name: Bot Reply on Mention

on:
  issue_comment:
    types: [created]

jobs:
  continuous-reply:
    if: ${{ contains(github.event.comment.body, '@mirrobot') || contains(github.event.comment.body, '@mirrobot-agent') }}
    runs-on: ubuntu-latest
    permissions:
      contents: write
      issues: write
      pull-requests: write

    env:
      THREAD_NUMBER: ${{ github.event.issue.number }}
      BOT_NAMES_JSON: '["mirrobot", "mirrobot-agent", "mirrobot-agent[bot]"]'
      IGNORE_BOT_NAMES_JSON: '["ellipsis-dev"]'
      COMMENT_FETCH_LIMIT: '20'
      REVIEW_FETCH_LIMIT: '15'
      REVIEW_THREAD_FETCH_LIMIT: '20'
      THREAD_COMMENT_FETCH_LIMIT: '5'

    steps:

      - name: Checkout repository
        uses: actions/checkout@v4

      - name: Bot Setup
        id: setup
        uses: ./.github/actions/bot-setup
        with:
          bot-app-id: ${{ secrets.BOT_APP_ID }}
          bot-private-key: ${{ secrets.BOT_PRIVATE_KEY }}
          opencode-api-key: ${{ secrets.OPENCODE_API_KEY }}
          opencode-model: ${{ secrets.OPENCODE_MODEL }}
          opencode-fast-model: ${{ secrets.OPENCODE_FAST_MODEL }}
          custom-providers-json: ${{ secrets.CUSTOM_PROVIDERS_JSON }}

      - name: Add reaction to comment
        env:
          GH_TOKEN: ${{ steps.setup.outputs.token }}
        run: |
          gh api \
            --method POST \
            -H "Accept: application/vnd.github+json" \
            /repos/${{ github.repository }}/issues/comments/${{ github.event.comment.id }}/reactions \
            -f content='eyes'

      - name: Gather Full Thread Context
        id: context
        env:
          GH_TOKEN: ${{ steps.setup.outputs.token }}
          BOT_NAMES_JSON: ${{ env.BOT_NAMES_JSON }}
          IGNORE_BOT_NAMES_JSON: ${{ env.IGNORE_BOT_NAMES_JSON }}
        run: |
          # Common Info
          echo "NEW_COMMENT_AUTHOR=${{ github.event.comment.user.login }}" >> $GITHUB_ENV
          # Use a unique delimiter for safety
          COMMENT_DELIMITER="GH_BODY_DELIMITER_$(openssl rand -hex 8)"
          { echo "NEW_COMMENT_BODY<<$COMMENT_DELIMITER"; echo "${{ github.event.comment.body }}"; echo "$COMMENT_DELIMITER"; } >> "$GITHUB_ENV"
          # Determine if PR or Issue
          if [ -n '${{ github.event.issue.pull_request }}' ]; then
            IS_PR="true"
          else
            IS_PR="false"
          fi
          echo "IS_PR=$IS_PR" >> $GITHUB_OUTPUT
          # Define a unique, random delimiter for the main context block
          CONTEXT_DELIMITER="GH_CONTEXT_DELIMITER_$(openssl rand -hex 8)"
          # Fetch and Format Context based on type
          if [[ "$IS_PR" == "true" ]]; then
            # Fetch PR data
            pr_json=$(gh pr view ${{ env.THREAD_NUMBER }} --repo ${{ github.repository }} --json author,title,body,createdAt,state,headRefName,baseRefName,headRefOid,additions,deletions,commits,files,closingIssuesReferences,headRepository)

