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

# Generate an automatic Git-based changelog used by Filament support page.

REPO_DIR="$(pwd)"
LEGACY_REPO_DIR="/home/michele/netgescon/netgescon-laravel"
OUTPUT_FILE="docs/NETGESCON-GIT-AUTOCHANGELOG.md"
LIMIT="180"

usage() {
  cat <<'EOF'
Usage:
  bash scripts/ops/netgescon-sync-git-changelog.sh [options]

Options:
  --repo <path>           Source repository for commit history (default: cwd)
  --legacy-repo <path>    Legacy repo for long-term milestones (default: /home/michele/netgescon/netgescon-laravel)
  --output <path>         Output markdown file (default: docs/NETGESCON-GIT-AUTOCHANGELOG.md)
  --limit <n>             Number of commits to include (default: 180)

Example:
  bash scripts/ops/netgescon-sync-git-changelog.sh --repo /home/michele/netgescon/netgescon-day0
EOF
}

while [[ $# -gt 0 ]]; do
  case "$1" in
    --repo) REPO_DIR="$2"; shift 2 ;;
    --legacy-repo) LEGACY_REPO_DIR="$2"; shift 2 ;;
    --output) OUTPUT_FILE="$2"; shift 2 ;;
    --limit) LIMIT="$2"; shift 2 ;;
    -h|--help) usage; exit 0 ;;
    *) echo "Unknown option: $1" >&2; exit 1 ;;
  esac
done

[[ -d "$REPO_DIR/.git" ]] || { echo "Repo not found: $REPO_DIR" >&2; exit 1; }

classify() {
  local msg="$1"
  local m
  m="$(printf '%s' "$msg" | tr '[:upper:]' '[:lower:]')"

  if [[ "$m" =~ ^feat(\(.+\))?: ]]; then
    echo "Aggiunto"
  elif [[ "$m" =~ ^fix(\(.+\))?: ]]; then
    echo "Risolto"
  elif [[ "$m" =~ ^perf(\(.+\))?:|^refactor(\(.+\))?: ]]; then
    echo "Migliorato"
  elif [[ "$m" =~ ^docs(\(.+\))?: ]]; then
    echo "Documentazione"
  elif [[ "$m" =~ ^chore(\(.+\))?:|^ops(\(.+\))?: ]]; then
    echo "Operativo"
  else
    echo "Aggiornato"
  fi
}

mkdir -p "$(dirname "$OUTPUT_FILE")"

{
  echo "# NetGescon Git Auto Changelog"
  echo
  echo "Generato automaticamente da Git il $(date '+%d/%m/%Y %H:%M')."
  echo
  echo "Repository sorgente: \
\`$REPO_DIR\`"
  echo
  echo "## Milestone Storico"

  if [[ -d "$LEGACY_REPO_DIR/.git" ]]; then
    first_line="$(git -C "$LEGACY_REPO_DIR" log --reverse --date=format:'%d/%m/%Y' --pretty=format:'%h|%ad|%s' | head -n 1 || true)"
    if [[ -n "$first_line" ]]; then
      IFS='|' read -r fh fd fs <<< "$first_line"
      echo "- Prima registrazione Git disponibile: **$fd** - \`$fh\` - $fs"
    fi

    if git -C "$LEGACY_REPO_DIR" cat-file -e 1448a3d^{commit} 2>/dev/null; then
      cdate="$(git -C "$LEGACY_REPO_DIR" show -s --date=format:'%d/%m/%Y' --pretty=format:'%ad' 1448a3d)"
      cmsg="$(git -C "$LEGACY_REPO_DIR" show -s --pretty=format:'%s' 1448a3d)"
      echo "- Commit storico dichiarato trovato: **$cdate** - \`1448a3d\` - $cmsg"
    else
      echo "- Commit storico dichiarato \`1448a3d\`: non presente nel repository locale corrente (possibile storico esterno)."
    fi
  else
    echo "- Repository legacy non disponibile in: \`$LEGACY_REPO_DIR\`."
  fi

  echo
  echo "## Ultimi Commit Classificati"
  echo
  echo "| Data | Commit | Tipo | Messaggio |"
  echo "| --- | --- | --- | --- |"

  git -C "$REPO_DIR" log --date=format:'%d/%m/%Y' --pretty=format:'%h|%ad|%s' -n "$LIMIT" | while IFS='|' read -r hash date msg; do
    kind="$(classify "$msg")"
    clean_msg="$(printf '%s' "$msg" | sed 's/|/-/g')"
    echo "| $date | \`$hash\` | $kind | $clean_msg |"
  done

  echo
  echo "## Uso Operativo"
  echo
  echo "1. Aggiorna il changelog automatico:"
  echo
  echo "\`\`\`bash"
  echo "bash scripts/ops/netgescon-sync-git-changelog.sh"
  echo "\`\`\`"
  echo
  echo "2. Aggiorna changelog funzionale manuale (supporto/modifiche):"
  echo
  echo "\`\`\`bash"
  echo "bash scripts/ops/netgescon-add-modifica.sh --area \"<Area>\" --desc \"<Descrizione>\" --type U"
  echo "\`\`\`"
} > "$OUTPUT_FILE"

echo "OK"
echo "GENERATED: $OUTPUT_FILE"