#!/usr/bin/env bash

set -euo pipefail

tmp_file=$(mktemp)
trap 'rm -f "$tmp_file"' EXIT

{
  printf '%s\n' '<!-- vociferate-pr-review -->'
  printf '\n## %s\n\n' "$COMMENT_TITLE"
  printf '### Coverage\n'
  printf '![Coverage Badge](%s)\n\n' "$BADGE_URL"
  printf '**Coverage:** %s%%\n' "$COVERAGE_PCT"
} > "$tmp_file"

if [[ "$GATE_ENABLED" == "true" ]]; then
  gate_status="Pass"
  if [[ "$GATE_PASSED" != "true" ]]; then
    if [[ "$GATE_MODE" == "strict" ]]; then
      gate_status="Fail"
    else
      gate_status="Warning"
    fi
  fi

  {
    printf '\n### Changelog Gate\n'
    printf '**Status:** %s\n\n' "$gate_status"
  } >> "$tmp_file"

  if [[ "$DOCS_ONLY" == "true" ]]; then
    printf '%s\n\n' 'This PR only modifies documentation; changelog entry not required.' >> "$tmp_file"
  elif [[ "$GATE_PASSED" == "true" ]]; then
    printf 'Found %s line(s) added to Unreleased section.\n\n' "$ADDITIONS_COUNT" >> "$tmp_file"
  else
    printf '**Issue:** %s\n\n' "$FAILURE_REASON" >> "$tmp_file"
    cat >> "$tmp_file" <<'EOF'
**How to fix:** Add an entry under the appropriate subsection in the `## [Unreleased]` section of `CHANGELOG.md`. Use one of:
- `### Breaking` for backwards-incompatible changes
- `### Added` for new features
- `### Changed` for behavior changes
- `### Removed` for deprecated removals
- `### Fixed` for bug fixes

Example:
```markdown
## [Unreleased]
### Added
- New changelog gate validation for PR decoration.
```

EOF
  fi
fi

if [[ -n "$UNRELEASED" ]]; then
  {
    printf '### Unreleased Changes\n\n'
    printf '%s\n\n' "$UNRELEASED"
  } >> "$tmp_file"
fi

cat >> "$tmp_file" <<'EOF'
---
*This comment was automatically generated by [vociferate/decorate-pr](https://git.hrafn.xyz/aether/vociferate).*
EOF

delimiter="EOF_COMMENT"
printf 'comment_body<<%s\n' "$delimiter" >> "$GITHUB_OUTPUT"
cat "$tmp_file" >> "$GITHUB_OUTPUT"
printf '%s\n' "$delimiter" >> "$GITHUB_OUTPUT"