            # Debug: Output pr_json and review_comments_json for inspection
            echo "$pr_json" > pr_json.txt

            # Fetch timeline data to find cross-references
            timeline_data=$(gh api "/repos/${{ github.repository }}/issues/${{ env.THREAD_NUMBER }}/timeline")

            repo_owner="${GITHUB_REPOSITORY%/*}"
            repo_name="${GITHUB_REPOSITORY#*/}"
            GRAPHQL_QUERY='query($owner:String!, $name:String!, $number:Int!, $commentLimit:Int!, $reviewLimit:Int!, $threadLimit:Int!, $threadCommentLimit:Int!) {
              repository(owner: $owner, name: $name) {
                pullRequest(number: $number) {
                  comments(last: $commentLimit) {
                    nodes {
                      databaseId
                      author { login }
                      body
                      createdAt
                      isMinimized
                      minimizedReason
                    }
                  }
                  reviews(last: $reviewLimit) {
                    nodes {
                      databaseId
                      author { login }
                      body
                      state
                      submittedAt
                      isMinimized
                      minimizedReason
                    }
                  }
                  reviewThreads(last: $threadLimit) {
                    nodes {
                      id
                      isResolved
                      isOutdated
                      comments(last: $threadCommentLimit) {
                        nodes {
                          databaseId
                          author { login }
                          body
                          createdAt
                          path
                          line
                          originalLine
                          diffHunk
                          isMinimized
                          minimizedReason
                          pullRequestReview {
                            databaseId
                            isMinimized
                            minimizedReason
                          }
                        }
                      }
                    }
                  }
                }
              }
            }'

            discussion_data=$(gh api graphql \
              -F owner="$repo_owner" \
              -F name="$repo_name" \
              -F number=${{ env.THREAD_NUMBER }} \
              -F commentLimit=${{ env.COMMENT_FETCH_LIMIT }} \
              -F reviewLimit=${{ env.REVIEW_FETCH_LIMIT }} \
              -F threadLimit=${{ env.REVIEW_THREAD_FETCH_LIMIT }} \
              -F threadCommentLimit=${{ env.THREAD_COMMENT_FETCH_LIMIT }} \
              -f query="$GRAPHQL_QUERY")

            echo "$discussion_data" > discussion_data.txt
            
            # For prompt context
            echo "PR_HEAD_SHA=$(echo "$pr_json" | jq -r .headRefOid)" >> $GITHUB_ENV
            echo "THREAD_AUTHOR=$(echo "$pr_json" | jq -r .author.login)" >> $GITHUB_ENV
            echo "BASE_BRANCH=$(echo "$pr_json" | jq -r .baseRefName)" >> $GITHUB_ENV
            # Prepare all variables from JSON
            author=$(echo "$pr_json" | jq -r .author.login)
            created_at=$(echo "$pr_json" | jq -r .createdAt)
            base_branch=$(echo "$pr_json" | jq -r .baseRefName)
            head_branch=$(echo "$pr_json" | jq -r .headRefName)
            state=$(echo "$pr_json" | jq -r .state)
            additions=$(echo "$pr_json" | jq -r .additions)
            deletions=$(echo "$pr_json" | jq -r .deletions)
            total_commits=$(echo "$pr_json" | jq -r '.commits | length')
            changed_files_count=$(echo "$pr_json" | jq -r '.files | length')
            title=$(echo "$pr_json" | jq -r .title)
            body=$(echo "$pr_json" | jq -r '.body // "(No description provided)"')
            # Prepare changed files list
            # Build changed files list with correct jq interpolations for additions and deletions
            # Previous pattern had a missing backslash before the deletions interpolation, leaving a literal '((.deletions))'.
            changed_files_list=$(echo "$pr_json" | jq -r '.files[] | "- \(.path) (MODIFIED) +\((.additions))/-\((.deletions))"')
            # Prepare general PR comments (exclude ignored bots)
            comments=$(echo "$discussion_data" | jq -r --argjson ignored "$IGNORE_BOT_NAMES_JSON" '
              ((.data.repository.pullRequest.comments.nodes // [])
                | map(select((.isMinimized != true) and (((.author.login? // "unknown") as $login | $ignored | index($login)) | not))))
              | if length > 0 then
                  map("- " + (.author.login? // "unknown") + " at " + (.createdAt // "N/A") + ":\n" + ((.body // "") | tostring) + "\n")
                  | join("")
                else
                  "No general comments."
                end')
            
