#!/usr/bin/env bash
# ==============================================================================
# Gitea Backup Script
# ==============================================================================
# Creates a backup archive of Gitea + PostgreSQL data and Traefik config.
#
# Hot backup (default): runs gitea dump + pg_dump while containers stay up.
# Cold backup (--cold):  stops containers, tars data, restarts.
#
# Usage:  backup-gitea.sh
#         backup-gitea.sh --cold
# ==============================================================================

set -euo pipefail

SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
source "${SCRIPT_DIR}/common.sh"
parse_args "$@"

SERVICE_NAME="gitea"
BASE_DIR="/opt/${SERVICE_NAME}"
CONFIG_NAME="${SERVICE_NAME}"
BACKUP_DIR="/opt/backup"
STAMP="$(date +%Y%m%d-%H%M%S)"
BACKUP_FILE="${BACKUP_DIR}/backup-${SERVICE_NAME}-${STAMP}.tar.gz"

[[ -d "$BASE_DIR" ]] || fatal "Gitea is not deployed at ${BASE_DIR}."

mkdir -p "$BACKUP_DIR"

# --- Hot backup: application-level dumps ---
if [[ "$ARG_COLD" != "1" ]]; then
    info "Running hot backup (containers stay up)..."

    # Gitea built-in dump
    info "Running gitea dump..."
    mkdir -p "${BASE_DIR}/gitea/data/backup"
    docker exec -u git gitea bash -c \
        '/app/gitea/gitea dump -c /data/gitea/conf/app.ini --type tar.gz -f /data/backup/gitea-dump.tar.gz' \
        2>/dev/null || warn "Gitea dump failed — archive will contain live data files only."

    # PostgreSQL dump
    info "Running pg_dump..."
    docker exec gitea-postgres pg_dump -U gitea -d gitea \
        > "${BASE_DIR}/postgres/dump.sql" \
        2>/dev/null || warn "pg_dump failed — archive will contain live data files only."
fi

# --- Cold backup: stop containers ---
if [[ "$ARG_COLD" == "1" ]]; then
    info "Running cold backup (stopping containers)..."
    (cd "$BASE_DIR" && docker compose down)
fi

# --- Create archive ---
info "Creating archive..."
tar czf "$BACKUP_FILE" -C / \
    "opt/${SERVICE_NAME}" \
    "opt/traefik/dynamic/${CONFIG_NAME}.yml" 2>/dev/null || \
tar czf "$BACKUP_FILE" -C / \
    "opt/${SERVICE_NAME}"

# --- Cold: restart ---
if [[ "$ARG_COLD" == "1" ]]; then
    (cd "$BASE_DIR" && docker compose up -d)
    ok "Containers restarted."
fi

# --- Clean up dump files ---
rm -f "${BASE_DIR}/gitea/data/backup/gitea-dump.tar.gz" 2>/dev/null
rm -f "${BASE_DIR}/postgres/dump.sql" 2>/dev/null

# --- Rotate old backups (keep last 5) ---
# shellcheck disable=SC2012
ls -t "${BACKUP_DIR}/backup-${SERVICE_NAME}-"*.tar.gz 2>/dev/null | tail -n +6 | xargs -r rm --

ok "Backup: ${BACKUP_FILE} ($(du -h "$BACKUP_FILE" | cut -f1))"