from rest_framework import serializers
from .models import AIAgent, AIOperationLog, AITask, AIWebhook


class AIAgentSerializer(serializers.ModelSerializer):
    """AI 代理序列化器"""
    
    permissions = serializers.ListField(
        child=serializers.CharField(),
        required=False
    )
    
    class Meta:
        model = AIAgent
        fields = [
            'id', 'agent_id', 'name', 'description', 'permissions',
            'rate_limit', 'rate_limit_window', 'is_active', 'last_seen',
            'created_at', 'updated_at'
        ]
        read_only_fields = ['id', 'created_at', 'updated_at', 'last_seen']
        extra_kwargs = {
            'secret_key': {'write_only': True}
        }


class AIAgentAuthSerializer(serializers.Serializer):
    """AI 代理认证序列化器"""
    
    agent_id = serializers.CharField()
    agent_secret = serializers.CharField()
    
    def validate(self, data):
        try:
            agent = AIAgent.objects.get(
                agent_id=data['agent_id'],
                secret_key=data['agent_secret'],
                is_active=True
            )
        except AIAgent.DoesNotExist:
            raise serializers.ValidationError("Invalid agent credentials")
        
        # 更新最后活跃时间
        from django.utils import timezone
        agent.last_seen = timezone.now()
        agent.save()
        
        self.instance = agent
        return data


class AIOperationLogSerializer(serializers.ModelSerializer):
    """AI 操作日志序列化器"""
    
    agent_id = serializers.CharField(source='agent.agent_id', read_only=True)
    agent_name = serializers.CharField(source='agent.name', read_only=True)
    
    class Meta:
        model = AIOperationLog
        fields = [
            'id', 'agent_id', 'agent_name', 'action', 'resource_type',
            'resource_id', 'status', 'confidence', 'reasoning',
            'execution_time_ms', 'created_at'
        ]
        read_only_fields = ['id', 'created_at']


class AITaskSerializer(serializers.ModelSerializer):
    """AI 任务序列化器"""
    
    agent_id = serializers.CharField(source='agent.agent_id', read_only=True)
    
    class Meta:
        model = AITask
        fields = [
            'id', 'task_id', 'agent_id', 'task_type', 'status',
            'progress', 'processed_items', 'total_items', 'result',
            'error_message', 'callback_url', 'created_at', 'started_at', 'completed_at'
        ]
        read_only_fields = ['id', 'created_at', 'started_at', 'completed_at']


class AITaskCreateSerializer(serializers.Serializer):
    """AI 任务创建序列化器"""
    
    task_type = serializers.CharField()
    operations = serializers.ListField(required=False)
    callback_url = serializers.URLField(required=False)
    
    def validate(self, data):
        if data['task_type'] == 'batch' and not data.get('operations'):
            raise serializers.ValidationError("Batch task requires operations")
        return data


class AIWebhookSerializer(serializers.ModelSerializer):
    """AI Webhook 序列化器"""
    
    agent_id = serializers.CharField(source='agent.agent_id', read_only=True)
    
    class Meta:
        model = AIWebhook
        fields = [
            'id', 'agent_id', 'event', 'url', 'is_active',
            'last_triggered', 'failure_count', 'created_at'
        ]
        read_only_fields = ['id', 'created_at', 'last_triggered', 'failure_count']
        extra_kwargs = {
            'secret': {'write_only': True}
        }


class BatchOperationSerializer(serializers.Serializer):
    """批量操作序列化器"""
    
    operations = serializers.ListField(
        child=serializers.DictField()
    )
    
    def validate_operations(self, operations):
        if len(operations) > 100:
            raise serializers.ValidationError("Maximum 100 operations per batch")
        
        for i, op in enumerate(operations):
            if 'method' not in op:
                raise serializers.ValidationError(f"Operation {i}: missing 'method'")
            if op['method'] not in ['GET', 'POST', 'PUT', 'PATCH', 'DELETE']:
                raise serializers.ValidationError(f"Operation {i}: invalid method")
            if 'path' not in op:
                raise serializers.ValidationError(f"Operation {i}: missing 'path'")
        
        return operations