            # ===== ACCURATE FILTERING & COUNTING (Fixed math logic) =====
            
            stats_json=$(echo "$discussion_data" | jq -r --argjson ignored "$IGNORE_BOT_NAMES_JSON" '
              # Define filter logic
              def is_valid_review:
                (.author.login? // "unknown") as $login | $ignored | index($login) | not
                and (.isMinimized != true);
              
              def is_valid_comment:
                 .isResolved != true 
                 and .isOutdated != true
                 and (((.comments.nodes // []) | first | .isMinimized) != true)
                 and ((((.comments.nodes // []) | first | .pullRequestReview.isMinimized) // false) != true);
              
              def is_valid_inline:
                .isMinimized != true
                and ((.pullRequestReview.isMinimized // false) != true)
                and (((.author.login? // "unknown") as $login | $ignored | index($login)) | not);

              # Calculate Reviews
              def raw_reviews: (.data.repository.pullRequest.reviews.nodes // []);
              def total_reviews: (raw_reviews | length);
              def included_reviews: ([raw_reviews[]? | select(is_valid_review)] | length);

              # Calculate Review Comments
              def raw_threads: (.data.repository.pullRequest.reviewThreads.nodes // []);
              def valid_threads: (raw_threads | map(select(is_valid_comment)));
              def all_valid_comments: (valid_threads | map(.comments.nodes // []) | flatten | map(select(is_valid_inline)));
              
              # We count total comments as "active/unresolved threads comments"
              def total_review_comments: (raw_threads | map(select(.isResolved != true and .isOutdated != true)) | map(.comments.nodes // []) | flatten | length);
              def included_review_comments: (all_valid_comments | length);

              {
                total_reviews: total_reviews,
                included_reviews: included_reviews,
                excluded_reviews: (total_reviews - included_reviews),
                total_review_comments: total_review_comments,
                included_review_comments: included_review_comments,
                excluded_comments: (total_review_comments - included_review_comments)
              }
            ')
            
            # Export stats to env vars
            filtered_reviews=$(echo "$stats_json" | jq .included_reviews)
            excluded_reviews=$(echo "$stats_json" | jq .excluded_reviews)
            filtered_comments=$(echo "$stats_json" | jq .included_review_comments)
            excluded_comments=$(echo "$stats_json" | jq .excluded_comments)
            
            echo "✓ Filtered reviews: $filtered_reviews included, $excluded_reviews excluded (ignored bots/hidden)"
            echo "✓ Filtered review comments: $filtered_comments included, $excluded_comments excluded (outdated/hidden)"
            
            # Reviews Text
            review_filter_err=$(mktemp 2>/dev/null || echo "/tmp/review_filter_err.log")
            if reviews=$(echo "$discussion_data" | jq -r --argjson ignored "$IGNORE_BOT_NAMES_JSON" '
              if ((((.data.repository.pullRequest.reviews.nodes // []) | length) > 0)) then 
                ((.data.repository.pullRequest.reviews.nodes // [])[]? 
                | select(
                    ((.author.login? // "unknown") as $login | $ignored | index($login) | not)
                    and (.isMinimized != true)
                  ) 
                | "- " + (.author.login? // "unknown") + " at " + (.submittedAt // "N/A") + ":\n - Review body: " + (.body // "(No summary comment)") + "\n - State: " + (.state // "UNKNOWN") + "\n") 
              else 
                "No formal reviews." 
              end' 2>"$review_filter_err"); then
               if [ -s "$review_filter_err" ]; then
                 echo "::debug::jq stderr (reviews) emitted output:" 
                 cat "$review_filter_err"
               fi
            else
               echo "::warning::Review formatting failed, using unfiltered data"
               reviews="Error processing reviews."
               echo "FILTER_ERROR_REVIEWS=true" >> $GITHUB_ENV
            fi
            rm -f "$review_filter_err" || true
            
