#!/bin/sh
set -eu

# ============================================================================
#  E-COSPLAY - Script de sauvegarde pour migration vers un autre serveur
# ----------------------------------------------------------------------------
#  N'UTILISE PAS DOCKER. S'appuie sur les binaires installés sur l'hôte
#  (pg_dump, psql, tar, gzip) et lit DATABASE_URL depuis .env.local.
#
#  Sauvegarde :
#    - Base PostgreSQL distante via DATABASE_URL (pg_dump logique)
#    - Fichiers uploadés (public/storage)
#    - Fichiers d'environnement et credentials (.env.local, google.json, ...)
#
#  Le tout est empaqueté dans une archive tar.gz horodatée.
# ============================================================================

RED='\033[0;31m'
ORANGE='\033[0;33m'
GREEN='\033[0;32m'
CYAN='\033[0;36m'
RESET='\033[0m'

PROJECT_DIR="$(cd "$(dirname "$0")" && pwd)"
cd "$PROJECT_DIR"

TIMESTAMP="$(date +%Y%m%d_%H%M%S)"
BACKUP_DIR="${BACKUP_DIR:-$PROJECT_DIR/var/backups}"
WORK_DIR="$BACKUP_DIR/tmp_$TIMESTAMP"
ARCHIVE="$BACKUP_DIR/e-cosplay_backup_$TIMESTAMP.tar.gz"

STORAGE_DIR="${STORAGE_DIR:-public/storage}"

echo "${CYAN}############################${RESET}"
echo "${CYAN}# E-COSPLAY BACKUP START   #${RESET}"
echo "${CYAN}############################${RESET}"
echo "${CYAN}Destination : ${ARCHIVE}${RESET}"

mkdir -p "$WORK_DIR"

# ---------------------------------------------------------------------------
# 1) Vérifications
# ---------------------------------------------------------------------------
for bin in pg_dump tar gzip; do
    if ! command -v "$bin" >/dev/null 2>&1; then
        echo "${RED}Binaire introuvable : $bin${RESET}" >&2
        exit 1
    fi
done

# ---------------------------------------------------------------------------
# 2) Récupération de DATABASE_URL
#    Priorité : variable d'env existante > .env.local > .env.prod.local > .env
# ---------------------------------------------------------------------------
get_database_url() {
    if [ -n "${DATABASE_URL:-}" ]; then
        echo "$DATABASE_URL"
        return 0
    fi
    for f in .env.local .env.prod.local .env.prod .env; do
        if [ -f "$PROJECT_DIR/$f" ]; then
            url="$(grep -E '^DATABASE_URL=' "$PROJECT_DIR/$f" | tail -n1 | sed -E 's/^DATABASE_URL=//; s/^"(.*)"$/\1/; s/^'"'"'(.*)'"'"'$/\1/')"
            if [ -n "$url" ]; then
                echo "$url"
                return 0
            fi
        fi
    done
    return 1
}

DATABASE_URL_RAW="$(get_database_url || true)"
if [ -z "$DATABASE_URL_RAW" ]; then
    echo "${RED}DATABASE_URL introuvable (ni en env, ni dans .env.local/.env)${RESET}" >&2
    exit 1
fi

# Strip des paramètres Doctrine (serverVersion, charset, ...) que libpq ignore
DATABASE_URL_CLEAN="$(echo "$DATABASE_URL_RAW" | sed -E 's/\?.*$//')"

# Affiche une URL masquée (cache le mot de passe)
DATABASE_URL_MASKED="$(echo "$DATABASE_URL_CLEAN" | sed -E 's#(://[^:]+:)[^@]+(@)#\1***\2#')"
echo "${CYAN}> DATABASE_URL : ${DATABASE_URL_MASKED}${RESET}"

# ---------------------------------------------------------------------------
# 3) Dump PostgreSQL
# ---------------------------------------------------------------------------
echo "${CYAN}> Dump PostgreSQL...${RESET}"
pg_dump "$DATABASE_URL_CLEAN" \
    --clean --if-exists --no-owner --no-privileges \
    | gzip -9 > "$WORK_DIR/database.sql.gz"
echo "${GREEN}  ✓ database.sql.gz ($(du -h "$WORK_DIR/database.sql.gz" | cut -f1))${RESET}"

# ---------------------------------------------------------------------------
# 4) Fichiers uploadés
# ---------------------------------------------------------------------------
if [ -d "$PROJECT_DIR/$STORAGE_DIR" ]; then
    echo "${CYAN}> Sauvegarde de ${STORAGE_DIR}...${RESET}"
    tar -C "$PROJECT_DIR" -czf "$WORK_DIR/storage.tar.gz" "$STORAGE_DIR"
    echo "${GREEN}  ✓ storage.tar.gz ($(du -h "$WORK_DIR/storage.tar.gz" | cut -f1))${RESET}"
else
    echo "${ORANGE}  ! ${STORAGE_DIR} introuvable, étape ignorée${RESET}"
fi

# ---------------------------------------------------------------------------
# 5) Fichiers d'environnement et credentials
# ---------------------------------------------------------------------------
echo "${CYAN}> Copie des fichiers d'environnement et credentials...${RESET}"
mkdir -p "$WORK_DIR/env"
for f in .env .env.local .env.prod .env.prod.local google.json account.json; do
    if [ -f "$PROJECT_DIR/$f" ]; then
        cp -a "$PROJECT_DIR/$f" "$WORK_DIR/env/$f"
        echo "${GREEN}  ✓ $f${RESET}"
    fi
done

# ---------------------------------------------------------------------------
# 6) Métadonnées
# ---------------------------------------------------------------------------
{
    echo "timestamp=$TIMESTAMP"
    echo "hostname=$(hostname)"
    echo "git_commit=$(git -C "$PROJECT_DIR" rev-parse HEAD 2>/dev/null || echo unknown)"
    echo "git_branch=$(git -C "$PROJECT_DIR" rev-parse --abbrev-ref HEAD 2>/dev/null || echo unknown)"
    echo "database_url=$DATABASE_URL_MASKED"
    echo "storage_dir=$STORAGE_DIR"
} > "$WORK_DIR/manifest.txt"

# ---------------------------------------------------------------------------
# 7) Empaquetage final
# ---------------------------------------------------------------------------
echo "${CYAN}> Empaquetage de l'archive finale...${RESET}"
tar -C "$BACKUP_DIR" -czf "$ARCHIVE" "tmp_$TIMESTAMP"
rm -rf "$WORK_DIR"

echo "${GREEN}############################${RESET}"
echo "${GREEN}# BACKUP TERMINÉ           #${RESET}"
echo "${GREEN}############################${RESET}"
echo "${GREEN}Archive : ${ARCHIVE}${RESET}"
echo "${GREEN}Taille  : $(du -h "$ARCHIVE" | cut -f1)${RESET}"
echo
echo "${CYAN}Pour transférer vers le nouveau serveur :${RESET}"
echo "  scp \"$ARCHIVE\" user@nouveau-serveur:/chemin/vers/e-cosplay/var/backups/"
echo "  ssh user@nouveau-serveur 'cd /chemin/vers/e-cosplay && ./restore.sh \"var/backups/$(basename "$ARCHIVE")\"'"