#!/usr/bin/env bash
# -----------------------------------------------------------------------------
# ObsiGate — version bump helper (SemVer MAJOR.MINOR.PATCH)
#
# The canonical version is the latest release tag. This tool inspects the
# commits since that tag and decides the next version from their type
# (Conventional Commits), then creates and pushes the new tag:
#
#   breaking change / `!:` / "BREAKING CHANGE"  ->  MAJOR bump  (x.0.0)
#   feat / feature                              ->  MINOR bump  (x.y.0)
#   anything else (fix, perf, refactor, ...)    ->  PATCH bump  (x.y.z)
#
# Usage:
#   scripts/bump_version.sh [--major|--minor|--patch] [--dry-run] [--push]
#
#   --dry-run : only print the computed next version, do not tag.
#   --push    : also `git push origin` the new tag (default: local only).
#   --major|--minor|--patch : force the increment, overriding commit detection.
#
# Examples:
#   scripts/bump_version.sh --dry-run            # preview next version
#   scripts/bump_version.sh                       # tag locally per commits
#   scripts/bump_version.sh --patch --push        # force patch + push
# -----------------------------------------------------------------------------
set -euo pipefail

cd "$(git rev-parse --show-toplevel)"   # run from repo root regardless of cwd
BRANCH="$(git branch --show-current)"

# ── Parse args ────────────────────────────────────────────────────────────
FORCE=""; DRY_RUN=0; DO_PUSH=0
for a in "$@"; do
  case "$a" in
    --major) FORCE=major ;;
    --minor) FORCE=minor ;;
    --patch) FORCE=patch ;;
    --dry-run) DRY_RUN=1 ;;
    --push) DO_PUSH=1 ;;
    *) echo "✗ Argument inconnu: $a"; exit 2 ;;
  esac
done

# ── Current version = latest tag base ─────────────────────────────────────
CURRENT="$(git describe --tags --abbrev=0 2>/dev/null || echo "0.0.0")"
CURRENT="${CURRENT#v}"
IFS='.' read -r MAJ MIN PAT <<< "$CURRENT"
MAJ="${MAJ:-0}"; MIN="${MIN:-0}"; PAT="${PAT:-0}"

echo "Version actuelle : $CURRENT  (branche: $BRANCH)"

# ── Detect bump type from commits since last tag ──────────────────────────
if [ -z "$FORCE" ]; then
  # Use HEAD~1..HEAD when no tag exists yet (all commits "since" nothing).
  RANGE="${CURRENT#0.0.0}" # if 0.0.0 fallback there may be no tag at all
  if git rev-parse "v${CURRENT}" >/dev/null 2>&1; then
    RANGE="v${CURRENT}..HEAD"
  else
    RANGE="HEAD~10..HEAD"
    echo "⚠ Aucun tag v${CURRENT} trouvé — analyse des 10 derniers commits."
  fi
  LOG="$(git log --format='%s%n%b' "$RANGE" 2>/dev/null || true)"

  BUMP="patch"   # default
  if echo "$LOG" | grep -qE '^[a-zA-Z]+\([^)]*\)!:|\!:\s|BREAKING CHANGE:'; then
    BUMP="major"
  elif echo "$LOG" | grep -qiE '^(feat|feature)(\(|:|\s)'; then
    BUMP="minor"
  fi
  # If nothing meaningful in range, keep patch
  echo "Détection (${RANGE}) : changement ${BUMP}"
else
  BUMP="$FORCE"
  echo "Incrément forcé  : ${BUMP}"
fi

# ── Compute next version ──────────────────────────────────────────────────
case "$BUMP" in
  major) MAJ=$((MAJ + 1)); MIN=0; PAT=0 ;;
  minor) MIN=$((MIN + 1)); PAT=0 ;;
  *)     PAT=$((PAT + 1)) ;;
esac
NEXT="${MAJ}.${MIN}.${PAT}"

# ── Guard: tag already exists? ────────────────────────────────────────────
if git rev-parse "v${NEXT}" >/dev/null 2>&1; then
  echo "✗ Le tag v${NEXT} existe déjà. Corrigez l'incrément ou retirez le tag."
  exit 1
fi

if [ "$DRY_RUN" = "1" ]; then
  echo "── DRY RUN ─────────────────────────────"
  echo "   Prochain tag : v${NEXT}"
  echo "   (aucun tag créé)"
  exit 0
fi

# ── Create tag ────────────────────────────────────────────────────────────
git tag -a "v${NEXT}" -m "Release v${NEXT} (${BUMP} bump depuis v${CURRENT})"
echo "✓ Tag créé localement : v${NEXT}"

if [ "$DO_PUSH" = "1" ]; then
  git push origin "v${NEXT}"
  echo "✓ Tag poussé : v${NEXT}"
else
  echo "ℹ Tag local uniquement. Poussez avec: git push origin v${NEXT}"
fi

echo "Done."