            # Review Comments Text
            review_comment_filter_err=$(mktemp 2>/dev/null || echo "/tmp/review_comment_filter_err.log")
            if review_comments=$(echo "$discussion_data" | jq -r --argjson ignored "$IGNORE_BOT_NAMES_JSON" '
              ((.data.repository.pullRequest.reviewThreads.nodes // [])
                | map(select(
                    .isResolved != true and .isOutdated != true
                    and (((.comments.nodes // []) | first | .isMinimized) != true)
                    and ((((.comments.nodes // []) | first | .pullRequestReview.isMinimized) // false) != true)
                  ))
                | map(.comments.nodes // [])
                | flatten
                | map(select((.isMinimized != true)
                             and ((.pullRequestReview.isMinimized // false) != true)
                             and (((.author.login? // "unknown") as $login | $ignored | index($login)) | not))))
              | if length > 0 then
                  map("- " + (.author.login? // "unknown") + " at " + (.createdAt // "N/A") + " (" + (.path // "Unknown file") + ":" + ((.line // .originalLine // "N/A") | tostring) + "):\n   " + ((.body // "") | tostring) + "\n")
                  | join("")
                else
                  "No inline review comments."
                end' 2>"$review_comment_filter_err"); then
               if [ -s "$review_comment_filter_err" ]; then
                 echo "::debug::jq stderr (review comments) emitted output:"
                 cat "$review_comment_filter_err"
               fi
            else
               echo "::warning::Review comment formatting failed"
               review_comments="Error processing review comments."
               echo "FILTER_ERROR_COMMENTS=true" >> $GITHUB_ENV
            fi
            rm -f "$review_comment_filter_err" || true
            
            # Store filtering statistics
            echo "EXCLUDED_REVIEWS=$excluded_reviews" >> $GITHUB_ENV
            echo "EXCLUDED_COMMENTS=$excluded_comments" >> $GITHUB_ENV

            # Build filtering summary
            filter_summary="Context filtering applied: ${excluded_reviews:-0} reviews and ${excluded_comments:-0} review comments excluded from this context."
            if [ "${FILTER_ERROR_REVIEWS}" = "true" ] || [ "${FILTER_ERROR_COMMENTS}" = "true" ]; then
              filter_summary="$filter_summary"$'\n'"Warning: Some filtering operations encountered errors. Context may include items that should have been filtered."
            fi

            # Prepare linked issues robustly by fetching each one individually.
            linked_issues_content=""
            issue_numbers=$(echo "$pr_json" | jq -r '.closingIssuesReferences[].number')

            if [ -z "$issue_numbers" ]; then
              linked_issues="No issues are formally linked for closure by this PR."
            else
              for number in $issue_numbers; do
                # Fetch each issue's data separately. This is more reliable for cross-repo issues or permission nuances.
                issue_details_json=$(gh issue view "$number" --repo "${{ github.repository }}" --json title,body 2>/dev/null || echo "{}")
                
                issue_title=$(echo "$issue_details_json" | jq -r '.title // "Title not available"')
                issue_body=$(echo "$issue_details_json" | jq -r '.body // "Body not available"')
                linked_issues_content+=$(printf "<issue>\n <number>#%s</number>\n <title>%s</title>\n <body>\n%s\n</body>\n</issue>\n" "$number" "$issue_title" "$issue_body")
              done
              linked_issues=$linked_issues_content
            fi

            # Prepare cross-references from timeline data
            references=$(echo "$timeline_data" | jq -r '.[] | select(.event == "cross-referenced") | .source.issue | "- Mentioned in \(.html_url | if contains("/pull/") then "PR" else "Issue" end): #\(.number) - \(.title)"')
            if [ -z "$references" ]; then references="This PR has not been mentioned in other issues or PRs."; fi
            
