#!/usr/bin/env bash
set -euo pipefail

ROOT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")/../.." && pwd)"
cd "$ROOT_DIR"

DRY_RUN=1
APPLY=0
TARGETS="github,gitea"
COMMIT_MSG="docs: sync consolidation and session starter"

usage() {
  cat <<'USAGE'
Usage:
  bash scripts/docs/docs_sync.sh [--dry-run] [--apply] [--targets github,gitea] [--message "..."]

Behavior:
  - default mode is --dry-run (prints actions only)
  - --apply performs git add/commit/push for selected targets
  - targets values: github,gitea

Safety:
  - refuses to apply with unstaged non-doc changes in index
  - only stages docs-related paths by default
USAGE
}

while [[ $# -gt 0 ]]; do
  case "$1" in
    --dry-run)
      DRY_RUN=1
      APPLY=0
      shift
      ;;
    --apply)
      APPLY=1
      DRY_RUN=0
      shift
      ;;
    --targets)
      TARGETS="$2"
      shift 2
      ;;
    --message)
      COMMIT_MSG="$2"
      shift 2
      ;;
    -h|--help)
      usage
      exit 0
      ;;
    *)
      echo "Unknown arg: $1" >&2
      usage
      exit 2
      ;;
  esac
done

if [[ "$APPLY" -eq 1 ]]; then
  # Prevent accidental mix with staged non-doc changes.
  staged_non_doc="$(git diff --cached --name-only | rg -v '^(docs/|scripts/docs/|PROJECT-MASTER-INDEX.md$|NODA1-SAFE-DEPLOY.md$|config/README.md$)' || true)"
  if [[ -n "$staged_non_doc" ]]; then
    echo "Refusing --apply: staged non-doc files detected:" >&2
    echo "$staged_non_doc" >&2
    exit 3
  fi
fi

mapfile -t GH_REMOTES < <(git remote -v | awk '/github.com/ {print $1}' | sort -u)
mapfile -t GITEA_REMOTES < <(git remote -v | awk '/gitea/ {print $1}' | sort -u)

wants_target() {
  local needle="$1"
  [[ ",$TARGETS," == *",$needle,"* ]]
}

print_remotes() {
  echo "Detected remotes:"
  echo "  github: ${GH_REMOTES[*]:-<none>}"
  echo "  gitea : ${GITEA_REMOTES[*]:-<none>}"
}

run_or_echo() {
  if [[ "$DRY_RUN" -eq 1 ]]; then
    echo "[dry-run] $*"
  else
    eval "$@"
  fi
}

print_remotes

echo "Targets: $TARGETS"
echo "Commit message: $COMMIT_MSG"

doc_paths=(
  docs/SESSION_STARTER.md
  docs/runbooks/DOCS_SERVICES_AUTOMATION_RUNBOOK.md
  docs/consolidation/README.md
  docs/consolidation/SOURCES.md
  docs/consolidation/docs_registry_curated.csv
  docs/consolidation/INTEGRATIONS_STATUS_LATEST.md
  docs/consolidation/jupyter/JUPYTER_SYNC_LATEST.md
  docs/consolidation/jupyter/notebooks_index_latest.csv
  docs/consolidation/pieces/PIECES_SYNC_LATEST.md
  docs/consolidation/pieces/pieces_index_latest.csv
  docs/backups/LATEST.txt
  docs/standards/DOCS_STYLE_GUIDE.md
  docs/standards/DOC_TEMPLATE.md
  docs/standards/lint_scope.txt
  PROJECT-MASTER-INDEX.md
  .markdownlint.yml
  .markdownlintignore
  .github/workflows/docs-lint.yml
  scripts/docs/session_bootstrap.sh
  scripts/docs/docs_backup.sh
  scripts/docs/docs_lint.sh
  scripts/docs/run_docs_maintenance.sh
  scripts/docs/install_local_cron.sh
  scripts/docs/jupyter_sync.sh
  scripts/docs/pieces_sync.sh
  scripts/docs/services_sync.sh
  scripts/docs/docs_sync.sh
)

existing_paths=()
for p in "${doc_paths[@]}"; do
  [[ -e "$p" ]] && existing_paths+=("$p")
done

if [[ "${#existing_paths[@]}" -eq 0 ]]; then
  echo "No docs paths found to sync."
  exit 0
fi

run_or_echo "git add ${existing_paths[*]}"

if [[ "$DRY_RUN" -eq 1 ]]; then
  echo "[dry-run] git diff --cached --name-status"
  git diff --cached --name-status || true
else
  if git diff --cached --quiet; then
    echo "No staged changes after add; nothing to commit."
    exit 0
  fi
  git commit -m "$COMMIT_MSG"
fi

if wants_target "github"; then
  if [[ "${#GH_REMOTES[@]}" -eq 0 ]]; then
    echo "Skip github: no matching remotes."
  else
    for r in "${GH_REMOTES[@]}"; do
      current_branch="$(git rev-parse --abbrev-ref HEAD)"
      run_or_echo "git push $r $current_branch"
    done
  fi
fi

if wants_target "gitea"; then
  if [[ "${#GITEA_REMOTES[@]}" -eq 0 ]]; then
    echo "Skip gitea: no matching remotes."
  else
    for r in "${GITEA_REMOTES[@]}"; do
      current_branch="$(git rev-parse --abbrev-ref HEAD)"
      run_or_echo "git push $r $current_branch"
    done
  fi
fi

echo "Done."