from rest_framework import serializers
from .models import IAMUser, VolcAccount, GlobalConfig, AlertRecord, SpendingRecord, QuotaAllocation


class VolcAccountSerializer(serializers.ModelSerializer):
    class Meta:
        model = VolcAccount
        fields = ['id', 'name', 'access_key_hint', 'is_active', 'created_at', 'updated_at']
        read_only_fields = ['access_key_hint', 'created_at', 'updated_at']


class VolcAccountCreateSerializer(serializers.Serializer):
    name = serializers.CharField(max_length=100, default='默认主账号')
    access_key = serializers.CharField(write_only=True)
    secret_key = serializers.CharField(write_only=True)


class IAMUserSerializer(serializers.ModelSerializer):
    remaining_quota = serializers.DecimalField(max_digits=12, decimal_places=2, read_only=True)
    usage_percent = serializers.FloatField(read_only=True)
    effective_alert_thresholds = serializers.SerializerMethodField()

    class Meta:
        model = IAMUser
        fields = [
            'id', 'username', 'display_name', 'user_id', 'email', 'phone',
            'project_name', 'status', 'access_key_ids',
            'allocated_quota', 'consumed_total', 'remaining_quota', 'usage_percent',
            'spending_updated_at',
            'monitor_enabled', 'auto_disable_enabled',
            'alert_thresholds', 'triggered_alerts',
            'effective_alert_thresholds',
            'remark', 'created_at', 'updated_at',
        ]
        read_only_fields = ['user_id', 'access_key_ids', 'status',
                            'consumed_total', 'spending_updated_at',
                            'triggered_alerts',
                            'created_at', 'updated_at']

    def get_effective_alert_thresholds(self, obj):
        return obj.get_alert_thresholds()


class IAMUserCreateSerializer(serializers.Serializer):
    username = serializers.CharField(max_length=200)
    display_name = serializers.CharField(max_length=200, required=False, default='')
    email = serializers.EmailField(required=False, default='')
    phone = serializers.CharField(max_length=20, required=False, default='')
    password = serializers.CharField(write_only=True, required=False, default='')
    project_name = serializers.CharField(max_length=200, required=False, default='')


class IAMUserImportSerializer(serializers.Serializer):
    username = serializers.CharField(max_length=200, help_text='已存在的 IAM 用户名')


class IAMUserConfigSerializer(serializers.Serializer):
    """子账号配置更新"""
    project_name = serializers.CharField(max_length=200, required=False, allow_blank=True)
    alert_thresholds = serializers.ListField(
        child=serializers.IntegerField(min_value=1, max_value=99),
        required=False,
    )
    monitor_enabled = serializers.BooleanField(required=False)
    auto_disable_enabled = serializers.BooleanField(required=False)


class QuotaAllocateSerializer(serializers.Serializer):
    """额度变更：正数=追加，负数=扣减"""
    amount = serializers.DecimalField(max_digits=12, decimal_places=2)
    note = serializers.CharField(max_length=500, required=False, default='')

    def validate_amount(self, value):
        from decimal import Decimal
        if value == Decimal('0'):
            raise serializers.ValidationError('变更金额不能为 0')
        return value


class QuotaAllocationSerializer(serializers.ModelSerializer):
    class Meta:
        model = QuotaAllocation
        fields = ['id', 'amount', 'total_after', 'note', 'created_by', 'created_at']


class GlobalConfigSerializer(serializers.ModelSerializer):
    class Meta:
        model = GlobalConfig
        fields = [
            'default_alert_thresholds',
            'monitor_interval_seconds',
            'feishu_webhook_url', 'feishu_alert_mobiles',
            'updated_at',
        ]
        read_only_fields = ['updated_at']


class AlertRecordSerializer(serializers.ModelSerializer):
    iam_username = serializers.CharField(source='iam_user.username', default='')

    class Meta:
        model = AlertRecord
        fields = [
            'id', 'iam_user', 'iam_username', 'alert_type', 'title', 'content',
            'spending_amount', 'threshold_amount', 'notified', 'created_at',
        ]


class SpendingRecordSerializer(serializers.ModelSerializer):
    iam_username = serializers.CharField(source='iam_user.username')

    class Meta:
        model = SpendingRecord
        fields = ['id', 'iam_user', 'iam_username', 'bill_period', 'amount', 'updated_at']


class DashboardSerializer(serializers.Serializer):
    total_users = serializers.IntegerField()
    active_users = serializers.IntegerField()
    disabled_users = serializers.IntegerField()
    monitored_users = serializers.IntegerField()
    total_spending = serializers.DecimalField(max_digits=12, decimal_places=2)
    recent_alerts = AlertRecordSerializer(many=True)