            # Step 1: Write the header for the multi-line environment variable
            echo "THREAD_CONTEXT<<$CONTEXT_DELIMITER" >> "$GITHUB_ENV"
            # Step 2: Append the content line by line
            echo "Type: Pull Request" >> "$GITHUB_ENV"
            echo "PR Number: #${{ env.THREAD_NUMBER }}" >> "$GITHUB_ENV"
            echo "Title: $title" >> "$GITHUB_ENV"
            echo "Author: $author" >> "$GITHUB_ENV"
            echo "Created At: $created_at" >> "$GITHUB_ENV"
            echo "Base Branch (target): $base_branch" >> "$GITHUB_ENV"
            echo "Head Branch (source): $head_branch" >> "$GITHUB_ENV"
            echo "State: $state" >> "$GITHUB_ENV"
            echo "Additions: $additions" >> "$GITHUB_ENV"
            echo "Deletions: $deletions" >> "$GITHUB_ENV"
            echo "Total Commits: $total_commits" >> "$GITHUB_ENV"
            echo "Changed Files: $changed_files_count files" >> "$GITHUB_ENV"
            echo "<pull_request_body>" >> "$GITHUB_ENV"
            echo "$title" >> "$GITHUB_ENV"
            echo "---" >> "$GITHUB_ENV"
            echo "$body" >> "$GITHUB_ENV"
            echo "</pull_request_body>" >> "$GITHUB_ENV"
            echo "<pull_request_comments>" >> "$GITHUB_ENV"
            echo "$comments" >> "$GITHUB_ENV"
            echo "</pull_request_comments>" >> "$GITHUB_ENV"
            echo "<pull_request_reviews>" >> "$GITHUB_ENV"
            echo "$reviews" >> "$GITHUB_ENV"
            echo "</pull_request_reviews>" >> "$GITHUB_ENV"
            echo "<pull_request_review_comments>" >> "$GITHUB_ENV"
            echo "$review_comments" >> "$GITHUB_ENV"
            echo "</pull_request_review_comments>" >> "$GITHUB_ENV"
            echo "<pull_request_changed_files>" >> "$GITHUB_ENV"
            echo "$changed_files_list" >> "$GITHUB_ENV"
            echo "</pull_request_changed_files>" >> "$GITHUB_ENV"
            echo "<linked_issues>" >> "$GITHUB_ENV"
            echo "$linked_issues" >> "$GITHUB_ENV"
            echo "</linked_issues>" >> "$GITHUB_ENV"

            # Step 3: Write the closing delimiter
            # Add cross-references and filtering summary to the final context
            echo "<cross_references>" >> "$GITHUB_ENV"
            echo "$references" >> "$GITHUB_ENV"
            echo "</cross_references>" >> "$GITHUB_ENV"
            echo "<filtering_summary>" >> "$GITHUB_ENV"
            echo "$filter_summary" >> "$GITHUB_ENV"
            echo "</filtering_summary>" >> "$GITHUB_ENV"

            echo "$CONTEXT_DELIMITER" >> "$GITHUB_ENV"
          else # It's an Issue
            issue_data=$(gh issue view ${{ env.THREAD_NUMBER }} --repo ${{ github.repository }} --json author,title,body,createdAt,state,comments)
            timeline_data=$(gh api "/repos/${{ github.repository }}/issues/${{ env.THREAD_NUMBER }}/timeline")
            echo "THREAD_AUTHOR=$(echo "$issue_data" | jq -r .author.login)" >> $GITHUB_ENV
            # Prepare metadata
            author=$(echo "$issue_data" | jq -r .author.login)
            created_at=$(echo "$issue_data" | jq -r .createdAt)
            state=$(echo "$issue_data" | jq -r .state)
            title=$(echo "$issue_data" | jq -r .title)
            body=$(echo "$issue_data" | jq -r '.body // "(No description provided)"')
            # Prepare comments (exclude ignored bots)
            comments=$(echo "$issue_data" | jq -r --argjson ignored "$IGNORE_BOT_NAMES_JSON" 'if (((.comments // []) | length) > 0) then ((.comments[]? | select((.author.login as $login | $ignored | index($login)) | not)) | "- " + (.author.login // "unknown") + " at " + (.createdAt // "N/A") + ":\n" + ((.body // "") | tostring) + "\n") else "No comments have been posted yet." end')

            # Prepare cross-references
            references=$(echo "$timeline_data" | jq -r '.[] | select(.event == "cross-referenced") | .source.issue | "- Mentioned in \(.html_url | if contains("/pull/") then "PR" else "Issue" end): #\(.number) - \(.title)"')
            if [ -z "$references" ]; then references="No other issues or PRs have mentioned this thread."; fi

