#!/bin/bash
# CRM SITECONSEIL - Backup script (database + files)
# Usage: /usr/local/bin/crm-siteconseil-backup.sh
# Schedule via cron (ex: every 30 minutes)

set -euo pipefail

#######################################
# Configuration
#######################################
APP_DIR="{{ app_dir | default('/var/www/crm-siteconseil') }}"
COMPOSE_FILE="${APP_DIR}/docker-compose-prod.yml"
BACKUP_DIR="{{ backup_dir | default('/var/backups/crm-siteconseil') }}"
KEEP_DAYS="{{ backup_keep_days | default(7) }}"

DB_SERVICE="{{ db_service | default('db-master') }}"
DB_USER="{{ db_user | default('crm-siteconseil') }}"
DB_NAME="{{ db_name | default('crm-siteconseil') }}"

DATE="$(date +%Y%m%d_%H%M%S)"
TARGET_DIR="${BACKUP_DIR}/${DATE}"
LOG_PREFIX="[$(date '+%Y-%m-%d %H:%M:%S')]"

#######################################
# Helpers
#######################################
log()  { echo "${LOG_PREFIX} $*"; }
fail() { echo "${LOG_PREFIX} ERROR: $*" >&2; exit 1; }

mkdir -p "${TARGET_DIR}"

#######################################
# 1. Database (PostgreSQL custom format)
#######################################
DB_FILE="${TARGET_DIR}/database.dump"
log "Dumping database ${DB_NAME} from service ${DB_SERVICE}..."

if ! docker compose -f "${COMPOSE_FILE}" exec -T "${DB_SERVICE}" \
        pg_dump -U "${DB_USER}" -d "${DB_NAME}" --format=custom --no-owner --no-acl \
        > "${DB_FILE}"; then
    fail "pg_dump failed"
fi

if [ ! -s "${DB_FILE}" ]; then
    fail "database dump is empty"
fi

log "DB Backup OK: $(du -h "${DB_FILE}" | cut -f1)"

#######################################
# 2. Files: public/uploads
#######################################
UPLOADS_FILE="${TARGET_DIR}/uploads.tar.gz"
if [ -d "${APP_DIR}/public/uploads" ]; then
    log "Archiving public/uploads..."
    if tar -czf "${UPLOADS_FILE}" -C "${APP_DIR}/public" uploads; then
        log "Uploads Backup OK: $(du -h "${UPLOADS_FILE}" | cut -f1)"
    else
        log "WARNING: uploads archive failed"
    fi
else
    log "WARNING: ${APP_DIR}/public/uploads not found, skipping"
fi

#######################################
# 3. Files: var/share (APP_SHARE_DIR)
#######################################
SHARE_FILE="${TARGET_DIR}/share.tar.gz"
if [ -d "${APP_DIR}/var/share" ]; then
    log "Archiving var/share..."
    if tar -czf "${SHARE_FILE}" -C "${APP_DIR}/var" share; then
        log "Share Backup OK: $(du -h "${SHARE_FILE}" | cut -f1)"
    else
        log "WARNING: share archive failed"
    fi
else
    log "WARNING: ${APP_DIR}/var/share not found, skipping"
fi

#######################################
# 4. Manifest
#######################################
MANIFEST="${TARGET_DIR}/manifest.txt"
{
    echo "CRM SITECONSEIL backup"
    echo "Date     : ${DATE}"
    echo "Hostname : $(hostname)"
    echo "DB       : ${DB_NAME}@${DB_SERVICE}"
    echo "Files    :"
    ls -lh "${TARGET_DIR}" | tail -n +2
} > "${MANIFEST}"

log "Backup directory: ${TARGET_DIR} ($(du -sh "${TARGET_DIR}" | cut -f1))"

#######################################
# 5. Retention (delete backups older than KEEP_DAYS)
#######################################
log "Cleaning backups older than ${KEEP_DAYS} days..."
find "${BACKUP_DIR}" -mindepth 1 -maxdepth 1 -type d -mtime "+${KEEP_DAYS}" -exec rm -rf {} +
log "Done."