"""定时消费监控任务 -- 额度划拨制 + 阶梯式告警"""

import logging
from decimal import Decimal
from django.utils import timezone

logger = logging.getLogger(__name__)

_scheduler_started = False


def check_spending():
    """定时检查所有子账号消费，对比已划拨额度触发阶梯告警"""
    from apps.monitor.models import VolcAccount, IAMUser, GlobalConfig, AlertRecord, SpendingRecord
    from utils.crypto import decrypt
    from utils.billing_service import BillingService
    from utils.iam_service import IAMService
    from utils.feishu import send_feishu_alert

    config = GlobalConfig.get_solo()
    webhook = config.feishu_webhook_url

    for volc_account in VolcAccount.objects.filter(is_active=True):
        ak = decrypt(volc_account.access_key_enc)
        sk = decrypt(volc_account.secret_key_enc)
        if not ak or not sk:
            logger.warning(f"主账号 {volc_account.name} 密钥为空，跳过")
            continue

        billing = BillingService(ak, sk)
        iam_svc = IAMService(ak, sk)

        users = IAMUser.objects.filter(
            volc_account=volc_account,
            monitor_enabled=True,
        ).exclude(status=IAMUser.Status.DISABLED)

        for user in users:
            try:
                # 查询当月消费（按项目筛选）
                bill_period = timezone.now().strftime("%Y-%m")
                spending = billing.get_spending_by_project(
                    bill_period, user.project_name or None
                )

                # 记录月度快照
                SpendingRecord.objects.update_or_create(
                    iam_user=user, bill_period=bill_period,
                    defaults={'amount': spending},
                )

                # 累计消费 = 所有月份的消费之和
                from django.db.models import Sum
                total = SpendingRecord.objects.filter(
                    iam_user=user
                ).aggregate(total=Sum('amount'))['total'] or Decimal('0')

                user.consumed_total = total
                user.spending_updated_at = timezone.now()

                quota = user.allocated_quota
                if not quota or quota <= 0:
                    user.save(update_fields=['consumed_total', 'spending_updated_at'])
                    continue

                usage_percent = float(total) / float(quota) * 100
                triggered = user.triggered_alerts or []

                # --- 阶梯式告警 ---
                for step in user.get_alert_thresholds():
                    if usage_percent >= step and step not in triggered:
                        triggered.append(step)
                        threshold_amount = Decimal(str(quota)) * step / 100

                        AlertRecord.objects.create(
                            iam_user=user,
                            alert_type=AlertRecord.AlertType.WARNING,
                            title=f"{user.username} 消费达到额度 {step}%",
                            content=(
                                f"累计消费 ¥{total:.2f}，"
                                f"已划拨额度 ¥{quota:.2f} 的 {step}%\n"
                                f"剩余额度: ¥{user.remaining_quota:.2f}"
                            ),
                            spending_amount=total,
                            threshold_amount=threshold_amount,
                            notified=True,
                        )
                        send_feishu_alert(
                            webhook,
                            f"⚠️ {user.username} 消费达到额度 {step}%",
                            f"**用户**: {user.username}\n"
                            f"**累计消费**: ¥{total:.2f}\n"
                            f"**已划拨额度**: ¥{quota:.2f}\n"
                            f"**剩余额度**: ¥{user.remaining_quota:.2f}\n"
                            f"**使用率**: {usage_percent:.1f}%",
                            template="orange" if step < 90 else "red",
                        )

                # --- 额度用尽，自动停用 ---
                if (usage_percent >= 100
                        and user.auto_disable_enabled
                        and 100 not in triggered):
                    triggered.append(100)

                    try:
                        iam_svc.disable_user(user.username)
                        user.status = IAMUser.Status.DISABLED
                    except Exception as e:
                        logger.error(f"停用用户 {user.username} 失败: {e}")

                    AlertRecord.objects.create(
                        iam_user=user,
                        alert_type=AlertRecord.AlertType.DISABLE,
                        title=f"{user.username} 额度用尽，已自动停用",
                        content=(
                            f"累计消费 ¥{total:.2f}，已划拨额度 ¥{quota:.2f} 已用尽。\n"
                            f"如需继续使用，请划拨新额度后恢复账号。"
                        ),
                        spending_amount=total,
                        threshold_amount=quota,
                        notified=True,
                    )
                    send_feishu_alert(
                        webhook,
                        f"🚨 {user.username} 额度用尽，已自动停用",
                        f"**用户**: {user.username}\n"
                        f"**累计消费**: ¥{total:.2f}\n"
                        f"**已划拨额度**: ¥{quota:.2f}\n"
                        f"额度已用尽，账号已自动停用。\n"
                        f"请在 AirGate 划拨新额度后恢复。",
                        template="red",
                    )

                user.triggered_alerts = triggered
                user.save(update_fields=[
                    'consumed_total', 'spending_updated_at',
                    'triggered_alerts', 'status',
                ])

            except Exception as e:
                logger.error(f"检查用户 {user.username} 消费失败: {e}")


def start_scheduler():
    """启动定时任务"""
    global _scheduler_started
    if _scheduler_started:
        return
    _scheduler_started = True

    try:
        from apscheduler.schedulers.background import BackgroundScheduler
        from apps.monitor.models import GlobalConfig

        scheduler = BackgroundScheduler()
        config = GlobalConfig.get_solo()
        interval = config.monitor_interval_seconds or 3600
        scheduler.add_job(check_spending, 'interval', seconds=interval,
                          id='check_spending', replace_existing=True)
        scheduler.start()
        logger.info(f"消费监控定时任务已启动，间隔 {interval} 秒")
    except Exception as e:
        logger.error(f"启动定时任务失败: {e}")