            # Step 1: Write the header
            echo "THREAD_CONTEXT<<$CONTEXT_DELIMITER" >> "$GITHUB_ENV"
            # Step 2: Append the content line by line
            echo "Type: Issue" >> "$GITHUB_ENV"
            echo "Issue Number: #${{ env.THREAD_NUMBER }}" >> "$GITHUB_ENV"
            echo "Title: $title" >> "$GITHUB_ENV"
            echo "Author: $author" >> "$GITHUB_ENV"
            echo "Created At: $created_at" >> "$GITHUB_ENV"
            echo "State: $state" >> "$GITHUB_ENV"
            echo "<issue_body>" >> "$GITHUB_ENV"
            echo "$body" >> "$GITHUB_ENV"
            echo "</issue_body>" >> "$GITHUB_ENV"
            echo "<issue_comments>" >> "$GITHUB_ENV"
            echo "$comments" >> "$GITHUB_ENV"
            echo "</issue_comments>" >> "$GITHUB_ENV"
            echo "<cross_references>" >> "$GITHUB_ENV"
            echo "$references" >> "$GITHUB_ENV"
            echo "</cross_references>" >> "$GITHUB_ENV"
            # Step 3: Write the footer
            echo "$CONTEXT_DELIMITER" >> "$GITHUB_ENV"
          fi

      - name: Clear pending bot review
        if: steps.context.outputs.IS_PR == 'true'
        env:
          GH_TOKEN: ${{ steps.setup.outputs.token }}
          BOT_NAMES_JSON: ${{ env.BOT_NAMES_JSON }}
        run: |
          pending_review_ids=$(gh api --paginate \
            "/repos/${GITHUB_REPOSITORY}/pulls/${{ env.THREAD_NUMBER }}/reviews" \
            | jq -r --argjson bots "$BOT_NAMES_JSON" '.[]? | select((.state // "") == "PENDING" and (((.user.login // "") as $login | $bots | index($login)))) | .id' \
            | sort -u)

          if [ -z "$pending_review_ids" ]; then
            echo "No pending bot reviews to clear."
            exit 0
          fi

          while IFS= read -r review_id; do
            [ -z "$review_id" ] && continue
            if gh api \
              --method DELETE \
              -H "Accept: application/vnd.github+json" \
              "/repos/${GITHUB_REPOSITORY}/pulls/${{ env.THREAD_NUMBER }}/reviews/$review_id"; then
              echo "Cleared pending review $review_id"
            else
              echo "::warning::Failed to clear pending review $review_id"
            fi
          done <<< "$pending_review_ids"

      - name: Determine Review Type and Last Reviewed SHA
        if: steps.context.outputs.IS_PR == 'true'
        id: review_type
        env:
          GH_TOKEN: ${{ steps.setup.outputs.token }}
          BOT_NAMES_JSON: ${{ env.BOT_NAMES_JSON }}
        run: |
          pr_summary_payload=$(gh pr view ${{ env.THREAD_NUMBER }} --repo ${{ github.repository }} --json comments,reviews)
          detect_json=$(echo "$pr_summary_payload" | jq -c --argjson bots "$BOT_NAMES_JSON" '
            def ts(x): if (x//""=="") then null else x end;
            def items:
              [ (.comments[]? | select(.author.login as $a | $bots | index($a)) | {type:"comment", body:(.body//""), ts:(.updatedAt // .createdAt // "")} ),
                (.reviews[]?  | select(.author.login as $a | $bots | index($a)) | {type:"review",  body:(.body//""), ts:(.submittedAt // .updatedAt // .createdAt // "")} )
              ] | sort_by(.ts) | .;
            def has_phrase: (.body//"") | test("This review was generated by an AI assistant\\.?");
            def has_marker: (.body//"") | test("<!--\\s*last_reviewed_sha:[a-f0-9]{7,40}\\s*-->");
            { latest_phrase: (items | map(select(has_phrase)) | last // {}),
              latest_marker: (items | map(select(has_marker)) | last // {}) }
          ')
          latest_phrase_ts=$(echo "$detect_json" | jq -r '.latest_phrase.ts // ""')
          latest_marker_ts=$(echo "$detect_json" | jq -r '.latest_marker.ts // ""')
          latest_marker_body=$(echo "$detect_json" | jq -r '.latest_marker.body // ""')
          echo "is_first_review=false" >> $GITHUB_OUTPUT
          resolved_sha=""
          if [ -z "$latest_phrase_ts" ] && [ -z "$latest_marker_ts" ]; then
            echo "is_first_review=true" >> $GITHUB_OUTPUT
          fi
          if [ -n "$latest_marker_ts" ] && { [ -z "$latest_phrase_ts" ] || [ "$latest_marker_ts" \> "$latest_phrase_ts" ] || [ "$latest_marker_ts" = "$latest_phrase_ts" ]; }; then
            resolved_sha=$(printf "%s" "$latest_marker_body" | sed -nE 's/.*<!--\s*last_reviewed_sha:([a-f0-9]{7,40})\s*-->.*/\1/p' | head -n1)
          fi
          if [ -z "$resolved_sha" ] && [ -n "$latest_phrase_ts" ]; then
            reviews_json=$(gh api "/repos/${{ github.repository }}/pulls/${{ env.THREAD_NUMBER }}/reviews" || echo '[]')
            resolved_sha=$(echo "$reviews_json" | jq -r --argjson bots "$BOT_NAMES_JSON" '[.[] | select((.user.login // "") as $u | $bots | index($u)) | .commit_id] | last // ""')
          fi
          if [ -n "$resolved_sha" ]; then
            echo "last_reviewed_sha=$resolved_sha" >> $GITHUB_OUTPUT
            echo "$resolved_sha" > last_review_sha.txt
          else
            echo "last_reviewed_sha=" >> $GITHUB_OUTPUT
            echo "" > last_review_sha.txt
          fi

