIOUS }}" --force

      - name: Reset ${{ env.BRANCH_FROGPILOT }} to Match ${{ env.BRANCH_STAGING }}
        run: |
          git switch "${{ env.BRANCH_FROGPILOT }}"
          git reset --hard "origin/${{ env.BRANCH_STAGING }}"
          git push origin "${{ env.BRANCH_FROGPILOT }}" --force