#!/bin/bash

set -e

current_branch=$(git branch --show-current)

if [ -z "$current_branch" ]; then
  echo "Erreur : impossible de détecter la branche courante."
  exit 1
fi

if [ "$current_branch" = "main" ]; then
  echo "Erreur : ce script ne peut pas être exécuté depuis la branche main."
  exit 1
fi

start_branch="$current_branch"

cleanup() {
  if [ "$(git branch --show-current)" != "$start_branch" ]; then
    git checkout "$start_branch" >/dev/null 2>&1 || true
  fi
}

merge_or_fail() {
  source_branch="$1"
  target_branch="$2"

  if ! git merge "$source_branch"; then
    echo "Erreur : conflit lors du merge de $source_branch vers $target_branch."
    echo "Résolvez les conflits manuellement, puis relancez le script."
    exit 1
  fi
}

trap cleanup EXIT

echo "Branche courante détectée : $current_branch"
read -r -p "Confirmer l'exécution sur cette branche ? [y/N] " confirm
case "$confirm" in
  y|Y|yes|YES)
    ;;
  *)
    echo "Annulé."
    exit 1
    ;;
esac

if [ "$current_branch" != "dev" ]; then
  git checkout dev
  merge_or_fail "$current_branch" "dev"
  git push
  current_branch="dev"
fi

git checkout main
merge_or_fail dev main
git push
git checkout dev