      - name: Save secure prompt from base branch
        run: cp .github/prompts/bot-reply.md /tmp/bot-reply.md

      - name: Checkout PR head
        if: steps.context.outputs.IS_PR == 'true'
        uses: actions/checkout@v4
        with:
          ref: ${{ env.PR_HEAD_SHA }}
          token: ${{ steps.setup.outputs.token }}
          fetch-depth: 0  # Full history needed for git operations and code analysis

      - name: Generate PR Diffs (Full and Incremental)
        if: steps.context.outputs.IS_PR == 'true'
        id: generate_diffs
        env:
          BASE_BRANCH: ${{ env.BASE_BRANCH }}
        run: |
          mkdir -p "$GITHUB_WORKSPACE/.mirrobot_files"
          BASE_BRANCH="${BASE_BRANCH}"
          CURRENT_SHA="${PR_HEAD_SHA}"
          LAST_SHA="${{ steps.review_type.outputs.last_reviewed_sha }}"
          
          # Always generate full diff against base branch
          echo "Generating full PR diff against base branch: $BASE_BRANCH"
          if git fetch origin "$BASE_BRANCH":refs/remotes/origin/"$BASE_BRANCH" 2>/dev/null; then
            if MERGE_BASE=$(git merge-base origin/"$BASE_BRANCH" "$CURRENT_SHA" 2>/dev/null); then
              if DIFF_CONTENT=$(git diff --patch "$MERGE_BASE".."$CURRENT_SHA" 2>/dev/null); then
                DIFF_SIZE=${#DIFF_CONTENT}
                if [ $DIFF_SIZE -gt 500000 ]; then
                  TRUNCATION_MSG=$'\n\n[DIFF TRUNCATED - PR is very large. Showing first 500KB only. Review scaled to high-impact areas.]'
                  DIFF_CONTENT="${DIFF_CONTENT:0:500000}${TRUNCATION_MSG}"
                fi
                echo "$DIFF_CONTENT" > "$GITHUB_WORKSPACE/.mirrobot_files/first_review_diff.txt"
                echo "Full diff generated ($(echo "$DIFF_CONTENT" | wc -l) lines)"
              else
                echo "(Diff generation failed. Please refer to the changed files list above.)" > "$GITHUB_WORKSPACE/.mirrobot_files/first_review_diff.txt"
              fi
            else
              echo "(No common ancestor found. This might be a new branch or orphaned commits.)" > "$GITHUB_WORKSPACE/.mirrobot_files/first_review_diff.txt"
            fi
          else
            echo "(Base branch not available for diff. Please refer to the changed files list above.)" > "$GITHUB_WORKSPACE/.mirrobot_files/first_review_diff.txt"
          fi
          
