#!/bin/bash

# 数据库备份脚本
# 使用方法: ./scripts/backup.sh

set -e

# 配置变量
DB_HOST="${DB_HOST:-localhost}"
DB_NAME="${DB_NAME:-photography}"
DB_USER="${DB_USER:-postgres}"
BACKUP_DIR="/home/gitea/backups/database"
DATE=$(date +%Y%m%d-%H%M%S)

echo "🗄️ 开始数据库备份..."

# 创建备份目录
mkdir -p "$BACKUP_DIR"

# 检查数据库连接
echo "🔍 检查数据库连接..."
if ! pg_isready -h "$DB_HOST" -U "$DB_USER" -d "$DB_NAME"; then
    echo "❌ 数据库连接失败"
    exit 1
fi

# 执行备份
echo "📦 执行数据库备份..."
pg_dump -h "$DB_HOST" -U "$DB_USER" -d "$DB_NAME" \
    --no-password --verbose --clean --no-acl --no-owner \
    -f "$BACKUP_DIR/photography-$DATE.sql"

# 检查备份文件
if [ ! -f "$BACKUP_DIR/photography-$DATE.sql" ]; then
    echo "❌ 备份文件创建失败"
    exit 1
fi

# 压缩备份文件
echo "🗜️ 压缩备份文件..."
gzip "$BACKUP_DIR/photography-$DATE.sql"

# 检查压缩文件
if [ ! -f "$BACKUP_DIR/photography-$DATE.sql.gz" ]; then
    echo "❌ 备份文件压缩失败"
    exit 1
fi

# 设置权限
chmod 600 "$BACKUP_DIR/photography-$DATE.sql.gz"
chown gitea:gitea "$BACKUP_DIR/photography-$DATE.sql.gz"

# 清理旧备份 (保留最近7天)
echo "🧹 清理旧备份..."
find "$BACKUP_DIR" -name "photography-*.sql.gz" -mtime +7 -delete

echo "✅ 数据库备份完成!"
echo "📁 备份文件: $BACKUP_DIR/photography-$DATE.sql.gz"
echo "📊 文件大小: $(du -sh $BACKUP_DIR/photography-$DATE.sql.gz | cut -f1)"

# 显示备份统计
echo "📈 备份统计:"
echo "  总备份数: $(ls -1 $BACKUP_DIR/photography-*.sql.gz | wc -l)"
echo "  总备份大小: $(du -sh $BACKUP_DIR | cut -f1)"
echo "  最新备份: $(ls -t $BACKUP_DIR/photography-*.sql.gz | head -n 1)"