          # Generate incremental diff if this is a follow-up review
          if [ -n "$LAST_SHA" ]; then
            echo "Generating incremental diff from $LAST_SHA to $CURRENT_SHA"
            if git fetch origin $LAST_SHA 2>/dev/null || git cat-file -e $LAST_SHA^{commit} 2>/dev/null; then
              if DIFF_CONTENT=$(git diff --patch $LAST_SHA..$CURRENT_SHA 2>/dev/null); then
                DIFF_SIZE=${#DIFF_CONTENT}
                if [ $DIFF_SIZE -gt 500000 ]; then
                  TRUNCATION_MSG=$'\n\n[DIFF TRUNCATED - Changes are very large. Showing first 500KB only.]'
                  DIFF_CONTENT="${DIFF_CONTENT:0:500000}${TRUNCATION_MSG}"
                fi
                echo "$DIFF_CONTENT" > "$GITHUB_WORKSPACE/.mirrobot_files/incremental_diff.txt"
                echo "Incremental diff generated ($(echo "$DIFF_CONTENT" | wc -l) lines)"
              else
                echo "(Unable to generate incremental diff.)" > "$GITHUB_WORKSPACE/.mirrobot_files/incremental_diff.txt"
              fi
            else
              echo "(Last reviewed SHA not accessible for incremental diff.)" > "$GITHUB_WORKSPACE/.mirrobot_files/incremental_diff.txt"
            fi
          else
            echo "(No previous review - incremental diff not applicable.)" > "$GITHUB_WORKSPACE/.mirrobot_files/incremental_diff.txt"
          fi

      - name: Checkout repository (for issues)
        if: steps.context.outputs.IS_PR == 'false'
        uses: actions/checkout@v4
        with:
          token: ${{ steps.setup.outputs.token }}
          fetch-depth: 0  # Full history needed for git operations and code analysis

      - name: Analyze comment and respond
        env:
          GITHUB_TOKEN: ${{ steps.setup.outputs.token }}
          THREAD_CONTEXT: ${{ env.THREAD_CONTEXT }}
          NEW_COMMENT_AUTHOR: ${{ env.NEW_COMMENT_AUTHOR }}
          NEW_COMMENT_BODY: ${{ env.NEW_COMMENT_BODY }}
          THREAD_NUMBER: ${{ env.THREAD_NUMBER }}
          GITHUB_REPOSITORY: ${{ github.repository }}
          THREAD_AUTHOR: ${{ env.THREAD_AUTHOR }}
          PR_HEAD_SHA: ${{ env.PR_HEAD_SHA }}
          IS_FIRST_REVIEW: ${{ steps.review_type.outputs.is_first_review }}
          OPENCODE_PERMISSION: |
            {
              "bash": {
                "gh*": "allow",
                "git*": "allow",
                "jq*": "allow"
              },
              "external_directory": "allow",
              "webfetch": "deny"
            }
        run: |
            # Only substitute the variables we intend; leave example $vars and secrets intact
            if [ "${{ steps.context.outputs.IS_PR }}" = "true" ]; then
              FULL_DIFF_PATH="$GITHUB_WORKSPACE/.mirrobot_files/first_review_diff.txt"
              INCREMENTAL_DIFF_PATH="$GITHUB_WORKSPACE/.mirrobot_files/incremental_diff.txt"
              LAST_REVIEWED_SHA="${{ steps.review_type.outputs.last_reviewed_sha }}"
            else
              FULL_DIFF_PATH=""
              INCREMENTAL_DIFF_PATH=""
              LAST_REVIEWED_SHA=""
            fi
            VARS='$THREAD_CONTEXT $NEW_COMMENT_AUTHOR $NEW_COMMENT_BODY $THREAD_NUMBER $GITHUB_REPOSITORY $THREAD_AUTHOR $PR_HEAD_SHA $IS_FIRST_REVIEW $FULL_DIFF_PATH $INCREMENTAL_DIFF_PATH $LAST_REVIEWED_SHA'
            FULL_DIFF_PATH="$FULL_DIFF_PATH" INCREMENTAL_DIFF_PATH="$INCREMENTAL_DIFF_PATH" LAST_REVIEWED_SHA="$LAST_REVIEWED_SHA" envsubst "$VARS" < /tmp/bot-reply.md | opencode run --share -